(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
  module.exports = after
  
  function after(count, callback, err_cb) {
      var bail = false
      err_cb = err_cb || noop
      proxy.count = count
  
      return (count === 0) ? callback() : proxy
  
      function proxy(err, result) {
          if (proxy.count <= 0) {
              throw new Error('after called too many times')
          }
          --proxy.count
  
          // after first error, rest are passed to err_cb
          if (err) {
              bail = true
              callback(err)
              // future error callbacks will go to error handler
              callback = err_cb
          } else if (proxy.count === 0 && !bail) {
              callback(null, result)
          }
      }
  }
  
  function noop() {}
  
  },{}],2:[function(require,module,exports){
  /**
   * An abstraction for slicing an arraybuffer even when
   * ArrayBuffer.prototype.slice is not supported
   *
   * @api public
   */
  
  module.exports = function(arraybuffer, start, end) {
    var bytes = arraybuffer.byteLength;
    start = start || 0;
    end = end || bytes;
  
    if (arraybuffer.slice) { return arraybuffer.slice(start, end); }
  
    if (start < 0) { start += bytes; }
    if (end < 0) { end += bytes; }
    if (end > bytes) { end = bytes; }
  
    if (start >= bytes || start >= end || bytes === 0) {
      return new ArrayBuffer(0);
    }
  
    var abv = new Uint8Array(arraybuffer);
    var result = new Uint8Array(end - start);
    for (var i = start, ii = 0; i < end; i++, ii++) {
      result[ii] = abv[i];
    }
    return result.buffer;
  };
  
  },{}],3:[function(require,module,exports){
  "use strict";
  var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
      function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
      return new (P || (P = Promise))(function (resolve, reject) {
          function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
          function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
          function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
          step((generator = generator.apply(thisArg, _arguments || [])).next());
      });
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  class AwaitQueue {
      constructor({ ClosedErrorClass = Error, StoppedErrorClass = Error, RemovedTaskErrorClass = Error } = {
          ClosedErrorClass: Error,
          StoppedErrorClass: Error,
          RemovedTaskErrorClass: Error
      }) {
          // Closed flag.
          this.closed = false;
          // Queue of pending tasks.
          this.pendingTasks = [];
          // Error class used when rejecting a task due to AwaitQueue being closed.
          this.ClosedErrorClass = Error;
          // Error class used when rejecting a task due to AwaitQueue being stopped.
          this.StoppedErrorClass = Error;
          // Error class used when removing a pending task when calling removeTask().
          this.RemovedTaskErrorClass = Error;
          this.ClosedErrorClass = ClosedErrorClass;
          this.StoppedErrorClass = StoppedErrorClass;
          this.RemovedTaskErrorClass = RemovedTaskErrorClass;
      }
      get size() {
          return this.pendingTasks.length;
      }
      close() {
          if (this.closed)
              return;
          this.closed = true;
          for (const pendingTask of this.pendingTasks) {
              pendingTask.stopped = true;
              pendingTask.reject(new this.ClosedErrorClass('AwaitQueue closed'));
          }
          // Enpty the pending tasks array.
          this.pendingTasks.length = 0;
      }
      push(task, name) {
          return __awaiter(this, void 0, void 0, function* () {
              if (this.closed)
                  throw new this.ClosedErrorClass('AwaitQueue closed');
              if (typeof task !== 'function')
                  throw new TypeError('given task is not a function');
              if (!task.name && name) {
                  try {
                      Object.defineProperty(task, 'name', { value: name });
                  }
                  catch (error) { }
              }
              return new Promise((resolve, reject) => {
                  const pendingTask = {
                      task,
                      name,
                      resolve,
                      reject,
                      stopped: false,
                      enqueuedAt: new Date(),
                      executedAt: undefined
                  };
                  // Append task to the queue.
                  this.pendingTasks.push(pendingTask);
                  // And run it if this is the only task in the queue.
                  if (this.pendingTasks.length === 1)
                      this.next();
              });
          });
      }
      removeTask(idx) {
          if (idx === 0) {
              throw new TypeError('cannot remove task with index 0');
          }
          const pendingTask = this.pendingTasks[idx];
          if (!pendingTask)
              return;
          this.pendingTasks.splice(idx, 1);
          pendingTask.reject(new this.RemovedTaskErrorClass('task removed from the queue'));
      }
      stop() {
          if (this.closed)
              return;
          for (const pendingTask of this.pendingTasks) {
              pendingTask.stopped = true;
              pendingTask.reject(new this.StoppedErrorClass('AwaitQueue stopped'));
          }
          // Enpty the pending tasks array.
          this.pendingTasks.length = 0;
      }
      dump() {
          const now = new Date();
          let idx = 0;
          return this.pendingTasks.map((pendingTask) => ({
              idx: idx++,
              task: pendingTask.task,
              name: pendingTask.name,
              enqueuedTime: pendingTask.executedAt
                  ? pendingTask.executedAt.getTime() - pendingTask.enqueuedAt.getTime()
                  : now.getTime() - pendingTask.enqueuedAt.getTime(),
              executingTime: pendingTask.executedAt
                  ? now.getTime() - pendingTask.executedAt.getTime()
                  : 0
          }));
      }
      next() {
          return __awaiter(this, void 0, void 0, function* () {
              // Take the first pending task.
              const pendingTask = this.pendingTasks[0];
              if (!pendingTask)
                  return;
              // Execute it.
              yield this.executeTask(pendingTask);
              // Remove the first pending task (the completed one) from the queue.
              this.pendingTasks.shift();
              // And continue.
              this.next();
          });
      }
      executeTask(pendingTask) {
          return __awaiter(this, void 0, void 0, function* () {
              // If the task is stopped, ignore it.
              if (pendingTask.stopped)
                  return;
              pendingTask.executedAt = new Date();
              try {
                  const result = yield pendingTask.task();
                  // If the task is stopped, ignore it.
                  if (pendingTask.stopped)
                      return;
                  // Resolve the task with the returned result (if any).
                  pendingTask.resolve(result);
              }
              catch (error) {
                  // If the task is stopped, ignore it.
                  if (pendingTask.stopped)
                      return;
                  // Reject the task with its own error.
                  pendingTask.reject(error);
              }
          });
      }
  }
  exports.AwaitQueue = AwaitQueue;
  
  },{}],4:[function(require,module,exports){
  
  /**
   * Expose `Backoff`.
   */
  
  module.exports = Backoff;
  
  /**
   * Initialize backoff timer with `opts`.
   *
   * - `min` initial timeout in milliseconds [100]
   * - `max` max timeout [10000]
   * - `jitter` [0]
   * - `factor` [2]
   *
   * @param {Object} opts
   * @api public
   */
  
  function Backoff(opts) {
    opts = opts || {};
    this.ms = opts.min || 100;
    this.max = opts.max || 10000;
    this.factor = opts.factor || 2;
    this.jitter = opts.jitter > 0 && opts.jitter <= 1 ? opts.jitter : 0;
    this.attempts = 0;
  }
  
  /**
   * Return the backoff duration.
   *
   * @return {Number}
   * @api public
   */
  
  Backoff.prototype.duration = function(){
    var ms = this.ms * Math.pow(this.factor, this.attempts++);
    if (this.jitter) {
      var rand =  Math.random();
      var deviation = Math.floor(rand * this.jitter * ms);
      ms = (Math.floor(rand * 10) & 1) == 0  ? ms - deviation : ms + deviation;
    }
    return Math.min(ms, this.max) | 0;
  };
  
  /**
   * Reset the number of attempts.
   *
   * @api public
   */
  
  Backoff.prototype.reset = function(){
    this.attempts = 0;
  };
  
  /**
   * Set the minimum duration
   *
   * @api public
   */
  
  Backoff.prototype.setMin = function(min){
    this.ms = min;
  };
  
  /**
   * Set the maximum duration
   *
   * @api public
   */
  
  Backoff.prototype.setMax = function(max){
    this.max = max;
  };
  
  /**
   * Set the jitter
   *
   * @api public
   */
  
  Backoff.prototype.setJitter = function(jitter){
    this.jitter = jitter;
  };
  
  
  },{}],5:[function(require,module,exports){
  /*
   * base64-arraybuffer
   * https://github.com/niklasvh/base64-arraybuffer
   *
   * Copyright (c) 2012 Niklas von Hertzen
   * Licensed under the MIT license.
   */
  (function(chars){
    "use strict";
  
    exports.encode = function(arraybuffer) {
      var bytes = new Uint8Array(arraybuffer),
      i, len = bytes.length, base64 = "";
  
      for (i = 0; i < len; i+=3) {
        base64 += chars[bytes[i] >> 2];
        base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
        base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
        base64 += chars[bytes[i + 2] & 63];
      }
  
      if ((len % 3) === 2) {
        base64 = base64.substring(0, base64.length - 1) + "=";
      } else if (len % 3 === 1) {
        base64 = base64.substring(0, base64.length - 2) + "==";
      }
  
      return base64;
    };
  
    exports.decode =  function(base64) {
      var bufferLength = base64.length * 0.75,
      len = base64.length, i, p = 0,
      encoded1, encoded2, encoded3, encoded4;
  
      if (base64[base64.length - 1] === "=") {
        bufferLength--;
        if (base64[base64.length - 2] === "=") {
          bufferLength--;
        }
      }
  
      var arraybuffer = new ArrayBuffer(bufferLength),
      bytes = new Uint8Array(arraybuffer);
  
      for (i = 0; i < len; i+=4) {
        encoded1 = chars.indexOf(base64[i]);
        encoded2 = chars.indexOf(base64[i+1]);
        encoded3 = chars.indexOf(base64[i+2]);
        encoded4 = chars.indexOf(base64[i+3]);
  
        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
      }
  
      return arraybuffer;
    };
  })("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
  
  },{}],6:[function(require,module,exports){
  'use strict'
  
  exports.byteLength = byteLength
  exports.toByteArray = toByteArray
  exports.fromByteArray = fromByteArray
  
  var lookup = []
  var revLookup = []
  var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
  
  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
  for (var i = 0, len = code.length; i < len; ++i) {
    lookup[i] = code[i]
    revLookup[code.charCodeAt(i)] = i
  }
  
  // Support decoding URL-safe base64 strings, as Node.js does.
  // See: https://en.wikipedia.org/wiki/Base64#URL_applications
  revLookup['-'.charCodeAt(0)] = 62
  revLookup['_'.charCodeAt(0)] = 63
  
  function getLens (b64) {
    var len = b64.length
  
    if (len % 4 > 0) {
      throw new Error('Invalid string. Length must be a multiple of 4')
    }
  
    // Trim off extra bytes after placeholder bytes are found
    // See: https://github.com/beatgammit/base64-js/issues/42
    var validLen = b64.indexOf('=')
    if (validLen === -1) validLen = len
  
    var placeHoldersLen = validLen === len
      ? 0
      : 4 - (validLen % 4)
  
    return [validLen, placeHoldersLen]
  }
  
  // base64 is 4/3 + up to two characters of the original data
  function byteLength (b64) {
    var lens = getLens(b64)
    var validLen = lens[0]
    var placeHoldersLen = lens[1]
    return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
  }
  
  function _byteLength (b64, validLen, placeHoldersLen) {
    return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
  }
  
  function toByteArray (b64) {
    var tmp
    var lens = getLens(b64)
    var validLen = lens[0]
    var placeHoldersLen = lens[1]
  
    var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))
  
    var curByte = 0
  
    // if there are placeholders, only get up to the last complete 4 chars
    var len = placeHoldersLen > 0
      ? validLen - 4
      : validLen
  
    var i
    for (i = 0; i < len; i += 4) {
      tmp =
        (revLookup[b64.charCodeAt(i)] << 18) |
        (revLookup[b64.charCodeAt(i + 1)] << 12) |
        (revLookup[b64.charCodeAt(i + 2)] << 6) |
        revLookup[b64.charCodeAt(i + 3)]
      arr[curByte++] = (tmp >> 16) & 0xFF
      arr[curByte++] = (tmp >> 8) & 0xFF
      arr[curByte++] = tmp & 0xFF
    }
  
    if (placeHoldersLen === 2) {
      tmp =
        (revLookup[b64.charCodeAt(i)] << 2) |
        (revLookup[b64.charCodeAt(i + 1)] >> 4)
      arr[curByte++] = tmp & 0xFF
    }
  
    if (placeHoldersLen === 1) {
      tmp =
        (revLookup[b64.charCodeAt(i)] << 10) |
        (revLookup[b64.charCodeAt(i + 1)] << 4) |
        (revLookup[b64.charCodeAt(i + 2)] >> 2)
      arr[curByte++] = (tmp >> 8) & 0xFF
      arr[curByte++] = tmp & 0xFF
    }
  
    return arr
  }
  
  function tripletToBase64 (num) {
    return lookup[num >> 18 & 0x3F] +
      lookup[num >> 12 & 0x3F] +
      lookup[num >> 6 & 0x3F] +
      lookup[num & 0x3F]
  }
  
  function encodeChunk (uint8, start, end) {
    var tmp
    var output = []
    for (var i = start; i < end; i += 3) {
      tmp =
        ((uint8[i] << 16) & 0xFF0000) +
        ((uint8[i + 1] << 8) & 0xFF00) +
        (uint8[i + 2] & 0xFF)
      output.push(tripletToBase64(tmp))
    }
    return output.join('')
  }
  
  function fromByteArray (uint8) {
    var tmp
    var len = uint8.length
    var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
    var parts = []
    var maxChunkLength = 16383 // must be multiple of 3
  
    // go through the array every three bytes, we'll deal with trailing stuff later
    for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
      parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
    }
  
    // pad the end with zeros, but make sure to not forget the extra bytes
    if (extraBytes === 1) {
      tmp = uint8[len - 1]
      parts.push(
        lookup[tmp >> 2] +
        lookup[(tmp << 4) & 0x3F] +
        '=='
      )
    } else if (extraBytes === 2) {
      tmp = (uint8[len - 2] << 8) + uint8[len - 1]
      parts.push(
        lookup[tmp >> 10] +
        lookup[(tmp >> 4) & 0x3F] +
        lookup[(tmp << 2) & 0x3F] +
        '='
      )
    }
  
    return parts.join('')
  }
  
  },{}],7:[function(require,module,exports){
  /**
   * Create a blob builder even when vendor prefixes exist
   */
  
  var BlobBuilder = typeof BlobBuilder !== 'undefined' ? BlobBuilder :
    typeof WebKitBlobBuilder !== 'undefined' ? WebKitBlobBuilder :
    typeof MSBlobBuilder !== 'undefined' ? MSBlobBuilder :
    typeof MozBlobBuilder !== 'undefined' ? MozBlobBuilder : 
    false;
  
  /**
   * Check if Blob constructor is supported
   */
  
  var blobSupported = (function() {
    try {
      var a = new Blob(['hi']);
      return a.size === 2;
    } catch(e) {
      return false;
    }
  })();
  
  /**
   * Check if Blob constructor supports ArrayBufferViews
   * Fails in Safari 6, so we need to map to ArrayBuffers there.
   */
  
  var blobSupportsArrayBufferView = blobSupported && (function() {
    try {
      var b = new Blob([new Uint8Array([1,2])]);
      return b.size === 2;
    } catch(e) {
      return false;
    }
  })();
  
  /**
   * Check if BlobBuilder is supported
   */
  
  var blobBuilderSupported = BlobBuilder
    && BlobBuilder.prototype.append
    && BlobBuilder.prototype.getBlob;
  
  /**
   * Helper function that maps ArrayBufferViews to ArrayBuffers
   * Used by BlobBuilder constructor and old browsers that didn't
   * support it in the Blob constructor.
   */
  
  function mapArrayBufferViews(ary) {
    return ary.map(function(chunk) {
      if (chunk.buffer instanceof ArrayBuffer) {
        var buf = chunk.buffer;
  
        // if this is a subarray, make a copy so we only
        // include the subarray region from the underlying buffer
        if (chunk.byteLength !== buf.byteLength) {
          var copy = new Uint8Array(chunk.byteLength);
          copy.set(new Uint8Array(buf, chunk.byteOffset, chunk.byteLength));
          buf = copy.buffer;
        }
  
        return buf;
      }
  
      return chunk;
    });
  }
  
  function BlobBuilderConstructor(ary, options) {
    options = options || {};
  
    var bb = new BlobBuilder();
    mapArrayBufferViews(ary).forEach(function(part) {
      bb.append(part);
    });
  
    return (options.type) ? bb.getBlob(options.type) : bb.getBlob();
  };
  
  function BlobConstructor(ary, options) {
    return new Blob(mapArrayBufferViews(ary), options || {});
  };
  
  if (typeof Blob !== 'undefined') {
    BlobBuilderConstructor.prototype = Blob.prototype;
    BlobConstructor.prototype = Blob.prototype;
  }
  
  module.exports = (function() {
    if (blobSupported) {
      return blobSupportsArrayBufferView ? Blob : BlobConstructor;
    } else if (blobBuilderSupported) {
      return BlobBuilderConstructor;
    } else {
      return undefined;
    }
  })();
  
  },{}],8:[function(require,module,exports){
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r&&(t.version=r),t}},{test:[/chromium/i],describe:function(e){var t={name:"Chromium"},r=i.default.getFirstMatch(/(?:chromium)[\s/](\d+(\.?_?\d+)+)/i,e)||i.default.getFirstMatch(s,e);return r&&(t.version=r),t}},{test:[/chrome|crios|crmo/i],describe:function(e){var t={name:"Chrome"},r=i.default.getFirstMatch(/(?:chrome|crios|crmo)\/(\d+(\.?_?\d+)+)/i,e);return r&&(t.version=r),t}},{test:[/GSA/i],describe:function(e){var t={name:"Google Search"},r=i.default.getFirstMatch(/(?:GSA)\/(\d+(\.?_?\d+)+)/i,e);return r&&(t.version=r),t}},{test:function(e){var t=!e.test(/like android/i),r=e.test(/android/i);return t&&r},describe:function(e){var t={name:"Android Browser"},r=i.default.getFirstMatch(s,e);return r&&(t.version=r),t}},{test:[/playstation 4/i],describe:function(e){var t={name:"PlayStation 4"},r=i.default.getFirstMatch(s,e);return r&&(t.version=r),t}},{test:[/safari|applewebkit/i],describe:function(e){var t={name:"Safari"},r=i.default.getFirstMatch(s,e);return r&&(t.version=r),t}},{test:[/.*/i],describe:function(e){var t=-1!==e.search("\\(")?/^(.*)\/(.*)[ \t]\((.*)/:/^(.*)\/(.*) /;return{name:i.default.getFirstMatch(t,e),version:i.default.getSecondMatch(t,e)}}}];t.default=a,e.exports=t.default},93:function(e,t,r){"use strict";t.__esModule=!0,t.default=void 0;var n,i=(n=r(17))&&n.__esModule?n:{default:n},s=r(18);var a=[{test:[/Roku\/DVP/],describe:function(e){var t=i.default.getFirstMatch(/Roku\/DVP-(\d+\.\d+)/i,e);return{name:s.OS_MAP.Roku,version:t}}},{test:[/windows phone/i],describe:function(e){var t=i.default.getFirstMatch(/windows phone (?:os)?\s?(\d+(\.\d+)*)/i,e);return{name:s.OS_MAP.WindowsPhone,version:t}}},{test:[/windows /i],describe:function(e){var t=i.default.getFirstMatch(/Windows ((NT|XP)( \d\d?.\d)?)/i,e),r=i.default.getWindowsVersionName(t);return{name:s.OS_MAP.Windows,version:t,versionName:r}}},{test:[/Macintosh(.*?) FxiOS(.*?)\//],describe:function(e){var t={name:s.OS_MAP.iOS},r=i.default.getSecondMatch(/(Version\/)(\d[\d.]+)/,e);return r&&(t.version=r),t}},{test:[/macintosh/i],describe:function(e){var t=i.default.getFirstMatch(/mac os x (\d+(\.?_?\d+)+)/i,e).replace(/[_\s]/g,"."),r=i.default.getMacOSVersionName(t),n={name:s.OS_MAP.MacOS,version:t};return r&&(n.versionName=r),n}},{test:[/(ipod|iphone|ipad)/i],describe:function(e){var t=i.default.getFirstMatch(/os (\d+([_\s]\d+)*) like mac os x/i,e).replace(/[_\s]/g,".");return{name:s.OS_MAP.iOS,version:t}}},{test:function(e){var t=!e.test(/like android/i),r=e.test(/android/i);return t&&r},describe:function(e){var t=i.default.getFirstMatch(/android[\s/-](\d+(\.\d+)*)/i,e),r=i.default.getAndroidVersionName(t),n={name:s.OS_MAP.Android,version:t};return r&&(n.versionName=r),n}},{test:[/(web|hpw)[o0]s/i],describe:function(e){var t=i.default.getFirstMatch(/(?:web|hpw)[o0]s\/(\d+(\.\d+)*)/i,e),r={name:s.OS_MAP.WebOS};return t&&t.length&&(r.version=t),r}},{test:[/blackberry|\bbb\d+/i,/rim\stablet/i],describe:function(e){var t=i.default.getFirstMatch(/rim\stablet\sos\s(\d+(\.\d+)*)/i,e)||i.default.getFirstMatch(/blackberry\d+\/(\d+([_\s]\d+)*)/i,e)||i.default.getFirstMatch(/\bbb(\d+)/i,e);return{name:s.OS_MAP.BlackBerry,version:t}}},{test:[/bada/i],describe:function(e){var t=i.default.getFirstMatch(/bada\/(\d+(\.\d+)*)/i,e);return{name:s.OS_MAP.Bada,version:t}}},{test:[/tizen/i],describe:function(e){var t=i.default.getFirstMatch(/tizen[/\s](\d+(\.\d+)*)/i,e);return{name:s.OS_MAP.Tizen,version:t}}},{test:[/linux/i],describe:function(){return{name:s.OS_MAP.Linux}}},{test:[/CrOS/],describe:function(){return{name:s.OS_MAP.ChromeOS}}},{test:[/PlayStation 4/],describe:function(e){var t=i.default.getFirstMatch(/PlayStation 4[/\s](\d+(\.\d+)*)/i,e);return{name:s.OS_MAP.PlayStation4,version:t}}}];t.default=a,e.exports=t.default},94:function(e,t,r){"use strict";t.__esModule=!0,t.default=void 0;var n,i=(n=r(17))&&n.__esModule?n:{default:n},s=r(18);var a=[{test:[/googlebot/i],describe:function(){return{type:"bot",vendor:"Google"}}},{test:[/huawei/i],describe:function(e){var t=i.default.getFirstMatch(/(can-l01)/i,e)&&"Nova",r={type:s.PLATFORMS_MAP.mobile,vendor:"Huawei"};return t&&(r.model=t),r}},{test:[/nexus\s*(?:7|8|9|10).*/i],describe:function(){return{type:s.PLATFORMS_MAP.tablet,vendor:"Nexus"}}},{test:[/ipad/i],describe:function(){return{type:s.PLATFORMS_MAP.tablet,vendor:"Apple",model:"iPad"}}},{test:[/Macintosh(.*?) FxiOS(.*?)\//],describe:function(){return{type:s.PLATFORMS_MAP.tablet,vendor:"Apple",model:"iPad"}}},{test:[/kftt build/i],describe:function(){return{type:s.PLATFORMS_MAP.tablet,vendor:"Amazon",model:"Kindle Fire HD 7"}}},{test:[/silk/i],describe:function(){return{type:s.PLATFORMS_MAP.tablet,vendor:"Amazon"}}},{test:[/tablet(?! pc)/i],describe:function(){return{type:s.PLATFORMS_MAP.tablet}}},{test:function(e){var t=e.test(/ipod|iphone/i),r=e.test(/like (ipod|iphone)/i);return t&&!r},describe:function(e){var t=i.default.getFirstMatch(/(ipod|iphone)/i,e);return{type:s.PLATFORMS_MAP.mobile,vendor:"Apple",model:t}}},{test:[/nexus\s*[0-6].*/i,/galaxy nexus/i],describe:function(){return{type:s.PLATFORMS_MAP.mobile,vendor:"Nexus"}}},{test:[/[^-]mobi/i],describe:function(){return{type:s.PLATFORMS_MAP.mobile}}},{test:function(e){return"blackberry"===e.getBrowserName(!0)},describe:function(){return{type:s.PLATFORMS_MAP.mobile,vendor:"BlackBerry"}}},{test:function(e){return"bada"===e.getBrowserName(!0)},describe:function(){return{type:s.PLATFORMS_MAP.mobile}}},{test:function(e){return"windows phone"===e.getBrowserName()},describe:function(){return{type:s.PLATFORMS_MAP.mobile,vendor:"Microsoft"}}},{test:function(e){var t=Number(String(e.getOSVersion()).split(".")[0]);return"android"===e.getOSName(!0)&&t>=3},describe:function(){return{type:s.PLATFORMS_MAP.tablet}}},{test:function(e){return"android"===e.getOSName(!0)},describe:function(){return{type:s.PLATFORMS_MAP.mobile}}},{test:function(e){return"macos"===e.getOSName(!0)},describe:function(){return{type:s.PLATFORMS_MAP.desktop,vendor:"Apple"}}},{test:function(e){return"windows"===e.getOSName(!0)},describe:function(){return{type:s.PLATFORMS_MAP.desktop}}},{test:function(e){return"linux"===e.getOSName(!0)},describe:function(){return{type:s.PLATFORMS_MAP.desktop}}},{test:function(e){return"playstation 4"===e.getOSName(!0)},describe:function(){return{type:s.PLATFORMS_MAP.tv}}},{test:function(e){return"roku"===e.getOSName(!0)},describe:function(){return{type:s.PLATFORMS_MAP.tv}}}];t.default=a,e.exports=t.default},95:function(e,t,r){"use strict";t.__esModule=!0,t.default=void 0;var n,i=(n=r(17))&&n.__esModule?n:{default:n},s=r(18);var a=[{test:function(e){return"microsoft edge"===e.getBrowserName(!0)},describe:function(e){if(/\sedg\//i.test(e))return{name:s.ENGINE_MAP.Blink};var t=i.default.getFirstMatch(/edge\/(\d+(\.?_?\d+)+)/i,e);return{name:s.ENGINE_MAP.EdgeHTML,version:t}}},{test:[/trident/i],describe:function(e){var t={name:s.ENGINE_MAP.Trident},r=i.default.getFirstMatch(/trident\/(\d+(\.?_?\d+)+)/i,e);return r&&(t.version=r),t}},{test:function(e){return e.test(/presto/i)},describe:function(e){var t={name:s.ENGINE_MAP.Presto},r=i.default.getFirstMatch(/presto\/(\d+(\.?_?\d+)+)/i,e);return r&&(t.version=r),t}},{test:function(e){var t=e.test(/gecko/i),r=e.test(/like gecko/i);return t&&!r},describe:function(e){var t={name:s.ENGINE_MAP.Gecko},r=i.default.getFirstMatch(/gecko\/(\d+(\.?_?\d+)+)/i,e);return r&&(t.version=r),t}},{test:[/(apple)?webkit\/537\.36/i],describe:function(){return{name:s.ENGINE_MAP.Blink}}},{test:[/(apple)?webkit/i],describe:function(e){var t={name:s.ENGINE_MAP.WebKit},r=i.default.getFirstMatch(/webkit\/(\d+(\.?_?\d+)+)/i,e);return r&&(t.version=r),t}}];t.default=a,e.exports=t.default}})}));
  },{}],9:[function(require,module,exports){
  
  },{}],10:[function(require,module,exports){
  (function (Buffer){(function (){
  /*!
   * The buffer module from node.js, for the browser.
   *
   * @author   Feross Aboukhadijeh <https://feross.org>
   * @license  MIT
   */
  /* eslint-disable no-proto */
  
  'use strict'
  
  var base64 = require('base64-js')
  var ieee754 = require('ieee754')
  
  exports.Buffer = Buffer
  exports.SlowBuffer = SlowBuffer
  exports.INSPECT_MAX_BYTES = 50
  
  var K_MAX_LENGTH = 0x7fffffff
  exports.kMaxLength = K_MAX_LENGTH
  
  /**
   * If `Buffer.TYPED_ARRAY_SUPPORT`:
   *   === true    Use Uint8Array implementation (fastest)
   *   === false   Print warning and recommend using `buffer` v4.x which has an Object
   *               implementation (most compatible, even IE6)
   *
   * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
   * Opera 11.6+, iOS 4.2+.
   *
   * We report that the browser does not support typed arrays if the are not subclassable
   * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
   * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
   * for __proto__ and has a buggy typed array implementation.
   */
  Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()
  
  if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
      typeof console.error === 'function') {
    console.error(
      'This browser lacks typed array (Uint8Array) support which is required by ' +
      '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
    )
  }
  
  function typedArraySupport () {
    // Can typed array instances can be augmented?
    try {
      var arr = new Uint8Array(1)
      arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } }
      return arr.foo() === 42
    } catch (e) {
      return false
    }
  }
  
  Object.defineProperty(Buffer.prototype, 'parent', {
    enumerable: true,
    get: function () {
      if (!Buffer.isBuffer(this)) return undefined
      return this.buffer
    }
  })
  
  Object.defineProperty(Buffer.prototype, 'offset', {
    enumerable: true,
    get: function () {
      if (!Buffer.isBuffer(this)) return undefined
      return this.byteOffset
    }
  })
  
  function createBuffer (length) {
    if (length > K_MAX_LENGTH) {
      throw new RangeError('The value "' + length + '" is invalid for option "size"')
    }
    // Return an augmented `Uint8Array` instance
    var buf = new Uint8Array(length)
    buf.__proto__ = Buffer.prototype
    return buf
  }
  
  /**
   * The Buffer constructor returns instances of `Uint8Array` that have their
   * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
   * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
   * and the `Uint8Array` methods. Square bracket notation works as expected -- it
   * returns a single octet.
   *
   * The `Uint8Array` prototype remains unmodified.
   */
  
  function Buffer (arg, encodingOrOffset, length) {
    // Common case.
    if (typeof arg === 'number') {
      if (typeof encodingOrOffset === 'string') {
        throw new TypeError(
          'The "string" argument must be of type string. Received type number'
        )
      }
      return allocUnsafe(arg)
    }
    return from(arg, encodingOrOffset, length)
  }
  
  // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
  if (typeof Symbol !== 'undefined' && Symbol.species != null &&
      Buffer[Symbol.species] === Buffer) {
    Object.defineProperty(Buffer, Symbol.species, {
      value: null,
      configurable: true,
      enumerable: false,
      writable: false
    })
  }
  
  Buffer.poolSize = 8192 // not used by this implementation
  
  function from (value, encodingOrOffset, length) {
    if (typeof value === 'string') {
      return fromString(value, encodingOrOffset)
    }
  
    if (ArrayBuffer.isView(value)) {
      return fromArrayLike(value)
    }
  
    if (value == null) {
      throw TypeError(
        'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
        'or Array-like Object. Received type ' + (typeof value)
      )
    }
  
    if (isInstance(value, ArrayBuffer) ||
        (value && isInstance(value.buffer, ArrayBuffer))) {
      return fromArrayBuffer(value, encodingOrOffset, length)
    }
  
    if (typeof value === 'number') {
      throw new TypeError(
        'The "value" argument must not be of type number. Received type number'
      )
    }
  
    var valueOf = value.valueOf && value.valueOf()
    if (valueOf != null && valueOf !== value) {
      return Buffer.from(valueOf, encodingOrOffset, length)
    }
  
    var b = fromObject(value)
    if (b) return b
  
    if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
        typeof value[Symbol.toPrimitive] === 'function') {
      return Buffer.from(
        value[Symbol.toPrimitive]('string'), encodingOrOffset, length
      )
    }
  
    throw new TypeError(
      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
      'or Array-like Object. Received type ' + (typeof value)
    )
  }
  
  /**
   * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
   * if value is a number.
   * Buffer.from(str[, encoding])
   * Buffer.from(array)
   * Buffer.from(buffer)
   * Buffer.from(arrayBuffer[, byteOffset[, length]])
   **/
  Buffer.from = function (value, encodingOrOffset, length) {
    return from(value, encodingOrOffset, length)
  }
  
  // Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
  // https://github.com/feross/buffer/pull/148
  Buffer.prototype.__proto__ = Uint8Array.prototype
  Buffer.__proto__ = Uint8Array
  
  function assertSize (size) {
    if (typeof size !== 'number') {
      throw new TypeError('"size" argument must be of type number')
    } else if (size < 0) {
      throw new RangeError('The value "' + size + '" is invalid for option "size"')
    }
  }
  
  function alloc (size, fill, encoding) {
    assertSize(size)
    if (size <= 0) {
      return createBuffer(size)
    }
    if (fill !== undefined) {
      // Only pay attention to encoding if it's a string. This
      // prevents accidentally sending in a number that would
      // be interpretted as a start offset.
      return typeof encoding === 'string'
        ? createBuffer(size).fill(fill, encoding)
        : createBuffer(size).fill(fill)
    }
    return createBuffer(size)
  }
  
  /**
   * Creates a new filled Buffer instance.
   * alloc(size[, fill[, encoding]])
   **/
  Buffer.alloc = function (size, fill, encoding) {
    return alloc(size, fill, encoding)
  }
  
  function allocUnsafe (size) {
    assertSize(size)
    return createBuffer(size < 0 ? 0 : checked(size) | 0)
  }
  
  /**
   * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
   * */
  Buffer.allocUnsafe = function (size) {
    return allocUnsafe(size)
  }
  /**
   * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
   */
  Buffer.allocUnsafeSlow = function (size) {
    return allocUnsafe(size)
  }
  
  function fromString (string, encoding) {
    if (typeof encoding !== 'string' || encoding === '') {
      encoding = 'utf8'
    }
  
    if (!Buffer.isEncoding(encoding)) {
      throw new TypeError('Unknown encoding: ' + encoding)
    }
  
    var length = byteLength(string, encoding) | 0
    var buf = createBuffer(length)
  
    var actual = buf.write(string, encoding)
  
    if (actual !== length) {
      // Writing a hex string, for example, that contains invalid characters will
      // cause everything after the first invalid character to be ignored. (e.g.
      // 'abxxcd' will be treated as 'ab')
      buf = buf.slice(0, actual)
    }
  
    return buf
  }
  
  function fromArrayLike (array) {
    var length = array.length < 0 ? 0 : checked(array.length) | 0
    var buf = createBuffer(length)
    for (var i = 0; i < length; i += 1) {
      buf[i] = array[i] & 255
    }
    return buf
  }
  
  function fromArrayBuffer (array, byteOffset, length) {
    if (byteOffset < 0 || array.byteLength < byteOffset) {
      throw new RangeError('"offset" is outside of buffer bounds')
    }
  
    if (array.byteLength < byteOffset + (length || 0)) {
      throw new RangeError('"length" is outside of buffer bounds')
    }
  
    var buf
    if (byteOffset === undefined && length === undefined) {
      buf = new Uint8Array(array)
    } else if (length === undefined) {
      buf = new Uint8Array(array, byteOffset)
    } else {
      buf = new Uint8Array(array, byteOffset, length)
    }
  
    // Return an augmented `Uint8Array` instance
    buf.__proto__ = Buffer.prototype
    return buf
  }
  
  function fromObject (obj) {
    if (Buffer.isBuffer(obj)) {
      var len = checked(obj.length) | 0
      var buf = createBuffer(len)
  
      if (buf.length === 0) {
        return buf
      }
  
      obj.copy(buf, 0, 0, len)
      return buf
    }
  
    if (obj.length !== undefined) {
      if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
        return createBuffer(0)
      }
      return fromArrayLike(obj)
    }
  
    if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
      return fromArrayLike(obj.data)
    }
  }
  
  function checked (length) {
    // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
    // length is NaN (which is otherwise coerced to zero.)
    if (length >= K_MAX_LENGTH) {
      throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                           'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
    }
    return length | 0
  }
  
  function SlowBuffer (length) {
    if (+length != length) { // eslint-disable-line eqeqeq
      length = 0
    }
    return Buffer.alloc(+length)
  }
  
  Buffer.isBuffer = function isBuffer (b) {
    return b != null && b._isBuffer === true &&
      b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
  }
  
  Buffer.compare = function compare (a, b) {
    if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
    if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
    if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
      throw new TypeError(
        'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
      )
    }
  
    if (a === b) return 0
  
    var x = a.length
    var y = b.length
  
    for (var i = 0, len = Math.min(x, y); i < len; ++i) {
      if (a[i] !== b[i]) {
        x = a[i]
        y = b[i]
        break
      }
    }
  
    if (x < y) return -1
    if (y < x) return 1
    return 0
  }
  
  Buffer.isEncoding = function isEncoding (encoding) {
    switch (String(encoding).toLowerCase()) {
      case 'hex':
      case 'utf8':
      case 'utf-8':
      case 'ascii':
      case 'latin1':
      case 'binary':
      case 'base64':
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return true
      default:
        return false
    }
  }
  
  Buffer.concat = function concat (list, length) {
    if (!Array.isArray(list)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
  
    if (list.length === 0) {
      return Buffer.alloc(0)
    }
  
    var i
    if (length === undefined) {
      length = 0
      for (i = 0; i < list.length; ++i) {
        length += list[i].length
      }
    }
  
    var buffer = Buffer.allocUnsafe(length)
    var pos = 0
    for (i = 0; i < list.length; ++i) {
      var buf = list[i]
      if (isInstance(buf, Uint8Array)) {
        buf = Buffer.from(buf)
      }
      if (!Buffer.isBuffer(buf)) {
        throw new TypeError('"list" argument must be an Array of Buffers')
      }
      buf.copy(buffer, pos)
      pos += buf.length
    }
    return buffer
  }
  
  function byteLength (string, encoding) {
    if (Buffer.isBuffer(string)) {
      return string.length
    }
    if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
      return string.byteLength
    }
    if (typeof string !== 'string') {
      throw new TypeError(
        'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
        'Received type ' + typeof string
      )
    }
  
    var len = string.length
    var mustMatch = (arguments.length > 2 && arguments[2] === true)
    if (!mustMatch && len === 0) return 0
  
    // Use a for loop to avoid recursion
    var loweredCase = false
    for (;;) {
      switch (encoding) {
        case 'ascii':
        case 'latin1':
        case 'binary':
          return len
        case 'utf8':
        case 'utf-8':
          return utf8ToBytes(string).length
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return len * 2
        case 'hex':
          return len >>> 1
        case 'base64':
          return base64ToBytes(string).length
        default:
          if (loweredCase) {
            return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
          }
          encoding = ('' + encoding).toLowerCase()
          loweredCase = true
      }
    }
  }
  Buffer.byteLength = byteLength
  
  function slowToString (encoding, start, end) {
    var loweredCase = false
  
    // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
    // property of a typed array.
  
    // This behaves neither like String nor Uint8Array in that we set start/end
    // to their upper/lower bounds if the value passed is out of range.
    // undefined is handled specially as per ECMA-262 6th Edition,
    // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
    if (start === undefined || start < 0) {
      start = 0
    }
    // Return early if start > this.length. Done here to prevent potential uint32
    // coercion fail below.
    if (start > this.length) {
      return ''
    }
  
    if (end === undefined || end > this.length) {
      end = this.length
    }
  
    if (end <= 0) {
      return ''
    }
  
    // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
    end >>>= 0
    start >>>= 0
  
    if (end <= start) {
      return ''
    }
  
    if (!encoding) encoding = 'utf8'
  
    while (true) {
      switch (encoding) {
        case 'hex':
          return hexSlice(this, start, end)
  
        case 'utf8':
        case 'utf-8':
          return utf8Slice(this, start, end)
  
        case 'ascii':
          return asciiSlice(this, start, end)
  
        case 'latin1':
        case 'binary':
          return latin1Slice(this, start, end)
  
        case 'base64':
          return base64Slice(this, start, end)
  
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return utf16leSlice(this, start, end)
  
        default:
          if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
          encoding = (encoding + '').toLowerCase()
          loweredCase = true
      }
    }
  }
  
  // This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
  // to detect a Buffer instance. It's not possible to use `instanceof Buffer`
  // reliably in a browserify context because there could be multiple different
  // copies of the 'buffer' package in use. This method works even for Buffer
  // instances that were created from another copy of the `buffer` package.
  // See: https://github.com/feross/buffer/issues/154
  Buffer.prototype._isBuffer = true
  
  function swap (b, n, m) {
    var i = b[n]
    b[n] = b[m]
    b[m] = i
  }
  
  Buffer.prototype.swap16 = function swap16 () {
    var len = this.length
    if (len % 2 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 16-bits')
    }
    for (var i = 0; i < len; i += 2) {
      swap(this, i, i + 1)
    }
    return this
  }
  
  Buffer.prototype.swap32 = function swap32 () {
    var len = this.length
    if (len % 4 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 32-bits')
    }
    for (var i = 0; i < len; i += 4) {
      swap(this, i, i + 3)
      swap(this, i + 1, i + 2)
    }
    return this
  }
  
  Buffer.prototype.swap64 = function swap64 () {
    var len = this.length
    if (len % 8 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 64-bits')
    }
    for (var i = 0; i < len; i += 8) {
      swap(this, i, i + 7)
      swap(this, i + 1, i + 6)
      swap(this, i + 2, i + 5)
      swap(this, i + 3, i + 4)
    }
    return this
  }
  
  Buffer.prototype.toString = function toString () {
    var length = this.length
    if (length === 0) return ''
    if (arguments.length === 0) return utf8Slice(this, 0, length)
    return slowToString.apply(this, arguments)
  }
  
  Buffer.prototype.toLocaleString = Buffer.prototype.toString
  
  Buffer.prototype.equals = function equals (b) {
    if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
    if (this === b) return true
    return Buffer.compare(this, b) === 0
  }
  
  Buffer.prototype.inspect = function inspect () {
    var str = ''
    var max = exports.INSPECT_MAX_BYTES
    str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
    if (this.length > max) str += ' ... '
    return '<Buffer ' + str + '>'
  }
  
  Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
    if (isInstance(target, Uint8Array)) {
      target = Buffer.from(target, target.offset, target.byteLength)
    }
    if (!Buffer.isBuffer(target)) {
      throw new TypeError(
        'The "target" argument must be one of type Buffer or Uint8Array. ' +
        'Received type ' + (typeof target)
      )
    }
  
    if (start === undefined) {
      start = 0
    }
    if (end === undefined) {
      end = target ? target.length : 0
    }
    if (thisStart === undefined) {
      thisStart = 0
    }
    if (thisEnd === undefined) {
      thisEnd = this.length
    }
  
    if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
      throw new RangeError('out of range index')
    }
  
    if (thisStart >= thisEnd && start >= end) {
      return 0
    }
    if (thisStart >= thisEnd) {
      return -1
    }
    if (start >= end) {
      return 1
    }
  
    start >>>= 0
    end >>>= 0
    thisStart >>>= 0
    thisEnd >>>= 0
  
    if (this === target) return 0
  
    var x = thisEnd - thisStart
    var y = end - start
    var len = Math.min(x, y)
  
    var thisCopy = this.slice(thisStart, thisEnd)
    var targetCopy = target.slice(start, end)
  
    for (var i = 0; i < len; ++i) {
      if (thisCopy[i] !== targetCopy[i]) {
        x = thisCopy[i]
        y = targetCopy[i]
        break
      }
    }
  
    if (x < y) return -1
    if (y < x) return 1
    return 0
  }
  
  // Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
  // OR the last index of `val` in `buffer` at offset <= `byteOffset`.
  //
  // Arguments:
  // - buffer - a Buffer to search
  // - val - a string, Buffer, or number
  // - byteOffset - an index into `buffer`; will be clamped to an int32
  // - encoding - an optional encoding, relevant is val is a string
  // - dir - true for indexOf, false for lastIndexOf
  function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
    // Empty buffer means no match
    if (buffer.length === 0) return -1
  
    // Normalize byteOffset
    if (typeof byteOffset === 'string') {
      encoding = byteOffset
      byteOffset = 0
    } else if (byteOffset > 0x7fffffff) {
      byteOffset = 0x7fffffff
    } else if (byteOffset < -0x80000000) {
      byteOffset = -0x80000000
    }
    byteOffset = +byteOffset // Coerce to Number.
    if (numberIsNaN(byteOffset)) {
      // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
      byteOffset = dir ? 0 : (buffer.length - 1)
    }
  
    // Normalize byteOffset: negative offsets start from the end of the buffer
    if (byteOffset < 0) byteOffset = buffer.length + byteOffset
    if (byteOffset >= buffer.length) {
      if (dir) return -1
      else byteOffset = buffer.length - 1
    } else if (byteOffset < 0) {
      if (dir) byteOffset = 0
      else return -1
    }
  
    // Normalize val
    if (typeof val === 'string') {
      val = Buffer.from(val, encoding)
    }
  
    // Finally, search either indexOf (if dir is true) or lastIndexOf
    if (Buffer.isBuffer(val)) {
      // Special case: looking for empty string/buffer always fails
      if (val.length === 0) {
        return -1
      }
      return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
    } else if (typeof val === 'number') {
      val = val & 0xFF // Search for a byte value [0-255]
      if (typeof Uint8Array.prototype.indexOf === 'function') {
        if (dir) {
          return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
        } else {
          return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
        }
      }
      return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
    }
  
    throw new TypeError('val must be string, number or Buffer')
  }
  
  function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
    var indexSize = 1
    var arrLength = arr.length
    var valLength = val.length
  
    if (encoding !== undefined) {
      encoding = String(encoding).toLowerCase()
      if (encoding === 'ucs2' || encoding === 'ucs-2' ||
          encoding === 'utf16le' || encoding === 'utf-16le') {
        if (arr.length < 2 || val.length < 2) {
          return -1
        }
        indexSize = 2
        arrLength /= 2
        valLength /= 2
        byteOffset /= 2
      }
    }
  
    function read (buf, i) {
      if (indexSize === 1) {
        return buf[i]
      } else {
        return buf.readUInt16BE(i * indexSize)
      }
    }
  
    var i
    if (dir) {
      var foundIndex = -1
      for (i = byteOffset; i < arrLength; i++) {
        if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
          if (foundIndex === -1) foundIndex = i
          if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
        } else {
          if (foundIndex !== -1) i -= i - foundIndex
          foundIndex = -1
        }
      }
    } else {
      if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
      for (i = byteOffset; i >= 0; i--) {
        var found = true
        for (var j = 0; j < valLength; j++) {
          if (read(arr, i + j) !== read(val, j)) {
            found = false
            break
          }
        }
        if (found) return i
      }
    }
  
    return -1
  }
  
  Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
    return this.indexOf(val, byteOffset, encoding) !== -1
  }
  
  Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
  }
  
  Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
  }
  
  function hexWrite (buf, string, offset, length) {
    offset = Number(offset) || 0
    var remaining = buf.length - offset
    if (!length) {
      length = remaining
    } else {
      length = Number(length)
      if (length > remaining) {
        length = remaining
      }
    }
  
    var strLen = string.length
  
    if (length > strLen / 2) {
      length = strLen / 2
    }
    for (var i = 0; i < length; ++i) {
      var parsed = parseInt(string.substr(i * 2, 2), 16)
      if (numberIsNaN(parsed)) return i
      buf[offset + i] = parsed
    }
    return i
  }
  
  function utf8Write (buf, string, offset, length) {
    return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
  }
  
  function asciiWrite (buf, string, offset, length) {
    return blitBuffer(asciiToBytes(string), buf, offset, length)
  }
  
  function latin1Write (buf, string, offset, length) {
    return asciiWrite(buf, string, offset, length)
  }
  
  function base64Write (buf, string, offset, length) {
    return blitBuffer(base64ToBytes(string), buf, offset, length)
  }
  
  function ucs2Write (buf, string, offset, length) {
    return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
  }
  
  Buffer.prototype.write = function write (string, offset, length, encoding) {
    // Buffer#write(string)
    if (offset === undefined) {
      encoding = 'utf8'
      length = this.length
      offset = 0
    // Buffer#write(string, encoding)
    } else if (length === undefined && typeof offset === 'string') {
      encoding = offset
      length = this.length
      offset = 0
    // Buffer#write(string, offset[, length][, encoding])
    } else if (isFinite(offset)) {
      offset = offset >>> 0
      if (isFinite(length)) {
        length = length >>> 0
        if (encoding === undefined) encoding = 'utf8'
      } else {
        encoding = length
        length = undefined
      }
    } else {
      throw new Error(
        'Buffer.write(string, encoding, offset[, length]) is no longer supported'
      )
    }
  
    var remaining = this.length - offset
    if (length === undefined || length > remaining) length = remaining
  
    if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
      throw new RangeError('Attempt to write outside buffer bounds')
    }
  
    if (!encoding) encoding = 'utf8'
  
    var loweredCase = false
    for (;;) {
      switch (encoding) {
        case 'hex':
          return hexWrite(this, string, offset, length)
  
        case 'utf8':
        case 'utf-8':
          return utf8Write(this, string, offset, length)
  
        case 'ascii':
          return asciiWrite(this, string, offset, length)
  
        case 'latin1':
        case 'binary':
          return latin1Write(this, string, offset, length)
  
        case 'base64':
          // Warning: maxLength not taken into account in base64Write
          return base64Write(this, string, offset, length)
  
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return ucs2Write(this, string, offset, length)
  
        default:
          if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
          encoding = ('' + encoding).toLowerCase()
          loweredCase = true
      }
    }
  }
  
  Buffer.prototype.toJSON = function toJSON () {
    return {
      type: 'Buffer',
      data: Array.prototype.slice.call(this._arr || this, 0)
    }
  }
  
  function base64Slice (buf, start, end) {
    if (start === 0 && end === buf.length) {
      return base64.fromByteArray(buf)
    } else {
      return base64.fromByteArray(buf.slice(start, end))
    }
  }
  
  function utf8Slice (buf, start, end) {
    end = Math.min(buf.length, end)
    var res = []
  
    var i = start
    while (i < end) {
      var firstByte = buf[i]
      var codePoint = null
      var bytesPerSequence = (firstByte > 0xEF) ? 4
        : (firstByte > 0xDF) ? 3
          : (firstByte > 0xBF) ? 2
            : 1
  
      if (i + bytesPerSequence <= end) {
        var secondByte, thirdByte, fourthByte, tempCodePoint
  
        switch (bytesPerSequence) {
          case 1:
            if (firstByte < 0x80) {
              codePoint = firstByte
            }
            break
          case 2:
            secondByte = buf[i + 1]
            if ((secondByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
              if (tempCodePoint > 0x7F) {
                codePoint = tempCodePoint
              }
            }
            break
          case 3:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
              if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                codePoint = tempCodePoint
              }
            }
            break
          case 4:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            fourthByte = buf[i + 3]
            if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
              if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                codePoint = tempCodePoint
              }
            }
        }
      }
  
      if (codePoint === null) {
        // we did not generate a valid codePoint so insert a
        // replacement char (U+FFFD) and advance only 1 byte
        codePoint = 0xFFFD
        bytesPerSequence = 1
      } else if (codePoint > 0xFFFF) {
        // encode to utf16 (surrogate pair dance)
        codePoint -= 0x10000
        res.push(codePoint >>> 10 & 0x3FF | 0xD800)
        codePoint = 0xDC00 | codePoint & 0x3FF
      }
  
      res.push(codePoint)
      i += bytesPerSequence
    }
  
    return decodeCodePointsArray(res)
  }
  
  // Based on http://stackoverflow.com/a/22747272/680742, the browser with
  // the lowest limit is Chrome, with 0x10000 args.
  // We go 1 magnitude less, for safety
  var MAX_ARGUMENTS_LENGTH = 0x1000
  
  function decodeCodePointsArray (codePoints) {
    var len = codePoints.length
    if (len <= MAX_ARGUMENTS_LENGTH) {
      return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
    }
  
    // Decode in chunks to avoid "call stack size exceeded".
    var res = ''
    var i = 0
    while (i < len) {
      res += String.fromCharCode.apply(
        String,
        codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
      )
    }
    return res
  }
  
  function asciiSlice (buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)
  
    for (var i = start; i < end; ++i) {
      ret += String.fromCharCode(buf[i] & 0x7F)
    }
    return ret
  }
  
  function latin1Slice (buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)
  
    for (var i = start; i < end; ++i) {
      ret += String.fromCharCode(buf[i])
    }
    return ret
  }
  
  function hexSlice (buf, start, end) {
    var len = buf.length
  
    if (!start || start < 0) start = 0
    if (!end || end < 0 || end > len) end = len
  
    var out = ''
    for (var i = start; i < end; ++i) {
      out += toHex(buf[i])
    }
    return out
  }
  
  function utf16leSlice (buf, start, end) {
    var bytes = buf.slice(start, end)
    var res = ''
    for (var i = 0; i < bytes.length; i += 2) {
      res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
    }
    return res
  }
  
  Buffer.prototype.slice = function slice (start, end) {
    var len = this.length
    start = ~~start
    end = end === undefined ? len : ~~end
  
    if (start < 0) {
      start += len
      if (start < 0) start = 0
    } else if (start > len) {
      start = len
    }
  
    if (end < 0) {
      end += len
      if (end < 0) end = 0
    } else if (end > len) {
      end = len
    }
  
    if (end < start) end = start
  
    var newBuf = this.subarray(start, end)
    // Return an augmented `Uint8Array` instance
    newBuf.__proto__ = Buffer.prototype
    return newBuf
  }
  
  /*
   * Need to make sure that buffer isn't trying to write out of bounds.
   */
  function checkOffset (offset, ext, length) {
    if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
    if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
  }
  
  Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var val = this[offset]
    var mul = 1
    var i = 0
    while (++i < byteLength && (mul *= 0x100)) {
      val += this[offset + i] * mul
    }
  
    return val
  }
  
  Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) {
      checkOffset(offset, byteLength, this.length)
    }
  
    var val = this[offset + --byteLength]
    var mul = 1
    while (byteLength > 0 && (mul *= 0x100)) {
      val += this[offset + --byteLength] * mul
    }
  
    return val
  }
  
  Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 1, this.length)
    return this[offset]
  }
  
  Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 2, this.length)
    return this[offset] | (this[offset + 1] << 8)
  }
  
  Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 2, this.length)
    return (this[offset] << 8) | this[offset + 1]
  }
  
  Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return ((this[offset]) |
        (this[offset + 1] << 8) |
        (this[offset + 2] << 16)) +
        (this[offset + 3] * 0x1000000)
  }
  
  Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset] * 0x1000000) +
      ((this[offset + 1] << 16) |
      (this[offset + 2] << 8) |
      this[offset + 3])
  }
  
  Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var val = this[offset]
    var mul = 1
    var i = 0
    while (++i < byteLength && (mul *= 0x100)) {
      val += this[offset + i] * mul
    }
    mul *= 0x80
  
    if (val >= mul) val -= Math.pow(2, 8 * byteLength)
  
    return val
  }
  
  Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var i = byteLength
    var mul = 1
    var val = this[offset + --i]
    while (i > 0 && (mul *= 0x100)) {
      val += this[offset + --i] * mul
    }
    mul *= 0x80
  
    if (val >= mul) val -= Math.pow(2, 8 * byteLength)
  
    return val
  }
  
  Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 1, this.length)
    if (!(this[offset] & 0x80)) return (this[offset])
    return ((0xff - this[offset] + 1) * -1)
  }
  
  Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset] | (this[offset + 1] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
  }
  
  Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset + 1] | (this[offset] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
  }
  
  Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16) |
      (this[offset + 3] << 24)
  }
  
  Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset] << 24) |
      (this[offset + 1] << 16) |
      (this[offset + 2] << 8) |
      (this[offset + 3])
  }
  
  Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, true, 23, 4)
  }
  
  Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, false, 23, 4)
  }
  
  Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, true, 52, 8)
  }
  
  Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, false, 52, 8)
  }
  
  function checkInt (buf, value, offset, ext, max, min) {
    if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
    if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
  }
  
  Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) {
      var maxBytes = Math.pow(2, 8 * byteLength) - 1
      checkInt(this, value, offset, byteLength, maxBytes, 0)
    }
  
    var mul = 1
    var i = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
      this[offset + i] = (value / mul) & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) {
      var maxBytes = Math.pow(2, 8 * byteLength) - 1
      checkInt(this, value, offset, byteLength, maxBytes, 0)
    }
  
    var i = byteLength - 1
    var mul = 1
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
      this[offset + i] = (value / mul) & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
    this[offset] = (value & 0xff)
    return offset + 1
  }
  
  Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    return offset + 2
  }
  
  Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
    return offset + 2
  }
  
  Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
    this[offset + 3] = (value >>> 24)
    this[offset + 2] = (value >>> 16)
    this[offset + 1] = (value >>> 8)
    this[offset] = (value & 0xff)
    return offset + 4
  }
  
  Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
    return offset + 4
  }
  
  Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
      var limit = Math.pow(2, (8 * byteLength) - 1)
  
      checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }
  
    var i = 0
    var mul = 1
    var sub = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
      if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
        sub = 1
      }
      this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
      var limit = Math.pow(2, (8 * byteLength) - 1)
  
      checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }
  
    var i = byteLength - 1
    var mul = 1
    var sub = 0
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
      if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
        sub = 1
      }
      this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
    if (value < 0) value = 0xff + value + 1
    this[offset] = (value & 0xff)
    return offset + 1
  }
  
  Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    return offset + 2
  }
  
  Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
    return offset + 2
  }
  
  Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    this[offset + 2] = (value >>> 16)
    this[offset + 3] = (value >>> 24)
    return offset + 4
  }
  
  Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    if (value < 0) value = 0xffffffff + value + 1
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
    return offset + 4
  }
  
  function checkIEEE754 (buf, value, offset, ext, max, min) {
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
    if (offset < 0) throw new RangeError('Index out of range')
  }
  
  function writeFloat (buf, value, offset, littleEndian, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
      checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
    }
    ieee754.write(buf, value, offset, littleEndian, 23, 4)
    return offset + 4
  }
  
  Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
    return writeFloat(this, value, offset, true, noAssert)
  }
  
  Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
    return writeFloat(this, value, offset, false, noAssert)
  }
  
  function writeDouble (buf, value, offset, littleEndian, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
      checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
    }
    ieee754.write(buf, value, offset, littleEndian, 52, 8)
    return offset + 8
  }
  
  Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
    return writeDouble(this, value, offset, true, noAssert)
  }
  
  Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
    return writeDouble(this, value, offset, false, noAssert)
  }
  
  // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
  Buffer.prototype.copy = function copy (target, targetStart, start, end) {
    if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
    if (!start) start = 0
    if (!end && end !== 0) end = this.length
    if (targetStart >= target.length) targetStart = target.length
    if (!targetStart) targetStart = 0
    if (end > 0 && end < start) end = start
  
    // Copy 0 bytes; we're done
    if (end === start) return 0
    if (target.length === 0 || this.length === 0) return 0
  
    // Fatal error conditions
    if (targetStart < 0) {
      throw new RangeError('targetStart out of bounds')
    }
    if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
    if (end < 0) throw new RangeError('sourceEnd out of bounds')
  
    // Are we oob?
    if (end > this.length) end = this.length
    if (target.length - targetStart < end - start) {
      end = target.length - targetStart + start
    }
  
    var len = end - start
  
    if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
      // Use built-in when available, missing from IE11
      this.copyWithin(targetStart, start, end)
    } else if (this === target && start < targetStart && targetStart < end) {
      // descending copy from end
      for (var i = len - 1; i >= 0; --i) {
        target[i + targetStart] = this[i + start]
      }
    } else {
      Uint8Array.prototype.set.call(
        target,
        this.subarray(start, end),
        targetStart
      )
    }
  
    return len
  }
  
  // Usage:
  //    buffer.fill(number[, offset[, end]])
  //    buffer.fill(buffer[, offset[, end]])
  //    buffer.fill(string[, offset[, end]][, encoding])
  Buffer.prototype.fill = function fill (val, start, end, encoding) {
    // Handle string cases:
    if (typeof val === 'string') {
      if (typeof start === 'string') {
        encoding = start
        start = 0
        end = this.length
      } else if (typeof end === 'string') {
        encoding = end
        end = this.length
      }
      if (encoding !== undefined && typeof encoding !== 'string') {
        throw new TypeError('encoding must be a string')
      }
      if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
        throw new TypeError('Unknown encoding: ' + encoding)
      }
      if (val.length === 1) {
        var code = val.charCodeAt(0)
        if ((encoding === 'utf8' && code < 128) ||
            encoding === 'latin1') {
          // Fast path: If `val` fits into a single byte, use that numeric value.
          val = code
        }
      }
    } else if (typeof val === 'number') {
      val = val & 255
    }
  
    // Invalid ranges are not set to a default, so can range check early.
    if (start < 0 || this.length < start || this.length < end) {
      throw new RangeError('Out of range index')
    }
  
    if (end <= start) {
      return this
    }
  
    start = start >>> 0
    end = end === undefined ? this.length : end >>> 0
  
    if (!val) val = 0
  
    var i
    if (typeof val === 'number') {
      for (i = start; i < end; ++i) {
        this[i] = val
      }
    } else {
      var bytes = Buffer.isBuffer(val)
        ? val
        : Buffer.from(val, encoding)
      var len = bytes.length
      if (len === 0) {
        throw new TypeError('The value "' + val +
          '" is invalid for argument "value"')
      }
      for (i = 0; i < end - start; ++i) {
        this[i + start] = bytes[i % len]
      }
    }
  
    return this
  }
  
  // HELPER FUNCTIONS
  // ================
  
  var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g
  
  function base64clean (str) {
    // Node takes equal signs as end of the Base64 encoding
    str = str.split('=')[0]
    // Node strips out invalid characters like \n and \t from the string, base64-js does not
    str = str.trim().replace(INVALID_BASE64_RE, '')
    // Node converts strings with length < 2 to ''
    if (str.length < 2) return ''
    // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
    while (str.length % 4 !== 0) {
      str = str + '='
    }
    return str
  }
  
  function toHex (n) {
    if (n < 16) return '0' + n.toString(16)
    return n.toString(16)
  }
  
  function utf8ToBytes (string, units) {
    units = units || Infinity
    var codePoint
    var length = string.length
    var leadSurrogate = null
    var bytes = []
  
    for (var i = 0; i < length; ++i) {
      codePoint = string.charCodeAt(i)
  
      // is surrogate component
      if (codePoint > 0xD7FF && codePoint < 0xE000) {
        // last char was a lead
        if (!leadSurrogate) {
          // no lead yet
          if (codePoint > 0xDBFF) {
            // unexpected trail
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
            continue
          } else if (i + 1 === length) {
            // unpaired lead
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
            continue
          }
  
          // valid lead
          leadSurrogate = codePoint
  
          continue
        }
  
        // 2 leads in a row
        if (codePoint < 0xDC00) {
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          leadSurrogate = codePoint
          continue
        }
  
        // valid surrogate pair
        codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
      } else if (leadSurrogate) {
        // valid bmp char, but last char was a lead
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
      }
  
      leadSurrogate = null
  
      // encode utf8
      if (codePoint < 0x80) {
        if ((units -= 1) < 0) break
        bytes.push(codePoint)
      } else if (codePoint < 0x800) {
        if ((units -= 2) < 0) break
        bytes.push(
          codePoint >> 0x6 | 0xC0,
          codePoint & 0x3F | 0x80
        )
      } else if (codePoint < 0x10000) {
        if ((units -= 3) < 0) break
        bytes.push(
          codePoint >> 0xC | 0xE0,
          codePoint >> 0x6 & 0x3F | 0x80,
          codePoint & 0x3F | 0x80
        )
      } else if (codePoint < 0x110000) {
        if ((units -= 4) < 0) break
        bytes.push(
          codePoint >> 0x12 | 0xF0,
          codePoint >> 0xC & 0x3F | 0x80,
          codePoint >> 0x6 & 0x3F | 0x80,
          codePoint & 0x3F | 0x80
        )
      } else {
        throw new Error('Invalid code point')
      }
    }
  
    return bytes
  }
  
  function asciiToBytes (str) {
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
      // Node's code seems to be doing this and not & 0x7F..
      byteArray.push(str.charCodeAt(i) & 0xFF)
    }
    return byteArray
  }
  
  function utf16leToBytes (str, units) {
    var c, hi, lo
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
      if ((units -= 2) < 0) break
  
      c = str.charCodeAt(i)
      hi = c >> 8
      lo = c % 256
      byteArray.push(lo)
      byteArray.push(hi)
    }
  
    return byteArray
  }
  
  function base64ToBytes (str) {
    return base64.toByteArray(base64clean(str))
  }
  
  function blitBuffer (src, dst, offset, length) {
    for (var i = 0; i < length; ++i) {
      if ((i + offset >= dst.length) || (i >= src.length)) break
      dst[i + offset] = src[i]
    }
    return i
  }
  
  // ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
  // the `instanceof` check but they should be treated as of that type.
  // See: https://github.com/feross/buffer/issues/166
  function isInstance (obj, type) {
    return obj instanceof type ||
      (obj != null && obj.constructor != null && obj.constructor.name != null &&
        obj.constructor.name === type.name)
  }
  function numberIsNaN (obj) {
    // For IE11 support
    return obj !== obj // eslint-disable-line no-self-compare
  }
  
  }).call(this)}).call(this,require("buffer").Buffer)
  },{"base64-js":6,"buffer":10,"ieee754":36}],11:[function(require,module,exports){
  /**
   * Slice reference.
   */
  
  var slice = [].slice;
  
  /**
   * Bind `obj` to `fn`.
   *
   * @param {Object} obj
   * @param {Function|String} fn or string
   * @return {Function}
   * @api public
   */
  
  module.exports = function(obj, fn){
    if ('string' == typeof fn) fn = obj[fn];
    if ('function' != typeof fn) throw new Error('bind() requires a function');
    var args = slice.call(arguments, 2);
    return function(){
      return fn.apply(obj, args.concat(slice.call(arguments)));
    }
  };
  
  },{}],12:[function(require,module,exports){
  
  /**
   * Expose `Emitter`.
   */
  
  if (typeof module !== 'undefined') {
    module.exports = Emitter;
  }
  
  /**
   * Initialize a new `Emitter`.
   *
   * @api public
   */
  
  function Emitter(obj) {
    if (obj) return mixin(obj);
  };
  
  /**
   * Mixin the emitter properties.
   *
   * @param {Object} obj
   * @return {Object}
   * @api private
   */
  
  function mixin(obj) {
    for (var key in Emitter.prototype) {
      obj[key] = Emitter.prototype[key];
    }
    return obj;
  }
  
  /**
   * Listen on the given `event` with `fn`.
   *
   * @param {String} event
   * @param {Function} fn
   * @return {Emitter}
   * @api public
   */
  
  Emitter.prototype.on =
  Emitter.prototype.addEventListener = function(event, fn){
    this._callbacks = this._callbacks || {};
    (this._callbacks['$' + event] = this._callbacks['$' + event] || [])
      .push(fn);
    return this;
  };
  
  /**
   * Adds an `event` listener that will be invoked a single
   * time then automatically removed.
   *
   * @param {String} event
   * @param {Function} fn
   * @return {Emitter}
   * @api public
   */
  
  Emitter.prototype.once = function(event, fn){
    function on() {
      this.off(event, on);
      fn.apply(this, arguments);
    }
  
    on.fn = fn;
    this.on(event, on);
    return this;
  };
  
  /**
   * Remove the given callback for `event` or all
   * registered callbacks.
   *
   * @param {String} event
   * @param {Function} fn
   * @return {Emitter}
   * @api public
   */
  
  Emitter.prototype.off =
  Emitter.prototype.removeListener =
  Emitter.prototype.removeAllListeners =
  Emitter.prototype.removeEventListener = function(event, fn){
    this._callbacks = this._callbacks || {};
  
    // all
    if (0 == arguments.length) {
      this._callbacks = {};
      return this;
    }
  
    // specific event
    var callbacks = this._callbacks['$' + event];
    if (!callbacks) return this;
  
    // remove all handlers
    if (1 == arguments.length) {
      delete this._callbacks['$' + event];
      return this;
    }
  
    // remove specific handler
    var cb;
    for (var i = 0; i < callbacks.length; i++) {
      cb = callbacks[i];
      if (cb === fn || cb.fn === fn) {
        callbacks.splice(i, 1);
        break;
      }
    }
  
    // Remove event specific arrays for event types that no
    // one is subscribed for to avoid memory leak.
    if (callbacks.length === 0) {
      delete this._callbacks['$' + event];
    }
  
    return this;
  };
  
  /**
   * Emit `event` with the given args.
   *
   * @param {String} event
   * @param {Mixed} ...
   * @return {Emitter}
   */
  
  Emitter.prototype.emit = function(event){
    this._callbacks = this._callbacks || {};
  
    var args = new Array(arguments.length - 1)
      , callbacks = this._callbacks['$' + event];
  
    for (var i = 1; i < arguments.length; i++) {
      args[i - 1] = arguments[i];
    }
  
    if (callbacks) {
      callbacks = callbacks.slice(0);
      for (var i = 0, len = callbacks.length; i < len; ++i) {
        callbacks[i].apply(this, args);
      }
    }
  
    return this;
  };
  
  /**
   * Return array of callbacks for `event`.
   *
   * @param {String} event
   * @return {Array}
   * @api public
   */
  
  Emitter.prototype.listeners = function(event){
    this._callbacks = this._callbacks || {};
    return this._callbacks['$' + event] || [];
  };
  
  /**
   * Check if this emitter has `event` handlers.
   *
   * @param {String} event
   * @return {Boolean}
   * @api public
   */
  
  Emitter.prototype.hasListeners = function(event){
    return !! this.listeners(event).length;
  };
  
  },{}],13:[function(require,module,exports){
  
  module.exports = function(a, b){
    var fn = function(){};
    fn.prototype = b.prototype;
    a.prototype = new fn;
    a.prototype.constructor = a;
  };
  },{}],14:[function(require,module,exports){
  module.exports = (function () {
    if (typeof self !== 'undefined') {
      return self;
    } else if (typeof window !== 'undefined') {
      return window;
    } else {
      return Function('return this')(); // eslint-disable-line no-new-func
    }
  })();
  
  },{}],15:[function(require,module,exports){
  
  module.exports = require('./socket');
  
  /**
   * Exports parser
   *
   * @api public
   *
   */
  module.exports.parser = require('engine.io-parser');
  
  },{"./socket":16,"engine.io-parser":26}],16:[function(require,module,exports){
  /**
   * Module dependencies.
   */
  
  var transports = require('./transports/index');
  var Emitter = require('component-emitter');
  var debug = require('debug')('engine.io-client:socket');
  var index = require('indexof');
  var parser = require('engine.io-parser');
  var parseuri = require('parseuri');
  var parseqs = require('parseqs');
  
  /**
   * Module exports.
   */
  
  module.exports = Socket;
  
  /**
   * Socket constructor.
   *
   * @param {String|Object} uri or options
   * @param {Object} options
   * @api public
   */
  
  function Socket (uri, opts) {
    if (!(this instanceof Socket)) return new Socket(uri, opts);
  
    opts = opts || {};
  
    if (uri && 'object' === typeof uri) {
      opts = uri;
      uri = null;
    }
  
    if (uri) {
      uri = parseuri(uri);
      opts.hostname = uri.host;
      opts.secure = uri.protocol === 'https' || uri.protocol === 'wss';
      opts.port = uri.port;
      if (uri.query) opts.query = uri.query;
    } else if (opts.host) {
      opts.hostname = parseuri(opts.host).host;
    }
  
    this.secure = null != opts.secure ? opts.secure
      : (typeof location !== 'undefined' && 'https:' === location.protocol);
  
    if (opts.hostname && !opts.port) {
      // if no port is specified manually, use the protocol default
      opts.port = this.secure ? '443' : '80';
    }
  
    this.agent = opts.agent || false;
    this.hostname = opts.hostname ||
      (typeof location !== 'undefined' ? location.hostname : 'localhost');
    this.port = opts.port || (typeof location !== 'undefined' && location.port
        ? location.port
        : (this.secure ? 443 : 80));
    this.query = opts.query || {};
    if ('string' === typeof this.query) this.query = parseqs.decode(this.query);
    this.upgrade = false !== opts.upgrade;
    this.path = (opts.path || '/engine.io').replace(/\/$/, '') + '/';
    this.forceJSONP = !!opts.forceJSONP;
    this.jsonp = false !== opts.jsonp;
    this.forceBase64 = !!opts.forceBase64;
    this.enablesXDR = !!opts.enablesXDR;
    this.withCredentials = false !== opts.withCredentials;
    this.timestampParam = opts.timestampParam || 't';
    this.timestampRequests = opts.timestampRequests;
    this.transports = opts.transports || ['polling', 'websocket'];
    this.transportOptions = opts.transportOptions || {};
    this.readyState = '';
    this.writeBuffer = [];
    this.prevBufferLen = 0;
    this.policyPort = opts.policyPort || 843;
    this.rememberUpgrade = opts.rememberUpgrade || false;
    this.binaryType = null;
    this.onlyBinaryUpgrades = opts.onlyBinaryUpgrades;
    this.perMessageDeflate = false !== opts.perMessageDeflate ? (opts.perMessageDeflate || {}) : false;
  
    if (true === this.perMessageDeflate) this.perMessageDeflate = {};
    if (this.perMessageDeflate && null == this.perMessageDeflate.threshold) {
      this.perMessageDeflate.threshold = 1024;
    }
  
    // SSL options for Node.js client
    this.pfx = opts.pfx || undefined;
    this.key = opts.key || undefined;
    this.passphrase = opts.passphrase || undefined;
    this.cert = opts.cert || undefined;
    this.ca = opts.ca || undefined;
    this.ciphers = opts.ciphers || undefined;
    this.rejectUnauthorized = opts.rejectUnauthorized === undefined ? true : opts.rejectUnauthorized;
    this.forceNode = !!opts.forceNode;
  
    // detect ReactNative environment
    this.isReactNative = (typeof navigator !== 'undefined' && typeof navigator.product === 'string' && navigator.product.toLowerCase() === 'reactnative');
  
    // other options for Node.js or ReactNative client
    if (typeof self === 'undefined' || this.isReactNative) {
      if (opts.extraHeaders && Object.keys(opts.extraHeaders).length > 0) {
        this.extraHeaders = opts.extraHeaders;
      }
  
      if (opts.localAddress) {
        this.localAddress = opts.localAddress;
      }
    }
  
    // set on handshake
    this.id = null;
    this.upgrades = null;
    this.pingInterval = null;
    this.pingTimeout = null;
  
    // set on heartbeat
    this.pingIntervalTimer = null;
    this.pingTimeoutTimer = null;
  
    this.open();
  }
  
  Socket.priorWebsocketSuccess = false;
  
  /**
   * Mix in `Emitter`.
   */
  
  Emitter(Socket.prototype);
  
  /**
   * Protocol version.
   *
   * @api public
   */
  
  Socket.protocol = parser.protocol; // this is an int
  
  /**
   * Expose deps for legacy compatibility
   * and standalone browser access.
   */
  
  Socket.Socket = Socket;
  Socket.Transport = require('./transport');
  Socket.transports = require('./transports/index');
  Socket.parser = require('engine.io-parser');
  
  /**
   * Creates transport of the given type.
   *
   * @param {String} transport name
   * @return {Transport}
   * @api private
   */
  
  Socket.prototype.createTransport = function (name) {
    debug('creating transport "%s"', name);
    var query = clone(this.query);
  
    // append engine.io protocol identifier
    query.EIO = parser.protocol;
  
    // transport name
    query.transport = name;
  
    // per-transport options
    var options = this.transportOptions[name] || {};
  
    // session id if we already have one
    if (this.id) query.sid = this.id;
  
    var transport = new transports[name]({
      query: query,
      socket: this,
      agent: options.agent || this.agent,
      hostname: options.hostname || this.hostname,
      port: options.port || this.port,
      secure: options.secure || this.secure,
      path: options.path || this.path,
      forceJSONP: options.forceJSONP || this.forceJSONP,
      jsonp: options.jsonp || this.jsonp,
      forceBase64: options.forceBase64 || this.forceBase64,
      enablesXDR: options.enablesXDR || this.enablesXDR,
      withCredentials: options.withCredentials || this.withCredentials,
      timestampRequests: options.timestampRequests || this.timestampRequests,
      timestampParam: options.timestampParam || this.timestampParam,
      policyPort: options.policyPort || this.policyPort,
      pfx: options.pfx || this.pfx,
      key: options.key || this.key,
      passphrase: options.passphrase || this.passphrase,
      cert: options.cert || this.cert,
      ca: options.ca || this.ca,
      ciphers: options.ciphers || this.ciphers,
      rejectUnauthorized: options.rejectUnauthorized || this.rejectUnauthorized,
      perMessageDeflate: options.perMessageDeflate || this.perMessageDeflate,
      extraHeaders: options.extraHeaders || this.extraHeaders,
      forceNode: options.forceNode || this.forceNode,
      localAddress: options.localAddress || this.localAddress,
      requestTimeout: options.requestTimeout || this.requestTimeout,
      protocols: options.protocols || void (0),
      isReactNative: this.isReactNative
    });
  
    return transport;
  };
  
  function clone (obj) {
    var o = {};
    for (var i in obj) {
      if (obj.hasOwnProperty(i)) {
        o[i] = obj[i];
      }
    }
    return o;
  }
  
  /**
   * Initializes transport to use and starts probe.
   *
   * @api private
   */
  Socket.prototype.open = function () {
    var transport;
    if (this.rememberUpgrade && Socket.priorWebsocketSuccess && this.transports.indexOf('websocket') !== -1) {
      transport = 'websocket';
    } else if (0 === this.transports.length) {
      // Emit error on next tick so it can be listened to
      var self = this;
      setTimeout(function () {
        self.emit('error', 'No transports available');
      }, 0);
      return;
    } else {
      transport = this.transports[0];
    }
    this.readyState = 'opening';
  
    // Retry with the next transport if the transport is disabled (jsonp: false)
    try {
      transport = this.createTransport(transport);
    } catch (e) {
      this.transports.shift();
      this.open();
      return;
    }
  
    transport.open();
    this.setTransport(transport);
  };
  
  /**
   * Sets the current transport. Disables the existing one (if any).
   *
   * @api private
   */
  
  Socket.prototype.setTransport = function (transport) {
    debug('setting transport %s', transport.name);
    var self = this;
  
    if (this.transport) {
      debug('clearing existing transport %s', this.transport.name);
      this.transport.removeAllListeners();
    }
  
    // set up transport
    this.transport = transport;
  
    // set up transport listeners
    transport
    .on('drain', function () {
      self.onDrain();
    })
    .on('packet', function (packet) {
      self.onPacket(packet);
    })
    .on('error', function (e) {
      self.onError(e);
    })
    .on('close', function () {
      self.onClose('transport close');
    });
  };
  
  /**
   * Probes a transport.
   *
   * @param {String} transport name
   * @api private
   */
  
  Socket.prototype.probe = function (name) {
    debug('probing transport "%s"', name);
    var transport = this.createTransport(name, { probe: 1 });
    var failed = false;
    var self = this;
  
    Socket.priorWebsocketSuccess = false;
  
    function onTransportOpen () {
      if (self.onlyBinaryUpgrades) {
        var upgradeLosesBinary = !this.supportsBinary && self.transport.supportsBinary;
        failed = failed || upgradeLosesBinary;
      }
      if (failed) return;
  
      debug('probe transport "%s" opened', name);
      transport.send([{ type: 'ping', data: 'probe' }]);
      transport.once('packet', function (msg) {
        if (failed) return;
        if ('pong' === msg.type && 'probe' === msg.data) {
          debug('probe transport "%s" pong', name);
          self.upgrading = true;
          self.emit('upgrading', transport);
          if (!transport) return;
          Socket.priorWebsocketSuccess = 'websocket' === transport.name;
  
          debug('pausing current transport "%s"', self.transport.name);
          self.transport.pause(function () {
            if (failed) return;
            if ('closed' === self.readyState) return;
            debug('changing transport and sending upgrade packet');
  
            cleanup();
  
            self.setTransport(transport);
            transport.send([{ type: 'upgrade' }]);
            self.emit('upgrade', transport);
            transport = null;
            self.upgrading = false;
            self.flush();
          });
        } else {
          debug('probe transport "%s" failed', name);
          var err = new Error('probe error');
          err.transport = transport.name;
          self.emit('upgradeError', err);
        }
      });
    }
  
    function freezeTransport () {
      if (failed) return;
  
      // Any callback called by transport should be ignored since now
      failed = true;
  
      cleanup();
  
      transport.close();
      transport = null;
    }
  
    // Handle any error that happens while probing
    function onerror (err) {
      var error = new Error('probe error: ' + err);
      error.transport = transport.name;
  
      freezeTransport();
  
      debug('probe transport "%s" failed because of error: %s', name, err);
  
      self.emit('upgradeError', error);
    }
  
    function onTransportClose () {
      onerror('transport closed');
    }
  
    // When the socket is closed while we're probing
    function onclose () {
      onerror('socket closed');
    }
  
    // When the socket is upgraded while we're probing
    function onupgrade (to) {
      if (transport && to.name !== transport.name) {
        debug('"%s" works - aborting "%s"', to.name, transport.name);
        freezeTransport();
      }
    }
  
    // Remove all listeners on the transport and on self
    function cleanup () {
      transport.removeListener('open', onTransportOpen);
      transport.removeListener('error', onerror);
      transport.removeListener('close', onTransportClose);
      self.removeListener('close', onclose);
      self.removeListener('upgrading', onupgrade);
    }
  
    transport.once('open', onTransportOpen);
    transport.once('error', onerror);
    transport.once('close', onTransportClose);
  
    this.once('close', onclose);
    this.once('upgrading', onupgrade);
  
    transport.open();
  };
  
  /**
   * Called when connection is deemed open.
   *
   * @api public
   */
  
  Socket.prototype.onOpen = function () {
    debug('socket open');
    this.readyState = 'open';
    Socket.priorWebsocketSuccess = 'websocket' === this.transport.name;
    this.emit('open');
    this.flush();
  
    // we check for `readyState` in case an `open`
    // listener already closed the socket
    if ('open' === this.readyState && this.upgrade && this.transport.pause) {
      debug('starting upgrade probes');
      for (var i = 0, l = this.upgrades.length; i < l; i++) {
        this.probe(this.upgrades[i]);
      }
    }
  };
  
  /**
   * Handles a packet.
   *
   * @api private
   */
  
  Socket.prototype.onPacket = function (packet) {
    if ('opening' === this.readyState || 'open' === this.readyState ||
        'closing' === this.readyState) {
      debug('socket receive: type "%s", data "%s"', packet.type, packet.data);
  
      this.emit('packet', packet);
  
      // Socket is live - any packet counts
      this.emit('heartbeat');
  
      switch (packet.type) {
        case 'open':
          this.onHandshake(JSON.parse(packet.data));
          break;
  
        case 'pong':
          this.setPing();
          this.emit('pong');
          break;
  
        case 'error':
          var err = new Error('server error');
          err.code = packet.data;
          this.onError(err);
          break;
  
        case 'message':
          this.emit('data', packet.data);
          this.emit('message', packet.data);
          break;
      }
    } else {
      debug('packet received with socket readyState "%s"', this.readyState);
    }
  };
  
  /**
   * Called upon handshake completion.
   *
   * @param {Object} handshake obj
   * @api private
   */
  
  Socket.prototype.onHandshake = function (data) {
    this.emit('handshake', data);
    this.id = data.sid;
    this.transport.query.sid = data.sid;
    this.upgrades = this.filterUpgrades(data.upgrades);
    this.pingInterval = data.pingInterval;
    this.pingTimeout = data.pingTimeout;
    this.onOpen();
    // In case open handler closes socket
    if ('closed' === this.readyState) return;
    this.setPing();
  
    // Prolong liveness of socket on heartbeat
    this.removeListener('heartbeat', this.onHeartbeat);
    this.on('heartbeat', this.onHeartbeat);
  };
  
  /**
   * Resets ping timeout.
   *
   * @api private
   */
  
  Socket.prototype.onHeartbeat = function (timeout) {
    clearTimeout(this.pingTimeoutTimer);
    var self = this;
    self.pingTimeoutTimer = setTimeout(function () {
      if ('closed' === self.readyState) return;
      self.onClose('ping timeout');
    }, timeout || (self.pingInterval + self.pingTimeout));
  };
  
  /**
   * Pings server every `this.pingInterval` and expects response
   * within `this.pingTimeout` or closes connection.
   *
   * @api private
   */
  
  Socket.prototype.setPing = function () {
    var self = this;
    clearTimeout(self.pingIntervalTimer);
    self.pingIntervalTimer = setTimeout(function () {
      debug('writing ping packet - expecting pong within %sms', self.pingTimeout);
      self.ping();
      self.onHeartbeat(self.pingTimeout);
    }, self.pingInterval);
  };
  
  /**
  * Sends a ping packet.
  *
  * @api private
  */
  
  Socket.prototype.ping = function () {
    var self = this;
    this.sendPacket('ping', function () {
      self.emit('ping');
    });
  };
  
  /**
   * Called on `drain` event
   *
   * @api private
   */
  
  Socket.prototype.onDrain = function () {
    this.writeBuffer.splice(0, this.prevBufferLen);
  
    // setting prevBufferLen = 0 is very important
    // for example, when upgrading, upgrade packet is sent over,
    // and a nonzero prevBufferLen could cause problems on `drain`
    this.prevBufferLen = 0;
  
    if (0 === this.writeBuffer.length) {
      this.emit('drain');
    } else {
      this.flush();
    }
  };
  
  /**
   * Flush write buffers.
   *
   * @api private
   */
  
  Socket.prototype.flush = function () {
    if ('closed' !== this.readyState && this.transport.writable &&
      !this.upgrading && this.writeBuffer.length) {
      debug('flushing %d packets in socket', this.writeBuffer.length);
      this.transport.send(this.writeBuffer);
      // keep track of current length of writeBuffer
      // splice writeBuffer and callbackBuffer on `drain`
      this.prevBufferLen = this.writeBuffer.length;
      this.emit('flush');
    }
  };
  
  /**
   * Sends a message.
   *
   * @param {String} message.
   * @param {Function} callback function.
   * @param {Object} options.
   * @return {Socket} for chaining.
   * @api public
   */
  
  Socket.prototype.write =
  Socket.prototype.send = function (msg, options, fn) {
    this.sendPacket('message', msg, options, fn);
    return this;
  };
  
  /**
   * Sends a packet.
   *
   * @param {String} packet type.
   * @param {String} data.
   * @param {Object} options.
   * @param {Function} callback function.
   * @api private
   */
  
  Socket.prototype.sendPacket = function (type, data, options, fn) {
    if ('function' === typeof data) {
      fn = data;
      data = undefined;
    }
  
    if ('function' === typeof options) {
      fn = options;
      options = null;
    }
  
    if ('closing' === this.readyState || 'closed' === this.readyState) {
      return;
    }
  
    options = options || {};
    options.compress = false !== options.compress;
  
    var packet = {
      type: type,
      data: data,
      options: options
    };
    this.emit('packetCreate', packet);
    this.writeBuffer.push(packet);
    if (fn) this.once('flush', fn);
    this.flush();
  };
  
  /**
   * Closes the connection.
   *
   * @api private
   */
  
  Socket.prototype.close = function () {
    if ('opening' === this.readyState || 'open' === this.readyState) {
      this.readyState = 'closing';
  
      var self = this;
  
      if (this.writeBuffer.length) {
        this.once('drain', function () {
          if (this.upgrading) {
            waitForUpgrade();
          } else {
            close();
          }
        });
      } else if (this.upgrading) {
        waitForUpgrade();
      } else {
        close();
      }
    }
  
    function close () {
      self.onClose('forced close');
      debug('socket closing - telling transport to close');
      self.transport.close();
    }
  
    function cleanupAndClose () {
      self.removeListener('upgrade', cleanupAndClose);
      self.removeListener('upgradeError', cleanupAndClose);
      close();
    }
  
    function waitForUpgrade () {
      // wait for upgrade to finish since we can't send packets while pausing a transport
      self.once('upgrade', cleanupAndClose);
      self.once('upgradeError', cleanupAndClose);
    }
  
    return this;
  };
  
  /**
   * Called upon transport error
   *
   * @api private
   */
  
  Socket.prototype.onError = function (err) {
    debug('socket error %j', err);
    Socket.priorWebsocketSuccess = false;
    this.emit('error', err);
    this.onClose('transport error', err);
  };
  
  /**
   * Called upon transport close.
   *
   * @api private
   */
  
  Socket.prototype.onClose = function (reason, desc) {
    if ('opening' === this.readyState || 'open' === this.readyState || 'closing' === this.readyState) {
      debug('socket close with reason: "%s"', reason);
      var self = this;
  
      // clear timers
      clearTimeout(this.pingIntervalTimer);
      clearTimeout(this.pingTimeoutTimer);
  
      // stop event from firing again for transport
      this.transport.removeAllListeners('close');
  
      // ensure transport won't stay open
      this.transport.close();
  
      // ignore further transport communication
      this.transport.removeAllListeners();
  
      // set ready state
      this.readyState = 'closed';
  
      // clear session id
      this.id = null;
  
      // emit close event
      this.emit('close', reason, desc);
  
      // clean buffers after, so users can still
      // grab the buffers on `close` event
      self.writeBuffer = [];
      self.prevBufferLen = 0;
    }
  };
  
  /**
   * Filters upgrades, returning only those matching client transports.
   *
   * @param {Array} server upgrades
   * @api private
   *
   */
  
  Socket.prototype.filterUpgrades = function (upgrades) {
    var filteredUpgrades = [];
    for (var i = 0, j = upgrades.length; i < j; i++) {
      if (~index(this.transports, upgrades[i])) filteredUpgrades.push(upgrades[i]);
    }
    return filteredUpgrades;
  };
  
  },{"./transport":17,"./transports/index":18,"component-emitter":12,"debug":24,"engine.io-parser":26,"indexof":37,"parseqs":75,"parseuri":76}],17:[function(require,module,exports){
  /**
   * Module dependencies.
   */
  
  var parser = require('engine.io-parser');
  var Emitter = require('component-emitter');
  
  /**
   * Module exports.
   */
  
  module.exports = Transport;
  
  /**
   * Transport abstract constructor.
   *
   * @param {Object} options.
   * @api private
   */
  
  function Transport (opts) {
    this.path = opts.path;
    this.hostname = opts.hostname;
    this.port = opts.port;
    this.secure = opts.secure;
    this.query = opts.query;
    this.timestampParam = opts.timestampParam;
    this.timestampRequests = opts.timestampRequests;
    this.readyState = '';
    this.agent = opts.agent || false;
    this.socket = opts.socket;
    this.enablesXDR = opts.enablesXDR;
    this.withCredentials = opts.withCredentials;
  
    // SSL options for Node.js client
    this.pfx = opts.pfx;
    this.key = opts.key;
    this.passphrase = opts.passphrase;
    this.cert = opts.cert;
    this.ca = opts.ca;
    this.ciphers = opts.ciphers;
    this.rejectUnauthorized = opts.rejectUnauthorized;
    this.forceNode = opts.forceNode;
  
    // results of ReactNative environment detection
    this.isReactNative = opts.isReactNative;
  
    // other options for Node.js client
    this.extraHeaders = opts.extraHeaders;
    this.localAddress = opts.localAddress;
  }
  
  /**
   * Mix in `Emitter`.
   */
  
  Emitter(Transport.prototype);
  
  /**
   * Emits an error.
   *
   * @param {String} str
   * @return {Transport} for chaining
   * @api public
   */
  
  Transport.prototype.onError = function (msg, desc) {
    var err = new Error(msg);
    err.type = 'TransportError';
    err.description = desc;
    this.emit('error', err);
    return this;
  };
  
  /**
   * Opens the transport.
   *
   * @api public
   */
  
  Transport.prototype.open = function () {
    if ('closed' === this.readyState || '' === this.readyState) {
      this.readyState = 'opening';
      this.doOpen();
    }
  
    return this;
  };
  
  /**
   * Closes the transport.
   *
   * @api private
   */
  
  Transport.prototype.close = function () {
    if ('opening' === this.readyState || 'open' === this.readyState) {
      this.doClose();
      this.onClose();
    }
  
    return this;
  };
  
  /**
   * Sends multiple packets.
   *
   * @param {Array} packets
   * @api private
   */
  
  Transport.prototype.send = function (packets) {
    if ('open' === this.readyState) {
      this.write(packets);
    } else {
      throw new Error('Transport not open');
    }
  };
  
  /**
   * Called upon open
   *
   * @api private
   */
  
  Transport.prototype.onOpen = function () {
    this.readyState = 'open';
    this.writable = true;
    this.emit('open');
  };
  
  /**
   * Called with data.
   *
   * @param {String} data
   * @api private
   */
  
  Transport.prototype.onData = function (data) {
    var packet = parser.decodePacket(data, this.socket.binaryType);
    this.onPacket(packet);
  };
  
  /**
   * Called with a decoded packet.
   */
  
  Transport.prototype.onPacket = function (packet) {
    this.emit('packet', packet);
  };
  
  /**
   * Called upon close.
   *
   * @api private
   */
  
  Transport.prototype.onClose = function () {
    this.readyState = 'closed';
    this.emit('close');
  };
  
  },{"component-emitter":12,"engine.io-parser":26}],18:[function(require,module,exports){
  /**
   * Module dependencies
   */
  
  var XMLHttpRequest = require('xmlhttprequest-ssl');
  var XHR = require('./polling-xhr');
  var JSONP = require('./polling-jsonp');
  var websocket = require('./websocket');
  
  /**
   * Export transports.
   */
  
  exports.polling = polling;
  exports.websocket = websocket;
  
  /**
   * Polling transport polymorphic constructor.
   * Decides on xhr vs jsonp based on feature detection.
   *
   * @api private
   */
  
  function polling (opts) {
    var xhr;
    var xd = false;
    var xs = false;
    var jsonp = false !== opts.jsonp;
  
    if (typeof location !== 'undefined') {
      var isSSL = 'https:' === location.protocol;
      var port = location.port;
  
      // some user agents have empty `location.port`
      if (!port) {
        port = isSSL ? 443 : 80;
      }
  
      xd = opts.hostname !== location.hostname || port !== opts.port;
      xs = opts.secure !== isSSL;
    }
  
    opts.xdomain = xd;
    opts.xscheme = xs;
    xhr = new XMLHttpRequest(opts);
  
    if ('open' in xhr && !opts.forceJSONP) {
      return new XHR(opts);
    } else {
      if (!jsonp) throw new Error('JSONP disabled');
      return new JSONP(opts);
    }
  }
  
  },{"./polling-jsonp":19,"./polling-xhr":20,"./websocket":22,"xmlhttprequest-ssl":23}],19:[function(require,module,exports){
  /**
   * Module requirements.
   */
  
  var Polling = require('./polling');
  var inherit = require('component-inherit');
  var globalThis = require('../globalThis');
  
  /**
   * Module exports.
   */
  
  module.exports = JSONPPolling;
  
  /**
   * Cached regular expressions.
   */
  
  var rNewline = /\n/g;
  var rEscapedNewline = /\\n/g;
  
  /**
   * Global JSONP callbacks.
   */
  
  var callbacks;
  
  /**
   * Noop.
   */
  
  function empty () { }
  
  /**
   * JSONP Polling constructor.
   *
   * @param {Object} opts.
   * @api public
   */
  
  function JSONPPolling (opts) {
    Polling.call(this, opts);
  
    this.query = this.query || {};
  
    // define global callbacks array if not present
    // we do this here (lazily) to avoid unneeded global pollution
    if (!callbacks) {
      // we need to consider multiple engines in the same page
      callbacks = globalThis.___eio = (globalThis.___eio || []);
    }
  
    // callback identifier
    this.index = callbacks.length;
  
    // add callback to jsonp global
    var self = this;
    callbacks.push(function (msg) {
      self.onData(msg);
    });
  
    // append to query string
    this.query.j = this.index;
  
    // prevent spurious errors from being emitted when the window is unloaded
    if (typeof addEventListener === 'function') {
      addEventListener('beforeunload', function () {
        if (self.script) self.script.onerror = empty;
      }, false);
    }
  }
  
  /**
   * Inherits from Polling.
   */
  
  inherit(JSONPPolling, Polling);
  
  /*
   * JSONP only supports binary as base64 encoded strings
   */
  
  JSONPPolling.prototype.supportsBinary = false;
  
  /**
   * Closes the socket.
   *
   * @api private
   */
  
  JSONPPolling.prototype.doClose = function () {
    if (this.script) {
      this.script.parentNode.removeChild(this.script);
      this.script = null;
    }
  
    if (this.form) {
      this.form.parentNode.removeChild(this.form);
      this.form = null;
      this.iframe = null;
    }
  
    Polling.prototype.doClose.call(this);
  };
  
  /**
   * Starts a poll cycle.
   *
   * @api private
   */
  
  JSONPPolling.prototype.doPoll = function () {
    var self = this;
    var script = document.createElement('script');
  
    if (this.script) {
      this.script.parentNode.removeChild(this.script);
      this.script = null;
    }
  
    script.async = true;
    script.src = this.uri();
    script.onerror = function (e) {
      self.onError('jsonp poll error', e);
    };
  
    var insertAt = document.getElementsByTagName('script')[0];
    if (insertAt) {
      insertAt.parentNode.insertBefore(script, insertAt);
    } else {
      (document.head || document.body).appendChild(script);
    }
    this.script = script;
  
    var isUAgecko = 'undefined' !== typeof navigator && /gecko/i.test(navigator.userAgent);
  
    if (isUAgecko) {
      setTimeout(function () {
        var iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        document.body.removeChild(iframe);
      }, 100);
    }
  };
  
  /**
   * Writes with a hidden iframe.
   *
   * @param {String} data to send
   * @param {Function} called upon flush.
   * @api private
   */
  
  JSONPPolling.prototype.doWrite = function (data, fn) {
    var self = this;
  
    if (!this.form) {
      var form = document.createElement('form');
      var area = document.createElement('textarea');
      var id = this.iframeId = 'eio_iframe_' + this.index;
      var iframe;
  
      form.className = 'socketio';
      form.style.position = 'absolute';
      form.style.top = '-1000px';
      form.style.left = '-1000px';
      form.target = id;
      form.method = 'POST';
      form.setAttribute('accept-charset', 'utf-8');
      area.name = 'd';
      form.appendChild(area);
      document.body.appendChild(form);
  
      this.form = form;
      this.area = area;
    }
  
    this.form.action = this.uri();
  
    function complete () {
      initIframe();
      fn();
    }
  
    function initIframe () {
      if (self.iframe) {
        try {
          self.form.removeChild(self.iframe);
        } catch (e) {
          self.onError('jsonp polling iframe removal error', e);
        }
      }
  
      try {
        // ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
        var html = '<iframe src="javascript:0" name="' + self.iframeId + '">';
        iframe = document.createElement(html);
      } catch (e) {
        iframe = document.createElement('iframe');
        iframe.name = self.iframeId;
        iframe.src = 'javascript:0';
      }
  
      iframe.id = self.iframeId;
  
      self.form.appendChild(iframe);
      self.iframe = iframe;
    }
  
    initIframe();
  
    // escape \n to prevent it from being converted into \r\n by some UAs
    // double escaping is required for escaped new lines because unescaping of new lines can be done safely on server-side
    data = data.replace(rEscapedNewline, '\\\n');
    this.area.value = data.replace(rNewline, '\\n');
  
    try {
      this.form.submit();
    } catch (e) {}
  
    if (this.iframe.attachEvent) {
      this.iframe.onreadystatechange = function () {
        if (self.iframe.readyState === 'complete') {
          complete();
        }
      };
    } else {
      this.iframe.onload = complete;
    }
  };
  
  },{"../globalThis":14,"./polling":21,"component-inherit":13}],20:[function(require,module,exports){
  /* global attachEvent */
  
  /**
   * Module requirements.
   */
  
  var XMLHttpRequest = require('xmlhttprequest-ssl');
  var Polling = require('./polling');
  var Emitter = require('component-emitter');
  var inherit = require('component-inherit');
  var debug = require('debug')('engine.io-client:polling-xhr');
  var globalThis = require('../globalThis');
  
  /**
   * Module exports.
   */
  
  module.exports = XHR;
  module.exports.Request = Request;
  
  /**
   * Empty function
   */
  
  function empty () {}
  
  /**
   * XHR Polling constructor.
   *
   * @param {Object} opts
   * @api public
   */
  
  function XHR (opts) {
    Polling.call(this, opts);
    this.requestTimeout = opts.requestTimeout;
    this.extraHeaders = opts.extraHeaders;
  
    if (typeof location !== 'undefined') {
      var isSSL = 'https:' === location.protocol;
      var port = location.port;
  
      // some user agents have empty `location.port`
      if (!port) {
        port = isSSL ? 443 : 80;
      }
  
      this.xd = (typeof location !== 'undefined' && opts.hostname !== location.hostname) ||
        port !== opts.port;
      this.xs = opts.secure !== isSSL;
    }
  }
  
  /**
   * Inherits from Polling.
   */
  
  inherit(XHR, Polling);
  
  /**
   * XHR supports binary
   */
  
  XHR.prototype.supportsBinary = true;
  
  /**
   * Creates a request.
   *
   * @param {String} method
   * @api private
   */
  
  XHR.prototype.request = function (opts) {
    opts = opts || {};
    opts.uri = this.uri();
    opts.xd = this.xd;
    opts.xs = this.xs;
    opts.agent = this.agent || false;
    opts.supportsBinary = this.supportsBinary;
    opts.enablesXDR = this.enablesXDR;
    opts.withCredentials = this.withCredentials;
  
    // SSL options for Node.js client
    opts.pfx = this.pfx;
    opts.key = this.key;
    opts.passphrase = this.passphrase;
    opts.cert = this.cert;
    opts.ca = this.ca;
    opts.ciphers = this.ciphers;
    opts.rejectUnauthorized = this.rejectUnauthorized;
    opts.requestTimeout = this.requestTimeout;
  
    // other options for Node.js client
    opts.extraHeaders = this.extraHeaders;
  
    return new Request(opts);
  };
  
  /**
   * Sends data.
   *
   * @param {String} data to send.
   * @param {Function} called upon flush.
   * @api private
   */
  
  XHR.prototype.doWrite = function (data, fn) {
    var isBinary = typeof data !== 'string' && data !== undefined;
    var req = this.request({ method: 'POST', data: data, isBinary: isBinary });
    var self = this;
    req.on('success', fn);
    req.on('error', function (err) {
      self.onError('xhr post error', err);
    });
    this.sendXhr = req;
  };
  
  /**
   * Starts a poll cycle.
   *
   * @api private
   */
  
  XHR.prototype.doPoll = function () {
    debug('xhr poll');
    var req = this.request();
    var self = this;
    req.on('data', function (data) {
      self.onData(data);
    });
    req.on('error', function (err) {
      self.onError('xhr poll error', err);
    });
    this.pollXhr = req;
  };
  
  /**
   * Request constructor
   *
   * @param {Object} options
   * @api public
   */
  
  function Request (opts) {
    this.method = opts.method || 'GET';
    this.uri = opts.uri;
    this.xd = !!opts.xd;
    this.xs = !!opts.xs;
    this.async = false !== opts.async;
    this.data = undefined !== opts.data ? opts.data : null;
    this.agent = opts.agent;
    this.isBinary = opts.isBinary;
    this.supportsBinary = opts.supportsBinary;
    this.enablesXDR = opts.enablesXDR;
    this.withCredentials = opts.withCredentials;
    this.requestTimeout = opts.requestTimeout;
  
    // SSL options for Node.js client
    this.pfx = opts.pfx;
    this.key = opts.key;
    this.passphrase = opts.passphrase;
    this.cert = opts.cert;
    this.ca = opts.ca;
    this.ciphers = opts.ciphers;
    this.rejectUnauthorized = opts.rejectUnauthorized;
  
    // other options for Node.js client
    this.extraHeaders = opts.extraHeaders;
  
    this.create();
  }
  
  /**
   * Mix in `Emitter`.
   */
  
  Emitter(Request.prototype);
  
  /**
   * Creates the XHR object and sends the request.
   *
   * @api private
   */
  
  Request.prototype.create = function () {
    var opts = { agent: this.agent, xdomain: this.xd, xscheme: this.xs, enablesXDR: this.enablesXDR };
  
    // SSL options for Node.js client
    opts.pfx = this.pfx;
    opts.key = this.key;
    opts.passphrase = this.passphrase;
    opts.cert = this.cert;
    opts.ca = this.ca;
    opts.ciphers = this.ciphers;
    opts.rejectUnauthorized = this.rejectUnauthorized;
  
    var xhr = this.xhr = new XMLHttpRequest(opts);
    var self = this;
  
    try {
      debug('xhr open %s: %s', this.method, this.uri);
      xhr.open(this.method, this.uri, this.async);
      try {
        if (this.extraHeaders) {
          xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);
          for (var i in this.extraHeaders) {
            if (this.extraHeaders.hasOwnProperty(i)) {
              xhr.setRequestHeader(i, this.extraHeaders[i]);
            }
          }
        }
      } catch (e) {}
  
      if ('POST' === this.method) {
        try {
          if (this.isBinary) {
            xhr.setRequestHeader('Content-type', 'application/octet-stream');
          } else {
            xhr.setRequestHeader('Content-type', 'text/plain;charset=UTF-8');
          }
        } catch (e) {}
      }
  
      try {
        xhr.setRequestHeader('Accept', '*/*');
      } catch (e) {}
  
      // ie6 check
      if ('withCredentials' in xhr) {
        xhr.withCredentials = this.withCredentials;
      }
  
      if (this.requestTimeout) {
        xhr.timeout = this.requestTimeout;
      }
  
      if (this.hasXDR()) {
        xhr.onload = function () {
          self.onLoad();
        };
        xhr.onerror = function () {
          self.onError(xhr.responseText);
        };
      } else {
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 2) {
            try {
              var contentType = xhr.getResponseHeader('Content-Type');
              if (self.supportsBinary && contentType === 'application/octet-stream' || contentType === 'application/octet-stream; charset=UTF-8') {
                xhr.responseType = 'arraybuffer';
              }
            } catch (e) {}
          }
          if (4 !== xhr.readyState) return;
          if (200 === xhr.status || 1223 === xhr.status) {
            self.onLoad();
          } else {
            // make sure the `error` event handler that's user-set
            // does not throw in the same tick and gets caught here
            setTimeout(function () {
              self.onError(typeof xhr.status === 'number' ? xhr.status : 0);
            }, 0);
          }
        };
      }
  
      debug('xhr data %s', this.data);
      xhr.send(this.data);
    } catch (e) {
      // Need to defer since .create() is called directly fhrom the constructor
      // and thus the 'error' event can only be only bound *after* this exception
      // occurs.  Therefore, also, we cannot throw here at all.
      setTimeout(function () {
        self.onError(e);
      }, 0);
      return;
    }
  
    if (typeof document !== 'undefined') {
      this.index = Request.requestsCount++;
      Request.requests[this.index] = this;
    }
  };
  
  /**
   * Called upon successful response.
   *
   * @api private
   */
  
  Request.prototype.onSuccess = function () {
    this.emit('success');
    this.cleanup();
  };
  
  /**
   * Called if we have data.
   *
   * @api private
   */
  
  Request.prototype.onData = function (data) {
    this.emit('data', data);
    this.onSuccess();
  };
  
  /**
   * Called upon error.
   *
   * @api private
   */
  
  Request.prototype.onError = function (err) {
    this.emit('error', err);
    this.cleanup(true);
  };
  
  /**
   * Cleans up house.
   *
   * @api private
   */
  
  Request.prototype.cleanup = function (fromError) {
    if ('undefined' === typeof this.xhr || null === this.xhr) {
      return;
    }
    // xmlhttprequest
    if (this.hasXDR()) {
      this.xhr.onload = this.xhr.onerror = empty;
    } else {
      this.xhr.onreadystatechange = empty;
    }
  
    if (fromError) {
      try {
        this.xhr.abort();
      } catch (e) {}
    }
  
    if (typeof document !== 'undefined') {
      delete Request.requests[this.index];
    }
  
    this.xhr = null;
  };
  
  /**
   * Called upon load.
   *
   * @api private
   */
  
  Request.prototype.onLoad = function () {
    var data;
    try {
      var contentType;
      try {
        contentType = this.xhr.getResponseHeader('Content-Type');
      } catch (e) {}
      if (contentType === 'application/octet-stream' || contentType === 'application/octet-stream; charset=UTF-8') {
        data = this.xhr.response || this.xhr.responseText;
      } else {
        data = this.xhr.responseText;
      }
    } catch (e) {
      this.onError(e);
    }
    if (null != data) {
      this.onData(data);
    }
  };
  
  /**
   * Check if it has XDomainRequest.
   *
   * @api private
   */
  
  Request.prototype.hasXDR = function () {
    return typeof XDomainRequest !== 'undefined' && !this.xs && this.enablesXDR;
  };
  
  /**
   * Aborts the request.
   *
   * @api public
   */
  
  Request.prototype.abort = function () {
    this.cleanup();
  };
  
  /**
   * Aborts pending requests when unloading the window. This is needed to prevent
   * memory leaks (e.g. when using IE) and to ensure that no spurious error is
   * emitted.
   */
  
  Request.requestsCount = 0;
  Request.requests = {};
  
  if (typeof document !== 'undefined') {
    if (typeof attachEvent === 'function') {
      attachEvent('onunload', unloadHandler);
    } else if (typeof addEventListener === 'function') {
      var terminationEvent = 'onpagehide' in globalThis ? 'pagehide' : 'unload';
      addEventListener(terminationEvent, unloadHandler, false);
    }
  }
  
  function unloadHandler () {
    for (var i in Request.requests) {
      if (Request.requests.hasOwnProperty(i)) {
        Request.requests[i].abort();
      }
    }
  }
  
  },{"../globalThis":14,"./polling":21,"component-emitter":12,"component-inherit":13,"debug":24,"xmlhttprequest-ssl":23}],21:[function(require,module,exports){
  /**
   * Module dependencies.
   */
  
  var Transport = require('../transport');
  var parseqs = require('parseqs');
  var parser = require('engine.io-parser');
  var inherit = require('component-inherit');
  var yeast = require('yeast');
  var debug = require('debug')('engine.io-client:polling');
  
  /**
   * Module exports.
   */
  
  module.exports = Polling;
  
  /**
   * Is XHR2 supported?
   */
  
  var hasXHR2 = (function () {
    var XMLHttpRequest = require('xmlhttprequest-ssl');
    var xhr = new XMLHttpRequest({ xdomain: false });
    return null != xhr.responseType;
  })();
  
  /**
   * Polling interface.
   *
   * @param {Object} opts
   * @api private
   */
  
  function Polling (opts) {
    var forceBase64 = (opts && opts.forceBase64);
    if (!hasXHR2 || forceBase64) {
      this.supportsBinary = false;
    }
    Transport.call(this, opts);
  }
  
  /**
   * Inherits from Transport.
   */
  
  inherit(Polling, Transport);
  
  /**
   * Transport name.
   */
  
  Polling.prototype.name = 'polling';
  
  /**
   * Opens the socket (triggers polling). We write a PING message to determine
   * when the transport is open.
   *
   * @api private
   */
  
  Polling.prototype.doOpen = function () {
    this.poll();
  };
  
  /**
   * Pauses polling.
   *
   * @param {Function} callback upon buffers are flushed and transport is paused
   * @api private
   */
  
  Polling.prototype.pause = function (onPause) {
    var self = this;
  
    this.readyState = 'pausing';
  
    function pause () {
      debug('paused');
      self.readyState = 'paused';
      onPause();
    }
  
    if (this.polling || !this.writable) {
      var total = 0;
  
      if (this.polling) {
        debug('we are currently polling - waiting to pause');
        total++;
        this.once('pollComplete', function () {
          debug('pre-pause polling complete');
          --total || pause();
        });
      }
  
      if (!this.writable) {
        debug('we are currently writing - waiting to pause');
        total++;
        this.once('drain', function () {
          debug('pre-pause writing complete');
          --total || pause();
        });
      }
    } else {
      pause();
    }
  };
  
  /**
   * Starts polling cycle.
   *
   * @api public
   */
  
  Polling.prototype.poll = function () {
    debug('polling');
    this.polling = true;
    this.doPoll();
    this.emit('poll');
  };
  
  /**
   * Overloads onData to detect payloads.
   *
   * @api private
   */
  
  Polling.prototype.onData = function (data) {
    var self = this;
    debug('polling got data %s', data);
    var callback = function (packet, index, total) {
      // if its the first message we consider the transport open
      if ('opening' === self.readyState && packet.type === 'open') {
        self.onOpen();
      }
  
      // if its a close packet, we close the ongoing requests
      if ('close' === packet.type) {
        self.onClose();
        return false;
      }
  
      // otherwise bypass onData and handle the message
      self.onPacket(packet);
    };
  
    // decode payload
    parser.decodePayload(data, this.socket.binaryType, callback);
  
    // if an event did not trigger closing
    if ('closed' !== this.readyState) {
      // if we got data we're not polling
      this.polling = false;
      this.emit('pollComplete');
  
      if ('open' === this.readyState) {
        this.poll();
      } else {
        debug('ignoring poll - transport state "%s"', this.readyState);
      }
    }
  };
  
  /**
   * For polling, send a close packet.
   *
   * @api private
   */
  
  Polling.prototype.doClose = function () {
    var self = this;
  
    function close () {
      debug('writing close packet');
      self.write([{ type: 'close' }]);
    }
  
    if ('open' === this.readyState) {
      debug('transport open - closing');
      close();
    } else {
      // in case we're trying to close while
      // handshaking is in progress (GH-164)
      debug('transport not open - deferring close');
      this.once('open', close);
    }
  };
  
  /**
   * Writes a packets payload.
   *
   * @param {Array} data packets
   * @param {Function} drain callback
   * @api private
   */
  
  Polling.prototype.write = function (packets) {
    var self = this;
    this.writable = false;
    var callbackfn = function () {
      self.writable = true;
      self.emit('drain');
    };
  
    parser.encodePayload(packets, this.supportsBinary, function (data) {
      self.doWrite(data, callbackfn);
    });
  };
  
  /**
   * Generates uri for connection.
   *
   * @api private
   */
  
  Polling.prototype.uri = function () {
    var query = this.query || {};
    var schema = this.secure ? 'https' : 'http';
    var port = '';
  
    // cache busting is forced
    if (false !== this.timestampRequests) {
      query[this.timestampParam] = yeast();
    }
  
    if (!this.supportsBinary && !query.sid) {
      query.b64 = 1;
    }
  
    query = parseqs.encode(query);
  
    // avoid port if default for schema
    if (this.port && (('https' === schema && Number(this.port) !== 443) ||
       ('http' === schema && Number(this.port) !== 80))) {
      port = ':' + this.port;
    }
  
    // prepend ? to query
    if (query.length) {
      query = '?' + query;
    }
  
    var ipv6 = this.hostname.indexOf(':') !== -1;
    return schema + '://' + (ipv6 ? '[' + this.hostname + ']' : this.hostname) + port + this.path + query;
  };
  
  },{"../transport":17,"component-inherit":13,"debug":24,"engine.io-parser":26,"parseqs":75,"xmlhttprequest-ssl":23,"yeast":93}],22:[function(require,module,exports){
  (function (Buffer){(function (){
  /**
   * Module dependencies.
   */
  
  var Transport = require('../transport');
  var parser = require('engine.io-parser');
  var parseqs = require('parseqs');
  var inherit = require('component-inherit');
  var yeast = require('yeast');
  var debug = require('debug')('engine.io-client:websocket');
  
  var BrowserWebSocket, NodeWebSocket;
  
  if (typeof WebSocket !== 'undefined') {
    BrowserWebSocket = WebSocket;
  } else if (typeof self !== 'undefined') {
    BrowserWebSocket = self.WebSocket || self.MozWebSocket;
  }
  
  if (typeof window === 'undefined') {
    try {
      NodeWebSocket = require('ws');
    } catch (e) { }
  }
  
  /**
   * Get either the `WebSocket` or `MozWebSocket` globals
   * in the browser or try to resolve WebSocket-compatible
   * interface exposed by `ws` for Node-like environment.
   */
  
  var WebSocketImpl = BrowserWebSocket || NodeWebSocket;
  
  /**
   * Module exports.
   */
  
  module.exports = WS;
  
  /**
   * WebSocket transport constructor.
   *
   * @api {Object} connection options
   * @api public
   */
  
  function WS (opts) {
    var forceBase64 = (opts && opts.forceBase64);
    if (forceBase64) {
      this.supportsBinary = false;
    }
    this.perMessageDeflate = opts.perMessageDeflate;
    this.usingBrowserWebSocket = BrowserWebSocket && !opts.forceNode;
    this.protocols = opts.protocols;
    if (!this.usingBrowserWebSocket) {
      WebSocketImpl = NodeWebSocket;
    }
    Transport.call(this, opts);
  }
  
  /**
   * Inherits from Transport.
   */
  
  inherit(WS, Transport);
  
  /**
   * Transport name.
   *
   * @api public
   */
  
  WS.prototype.name = 'websocket';
  
  /*
   * WebSockets support binary
   */
  
  WS.prototype.supportsBinary = true;
  
  /**
   * Opens socket.
   *
   * @api private
   */
  
  WS.prototype.doOpen = function () {
    if (!this.check()) {
      // let probe timeout
      return;
    }
  
    var uri = this.uri();
    var protocols = this.protocols;
  
    var opts = {};
  
    if (!this.isReactNative) {
      opts.agent = this.agent;
      opts.perMessageDeflate = this.perMessageDeflate;
  
      // SSL options for Node.js client
      opts.pfx = this.pfx;
      opts.key = this.key;
      opts.passphrase = this.passphrase;
      opts.cert = this.cert;
      opts.ca = this.ca;
      opts.ciphers = this.ciphers;
      opts.rejectUnauthorized = this.rejectUnauthorized;
    }
  
    if (this.extraHeaders) {
      opts.headers = this.extraHeaders;
    }
    if (this.localAddress) {
      opts.localAddress = this.localAddress;
    }
  
    try {
      this.ws =
        this.usingBrowserWebSocket && !this.isReactNative
          ? protocols
            ? new WebSocketImpl(uri, protocols)
            : new WebSocketImpl(uri)
          : new WebSocketImpl(uri, protocols, opts);
    } catch (err) {
      return this.emit('error', err);
    }
  
    if (this.ws.binaryType === undefined) {
      this.supportsBinary = false;
    }
  
    if (this.ws.supports && this.ws.supports.binary) {
      this.supportsBinary = true;
      this.ws.binaryType = 'nodebuffer';
    } else {
      this.ws.binaryType = 'arraybuffer';
    }
  
    this.addEventListeners();
  };
  
  /**
   * Adds event listeners to the socket
   *
   * @api private
   */
  
  WS.prototype.addEventListeners = function () {
    var self = this;
  
    this.ws.onopen = function () {
      self.onOpen();
    };
    this.ws.onclose = function () {
      self.onClose();
    };
    this.ws.onmessage = function (ev) {
      self.onData(ev.data);
    };
    this.ws.onerror = function (e) {
      self.onError('websocket error', e);
    };
  };
  
  /**
   * Writes data to socket.
   *
   * @param {Array} array of packets.
   * @api private
   */
  
  WS.prototype.write = function (packets) {
    var self = this;
    this.writable = false;
  
    // encodePacket efficient as it uses WS framing
    // no need for encodePayload
    var total = packets.length;
    for (var i = 0, l = total; i < l; i++) {
      (function (packet) {
        parser.encodePacket(packet, self.supportsBinary, function (data) {
          if (!self.usingBrowserWebSocket) {
            // always create a new object (GH-437)
            var opts = {};
            if (packet.options) {
              opts.compress = packet.options.compress;
            }
  
            if (self.perMessageDeflate) {
              var len = 'string' === typeof data ? Buffer.byteLength(data) : data.length;
              if (len < self.perMessageDeflate.threshold) {
                opts.compress = false;
              }
            }
          }
  
          // Sometimes the websocket has already been closed but the browser didn't
          // have a chance of informing us about it yet, in that case send will
          // throw an error
          try {
            if (self.usingBrowserWebSocket) {
              // TypeError is thrown when passing the second argument on Safari
              self.ws.send(data);
            } else {
              self.ws.send(data, opts);
            }
          } catch (e) {
            debug('websocket closed before onclose event');
          }
  
          --total || done();
        });
      })(packets[i]);
    }
  
    function done () {
      self.emit('flush');
  
      // fake drain
      // defer to next tick to allow Socket to clear writeBuffer
      setTimeout(function () {
        self.writable = true;
        self.emit('drain');
      }, 0);
    }
  };
  
  /**
   * Called upon close
   *
   * @api private
   */
  
  WS.prototype.onClose = function () {
    Transport.prototype.onClose.call(this);
  };
  
  /**
   * Closes socket.
   *
   * @api private
   */
  
  WS.prototype.doClose = function () {
    if (typeof this.ws !== 'undefined') {
      this.ws.close();
    }
  };
  
  /**
   * Generates uri for connection.
   *
   * @api private
   */
  
  WS.prototype.uri = function () {
    var query = this.query || {};
    var schema = this.secure ? 'wss' : 'ws';
    var port = '';
  
    // avoid port if default for schema
    if (this.port && (('wss' === schema && Number(this.port) !== 443) ||
      ('ws' === schema && Number(this.port) !== 80))) {
      port = ':' + this.port;
    }
  
    // append timestamp to URI
    if (this.timestampRequests) {
      query[this.timestampParam] = yeast();
    }
  
    // communicate binary support capabilities
    if (!this.supportsBinary) {
      query.b64 = 1;
    }
  
    query = parseqs.encode(query);
  
    // prepend ? to query
    if (query.length) {
      query = '?' + query;
    }
  
    var ipv6 = this.hostname.indexOf(':') !== -1;
    return schema + '://' + (ipv6 ? '[' + this.hostname + ']' : this.hostname) + port + this.path + query;
  };
  
  /**
   * Feature detection for WebSocket.
   *
   * @return {Boolean} whether this transport is available.
   * @api public
   */
  
  WS.prototype.check = function () {
    return !!WebSocketImpl && !('__initialize' in WebSocketImpl && this.name === WS.prototype.name);
  };
  
  }).call(this)}).call(this,require("buffer").Buffer)
  },{"../transport":17,"buffer":10,"component-inherit":13,"debug":24,"engine.io-parser":26,"parseqs":75,"ws":9,"yeast":93}],23:[function(require,module,exports){
  // browser shim for xmlhttprequest module
  
  var hasCORS = require('has-cors');
  var globalThis = require('./globalThis');
  
  module.exports = function (opts) {
    var xdomain = opts.xdomain;
  
    // scheme must be same when usign XDomainRequest
    // http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx
    var xscheme = opts.xscheme;
  
    // XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.
    // https://github.com/Automattic/engine.io-client/pull/217
    var enablesXDR = opts.enablesXDR;
  
    // XMLHttpRequest can be disabled on IE
    try {
      if ('undefined' !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
        return new XMLHttpRequest();
      }
    } catch (e) { }
  
    // Use XDomainRequest for IE8 if enablesXDR is true
    // because loading bar keeps flashing when using jsonp-polling
    // https://github.com/yujiosaka/socke.io-ie8-loading-example
    try {
      if ('undefined' !== typeof XDomainRequest && !xscheme && enablesXDR) {
        return new XDomainRequest();
      }
    } catch (e) { }
  
    if (!xdomain) {
      try {
        return new globalThis[['Active'].concat('Object').join('X')]('Microsoft.XMLHTTP');
      } catch (e) { }
    }
  };
  
  },{"./globalThis":14,"has-cors":35}],24:[function(require,module,exports){
  (function (process){(function (){
  /**
   * This is the web browser implementation of `debug()`.
   *
   * Expose `debug()` as the module.
   */
  
  exports = module.exports = require('./debug');
  exports.log = log;
  exports.formatArgs = formatArgs;
  exports.save = save;
  exports.load = load;
  exports.useColors = useColors;
  exports.storage = 'undefined' != typeof chrome
                 && 'undefined' != typeof chrome.storage
                    ? chrome.storage.local
                    : localstorage();
  
  /**
   * Colors.
   */
  
  exports.colors = [
    '#0000CC', '#0000FF', '#0033CC', '#0033FF', '#0066CC', '#0066FF', '#0099CC',
    '#0099FF', '#00CC00', '#00CC33', '#00CC66', '#00CC99', '#00CCCC', '#00CCFF',
    '#3300CC', '#3300FF', '#3333CC', '#3333FF', '#3366CC', '#3366FF', '#3399CC',
    '#3399FF', '#33CC00', '#33CC33', '#33CC66', '#33CC99', '#33CCCC', '#33CCFF',
    '#6600CC', '#6600FF', '#6633CC', '#6633FF', '#66CC00', '#66CC33', '#9900CC',
    '#9900FF', '#9933CC', '#9933FF', '#99CC00', '#99CC33', '#CC0000', '#CC0033',
    '#CC0066', '#CC0099', '#CC00CC', '#CC00FF', '#CC3300', '#CC3333', '#CC3366',
    '#CC3399', '#CC33CC', '#CC33FF', '#CC6600', '#CC6633', '#CC9900', '#CC9933',
    '#CCCC00', '#CCCC33', '#FF0000', '#FF0033', '#FF0066', '#FF0099', '#FF00CC',
    '#FF00FF', '#FF3300', '#FF3333', '#FF3366', '#FF3399', '#FF33CC', '#FF33FF',
    '#FF6600', '#FF6633', '#FF9900', '#FF9933', '#FFCC00', '#FFCC33'
  ];
  
  /**
   * Currently only WebKit-based Web Inspectors, Firefox >= v31,
   * and the Firebug extension (any Firefox version) are known
   * to support "%c" CSS customizations.
   *
   * TODO: add a `localStorage` variable to explicitly enable/disable colors
   */
  
  function useColors() {
    // NB: In an Electron preload script, document will be defined but not fully
    // initialized. Since we know we're in Chrome, we'll just detect this case
    // explicitly
    if (typeof window !== 'undefined' && window.process && window.process.type === 'renderer') {
      return true;
    }
  
    // Internet Explorer and Edge do not support colors.
    if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)) {
      return false;
    }
  
    // is webkit? http://stackoverflow.com/a/16459606/376773
    // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
    return (typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance) ||
      // is firebug? http://stackoverflow.com/a/398120/376773
      (typeof window !== 'undefined' && window.console && (window.console.firebug || (window.console.exception && window.console.table))) ||
      // is firefox >= v31?
      // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
      (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31) ||
      // double check webkit in userAgent just in case we are in a worker
      (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/));
  }
  
  /**
   * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
   */
  
  exports.formatters.j = function(v) {
    try {
      return JSON.stringify(v);
    } catch (err) {
      return '[UnexpectedJSONParseError]: ' + err.message;
    }
  };
  
  
  /**
   * Colorize log arguments if enabled.
   *
   * @api public
   */
  
  function formatArgs(args) {
    var useColors = this.useColors;
  
    args[0] = (useColors ? '%c' : '')
      + this.namespace
      + (useColors ? ' %c' : ' ')
      + args[0]
      + (useColors ? '%c ' : ' ')
      + '+' + exports.humanize(this.diff);
  
    if (!useColors) return;
  
    var c = 'color: ' + this.color;
    args.splice(1, 0, c, 'color: inherit')
  
    // the final "%c" is somewhat tricky, because there could be other
    // arguments passed either before or after the %c, so we need to
    // figure out the correct index to insert the CSS into
    var index = 0;
    var lastC = 0;
    args[0].replace(/%[a-zA-Z%]/g, function(match) {
      if ('%%' === match) return;
      index++;
      if ('%c' === match) {
        // we only are interested in the *last* %c
        // (the user may have provided their own)
        lastC = index;
      }
    });
  
    args.splice(lastC, 0, c);
  }
  
  /**
   * Invokes `console.log()` when available.
   * No-op when `console.log` is not a "function".
   *
   * @api public
   */
  
  function log() {
    // this hackery is required for IE8/9, where
    // the `console.log` function doesn't have 'apply'
    return 'object' === typeof console
      && console.log
      && Function.prototype.apply.call(console.log, console, arguments);
  }
  
  /**
   * Save `namespaces`.
   *
   * @param {String} namespaces
   * @api private
   */
  
  function save(namespaces) {
    try {
      if (null == namespaces) {
        exports.storage.removeItem('debug');
      } else {
        exports.storage.debug = namespaces;
      }
    } catch(e) {}
  }
  
  /**
   * Load `namespaces`.
   *
   * @return {String} returns the previously persisted debug modes
   * @api private
   */
  
  function load() {
    var r;
    try {
      r = exports.storage.debug;
    } catch(e) {}
  
    // If debug isn't set in LS, and we're in Electron, try to load $DEBUG
    if (!r && typeof process !== 'undefined' && 'env' in process) {
      r = process.env.DEBUG;
    }
  
    return r;
  }
  
  /**
   * Enable namespaces listed in `localStorage.debug` initially.
   */
  
  exports.enable(load());
  
  /**
   * Localstorage attempts to return the localstorage.
   *
   * This is necessary because safari throws
   * when a user disables cookies/localstorage
   * and you attempt to access it.
   *
   * @return {LocalStorage}
   * @api private
   */
  
  function localstorage() {
    try {
      return window.localStorage;
    } catch (e) {}
  }
  
  }).call(this)}).call(this,require('_process'))
  },{"./debug":25,"_process":77}],25:[function(require,module,exports){
  
  /**
   * This is the common logic for both the Node.js and web browser
   * implementations of `debug()`.
   *
   * Expose `debug()` as the module.
   */
  
  exports = module.exports = createDebug.debug = createDebug['default'] = createDebug;
  exports.coerce = coerce;
  exports.disable = disable;
  exports.enable = enable;
  exports.enabled = enabled;
  exports.humanize = require('ms');
  
  /**
   * Active `debug` instances.
   */
  exports.instances = [];
  
  /**
   * The currently active debug mode names, and names to skip.
   */
  
  exports.names = [];
  exports.skips = [];
  
  /**
   * Map of special "%n" handling functions, for the debug "format" argument.
   *
   * Valid key names are a single, lower or upper-case letter, i.e. "n" and "N".
   */
  
  exports.formatters = {};
  
  /**
   * Select a color.
   * @param {String} namespace
   * @return {Number}
   * @api private
   */
  
  function selectColor(namespace) {
    var hash = 0, i;
  
    for (i in namespace) {
      hash  = ((hash << 5) - hash) + namespace.charCodeAt(i);
      hash |= 0; // Convert to 32bit integer
    }
  
    return exports.colors[Math.abs(hash) % exports.colors.length];
  }
  
  /**
   * Create a debugger with the given `namespace`.
   *
   * @param {String} namespace
   * @return {Function}
   * @api public
   */
  
  function createDebug(namespace) {
  
    var prevTime;
  
    function debug() {
      // disabled?
      if (!debug.enabled) return;
  
      var self = debug;
  
      // set `diff` timestamp
      var curr = +new Date();
      var ms = curr - (prevTime || curr);
      self.diff = ms;
      self.prev = prevTime;
      self.curr = curr;
      prevTime = curr;
  
      // turn the `arguments` into a proper Array
      var args = new Array(arguments.length);
      for (var i = 0; i < args.length; i++) {
        args[i] = arguments[i];
      }
  
      args[0] = exports.coerce(args[0]);
  
      if ('string' !== typeof args[0]) {
        // anything else let's inspect with %O
        args.unshift('%O');
      }
  
      // apply any `formatters` transformations
      var index = 0;
      args[0] = args[0].replace(/%([a-zA-Z%])/g, function(match, format) {
        // if we encounter an escaped % then don't increase the array index
        if (match === '%%') return match;
        index++;
        var formatter = exports.formatters[format];
        if ('function' === typeof formatter) {
          var val = args[index];
          match = formatter.call(self, val);
  
          // now we need to remove `args[index]` since it's inlined in the `format`
          args.splice(index, 1);
          index--;
        }
        return match;
      });
  
      // apply env-specific formatting (colors, etc.)
      exports.formatArgs.call(self, args);
  
      var logFn = debug.log || exports.log || console.log.bind(console);
      logFn.apply(self, args);
    }
  
    debug.namespace = namespace;
    debug.enabled = exports.enabled(namespace);
    debug.useColors = exports.useColors();
    debug.color = selectColor(namespace);
    debug.destroy = destroy;
  
    // env-specific initialization logic for debug instances
    if ('function' === typeof exports.init) {
      exports.init(debug);
    }
  
    exports.instances.push(debug);
  
    return debug;
  }
  
  function destroy () {
    var index = exports.instances.indexOf(this);
    if (index !== -1) {
      exports.instances.splice(index, 1);
      return true;
    } else {
      return false;
    }
  }
  
  /**
   * Enables a debug mode by namespaces. This can include modes
   * separated by a colon and wildcards.
   *
   * @param {String} namespaces
   * @api public
   */
  
  function enable(namespaces) {
    exports.save(namespaces);
  
    exports.names = [];
    exports.skips = [];
  
    var i;
    var split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);
    var len = split.length;
  
    for (i = 0; i < len; i++) {
      if (!split[i]) continue; // ignore empty strings
      namespaces = split[i].replace(/\*/g, '.*?');
      if (namespaces[0] === '-') {
        exports.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
      } else {
        exports.names.push(new RegExp('^' + namespaces + '$'));
      }
    }
  
    for (i = 0; i < exports.instances.length; i++) {
      var instance = exports.instances[i];
      instance.enabled = exports.enabled(instance.namespace);
    }
  }
  
  /**
   * Disable debug output.
   *
   * @api public
   */
  
  function disable() {
    exports.enable('');
  }
  
  /**
   * Returns true if the given mode name is enabled, false otherwise.
   *
   * @param {String} name
   * @return {Boolean}
   * @api public
   */
  
  function enabled(name) {
    if (name[name.length - 1] === '*') {
      return true;
    }
    var i, len;
    for (i = 0, len = exports.skips.length; i < len; i++) {
      if (exports.skips[i].test(name)) {
        return false;
      }
    }
    for (i = 0, len = exports.names.length; i < len; i++) {
      if (exports.names[i].test(name)) {
        return true;
      }
    }
    return false;
  }
  
  /**
   * Coerce `val`.
   *
   * @param {Mixed} val
   * @return {Mixed}
   * @api private
   */
  
  function coerce(val) {
    if (val instanceof Error) return val.stack || val.message;
    return val;
  }
  
  },{"ms":74}],26:[function(require,module,exports){
  /**
   * Module dependencies.
   */
  
  var keys = require('./keys');
  var hasBinary = require('has-binary2');
  var sliceBuffer = require('arraybuffer.slice');
  var after = require('after');
  var utf8 = require('./utf8');
  
  var base64encoder;
  if (typeof ArrayBuffer !== 'undefined') {
    base64encoder = require('base64-arraybuffer');
  }
  
  /**
   * Check if we are running an android browser. That requires us to use
   * ArrayBuffer with polling transports...
   *
   * http://ghinda.net/jpeg-blob-ajax-android/
   */
  
  var isAndroid = typeof navigator !== 'undefined' && /Android/i.test(navigator.userAgent);
  
  /**
   * Check if we are running in PhantomJS.
   * Uploading a Blob with PhantomJS does not work correctly, as reported here:
   * https://github.com/ariya/phantomjs/issues/11395
   * @type boolean
   */
  var isPhantomJS = typeof navigator !== 'undefined' && /PhantomJS/i.test(navigator.userAgent);
  
  /**
   * When true, avoids using Blobs to encode payloads.
   * @type boolean
   */
  var dontSendBlobs = isAndroid || isPhantomJS;
  
  /**
   * Current protocol version.
   */
  
  exports.protocol = 3;
  
  /**
   * Packet types.
   */
  
  var packets = exports.packets = {
      open:     0    // non-ws
    , close:    1    // non-ws
    , ping:     2
    , pong:     3
    , message:  4
    , upgrade:  5
    , noop:     6
  };
  
  var packetslist = keys(packets);
  
  /**
   * Premade error packet.
   */
  
  var err = { type: 'error', data: 'parser error' };
  
  /**
   * Create a blob api even for blob builder when vendor prefixes exist
   */
  
  var Blob = require('blob');
  
  /**
   * Encodes a packet.
   *
   *     <packet type id> [ <data> ]
   *
   * Example:
   *
   *     5hello world
   *     3
   *     4
   *
   * Binary is encoded in an identical principle
   *
   * @api private
   */
  
  exports.encodePacket = function (packet, supportsBinary, utf8encode, callback) {
    if (typeof supportsBinary === 'function') {
      callback = supportsBinary;
      supportsBinary = false;
    }
  
    if (typeof utf8encode === 'function') {
      callback = utf8encode;
      utf8encode = null;
    }
  
    var data = (packet.data === undefined)
      ? undefined
      : packet.data.buffer || packet.data;
  
    if (typeof ArrayBuffer !== 'undefined' && data instanceof ArrayBuffer) {
      return encodeArrayBuffer(packet, supportsBinary, callback);
    } else if (typeof Blob !== 'undefined' && data instanceof Blob) {
      return encodeBlob(packet, supportsBinary, callback);
    }
  
    // might be an object with { base64: true, data: dataAsBase64String }
    if (data && data.base64) {
      return encodeBase64Object(packet, callback);
    }
  
    // Sending data as a utf-8 string
    var encoded = packets[packet.type];
  
    // data fragment is optional
    if (undefined !== packet.data) {
      encoded += utf8encode ? utf8.encode(String(packet.data), { strict: false }) : String(packet.data);
    }
  
    return callback('' + encoded);
  
  };
  
  function encodeBase64Object(packet, callback) {
    // packet data is an object { base64: true, data: dataAsBase64String }
    var message = 'b' + exports.packets[packet.type] + packet.data.data;
    return callback(message);
  }
  
  /**
   * Encode packet helpers for binary types
   */
  
  function encodeArrayBuffer(packet, supportsBinary, callback) {
    if (!supportsBinary) {
      return exports.encodeBase64Packet(packet, callback);
    }
  
    var data = packet.data;
    var contentArray = new Uint8Array(data);
    var resultBuffer = new Uint8Array(1 + data.byteLength);
  
    resultBuffer[0] = packets[packet.type];
    for (var i = 0; i < contentArray.length; i++) {
      resultBuffer[i+1] = contentArray[i];
    }
  
    return callback(resultBuffer.buffer);
  }
  
  function encodeBlobAsArrayBuffer(packet, supportsBinary, callback) {
    if (!supportsBinary) {
      return exports.encodeBase64Packet(packet, callback);
    }
  
    var fr = new FileReader();
    fr.onload = function() {
      exports.encodePacket({ type: packet.type, data: fr.result }, supportsBinary, true, callback);
    };
    return fr.readAsArrayBuffer(packet.data);
  }
  
  function encodeBlob(packet, supportsBinary, callback) {
    if (!supportsBinary) {
      return exports.encodeBase64Packet(packet, callback);
    }
  
    if (dontSendBlobs) {
      return encodeBlobAsArrayBuffer(packet, supportsBinary, callback);
    }
  
    var length = new Uint8Array(1);
    length[0] = packets[packet.type];
    var blob = new Blob([length.buffer, packet.data]);
  
    return callback(blob);
  }
  
  /**
   * Encodes a packet with binary data in a base64 string
   *
   * @param {Object} packet, has `type` and `data`
   * @return {String} base64 encoded message
   */
  
  exports.encodeBase64Packet = function(packet, callback) {
    var message = 'b' + exports.packets[packet.type];
    if (typeof Blob !== 'undefined' && packet.data instanceof Blob) {
      var fr = new FileReader();
      fr.onload = function() {
        var b64 = fr.result.split(',')[1];
        callback(message + b64);
      };
      return fr.readAsDataURL(packet.data);
    }
  
    var b64data;
    try {
      b64data = String.fromCharCode.apply(null, new Uint8Array(packet.data));
    } catch (e) {
      // iPhone Safari doesn't let you apply with typed arrays
      var typed = new Uint8Array(packet.data);
      var basic = new Array(typed.length);
      for (var i = 0; i < typed.length; i++) {
        basic[i] = typed[i];
      }
      b64data = String.fromCharCode.apply(null, basic);
    }
    message += btoa(b64data);
    return callback(message);
  };
  
  /**
   * Decodes a packet. Changes format to Blob if requested.
   *
   * @return {Object} with `type` and `data` (if any)
   * @api private
   */
  
  exports.decodePacket = function (data, binaryType, utf8decode) {
    if (data === undefined) {
      return err;
    }
    // String data
    if (typeof data === 'string') {
      if (data.charAt(0) === 'b') {
        return exports.decodeBase64Packet(data.substr(1), binaryType);
      }
  
      if (utf8decode) {
        data = tryDecode(data);
        if (data === false) {
          return err;
        }
      }
      var type = data.charAt(0);
  
      if (Number(type) != type || !packetslist[type]) {
        return err;
      }
  
      if (data.length > 1) {
        return { type: packetslist[type], data: data.substring(1) };
      } else {
        return { type: packetslist[type] };
      }
    }
  
    var asArray = new Uint8Array(data);
    var type = asArray[0];
    var rest = sliceBuffer(data, 1);
    if (Blob && binaryType === 'blob') {
      rest = new Blob([rest]);
    }
    return { type: packetslist[type], data: rest };
  };
  
  function tryDecode(data) {
    try {
      data = utf8.decode(data, { strict: false });
    } catch (e) {
      return false;
    }
    return data;
  }
  
  /**
   * Decodes a packet encoded in a base64 string
   *
   * @param {String} base64 encoded message
   * @return {Object} with `type` and `data` (if any)
   */
  
  exports.decodeBase64Packet = function(msg, binaryType) {
    var type = packetslist[msg.charAt(0)];
    if (!base64encoder) {
      return { type: type, data: { base64: true, data: msg.substr(1) } };
    }
  
    var data = base64encoder.decode(msg.substr(1));
  
    if (binaryType === 'blob' && Blob) {
      data = new Blob([data]);
    }
  
    return { type: type, data: data };
  };
  
  /**
   * Encodes multiple messages (payload).
   *
   *     <length>:data
   *
   * Example:
   *
   *     11:hello world2:hi
   *
   * If any contents are binary, they will be encoded as base64 strings. Base64
   * encoded strings are marked with a b before the length specifier
   *
   * @param {Array} packets
   * @api private
   */
  
  exports.encodePayload = function (packets, supportsBinary, callback) {
    if (typeof supportsBinary === 'function') {
      callback = supportsBinary;
      supportsBinary = null;
    }
  
    var isBinary = hasBinary(packets);
  
    if (supportsBinary && isBinary) {
      if (Blob && !dontSendBlobs) {
        return exports.encodePayloadAsBlob(packets, callback);
      }
  
      return exports.encodePayloadAsArrayBuffer(packets, callback);
    }
  
    if (!packets.length) {
      return callback('0:');
    }
  
    function setLengthHeader(message) {
      return message.length + ':' + message;
    }
  
    function encodeOne(packet, doneCallback) {
      exports.encodePacket(packet, !isBinary ? false : supportsBinary, false, function(message) {
        doneCallback(null, setLengthHeader(message));
      });
    }
  
    map(packets, encodeOne, function(err, results) {
      return callback(results.join(''));
    });
  };
  
  /**
   * Async array map using after
   */
  
  function map(ary, each, done) {
    var result = new Array(ary.length);
    var next = after(ary.length, done);
  
    var eachWithIndex = function(i, el, cb) {
      each(el, function(error, msg) {
        result[i] = msg;
        cb(error, result);
      });
    };
  
    for (var i = 0; i < ary.length; i++) {
      eachWithIndex(i, ary[i], next);
    }
  }
  
  /*
   * Decodes data when a payload is maybe expected. Possible binary contents are
   * decoded from their base64 representation
   *
   * @param {String} data, callback method
   * @api public
   */
  
  exports.decodePayload = function (data, binaryType, callback) {
    if (typeof data !== 'string') {
      return exports.decodePayloadAsBinary(data, binaryType, callback);
    }
  
    if (typeof binaryType === 'function') {
      callback = binaryType;
      binaryType = null;
    }
  
    var packet;
    if (data === '') {
      // parser error - ignoring payload
      return callback(err, 0, 1);
    }
  
    var length = '', n, msg;
  
    for (var i = 0, l = data.length; i < l; i++) {
      var chr = data.charAt(i);
  
      if (chr !== ':') {
        length += chr;
        continue;
      }
  
      if (length === '' || (length != (n = Number(length)))) {
        // parser error - ignoring payload
        return callback(err, 0, 1);
      }
  
      msg = data.substr(i + 1, n);
  
      if (length != msg.length) {
        // parser error - ignoring payload
        return callback(err, 0, 1);
      }
  
      if (msg.length) {
        packet = exports.decodePacket(msg, binaryType, false);
  
        if (err.type === packet.type && err.data === packet.data) {
          // parser error in individual packet - ignoring payload
          return callback(err, 0, 1);
        }
  
        var ret = callback(packet, i + n, l);
        if (false === ret) return;
      }
  
      // advance cursor
      i += n;
      length = '';
    }
  
    if (length !== '') {
      // parser error - ignoring payload
      return callback(err, 0, 1);
    }
  
  };
  
  /**
   * Encodes multiple messages (payload) as binary.
   *
   * <1 = binary, 0 = string><number from 0-9><number from 0-9>[...]<number
   * 255><data>
   *
   * Example:
   * 1 3 255 1 2 3, if the binary contents are interpreted as 8 bit integers
   *
   * @param {Array} packets
   * @return {ArrayBuffer} encoded payload
   * @api private
   */
  
  exports.encodePayloadAsArrayBuffer = function(packets, callback) {
    if (!packets.length) {
      return callback(new ArrayBuffer(0));
    }
  
    function encodeOne(packet, doneCallback) {
      exports.encodePacket(packet, true, true, function(data) {
        return doneCallback(null, data);
      });
    }
  
    map(packets, encodeOne, function(err, encodedPackets) {
      var totalLength = encodedPackets.reduce(function(acc, p) {
        var len;
        if (typeof p === 'string'){
          len = p.length;
        } else {
          len = p.byteLength;
        }
        return acc + len.toString().length + len + 2; // string/binary identifier + separator = 2
      }, 0);
  
      var resultArray = new Uint8Array(totalLength);
  
      var bufferIndex = 0;
      encodedPackets.forEach(function(p) {
        var isString = typeof p === 'string';
        var ab = p;
        if (isString) {
          var view = new Uint8Array(p.length);
          for (var i = 0; i < p.length; i++) {
            view[i] = p.charCodeAt(i);
          }
          ab = view.buffer;
        }
  
        if (isString) { // not true binary
          resultArray[bufferIndex++] = 0;
        } else { // true binary
          resultArray[bufferIndex++] = 1;
        }
  
        var lenStr = ab.byteLength.toString();
        for (var i = 0; i < lenStr.length; i++) {
          resultArray[bufferIndex++] = parseInt(lenStr[i]);
        }
        resultArray[bufferIndex++] = 255;
  
        var view = new Uint8Array(ab);
        for (var i = 0; i < view.length; i++) {
          resultArray[bufferIndex++] = view[i];
        }
      });
  
      return callback(resultArray.buffer);
    });
  };
  
  /**
   * Encode as Blob
   */
  
  exports.encodePayloadAsBlob = function(packets, callback) {
    function encodeOne(packet, doneCallback) {
      exports.encodePacket(packet, true, true, function(encoded) {
        var binaryIdentifier = new Uint8Array(1);
        binaryIdentifier[0] = 1;
        if (typeof encoded === 'string') {
          var view = new Uint8Array(encoded.length);
          for (var i = 0; i < encoded.length; i++) {
            view[i] = encoded.charCodeAt(i);
          }
          encoded = view.buffer;
          binaryIdentifier[0] = 0;
        }
  
        var len = (encoded instanceof ArrayBuffer)
          ? encoded.byteLength
          : encoded.size;
  
        var lenStr = len.toString();
        var lengthAry = new Uint8Array(lenStr.length + 1);
        for (var i = 0; i < lenStr.length; i++) {
          lengthAry[i] = parseInt(lenStr[i]);
        }
        lengthAry[lenStr.length] = 255;
  
        if (Blob) {
          var blob = new Blob([binaryIdentifier.buffer, lengthAry.buffer, encoded]);
          doneCallback(null, blob);
        }
      });
    }
  
    map(packets, encodeOne, function(err, results) {
      return callback(new Blob(results));
    });
  };
  
  /*
   * Decodes data when a payload is maybe expected. Strings are decoded by
   * interpreting each byte as a key code for entries marked to start with 0. See
   * description of encodePayloadAsBinary
   *
   * @param {ArrayBuffer} data, callback method
   * @api public
   */
  
  exports.decodePayloadAsBinary = function (data, binaryType, callback) {
    if (typeof binaryType === 'function') {
      callback = binaryType;
      binaryType = null;
    }
  
    var bufferTail = data;
    var buffers = [];
  
    while (bufferTail.byteLength > 0) {
      var tailArray = new Uint8Array(bufferTail);
      var isString = tailArray[0] === 0;
      var msgLength = '';
  
      for (var i = 1; ; i++) {
        if (tailArray[i] === 255) break;
  
        // 310 = char length of Number.MAX_VALUE
        if (msgLength.length > 310) {
          return callback(err, 0, 1);
        }
  
        msgLength += tailArray[i];
      }
  
      bufferTail = sliceBuffer(bufferTail, 2 + msgLength.length);
      msgLength = parseInt(msgLength);
  
      var msg = sliceBuffer(bufferTail, 0, msgLength);
      if (isString) {
        try {
          msg = String.fromCharCode.apply(null, new Uint8Array(msg));
        } catch (e) {
          // iPhone Safari doesn't let you apply to typed arrays
          var typed = new Uint8Array(msg);
          msg = '';
          for (var i = 0; i < typed.length; i++) {
            msg += String.fromCharCode(typed[i]);
          }
        }
      }
  
      buffers.push(msg);
      bufferTail = sliceBuffer(bufferTail, msgLength);
    }
  
    var total = buffers.length;
    buffers.forEach(function(buffer, i) {
      callback(exports.decodePacket(buffer, binaryType, true), i, total);
    });
  };
  
  },{"./keys":27,"./utf8":28,"after":1,"arraybuffer.slice":2,"base64-arraybuffer":5,"blob":7,"has-binary2":34}],27:[function(require,module,exports){
  
  /**
   * Gets the keys for an object.
   *
   * @return {Array} keys
   * @api private
   */
  
  module.exports = Object.keys || function keys (obj){
    var arr = [];
    var has = Object.prototype.hasOwnProperty;
  
    for (var i in obj) {
      if (has.call(obj, i)) {
        arr.push(i);
      }
    }
    return arr;
  };
  
  },{}],28:[function(require,module,exports){
  /*! https://mths.be/utf8js v2.1.2 by @mathias */
  
  var stringFromCharCode = String.fromCharCode;
  
  // Taken from https://mths.be/punycode
  function ucs2decode(string) {
    var output = [];
    var counter = 0;
    var length = string.length;
    var value;
    var extra;
    while (counter < length) {
      value = string.charCodeAt(counter++);
      if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
        // high surrogate, and there is a next character
        extra = string.charCodeAt(counter++);
        if ((extra & 0xFC00) == 0xDC00) { // low surrogate
          output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
        } else {
          // unmatched surrogate; only append this code unit, in case the next
          // code unit is the high surrogate of a surrogate pair
          output.push(value);
          counter--;
        }
      } else {
        output.push(value);
      }
    }
    return output;
  }
  
  // Taken from https://mths.be/punycode
  function ucs2encode(array) {
    var length = array.length;
    var index = -1;
    var value;
    var output = '';
    while (++index < length) {
      value = array[index];
      if (value > 0xFFFF) {
        value -= 0x10000;
        output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
        value = 0xDC00 | value & 0x3FF;
      }
      output += stringFromCharCode(value);
    }
    return output;
  }
  
  function checkScalarValue(codePoint, strict) {
    if (codePoint >= 0xD800 && codePoint <= 0xDFFF) {
      if (strict) {
        throw Error(
          'Lone surrogate U+' + codePoint.toString(16).toUpperCase() +
          ' is not a scalar value'
        );
      }
      return false;
    }
    return true;
  }
  /*--------------------------------------------------------------------------*/
  
  function createByte(codePoint, shift) {
    return stringFromCharCode(((codePoint >> shift) & 0x3F) | 0x80);
  }
  
  function encodeCodePoint(codePoint, strict) {
    if ((codePoint & 0xFFFFFF80) == 0) { // 1-byte sequence
      return stringFromCharCode(codePoint);
    }
    var symbol = '';
    if ((codePoint & 0xFFFFF800) == 0) { // 2-byte sequence
      symbol = stringFromCharCode(((codePoint >> 6) & 0x1F) | 0xC0);
    }
    else if ((codePoint & 0xFFFF0000) == 0) { // 3-byte sequence
      if (!checkScalarValue(codePoint, strict)) {
        codePoint = 0xFFFD;
      }
      symbol = stringFromCharCode(((codePoint >> 12) & 0x0F) | 0xE0);
      symbol += createByte(codePoint, 6);
    }
    else if ((codePoint & 0xFFE00000) == 0) { // 4-byte sequence
      symbol = stringFromCharCode(((codePoint >> 18) & 0x07) | 0xF0);
      symbol += createByte(codePoint, 12);
      symbol += createByte(codePoint, 6);
    }
    symbol += stringFromCharCode((codePoint & 0x3F) | 0x80);
    return symbol;
  }
  
  function utf8encode(string, opts) {
    opts = opts || {};
    var strict = false !== opts.strict;
  
    var codePoints = ucs2decode(string);
    var length = codePoints.length;
    var index = -1;
    var codePoint;
    var byteString = '';
    while (++index < length) {
      codePoint = codePoints[index];
      byteString += encodeCodePoint(codePoint, strict);
    }
    return byteString;
  }
  
  /*--------------------------------------------------------------------------*/
  
  function readContinuationByte() {
    if (byteIndex >= byteCount) {
      throw Error('Invalid byte index');
    }
  
    var continuationByte = byteArray[byteIndex] & 0xFF;
    byteIndex++;
  
    if ((continuationByte & 0xC0) == 0x80) {
      return continuationByte & 0x3F;
    }
  
    // If we end up here, it’s not a continuation byte
    throw Error('Invalid continuation byte');
  }
  
  function decodeSymbol(strict) {
    var byte1;
    var byte2;
    var byte3;
    var byte4;
    var codePoint;
  
    if (byteIndex > byteCount) {
      throw Error('Invalid byte index');
    }
  
    if (byteIndex == byteCount) {
      return false;
    }
  
    // Read first byte
    byte1 = byteArray[byteIndex] & 0xFF;
    byteIndex++;
  
    // 1-byte sequence (no continuation bytes)
    if ((byte1 & 0x80) == 0) {
      return byte1;
    }
  
    // 2-byte sequence
    if ((byte1 & 0xE0) == 0xC0) {
      byte2 = readContinuationByte();
      codePoint = ((byte1 & 0x1F) << 6) | byte2;
      if (codePoint >= 0x80) {
        return codePoint;
      } else {
        throw Error('Invalid continuation byte');
      }
    }
  
    // 3-byte sequence (may include unpaired surrogates)
    if ((byte1 & 0xF0) == 0xE0) {
      byte2 = readContinuationByte();
      byte3 = readContinuationByte();
      codePoint = ((byte1 & 0x0F) << 12) | (byte2 << 6) | byte3;
      if (codePoint >= 0x0800) {
        return checkScalarValue(codePoint, strict) ? codePoint : 0xFFFD;
      } else {
        throw Error('Invalid continuation byte');
      }
    }
  
    // 4-byte sequence
    if ((byte1 & 0xF8) == 0xF0) {
      byte2 = readContinuationByte();
      byte3 = readContinuationByte();
      byte4 = readContinuationByte();
      codePoint = ((byte1 & 0x07) << 0x12) | (byte2 << 0x0C) |
        (byte3 << 0x06) | byte4;
      if (codePoint >= 0x010000 && codePoint <= 0x10FFFF) {
        return codePoint;
      }
    }
  
    throw Error('Invalid UTF-8 detected');
  }
  
  var byteArray;
  var byteCount;
  var byteIndex;
  function utf8decode(byteString, opts) {
    opts = opts || {};
    var strict = false !== opts.strict;
  
    byteArray = ucs2decode(byteString);
    byteCount = byteArray.length;
    byteIndex = 0;
    var codePoints = [];
    var tmp;
    while ((tmp = decodeSymbol(strict)) !== false) {
      codePoints.push(tmp);
    }
    return ucs2encode(codePoints);
  }
  
  module.exports = {
    version: '2.1.2',
    encode: utf8encode,
    decode: utf8decode
  };
  
  },{}],29:[function(require,module,exports){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  
  var R = typeof Reflect === 'object' ? Reflect : null
  var ReflectApply = R && typeof R.apply === 'function'
    ? R.apply
    : function ReflectApply(target, receiver, args) {
      return Function.prototype.apply.call(target, receiver, args);
    }
  
  var ReflectOwnKeys
  if (R && typeof R.ownKeys === 'function') {
    ReflectOwnKeys = R.ownKeys
  } else if (Object.getOwnPropertySymbols) {
    ReflectOwnKeys = function ReflectOwnKeys(target) {
      return Object.getOwnPropertyNames(target)
        .concat(Object.getOwnPropertySymbols(target));
    };
  } else {
    ReflectOwnKeys = function ReflectOwnKeys(target) {
      return Object.getOwnPropertyNames(target);
    };
  }
  
  function ProcessEmitWarning(warning) {
    if (console && console.warn) console.warn(warning);
  }
  
  var NumberIsNaN = Number.isNaN || function NumberIsNaN(value) {
    return value !== value;
  }
  
  function EventEmitter() {
    EventEmitter.init.call(this);
  }
  module.exports = EventEmitter;
  module.exports.once = once;
  
  // Backwards-compat with node 0.10.x
  EventEmitter.EventEmitter = EventEmitter;
  
  EventEmitter.prototype._events = undefined;
  EventEmitter.prototype._eventsCount = 0;
  EventEmitter.prototype._maxListeners = undefined;
  
  // By default EventEmitters will print a warning if more than 10 listeners are
  // added to it. This is a useful default which helps finding memory leaks.
  var defaultMaxListeners = 10;
  
  function checkListener(listener) {
    if (typeof listener !== 'function') {
      throw new TypeError('The "listener" argument must be of type Function. Received type ' + typeof listener);
    }
  }
  
  Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
    enumerable: true,
    get: function() {
      return defaultMaxListeners;
    },
    set: function(arg) {
      if (typeof arg !== 'number' || arg < 0 || NumberIsNaN(arg)) {
        throw new RangeError('The value of "defaultMaxListeners" is out of range. It must be a non-negative number. Received ' + arg + '.');
      }
      defaultMaxListeners = arg;
    }
  });
  
  EventEmitter.init = function() {
  
    if (this._events === undefined ||
        this._events === Object.getPrototypeOf(this)._events) {
      this._events = Object.create(null);
      this._eventsCount = 0;
    }
  
    this._maxListeners = this._maxListeners || undefined;
  };
  
  // Obviously not all Emitters should be limited to 10. This function allows
  // that to be increased. Set to zero for unlimited.
  EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
    if (typeof n !== 'number' || n < 0 || NumberIsNaN(n)) {
      throw new RangeError('The value of "n" is out of range. It must be a non-negative number. Received ' + n + '.');
    }
    this._maxListeners = n;
    return this;
  };
  
  function _getMaxListeners(that) {
    if (that._maxListeners === undefined)
      return EventEmitter.defaultMaxListeners;
    return that._maxListeners;
  }
  
  EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
    return _getMaxListeners(this);
  };
  
  EventEmitter.prototype.emit = function emit(type) {
    var args = [];
    for (var i = 1; i < arguments.length; i++) args.push(arguments[i]);
    var doError = (type === 'error');
  
    var events = this._events;
    if (events !== undefined)
      doError = (doError && events.error === undefined);
    else if (!doError)
      return false;
  
    // If there is no 'error' event listener then throw.
    if (doError) {
      var er;
      if (args.length > 0)
        er = args[0];
      if (er instanceof Error) {
        // Note: The comments on the `throw` lines are intentional, they show
        // up in Node's output if this results in an unhandled exception.
        throw er; // Unhandled 'error' event
      }
      // At least give some kind of context to the user
      var err = new Error('Unhandled error.' + (er ? ' (' + er.message + ')' : ''));
      err.context = er;
      throw err; // Unhandled 'error' event
    }
  
    var handler = events[type];
  
    if (handler === undefined)
      return false;
  
    if (typeof handler === 'function') {
      ReflectApply(handler, this, args);
    } else {
      var len = handler.length;
      var listeners = arrayClone(handler, len);
      for (var i = 0; i < len; ++i)
        ReflectApply(listeners[i], this, args);
    }
  
    return true;
  };
  
  function _addListener(target, type, listener, prepend) {
    var m;
    var events;
    var existing;
  
    checkListener(listener);
  
    events = target._events;
    if (events === undefined) {
      events = target._events = Object.create(null);
      target._eventsCount = 0;
    } else {
      // To avoid recursion in the case that type === "newListener"! Before
      // adding it to the listeners, first emit "newListener".
      if (events.newListener !== undefined) {
        target.emit('newListener', type,
                    listener.listener ? listener.listener : listener);
  
        // Re-assign `events` because a newListener handler could have caused the
        // this._events to be assigned to a new object
        events = target._events;
      }
      existing = events[type];
    }
  
    if (existing === undefined) {
      // Optimize the case of one listener. Don't need the extra array object.
      existing = events[type] = listener;
      ++target._eventsCount;
    } else {
      if (typeof existing === 'function') {
        // Adding the second element, need to change to array.
        existing = events[type] =
          prepend ? [listener, existing] : [existing, listener];
        // If we've already got an array, just append.
      } else if (prepend) {
        existing.unshift(listener);
      } else {
        existing.push(listener);
      }
  
      // Check for listener leak
      m = _getMaxListeners(target);
      if (m > 0 && existing.length > m && !existing.warned) {
        existing.warned = true;
        // No error code for this since it is a Warning
        // eslint-disable-next-line no-restricted-syntax
        var w = new Error('Possible EventEmitter memory leak detected. ' +
                            existing.length + ' ' + String(type) + ' listeners ' +
                            'added. Use emitter.setMaxListeners() to ' +
                            'increase limit');
        w.name = 'MaxListenersExceededWarning';
        w.emitter = target;
        w.type = type;
        w.count = existing.length;
        ProcessEmitWarning(w);
      }
    }
  
    return target;
  }
  
  EventEmitter.prototype.addListener = function addListener(type, listener) {
    return _addListener(this, type, listener, false);
  };
  
  EventEmitter.prototype.on = EventEmitter.prototype.addListener;
  
  EventEmitter.prototype.prependListener =
      function prependListener(type, listener) {
        return _addListener(this, type, listener, true);
      };
  
  function onceWrapper() {
    if (!this.fired) {
      this.target.removeListener(this.type, this.wrapFn);
      this.fired = true;
      if (arguments.length === 0)
        return this.listener.call(this.target);
      return this.listener.apply(this.target, arguments);
    }
  }
  
  function _onceWrap(target, type, listener) {
    var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
    var wrapped = onceWrapper.bind(state);
    wrapped.listener = listener;
    state.wrapFn = wrapped;
    return wrapped;
  }
  
  EventEmitter.prototype.once = function once(type, listener) {
    checkListener(listener);
    this.on(type, _onceWrap(this, type, listener));
    return this;
  };
  
  EventEmitter.prototype.prependOnceListener =
      function prependOnceListener(type, listener) {
        checkListener(listener);
        this.prependListener(type, _onceWrap(this, type, listener));
        return this;
      };
  
  // Emits a 'removeListener' event if and only if the listener was removed.
  EventEmitter.prototype.removeListener =
      function removeListener(type, listener) {
        var list, events, position, i, originalListener;
  
        checkListener(listener);
  
        events = this._events;
        if (events === undefined)
          return this;
  
        list = events[type];
        if (list === undefined)
          return this;
  
        if (list === listener || list.listener === listener) {
          if (--this._eventsCount === 0)
            this._events = Object.create(null);
          else {
            delete events[type];
            if (events.removeListener)
              this.emit('removeListener', type, list.listener || listener);
          }
        } else if (typeof list !== 'function') {
          position = -1;
  
          for (i = list.length - 1; i >= 0; i--) {
            if (list[i] === listener || list[i].listener === listener) {
              originalListener = list[i].listener;
              position = i;
              break;
            }
          }
  
          if (position < 0)
            return this;
  
          if (position === 0)
            list.shift();
          else {
            spliceOne(list, position);
          }
  
          if (list.length === 1)
            events[type] = list[0];
  
          if (events.removeListener !== undefined)
            this.emit('removeListener', type, originalListener || listener);
        }
  
        return this;
      };
  
  EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
  
  EventEmitter.prototype.removeAllListeners =
      function removeAllListeners(type) {
        var listeners, events, i;
  
        events = this._events;
        if (events === undefined)
          return this;
  
        // not listening for removeListener, no need to emit
        if (events.removeListener === undefined) {
          if (arguments.length === 0) {
            this._events = Object.create(null);
            this._eventsCount = 0;
          } else if (events[type] !== undefined) {
            if (--this._eventsCount === 0)
              this._events = Object.create(null);
            else
              delete events[type];
          }
          return this;
        }
  
        // emit removeListener for all listeners on all events
        if (arguments.length === 0) {
          var keys = Object.keys(events);
          var key;
          for (i = 0; i < keys.length; ++i) {
            key = keys[i];
            if (key === 'removeListener') continue;
            this.removeAllListeners(key);
          }
          this.removeAllListeners('removeListener');
          this._events = Object.create(null);
          this._eventsCount = 0;
          return this;
        }
  
        listeners = events[type];
  
        if (typeof listeners === 'function') {
          this.removeListener(type, listeners);
        } else if (listeners !== undefined) {
          // LIFO order
          for (i = listeners.length - 1; i >= 0; i--) {
            this.removeListener(type, listeners[i]);
          }
        }
  
        return this;
      };
  
  function _listeners(target, type, unwrap) {
    var events = target._events;
  
    if (events === undefined)
      return [];
  
    var evlistener = events[type];
    if (evlistener === undefined)
      return [];
  
    if (typeof evlistener === 'function')
      return unwrap ? [evlistener.listener || evlistener] : [evlistener];
  
    return unwrap ?
      unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);
  }
  
  EventEmitter.prototype.listeners = function listeners(type) {
    return _listeners(this, type, true);
  };
  
  EventEmitter.prototype.rawListeners = function rawListeners(type) {
    return _listeners(this, type, false);
  };
  
  EventEmitter.listenerCount = function(emitter, type) {
    if (typeof emitter.listenerCount === 'function') {
      return emitter.listenerCount(type);
    } else {
      return listenerCount.call(emitter, type);
    }
  };
  
  EventEmitter.prototype.listenerCount = listenerCount;
  function listenerCount(type) {
    var events = this._events;
  
    if (events !== undefined) {
      var evlistener = events[type];
  
      if (typeof evlistener === 'function') {
        return 1;
      } else if (evlistener !== undefined) {
        return evlistener.length;
      }
    }
  
    return 0;
  }
  
  EventEmitter.prototype.eventNames = function eventNames() {
    return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
  };
  
  function arrayClone(arr, n) {
    var copy = new Array(n);
    for (var i = 0; i < n; ++i)
      copy[i] = arr[i];
    return copy;
  }
  
  function spliceOne(list, index) {
    for (; index + 1 < list.length; index++)
      list[index] = list[index + 1];
    list.pop();
  }
  
  function unwrapListeners(arr) {
    var ret = new Array(arr.length);
    for (var i = 0; i < ret.length; ++i) {
      ret[i] = arr[i].listener || arr[i];
    }
    return ret;
  }
  
  function once(emitter, name) {
    return new Promise(function (resolve, reject) {
      function errorListener(err) {
        emitter.removeListener(name, resolver);
        reject(err);
      }
  
      function resolver() {
        if (typeof emitter.removeListener === 'function') {
          emitter.removeListener('error', errorListener);
        }
        resolve([].slice.call(arguments));
      };
  
      eventTargetAgnosticAddListener(emitter, name, resolver, { once: true });
      if (name !== 'error') {
        addErrorHandlerIfEventEmitter(emitter, errorListener, { once: true });
      }
    });
  }
  
  function addErrorHandlerIfEventEmitter(emitter, handler, flags) {
    if (typeof emitter.on === 'function') {
      eventTargetAgnosticAddListener(emitter, 'error', handler, flags);
    }
  }
  
  function eventTargetAgnosticAddListener(emitter, name, listener, flags) {
    if (typeof emitter.on === 'function') {
      if (flags.once) {
        emitter.once(name, listener);
      } else {
        emitter.on(name, listener);
      }
    } else if (typeof emitter.addEventListener === 'function') {
      // EventTarget does not have `error` event semantics like Node
      // EventEmitters, we do not listen for `error` events here.
      emitter.addEventListener(name, function wrapListener(arg) {
        // IE does not have builtin `{ once: true }` support so we
        // have to do it manually.
        if (flags.once) {
          emitter.removeEventListener(name, wrapListener);
        }
        listener(arg);
      });
    } else {
      throw new TypeError('The "emitter" argument must be of type EventEmitter. Received type ' + typeof emitter);
    }
  }
  
  },{}],30:[function(require,module,exports){
  const debug = require('debug')('h264-profile-level-id');
  
  /* eslint-disable no-console */
  debug.log = console.info.bind(console);
  /* eslint-enable no-console */
  
  const ProfileConstrainedBaseline = 1;
  const ProfileBaseline = 2;
  const ProfileMain = 3;
  const ProfileConstrainedHigh = 4;
  const ProfileHigh = 5;
  
  exports.ProfileConstrainedBaseline = ProfileConstrainedBaseline;
  exports.ProfileBaseline = ProfileBaseline;
  exports.ProfileMain = ProfileMain;
  exports.ProfileConstrainedHigh = ProfileConstrainedHigh;
  exports.ProfileHigh = ProfileHigh;
  
  // All values are equal to ten times the level number, except level 1b which is
  // special.
  const Level1_b = 0;
  const Level1 = 10;
  const Level1_1 = 11;
  const Level1_2 = 12;
  const Level1_3 = 13;
  const Level2 = 20;
  const Level2_1 = 21;
  const Level2_2 = 22;
  const Level3 = 30;
  const Level3_1 = 31;
  const Level3_2 = 32;
  const Level4 = 40;
  const Level4_1 = 41;
  const Level4_2 = 42;
  const Level5 = 50;
  const Level5_1 = 51;
  const Level5_2 = 52;
  
  exports.Level1_b = Level1_b;
  exports.Level1 = Level1;
  exports.Level1_1 = Level1_1;
  exports.Level1_2 = Level1_2;
  exports.Level1_3 = Level1_3;
  exports.Level2 = Level2;
  exports.Level2_1 = Level2_1;
  exports.Level2_2 = Level2_2;
  exports.Level3 = Level3;
  exports.Level3_1 = Level3_1;
  exports.Level3_2 = Level3_2;
  exports.Level4 = Level4;
  exports.Level4_1 = Level4_1;
  exports.Level4_2 = Level4_2;
  exports.Level5 = Level5;
  exports.Level5_1 = Level5_1;
  exports.Level5_2 = Level5_2;
  
  class ProfileLevelId
  {
    constructor(profile, level)
    {
      this.profile = profile;
      this.level = level;
    }
  }
  
  exports.ProfileLevelId = ProfileLevelId;
  
  // Default ProfileLevelId.
  //
  // TODO: The default should really be profile Baseline and level 1 according to
  // the spec: https://tools.ietf.org/html/rfc6184#section-8.1. In order to not
  // break backwards compatibility with older versions of WebRTC where external
  // codecs don't have any parameters, use profile ConstrainedBaseline level 3_1
  // instead. This workaround will only be done in an interim period to allow
  // external clients to update their code.
  //
  // http://crbug/webrtc/6337.
  const DefaultProfileLevelId =
    new ProfileLevelId(ProfileConstrainedBaseline, Level3_1);
  
  // For level_idc=11 and profile_idc=0x42, 0x4D, or 0x58, the constraint set3
  // flag specifies if level 1b or level 1.1 is used.
  const ConstraintSet3Flag = 0x10;
  
  // Class for matching bit patterns such as "x1xx0000" where 'x' is allowed to be
  // either 0 or 1.
  class BitPattern
  {
    constructor(str)
    {
      this._mask = ~byteMaskString('x', str);
      this._maskedValue = byteMaskString('1', str);
    }
  
    isMatch(value)
    {
      return this._maskedValue === (value & this._mask);
    }
  }
  
  // Class for converting between profile_idc/profile_iop to Profile.
  class ProfilePattern
  {
    constructor(profile_idc, profile_iop, profile)
    {
      this.profile_idc = profile_idc;
      this.profile_iop = profile_iop;
      this.profile = profile;
    }
  }
  
  // This is from https://tools.ietf.org/html/rfc6184#section-8.1.
  const ProfilePatterns =
  [
    new ProfilePattern(0x42, new BitPattern('x1xx0000'), ProfileConstrainedBaseline),
    new ProfilePattern(0x4D, new BitPattern('1xxx0000'), ProfileConstrainedBaseline),
    new ProfilePattern(0x58, new BitPattern('11xx0000'), ProfileConstrainedBaseline),
    new ProfilePattern(0x42, new BitPattern('x0xx0000'), ProfileBaseline),
    new ProfilePattern(0x58, new BitPattern('10xx0000'), ProfileBaseline),
    new ProfilePattern(0x4D, new BitPattern('0x0x0000'), ProfileMain),
    new ProfilePattern(0x64, new BitPattern('00000000'), ProfileHigh),
    new ProfilePattern(0x64, new BitPattern('00001100'), ProfileConstrainedHigh)
  ];
  
  /**
   * Parse profile level id that is represented as a string of 3 hex bytes.
   * Nothing will be returned if the string is not a recognized H264 profile
   * level id.
   *
   * @param {String} str - profile-level-id value as a string of 3 hex bytes.
   *
   * @returns {ProfileLevelId}
   */
  exports.parseProfileLevelId = function(str)
  {
    // The string should consist of 3 bytes in hexadecimal format.
    if (typeof str !== 'string' || str.length !== 6)
      return null;
  
    const profile_level_id_numeric = parseInt(str, 16);
  
    if (profile_level_id_numeric === 0)
      return null;
  
    // Separate into three bytes.
    const level_idc = profile_level_id_numeric & 0xFF;
    const profile_iop = (profile_level_id_numeric >> 8) & 0xFF;
    const profile_idc = (profile_level_id_numeric >> 16) & 0xFF;
  
    // Parse level based on level_idc and constraint set 3 flag.
    let level;
  
    switch (level_idc)
    {
      case Level1_1:
      {
        level = (profile_iop & ConstraintSet3Flag) !== 0 ? Level1_b : Level1_1;
        break;
      }
      case Level1:
      case Level1_2:
      case Level1_3:
      case Level2:
      case Level2_1:
      case Level2_2:
      case Level3:
      case Level3_1:
      case Level3_2:
      case Level4:
      case Level4_1:
      case Level4_2:
      case Level5:
      case Level5_1:
      case Level5_2:
      {
        level = level_idc;
        break;
      }
      // Unrecognized level_idc.
      default:
      {
        debug('parseProfileLevelId() | unrecognized level_idc:%s', level_idc);
  
        return null;
      }
    }
  
    // Parse profile_idc/profile_iop into a Profile enum.
    for (const pattern of ProfilePatterns)
    {
      if (
        profile_idc === pattern.profile_idc &&
        pattern.profile_iop.isMatch(profile_iop)
      )
      {
        return new ProfileLevelId(pattern.profile, level);
      }
    }
  
    debug('parseProfileLevelId() | unrecognized profile_idc/profile_iop combination');
  
    return null;
  };
  
  /**
   * Returns canonical string representation as three hex bytes of the profile
   * level id, or returns nothing for invalid profile level ids.
   *
   * @param {ProfileLevelId} profile_level_id
   *
   * @returns {String}
   */
  exports.profileLevelIdToString = function(profile_level_id)
  {
    // Handle special case level == 1b.
    if (profile_level_id.level == Level1_b)
    {
      switch (profile_level_id.profile)
      {
        case ProfileConstrainedBaseline:
        {
          return '42f00b';
        }
        case ProfileBaseline:
        {
          return '42100b';
        }
        case ProfileMain:
        {
          return '4d100b';
        }
        // Level 1_b is not allowed for other profiles.
        default:
        {
          debug(
            'profileLevelIdToString() | Level 1_b not is allowed for profile:%s',
            profile_level_id.profile);
  
          return null;
        }
      }
    }
  
    let profile_idc_iop_string;
  
    switch (profile_level_id.profile)
    {
      case ProfileConstrainedBaseline:
      {
        profile_idc_iop_string = '42e0';
        break;
      }
      case ProfileBaseline:
      {
        profile_idc_iop_string = '4200';
        break;
      }
      case ProfileMain:
      {
        profile_idc_iop_string = '4d00';
        break;
      }
      case ProfileConstrainedHigh:
      {
        profile_idc_iop_string = '640c';
        break;
      }
      case ProfileHigh:
      {
        profile_idc_iop_string = '6400';
        break;
      }
      default:
      {
        debug(
          'profileLevelIdToString() | unrecognized profile:%s',
          profile_level_id.profile);
  
        return null;
      }
    }
  
    let levelStr = (profile_level_id.level).toString(16);
  
    if (levelStr.length === 1)
      levelStr = `0${levelStr}`;
  
    return `${profile_idc_iop_string}${levelStr}`;
  };
  
  /**
   * Parse profile level id that is represented as a string of 3 hex bytes
   * contained in an SDP key-value map. A default profile level id will be
   * returned if the profile-level-id key is missing. Nothing will be returned if
   * the key is present but the string is invalid.
   *
   * @param {Object} [params={}] - Codec parameters object.
   *
   * @returns {ProfileLevelId}
   */
  exports.parseSdpProfileLevelId = function(params = {})
  {
    const profile_level_id = params['profile-level-id'];
  
    return !profile_level_id
      ? DefaultProfileLevelId
      : exports.parseProfileLevelId(profile_level_id);
  };
  
  /**
   * Returns true if the parameters have the same H264 profile, i.e. the same
   * H264 profile (Baseline, High, etc).
   *
   * @param {Object} [params1={}] - Codec parameters object.
   * @param {Object} [params2={}] - Codec parameters object.
   *
   * @returns {Boolean}
   */
  exports.isSameProfile = function(params1 = {}, params2 = {})
  {
    const profile_level_id_1 = exports.parseSdpProfileLevelId(params1);
    const profile_level_id_2 = exports.parseSdpProfileLevelId(params2);
  
    // Compare H264 profiles, but not levels.
    return Boolean(
      profile_level_id_1 &&
      profile_level_id_2 &&
      profile_level_id_1.profile === profile_level_id_2.profile
    );
  };
  
  /**
   * Generate codec parameters that will be used as answer in an SDP negotiation
   * based on local supported parameters and remote offered parameters. Both
   * local_supported_params and remote_offered_params represent sendrecv media
   * descriptions, i.e they are a mix of both encode and decode capabilities. In
   * theory, when the profile in local_supported_params represent a strict superset
   * of the profile in remote_offered_params, we could limit the profile in the
   * answer to the profile in remote_offered_params.
   *
   * However, to simplify the code, each supported H264 profile should be listed
   * explicitly in the list of local supported codecs, even if they are redundant.
   * Then each local codec in the list should be tested one at a time against the
   * remote codec, and only when the profiles are equal should this function be
   * called. Therefore, this function does not need to handle profile intersection,
   * and the profile of local_supported_params and remote_offered_params must be
   * equal before calling this function. The parameters that are used when
   * negotiating are the level part of profile-level-id and level-asymmetry-allowed.
   *
   * @param {Object} [local_supported_params={}]
   * @param {Object} [remote_offered_params={}]
   *
   * @returns {String} Canonical string representation as three hex bytes of the
   *   profile level id, or null if no one of the params have profile-level-id.
   *
   * @throws {TypeError} If Profile mismatch or invalid params.
   */
  exports.generateProfileLevelIdForAnswer = function(
    local_supported_params = {},
    remote_offered_params = {}
  )
  {
    // If both local and remote params do not contain profile-level-id, they are
    // both using the default profile. In this case, don't return anything.
    if (
      !local_supported_params['profile-level-id'] &&
      !remote_offered_params['profile-level-id']
    )
    {
      debug(
        'generateProfileLevelIdForAnswer() | no profile-level-id in local and remote params');
  
      return null;
    }
  
    // Parse profile-level-ids.
    const local_profile_level_id =
      exports.parseSdpProfileLevelId(local_supported_params);
    const remote_profile_level_id =
      exports.parseSdpProfileLevelId(remote_offered_params);
  
    // The local and remote codec must have valid and equal H264 Profiles.
    if (!local_profile_level_id)
      throw new TypeError('invalid local_profile_level_id');
  
    if (!remote_profile_level_id)
      throw new TypeError('invalid remote_profile_level_id');
  
    if (local_profile_level_id.profile !== remote_profile_level_id.profile)
      throw new TypeError('H264 Profile mismatch');
  
    // Parse level information.
    const level_asymmetry_allowed = (
      isLevelAsymmetryAllowed(local_supported_params) &&
      isLevelAsymmetryAllowed(remote_offered_params)
    );
  
    const local_level = local_profile_level_id.level;
    const remote_level = remote_profile_level_id.level;
    const min_level = minLevel(local_level, remote_level);
  
    // Determine answer level. When level asymmetry is not allowed, level upgrade
    // is not allowed, i.e., the level in the answer must be equal to or lower
    // than the level in the offer.
    const answer_level = level_asymmetry_allowed ? local_level : min_level;
  
    debug(
      'generateProfileLevelIdForAnswer() | result: [profile:%s, level:%s]',
      local_profile_level_id.profile, answer_level);
  
    // Return the resulting profile-level-id for the answer parameters.
    return exports.profileLevelIdToString(
      new ProfileLevelId(local_profile_level_id.profile, answer_level));
  };
  
  // Convert a string of 8 characters into a byte where the positions containing
  // character c will have their bit set. For example, c = 'x', str = "x1xx0000"
  // will return 0b10110000.
  function byteMaskString(c, str)
  {
    return (
      ((str[0] === c) << 7) | ((str[1] === c) << 6) | ((str[2] === c) << 5) |
      ((str[3] === c) << 4)	| ((str[4] === c) << 3)	| ((str[5] === c) << 2)	|
      ((str[6] === c) << 1)	| ((str[7] === c) << 0)
    );
  }
  
  // Compare H264 levels and handle the level 1b case.
  function isLessLevel(a, b)
  {
    if (a === Level1_b)
      return b !== Level1 && b !== Level1_b;
  
    if (b === Level1_b)
      return a !== Level1;
  
    return a < b;
  }
  
  function minLevel(a, b)
  {
    return isLessLevel(a, b) ? a : b;
  }
  
  function isLevelAsymmetryAllowed(params = {})
  {
    const level_asymmetry_allowed = params['level-asymmetry-allowed'];
  
    return (
      level_asymmetry_allowed === 1 ||
      level_asymmetry_allowed === '1'
    );
  }
  
  },{"debug":31}],31:[function(require,module,exports){
  (function (process){(function (){
  /* eslint-env browser */
  
  /**
   * This is the web browser implementation of `debug()`.
   */
  
  exports.formatArgs = formatArgs;
  exports.save = save;
  exports.load = load;
  exports.useColors = useColors;
  exports.storage = localstorage();
  exports.destroy = (() => {
    let warned = false;
  
    return () => {
      if (!warned) {
        warned = true;
        console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
      }
    };
  })();
  
  /**
   * Colors.
   */
  
  exports.colors = [
    '#0000CC',
    '#0000FF',
    '#0033CC',
    '#0033FF',
    '#0066CC',
    '#0066FF',
    '#0099CC',
    '#0099FF',
    '#00CC00',
    '#00CC33',
    '#00CC66',
    '#00CC99',
    '#00CCCC',
    '#00CCFF',
    '#3300CC',
    '#3300FF',
    '#3333CC',
    '#3333FF',
    '#3366CC',
    '#3366FF',
    '#3399CC',
    '#3399FF',
    '#33CC00',
    '#33CC33',
    '#33CC66',
    '#33CC99',
    '#33CCCC',
    '#33CCFF',
    '#6600CC',
    '#6600FF',
    '#6633CC',
    '#6633FF',
    '#66CC00',
    '#66CC33',
    '#9900CC',
    '#9900FF',
    '#9933CC',
    '#9933FF',
    '#99CC00',
    '#99CC33',
    '#CC0000',
    '#CC0033',
    '#CC0066',
    '#CC0099',
    '#CC00CC',
    '#CC00FF',
    '#CC3300',
    '#CC3333',
    '#CC3366',
    '#CC3399',
    '#CC33CC',
    '#CC33FF',
    '#CC6600',
    '#CC6633',
    '#CC9900',
    '#CC9933',
    '#CCCC00',
    '#CCCC33',
    '#FF0000',
    '#FF0033',
    '#FF0066',
    '#FF0099',
    '#FF00CC',
    '#FF00FF',
    '#FF3300',
    '#FF3333',
    '#FF3366',
    '#FF3399',
    '#FF33CC',
    '#FF33FF',
    '#FF6600',
    '#FF6633',
    '#FF9900',
    '#FF9933',
    '#FFCC00',
    '#FFCC33'
  ];
  
  /**
   * Currently only WebKit-based Web Inspectors, Firefox >= v31,
   * and the Firebug extension (any Firefox version) are known
   * to support "%c" CSS customizations.
   *
   * TODO: add a `localStorage` variable to explicitly enable/disable colors
   */
  
  // eslint-disable-next-line complexity
  function useColors() {
    // NB: In an Electron preload script, document will be defined but not fully
    // initialized. Since we know we're in Chrome, we'll just detect this case
    // explicitly
    if (typeof window !== 'undefined' && window.process && (window.process.type === 'renderer' || window.process.__nwjs)) {
      return true;
    }
  
    // Internet Explorer and Edge do not support colors.
    if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)) {
      return false;
    }
  
    // Is webkit? http://stackoverflow.com/a/16459606/376773
    // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
    return (typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance) ||
      // Is firebug? http://stackoverflow.com/a/398120/376773
      (typeof window !== 'undefined' && window.console && (window.console.firebug || (window.console.exception && window.console.table))) ||
      // Is firefox >= v31?
      // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
      (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31) ||
      // Double check webkit in userAgent just in case we are in a worker
      (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/));
  }
  
  /**
   * Colorize log arguments if enabled.
   *
   * @api public
   */
  
  function formatArgs(args) {
    args[0] = (this.useColors ? '%c' : '') +
      this.namespace +
      (this.useColors ? ' %c' : ' ') +
      args[0] +
      (this.useColors ? '%c ' : ' ') +
      '+' + module.exports.humanize(this.diff);
  
    if (!this.useColors) {
      return;
    }
  
    const c = 'color: ' + this.color;
    args.splice(1, 0, c, 'color: inherit');
  
    // The final "%c" is somewhat tricky, because there could be other
    // arguments passed either before or after the %c, so we need to
    // figure out the correct index to insert the CSS into
    let index = 0;
    let lastC = 0;
    args[0].replace(/%[a-zA-Z%]/g, match => {
      if (match === '%%') {
        return;
      }
      index++;
      if (match === '%c') {
        // We only are interested in the *last* %c
        // (the user may have provided their own)
        lastC = index;
      }
    });
  
    args.splice(lastC, 0, c);
  }
  
  /**
   * Invokes `console.debug()` when available.
   * No-op when `console.debug` is not a "function".
   * If `console.debug` is not available, falls back
   * to `console.log`.
   *
   * @api public
   */
  exports.log = console.debug || console.log || (() => {});
  
  /**
   * Save `namespaces`.
   *
   * @param {String} namespaces
   * @api private
   */
  function save(namespaces) {
    try {
      if (namespaces) {
        exports.storage.setItem('debug', namespaces);
      } else {
        exports.storage.removeItem('debug');
      }
    } catch (error) {
      // Swallow
      // XXX (@Qix-) should we be logging these?
    }
  }
  
  /**
   * Load `namespaces`.
   *
   * @return {String} returns the previously persisted debug modes
   * @api private
   */
  function load() {
    let r;
    try {
      r = exports.storage.getItem('debug');
    } catch (error) {
      // Swallow
      // XXX (@Qix-) should we be logging these?
    }
  
    // If debug isn't set in LS, and we're in Electron, try to load $DEBUG
    if (!r && typeof process !== 'undefined' && 'env' in process) {
      r = process.env.DEBUG;
    }
  
    return r;
  }
  
  /**
   * Localstorage attempts to return the localstorage.
   *
   * This is necessary because safari throws
   * when a user disables cookies/localstorage
   * and you attempt to access it.
   *
   * @return {LocalStorage}
   * @api private
   */
  
  function localstorage() {
    try {
      // TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context
      // The Browser also has localStorage in the global context.
      return localStorage;
    } catch (error) {
      // Swallow
      // XXX (@Qix-) should we be logging these?
    }
  }
  
  module.exports = require('./common')(exports);
  
  const {formatters} = module.exports;
  
  /**
   * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
   */
  
  formatters.j = function (v) {
    try {
      return JSON.stringify(v);
    } catch (error) {
      return '[UnexpectedJSONParseError]: ' + error.message;
    }
  };
  
  }).call(this)}).call(this,require('_process'))
  },{"./common":32,"_process":77}],32:[function(require,module,exports){
  
  /**
   * This is the common logic for both the Node.js and web browser
   * implementations of `debug()`.
   */
  
  function setup(env) {
    createDebug.debug = createDebug;
    createDebug.default = createDebug;
    createDebug.coerce = coerce;
    createDebug.disable = disable;
    createDebug.enable = enable;
    createDebug.enabled = enabled;
    createDebug.humanize = require('ms');
    createDebug.destroy = destroy;
  
    Object.keys(env).forEach(key => {
      createDebug[key] = env[key];
    });
  
    /**
    * The currently active debug mode names, and names to skip.
    */
  
    createDebug.names = [];
    createDebug.skips = [];
  
    /**
    * Map of special "%n" handling functions, for the debug "format" argument.
    *
    * Valid key names are a single, lower or upper-case letter, i.e. "n" and "N".
    */
    createDebug.formatters = {};
  
    /**
    * Selects a color for a debug namespace
    * @param {String} namespace The namespace string for the debug instance to be colored
    * @return {Number|String} An ANSI color code for the given namespace
    * @api private
    */
    function selectColor(namespace) {
      let hash = 0;
  
      for (let i = 0; i < namespace.length; i++) {
        hash = ((hash << 5) - hash) + namespace.charCodeAt(i);
        hash |= 0; // Convert to 32bit integer
      }
  
      return createDebug.colors[Math.abs(hash) % createDebug.colors.length];
    }
    createDebug.selectColor = selectColor;
  
    /**
    * Create a debugger with the given `namespace`.
    *
    * @param {String} namespace
    * @return {Function}
    * @api public
    */
    function createDebug(namespace) {
      let prevTime;
      let enableOverride = null;
      let namespacesCache;
      let enabledCache;
  
      function debug(...args) {
        // Disabled?
        if (!debug.enabled) {
          return;
        }
  
        const self = debug;
  
        // Set `diff` timestamp
        const curr = Number(new Date());
        const ms = curr - (prevTime || curr);
        self.diff = ms;
        self.prev = prevTime;
        self.curr = curr;
        prevTime = curr;
  
        args[0] = createDebug.coerce(args[0]);
  
        if (typeof args[0] !== 'string') {
          // Anything else let's inspect with %O
          args.unshift('%O');
        }
  
        // Apply any `formatters` transformations
        let index = 0;
        args[0] = args[0].replace(/%([a-zA-Z%])/g, (match, format) => {
          // If we encounter an escaped % then don't increase the array index
          if (match === '%%') {
            return '%';
          }
          index++;
          const formatter = createDebug.formatters[format];
          if (typeof formatter === 'function') {
            const val = args[index];
            match = formatter.call(self, val);
  
            // Now we need to remove `args[index]` since it's inlined in the `format`
            args.splice(index, 1);
            index--;
          }
          return match;
        });
  
        // Apply env-specific formatting (colors, etc.)
        createDebug.formatArgs.call(self, args);
  
        const logFn = self.log || createDebug.log;
        logFn.apply(self, args);
      }
  
      debug.namespace = namespace;
      debug.useColors = createDebug.useColors();
      debug.color = createDebug.selectColor(namespace);
      debug.extend = extend;
      debug.destroy = createDebug.destroy; // XXX Temporary. Will be removed in the next major release.
  
      Object.defineProperty(debug, 'enabled', {
        enumerable: true,
        configurable: false,
        get: () => {
          if (enableOverride !== null) {
            return enableOverride;
          }
          if (namespacesCache !== createDebug.namespaces) {
            namespacesCache = createDebug.namespaces;
            enabledCache = createDebug.enabled(namespace);
          }
  
          return enabledCache;
        },
        set: v => {
          enableOverride = v;
        }
      });
  
      // Env-specific initialization logic for debug instances
      if (typeof createDebug.init === 'function') {
        createDebug.init(debug);
      }
  
      return debug;
    }
  
    function extend(namespace, delimiter) {
      const newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);
      newDebug.log = this.log;
      return newDebug;
    }
  
    /**
    * Enables a debug mode by namespaces. This can include modes
    * separated by a colon and wildcards.
    *
    * @param {String} namespaces
    * @api public
    */
    function enable(namespaces) {
      createDebug.save(namespaces);
      createDebug.namespaces = namespaces;
  
      createDebug.names = [];
      createDebug.skips = [];
  
      let i;
      const split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);
      const len = split.length;
  
      for (i = 0; i < len; i++) {
        if (!split[i]) {
          // ignore empty strings
          continue;
        }
  
        namespaces = split[i].replace(/\*/g, '.*?');
  
        if (namespaces[0] === '-') {
          createDebug.skips.push(new RegExp('^' + namespaces.slice(1) + '$'));
        } else {
          createDebug.names.push(new RegExp('^' + namespaces + '$'));
        }
      }
    }
  
    /**
    * Disable debug output.
    *
    * @return {String} namespaces
    * @api public
    */
    function disable() {
      const namespaces = [
        ...createDebug.names.map(toNamespace),
        ...createDebug.skips.map(toNamespace).map(namespace => '-' + namespace)
      ].join(',');
      createDebug.enable('');
      return namespaces;
    }
  
    /**
    * Returns true if the given mode name is enabled, false otherwise.
    *
    * @param {String} name
    * @return {Boolean}
    * @api public
    */
    function enabled(name) {
      if (name[name.length - 1] === '*') {
        return true;
      }
  
      let i;
      let len;
  
      for (i = 0, len = createDebug.skips.length; i < len; i++) {
        if (createDebug.skips[i].test(name)) {
          return false;
        }
      }
  
      for (i = 0, len = createDebug.names.length; i < len; i++) {
        if (createDebug.names[i].test(name)) {
          return true;
        }
      }
  
      return false;
    }
  
    /**
    * Convert regexp to namespace
    *
    * @param {RegExp} regxep
    * @return {String} namespace
    * @api private
    */
    function toNamespace(regexp) {
      return regexp.toString()
        .substring(2, regexp.toString().length - 2)
        .replace(/\.\*\?$/, '*');
    }
  
    /**
    * Coerce `val`.
    *
    * @param {Mixed} val
    * @return {Mixed}
    * @api private
    */
    function coerce(val) {
      if (val instanceof Error) {
        return val.stack || val.message;
      }
      return val;
    }
  
    /**
    * XXX DO NOT USE. This is a temporary stub function.
    * XXX It WILL be removed in the next major release.
    */
    function destroy() {
      console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
    }
  
    createDebug.enable(createDebug.load());
  
    return createDebug;
  }
  
  module.exports = setup;
  
  },{"ms":33}],33:[function(require,module,exports){
  /**
   * Helpers.
   */
  
  var s = 1000;
  var m = s * 60;
  var h = m * 60;
  var d = h * 24;
  var w = d * 7;
  var y = d * 365.25;
  
  /**
   * Parse or format the given `val`.
   *
   * Options:
   *
   *  - `long` verbose formatting [false]
   *
   * @param {String|Number} val
   * @param {Object} [options]
   * @throws {Error} throw an error if val is not a non-empty string or a number
   * @return {String|Number}
   * @api public
   */
  
  module.exports = function(val, options) {
    options = options || {};
    var type = typeof val;
    if (type === 'string' && val.length > 0) {
      return parse(val);
    } else if (type === 'number' && isFinite(val)) {
      return options.long ? fmtLong(val) : fmtShort(val);
    }
    throw new Error(
      'val is not a non-empty string or a valid number. val=' +
        JSON.stringify(val)
    );
  };
  
  /**
   * Parse the given `str` and return milliseconds.
   *
   * @param {String} str
   * @return {Number}
   * @api private
   */
  
  function parse(str) {
    str = String(str);
    if (str.length > 100) {
      return;
    }
    var match = /^(-?(?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec(
      str
    );
    if (!match) {
      return;
    }
    var n = parseFloat(match[1]);
    var type = (match[2] || 'ms').toLowerCase();
    switch (type) {
      case 'years':
      case 'year':
      case 'yrs':
      case 'yr':
      case 'y':
        return n * y;
      case 'weeks':
      case 'week':
      case 'w':
        return n * w;
      case 'days':
      case 'day':
      case 'd':
        return n * d;
      case 'hours':
      case 'hour':
      case 'hrs':
      case 'hr':
      case 'h':
        return n * h;
      case 'minutes':
      case 'minute':
      case 'mins':
      case 'min':
      case 'm':
        return n * m;
      case 'seconds':
      case 'second':
      case 'secs':
      case 'sec':
      case 's':
        return n * s;
      case 'milliseconds':
      case 'millisecond':
      case 'msecs':
      case 'msec':
      case 'ms':
        return n;
      default:
        return undefined;
    }
  }
  
  /**
   * Short format for `ms`.
   *
   * @param {Number} ms
   * @return {String}
   * @api private
   */
  
  function fmtShort(ms) {
    var msAbs = Math.abs(ms);
    if (msAbs >= d) {
      return Math.round(ms / d) + 'd';
    }
    if (msAbs >= h) {
      return Math.round(ms / h) + 'h';
    }
    if (msAbs >= m) {
      return Math.round(ms / m) + 'm';
    }
    if (msAbs >= s) {
      return Math.round(ms / s) + 's';
    }
    return ms + 'ms';
  }
  
  /**
   * Long format for `ms`.
   *
   * @param {Number} ms
   * @return {String}
   * @api private
   */
  
  function fmtLong(ms) {
    var msAbs = Math.abs(ms);
    if (msAbs >= d) {
      return plural(ms, msAbs, d, 'day');
    }
    if (msAbs >= h) {
      return plural(ms, msAbs, h, 'hour');
    }
    if (msAbs >= m) {
      return plural(ms, msAbs, m, 'minute');
    }
    if (msAbs >= s) {
      return plural(ms, msAbs, s, 'second');
    }
    return ms + ' ms';
  }
  
  /**
   * Pluralization helper.
   */
  
  function plural(ms, msAbs, n, name) {
    var isPlural = msAbs >= n * 1.5;
    return Math.round(ms / n) + ' ' + name + (isPlural ? 's' : '');
  }
  
  },{}],34:[function(require,module,exports){
  (function (Buffer){(function (){
  /* global Blob File */
  
  /*
   * Module requirements.
   */
  
  var isArray = require('isarray');
  
  var toString = Object.prototype.toString;
  var withNativeBlob = typeof Blob === 'function' ||
                          typeof Blob !== 'undefined' && toString.call(Blob) === '[object BlobConstructor]';
  var withNativeFile = typeof File === 'function' ||
                          typeof File !== 'undefined' && toString.call(File) === '[object FileConstructor]';
  
  /**
   * Module exports.
   */
  
  module.exports = hasBinary;
  
  /**
   * Checks for binary data.
   *
   * Supports Buffer, ArrayBuffer, Blob and File.
   *
   * @param {Object} anything
   * @api public
   */
  
  function hasBinary (obj) {
    if (!obj || typeof obj !== 'object') {
      return false;
    }
  
    if (isArray(obj)) {
      for (var i = 0, l = obj.length; i < l; i++) {
        if (hasBinary(obj[i])) {
          return true;
        }
      }
      return false;
    }
  
    if ((typeof Buffer === 'function' && Buffer.isBuffer && Buffer.isBuffer(obj)) ||
      (typeof ArrayBuffer === 'function' && obj instanceof ArrayBuffer) ||
      (withNativeBlob && obj instanceof Blob) ||
      (withNativeFile && obj instanceof File)
    ) {
      return true;
    }
  
    // see: https://github.com/Automattic/has-binary/pull/4
    if (obj.toJSON && typeof obj.toJSON === 'function' && arguments.length === 1) {
      return hasBinary(obj.toJSON(), true);
    }
  
    for (var key in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, key) && hasBinary(obj[key])) {
        return true;
      }
    }
  
    return false;
  }
  
  }).call(this)}).call(this,require("buffer").Buffer)
  },{"buffer":10,"isarray":38}],35:[function(require,module,exports){
  
  /**
   * Module exports.
   *
   * Logic borrowed from Modernizr:
   *
   *   - https://github.com/Modernizr/Modernizr/blob/master/feature-detects/cors.js
   */
  
  try {
    module.exports = typeof XMLHttpRequest !== 'undefined' &&
      'withCredentials' in new XMLHttpRequest();
  } catch (err) {
    // if XMLHttp support is disabled in IE then it will throw
    // when trying to create
    module.exports = false;
  }
  
  },{}],36:[function(require,module,exports){
  /*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
  exports.read = function (buffer, offset, isLE, mLen, nBytes) {
    var e, m
    var eLen = (nBytes * 8) - mLen - 1
    var eMax = (1 << eLen) - 1
    var eBias = eMax >> 1
    var nBits = -7
    var i = isLE ? (nBytes - 1) : 0
    var d = isLE ? -1 : 1
    var s = buffer[offset + i]
  
    i += d
  
    e = s & ((1 << (-nBits)) - 1)
    s >>= (-nBits)
    nBits += eLen
    for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}
  
    m = e & ((1 << (-nBits)) - 1)
    e >>= (-nBits)
    nBits += mLen
    for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}
  
    if (e === 0) {
      e = 1 - eBias
    } else if (e === eMax) {
      return m ? NaN : ((s ? -1 : 1) * Infinity)
    } else {
      m = m + Math.pow(2, mLen)
      e = e - eBias
    }
    return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
  }
  
  exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
    var e, m, c
    var eLen = (nBytes * 8) - mLen - 1
    var eMax = (1 << eLen) - 1
    var eBias = eMax >> 1
    var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
    var i = isLE ? 0 : (nBytes - 1)
    var d = isLE ? 1 : -1
    var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
  
    value = Math.abs(value)
  
    if (isNaN(value) || value === Infinity) {
      m = isNaN(value) ? 1 : 0
      e = eMax
    } else {
      e = Math.floor(Math.log(value) / Math.LN2)
      if (value * (c = Math.pow(2, -e)) < 1) {
        e--
        c *= 2
      }
      if (e + eBias >= 1) {
        value += rt / c
      } else {
        value += rt * Math.pow(2, 1 - eBias)
      }
      if (value * c >= 2) {
        e++
        c /= 2
      }
  
      if (e + eBias >= eMax) {
        m = 0
        e = eMax
      } else if (e + eBias >= 1) {
        m = ((value * c) - 1) * Math.pow(2, mLen)
        e = e + eBias
      } else {
        m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
        e = 0
      }
    }
  
    for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
  
    e = (e << mLen) | m
    eLen += mLen
    for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
  
    buffer[offset + i - d] |= s * 128
  }
  
  },{}],37:[function(require,module,exports){
  
  var indexOf = [].indexOf;
  
  module.exports = function(arr, obj){
    if (indexOf) return arr.indexOf(obj);
    for (var i = 0; i < arr.length; ++i) {
      if (arr[i] === obj) return i;
    }
    return -1;
  };
  },{}],38:[function(require,module,exports){
  var toString = {}.toString;
  
  module.exports = Array.isArray || function (arr) {
    return toString.call(arr) == '[object Array]';
  };
  
  },{}],39:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Consumer = void 0;
  const Logger_1 = require("./Logger");
  const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
  const errors_1 = require("./errors");
  const logger = new Logger_1.Logger('Consumer');
  class Consumer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
      constructor({ id, localId, producerId, rtpReceiver, track, rtpParameters, appData }) {
          super();
          // Closed flag.
          this._closed = false;
          // Observer instance.
          this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
          logger.debug('constructor()');
          this._id = id;
          this._localId = localId;
          this._producerId = producerId;
          this._rtpReceiver = rtpReceiver;
          this._track = track;
          this._rtpParameters = rtpParameters;
          this._paused = !track.enabled;
          this._appData = appData || {};
          this._onTrackEnded = this._onTrackEnded.bind(this);
          this._handleTrack();
      }
      /**
       * Consumer id.
       */
      get id() {
          return this._id;
      }
      /**
       * Local id.
       */
      get localId() {
          return this._localId;
      }
      /**
       * Associated Producer id.
       */
      get producerId() {
          return this._producerId;
      }
      /**
       * Whether the Consumer is closed.
       */
      get closed() {
          return this._closed;
      }
      /**
       * Media kind.
       */
      get kind() {
          return this._track.kind;
      }
      /**
       * Associated RTCRtpReceiver.
       */
      get rtpReceiver() {
          return this._rtpReceiver;
      }
      /**
       * The associated track.
       */
      get track() {
          return this._track;
      }
      /**
       * RTP parameters.
       */
      get rtpParameters() {
          return this._rtpParameters;
      }
      /**
       * Whether the Consumer is paused.
       */
      get paused() {
          return this._paused;
      }
      /**
       * App custom data.
       */
      get appData() {
          return this._appData;
      }
      /**
       * Invalid setter.
       */
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      set appData(appData) {
          throw new Error('cannot override appData object');
      }
      get observer() {
          return this._observer;
      }
      /**
       * Closes the Consumer.
       */
      close() {
          if (this._closed)
              return;
          logger.debug('close()');
          this._closed = true;
          this._destroyTrack();
          this.emit('@close');
          // Emit observer event.
          this._observer.safeEmit('close');
      }
      /**
       * Transport was closed.
       */
      transportClosed() {
          if (this._closed)
              return;
          logger.debug('transportClosed()');
          this._closed = true;
          this._destroyTrack();
          this.safeEmit('transportclose');
          // Emit observer event.
          this._observer.safeEmit('close');
      }
      /**
       * Get associated RTCRtpReceiver stats.
       */
      async getStats() {
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          return new Promise((resolve, reject) => {
              this.safeEmit('@getstats', resolve, reject);
          });
      }
      /**
       * Pauses receiving media.
       */
      pause() {
          logger.debug('pause()');
          if (this._closed) {
              logger.error('pause() | Consumer closed');
              return;
          }
          this._paused = true;
          this._track.enabled = false;
          this.emit('@pause');
          // Emit observer event.
          this._observer.safeEmit('pause');
      }
      /**
       * Resumes receiving media.
       */
      resume() {
          logger.debug('resume()');
          if (this._closed) {
              logger.error('resume() | Consumer closed');
              return;
          }
          this._paused = false;
          this._track.enabled = true;
          this.emit('@resume');
          // Emit observer event.
          this._observer.safeEmit('resume');
      }
      _onTrackEnded() {
          logger.debug('track "ended" event');
          this.safeEmit('trackended');
          // Emit observer event.
          this._observer.safeEmit('trackended');
      }
      _handleTrack() {
          this._track.addEventListener('ended', this._onTrackEnded);
      }
      _destroyTrack() {
          try {
              this._track.removeEventListener('ended', this._onTrackEnded);
              this._track.stop();
          }
          catch (error) { }
      }
  }
  exports.Consumer = Consumer;
  
  },{"./EnhancedEventEmitter":43,"./Logger":44,"./errors":49}],40:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.DataConsumer = void 0;
  const Logger_1 = require("./Logger");
  const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
  const logger = new Logger_1.Logger('DataConsumer');
  class DataConsumer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
      constructor({ id, dataProducerId, dataChannel, sctpStreamParameters, appData }) {
          super();
          // Closed flag.
          this._closed = false;
          // Observer instance.
          this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
          logger.debug('constructor()');
          this._id = id;
          this._dataProducerId = dataProducerId;
          this._dataChannel = dataChannel;
          this._sctpStreamParameters = sctpStreamParameters;
          this._appData = appData || {};
          this._handleDataChannel();
      }
      /**
       * DataConsumer id.
       */
      get id() {
          return this._id;
      }
      /**
       * Associated DataProducer id.
       */
      get dataProducerId() {
          return this._dataProducerId;
      }
      /**
       * Whether the DataConsumer is closed.
       */
      get closed() {
          return this._closed;
      }
      /**
       * SCTP stream parameters.
       */
      get sctpStreamParameters() {
          return this._sctpStreamParameters;
      }
      /**
       * DataChannel readyState.
       */
      get readyState() {
          return this._dataChannel.readyState;
      }
      /**
       * DataChannel label.
       */
      get label() {
          return this._dataChannel.label;
      }
      /**
       * DataChannel protocol.
       */
      get protocol() {
          return this._dataChannel.protocol;
      }
      /**
       * DataChannel binaryType.
       */
      get binaryType() {
          return this._dataChannel.binaryType;
      }
      /**
       * Set DataChannel binaryType.
       */
      set binaryType(binaryType) {
          this._dataChannel.binaryType = binaryType;
      }
      /**
       * App custom data.
       */
      get appData() {
          return this._appData;
      }
      /**
       * Invalid setter.
       */
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      set appData(appData) {
          throw new Error('cannot override appData object');
      }
      get observer() {
          return this._observer;
      }
      /**
       * Closes the DataConsumer.
       */
      close() {
          if (this._closed)
              return;
          logger.debug('close()');
          this._closed = true;
          this._dataChannel.close();
          this.emit('@close');
          // Emit observer event.
          this._observer.safeEmit('close');
      }
      /**
       * Transport was closed.
       */
      transportClosed() {
          if (this._closed)
              return;
          logger.debug('transportClosed()');
          this._closed = true;
          this._dataChannel.close();
          this.safeEmit('transportclose');
          // Emit observer event.
          this._observer.safeEmit('close');
      }
      _handleDataChannel() {
          this._dataChannel.addEventListener('open', () => {
              if (this._closed)
                  return;
              logger.debug('DataChannel "open" event');
              this.safeEmit('open');
          });
          this._dataChannel.addEventListener('error', (event) => {
              if (this._closed)
                  return;
              let { error } = event;
              if (!error)
                  error = new Error('unknown DataChannel error');
              if (error.errorDetail === 'sctp-failure') {
                  logger.error('DataChannel SCTP error [sctpCauseCode:%s]: %s', error.sctpCauseCode, error.message);
              }
              else {
                  logger.error('DataChannel "error" event: %o', error);
              }
              this.safeEmit('error', error);
          });
          this._dataChannel.addEventListener('close', () => {
              if (this._closed)
                  return;
              logger.warn('DataChannel "close" event');
              this._closed = true;
              this.emit('@close');
              this.safeEmit('close');
          });
          this._dataChannel.addEventListener('message', (event) => {
              if (this._closed)
                  return;
              this.safeEmit('message', event.data);
          });
      }
  }
  exports.DataConsumer = DataConsumer;
  
  },{"./EnhancedEventEmitter":43,"./Logger":44}],41:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.DataProducer = void 0;
  const Logger_1 = require("./Logger");
  const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
  const errors_1 = require("./errors");
  const logger = new Logger_1.Logger('DataProducer');
  class DataProducer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
      constructor({ id, dataChannel, sctpStreamParameters, appData }) {
          super();
          // Closed flag.
          this._closed = false;
          // Observer instance.
          this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
          logger.debug('constructor()');
          this._id = id;
          this._dataChannel = dataChannel;
          this._sctpStreamParameters = sctpStreamParameters;
          this._appData = appData || {};
          this._handleDataChannel();
      }
      /**
       * DataProducer id.
       */
      get id() {
          return this._id;
      }
      /**
       * Whether the DataProducer is closed.
       */
      get closed() {
          return this._closed;
      }
      /**
       * SCTP stream parameters.
       */
      get sctpStreamParameters() {
          return this._sctpStreamParameters;
      }
      /**
       * DataChannel readyState.
       */
      get readyState() {
          return this._dataChannel.readyState;
      }
      /**
       * DataChannel label.
       */
      get label() {
          return this._dataChannel.label;
      }
      /**
       * DataChannel protocol.
       */
      get protocol() {
          return this._dataChannel.protocol;
      }
      /**
       * DataChannel bufferedAmount.
       */
      get bufferedAmount() {
          return this._dataChannel.bufferedAmount;
      }
      /**
       * DataChannel bufferedAmountLowThreshold.
       */
      get bufferedAmountLowThreshold() {
          return this._dataChannel.bufferedAmountLowThreshold;
      }
      /**
       * Set DataChannel bufferedAmountLowThreshold.
       */
      set bufferedAmountLowThreshold(bufferedAmountLowThreshold) {
          this._dataChannel.bufferedAmountLowThreshold = bufferedAmountLowThreshold;
      }
      /**
       * App custom data.
       */
      get appData() {
          return this._appData;
      }
      /**
       * Invalid setter.
       */
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      set appData(appData) {
          throw new Error('cannot override appData object');
      }
      get observer() {
          return this._observer;
      }
      /**
       * Closes the DataProducer.
       */
      close() {
          if (this._closed)
              return;
          logger.debug('close()');
          this._closed = true;
          this._dataChannel.close();
          this.emit('@close');
          // Emit observer event.
          this._observer.safeEmit('close');
      }
      /**
       * Transport was closed.
       */
      transportClosed() {
          if (this._closed)
              return;
          logger.debug('transportClosed()');
          this._closed = true;
          this._dataChannel.close();
          this.safeEmit('transportclose');
          // Emit observer event.
          this._observer.safeEmit('close');
      }
      /**
       * Send a message.
       *
       * @param {String|Blob|ArrayBuffer|ArrayBufferView} data.
       */
      send(data) {
          logger.debug('send()');
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          this._dataChannel.send(data);
      }
      _handleDataChannel() {
          this._dataChannel.addEventListener('open', () => {
              if (this._closed)
                  return;
              logger.debug('DataChannel "open" event');
              this.safeEmit('open');
          });
          this._dataChannel.addEventListener('error', (event) => {
              if (this._closed)
                  return;
              let { error } = event;
              if (!error)
                  error = new Error('unknown DataChannel error');
              if (error.errorDetail === 'sctp-failure') {
                  logger.error('DataChannel SCTP error [sctpCauseCode:%s]: %s', error.sctpCauseCode, error.message);
              }
              else {
                  logger.error('DataChannel "error" event: %o', error);
              }
              this.safeEmit('error', error);
          });
          this._dataChannel.addEventListener('close', () => {
              if (this._closed)
                  return;
              logger.warn('DataChannel "close" event');
              this._closed = true;
              this.emit('@close');
              this.safeEmit('close');
          });
          this._dataChannel.addEventListener('message', () => {
              if (this._closed)
                  return;
              logger.warn('DataChannel "message" event in a DataProducer, message discarded');
          });
          this._dataChannel.addEventListener('bufferedamountlow', () => {
              if (this._closed)
                  return;
              this.safeEmit('bufferedamountlow');
          });
      }
  }
  exports.DataProducer = DataProducer;
  
  },{"./EnhancedEventEmitter":43,"./Logger":44,"./errors":49}],42:[function(require,module,exports){
  "use strict";
  /* global RTCRtpTransceiver */
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  var __importDefault = (this && this.__importDefault) || function (mod) {
      return (mod && mod.__esModule) ? mod : { "default": mod };
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Device = exports.detectDevice = void 0;
  const bowser_1 = __importDefault(require("bowser"));
  const Logger_1 = require("./Logger");
  const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
  const errors_1 = require("./errors");
  const utils = __importStar(require("./utils"));
  const ortc = __importStar(require("./ortc"));
  const Transport_1 = require("./Transport");
  const Chrome74_1 = require("./handlers/Chrome74");
  const Chrome70_1 = require("./handlers/Chrome70");
  const Chrome67_1 = require("./handlers/Chrome67");
  const Chrome55_1 = require("./handlers/Chrome55");
  const Firefox60_1 = require("./handlers/Firefox60");
  const Safari12_1 = require("./handlers/Safari12");
  const Safari11_1 = require("./handlers/Safari11");
  const Edge11_1 = require("./handlers/Edge11");
  const ReactNative_1 = require("./handlers/ReactNative");
  const logger = new Logger_1.Logger('Device');
  function detectDevice() {
      // React-Native.
      // NOTE: react-native-webrtc >= 1.75.0 is required.
      if (typeof navigator === 'object' && navigator.product === 'ReactNative') {
          if (typeof RTCPeerConnection === 'undefined') {
              logger.warn('this._detectDevice() | unsupported ReactNative without RTCPeerConnection');
              return undefined;
          }
          logger.debug('this._detectDevice() | ReactNative handler chosen');
          return 'ReactNative';
      }
      // Browser.
      else if (typeof navigator === 'object' && typeof navigator.userAgent === 'string') {
          const ua = navigator.userAgent;
          const browser = bowser_1.default.getParser(ua);
          const engine = browser.getEngine();
          // Chrome, Chromium, and Edge.
          if (browser.satisfies({ chrome: '>=74', chromium: '>=74', 'microsoft edge': '>=88' })) {
              return 'Chrome74';
          }
          else if (browser.satisfies({ chrome: '>=70', chromium: '>=70' })) {
              return 'Chrome70';
          }
          else if (browser.satisfies({ chrome: '>=67', chromium: '>=67' })) {
              return 'Chrome67';
          }
          else if (browser.satisfies({ chrome: '>=55', chromium: '>=55' })) {
              return 'Chrome55';
          }
          // Firefox.
          else if (browser.satisfies({ firefox: '>=60' })) {
              return 'Firefox60';
          }
          // Firefox on iOS.
          else if (browser.satisfies({ ios: { OS: '>=14.3', firefox: '>=30.0' } })) {
              return 'Safari12';
          }
          // Safari with Unified-Plan support enabled.
          else if (browser.satisfies({ safari: '>=12.0' }) &&
              typeof RTCRtpTransceiver !== 'undefined' &&
              RTCRtpTransceiver.prototype.hasOwnProperty('currentDirection')) {
              return 'Safari12';
          }
          // Safari with Plab-B support.
          else if (browser.satisfies({ safari: '>=11' })) {
              return 'Safari11';
          }
          // Old Edge with ORTC support.
          else if (browser.satisfies({ 'microsoft edge': '>=11' }) &&
              browser.satisfies({ 'microsoft edge': '<=18' })) {
              return 'Edge11';
          }
          // Best effort for Chromium based browsers.
          else if (engine.name && engine.name.toLowerCase() === 'blink') {
              const match = ua.match(/(?:(?:Chrome|Chromium))[ /](\w+)/i);
              if (match) {
                  const version = Number(match[1]);
                  if (version >= 74) {
                      return 'Chrome74';
                  }
                  else if (version >= 70) {
                      return 'Chrome70';
                  }
                  else if (version >= 67) {
                      return 'Chrome67';
                  }
                  else {
                      return 'Chrome55';
                  }
              }
              else {
                  return 'Chrome74';
              }
          }
          // Unsupported browser.
          else {
              logger.warn('this._detectDevice() | browser not supported [name:%s, version:%s]', browser.getBrowserName(), browser.getBrowserVersion());
              return undefined;
          }
      }
      // Unknown device.
      else {
          logger.warn('this._detectDevice() | unknown device');
          return undefined;
      }
  }
  exports.detectDevice = detectDevice;
  class Device {
      /**
       * Create a new Device to connect to mediasoup server.
       *
       * @throws {UnsupportedError} if device is not supported.
       */
      constructor({ handlerName, handlerFactory, Handler } = {}) {
          // Loaded flag.
          this._loaded = false;
          // Observer instance.
          this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
          logger.debug('constructor()');
          // Handle deprecated option.
          if (Handler) {
              logger.warn('constructor() | Handler option is DEPRECATED, use handlerName or handlerFactory instead');
              if (typeof Handler === 'string')
                  handlerName = Handler;
              else
                  throw new TypeError('non string Handler option no longer supported, use handlerFactory instead');
          }
          if (handlerName && handlerFactory) {
              throw new TypeError('just one of handlerName or handlerInterface can be given');
          }
          if (handlerFactory) {
              this._handlerFactory = handlerFactory;
          }
          else {
              if (handlerName) {
                  logger.debug('constructor() | handler given: %s', handlerName);
              }
              else {
                  handlerName = detectDevice();
                  if (handlerName)
                      logger.debug('constructor() | detected handler: %s', handlerName);
                  else
                      throw new errors_1.UnsupportedError('device not supported');
              }
              switch (handlerName) {
                  case 'Chrome74':
                      this._handlerFactory = Chrome74_1.Chrome74.createFactory();
                      break;
                  case 'Chrome70':
                      this._handlerFactory = Chrome70_1.Chrome70.createFactory();
                      break;
                  case 'Chrome67':
                      this._handlerFactory = Chrome67_1.Chrome67.createFactory();
                      break;
                  case 'Chrome55':
                      this._handlerFactory = Chrome55_1.Chrome55.createFactory();
                      break;
                  case 'Firefox60':
                      this._handlerFactory = Firefox60_1.Firefox60.createFactory();
                      break;
                  case 'Safari12':
                      this._handlerFactory = Safari12_1.Safari12.createFactory();
                      break;
                  case 'Safari11':
                      this._handlerFactory = Safari11_1.Safari11.createFactory();
                      break;
                  case 'Edge11':
                      this._handlerFactory = Edge11_1.Edge11.createFactory();
                      break;
                  case 'ReactNative':
                      this._handlerFactory = ReactNative_1.ReactNative.createFactory();
                      break;
                  default:
                      throw new TypeError(`unknown handlerName "${handlerName}"`);
              }
          }
          // Create a temporal handler to get its name.
          const handler = this._handlerFactory();
          this._handlerName = handler.name;
          handler.close();
          this._extendedRtpCapabilities = undefined;
          this._recvRtpCapabilities = undefined;
          this._canProduceByKind =
              {
                  audio: false,
                  video: false
              };
          this._sctpCapabilities = undefined;
      }
      /**
       * The RTC handler name.
       */
      get handlerName() {
          return this._handlerName;
      }
      /**
       * Whether the Device is loaded.
       */
      get loaded() {
          return this._loaded;
      }
      /**
       * RTP capabilities of the Device for receiving media.
       *
       * @throws {InvalidStateError} if not loaded.
       */
      get rtpCapabilities() {
          if (!this._loaded)
              throw new errors_1.InvalidStateError('not loaded');
          return this._recvRtpCapabilities;
      }
      /**
       * SCTP capabilities of the Device.
       *
       * @throws {InvalidStateError} if not loaded.
       */
      get sctpCapabilities() {
          if (!this._loaded)
              throw new errors_1.InvalidStateError('not loaded');
          return this._sctpCapabilities;
      }
      get observer() {
          return this._observer;
      }
      /**
       * Initialize the Device.
       */
      async load({ routerRtpCapabilities }) {
          logger.debug('load() [routerRtpCapabilities:%o]', routerRtpCapabilities);
          routerRtpCapabilities = utils.clone(routerRtpCapabilities, undefined);
          // Temporal handler to get its capabilities.
          let handler;
          try {
              if (this._loaded)
                  throw new errors_1.InvalidStateError('already loaded');
              // This may throw.
              ortc.validateRtpCapabilities(routerRtpCapabilities);
              handler = this._handlerFactory();
              const nativeRtpCapabilities = await handler.getNativeRtpCapabilities();
              logger.debug('load() | got native RTP capabilities:%o', nativeRtpCapabilities);
              // This may throw.
              ortc.validateRtpCapabilities(nativeRtpCapabilities);
              // Get extended RTP capabilities.
              this._extendedRtpCapabilities = ortc.getExtendedRtpCapabilities(nativeRtpCapabilities, routerRtpCapabilities);
              logger.debug('load() | got extended RTP capabilities:%o', this._extendedRtpCapabilities);
              // Check whether we can produce audio/video.
              this._canProduceByKind.audio =
                  ortc.canSend('audio', this._extendedRtpCapabilities);
              this._canProduceByKind.video =
                  ortc.canSend('video', this._extendedRtpCapabilities);
              // Generate our receiving RTP capabilities for receiving media.
              this._recvRtpCapabilities =
                  ortc.getRecvRtpCapabilities(this._extendedRtpCapabilities);
              // This may throw.
              ortc.validateRtpCapabilities(this._recvRtpCapabilities);
              logger.debug('load() | got receiving RTP capabilities:%o', this._recvRtpCapabilities);
              // Generate our SCTP capabilities.
              this._sctpCapabilities = await handler.getNativeSctpCapabilities();
              logger.debug('load() | got native SCTP capabilities:%o', this._sctpCapabilities);
              // This may throw.
              ortc.validateSctpCapabilities(this._sctpCapabilities);
              logger.debug('load() succeeded');
              this._loaded = true;
              handler.close();
          }
          catch (error) {
              if (handler)
                  handler.close();
              throw error;
          }
      }
      /**
       * Whether we can produce audio/video.
       *
       * @throws {InvalidStateError} if not loaded.
       * @throws {TypeError} if wrong arguments.
       */
      canProduce(kind) {
          if (!this._loaded)
              throw new errors_1.InvalidStateError('not loaded');
          else if (kind !== 'audio' && kind !== 'video')
              throw new TypeError(`invalid kind "${kind}"`);
          return this._canProduceByKind[kind];
      }
      /**
       * Creates a Transport for sending media.
       *
       * @throws {InvalidStateError} if not loaded.
       * @throws {TypeError} if wrong arguments.
       */
      createSendTransport({ id, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, appData }) {
          logger.debug('createSendTransport()');
          return this._createTransport({
              direction: 'send',
              id: id,
              iceParameters: iceParameters,
              iceCandidates: iceCandidates,
              dtlsParameters: dtlsParameters,
              sctpParameters: sctpParameters,
              iceServers: iceServers,
              iceTransportPolicy: iceTransportPolicy,
              additionalSettings: additionalSettings,
              proprietaryConstraints: proprietaryConstraints,
              appData: appData
          });
      }
      /**
       * Creates a Transport for receiving media.
       *
       * @throws {InvalidStateError} if not loaded.
       * @throws {TypeError} if wrong arguments.
       */
      createRecvTransport({ id, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, appData }) {
          logger.debug('createRecvTransport()');
          return this._createTransport({
              direction: 'recv',
              id: id,
              iceParameters: iceParameters,
              iceCandidates: iceCandidates,
              dtlsParameters: dtlsParameters,
              sctpParameters: sctpParameters,
              iceServers: iceServers,
              iceTransportPolicy: iceTransportPolicy,
              additionalSettings: additionalSettings,
              proprietaryConstraints: proprietaryConstraints,
              appData: appData
          });
      }
      _createTransport({ direction, id, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, appData }) {
          if (!this._loaded)
              throw new errors_1.InvalidStateError('not loaded');
          else if (typeof id !== 'string')
              throw new TypeError('missing id');
          else if (typeof iceParameters !== 'object')
              throw new TypeError('missing iceParameters');
          else if (!Array.isArray(iceCandidates))
              throw new TypeError('missing iceCandidates');
          else if (typeof dtlsParameters !== 'object')
              throw new TypeError('missing dtlsParameters');
          else if (sctpParameters && typeof sctpParameters !== 'object')
              throw new TypeError('wrong sctpParameters');
          else if (appData && typeof appData !== 'object')
              throw new TypeError('if given, appData must be an object');
          // Create a new Transport.
          const transport = new Transport_1.Transport({
              direction,
              id,
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters,
              iceServers,
              iceTransportPolicy,
              additionalSettings,
              proprietaryConstraints,
              appData,
              handlerFactory: this._handlerFactory,
              extendedRtpCapabilities: this._extendedRtpCapabilities,
              canProduceByKind: this._canProduceByKind
          });
          // Emit observer event.
          this._observer.safeEmit('newtransport', transport);
          return transport;
      }
  }
  exports.Device = Device;
  
  },{"./EnhancedEventEmitter":43,"./Logger":44,"./Transport":48,"./errors":49,"./handlers/Chrome55":50,"./handlers/Chrome67":51,"./handlers/Chrome70":52,"./handlers/Chrome74":53,"./handlers/Edge11":54,"./handlers/Firefox60":55,"./handlers/ReactNative":57,"./handlers/Safari11":58,"./handlers/Safari12":59,"./ortc":67,"./utils":70,"bowser":8}],43:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.EnhancedEventEmitter = void 0;
  const events_1 = require("events");
  const Logger_1 = require("./Logger");
  const logger = new Logger_1.Logger('EnhancedEventEmitter');
  class EnhancedEventEmitter extends events_1.EventEmitter {
      constructor() {
          super();
          this.setMaxListeners(Infinity);
      }
      emit(eventName, ...args) {
          return super.emit(eventName, ...args);
      }
      /**
       * Special addition to the EventEmitter API.
       */
      safeEmit(eventName, ...args) {
          const numListeners = super.listenerCount(eventName);
          try {
              return super.emit(eventName, ...args);
          }
          catch (error) {
              logger.error('safeEmit() | event listener threw an error [eventName:%s]:%o', eventName, error);
              return Boolean(numListeners);
          }
      }
      on(eventName, listener) {
          super.on(eventName, listener);
          return this;
      }
      off(eventName, listener) {
          super.off(eventName, listener);
          return this;
      }
      addListener(eventName, listener) {
          super.on(eventName, listener);
          return this;
      }
      prependListener(eventName, listener) {
          super.prependListener(eventName, listener);
          return this;
      }
      once(eventName, listener) {
          super.once(eventName, listener);
          return this;
      }
      prependOnceListener(eventName, listener) {
          super.prependOnceListener(eventName, listener);
          return this;
      }
      removeListener(eventName, listener) {
          super.off(eventName, listener);
          return this;
      }
      removeAllListeners(eventName) {
          super.removeAllListeners(eventName);
          return this;
      }
      listenerCount(eventName) {
          return super.listenerCount(eventName);
      }
      listeners(eventName) {
          return super.listeners(eventName);
      }
      rawListeners(eventName) {
          return super.rawListeners(eventName);
      }
  }
  exports.EnhancedEventEmitter = EnhancedEventEmitter;
  
  },{"./Logger":44,"events":29}],44:[function(require,module,exports){
  "use strict";
  var __importDefault = (this && this.__importDefault) || function (mod) {
      return (mod && mod.__esModule) ? mod : { "default": mod };
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Logger = void 0;
  const debug_1 = __importDefault(require("debug"));
  const APP_NAME = 'mediasoup-client';
  class Logger {
      constructor(prefix) {
          if (prefix) {
              this._debug = (0, debug_1.default)(`${APP_NAME}:${prefix}`);
              this._warn = (0, debug_1.default)(`${APP_NAME}:WARN:${prefix}`);
              this._error = (0, debug_1.default)(`${APP_NAME}:ERROR:${prefix}`);
          }
          else {
              this._debug = (0, debug_1.default)(APP_NAME);
              this._warn = (0, debug_1.default)(`${APP_NAME}:WARN`);
              this._error = (0, debug_1.default)(`${APP_NAME}:ERROR`);
          }
          /* eslint-disable no-console */
          this._debug.log = console.info.bind(console);
          this._warn.log = console.warn.bind(console);
          this._error.log = console.error.bind(console);
          /* eslint-enable no-console */
      }
      get debug() {
          return this._debug;
      }
      get warn() {
          return this._warn;
      }
      get error() {
          return this._error;
      }
  }
  exports.Logger = Logger;
  
  },{"debug":71}],45:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Producer = void 0;
  const Logger_1 = require("./Logger");
  const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
  const errors_1 = require("./errors");
  const logger = new Logger_1.Logger('Producer');
  class Producer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
      constructor({ id, localId, rtpSender, track, rtpParameters, stopTracks, disableTrackOnPause, zeroRtpOnPause, appData }) {
          super();
          // Closed flag.
          this._closed = false;
          // Observer instance.
          this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
          logger.debug('constructor()');
          this._id = id;
          this._localId = localId;
          this._rtpSender = rtpSender;
          this._track = track;
          this._kind = track.kind;
          this._rtpParameters = rtpParameters;
          this._paused = disableTrackOnPause ? !track.enabled : false;
          this._maxSpatialLayer = undefined;
          this._stopTracks = stopTracks;
          this._disableTrackOnPause = disableTrackOnPause;
          this._zeroRtpOnPause = zeroRtpOnPause;
          this._appData = appData || {};
          this._onTrackEnded = this._onTrackEnded.bind(this);
          // NOTE: Minor issue. If zeroRtpOnPause is true, we cannot emit the
          // '@replacetrack' event here, so RTCRtpSender.track won't be null.
          this._handleTrack();
      }
      /**
       * Producer id.
       */
      get id() {
          return this._id;
      }
      /**
       * Local id.
       */
      get localId() {
          return this._localId;
      }
      /**
       * Whether the Producer is closed.
       */
      get closed() {
          return this._closed;
      }
      /**
       * Media kind.
       */
      get kind() {
          return this._kind;
      }
      /**
       * Associated RTCRtpSender.
       */
      get rtpSender() {
          return this._rtpSender;
      }
      /**
       * The associated track.
       */
      get track() {
          return this._track;
      }
      /**
       * RTP parameters.
       */
      get rtpParameters() {
          return this._rtpParameters;
      }
      /**
       * Whether the Producer is paused.
       */
      get paused() {
          return this._paused;
      }
      /**
       * Max spatial layer.
       *
       * @type {Number | undefined}
       */
      get maxSpatialLayer() {
          return this._maxSpatialLayer;
      }
      /**
       * App custom data.
       */
      get appData() {
          return this._appData;
      }
      /**
       * Invalid setter.
       */
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      set appData(appData) {
          throw new Error('cannot override appData object');
      }
      get observer() {
          return this._observer;
      }
      /**
       * Closes the Producer.
       */
      close() {
          if (this._closed)
              return;
          logger.debug('close()');
          this._closed = true;
          this._destroyTrack();
          this.emit('@close');
          // Emit observer event.
          this._observer.safeEmit('close');
      }
      /**
       * Transport was closed.
       */
      transportClosed() {
          if (this._closed)
              return;
          logger.debug('transportClosed()');
          this._closed = true;
          this._destroyTrack();
          this.safeEmit('transportclose');
          // Emit observer event.
          this._observer.safeEmit('close');
      }
      /**
       * Get associated RTCRtpSender stats.
       */
      async getStats() {
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          return new Promise((resolve, reject) => {
              this.safeEmit('@getstats', resolve, reject);
          });
      }
      /**
       * Pauses sending media.
       */
      pause() {
          logger.debug('pause()');
          if (this._closed) {
              logger.error('pause() | Producer closed');
              return;
          }
          this._paused = true;
          if (this._track && this._disableTrackOnPause) {
              this._track.enabled = false;
          }
          if (this._zeroRtpOnPause) {
              new Promise((resolve, reject) => {
                  this.safeEmit('@replacetrack', null, resolve, reject);
              }).catch(() => { });
          }
          // Emit observer event.
          this._observer.safeEmit('pause');
      }
      /**
       * Resumes sending media.
       */
      resume() {
          logger.debug('resume()');
          if (this._closed) {
              logger.error('resume() | Producer closed');
              return;
          }
          this._paused = false;
          if (this._track && this._disableTrackOnPause) {
              this._track.enabled = true;
          }
          if (this._zeroRtpOnPause) {
              new Promise((resolve, reject) => {
                  this.safeEmit('@replacetrack', this._track, resolve, reject);
              }).catch(() => { });
          }
          // Emit observer event.
          this._observer.safeEmit('resume');
      }
      /**
       * Replaces the current track with a new one or null.
       */
      async replaceTrack({ track }) {
          logger.debug('replaceTrack() [track:%o]', track);
          if (this._closed) {
              // This must be done here. Otherwise there is no chance to stop the given
              // track.
              if (track && this._stopTracks) {
                  try {
                      track.stop();
                  }
                  catch (error) { }
              }
              throw new errors_1.InvalidStateError('closed');
          }
          else if (track && track.readyState === 'ended') {
              throw new errors_1.InvalidStateError('track ended');
          }
          // Do nothing if this is the same track as the current handled one.
          if (track === this._track) {
              logger.debug('replaceTrack() | same track, ignored');
              return;
          }
          if (!this._zeroRtpOnPause || !this._paused) {
              await new Promise((resolve, reject) => {
                  this.safeEmit('@replacetrack', track, resolve, reject);
              });
          }
          // Destroy the previous track.
          this._destroyTrack();
          // Set the new track.
          this._track = track;
          // If this Producer was paused/resumed and the state of the new
          // track does not match, fix it.
          if (this._track && this._disableTrackOnPause) {
              if (!this._paused)
                  this._track.enabled = true;
              else if (this._paused)
                  this._track.enabled = false;
          }
          // Handle the effective track.
          this._handleTrack();
      }
      /**
       * Sets the video max spatial layer to be sent.
       */
      async setMaxSpatialLayer(spatialLayer) {
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          else if (this._kind !== 'video')
              throw new errors_1.UnsupportedError('not a video Producer');
          else if (typeof spatialLayer !== 'number')
              throw new TypeError('invalid spatialLayer');
          if (spatialLayer === this._maxSpatialLayer)
              return;
          await new Promise((resolve, reject) => {
              this.safeEmit('@setmaxspatiallayer', spatialLayer, resolve, reject);
          }).catch(() => { });
          this._maxSpatialLayer = spatialLayer;
      }
      async setRtpEncodingParameters(params) {
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          else if (typeof params !== 'object')
              throw new TypeError('invalid params');
          await new Promise((resolve, reject) => {
              this.safeEmit('@setrtpencodingparameters', params, resolve, reject);
          });
      }
      _onTrackEnded() {
          logger.debug('track "ended" event');
          this.safeEmit('trackended');
          // Emit observer event.
          this._observer.safeEmit('trackended');
      }
      _handleTrack() {
          if (!this._track)
              return;
          this._track.addEventListener('ended', this._onTrackEnded);
      }
      _destroyTrack() {
          if (!this._track)
              return;
          try {
              this._track.removeEventListener('ended', this._onTrackEnded);
              // Just stop the track unless the app set stopTracks: false.
              if (this._stopTracks)
                  this._track.stop();
          }
          catch (error) { }
      }
  }
  exports.Producer = Producer;
  
  },{"./EnhancedEventEmitter":43,"./Logger":44,"./errors":49}],46:[function(require,module,exports){
  "use strict";
  /**
   * The RTP capabilities define what mediasoup or an endpoint can receive at
   * media level.
   */
  Object.defineProperty(exports, "__esModule", { value: true });
  
  },{}],47:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  
  },{}],48:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Transport = void 0;
  const awaitqueue_1 = require("awaitqueue");
  const Logger_1 = require("./Logger");
  const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
  const errors_1 = require("./errors");
  const utils = __importStar(require("./utils"));
  const ortc = __importStar(require("./ortc"));
  const Producer_1 = require("./Producer");
  const Consumer_1 = require("./Consumer");
  const DataProducer_1 = require("./DataProducer");
  const DataConsumer_1 = require("./DataConsumer");
  const logger = new Logger_1.Logger('Transport');
  class ConsumerCreationTask {
      constructor(consumerOptions) {
          this.consumerOptions = consumerOptions;
          this.promise = new Promise((resolve, reject) => {
              this.resolve = resolve;
              this.reject = reject;
          });
      }
  }
  class Transport extends EnhancedEventEmitter_1.EnhancedEventEmitter {
      constructor({ direction, id, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, appData, handlerFactory, extendedRtpCapabilities, canProduceByKind }) {
          super();
          // Closed flag.
          this._closed = false;
          // Transport connection state.
          this._connectionState = 'new';
          // Map of Producers indexed by id.
          this._producers = new Map();
          // Map of Consumers indexed by id.
          this._consumers = new Map();
          // Map of DataProducers indexed by id.
          this._dataProducers = new Map();
          // Map of DataConsumers indexed by id.
          this._dataConsumers = new Map();
          // Whether the Consumer for RTP probation has been created.
          this._probatorConsumerCreated = false;
          // AwaitQueue instance to make async tasks happen sequentially.
          this._awaitQueue = new awaitqueue_1.AwaitQueue({ ClosedErrorClass: errors_1.InvalidStateError });
          // Consumer creation tasks awaiting to be processed.
          this._pendingConsumerTasks = [];
          // Consumer creation in progress flag.
          this._consumerCreationInProgress = false;
          // Consumers pending to be paused.
          this._pendingPauseConsumers = new Map();
          // Consumer pause in progress flag.
          this._consumerPauseInProgress = false;
          // Consumers pending to be resumed.
          this._pendingResumeConsumers = new Map();
          // Consumer resume in progress flag.
          this._consumerResumeInProgress = false;
          // Observer instance.
          this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
          logger.debug('constructor() [id:%s, direction:%s]', id, direction);
          this._id = id;
          this._direction = direction;
          this._extendedRtpCapabilities = extendedRtpCapabilities;
          this._canProduceByKind = canProduceByKind;
          this._maxSctpMessageSize =
              sctpParameters ? sctpParameters.maxMessageSize : null;
          // Clone and sanitize additionalSettings.
          additionalSettings = utils.clone(additionalSettings, {});
          delete additionalSettings.iceServers;
          delete additionalSettings.iceTransportPolicy;
          delete additionalSettings.bundlePolicy;
          delete additionalSettings.rtcpMuxPolicy;
          delete additionalSettings.sdpSemantics;
          this._handler = handlerFactory();
          this._handler.run({
              direction,
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters,
              iceServers,
              iceTransportPolicy,
              additionalSettings,
              proprietaryConstraints,
              extendedRtpCapabilities
          });
          this._appData = appData || {};
          this._handleHandler();
      }
      /**
       * Transport id.
       */
      get id() {
          return this._id;
      }
      /**
       * Whether the Transport is closed.
       */
      get closed() {
          return this._closed;
      }
      /**
       * Transport direction.
       */
      get direction() {
          return this._direction;
      }
      /**
       * RTC handler instance.
       */
      get handler() {
          return this._handler;
      }
      /**
       * Connection state.
       */
      get connectionState() {
          return this._connectionState;
      }
      /**
       * App custom data.
       */
      get appData() {
          return this._appData;
      }
      /**
       * Invalid setter.
       */
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      set appData(appData) {
          throw new Error('cannot override appData object');
      }
      get observer() {
          return this._observer;
      }
      /**
       * Close the Transport.
       */
      close() {
          if (this._closed)
              return;
          logger.debug('close()');
          this._closed = true;
          // Close the AwaitQueue.
          this._awaitQueue.close();
          // Close the handler.
          this._handler.close();
          // Close all Producers.
          for (const producer of this._producers.values()) {
              producer.transportClosed();
          }
          this._producers.clear();
          // Close all Consumers.
          for (const consumer of this._consumers.values()) {
              consumer.transportClosed();
          }
          this._consumers.clear();
          // Close all DataProducers.
          for (const dataProducer of this._dataProducers.values()) {
              dataProducer.transportClosed();
          }
          this._dataProducers.clear();
          // Close all DataConsumers.
          for (const dataConsumer of this._dataConsumers.values()) {
              dataConsumer.transportClosed();
          }
          this._dataConsumers.clear();
          // Emit observer event.
          this._observer.safeEmit('close');
      }
      /**
       * Get associated Transport (RTCPeerConnection) stats.
       *
       * @returns {RTCStatsReport}
       */
      async getStats() {
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          return this._handler.getTransportStats();
      }
      /**
       * Restart ICE connection.
       */
      async restartIce({ iceParameters }) {
          logger.debug('restartIce()');
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          else if (!iceParameters)
              throw new TypeError('missing iceParameters');
          // Enqueue command.
          return this._awaitQueue.push(async () => this._handler.restartIce(iceParameters), 'transport.restartIce()');
      }
      /**
       * Update ICE servers.
       */
      async updateIceServers({ iceServers } = {}) {
          logger.debug('updateIceServers()');
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          else if (!Array.isArray(iceServers))
              throw new TypeError('missing iceServers');
          // Enqueue command.
          return this._awaitQueue.push(async () => this._handler.updateIceServers(iceServers), 'transport.updateIceServers()');
      }
      /**
       * Create a Producer.
       */
      async produce({ track, encodings, codecOptions, codec, stopTracks = true, disableTrackOnPause = true, zeroRtpOnPause = false, appData = {} } = {}) {
          logger.debug('produce() [track:%o]', track);
          if (!track)
              throw new TypeError('missing track');
          else if (this._direction !== 'send')
              throw new errors_1.UnsupportedError('not a sending Transport');
          else if (!this._canProduceByKind[track.kind])
              throw new errors_1.UnsupportedError(`cannot produce ${track.kind}`);
          else if (track.readyState === 'ended')
              throw new errors_1.InvalidStateError('track ended');
          else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
              throw new TypeError('no "connect" listener set into this transport');
          else if (this.listenerCount('produce') === 0)
              throw new TypeError('no "produce" listener set into this transport');
          else if (appData && typeof appData !== 'object')
              throw new TypeError('if given, appData must be an object');
          // Enqueue command.
          return this._awaitQueue.push(async () => {
              let normalizedEncodings;
              if (encodings && !Array.isArray(encodings)) {
                  throw TypeError('encodings must be an array');
              }
              else if (encodings && encodings.length === 0) {
                  normalizedEncodings = undefined;
              }
              else if (encodings) {
                  normalizedEncodings = encodings
                      .map((encoding) => {
                      const normalizedEncoding = { active: true };
                      if (encoding.active === false)
                          normalizedEncoding.active = false;
                      if (typeof encoding.dtx === 'boolean')
                          normalizedEncoding.dtx = encoding.dtx;
                      if (typeof encoding.scalabilityMode === 'string')
                          normalizedEncoding.scalabilityMode = encoding.scalabilityMode;
                      if (typeof encoding.scaleResolutionDownBy === 'number')
                          normalizedEncoding.scaleResolutionDownBy = encoding.scaleResolutionDownBy;
                      if (typeof encoding.maxBitrate === 'number')
                          normalizedEncoding.maxBitrate = encoding.maxBitrate;
                      if (typeof encoding.maxFramerate === 'number')
                          normalizedEncoding.maxFramerate = encoding.maxFramerate;
                      if (typeof encoding.adaptivePtime === 'boolean')
                          normalizedEncoding.adaptivePtime = encoding.adaptivePtime;
                      if (typeof encoding.priority === 'string')
                          normalizedEncoding.priority = encoding.priority;
                      if (typeof encoding.networkPriority === 'string')
                          normalizedEncoding.networkPriority = encoding.networkPriority;
                      return normalizedEncoding;
                  });
              }
              const { localId, rtpParameters, rtpSender } = await this._handler.send({
                  track,
                  encodings: normalizedEncodings,
                  codecOptions,
                  codec
              });
              try {
                  // This will fill rtpParameters's missing fields with default values.
                  ortc.validateRtpParameters(rtpParameters);
                  const { id } = await new Promise((resolve, reject) => {
                      this.safeEmit('produce', {
                          kind: track.kind,
                          rtpParameters,
                          appData
                      }, resolve, reject);
                  });
                  const producer = new Producer_1.Producer({
                      id,
                      localId,
                      rtpSender,
                      track,
                      rtpParameters,
                      stopTracks,
                      disableTrackOnPause,
                      zeroRtpOnPause,
                      appData
                  });
                  this._producers.set(producer.id, producer);
                  this._handleProducer(producer);
                  // Emit observer event.
                  this._observer.safeEmit('newproducer', producer);
                  return producer;
              }
              catch (error) {
                  this._handler.stopSending(localId)
                      .catch(() => { });
                  throw error;
              }
          }, 'transport.produce()')
              // This catch is needed to stop the given track if the command above
              // failed due to closed Transport.
              .catch((error) => {
              if (stopTracks) {
                  try {
                      track.stop();
                  }
                  catch (error2) { }
              }
              throw error;
          });
      }
      /**
       * Create a Consumer to consume a remote Producer.
       */
      async consume({ id, producerId, kind, rtpParameters, appData = {} }) {
          logger.debug('consume()');
          rtpParameters = utils.clone(rtpParameters, undefined);
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          else if (this._direction !== 'recv')
              throw new errors_1.UnsupportedError('not a receiving Transport');
          else if (typeof id !== 'string')
              throw new TypeError('missing id');
          else if (typeof producerId !== 'string')
              throw new TypeError('missing producerId');
          else if (kind !== 'audio' && kind !== 'video')
              throw new TypeError(`invalid kind '${kind}'`);
          else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
              throw new TypeError('no "connect" listener set into this transport');
          else if (appData && typeof appData !== 'object')
              throw new TypeError('if given, appData must be an object');
          // Ensure the device can consume it.
          const canConsume = ortc.canReceive(rtpParameters, this._extendedRtpCapabilities);
          if (!canConsume)
              throw new errors_1.UnsupportedError('cannot consume this Producer');
          const consumerCreationTask = new ConsumerCreationTask({
              id,
              producerId,
              kind,
              rtpParameters,
              appData
          });
          // Store the Consumer creation task.
          this._pendingConsumerTasks.push(consumerCreationTask);
          // There is no Consumer creation in progress, create it now.
          if (this._consumerCreationInProgress === false) {
              this._createPendingConsumers();
          }
          return consumerCreationTask.promise;
      }
      /**
       * Create a DataProducer
       */
      async produceData({ ordered = true, maxPacketLifeTime, maxRetransmits, label = '', protocol = '', appData = {} } = {}) {
          logger.debug('produceData()');
          if (this._direction !== 'send')
              throw new errors_1.UnsupportedError('not a sending Transport');
          else if (!this._maxSctpMessageSize)
              throw new errors_1.UnsupportedError('SCTP not enabled by remote Transport');
          else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
              throw new TypeError('no "connect" listener set into this transport');
          else if (this.listenerCount('producedata') === 0)
              throw new TypeError('no "producedata" listener set into this transport');
          else if (appData && typeof appData !== 'object')
              throw new TypeError('if given, appData must be an object');
          if (maxPacketLifeTime || maxRetransmits)
              ordered = false;
          // Enqueue command.
          return this._awaitQueue.push(async () => {
              const { dataChannel, sctpStreamParameters } = await this._handler.sendDataChannel({
                  ordered,
                  maxPacketLifeTime,
                  maxRetransmits,
                  label,
                  protocol
              });
              // This will fill sctpStreamParameters's missing fields with default values.
              ortc.validateSctpStreamParameters(sctpStreamParameters);
              const { id } = await new Promise((resolve, reject) => {
                  this.safeEmit('producedata', {
                      sctpStreamParameters,
                      label,
                      protocol,
                      appData
                  }, resolve, reject);
              });
              const dataProducer = new DataProducer_1.DataProducer({ id, dataChannel, sctpStreamParameters, appData });
              this._dataProducers.set(dataProducer.id, dataProducer);
              this._handleDataProducer(dataProducer);
              // Emit observer event.
              this._observer.safeEmit('newdataproducer', dataProducer);
              return dataProducer;
          }, 'transport.produceData()');
      }
      /**
       * Create a DataConsumer
       */
      async consumeData({ id, dataProducerId, sctpStreamParameters, label = '', protocol = '', appData = {} }) {
          logger.debug('consumeData()');
          sctpStreamParameters = utils.clone(sctpStreamParameters, undefined);
          if (this._closed)
              throw new errors_1.InvalidStateError('closed');
          else if (this._direction !== 'recv')
              throw new errors_1.UnsupportedError('not a receiving Transport');
          else if (!this._maxSctpMessageSize)
              throw new errors_1.UnsupportedError('SCTP not enabled by remote Transport');
          else if (typeof id !== 'string')
              throw new TypeError('missing id');
          else if (typeof dataProducerId !== 'string')
              throw new TypeError('missing dataProducerId');
          else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
              throw new TypeError('no "connect" listener set into this transport');
          else if (appData && typeof appData !== 'object')
              throw new TypeError('if given, appData must be an object');
          // This may throw.
          ortc.validateSctpStreamParameters(sctpStreamParameters);
          // Enqueue command.
          return this._awaitQueue.push(async () => {
              const { dataChannel } = await this._handler.receiveDataChannel({
                  sctpStreamParameters,
                  label,
                  protocol
              });
              const dataConsumer = new DataConsumer_1.DataConsumer({
                  id,
                  dataProducerId,
                  dataChannel,
                  sctpStreamParameters,
                  appData
              });
              this._dataConsumers.set(dataConsumer.id, dataConsumer);
              this._handleDataConsumer(dataConsumer);
              // Emit observer event.
              this._observer.safeEmit('newdataconsumer', dataConsumer);
              return dataConsumer;
          }, 'transport.consumeData()');
      }
      // This method is guaranteed to never throw.
      async _createPendingConsumers() {
          this._consumerCreationInProgress = true;
          this._awaitQueue.push(async () => {
              const pendingConsumerTasks = [...this._pendingConsumerTasks];
              // Clear pending Consumer tasks.
              this._pendingConsumerTasks = [];
              // Video Consumer in order to create the probator.
              let videoConsumerForProbator = undefined;
              // Fill options list.
              const optionsList = [];
              for (const task of pendingConsumerTasks) {
                  const { id, kind, rtpParameters } = task.consumerOptions;
                  optionsList.push({
                      trackId: id,
                      kind: kind,
                      rtpParameters
                  });
              }
              try {
                  const results = await this._handler.receive(optionsList);
                  for (let idx = 0; idx < results.length; idx++) {
                      const task = pendingConsumerTasks[idx];
                      const result = results[idx];
                      const { id, producerId, kind, rtpParameters, appData } = task.consumerOptions;
                      const { localId, rtpReceiver, track } = result;
                      const consumer = new Consumer_1.Consumer({
                          id: id,
                          localId,
                          producerId: producerId,
                          rtpReceiver,
                          track,
                          rtpParameters,
                          appData
                      });
                      this._consumers.set(consumer.id, consumer);
                      this._handleConsumer(consumer);
                      // If this is the first video Consumer and the Consumer for RTP probation
                      // has not yet been created, it's time to create it.
                      if (!this._probatorConsumerCreated && !videoConsumerForProbator && kind === 'video') {
                          videoConsumerForProbator = consumer;
                      }
                      // Emit observer event.
                      this._observer.safeEmit('newconsumer', consumer);
                      task.resolve(consumer);
                  }
              }
              catch (error) {
                  for (const task of pendingConsumerTasks) {
                      task.reject(error);
                  }
              }
              // If RTP probation must be handled, do it now.
              if (videoConsumerForProbator) {
                  try {
                      const probatorRtpParameters = ortc.generateProbatorRtpParameters(videoConsumerForProbator.rtpParameters);
                      await this._handler.receive([{
                              trackId: 'probator',
                              kind: 'video',
                              rtpParameters: probatorRtpParameters
                          }]);
                      logger.debug('_createPendingConsumers() | Consumer for RTP probation created');
                      this._probatorConsumerCreated = true;
                  }
                  catch (error) {
                      logger.error('_createPendingConsumers() | failed to create Consumer for RTP probation:%o', error);
                  }
              }
              this._consumerCreationInProgress = false;
          }, 'transport._createPendingConsumers()')
              .then(() => {
              // There are pending Consumer tasks, enqueue their creation.
              if (this._pendingConsumerTasks.length > 0) {
                  this._createPendingConsumers();
              }
          })
              // NOTE: We only get here when the await queue is closed.
              .catch(() => { });
      }
      _pausePendingConsumers() {
          this._consumerPauseInProgress = true;
          this._awaitQueue.push(async () => {
              const pendingPauseConsumers = Array.from(this._pendingPauseConsumers.values());
              // Clear pending pause Consumer map.
              this._pendingPauseConsumers.clear();
              try {
                  await this._handler.pauseReceiving(pendingPauseConsumers.map((consumer) => consumer.localId));
              }
              catch (error) {
                  logger.error('_pausePendingConsumers() | failed to pause Consumers:', error);
              }
              this._consumerPauseInProgress = false;
          }, 'consumer @pause event')
              .then(() => {
              // There are pending Consumers to be paused, do it.
              if (this._pendingPauseConsumers.size > 0) {
                  this._pausePendingConsumers();
              }
          })
              // NOTE: We only get here when the await queue is closed.
              .catch(() => { });
      }
      _resumePendingConsumers() {
          this._consumerResumeInProgress = true;
          this._awaitQueue.push(async () => {
              const pendingResumeConsumers = Array.from(this._pendingResumeConsumers.values());
              // Clear pending resume Consumer map.
              this._pendingResumeConsumers.clear();
              try {
                  await this._handler.resumeReceiving(pendingResumeConsumers.map((consumer) => consumer.localId));
              }
              catch (error) {
                  logger.error('_resumePendingConsumers() | failed to resume Consumers:', error);
              }
          }, 'consumer @resume event')
              .then(() => {
              this._consumerResumeInProgress = false;
              // There are pending Consumer to be resumed, do it.
              if (this._pendingResumeConsumers.size > 0) {
                  this._resumePendingConsumers();
              }
          })
              // NOTE: We only get here when the await queue is closed.
              .catch(() => { });
      }
      _handleHandler() {
          const handler = this._handler;
          handler.on('@connect', ({ dtlsParameters }, callback, errback) => {
              if (this._closed) {
                  errback(new errors_1.InvalidStateError('closed'));
                  return;
              }
              this.safeEmit('connect', { dtlsParameters }, callback, errback);
          });
          handler.on('@connectionstatechange', (connectionState) => {
              if (connectionState === this._connectionState)
                  return;
              logger.debug('connection state changed to %s', connectionState);
              this._connectionState = connectionState;
              if (!this._closed)
                  this.safeEmit('connectionstatechange', connectionState);
          });
      }
      _handleProducer(producer) {
          producer.on('@close', () => {
              this._producers.delete(producer.id);
              if (this._closed)
                  return;
              this._awaitQueue.push(async () => this._handler.stopSending(producer.localId), 'producer @close event')
                  .catch((error) => logger.warn('producer.close() failed:%o', error));
          });
          producer.on('@replacetrack', (track, callback, errback) => {
              this._awaitQueue.push(async () => this._handler.replaceTrack(producer.localId, track), 'producer @replacetrack event')
                  .then(callback)
                  .catch(errback);
          });
          producer.on('@setmaxspatiallayer', (spatialLayer, callback, errback) => {
              this._awaitQueue.push(async () => (this._handler.setMaxSpatialLayer(producer.localId, spatialLayer)), 'producer @setmaxspatiallayer event')
                  .then(callback)
                  .catch(errback);
          });
          producer.on('@setrtpencodingparameters', (params, callback, errback) => {
              this._awaitQueue.push(async () => (this._handler.setRtpEncodingParameters(producer.localId, params)), 'producer @setrtpencodingparameters event')
                  .then(callback)
                  .catch(errback);
          });
          producer.on('@getstats', (callback, errback) => {
              if (this._closed)
                  return errback(new errors_1.InvalidStateError('closed'));
              this._handler.getSenderStats(producer.localId)
                  .then(callback)
                  .catch(errback);
          });
      }
      _handleConsumer(consumer) {
          consumer.on('@close', () => {
              this._consumers.delete(consumer.id);
              this._pendingPauseConsumers.delete(consumer.id);
              this._pendingResumeConsumers.delete(consumer.id);
              if (this._closed)
                  return;
              this._awaitQueue.push(async () => this._handler.stopReceiving(consumer.localId), 'consumer @close event')
                  .catch(() => { });
          });
          consumer.on('@pause', () => {
              // If Consumer is pending to be resumed, remove from pending resume list.
              if (this._pendingResumeConsumers.has(consumer.id)) {
                  this._pendingResumeConsumers.delete(consumer.id);
              }
              // Store the Consumer into the pending list.
              this._pendingPauseConsumers.set(consumer.id, consumer);
              // There is no Consumer pause in progress, do it now.
              if (this._consumerPauseInProgress === false) {
                  this._pausePendingConsumers();
              }
          });
          consumer.on('@resume', () => {
              // If Consumer is pending to be paused, remove from pending pause list.
              if (this._pendingPauseConsumers.has(consumer.id)) {
                  this._pendingPauseConsumers.delete(consumer.id);
              }
              // Store the Consumer into the pending list.
              this._pendingResumeConsumers.set(consumer.id, consumer);
              // There is no Consumer resume in progress, do it now.
              if (this._consumerResumeInProgress === false) {
                  this._resumePendingConsumers();
              }
          });
          consumer.on('@getstats', (callback, errback) => {
              if (this._closed)
                  return errback(new errors_1.InvalidStateError('closed'));
              this._handler.getReceiverStats(consumer.localId)
                  .then(callback)
                  .catch(errback);
          });
      }
      _handleDataProducer(dataProducer) {
          dataProducer.on('@close', () => {
              this._dataProducers.delete(dataProducer.id);
          });
      }
      _handleDataConsumer(dataConsumer) {
          dataConsumer.on('@close', () => {
              this._dataConsumers.delete(dataConsumer.id);
          });
      }
  }
  exports.Transport = Transport;
  
  },{"./Consumer":39,"./DataConsumer":40,"./DataProducer":41,"./EnhancedEventEmitter":43,"./Logger":44,"./Producer":45,"./errors":49,"./ortc":67,"./utils":70,"awaitqueue":3}],49:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.InvalidStateError = exports.UnsupportedError = void 0;
  /**
   * Error indicating not support for something.
   */
  class UnsupportedError extends Error {
      constructor(message) {
          super(message);
          this.name = 'UnsupportedError';
          if (Error.hasOwnProperty('captureStackTrace')) // Just in V8.
           {
              // @ts-ignore
              Error.captureStackTrace(this, UnsupportedError);
          }
          else {
              this.stack = (new Error(message)).stack;
          }
      }
  }
  exports.UnsupportedError = UnsupportedError;
  /**
   * Error produced when calling a method in an invalid state.
   */
  class InvalidStateError extends Error {
      constructor(message) {
          super(message);
          this.name = 'InvalidStateError';
          if (Error.hasOwnProperty('captureStackTrace')) // Just in V8.
           {
              // @ts-ignore
              Error.captureStackTrace(this, InvalidStateError);
          }
          else {
              this.stack = (new Error(message)).stack;
          }
      }
  }
  exports.InvalidStateError = InvalidStateError;
  
  },{}],50:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Chrome55 = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  const Logger_1 = require("../Logger");
  const errors_1 = require("../errors");
  const utils = __importStar(require("../utils"));
  const ortc = __importStar(require("../ortc"));
  const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
  const sdpPlanBUtils = __importStar(require("./sdp/planBUtils"));
  const HandlerInterface_1 = require("./HandlerInterface");
  const RemoteSdp_1 = require("./sdp/RemoteSdp");
  const logger = new Logger_1.Logger('Chrome55');
  const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
  class Chrome55 extends HandlerInterface_1.HandlerInterface {
      constructor() {
          super();
          // Local stream for sending.
          this._sendStream = new MediaStream();
          // Map of sending MediaStreamTracks indexed by localId.
          this._mapSendLocalIdTrack = new Map();
          // Next sending localId.
          this._nextSendLocalId = 0;
          // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
          // Value is an Object with mid, rtpParameters and rtpReceiver.
          this._mapRecvLocalIdInfo = new Map();
          // Whether a DataChannel m=application section has been created.
          this._hasDataChannelMediaSection = false;
          // Sending DataChannel id value counter. Incremented for each new DataChannel.
          this._nextSendSctpStreamId = 0;
          // Got transport local and remote parameters.
          this._transportReady = false;
      }
      /**
       * Creates a factory function.
       */
      static createFactory() {
          return () => new Chrome55();
      }
      get name() {
          return 'Chrome55';
      }
      close() {
          logger.debug('close()');
          // Close RTCPeerConnection.
          if (this._pc) {
              try {
                  this._pc.close();
              }
              catch (error) { }
          }
      }
      async getNativeRtpCapabilities() {
          logger.debug('getNativeRtpCapabilities()');
          const pc = new RTCPeerConnection({
              iceServers: [],
              iceTransportPolicy: 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'plan-b'
          });
          try {
              const offer = await pc.createOffer({
                  offerToReceiveAudio: true,
                  offerToReceiveVideo: true
              });
              try {
                  pc.close();
              }
              catch (error) { }
              const sdpObject = sdpTransform.parse(offer.sdp);
              const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
              return nativeRtpCapabilities;
          }
          catch (error) {
              try {
                  pc.close();
              }
              catch (error2) { }
              throw error;
          }
      }
      async getNativeSctpCapabilities() {
          logger.debug('getNativeSctpCapabilities()');
          return {
              numStreams: SCTP_NUM_STREAMS
          };
      }
      run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
          logger.debug('run()');
          this._direction = direction;
          this._remoteSdp = new RemoteSdp_1.RemoteSdp({
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters,
              planB: true
          });
          this._sendingRtpParametersByKind =
              {
                  audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
              };
          this._sendingRemoteRtpParametersByKind =
              {
                  audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
              };
          if (dtlsParameters.role && dtlsParameters.role !== 'auto') {
              this._forcedLocalDtlsRole = dtlsParameters.role === 'server'
                  ? 'client'
                  : 'server';
          }
          this._pc = new RTCPeerConnection({
              iceServers: iceServers || [],
              iceTransportPolicy: iceTransportPolicy || 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'plan-b',
              ...additionalSettings
          }, proprietaryConstraints);
          // Handle RTCPeerConnection connection status.
          this._pc.addEventListener('iceconnectionstatechange', () => {
              switch (this._pc.iceConnectionState) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
      }
      async updateIceServers(iceServers) {
          logger.debug('updateIceServers()');
          const configuration = this._pc.getConfiguration();
          configuration.iceServers = iceServers;
          this._pc.setConfiguration(configuration);
      }
      async restartIce(iceParameters) {
          logger.debug('restartIce()');
          // Provide the remote SDP handler with new remote ICE parameters.
          this._remoteSdp.updateIceParameters(iceParameters);
          if (!this._transportReady)
              return;
          if (this._direction === 'send') {
              const offer = await this._pc.createOffer({ iceRestart: true });
              logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
          }
          else {
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
          }
      }
      async getTransportStats() {
          return this._pc.getStats();
      }
      async send({ track, encodings, codecOptions, codec }) {
          var _a;
          this._assertSendDirection();
          logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
          if (codec) {
              logger.warn('send() | codec selection is not available in %s handler', this.name);
          }
          this._sendStream.addTrack(track);
          this._pc.addStream(this._sendStream);
          let offer = await this._pc.createOffer();
          let localSdpObject = sdpTransform.parse(offer.sdp);
          let offerMediaObject;
          const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
          sendingRtpParameters.codecs =
              ortc.reduceCodecs(sendingRtpParameters.codecs);
          const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
          sendingRemoteRtpParameters.codecs =
              ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          if (track.kind === 'video' && encodings && encodings.length > 1) {
              logger.debug('send() | enabling simulcast');
              localSdpObject = sdpTransform.parse(offer.sdp);
              offerMediaObject = localSdpObject.media.find((m) => m.type === 'video');
              sdpPlanBUtils.addLegacySimulcast({
                  offerMediaObject,
                  track,
                  numStreams: encodings.length
              });
              offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
          }
          logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          offerMediaObject = localSdpObject.media
              .find((m) => m.type === track.kind);
          // Set RTCP CNAME.
          sendingRtpParameters.rtcp.cname =
              sdpCommonUtils.getCname({ offerMediaObject });
          // Set RTP encodings.
          sendingRtpParameters.encodings =
              sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
          // Complete encodings with given values.
          if (encodings) {
              for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
                  if (encodings[idx])
                      Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
              }
          }
          // If VP8 and there is effective simulcast, add scalabilityMode to each
          // encoding.
          if (sendingRtpParameters.encodings.length > 1 &&
              sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8') {
              for (const encoding of sendingRtpParameters.encodings) {
                  encoding.scalabilityMode = 'S1T3';
              }
          }
          this._remoteSdp.send({
              offerMediaObject,
              offerRtpParameters: sendingRtpParameters,
              answerRtpParameters: sendingRemoteRtpParameters,
              codecOptions
          });
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          const localId = String(this._nextSendLocalId);
          this._nextSendLocalId++;
          // Insert into the map.
          this._mapSendLocalIdTrack.set(localId, track);
          return {
              localId: localId,
              rtpParameters: sendingRtpParameters
          };
      }
      async stopSending(localId) {
          this._assertSendDirection();
          logger.debug('stopSending() [localId:%s]', localId);
          const track = this._mapSendLocalIdTrack.get(localId);
          if (!track)
              throw new Error('track not found');
          this._mapSendLocalIdTrack.delete(localId);
          this._sendStream.removeTrack(track);
          this._pc.addStream(this._sendStream);
          const offer = await this._pc.createOffer();
          logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
          try {
              await this._pc.setLocalDescription(offer);
          }
          catch (error) {
              // NOTE: If there are no sending tracks, setLocalDescription() will fail with
              // "Failed to create channels". If so, ignore it.
              if (this._sendStream.getTracks().length === 0) {
                  logger.warn('stopSending() | ignoring expected error due no sending tracks: %s', error.toString());
                  return;
              }
              throw error;
          }
          if (this._pc.signalingState === 'stable')
              return;
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
      }
      async replaceTrack(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localId, track) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async setMaxSpatialLayer(localId, spatialLayer) {
          throw new errors_1.UnsupportedError(' not implemented');
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async setRtpEncodingParameters(localId, params) {
          throw new errors_1.UnsupportedError('not supported');
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async getSenderStats(localId) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
          var _a;
          this._assertSendDirection();
          const options = {
              negotiated: true,
              id: this._nextSendSctpStreamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmitTime: maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('sendDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // Increase next id.
          this._nextSendSctpStreamId =
              ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
          // If this is the first DataChannel we need to create the SDP answer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              const offer = await this._pc.createOffer();
              const localSdpObject = sdpTransform.parse(offer.sdp);
              const offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'application');
              if (!this._transportReady) {
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              this._remoteSdp.sendSctpAssociation({ offerMediaObject });
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          const sctpStreamParameters = {
              streamId: options.id,
              ordered: options.ordered,
              maxPacketLifeTime: options.maxPacketLifeTime,
              maxRetransmits: options.maxRetransmits
          };
          return { dataChannel, sctpStreamParameters };
      }
      async receive(optionsList) {
          var _a;
          this._assertRecvDirection();
          const results = [];
          for (const options of optionsList) {
              const { trackId, kind, rtpParameters } = options;
              logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
              const mid = kind;
              const streamId = rtpParameters.rtcp.cname;
              this._remoteSdp.receive({
                  mid,
                  kind,
                  offerRtpParameters: rtpParameters,
                  streamId,
                  trackId
              });
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          let answer = await this._pc.createAnswer();
          const localSdpObject = sdpTransform.parse(answer.sdp);
          for (const options of optionsList) {
              const { kind, rtpParameters } = options;
              const mid = kind;
              const answerMediaObject = localSdpObject.media
                  .find((m) => String(m.mid) === mid);
              // May need to modify codec parameters in the answer based on codec
              // parameters in the offer.
              sdpCommonUtils.applyCodecParameters({
                  offerRtpParameters: rtpParameters,
                  answerMediaObject
              });
          }
          answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          for (const options of optionsList) {
              const { kind, trackId, rtpParameters } = options;
              const mid = kind;
              const localId = trackId;
              const streamId = rtpParameters.rtcp.cname;
              const stream = this._pc.getRemoteStreams()
                  .find((s) => s.id === streamId);
              const track = stream.getTrackById(localId);
              if (!track)
                  throw new Error('remote track not found');
              // Insert into the map.
              this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters });
              results.push({ localId, track });
          }
          return results;
      }
      async stopReceiving(localId) {
          this._assertRecvDirection();
          logger.debug('stopReceiving() [localId:%s]', localId);
          const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
          // Remove from the map.
          this._mapRecvLocalIdInfo.delete(localId);
          this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async pauseReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async resumeReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async getReceiverStats(localId) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
          var _a;
          this._assertRecvDirection();
          const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
          const options = {
              negotiated: true,
              id: streamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmitTime: maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('receiveDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // If this is the first DataChannel we need to create the SDP offer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              if (!this._transportReady) {
                  const localSdpObject = sdpTransform.parse(answer.sdp);
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          return { dataChannel };
      }
      async _setupTransport({ localDtlsRole, localSdpObject }) {
          if (!localSdpObject)
              localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          // Get our local DTLS parameters.
          const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
          // Set our DTLS role.
          dtlsParameters.role = localDtlsRole;
          // Update the remote DTLS role in the SDP.
          this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
          // Need to tell the remote transport about our parameters.
          await new Promise((resolve, reject) => {
              this.safeEmit('@connect', { dtlsParameters }, resolve, reject);
          });
          this._transportReady = true;
      }
      _assertSendDirection() {
          if (this._direction !== 'send') {
              throw new Error('method can just be called for handlers with "send" direction');
          }
      }
      _assertRecvDirection() {
          if (this._direction !== 'recv') {
              throw new Error('method can just be called for handlers with "recv" direction');
          }
      }
  }
  exports.Chrome55 = Chrome55;
  
  },{"../Logger":44,"../errors":49,"../ortc":67,"../utils":70,"./HandlerInterface":56,"./sdp/RemoteSdp":62,"./sdp/commonUtils":63,"./sdp/planBUtils":64,"sdp-transform":79}],51:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Chrome67 = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  const Logger_1 = require("../Logger");
  const utils = __importStar(require("../utils"));
  const ortc = __importStar(require("../ortc"));
  const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
  const sdpPlanBUtils = __importStar(require("./sdp/planBUtils"));
  const HandlerInterface_1 = require("./HandlerInterface");
  const RemoteSdp_1 = require("./sdp/RemoteSdp");
  const logger = new Logger_1.Logger('Chrome67');
  const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
  class Chrome67 extends HandlerInterface_1.HandlerInterface {
      constructor() {
          super();
          // Local stream for sending.
          this._sendStream = new MediaStream();
          // Map of RTCRtpSender indexed by localId.
          this._mapSendLocalIdRtpSender = new Map();
          // Next sending localId.
          this._nextSendLocalId = 0;
          // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
          // Value is an Object with mid, rtpParameters and rtpReceiver.
          this._mapRecvLocalIdInfo = new Map();
          // Whether a DataChannel m=application section has been created.
          this._hasDataChannelMediaSection = false;
          // Sending DataChannel id value counter. Incremented for each new DataChannel.
          this._nextSendSctpStreamId = 0;
          // Got transport local and remote parameters.
          this._transportReady = false;
      }
      /**
       * Creates a factory function.
       */
      static createFactory() {
          return () => new Chrome67();
      }
      get name() {
          return 'Chrome67';
      }
      close() {
          logger.debug('close()');
          // Close RTCPeerConnection.
          if (this._pc) {
              try {
                  this._pc.close();
              }
              catch (error) { }
          }
      }
      async getNativeRtpCapabilities() {
          logger.debug('getNativeRtpCapabilities()');
          const pc = new RTCPeerConnection({
              iceServers: [],
              iceTransportPolicy: 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'plan-b'
          });
          try {
              const offer = await pc.createOffer({
                  offerToReceiveAudio: true,
                  offerToReceiveVideo: true
              });
              try {
                  pc.close();
              }
              catch (error) { }
              const sdpObject = sdpTransform.parse(offer.sdp);
              const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
              return nativeRtpCapabilities;
          }
          catch (error) {
              try {
                  pc.close();
              }
              catch (error2) { }
              throw error;
          }
      }
      async getNativeSctpCapabilities() {
          logger.debug('getNativeSctpCapabilities()');
          return {
              numStreams: SCTP_NUM_STREAMS
          };
      }
      run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
          logger.debug('run()');
          this._direction = direction;
          this._remoteSdp = new RemoteSdp_1.RemoteSdp({
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters,
              planB: true
          });
          this._sendingRtpParametersByKind =
              {
                  audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
              };
          this._sendingRemoteRtpParametersByKind =
              {
                  audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
              };
          if (dtlsParameters.role && dtlsParameters.role !== 'auto') {
              this._forcedLocalDtlsRole = dtlsParameters.role === 'server'
                  ? 'client'
                  : 'server';
          }
          this._pc = new RTCPeerConnection({
              iceServers: iceServers || [],
              iceTransportPolicy: iceTransportPolicy || 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'plan-b',
              ...additionalSettings
          }, proprietaryConstraints);
          // Handle RTCPeerConnection connection status.
          this._pc.addEventListener('iceconnectionstatechange', () => {
              switch (this._pc.iceConnectionState) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
      }
      async updateIceServers(iceServers) {
          logger.debug('updateIceServers()');
          const configuration = this._pc.getConfiguration();
          configuration.iceServers = iceServers;
          this._pc.setConfiguration(configuration);
      }
      async restartIce(iceParameters) {
          logger.debug('restartIce()');
          // Provide the remote SDP handler with new remote ICE parameters.
          this._remoteSdp.updateIceParameters(iceParameters);
          if (!this._transportReady)
              return;
          if (this._direction === 'send') {
              const offer = await this._pc.createOffer({ iceRestart: true });
              logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
          }
          else {
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
          }
      }
      async getTransportStats() {
          return this._pc.getStats();
      }
      async send({ track, encodings, codecOptions, codec }) {
          var _a;
          this._assertSendDirection();
          logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
          if (codec) {
              logger.warn('send() | codec selection is not available in %s handler', this.name);
          }
          this._sendStream.addTrack(track);
          this._pc.addTrack(track, this._sendStream);
          let offer = await this._pc.createOffer();
          let localSdpObject = sdpTransform.parse(offer.sdp);
          let offerMediaObject;
          const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
          sendingRtpParameters.codecs =
              ortc.reduceCodecs(sendingRtpParameters.codecs);
          const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
          sendingRemoteRtpParameters.codecs =
              ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          if (track.kind === 'video' && encodings && encodings.length > 1) {
              logger.debug('send() | enabling simulcast');
              localSdpObject = sdpTransform.parse(offer.sdp);
              offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'video');
              sdpPlanBUtils.addLegacySimulcast({
                  offerMediaObject,
                  track,
                  numStreams: encodings.length
              });
              offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
          }
          logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          offerMediaObject = localSdpObject.media
              .find((m) => m.type === track.kind);
          // Set RTCP CNAME.
          sendingRtpParameters.rtcp.cname =
              sdpCommonUtils.getCname({ offerMediaObject });
          // Set RTP encodings.
          sendingRtpParameters.encodings =
              sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
          // Complete encodings with given values.
          if (encodings) {
              for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
                  if (encodings[idx])
                      Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
              }
          }
          // If VP8 and there is effective simulcast, add scalabilityMode to each
          // encoding.
          if (sendingRtpParameters.encodings.length > 1 &&
              sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8') {
              for (const encoding of sendingRtpParameters.encodings) {
                  encoding.scalabilityMode = 'S1T3';
              }
          }
          this._remoteSdp.send({
              offerMediaObject,
              offerRtpParameters: sendingRtpParameters,
              answerRtpParameters: sendingRemoteRtpParameters,
              codecOptions
          });
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          const localId = String(this._nextSendLocalId);
          this._nextSendLocalId++;
          const rtpSender = this._pc.getSenders()
              .find((s) => s.track === track);
          // Insert into the map.
          this._mapSendLocalIdRtpSender.set(localId, rtpSender);
          return {
              localId: localId,
              rtpParameters: sendingRtpParameters,
              rtpSender
          };
      }
      async stopSending(localId) {
          this._assertSendDirection();
          logger.debug('stopSending() [localId:%s]', localId);
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          this._pc.removeTrack(rtpSender);
          if (rtpSender.track)
              this._sendStream.removeTrack(rtpSender.track);
          this._mapSendLocalIdRtpSender.delete(localId);
          const offer = await this._pc.createOffer();
          logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
          try {
              await this._pc.setLocalDescription(offer);
          }
          catch (error) {
              // NOTE: If there are no sending tracks, setLocalDescription() will fail with
              // "Failed to create channels". If so, ignore it.
              if (this._sendStream.getTracks().length === 0) {
                  logger.warn('stopSending() | ignoring expected error due no sending tracks: %s', error.toString());
                  return;
              }
              throw error;
          }
          if (this._pc.signalingState === 'stable')
              return;
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
      }
      async replaceTrack(localId, track) {
          this._assertSendDirection();
          if (track) {
              logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
          }
          else {
              logger.debug('replaceTrack() [localId:%s, no track]', localId);
          }
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          const oldTrack = rtpSender.track;
          await rtpSender.replaceTrack(track);
          // Remove the old track from the local stream.
          if (oldTrack)
              this._sendStream.removeTrack(oldTrack);
          // Add the new track to the local stream.
          if (track)
              this._sendStream.addTrack(track);
      }
      async setMaxSpatialLayer(localId, spatialLayer) {
          this._assertSendDirection();
          logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          const parameters = rtpSender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              if (idx <= spatialLayer)
                  encoding.active = true;
              else
                  encoding.active = false;
          });
          await rtpSender.setParameters(parameters);
      }
      async setRtpEncodingParameters(localId, params) {
          this._assertSendDirection();
          logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          const parameters = rtpSender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              parameters.encodings[idx] = { ...encoding, ...params };
          });
          await rtpSender.setParameters(parameters);
      }
      async getSenderStats(localId) {
          this._assertSendDirection();
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          return rtpSender.getStats();
      }
      async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
          var _a;
          this._assertSendDirection();
          const options = {
              negotiated: true,
              id: this._nextSendSctpStreamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmitTime: maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('sendDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // Increase next id.
          this._nextSendSctpStreamId =
              ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
          // If this is the first DataChannel we need to create the SDP answer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              const offer = await this._pc.createOffer();
              const localSdpObject = sdpTransform.parse(offer.sdp);
              const offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'application');
              if (!this._transportReady) {
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              this._remoteSdp.sendSctpAssociation({ offerMediaObject });
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          const sctpStreamParameters = {
              streamId: options.id,
              ordered: options.ordered,
              maxPacketLifeTime: options.maxPacketLifeTime,
              maxRetransmits: options.maxRetransmits
          };
          return { dataChannel, sctpStreamParameters };
      }
      async receive(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      optionsList) {
          var _a;
          this._assertRecvDirection();
          const results = [];
          for (const options of optionsList) {
              const { trackId, kind, rtpParameters } = options;
              logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
              const mid = kind;
              this._remoteSdp.receive({
                  mid,
                  kind,
                  offerRtpParameters: rtpParameters,
                  streamId: rtpParameters.rtcp.cname,
                  trackId
              });
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          let answer = await this._pc.createAnswer();
          const localSdpObject = sdpTransform.parse(answer.sdp);
          for (const options of optionsList) {
              const { kind, rtpParameters } = options;
              const mid = kind;
              const answerMediaObject = localSdpObject.media
                  .find((m) => String(m.mid) === mid);
              // May need to modify codec parameters in the answer based on codec
              // parameters in the offer.
              sdpCommonUtils.applyCodecParameters({
                  offerRtpParameters: rtpParameters,
                  answerMediaObject
              });
          }
          answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          for (const options of optionsList) {
              const { kind, trackId, rtpParameters } = options;
              const localId = trackId;
              const mid = kind;
              const rtpReceiver = this._pc.getReceivers()
                  .find((r) => r.track && r.track.id === localId);
              if (!rtpReceiver)
                  throw new Error('new RTCRtpReceiver not');
              // Insert into the map.
              this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters, rtpReceiver });
              results.push({
                  localId,
                  track: rtpReceiver.track,
                  rtpReceiver
              });
          }
          return results;
      }
      async stopReceiving(localId) {
          this._assertRecvDirection();
          logger.debug('stopReceiving() [localId:%s]', localId);
          const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
          // Remove from the map.
          this._mapRecvLocalIdInfo.delete(localId);
          this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async pauseReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async resumeReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async getReceiverStats(localId) {
          this._assertRecvDirection();
          const { rtpReceiver } = this._mapRecvLocalIdInfo.get(localId) || {};
          if (!rtpReceiver)
              throw new Error('associated RTCRtpReceiver not found');
          return rtpReceiver.getStats();
      }
      async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
          var _a;
          this._assertRecvDirection();
          const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
          const options = {
              negotiated: true,
              id: streamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmitTime: maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('receiveDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // If this is the first DataChannel we need to create the SDP offer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              if (!this._transportReady) {
                  const localSdpObject = sdpTransform.parse(answer.sdp);
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          return { dataChannel };
      }
      async _setupTransport({ localDtlsRole, localSdpObject }) {
          if (!localSdpObject)
              localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          // Get our local DTLS parameters.
          const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
          // Set our DTLS role.
          dtlsParameters.role = localDtlsRole;
          // Update the remote DTLS role in the SDP.
          this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
          // Need to tell the remote transport about our parameters.
          await new Promise((resolve, reject) => {
              this.safeEmit('@connect', { dtlsParameters }, resolve, reject);
          });
          this._transportReady = true;
      }
      _assertSendDirection() {
          if (this._direction !== 'send') {
              throw new Error('method can just be called for handlers with "send" direction');
          }
      }
      _assertRecvDirection() {
          if (this._direction !== 'recv') {
              throw new Error('method can just be called for handlers with "recv" direction');
          }
      }
  }
  exports.Chrome67 = Chrome67;
  
  },{"../Logger":44,"../ortc":67,"../utils":70,"./HandlerInterface":56,"./sdp/RemoteSdp":62,"./sdp/commonUtils":63,"./sdp/planBUtils":64,"sdp-transform":79}],52:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Chrome70 = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  const Logger_1 = require("../Logger");
  const utils = __importStar(require("../utils"));
  const ortc = __importStar(require("../ortc"));
  const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
  const sdpUnifiedPlanUtils = __importStar(require("./sdp/unifiedPlanUtils"));
  const HandlerInterface_1 = require("./HandlerInterface");
  const RemoteSdp_1 = require("./sdp/RemoteSdp");
  const scalabilityModes_1 = require("../scalabilityModes");
  const logger = new Logger_1.Logger('Chrome70');
  const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
  class Chrome70 extends HandlerInterface_1.HandlerInterface {
      constructor() {
          super();
          // Map of RTCTransceivers indexed by MID.
          this._mapMidTransceiver = new Map();
          // Local stream for sending.
          this._sendStream = new MediaStream();
          // Whether a DataChannel m=application section has been created.
          this._hasDataChannelMediaSection = false;
          // Sending DataChannel id value counter. Incremented for each new DataChannel.
          this._nextSendSctpStreamId = 0;
          // Got transport local and remote parameters.
          this._transportReady = false;
      }
      /**
       * Creates a factory function.
       */
      static createFactory() {
          return () => new Chrome70();
      }
      get name() {
          return 'Chrome70';
      }
      close() {
          logger.debug('close()');
          // Close RTCPeerConnection.
          if (this._pc) {
              try {
                  this._pc.close();
              }
              catch (error) { }
          }
      }
      async getNativeRtpCapabilities() {
          logger.debug('getNativeRtpCapabilities()');
          const pc = new RTCPeerConnection({
              iceServers: [],
              iceTransportPolicy: 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'unified-plan'
          });
          try {
              pc.addTransceiver('audio');
              pc.addTransceiver('video');
              const offer = await pc.createOffer();
              try {
                  pc.close();
              }
              catch (error) { }
              const sdpObject = sdpTransform.parse(offer.sdp);
              const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
              return nativeRtpCapabilities;
          }
          catch (error) {
              try {
                  pc.close();
              }
              catch (error2) { }
              throw error;
          }
      }
      async getNativeSctpCapabilities() {
          logger.debug('getNativeSctpCapabilities()');
          return {
              numStreams: SCTP_NUM_STREAMS
          };
      }
      run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
          logger.debug('run()');
          this._direction = direction;
          this._remoteSdp = new RemoteSdp_1.RemoteSdp({
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters
          });
          this._sendingRtpParametersByKind =
              {
                  audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
              };
          this._sendingRemoteRtpParametersByKind =
              {
                  audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
              };
          if (dtlsParameters.role && dtlsParameters.role !== 'auto') {
              this._forcedLocalDtlsRole = dtlsParameters.role === 'server'
                  ? 'client'
                  : 'server';
          }
          this._pc = new RTCPeerConnection({
              iceServers: iceServers || [],
              iceTransportPolicy: iceTransportPolicy || 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'unified-plan',
              ...additionalSettings
          }, proprietaryConstraints);
          // Handle RTCPeerConnection connection status.
          this._pc.addEventListener('iceconnectionstatechange', () => {
              switch (this._pc.iceConnectionState) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
      }
      async updateIceServers(iceServers) {
          logger.debug('updateIceServers()');
          const configuration = this._pc.getConfiguration();
          configuration.iceServers = iceServers;
          this._pc.setConfiguration(configuration);
      }
      async restartIce(iceParameters) {
          logger.debug('restartIce()');
          // Provide the remote SDP handler with new remote ICE parameters.
          this._remoteSdp.updateIceParameters(iceParameters);
          if (!this._transportReady)
              return;
          if (this._direction === 'send') {
              const offer = await this._pc.createOffer({ iceRestart: true });
              logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
          }
          else {
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
          }
      }
      async getTransportStats() {
          return this._pc.getStats();
      }
      async send({ track, encodings, codecOptions, codec }) {
          var _a;
          this._assertSendDirection();
          logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
          const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
          // This may throw.
          sendingRtpParameters.codecs =
              ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
          const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
          // This may throw.
          sendingRemoteRtpParameters.codecs =
              ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
          const mediaSectionIdx = this._remoteSdp.getNextMediaSectionIdx();
          const transceiver = this._pc.addTransceiver(track, { direction: 'sendonly', streams: [this._sendStream] });
          let offer = await this._pc.createOffer();
          let localSdpObject = sdpTransform.parse(offer.sdp);
          let offerMediaObject;
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          if (encodings && encodings.length > 1) {
              logger.debug('send() | enabling legacy simulcast');
              localSdpObject = sdpTransform.parse(offer.sdp);
              offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
              sdpUnifiedPlanUtils.addLegacySimulcast({
                  offerMediaObject,
                  numStreams: encodings.length
              });
              offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
          }
          // Special case for VP9 with SVC.
          let hackVp9Svc = false;
          const layers = (0, scalabilityModes_1.parse)((encodings || [{}])[0].scalabilityMode);
          if (encodings &&
              encodings.length === 1 &&
              layers.spatialLayers > 1 &&
              sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp9') {
              logger.debug('send() | enabling legacy simulcast for VP9 SVC');
              hackVp9Svc = true;
              localSdpObject = sdpTransform.parse(offer.sdp);
              offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
              sdpUnifiedPlanUtils.addLegacySimulcast({
                  offerMediaObject,
                  numStreams: layers.spatialLayers
              });
              offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
          }
          logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          // If encodings are given, apply them now.
          if (encodings) {
              logger.debug('send() | applying given encodings');
              const parameters = transceiver.sender.getParameters();
              for (let idx = 0; idx < (parameters.encodings || []).length; ++idx) {
                  const encoding = parameters.encodings[idx];
                  const desiredEncoding = encodings[idx];
                  // Should not happen but just in case.
                  if (!desiredEncoding)
                      break;
                  parameters.encodings[idx] = Object.assign(encoding, desiredEncoding);
              }
              await transceiver.sender.setParameters(parameters);
          }
          // We can now get the transceiver.mid.
          const localId = transceiver.mid;
          // Set MID.
          sendingRtpParameters.mid = localId;
          localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
          // Set RTCP CNAME.
          sendingRtpParameters.rtcp.cname =
              sdpCommonUtils.getCname({ offerMediaObject });
          // Set RTP encodings.
          sendingRtpParameters.encodings =
              sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
          // Complete encodings with given values.
          if (encodings) {
              for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
                  if (encodings[idx])
                      Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
              }
          }
          // Hack for VP9 SVC.
          if (hackVp9Svc) {
              sendingRtpParameters.encodings = [sendingRtpParameters.encodings[0]];
          }
          // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
          // each encoding.
          if (sendingRtpParameters.encodings.length > 1 &&
              (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
                  sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
              for (const encoding of sendingRtpParameters.encodings) {
                  encoding.scalabilityMode = 'S1T3';
              }
          }
          this._remoteSdp.send({
              offerMediaObject,
              reuseMid: mediaSectionIdx.reuseMid,
              offerRtpParameters: sendingRtpParameters,
              answerRtpParameters: sendingRemoteRtpParameters,
              codecOptions
          });
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          // Store in the map.
          this._mapMidTransceiver.set(localId, transceiver);
          return {
              localId,
              rtpParameters: sendingRtpParameters,
              rtpSender: transceiver.sender
          };
      }
      async stopSending(localId) {
          this._assertSendDirection();
          logger.debug('stopSending() [localId:%s]', localId);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          transceiver.sender.replaceTrack(null);
          this._pc.removeTrack(transceiver.sender);
          this._remoteSdp.closeMediaSection(transceiver.mid);
          const offer = await this._pc.createOffer();
          logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          this._mapMidTransceiver.delete(localId);
      }
      async replaceTrack(localId, track) {
          this._assertSendDirection();
          if (track) {
              logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
          }
          else {
              logger.debug('replaceTrack() [localId:%s, no track]', localId);
          }
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          await transceiver.sender.replaceTrack(track);
      }
      async setMaxSpatialLayer(localId, spatialLayer) {
          this._assertSendDirection();
          logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          const parameters = transceiver.sender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              if (idx <= spatialLayer)
                  encoding.active = true;
              else
                  encoding.active = false;
          });
          await transceiver.sender.setParameters(parameters);
      }
      async setRtpEncodingParameters(localId, params) {
          this._assertSendDirection();
          logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          const parameters = transceiver.sender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              parameters.encodings[idx] = { ...encoding, ...params };
          });
          await transceiver.sender.setParameters(parameters);
      }
      async getSenderStats(localId) {
          this._assertSendDirection();
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          return transceiver.sender.getStats();
      }
      async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
          var _a;
          this._assertSendDirection();
          const options = {
              negotiated: true,
              id: this._nextSendSctpStreamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmitTime: maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('sendDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // Increase next id.
          this._nextSendSctpStreamId =
              ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
          // If this is the first DataChannel we need to create the SDP answer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              const offer = await this._pc.createOffer();
              const localSdpObject = sdpTransform.parse(offer.sdp);
              const offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'application');
              if (!this._transportReady) {
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              this._remoteSdp.sendSctpAssociation({ offerMediaObject });
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          const sctpStreamParameters = {
              streamId: options.id,
              ordered: options.ordered,
              maxPacketLifeTime: options.maxPacketLifeTime,
              maxRetransmits: options.maxRetransmits
          };
          return { dataChannel, sctpStreamParameters };
      }
      async receive(optionsList) {
          var _a;
          this._assertRecvDirection();
          const results = [];
          const mapLocalId = new Map();
          for (const options of optionsList) {
              const { trackId, kind, rtpParameters } = options;
              logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
              const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
              mapLocalId.set(trackId, localId);
              this._remoteSdp.receive({
                  mid: localId,
                  kind,
                  offerRtpParameters: rtpParameters,
                  streamId: rtpParameters.rtcp.cname,
                  trackId
              });
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          let answer = await this._pc.createAnswer();
          const localSdpObject = sdpTransform.parse(answer.sdp);
          for (const options of optionsList) {
              const { trackId, rtpParameters } = options;
              const localId = mapLocalId.get(trackId);
              const answerMediaObject = localSdpObject.media
                  .find((m) => String(m.mid) === localId);
              // May need to modify codec parameters in the answer based on codec
              // parameters in the offer.
              sdpCommonUtils.applyCodecParameters({
                  offerRtpParameters: rtpParameters,
                  answerMediaObject
              });
          }
          answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          for (const options of optionsList) {
              const { trackId } = options;
              const localId = mapLocalId.get(trackId);
              const transceiver = this._pc.getTransceivers()
                  .find((t) => t.mid === localId);
              if (!transceiver)
                  throw new Error('new RTCRtpTransceiver not found');
              // Store in the map.
              this._mapMidTransceiver.set(localId, transceiver);
              results.push({
                  localId,
                  track: transceiver.receiver.track,
                  rtpReceiver: transceiver.receiver
              });
          }
          return results;
      }
      async stopReceiving(localId) {
          this._assertRecvDirection();
          logger.debug('stopReceiving() [localId:%s]', localId);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          this._remoteSdp.closeMediaSection(transceiver.mid);
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          this._mapMidTransceiver.delete(localId);
      }
      async pauseReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async resumeReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async getReceiverStats(localId) {
          this._assertRecvDirection();
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          return transceiver.receiver.getStats();
      }
      async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
          var _a;
          this._assertRecvDirection();
          const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
          const options = {
              negotiated: true,
              id: streamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmitTime: maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('receiveDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // If this is the first DataChannel we need to create the SDP offer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              this._remoteSdp.receiveSctpAssociation();
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              if (!this._transportReady) {
                  const localSdpObject = sdpTransform.parse(answer.sdp);
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          return { dataChannel };
      }
      async _setupTransport({ localDtlsRole, localSdpObject }) {
          if (!localSdpObject)
              localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          // Get our local DTLS parameters.
          const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
          // Set our DTLS role.
          dtlsParameters.role = localDtlsRole;
          // Update the remote DTLS role in the SDP.
          this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
          // Need to tell the remote transport about our parameters.
          await new Promise((resolve, reject) => {
              this.safeEmit('@connect', { dtlsParameters }, resolve, reject);
          });
          this._transportReady = true;
      }
      _assertSendDirection() {
          if (this._direction !== 'send') {
              throw new Error('method can just be called for handlers with "send" direction');
          }
      }
      _assertRecvDirection() {
          if (this._direction !== 'recv') {
              throw new Error('method can just be called for handlers with "recv" direction');
          }
      }
  }
  exports.Chrome70 = Chrome70;
  
  },{"../Logger":44,"../ortc":67,"../scalabilityModes":68,"../utils":70,"./HandlerInterface":56,"./sdp/RemoteSdp":62,"./sdp/commonUtils":63,"./sdp/unifiedPlanUtils":65,"sdp-transform":79}],53:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Chrome74 = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  const Logger_1 = require("../Logger");
  const utils = __importStar(require("../utils"));
  const ortc = __importStar(require("../ortc"));
  const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
  const sdpUnifiedPlanUtils = __importStar(require("./sdp/unifiedPlanUtils"));
  const HandlerInterface_1 = require("./HandlerInterface");
  const RemoteSdp_1 = require("./sdp/RemoteSdp");
  const scalabilityModes_1 = require("../scalabilityModes");
  const logger = new Logger_1.Logger('Chrome74');
  const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
  class Chrome74 extends HandlerInterface_1.HandlerInterface {
      constructor() {
          super();
          // Map of RTCTransceivers indexed by MID.
          this._mapMidTransceiver = new Map();
          // Local stream for sending.
          this._sendStream = new MediaStream();
          // Whether a DataChannel m=application section has been created.
          this._hasDataChannelMediaSection = false;
          // Sending DataChannel id value counter. Incremented for each new DataChannel.
          this._nextSendSctpStreamId = 0;
          // Got transport local and remote parameters.
          this._transportReady = false;
      }
      /**
       * Creates a factory function.
       */
      static createFactory() {
          return () => new Chrome74();
      }
      get name() {
          return 'Chrome74';
      }
      close() {
          logger.debug('close()');
          // Close RTCPeerConnection.
          if (this._pc) {
              try {
                  this._pc.close();
              }
              catch (error) { }
          }
      }
      async getNativeRtpCapabilities() {
          logger.debug('getNativeRtpCapabilities()');
          const pc = new RTCPeerConnection({
              iceServers: [],
              iceTransportPolicy: 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'unified-plan'
          });
          try {
              pc.addTransceiver('audio');
              pc.addTransceiver('video');
              const offer = await pc.createOffer();
              try {
                  pc.close();
              }
              catch (error) { }
              const sdpObject = sdpTransform.parse(offer.sdp);
              const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
              return nativeRtpCapabilities;
          }
          catch (error) {
              try {
                  pc.close();
              }
              catch (error2) { }
              throw error;
          }
      }
      async getNativeSctpCapabilities() {
          logger.debug('getNativeSctpCapabilities()');
          return {
              numStreams: SCTP_NUM_STREAMS
          };
      }
      run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
          logger.debug('run()');
          this._direction = direction;
          this._remoteSdp = new RemoteSdp_1.RemoteSdp({
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters
          });
          this._sendingRtpParametersByKind =
              {
                  audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
              };
          this._sendingRemoteRtpParametersByKind =
              {
                  audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
              };
          if (dtlsParameters.role && dtlsParameters.role !== 'auto') {
              this._forcedLocalDtlsRole = dtlsParameters.role === 'server'
                  ? 'client'
                  : 'server';
          }
          this._pc = new RTCPeerConnection({
              iceServers: iceServers || [],
              iceTransportPolicy: iceTransportPolicy || 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'unified-plan',
              ...additionalSettings
          }, proprietaryConstraints);
          // Handle RTCPeerConnection connection status.
          this._pc.addEventListener('iceconnectionstatechange', () => {
              switch (this._pc.iceConnectionState) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
      }
      async updateIceServers(iceServers) {
          logger.debug('updateIceServers()');
          const configuration = this._pc.getConfiguration();
          configuration.iceServers = iceServers;
          this._pc.setConfiguration(configuration);
      }
      async restartIce(iceParameters) {
          logger.debug('restartIce()');
          // Provide the remote SDP handler with new remote ICE parameters.
          this._remoteSdp.updateIceParameters(iceParameters);
          if (!this._transportReady)
              return;
          if (this._direction === 'send') {
              const offer = await this._pc.createOffer({ iceRestart: true });
              logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
          }
          else {
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
          }
      }
      async getTransportStats() {
          return this._pc.getStats();
      }
      async send({ track, encodings, codecOptions, codec }) {
          var _a;
          this._assertSendDirection();
          logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
          if (encodings && encodings.length > 1) {
              encodings.forEach((encoding, idx) => {
                  encoding.rid = `r${idx}`;
              });
          }
          const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
          // This may throw.
          sendingRtpParameters.codecs =
              ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
          const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
          // This may throw.
          sendingRemoteRtpParameters.codecs =
              ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
          const mediaSectionIdx = this._remoteSdp.getNextMediaSectionIdx();
          const transceiver = this._pc.addTransceiver(track, {
              direction: 'sendonly',
              streams: [this._sendStream],
              sendEncodings: encodings
          });
          let offer = await this._pc.createOffer();
          let localSdpObject = sdpTransform.parse(offer.sdp);
          let offerMediaObject;
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          // Special case for VP9 with SVC.
          let hackVp9Svc = false;
          const layers = (0, scalabilityModes_1.parse)((encodings || [{}])[0].scalabilityMode);
          if (encodings &&
              encodings.length === 1 &&
              layers.spatialLayers > 1 &&
              sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp9') {
              logger.debug('send() | enabling legacy simulcast for VP9 SVC');
              hackVp9Svc = true;
              localSdpObject = sdpTransform.parse(offer.sdp);
              offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
              sdpUnifiedPlanUtils.addLegacySimulcast({
                  offerMediaObject,
                  numStreams: layers.spatialLayers
              });
              offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
          }
          logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          // We can now get the transceiver.mid.
          const localId = transceiver.mid;
          // Set MID.
          sendingRtpParameters.mid = localId;
          localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
          // Set RTCP CNAME.
          sendingRtpParameters.rtcp.cname =
              sdpCommonUtils.getCname({ offerMediaObject });
          // Set RTP encodings by parsing the SDP offer if no encodings are given.
          if (!encodings) {
              sendingRtpParameters.encodings =
                  sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
          }
          // Set RTP encodings by parsing the SDP offer and complete them with given
          // one if just a single encoding has been given.
          else if (encodings.length === 1) {
              let newEncodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
              Object.assign(newEncodings[0], encodings[0]);
              // Hack for VP9 SVC.
              if (hackVp9Svc)
                  newEncodings = [newEncodings[0]];
              sendingRtpParameters.encodings = newEncodings;
          }
          // Otherwise if more than 1 encoding are given use them verbatim.
          else {
              sendingRtpParameters.encodings = encodings;
          }
          // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
          // each encoding.
          if (sendingRtpParameters.encodings.length > 1 &&
              (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
                  sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
              for (const encoding of sendingRtpParameters.encodings) {
                  encoding.scalabilityMode = 'S1T3';
              }
          }
          this._remoteSdp.send({
              offerMediaObject,
              reuseMid: mediaSectionIdx.reuseMid,
              offerRtpParameters: sendingRtpParameters,
              answerRtpParameters: sendingRemoteRtpParameters,
              codecOptions,
              extmapAllowMixed: true
          });
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          // Store in the map.
          this._mapMidTransceiver.set(localId, transceiver);
          return {
              localId,
              rtpParameters: sendingRtpParameters,
              rtpSender: transceiver.sender
          };
      }
      async stopSending(localId) {
          this._assertSendDirection();
          logger.debug('stopSending() [localId:%s]', localId);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          transceiver.sender.replaceTrack(null);
          this._pc.removeTrack(transceiver.sender);
          this._remoteSdp.closeMediaSection(transceiver.mid);
          const offer = await this._pc.createOffer();
          logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          this._mapMidTransceiver.delete(localId);
      }
      async replaceTrack(localId, track) {
          this._assertSendDirection();
          if (track) {
              logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
          }
          else {
              logger.debug('replaceTrack() [localId:%s, no track]', localId);
          }
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          await transceiver.sender.replaceTrack(track);
      }
      async setMaxSpatialLayer(localId, spatialLayer) {
          this._assertSendDirection();
          logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          const parameters = transceiver.sender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              if (idx <= spatialLayer)
                  encoding.active = true;
              else
                  encoding.active = false;
          });
          await transceiver.sender.setParameters(parameters);
      }
      async setRtpEncodingParameters(localId, params) {
          this._assertSendDirection();
          logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          const parameters = transceiver.sender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              parameters.encodings[idx] = { ...encoding, ...params };
          });
          await transceiver.sender.setParameters(parameters);
      }
      async getSenderStats(localId) {
          this._assertSendDirection();
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          return transceiver.sender.getStats();
      }
      async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
          var _a;
          this._assertSendDirection();
          const options = {
              negotiated: true,
              id: this._nextSendSctpStreamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('sendDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // Increase next id.
          this._nextSendSctpStreamId =
              ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
          // If this is the first DataChannel we need to create the SDP answer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              const offer = await this._pc.createOffer();
              const localSdpObject = sdpTransform.parse(offer.sdp);
              const offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'application');
              if (!this._transportReady) {
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              this._remoteSdp.sendSctpAssociation({ offerMediaObject });
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          const sctpStreamParameters = {
              streamId: options.id,
              ordered: options.ordered,
              maxPacketLifeTime: options.maxPacketLifeTime,
              maxRetransmits: options.maxRetransmits
          };
          return { dataChannel, sctpStreamParameters };
      }
      async receive(optionsList) {
          var _a;
          this._assertRecvDirection();
          const results = [];
          const mapLocalId = new Map();
          for (const options of optionsList) {
              const { trackId, kind, rtpParameters } = options;
              logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
              const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
              mapLocalId.set(trackId, localId);
              this._remoteSdp.receive({
                  mid: localId,
                  kind,
                  offerRtpParameters: rtpParameters,
                  streamId: rtpParameters.rtcp.cname,
                  trackId
              });
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          let answer = await this._pc.createAnswer();
          const localSdpObject = sdpTransform.parse(answer.sdp);
          for (const options of optionsList) {
              const { trackId, rtpParameters } = options;
              const localId = mapLocalId.get(trackId);
              const answerMediaObject = localSdpObject.media
                  .find((m) => String(m.mid) === localId);
              // May need to modify codec parameters in the answer based on codec
              // parameters in the offer.
              sdpCommonUtils.applyCodecParameters({
                  offerRtpParameters: rtpParameters,
                  answerMediaObject
              });
          }
          answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          for (const options of optionsList) {
              const { trackId } = options;
              const localId = mapLocalId.get(trackId);
              const transceiver = this._pc.getTransceivers()
                  .find((t) => t.mid === localId);
              if (!transceiver) {
                  throw new Error('new RTCRtpTransceiver not found');
              }
              else {
                  // Store in the map.
                  this._mapMidTransceiver.set(localId, transceiver);
                  results.push({
                      localId,
                      track: transceiver.receiver.track,
                      rtpReceiver: transceiver.receiver
                  });
              }
          }
          return results;
      }
      async stopReceiving(localId) {
          this._assertRecvDirection();
          logger.debug('stopReceiving() [localId:%s]', localId);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          this._remoteSdp.closeMediaSection(transceiver.mid);
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          this._mapMidTransceiver.delete(localId);
      }
      async pauseReceiving(localIds) {
          this._assertRecvDirection();
          for (const localId of localIds) {
              logger.debug('pauseReceiving() [localId:%s]', localId);
              const transceiver = this._mapMidTransceiver.get(localId);
              if (!transceiver)
                  throw new Error('associated RTCRtpTransceiver not found');
              transceiver.direction = 'inactive';
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('pauseReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('pauseReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async resumeReceiving(localIds) {
          this._assertRecvDirection();
          for (const localId of localIds) {
              logger.debug('resumeReceiving() [localId:%s]', localId);
              const transceiver = this._mapMidTransceiver.get(localId);
              if (!transceiver)
                  throw new Error('associated RTCRtpTransceiver not found');
              transceiver.direction = 'recvonly';
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('resumeReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('resumeReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async getReceiverStats(localId) {
          this._assertRecvDirection();
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          return transceiver.receiver.getStats();
      }
      async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
          var _a;
          this._assertRecvDirection();
          const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
          const options = {
              negotiated: true,
              id: streamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('receiveDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // If this is the first DataChannel we need to create the SDP offer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              this._remoteSdp.receiveSctpAssociation();
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              if (!this._transportReady) {
                  const localSdpObject = sdpTransform.parse(answer.sdp);
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          return { dataChannel };
      }
      async _setupTransport({ localDtlsRole, localSdpObject }) {
          if (!localSdpObject)
              localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          // Get our local DTLS parameters.
          const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
          // Set our DTLS role.
          dtlsParameters.role = localDtlsRole;
          // Update the remote DTLS role in the SDP.
          this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
          // Need to tell the remote transport about our parameters.
          await new Promise((resolve, reject) => {
              this.safeEmit('@connect', { dtlsParameters }, resolve, reject);
          });
          this._transportReady = true;
      }
      _assertSendDirection() {
          if (this._direction !== 'send') {
              throw new Error('method can just be called for handlers with "send" direction');
          }
      }
      _assertRecvDirection() {
          if (this._direction !== 'recv') {
              throw new Error('method can just be called for handlers with "recv" direction');
          }
      }
  }
  exports.Chrome74 = Chrome74;
  
  },{"../Logger":44,"../ortc":67,"../scalabilityModes":68,"../utils":70,"./HandlerInterface":56,"./sdp/RemoteSdp":62,"./sdp/commonUtils":63,"./sdp/unifiedPlanUtils":65,"sdp-transform":79}],54:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Edge11 = void 0;
  const Logger_1 = require("../Logger");
  const errors_1 = require("../errors");
  const utils = __importStar(require("../utils"));
  const ortc = __importStar(require("../ortc"));
  const edgeUtils = __importStar(require("./ortc/edgeUtils"));
  const HandlerInterface_1 = require("./HandlerInterface");
  const logger = new Logger_1.Logger('Edge11');
  class Edge11 extends HandlerInterface_1.HandlerInterface {
      constructor() {
          super();
          // Map of RTCRtpSenders indexed by id.
          this._rtpSenders = new Map();
          // Map of RTCRtpReceivers indexed by id.
          this._rtpReceivers = new Map();
          // Next localId for sending tracks.
          this._nextSendLocalId = 0;
          // Got transport local and remote parameters.
          this._transportReady = false;
      }
      /**
       * Creates a factory function.
       */
      static createFactory() {
          return () => new Edge11();
      }
      get name() {
          return 'Edge11';
      }
      close() {
          logger.debug('close()');
          // Close the ICE gatherer.
          // NOTE: Not yet implemented by Edge.
          try {
              this._iceGatherer.close();
          }
          catch (error) { }
          // Close the ICE transport.
          try {
              this._iceTransport.stop();
          }
          catch (error) { }
          // Close the DTLS transport.
          try {
              this._dtlsTransport.stop();
          }
          catch (error) { }
          // Close RTCRtpSenders.
          for (const rtpSender of this._rtpSenders.values()) {
              try {
                  rtpSender.stop();
              }
              catch (error) { }
          }
          // Close RTCRtpReceivers.
          for (const rtpReceiver of this._rtpReceivers.values()) {
              try {
                  rtpReceiver.stop();
              }
              catch (error) { }
          }
      }
      async getNativeRtpCapabilities() {
          logger.debug('getNativeRtpCapabilities()');
          return edgeUtils.getCapabilities();
      }
      async getNativeSctpCapabilities() {
          logger.debug('getNativeSctpCapabilities()');
          return {
              numStreams: { OS: 0, MIS: 0 }
          };
      }
      run({ direction, // eslint-disable-line @typescript-eslint/no-unused-vars
      iceParameters, iceCandidates, dtlsParameters, sctpParameters, // eslint-disable-line @typescript-eslint/no-unused-vars
      iceServers, iceTransportPolicy, additionalSettings, // eslint-disable-line @typescript-eslint/no-unused-vars
      proprietaryConstraints, // eslint-disable-line @typescript-eslint/no-unused-vars
      extendedRtpCapabilities }) {
          logger.debug('run()');
          this._sendingRtpParametersByKind =
              {
                  audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
              };
          this._remoteIceParameters = iceParameters;
          this._remoteIceCandidates = iceCandidates;
          this._remoteDtlsParameters = dtlsParameters;
          this._cname = `CNAME-${utils.generateRandomNumber()}`;
          this._setIceGatherer({ iceServers, iceTransportPolicy });
          this._setIceTransport();
          this._setDtlsTransport();
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async updateIceServers(iceServers) {
          // NOTE: Edge 11 does not implement iceGatherer.gater().
          throw new errors_1.UnsupportedError('not supported');
      }
      async restartIce(iceParameters) {
          logger.debug('restartIce()');
          this._remoteIceParameters = iceParameters;
          if (!this._transportReady)
              return;
          logger.debug('restartIce() | calling iceTransport.start()');
          this._iceTransport.start(this._iceGatherer, iceParameters, 'controlling');
          for (const candidate of this._remoteIceCandidates) {
              this._iceTransport.addRemoteCandidate(candidate);
          }
          this._iceTransport.addRemoteCandidate({});
      }
      async getTransportStats() {
          return this._iceTransport.getStats();
      }
      async send(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      { track, encodings, codecOptions, codec }) {
          logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
          if (!this._transportReady)
              await this._setupTransport({ localDtlsRole: 'server' });
          logger.debug('send() | calling new RTCRtpSender()');
          const rtpSender = new RTCRtpSender(track, this._dtlsTransport);
          const rtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
          rtpParameters.codecs = ortc.reduceCodecs(rtpParameters.codecs, codec);
          const useRtx = rtpParameters.codecs
              .some((_codec) => /.+\/rtx$/i.test(_codec.mimeType));
          if (!encodings)
              encodings = [{}];
          for (const encoding of encodings) {
              encoding.ssrc = utils.generateRandomNumber();
              if (useRtx)
                  encoding.rtx = { ssrc: utils.generateRandomNumber() };
          }
          rtpParameters.encodings = encodings;
          // Fill RTCRtpParameters.rtcp.
          rtpParameters.rtcp =
              {
                  cname: this._cname,
                  reducedSize: true,
                  mux: true
              };
          // NOTE: Convert our standard RTCRtpParameters into those that Edge
          // expects.
          const edgeRtpParameters = edgeUtils.mangleRtpParameters(rtpParameters);
          logger.debug('send() | calling rtpSender.send() [params:%o]', edgeRtpParameters);
          await rtpSender.send(edgeRtpParameters);
          const localId = String(this._nextSendLocalId);
          this._nextSendLocalId++;
          // Store it.
          this._rtpSenders.set(localId, rtpSender);
          return { localId, rtpParameters, rtpSender };
      }
      async stopSending(localId) {
          logger.debug('stopSending() [localId:%s]', localId);
          const rtpSender = this._rtpSenders.get(localId);
          if (!rtpSender)
              throw new Error('RTCRtpSender not found');
          this._rtpSenders.delete(localId);
          try {
              logger.debug('stopSending() | calling rtpSender.stop()');
              rtpSender.stop();
          }
          catch (error) {
              logger.warn('stopSending() | rtpSender.stop() failed:%o', error);
              throw error;
          }
      }
      async replaceTrack(localId, track) {
          if (track) {
              logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
          }
          else {
              logger.debug('replaceTrack() [localId:%s, no track]', localId);
          }
          const rtpSender = this._rtpSenders.get(localId);
          if (!rtpSender)
              throw new Error('RTCRtpSender not found');
          rtpSender.setTrack(track);
      }
      async setMaxSpatialLayer(localId, spatialLayer) {
          logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
          const rtpSender = this._rtpSenders.get(localId);
          if (!rtpSender)
              throw new Error('RTCRtpSender not found');
          const parameters = rtpSender.getParameters();
          parameters.encodings
              .forEach((encoding, idx) => {
              if (idx <= spatialLayer)
                  encoding.active = true;
              else
                  encoding.active = false;
          });
          await rtpSender.setParameters(parameters);
      }
      async setRtpEncodingParameters(localId, params) {
          logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
          const rtpSender = this._rtpSenders.get(localId);
          if (!rtpSender)
              throw new Error('RTCRtpSender not found');
          const parameters = rtpSender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              parameters.encodings[idx] = { ...encoding, ...params };
          });
          await rtpSender.setParameters(parameters);
      }
      async getSenderStats(localId) {
          const rtpSender = this._rtpSenders.get(localId);
          if (!rtpSender)
              throw new Error('RTCRtpSender not found');
          return rtpSender.getStats();
      }
      async sendDataChannel(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      options) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      async receive(optionsList) {
          const results = [];
          for (const options of optionsList) {
              const { trackId, kind } = options;
              logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
          }
          if (!this._transportReady)
              await this._setupTransport({ localDtlsRole: 'server' });
          for (const options of optionsList) {
              const { trackId, kind, rtpParameters } = options;
              logger.debug('receive() | calling new RTCRtpReceiver()');
              const rtpReceiver = new RTCRtpReceiver(this._dtlsTransport, kind);
              rtpReceiver.addEventListener('error', (event) => {
                  logger.error('rtpReceiver "error" event [event:%o]', event);
              });
              // NOTE: Convert our standard RTCRtpParameters into those that Edge
              // expects.
              const edgeRtpParameters = edgeUtils.mangleRtpParameters(rtpParameters);
              logger.debug('receive() | calling rtpReceiver.receive() [params:%o]', edgeRtpParameters);
              await rtpReceiver.receive(edgeRtpParameters);
              const localId = trackId;
              // Store it.
              this._rtpReceivers.set(localId, rtpReceiver);
              results.push({
                  localId,
                  track: rtpReceiver.track,
                  rtpReceiver
              });
          }
          return results;
      }
      async stopReceiving(localId) {
          logger.debug('stopReceiving() [localId:%s]', localId);
          const rtpReceiver = this._rtpReceivers.get(localId);
          if (!rtpReceiver)
              throw new Error('RTCRtpReceiver not found');
          this._rtpReceivers.delete(localId);
          try {
              logger.debug('stopReceiving() | calling rtpReceiver.stop()');
              rtpReceiver.stop();
          }
          catch (error) {
              logger.warn('stopReceiving() | rtpReceiver.stop() failed:%o', error);
          }
      }
      async pauseReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async resumeReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async getReceiverStats(localId) {
          const rtpReceiver = this._rtpReceivers.get(localId);
          if (!rtpReceiver)
              throw new Error('RTCRtpReceiver not found');
          return rtpReceiver.getStats();
      }
      async receiveDataChannel(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      options) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      _setIceGatherer({ iceServers, iceTransportPolicy }) {
          // @ts-ignore
          const iceGatherer = new RTCIceGatherer({
              iceServers: iceServers || [],
              gatherPolicy: iceTransportPolicy || 'all'
          });
          iceGatherer.addEventListener('error', (event) => {
              logger.error('iceGatherer "error" event [event:%o]', event);
          });
          // NOTE: Not yet implemented by Edge, which starts gathering automatically.
          try {
              iceGatherer.gather();
          }
          catch (error) {
              logger.debug('_setIceGatherer() | iceGatherer.gather() failed: %s', error.toString());
          }
          this._iceGatherer = iceGatherer;
      }
      _setIceTransport() {
          const iceTransport = new RTCIceTransport(this._iceGatherer);
          // NOTE: Not yet implemented by Edge.
          iceTransport.addEventListener('statechange', () => {
              switch (iceTransport.state) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
          // NOTE: Not standard, but implemented by Edge.
          iceTransport.addEventListener('icestatechange', () => {
              switch (iceTransport.state) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
          iceTransport.addEventListener('candidatepairchange', (event) => {
              logger.debug('iceTransport "candidatepairchange" event [pair:%o]', event.pair);
          });
          this._iceTransport = iceTransport;
      }
      _setDtlsTransport() {
          const dtlsTransport = new RTCDtlsTransport(this._iceTransport);
          // NOTE: Not yet implemented by Edge.
          dtlsTransport.addEventListener('statechange', () => {
              logger.debug('dtlsTransport "statechange" event [state:%s]', dtlsTransport.state);
          });
          // NOTE: Not standard, but implemented by Edge.
          dtlsTransport.addEventListener('dtlsstatechange', () => {
              logger.debug('dtlsTransport "dtlsstatechange" event [state:%s]', dtlsTransport.state);
              if (dtlsTransport.state === 'closed')
                  this.emit('@connectionstatechange', 'closed');
          });
          dtlsTransport.addEventListener('error', (event) => {
              logger.error('dtlsTransport "error" event [event:%o]', event);
          });
          this._dtlsTransport = dtlsTransport;
      }
      async _setupTransport({ localDtlsRole }) {
          logger.debug('_setupTransport()');
          // Get our local DTLS parameters.
          const dtlsParameters = this._dtlsTransport.getLocalParameters();
          dtlsParameters.role = localDtlsRole;
          // Need to tell the remote transport about our parameters.
          await new Promise((resolve, reject) => {
              this.safeEmit('@connect', { dtlsParameters }, resolve, reject);
          });
          // Start the RTCIceTransport.
          this._iceTransport.start(this._iceGatherer, this._remoteIceParameters, 'controlling');
          // Add remote ICE candidates.
          for (const candidate of this._remoteIceCandidates) {
              this._iceTransport.addRemoteCandidate(candidate);
          }
          // Also signal a 'complete' candidate as per spec.
          // NOTE: It should be {complete: true} but Edge prefers {}.
          // NOTE: If we don't signal end of candidates, the Edge RTCIceTransport
          // won't enter the 'completed' state.
          this._iceTransport.addRemoteCandidate({});
          // NOTE: Edge does not like SHA less than 256.
          this._remoteDtlsParameters.fingerprints = this._remoteDtlsParameters.fingerprints
              .filter((fingerprint) => {
              return (fingerprint.algorithm === 'sha-256' ||
                  fingerprint.algorithm === 'sha-384' ||
                  fingerprint.algorithm === 'sha-512');
          });
          // Start the RTCDtlsTransport.
          this._dtlsTransport.start(this._remoteDtlsParameters);
          this._transportReady = true;
      }
  }
  exports.Edge11 = Edge11;
  
  },{"../Logger":44,"../errors":49,"../ortc":67,"../utils":70,"./HandlerInterface":56,"./ortc/edgeUtils":60}],55:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Firefox60 = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  const Logger_1 = require("../Logger");
  const errors_1 = require("../errors");
  const utils = __importStar(require("../utils"));
  const ortc = __importStar(require("../ortc"));
  const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
  const sdpUnifiedPlanUtils = __importStar(require("./sdp/unifiedPlanUtils"));
  const HandlerInterface_1 = require("./HandlerInterface");
  const RemoteSdp_1 = require("./sdp/RemoteSdp");
  const logger = new Logger_1.Logger('Firefox60');
  const SCTP_NUM_STREAMS = { OS: 16, MIS: 2048 };
  class Firefox60 extends HandlerInterface_1.HandlerInterface {
      constructor() {
          super();
          // Map of RTCTransceivers indexed by MID.
          this._mapMidTransceiver = new Map();
          // Local stream for sending.
          this._sendStream = new MediaStream();
          // Whether a DataChannel m=application section has been created.
          this._hasDataChannelMediaSection = false;
          // Sending DataChannel id value counter. Incremented for each new DataChannel.
          this._nextSendSctpStreamId = 0;
          // Got transport local and remote parameters.
          this._transportReady = false;
      }
      /**
       * Creates a factory function.
       */
      static createFactory() {
          return () => new Firefox60();
      }
      get name() {
          return 'Firefox60';
      }
      close() {
          logger.debug('close()');
          // Close RTCPeerConnection.
          if (this._pc) {
              try {
                  this._pc.close();
              }
              catch (error) { }
          }
      }
      async getNativeRtpCapabilities() {
          logger.debug('getNativeRtpCapabilities()');
          const pc = new RTCPeerConnection({
              iceServers: [],
              iceTransportPolicy: 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require'
          });
          // NOTE: We need to add a real video track to get the RID extension mapping.
          const canvas = document.createElement('canvas');
          // NOTE: Otherwise Firefox fails in next line.
          canvas.getContext('2d');
          const fakeStream = canvas.captureStream();
          const fakeVideoTrack = fakeStream.getVideoTracks()[0];
          try {
              pc.addTransceiver('audio', { direction: 'sendrecv' });
              const videoTransceiver = pc.addTransceiver(fakeVideoTrack, { direction: 'sendrecv' });
              const parameters = videoTransceiver.sender.getParameters();
              const encodings = [
                  { rid: 'r0', maxBitrate: 100000 },
                  { rid: 'r1', maxBitrate: 500000 }
              ];
              parameters.encodings = encodings;
              await videoTransceiver.sender.setParameters(parameters);
              const offer = await pc.createOffer();
              try {
                  canvas.remove();
              }
              catch (error) { }
              try {
                  fakeVideoTrack.stop();
              }
              catch (error) { }
              try {
                  pc.close();
              }
              catch (error) { }
              const sdpObject = sdpTransform.parse(offer.sdp);
              const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
              return nativeRtpCapabilities;
          }
          catch (error) {
              try {
                  canvas.remove();
              }
              catch (error2) { }
              try {
                  fakeVideoTrack.stop();
              }
              catch (error2) { }
              try {
                  pc.close();
              }
              catch (error2) { }
              throw error;
          }
      }
      async getNativeSctpCapabilities() {
          logger.debug('getNativeSctpCapabilities()');
          return {
              numStreams: SCTP_NUM_STREAMS
          };
      }
      run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
          logger.debug('run()');
          this._direction = direction;
          this._remoteSdp = new RemoteSdp_1.RemoteSdp({
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters
          });
          this._sendingRtpParametersByKind =
              {
                  audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
              };
          this._sendingRemoteRtpParametersByKind =
              {
                  audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
              };
          this._pc = new RTCPeerConnection({
              iceServers: iceServers || [],
              iceTransportPolicy: iceTransportPolicy || 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              ...additionalSettings
          }, proprietaryConstraints);
          // Handle RTCPeerConnection connection status.
          this._pc.addEventListener('iceconnectionstatechange', () => {
              switch (this._pc.iceConnectionState) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async updateIceServers(iceServers) {
          // NOTE: Firefox does not implement pc.setConfiguration().
          throw new errors_1.UnsupportedError('not supported');
      }
      async restartIce(iceParameters) {
          logger.debug('restartIce()');
          // Provide the remote SDP handler with new remote ICE parameters.
          this._remoteSdp.updateIceParameters(iceParameters);
          if (!this._transportReady)
              return;
          if (this._direction === 'send') {
              const offer = await this._pc.createOffer({ iceRestart: true });
              logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
          }
          else {
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
          }
      }
      async getTransportStats() {
          return this._pc.getStats();
      }
      async send({ track, encodings, codecOptions, codec }) {
          this._assertSendDirection();
          logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
          if (encodings) {
              encodings = utils.clone(encodings, []);
              if (encodings.length > 1) {
                  encodings.forEach((encoding, idx) => {
                      encoding.rid = `r${idx}`;
                  });
                  // Clone the encodings and reverse them because Firefox likes them
                  // from high to low.
                  encodings.reverse();
              }
          }
          const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
          // This may throw.
          sendingRtpParameters.codecs =
              ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
          const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
          // This may throw.
          sendingRemoteRtpParameters.codecs =
              ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
          // NOTE: Firefox fails sometimes to properly anticipate the closed media
          // section that it should use, so don't reuse closed media sections.
          //   https://github.com/versatica/mediasoup-client/issues/104
          //
          // const mediaSectionIdx = this._remoteSdp!.getNextMediaSectionIdx();
          const transceiver = this._pc.addTransceiver(track, { direction: 'sendonly', streams: [this._sendStream] });
          // NOTE: This is not spec compliants. Encodings should be given in addTransceiver
          // second argument, but Firefox does not support it.
          if (encodings) {
              const parameters = transceiver.sender.getParameters();
              parameters.encodings = encodings;
              await transceiver.sender.setParameters(parameters);
          }
          const offer = await this._pc.createOffer();
          let localSdpObject = sdpTransform.parse(offer.sdp);
          // In Firefox use DTLS role client even if we are the "offerer" since
          // Firefox does not respect ICE-Lite.
          if (!this._transportReady)
              await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
          logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          // We can now get the transceiver.mid.
          const localId = transceiver.mid;
          // Set MID.
          sendingRtpParameters.mid = localId;
          localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          const offerMediaObject = localSdpObject.media[localSdpObject.media.length - 1];
          // Set RTCP CNAME.
          sendingRtpParameters.rtcp.cname =
              sdpCommonUtils.getCname({ offerMediaObject });
          // Set RTP encodings by parsing the SDP offer if no encodings are given.
          if (!encodings) {
              sendingRtpParameters.encodings =
                  sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
          }
          // Set RTP encodings by parsing the SDP offer and complete them with given
          // one if just a single encoding has been given.
          else if (encodings.length === 1) {
              const newEncodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
              Object.assign(newEncodings[0], encodings[0]);
              sendingRtpParameters.encodings = newEncodings;
          }
          // Otherwise if more than 1 encoding are given use them verbatim (but
          // reverse them back since we reversed them above to satisfy Firefox).
          else {
              sendingRtpParameters.encodings = encodings.reverse();
          }
          // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
          // each encoding.
          if (sendingRtpParameters.encodings.length > 1 &&
              (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
                  sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
              for (const encoding of sendingRtpParameters.encodings) {
                  encoding.scalabilityMode = 'S1T3';
              }
          }
          this._remoteSdp.send({
              offerMediaObject,
              offerRtpParameters: sendingRtpParameters,
              answerRtpParameters: sendingRemoteRtpParameters,
              codecOptions,
              extmapAllowMixed: true
          });
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          // Store in the map.
          this._mapMidTransceiver.set(localId, transceiver);
          return {
              localId,
              rtpParameters: sendingRtpParameters,
              rtpSender: transceiver.sender
          };
      }
      async stopSending(localId) {
          logger.debug('stopSending() [localId:%s]', localId);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated transceiver not found');
          transceiver.sender.replaceTrack(null);
          this._pc.removeTrack(transceiver.sender);
          // NOTE: Cannot use closeMediaSection() due to the the note above in send()
          // method.
          // this._remoteSdp!.closeMediaSection(transceiver.mid);
          this._remoteSdp.disableMediaSection(transceiver.mid);
          const offer = await this._pc.createOffer();
          logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          this._mapMidTransceiver.delete(localId);
      }
      async replaceTrack(localId, track) {
          this._assertSendDirection();
          if (track) {
              logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
          }
          else {
              logger.debug('replaceTrack() [localId:%s, no track]', localId);
          }
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          await transceiver.sender.replaceTrack(track);
      }
      async setMaxSpatialLayer(localId, spatialLayer) {
          this._assertSendDirection();
          logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated transceiver not found');
          const parameters = transceiver.sender.getParameters();
          // NOTE: We require encodings given from low to high, however Firefox
          // requires them in reverse order, so do magic here.
          spatialLayer = parameters.encodings.length - 1 - spatialLayer;
          parameters.encodings.forEach((encoding, idx) => {
              if (idx >= spatialLayer)
                  encoding.active = true;
              else
                  encoding.active = false;
          });
          await transceiver.sender.setParameters(parameters);
      }
      async setRtpEncodingParameters(localId, params) {
          this._assertSendDirection();
          logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          const parameters = transceiver.sender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              parameters.encodings[idx] = { ...encoding, ...params };
          });
          await transceiver.sender.setParameters(parameters);
      }
      async getSenderStats(localId) {
          this._assertSendDirection();
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          return transceiver.sender.getStats();
      }
      async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
          this._assertSendDirection();
          const options = {
              negotiated: true,
              id: this._nextSendSctpStreamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('sendDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // Increase next id.
          this._nextSendSctpStreamId =
              ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
          // If this is the first DataChannel we need to create the SDP answer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              const offer = await this._pc.createOffer();
              const localSdpObject = sdpTransform.parse(offer.sdp);
              const offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'application');
              if (!this._transportReady)
                  await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
              logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              this._remoteSdp.sendSctpAssociation({ offerMediaObject });
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          const sctpStreamParameters = {
              streamId: options.id,
              ordered: options.ordered,
              maxPacketLifeTime: options.maxPacketLifeTime,
              maxRetransmits: options.maxRetransmits
          };
          return { dataChannel, sctpStreamParameters };
      }
      async receive(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      optionsList) {
          this._assertRecvDirection();
          const results = [];
          const mapLocalId = new Map();
          for (const options of optionsList) {
              const { trackId, kind, rtpParameters } = options;
              logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
              const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
              mapLocalId.set(trackId, localId);
              this._remoteSdp.receive({
                  mid: localId,
                  kind,
                  offerRtpParameters: rtpParameters,
                  streamId: rtpParameters.rtcp.cname,
                  trackId
              });
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          let answer = await this._pc.createAnswer();
          const localSdpObject = sdpTransform.parse(answer.sdp);
          for (const options of optionsList) {
              const { trackId, rtpParameters } = options;
              const localId = mapLocalId.get(trackId);
              const answerMediaObject = localSdpObject.media
                  .find((m) => String(m.mid) === localId);
              // May need to modify codec parameters in the answer based on codec
              // parameters in the offer.
              sdpCommonUtils.applyCodecParameters({
                  offerRtpParameters: rtpParameters,
                  answerMediaObject
              });
              answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
          }
          if (!this._transportReady)
              await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
          logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          for (const options of optionsList) {
              const { trackId } = options;
              const localId = mapLocalId.get(trackId);
              const transceiver = this._pc.getTransceivers()
                  .find((t) => t.mid === localId);
              if (!transceiver)
                  throw new Error('new RTCRtpTransceiver not found');
              // Store in the map.
              this._mapMidTransceiver.set(localId, transceiver);
              results.push({
                  localId,
                  track: transceiver.receiver.track,
                  rtpReceiver: transceiver.receiver
              });
          }
          return results;
      }
      async stopReceiving(localId) {
          this._assertRecvDirection();
          logger.debug('stopReceiving() [localId:%s]', localId);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          this._remoteSdp.closeMediaSection(transceiver.mid);
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          this._mapMidTransceiver.delete(localId);
      }
      async pauseReceiving(localIds) {
          this._assertRecvDirection();
          for (const localId of localIds) {
              logger.debug('pauseReceiving() [localId:%s]', localId);
              const transceiver = this._mapMidTransceiver.get(localId);
              if (!transceiver)
                  throw new Error('associated RTCRtpTransceiver not found');
              transceiver.direction = 'inactive';
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('pauseReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('pauseReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async resumeReceiving(localIds) {
          this._assertRecvDirection();
          for (const localId of localIds) {
              logger.debug('resumeReceiving() [localId:%s]', localId);
              const transceiver = this._mapMidTransceiver.get(localId);
              if (!transceiver)
                  throw new Error('associated RTCRtpTransceiver not found');
              transceiver.direction = 'recvonly';
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('resumeReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('resumeReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async getReceiverStats(localId) {
          this._assertRecvDirection();
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          return transceiver.receiver.getStats();
      }
      async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
          this._assertRecvDirection();
          const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
          const options = {
              negotiated: true,
              id: streamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('receiveDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // If this is the first DataChannel we need to create the SDP offer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              this._remoteSdp.receiveSctpAssociation();
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              if (!this._transportReady) {
                  const localSdpObject = sdpTransform.parse(answer.sdp);
                  await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
              }
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          return { dataChannel };
      }
      async _setupTransport({ localDtlsRole, localSdpObject }) {
          if (!localSdpObject)
              localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          // Get our local DTLS parameters.
          const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
          // Set our DTLS role.
          dtlsParameters.role = localDtlsRole;
          // Update the remote DTLS role in the SDP.
          this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
          // Need to tell the remote transport about our parameters.
          await new Promise((resolve, reject) => {
              this.safeEmit('@connect', { dtlsParameters }, resolve, reject);
          });
          this._transportReady = true;
      }
      _assertSendDirection() {
          if (this._direction !== 'send') {
              throw new Error('method can just be called for handlers with "send" direction');
          }
      }
      _assertRecvDirection() {
          if (this._direction !== 'recv') {
              throw new Error('method can just be called for handlers with "recv" direction');
          }
      }
  }
  exports.Firefox60 = Firefox60;
  
  },{"../Logger":44,"../errors":49,"../ortc":67,"../utils":70,"./HandlerInterface":56,"./sdp/RemoteSdp":62,"./sdp/commonUtils":63,"./sdp/unifiedPlanUtils":65,"sdp-transform":79}],56:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.HandlerInterface = void 0;
  const EnhancedEventEmitter_1 = require("../EnhancedEventEmitter");
  class HandlerInterface extends EnhancedEventEmitter_1.EnhancedEventEmitter {
      constructor() {
          super();
      }
  }
  exports.HandlerInterface = HandlerInterface;
  
  },{"../EnhancedEventEmitter":43}],57:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.ReactNative = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  const Logger_1 = require("../Logger");
  const errors_1 = require("../errors");
  const utils = __importStar(require("../utils"));
  const ortc = __importStar(require("../ortc"));
  const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
  const sdpPlanBUtils = __importStar(require("./sdp/planBUtils"));
  const HandlerInterface_1 = require("./HandlerInterface");
  const RemoteSdp_1 = require("./sdp/RemoteSdp");
  const logger = new Logger_1.Logger('ReactNative');
  const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
  class ReactNative extends HandlerInterface_1.HandlerInterface {
      constructor() {
          super();
          // Local stream for sending.
          this._sendStream = new MediaStream();
          // Map of sending MediaStreamTracks indexed by localId.
          this._mapSendLocalIdTrack = new Map();
          // Next sending localId.
          this._nextSendLocalId = 0;
          // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
          // Value is an Object with mid, rtpParameters and rtpReceiver.
          this._mapRecvLocalIdInfo = new Map();
          // Whether a DataChannel m=application section has been created.
          this._hasDataChannelMediaSection = false;
          // Sending DataChannel id value counter. Incremented for each new DataChannel.
          this._nextSendSctpStreamId = 0;
          // Got transport local and remote parameters.
          this._transportReady = false;
      }
      /**
       * Creates a factory function.
       */
      static createFactory() {
          return () => new ReactNative();
      }
      get name() {
          return 'ReactNative';
      }
      close() {
          logger.debug('close()');
          // Free/dispose native MediaStream but DO NOT free/dispose native
          // MediaStreamTracks (that is parent's business).
          // @ts-ignore (proprietary API in react-native-webrtc).
          this._sendStream.release(/* releaseTracks */ false);
          // Close RTCPeerConnection.
          if (this._pc) {
              try {
                  this._pc.close();
              }
              catch (error) { }
          }
      }
      async getNativeRtpCapabilities() {
          logger.debug('getNativeRtpCapabilities()');
          const pc = new RTCPeerConnection({
              iceServers: [],
              iceTransportPolicy: 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'plan-b'
          });
          try {
              const offer = await pc.createOffer({
                  offerToReceiveAudio: true,
                  offerToReceiveVideo: true
              });
              try {
                  pc.close();
              }
              catch (error) { }
              const sdpObject = sdpTransform.parse(offer.sdp);
              const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
              return nativeRtpCapabilities;
          }
          catch (error) {
              try {
                  pc.close();
              }
              catch (error2) { }
              throw error;
          }
      }
      async getNativeSctpCapabilities() {
          logger.debug('getNativeSctpCapabilities()');
          return {
              numStreams: SCTP_NUM_STREAMS
          };
      }
      run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
          logger.debug('run()');
          this._direction = direction;
          this._remoteSdp = new RemoteSdp_1.RemoteSdp({
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters,
              planB: true
          });
          this._sendingRtpParametersByKind =
              {
                  audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
              };
          this._sendingRemoteRtpParametersByKind =
              {
                  audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
              };
          if (dtlsParameters.role && dtlsParameters.role !== 'auto') {
              this._forcedLocalDtlsRole = dtlsParameters.role === 'server'
                  ? 'client'
                  : 'server';
          }
          this._pc = new RTCPeerConnection({
              iceServers: iceServers || [],
              iceTransportPolicy: iceTransportPolicy || 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'plan-b',
              ...additionalSettings
          }, proprietaryConstraints);
          // Handle RTCPeerConnection connection status.
          this._pc.addEventListener('iceconnectionstatechange', () => {
              switch (this._pc.iceConnectionState) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
      }
      async updateIceServers(iceServers) {
          logger.debug('updateIceServers()');
          const configuration = this._pc.getConfiguration();
          configuration.iceServers = iceServers;
          this._pc.setConfiguration(configuration);
      }
      async restartIce(iceParameters) {
          logger.debug('restartIce()');
          // Provide the remote SDP handler with new remote ICE parameters.
          this._remoteSdp.updateIceParameters(iceParameters);
          if (!this._transportReady)
              return;
          if (this._direction === 'send') {
              const offer = await this._pc.createOffer({ iceRestart: true });
              logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
          }
          else {
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
          }
      }
      async getTransportStats() {
          return this._pc.getStats();
      }
      async send({ track, encodings, codecOptions, codec }) {
          var _a;
          this._assertSendDirection();
          logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
          if (codec) {
              logger.warn('send() | codec selection is not available in %s handler', this.name);
          }
          this._sendStream.addTrack(track);
          this._pc.addStream(this._sendStream);
          let offer = await this._pc.createOffer();
          let localSdpObject = sdpTransform.parse(offer.sdp);
          let offerMediaObject;
          const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
          sendingRtpParameters.codecs =
              ortc.reduceCodecs(sendingRtpParameters.codecs);
          const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
          sendingRemoteRtpParameters.codecs =
              ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          if (track.kind === 'video' && encodings && encodings.length > 1) {
              logger.debug('send() | enabling simulcast');
              localSdpObject = sdpTransform.parse(offer.sdp);
              offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'video');
              sdpPlanBUtils.addLegacySimulcast({
                  offerMediaObject,
                  track,
                  numStreams: encodings.length
              });
              offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
          }
          logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          offerMediaObject = localSdpObject.media
              .find((m) => m.type === track.kind);
          // Set RTCP CNAME.
          sendingRtpParameters.rtcp.cname =
              sdpCommonUtils.getCname({ offerMediaObject });
          // Set RTP encodings.
          sendingRtpParameters.encodings =
              sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
          // Complete encodings with given values.
          if (encodings) {
              for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
                  if (encodings[idx])
                      Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
              }
          }
          // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
          // each encoding.
          if (sendingRtpParameters.encodings.length > 1 &&
              (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
                  sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
              for (const encoding of sendingRtpParameters.encodings) {
                  encoding.scalabilityMode = 'S1T3';
              }
          }
          this._remoteSdp.send({
              offerMediaObject,
              offerRtpParameters: sendingRtpParameters,
              answerRtpParameters: sendingRemoteRtpParameters,
              codecOptions
          });
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          const localId = String(this._nextSendLocalId);
          this._nextSendLocalId++;
          // Insert into the map.
          this._mapSendLocalIdTrack.set(localId, track);
          return {
              localId: localId,
              rtpParameters: sendingRtpParameters
          };
      }
      async stopSending(localId) {
          this._assertSendDirection();
          logger.debug('stopSending() [localId:%s]', localId);
          const track = this._mapSendLocalIdTrack.get(localId);
          if (!track)
              throw new Error('track not found');
          this._mapSendLocalIdTrack.delete(localId);
          this._sendStream.removeTrack(track);
          this._pc.addStream(this._sendStream);
          const offer = await this._pc.createOffer();
          logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
          try {
              await this._pc.setLocalDescription(offer);
          }
          catch (error) {
              // NOTE: If there are no sending tracks, setLocalDescription() will fail with
              // "Failed to create channels". If so, ignore it.
              if (this._sendStream.getTracks().length === 0) {
                  logger.warn('stopSending() | ignoring expected error due no sending tracks: %s', error.toString());
                  return;
              }
              throw error;
          }
          if (this._pc.signalingState === 'stable')
              return;
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
      }
      async replaceTrack(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localId, track) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async setMaxSpatialLayer(localId, spatialLayer) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async setRtpEncodingParameters(localId, params) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async getSenderStats(localId) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
          var _a;
          this._assertSendDirection();
          const options = {
              negotiated: true,
              id: this._nextSendSctpStreamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmitTime: maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('sendDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // Increase next id.
          this._nextSendSctpStreamId =
              ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
          // If this is the first DataChannel we need to create the SDP answer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              const offer = await this._pc.createOffer();
              const localSdpObject = sdpTransform.parse(offer.sdp);
              const offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'application');
              if (!this._transportReady) {
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              this._remoteSdp.sendSctpAssociation({ offerMediaObject });
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          const sctpStreamParameters = {
              streamId: options.id,
              ordered: options.ordered,
              maxPacketLifeTime: options.maxPacketLifeTime,
              maxRetransmits: options.maxRetransmits
          };
          return { dataChannel, sctpStreamParameters };
      }
      async receive(optionsList) {
          var _a;
          this._assertRecvDirection();
          const results = [];
          const mapStreamId = new Map();
          for (const options of optionsList) {
              const { trackId, kind, rtpParameters } = options;
              logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
              const mid = kind;
              let streamId = rtpParameters.rtcp.cname;
              // NOTE: In React-Native we cannot reuse the same remote MediaStream for new
              // remote tracks. This is because react-native-webrtc does not react on new
              // tracks generated within already existing streams, so force the streamId
              // to be different.
              logger.debug('receive() | forcing a random remote streamId to avoid well known bug in react-native-webrtc');
              streamId += `-hack-${utils.generateRandomNumber()}`;
              mapStreamId.set(trackId, streamId);
              this._remoteSdp.receive({
                  mid,
                  kind,
                  offerRtpParameters: rtpParameters,
                  streamId,
                  trackId
              });
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          let answer = await this._pc.createAnswer();
          const localSdpObject = sdpTransform.parse(answer.sdp);
          for (const options of optionsList) {
              const { kind, rtpParameters } = options;
              const mid = kind;
              const answerMediaObject = localSdpObject.media
                  .find((m) => String(m.mid) === mid);
              // May need to modify codec parameters in the answer based on codec
              // parameters in the offer.
              sdpCommonUtils.applyCodecParameters({
                  offerRtpParameters: rtpParameters,
                  answerMediaObject
              });
          }
          answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          for (const options of optionsList) {
              const { kind, trackId, rtpParameters } = options;
              const localId = trackId;
              const mid = kind;
              const streamId = mapStreamId.get(trackId);
              const stream = this._pc.getRemoteStreams()
                  .find((s) => s.id === streamId);
              const track = stream.getTrackById(localId);
              if (!track)
                  throw new Error('remote track not found');
              // Insert into the map.
              this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters });
              results.push({ localId, track });
          }
          return results;
      }
      async stopReceiving(localId) {
          this._assertRecvDirection();
          logger.debug('stopReceiving() [localId:%s]', localId);
          const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
          // Remove from the map.
          this._mapRecvLocalIdInfo.delete(localId);
          this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async pauseReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async resumeReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      async getReceiverStats(localId) {
          throw new errors_1.UnsupportedError('not implemented');
      }
      async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
          var _a;
          this._assertRecvDirection();
          const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
          const options = {
              negotiated: true,
              id: streamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmitTime: maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('receiveDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // If this is the first DataChannel we need to create the SDP offer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              if (!this._transportReady) {
                  const localSdpObject = sdpTransform.parse(answer.sdp);
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          return { dataChannel };
      }
      async _setupTransport({ localDtlsRole, localSdpObject }) {
          if (!localSdpObject)
              localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          // Get our local DTLS parameters.
          const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
          // Set our DTLS role.
          dtlsParameters.role = localDtlsRole;
          // Update the remote DTLS role in the SDP.
          this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
          // Need to tell the remote transport about our parameters.
          await new Promise((resolve, reject) => {
              this.safeEmit('@connect', { dtlsParameters }, resolve, reject);
          });
          this._transportReady = true;
      }
      _assertSendDirection() {
          if (this._direction !== 'send') {
              throw new Error('method can just be called for handlers with "send" direction');
          }
      }
      _assertRecvDirection() {
          if (this._direction !== 'recv') {
              throw new Error('method can just be called for handlers with "recv" direction');
          }
      }
  }
  exports.ReactNative = ReactNative;
  
  },{"../Logger":44,"../errors":49,"../ortc":67,"../utils":70,"./HandlerInterface":56,"./sdp/RemoteSdp":62,"./sdp/commonUtils":63,"./sdp/planBUtils":64,"sdp-transform":79}],58:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Safari11 = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  const Logger_1 = require("../Logger");
  const utils = __importStar(require("../utils"));
  const ortc = __importStar(require("../ortc"));
  const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
  const sdpPlanBUtils = __importStar(require("./sdp/planBUtils"));
  const HandlerInterface_1 = require("./HandlerInterface");
  const RemoteSdp_1 = require("./sdp/RemoteSdp");
  const logger = new Logger_1.Logger('Safari11');
  const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
  class Safari11 extends HandlerInterface_1.HandlerInterface {
      constructor() {
          super();
          // Local stream for sending.
          this._sendStream = new MediaStream();
          // Map of RTCRtpSender indexed by localId.
          this._mapSendLocalIdRtpSender = new Map();
          // Next sending localId.
          this._nextSendLocalId = 0;
          // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
          // Value is an Object with mid, rtpParameters and rtpReceiver.
          this._mapRecvLocalIdInfo = new Map();
          // Whether a DataChannel m=application section has been created.
          this._hasDataChannelMediaSection = false;
          // Sending DataChannel id value counter. Incremented for each new DataChannel.
          this._nextSendSctpStreamId = 0;
          // Got transport local and remote parameters.
          this._transportReady = false;
      }
      /**
       * Creates a factory function.
       */
      static createFactory() {
          return () => new Safari11();
      }
      get name() {
          return 'Safari11';
      }
      close() {
          logger.debug('close()');
          // Close RTCPeerConnection.
          if (this._pc) {
              try {
                  this._pc.close();
              }
              catch (error) { }
          }
      }
      async getNativeRtpCapabilities() {
          logger.debug('getNativeRtpCapabilities()');
          const pc = new RTCPeerConnection({
              iceServers: [],
              iceTransportPolicy: 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              sdpSemantics: 'plan-b'
          });
          try {
              const offer = await pc.createOffer({
                  offerToReceiveAudio: true,
                  offerToReceiveVideo: true
              });
              try {
                  pc.close();
              }
              catch (error) { }
              const sdpObject = sdpTransform.parse(offer.sdp);
              const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
              return nativeRtpCapabilities;
          }
          catch (error) {
              try {
                  pc.close();
              }
              catch (error2) { }
              throw error;
          }
      }
      async getNativeSctpCapabilities() {
          logger.debug('getNativeSctpCapabilities()');
          return {
              numStreams: SCTP_NUM_STREAMS
          };
      }
      run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
          logger.debug('run()');
          this._direction = direction;
          this._remoteSdp = new RemoteSdp_1.RemoteSdp({
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters,
              planB: true
          });
          this._sendingRtpParametersByKind =
              {
                  audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
              };
          this._sendingRemoteRtpParametersByKind =
              {
                  audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
              };
          if (dtlsParameters.role && dtlsParameters.role !== 'auto') {
              this._forcedLocalDtlsRole = dtlsParameters.role === 'server'
                  ? 'client'
                  : 'server';
          }
          this._pc = new RTCPeerConnection({
              iceServers: iceServers || [],
              iceTransportPolicy: iceTransportPolicy || 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              ...additionalSettings
          }, proprietaryConstraints);
          // Handle RTCPeerConnection connection status.
          this._pc.addEventListener('iceconnectionstatechange', () => {
              switch (this._pc.iceConnectionState) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
      }
      async updateIceServers(iceServers) {
          logger.debug('updateIceServers()');
          const configuration = this._pc.getConfiguration();
          configuration.iceServers = iceServers;
          this._pc.setConfiguration(configuration);
      }
      async restartIce(iceParameters) {
          logger.debug('restartIce()');
          // Provide the remote SDP handler with new remote ICE parameters.
          this._remoteSdp.updateIceParameters(iceParameters);
          if (!this._transportReady)
              return;
          if (this._direction === 'send') {
              const offer = await this._pc.createOffer({ iceRestart: true });
              logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
          }
          else {
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
          }
      }
      async getTransportStats() {
          return this._pc.getStats();
      }
      async send({ track, encodings, codecOptions, codec }) {
          var _a;
          this._assertSendDirection();
          logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
          if (codec) {
              logger.warn('send() | codec selection is not available in %s handler', this.name);
          }
          this._sendStream.addTrack(track);
          this._pc.addTrack(track, this._sendStream);
          let offer = await this._pc.createOffer();
          let localSdpObject = sdpTransform.parse(offer.sdp);
          let offerMediaObject;
          const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
          sendingRtpParameters.codecs =
              ortc.reduceCodecs(sendingRtpParameters.codecs);
          const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
          sendingRemoteRtpParameters.codecs =
              ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          if (track.kind === 'video' && encodings && encodings.length > 1) {
              logger.debug('send() | enabling simulcast');
              localSdpObject = sdpTransform.parse(offer.sdp);
              offerMediaObject = localSdpObject.media.find((m) => m.type === 'video');
              sdpPlanBUtils.addLegacySimulcast({
                  offerMediaObject,
                  track,
                  numStreams: encodings.length
              });
              offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
          }
          logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          offerMediaObject = localSdpObject.media
              .find((m) => m.type === track.kind);
          // Set RTCP CNAME.
          sendingRtpParameters.rtcp.cname =
              sdpCommonUtils.getCname({ offerMediaObject });
          // Set RTP encodings.
          sendingRtpParameters.encodings =
              sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
          // Complete encodings with given values.
          if (encodings) {
              for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
                  if (encodings[idx])
                      Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
              }
          }
          // If VP8 and there is effective simulcast, add scalabilityMode to each
          // encoding.
          if (sendingRtpParameters.encodings.length > 1 &&
              sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8') {
              for (const encoding of sendingRtpParameters.encodings) {
                  encoding.scalabilityMode = 'S1T3';
              }
          }
          this._remoteSdp.send({
              offerMediaObject,
              offerRtpParameters: sendingRtpParameters,
              answerRtpParameters: sendingRemoteRtpParameters,
              codecOptions
          });
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          const localId = String(this._nextSendLocalId);
          this._nextSendLocalId++;
          const rtpSender = this._pc.getSenders()
              .find((s) => s.track === track);
          // Insert into the map.
          this._mapSendLocalIdRtpSender.set(localId, rtpSender);
          return {
              localId: localId,
              rtpParameters: sendingRtpParameters,
              rtpSender
          };
      }
      async stopSending(localId) {
          this._assertSendDirection();
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          if (rtpSender.track)
              this._sendStream.removeTrack(rtpSender.track);
          this._mapSendLocalIdRtpSender.delete(localId);
          const offer = await this._pc.createOffer();
          logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
          try {
              await this._pc.setLocalDescription(offer);
          }
          catch (error) {
              // NOTE: If there are no sending tracks, setLocalDescription() will fail with
              // "Failed to create channels". If so, ignore it.
              if (this._sendStream.getTracks().length === 0) {
                  logger.warn('stopSending() | ignoring expected error due no sending tracks: %s', error.toString());
                  return;
              }
              throw error;
          }
          if (this._pc.signalingState === 'stable')
              return;
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
      }
      async replaceTrack(localId, track) {
          this._assertSendDirection();
          if (track) {
              logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
          }
          else {
              logger.debug('replaceTrack() [localId:%s, no track]', localId);
          }
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          const oldTrack = rtpSender.track;
          await rtpSender.replaceTrack(track);
          // Remove the old track from the local stream.
          if (oldTrack)
              this._sendStream.removeTrack(oldTrack);
          // Add the new track to the local stream.
          if (track)
              this._sendStream.addTrack(track);
      }
      async setMaxSpatialLayer(localId, spatialLayer) {
          this._assertSendDirection();
          logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          const parameters = rtpSender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              if (idx <= spatialLayer)
                  encoding.active = true;
              else
                  encoding.active = false;
          });
          await rtpSender.setParameters(parameters);
      }
      async setRtpEncodingParameters(localId, params) {
          this._assertSendDirection();
          logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          const parameters = rtpSender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              parameters.encodings[idx] = { ...encoding, ...params };
          });
          await rtpSender.setParameters(parameters);
      }
      async getSenderStats(localId) {
          this._assertSendDirection();
          const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
          if (!rtpSender)
              throw new Error('associated RTCRtpSender not found');
          return rtpSender.getStats();
      }
      async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
          var _a;
          this._assertSendDirection();
          const options = {
              negotiated: true,
              id: this._nextSendSctpStreamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('sendDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // Increase next id.
          this._nextSendSctpStreamId =
              ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
          // If this is the first DataChannel we need to create the SDP answer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              const offer = await this._pc.createOffer();
              const localSdpObject = sdpTransform.parse(offer.sdp);
              const offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'application');
              if (!this._transportReady) {
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              this._remoteSdp.sendSctpAssociation({ offerMediaObject });
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          const sctpStreamParameters = {
              streamId: options.id,
              ordered: options.ordered,
              maxPacketLifeTime: options.maxPacketLifeTime,
              maxRetransmits: options.maxRetransmits
          };
          return { dataChannel, sctpStreamParameters };
      }
      async receive(optionsList) {
          var _a;
          this._assertRecvDirection();
          const results = [];
          for (const options of optionsList) {
              const { trackId, kind, rtpParameters } = options;
              logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
              const mid = kind;
              this._remoteSdp.receive({
                  mid,
                  kind,
                  offerRtpParameters: rtpParameters,
                  streamId: rtpParameters.rtcp.cname,
                  trackId
              });
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          let answer = await this._pc.createAnswer();
          const localSdpObject = sdpTransform.parse(answer.sdp);
          for (const options of optionsList) {
              const { kind, rtpParameters } = options;
              const mid = kind;
              const answerMediaObject = localSdpObject.media
                  .find((m) => String(m.mid) === mid);
              // May need to modify codec parameters in the answer based on codec
              // parameters in the offer.
              sdpCommonUtils.applyCodecParameters({
                  offerRtpParameters: rtpParameters,
                  answerMediaObject
              });
          }
          answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          for (const options of optionsList) {
              const { kind, trackId, rtpParameters } = options;
              const mid = kind;
              const localId = trackId;
              const rtpReceiver = this._pc.getReceivers()
                  .find((r) => r.track && r.track.id === localId);
              if (!rtpReceiver)
                  throw new Error('new RTCRtpReceiver not');
              // Insert into the map.
              this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters, rtpReceiver });
              results.push({
                  localId,
                  track: rtpReceiver.track,
                  rtpReceiver
              });
          }
          return results;
      }
      async stopReceiving(localId) {
          this._assertRecvDirection();
          logger.debug('stopReceiving() [localId:%s]', localId);
          const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
          // Remove from the map.
          this._mapRecvLocalIdInfo.delete(localId);
          this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async getReceiverStats(localId) {
          this._assertRecvDirection();
          const { rtpReceiver } = this._mapRecvLocalIdInfo.get(localId) || {};
          if (!rtpReceiver)
              throw new Error('associated RTCRtpReceiver not found');
          return rtpReceiver.getStats();
      }
      async pauseReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async resumeReceiving(
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      localIds) {
          // Unimplemented.
      }
      async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
          var _a;
          this._assertRecvDirection();
          const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
          const options = {
              negotiated: true,
              id: streamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('receiveDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // If this is the first DataChannel we need to create the SDP offer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              if (!this._transportReady) {
                  const localSdpObject = sdpTransform.parse(answer.sdp);
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          return { dataChannel };
      }
      async _setupTransport({ localDtlsRole, localSdpObject }) {
          if (!localSdpObject)
              localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          // Get our local DTLS parameters.
          const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
          // Set our DTLS role.
          dtlsParameters.role = localDtlsRole;
          // Update the remote DTLS role in the SDP.
          this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
          // Need to tell the remote transport about our parameters.
          await new Promise((resolve, reject) => {
              this.safeEmit('@connect', { dtlsParameters }, resolve, reject);
          });
          this._transportReady = true;
      }
      _assertSendDirection() {
          if (this._direction !== 'send') {
              throw new Error('method can just be called for handlers with "send" direction');
          }
      }
      _assertRecvDirection() {
          if (this._direction !== 'recv') {
              throw new Error('method can just be called for handlers with "recv" direction');
          }
      }
  }
  exports.Safari11 = Safari11;
  
  },{"../Logger":44,"../ortc":67,"../utils":70,"./HandlerInterface":56,"./sdp/RemoteSdp":62,"./sdp/commonUtils":63,"./sdp/planBUtils":64,"sdp-transform":79}],59:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.Safari12 = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  const Logger_1 = require("../Logger");
  const utils = __importStar(require("../utils"));
  const ortc = __importStar(require("../ortc"));
  const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
  const sdpUnifiedPlanUtils = __importStar(require("./sdp/unifiedPlanUtils"));
  const HandlerInterface_1 = require("./HandlerInterface");
  const RemoteSdp_1 = require("./sdp/RemoteSdp");
  const logger = new Logger_1.Logger('Safari12');
  const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
  class Safari12 extends HandlerInterface_1.HandlerInterface {
      constructor() {
          super();
          // Map of RTCTransceivers indexed by MID.
          this._mapMidTransceiver = new Map();
          // Local stream for sending.
          this._sendStream = new MediaStream();
          // Whether a DataChannel m=application section has been created.
          this._hasDataChannelMediaSection = false;
          // Sending DataChannel id value counter. Incremented for each new DataChannel.
          this._nextSendSctpStreamId = 0;
          // Got transport local and remote parameters.
          this._transportReady = false;
      }
      /**
       * Creates a factory function.
       */
      static createFactory() {
          return () => new Safari12();
      }
      get name() {
          return 'Safari12';
      }
      close() {
          logger.debug('close()');
          // Close RTCPeerConnection.
          if (this._pc) {
              try {
                  this._pc.close();
              }
              catch (error) { }
          }
      }
      async getNativeRtpCapabilities() {
          logger.debug('getNativeRtpCapabilities()');
          const pc = new RTCPeerConnection({
              iceServers: [],
              iceTransportPolicy: 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require'
          });
          try {
              pc.addTransceiver('audio');
              pc.addTransceiver('video');
              const offer = await pc.createOffer();
              try {
                  pc.close();
              }
              catch (error) { }
              const sdpObject = sdpTransform.parse(offer.sdp);
              const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
              return nativeRtpCapabilities;
          }
          catch (error) {
              try {
                  pc.close();
              }
              catch (error2) { }
              throw error;
          }
      }
      async getNativeSctpCapabilities() {
          logger.debug('getNativeSctpCapabilities()');
          return {
              numStreams: SCTP_NUM_STREAMS
          };
      }
      run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
          logger.debug('run()');
          this._direction = direction;
          this._remoteSdp = new RemoteSdp_1.RemoteSdp({
              iceParameters,
              iceCandidates,
              dtlsParameters,
              sctpParameters
          });
          this._sendingRtpParametersByKind =
              {
                  audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
              };
          this._sendingRemoteRtpParametersByKind =
              {
                  audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
                  video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
              };
          if (dtlsParameters.role && dtlsParameters.role !== 'auto') {
              this._forcedLocalDtlsRole = dtlsParameters.role === 'server'
                  ? 'client'
                  : 'server';
          }
          this._pc = new RTCPeerConnection({
              iceServers: iceServers || [],
              iceTransportPolicy: iceTransportPolicy || 'all',
              bundlePolicy: 'max-bundle',
              rtcpMuxPolicy: 'require',
              ...additionalSettings
          }, proprietaryConstraints);
          // Handle RTCPeerConnection connection status.
          this._pc.addEventListener('iceconnectionstatechange', () => {
              switch (this._pc.iceConnectionState) {
                  case 'checking':
                      this.emit('@connectionstatechange', 'connecting');
                      break;
                  case 'connected':
                  case 'completed':
                      this.emit('@connectionstatechange', 'connected');
                      break;
                  case 'failed':
                      this.emit('@connectionstatechange', 'failed');
                      break;
                  case 'disconnected':
                      this.emit('@connectionstatechange', 'disconnected');
                      break;
                  case 'closed':
                      this.emit('@connectionstatechange', 'closed');
                      break;
              }
          });
      }
      async updateIceServers(iceServers) {
          logger.debug('updateIceServers()');
          const configuration = this._pc.getConfiguration();
          configuration.iceServers = iceServers;
          this._pc.setConfiguration(configuration);
      }
      async restartIce(iceParameters) {
          logger.debug('restartIce()');
          // Provide the remote SDP handler with new remote ICE parameters.
          this._remoteSdp.updateIceParameters(iceParameters);
          if (!this._transportReady)
              return;
          if (this._direction === 'send') {
              const offer = await this._pc.createOffer({ iceRestart: true });
              logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
          }
          else {
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
          }
      }
      async getTransportStats() {
          return this._pc.getStats();
      }
      async send({ track, encodings, codecOptions, codec }) {
          var _a;
          this._assertSendDirection();
          logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
          const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
          // This may throw.
          sendingRtpParameters.codecs =
              ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
          const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
          // This may throw.
          sendingRemoteRtpParameters.codecs =
              ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
          const mediaSectionIdx = this._remoteSdp.getNextMediaSectionIdx();
          const transceiver = this._pc.addTransceiver(track, { direction: 'sendonly', streams: [this._sendStream] });
          let offer = await this._pc.createOffer();
          let localSdpObject = sdpTransform.parse(offer.sdp);
          let offerMediaObject;
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          if (encodings && encodings.length > 1) {
              logger.debug('send() | enabling legacy simulcast');
              localSdpObject = sdpTransform.parse(offer.sdp);
              offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
              sdpUnifiedPlanUtils.addLegacySimulcast({
                  offerMediaObject,
                  numStreams: encodings.length
              });
              offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
          }
          logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          // We can now get the transceiver.mid.
          const localId = transceiver.mid;
          // Set MID.
          sendingRtpParameters.mid = localId;
          localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
          // Set RTCP CNAME.
          sendingRtpParameters.rtcp.cname =
              sdpCommonUtils.getCname({ offerMediaObject });
          // Set RTP encodings.
          sendingRtpParameters.encodings =
              sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
          // Complete encodings with given values.
          if (encodings) {
              for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
                  if (encodings[idx])
                      Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
              }
          }
          // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
          // each encoding.
          if (sendingRtpParameters.encodings.length > 1 &&
              (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
                  sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
              for (const encoding of sendingRtpParameters.encodings) {
                  encoding.scalabilityMode = 'S1T3';
              }
          }
          this._remoteSdp.send({
              offerMediaObject,
              reuseMid: mediaSectionIdx.reuseMid,
              offerRtpParameters: sendingRtpParameters,
              answerRtpParameters: sendingRemoteRtpParameters,
              codecOptions
          });
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          // Store in the map.
          this._mapMidTransceiver.set(localId, transceiver);
          return {
              localId,
              rtpParameters: sendingRtpParameters,
              rtpSender: transceiver.sender
          };
      }
      async stopSending(localId) {
          this._assertSendDirection();
          logger.debug('stopSending() [localId:%s]', localId);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          transceiver.sender.replaceTrack(null);
          this._pc.removeTrack(transceiver.sender);
          this._remoteSdp.closeMediaSection(transceiver.mid);
          const offer = await this._pc.createOffer();
          logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
          await this._pc.setLocalDescription(offer);
          const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
          await this._pc.setRemoteDescription(answer);
          this._mapMidTransceiver.delete(localId);
      }
      async replaceTrack(localId, track) {
          this._assertSendDirection();
          if (track) {
              logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
          }
          else {
              logger.debug('replaceTrack() [localId:%s, no track]', localId);
          }
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          await transceiver.sender.replaceTrack(track);
      }
      async setMaxSpatialLayer(localId, spatialLayer) {
          this._assertSendDirection();
          logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          const parameters = transceiver.sender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              if (idx <= spatialLayer)
                  encoding.active = true;
              else
                  encoding.active = false;
          });
          await transceiver.sender.setParameters(parameters);
      }
      async setRtpEncodingParameters(localId, params) {
          this._assertSendDirection();
          logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          const parameters = transceiver.sender.getParameters();
          parameters.encodings.forEach((encoding, idx) => {
              parameters.encodings[idx] = { ...encoding, ...params };
          });
          await transceiver.sender.setParameters(parameters);
      }
      async getSenderStats(localId) {
          this._assertSendDirection();
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          return transceiver.sender.getStats();
      }
      async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
          var _a;
          this._assertSendDirection();
          const options = {
              negotiated: true,
              id: this._nextSendSctpStreamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('sendDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // Increase next id.
          this._nextSendSctpStreamId =
              ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
          // If this is the first DataChannel we need to create the SDP answer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              const offer = await this._pc.createOffer();
              const localSdpObject = sdpTransform.parse(offer.sdp);
              const offerMediaObject = localSdpObject.media
                  .find((m) => m.type === 'application');
              if (!this._transportReady) {
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
              await this._pc.setLocalDescription(offer);
              this._remoteSdp.sendSctpAssociation({ offerMediaObject });
              const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
              logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setRemoteDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          const sctpStreamParameters = {
              streamId: options.id,
              ordered: options.ordered,
              maxPacketLifeTime: options.maxPacketLifeTime,
              maxRetransmits: options.maxRetransmits
          };
          return { dataChannel, sctpStreamParameters };
      }
      async receive(optionsList) {
          var _a;
          this._assertRecvDirection();
          const results = [];
          const mapLocalId = new Map();
          for (const options of optionsList) {
              const { trackId, kind, rtpParameters } = options;
              logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
              const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
              mapLocalId.set(trackId, localId);
              this._remoteSdp.receive({
                  mid: localId,
                  kind,
                  offerRtpParameters: rtpParameters,
                  streamId: rtpParameters.rtcp.cname,
                  trackId
              });
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          let answer = await this._pc.createAnswer();
          const localSdpObject = sdpTransform.parse(answer.sdp);
          for (const options of optionsList) {
              const { trackId, rtpParameters } = options;
              const localId = mapLocalId.get(trackId);
              const answerMediaObject = localSdpObject.media
                  .find((m) => String(m.mid) === localId);
              // May need to modify codec parameters in the answer based on codec
              // parameters in the offer.
              sdpCommonUtils.applyCodecParameters({
                  offerRtpParameters: rtpParameters,
                  answerMediaObject
              });
          }
          answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
          if (!this._transportReady) {
              await this._setupTransport({
                  localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                  localSdpObject
              });
          }
          logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          for (const options of optionsList) {
              const { trackId } = options;
              const localId = mapLocalId.get(trackId);
              const transceiver = this._pc.getTransceivers()
                  .find((t) => t.mid === localId);
              if (!transceiver)
                  throw new Error('new RTCRtpTransceiver not found');
              // Store in the map.
              this._mapMidTransceiver.set(localId, transceiver);
              results.push({
                  localId,
                  track: transceiver.receiver.track,
                  rtpReceiver: transceiver.receiver
              });
          }
          return results;
      }
      async stopReceiving(localId) {
          this._assertRecvDirection();
          logger.debug('stopReceiving() [localId:%s]', localId);
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          this._remoteSdp.closeMediaSection(transceiver.mid);
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
          this._mapMidTransceiver.delete(localId);
      }
      async pauseReceiving(localIds) {
          this._assertRecvDirection();
          for (const localId of localIds) {
              logger.debug('pauseReceiving() [localId:%s]', localId);
              const transceiver = this._mapMidTransceiver.get(localId);
              if (!transceiver)
                  throw new Error('associated RTCRtpTransceiver not found');
              transceiver.direction = 'inactive';
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('pauseReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('pauseReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async resumeReceiving(localIds) {
          this._assertRecvDirection();
          for (const localId of localIds) {
              logger.debug('resumeReceiving() [localId:%s]', localId);
              const transceiver = this._mapMidTransceiver.get(localId);
              if (!transceiver)
                  throw new Error('associated RTCRtpTransceiver not found');
              transceiver.direction = 'recvonly';
          }
          const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
          logger.debug('resumeReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
          await this._pc.setRemoteDescription(offer);
          const answer = await this._pc.createAnswer();
          logger.debug('resumeReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
          await this._pc.setLocalDescription(answer);
      }
      async getReceiverStats(localId) {
          this._assertRecvDirection();
          const transceiver = this._mapMidTransceiver.get(localId);
          if (!transceiver)
              throw new Error('associated RTCRtpTransceiver not found');
          return transceiver.receiver.getStats();
      }
      async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
          var _a;
          this._assertRecvDirection();
          const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
          const options = {
              negotiated: true,
              id: streamId,
              ordered,
              maxPacketLifeTime,
              maxRetransmits,
              protocol
          };
          logger.debug('receiveDataChannel() [options:%o]', options);
          const dataChannel = this._pc.createDataChannel(label, options);
          // If this is the first DataChannel we need to create the SDP offer with
          // m=application section.
          if (!this._hasDataChannelMediaSection) {
              this._remoteSdp.receiveSctpAssociation();
              const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
              await this._pc.setRemoteDescription(offer);
              const answer = await this._pc.createAnswer();
              if (!this._transportReady) {
                  const localSdpObject = sdpTransform.parse(answer.sdp);
                  await this._setupTransport({
                      localDtlsRole: (_a = this._forcedLocalDtlsRole) !== null && _a !== void 0 ? _a : 'client',
                      localSdpObject
                  });
              }
              logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
              await this._pc.setLocalDescription(answer);
              this._hasDataChannelMediaSection = true;
          }
          return { dataChannel };
      }
      async _setupTransport({ localDtlsRole, localSdpObject }) {
          if (!localSdpObject)
              localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
          // Get our local DTLS parameters.
          const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
          // Set our DTLS role.
          dtlsParameters.role = localDtlsRole;
          // Update the remote DTLS role in the SDP.
          this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
          // Need to tell the remote transport about our parameters.
          await new Promise((resolve, reject) => {
              this.safeEmit('@connect', { dtlsParameters }, resolve, reject);
          });
          this._transportReady = true;
      }
      _assertSendDirection() {
          if (this._direction !== 'send') {
              throw new Error('method can just be called for handlers with "send" direction');
          }
      }
      _assertRecvDirection() {
          if (this._direction !== 'recv') {
              throw new Error('method can just be called for handlers with "recv" direction');
          }
      }
  }
  exports.Safari12 = Safari12;
  
  },{"../Logger":44,"../ortc":67,"../utils":70,"./HandlerInterface":56,"./sdp/RemoteSdp":62,"./sdp/commonUtils":63,"./sdp/unifiedPlanUtils":65,"sdp-transform":79}],60:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.mangleRtpParameters = exports.getCapabilities = void 0;
  const utils = __importStar(require("../../utils"));
  /**
   * Normalize ORTC based Edge's RTCRtpReceiver.getCapabilities() to produce a full
   * compliant ORTC RTCRtpCapabilities.
   */
  function getCapabilities() {
      const nativeCaps = RTCRtpReceiver.getCapabilities();
      const caps = utils.clone(nativeCaps, {});
      for (const codec of caps.codecs) {
          // Rename numChannels to channels.
          codec.channels = codec.numChannels;
          delete codec.numChannels;
          // Add mimeType.
          codec.mimeType = codec.mimeType || `${codec.kind}/${codec.name}`;
          // NOTE: Edge sets some numeric parameters as string rather than number. Fix them.
          if (codec.parameters) {
              const parameters = codec.parameters;
              if (parameters.apt)
                  parameters.apt = Number(parameters.apt);
              if (parameters['packetization-mode'])
                  parameters['packetization-mode'] = Number(parameters['packetization-mode']);
          }
          // Delete emty parameter String in rtcpFeedback.
          for (const feedback of codec.rtcpFeedback || []) {
              if (!feedback.parameter)
                  feedback.parameter = '';
          }
      }
      return caps;
  }
  exports.getCapabilities = getCapabilities;
  /**
   * Generate RTCRtpParameters as ORTC based Edge likes.
   */
  function mangleRtpParameters(rtpParameters) {
      const params = utils.clone(rtpParameters, {});
      // Rename mid to muxId.
      if (params.mid) {
          params.muxId = params.mid;
          delete params.mid;
      }
      for (const codec of params.codecs) {
          // Rename channels to numChannels.
          if (codec.channels) {
              codec.numChannels = codec.channels;
              delete codec.channels;
          }
          // Add codec.name (requried by Edge).
          if (codec.mimeType && !codec.name)
              codec.name = codec.mimeType.split('/')[1];
          // Remove mimeType.
          delete codec.mimeType;
      }
      return params;
  }
  exports.mangleRtpParameters = mangleRtpParameters;
  
  },{"../../utils":70}],61:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.OfferMediaSection = exports.AnswerMediaSection = exports.MediaSection = void 0;
  const utils = __importStar(require("../../utils"));
  class MediaSection {
      constructor({ iceParameters, iceCandidates, dtlsParameters, planB = false }) {
          this._mediaObject = {};
          this._planB = planB;
          if (iceParameters) {
              this.setIceParameters(iceParameters);
          }
          if (iceCandidates) {
              this._mediaObject.candidates = [];
              for (const candidate of iceCandidates) {
                  const candidateObject = {};
                  // mediasoup does mandates rtcp-mux so candidates component is always
                  // RTP (1).
                  candidateObject.component = 1;
                  candidateObject.foundation = candidate.foundation;
                  candidateObject.ip = candidate.ip;
                  candidateObject.port = candidate.port;
                  candidateObject.priority = candidate.priority;
                  candidateObject.transport = candidate.protocol;
                  candidateObject.type = candidate.type;
                  if (candidate.tcpType)
                      candidateObject.tcptype = candidate.tcpType;
                  this._mediaObject.candidates.push(candidateObject);
              }
              this._mediaObject.endOfCandidates = 'end-of-candidates';
              this._mediaObject.iceOptions = 'renomination';
          }
          if (dtlsParameters) {
              this.setDtlsRole(dtlsParameters.role);
          }
      }
      get mid() {
          return String(this._mediaObject.mid);
      }
      get closed() {
          return this._mediaObject.port === 0;
      }
      getObject() {
          return this._mediaObject;
      }
      setIceParameters(iceParameters) {
          this._mediaObject.iceUfrag = iceParameters.usernameFragment;
          this._mediaObject.icePwd = iceParameters.password;
      }
      disable() {
          this._mediaObject.direction = 'inactive';
          delete this._mediaObject.ext;
          delete this._mediaObject.ssrcs;
          delete this._mediaObject.ssrcGroups;
          delete this._mediaObject.simulcast;
          delete this._mediaObject.simulcast_03;
          delete this._mediaObject.rids;
      }
      close() {
          this._mediaObject.direction = 'inactive';
          this._mediaObject.port = 0;
          delete this._mediaObject.ext;
          delete this._mediaObject.ssrcs;
          delete this._mediaObject.ssrcGroups;
          delete this._mediaObject.simulcast;
          delete this._mediaObject.simulcast_03;
          delete this._mediaObject.rids;
          delete this._mediaObject.extmapAllowMixed;
      }
  }
  exports.MediaSection = MediaSection;
  class AnswerMediaSection extends MediaSection {
      constructor({ iceParameters, iceCandidates, dtlsParameters, sctpParameters, plainRtpParameters, planB = false, offerMediaObject, offerRtpParameters, answerRtpParameters, codecOptions, extmapAllowMixed = false }) {
          super({ iceParameters, iceCandidates, dtlsParameters, planB });
          this._mediaObject.mid = String(offerMediaObject.mid);
          this._mediaObject.type = offerMediaObject.type;
          this._mediaObject.protocol = offerMediaObject.protocol;
          if (!plainRtpParameters) {
              this._mediaObject.connection = { ip: '127.0.0.1', version: 4 };
              this._mediaObject.port = 7;
          }
          else {
              this._mediaObject.connection =
                  {
                      ip: plainRtpParameters.ip,
                      version: plainRtpParameters.ipVersion
                  };
              this._mediaObject.port = plainRtpParameters.port;
          }
          switch (offerMediaObject.type) {
              case 'audio':
              case 'video':
                  {
                      this._mediaObject.direction = 'recvonly';
                      this._mediaObject.rtp = [];
                      this._mediaObject.rtcpFb = [];
                      this._mediaObject.fmtp = [];
                      for (const codec of answerRtpParameters.codecs) {
                          const rtp = {
                              payload: codec.payloadType,
                              codec: getCodecName(codec),
                              rate: codec.clockRate
                          };
                          if (codec.channels > 1)
                              rtp.encoding = codec.channels;
                          this._mediaObject.rtp.push(rtp);
                          const codecParameters = utils.clone(codec.parameters, {});
                          if (codecOptions) {
                              const { opusStereo, opusFec, opusDtx, opusMaxPlaybackRate, opusMaxAverageBitrate, opusPtime, videoGoogleStartBitrate, videoGoogleMaxBitrate, videoGoogleMinBitrate } = codecOptions;
                              const offerCodec = offerRtpParameters.codecs
                                  .find((c) => (c.payloadType === codec.payloadType));
                              switch (codec.mimeType.toLowerCase()) {
                                  case 'audio/opus':
                                      {
                                          if (opusStereo !== undefined) {
                                              offerCodec.parameters['sprop-stereo'] = opusStereo ? 1 : 0;
                                              codecParameters.stereo = opusStereo ? 1 : 0;
                                          }
                                          if (opusFec !== undefined) {
                                              offerCodec.parameters.useinbandfec = opusFec ? 1 : 0;
                                              codecParameters.useinbandfec = opusFec ? 1 : 0;
                                          }
                                          if (opusDtx !== undefined) {
                                              offerCodec.parameters.usedtx = opusDtx ? 1 : 0;
                                              codecParameters.usedtx = opusDtx ? 1 : 0;
                                          }
                                          if (opusMaxPlaybackRate !== undefined) {
                                              codecParameters.maxplaybackrate = opusMaxPlaybackRate;
                                          }
                                          if (opusMaxAverageBitrate !== undefined) {
                                              codecParameters.maxaveragebitrate = opusMaxAverageBitrate;
                                          }
                                          if (opusPtime !== undefined) {
                                              offerCodec.parameters.ptime = opusPtime;
                                              codecParameters.ptime = opusPtime;
                                          }
                                          break;
                                      }
                                  case 'video/vp8':
                                  case 'video/vp9':
                                  case 'video/h264':
                                  case 'video/h265':
                                      {
                                          if (videoGoogleStartBitrate !== undefined)
                                              codecParameters['x-google-start-bitrate'] = videoGoogleStartBitrate;
                                          if (videoGoogleMaxBitrate !== undefined)
                                              codecParameters['x-google-max-bitrate'] = videoGoogleMaxBitrate;
                                          if (videoGoogleMinBitrate !== undefined)
                                              codecParameters['x-google-min-bitrate'] = videoGoogleMinBitrate;
                                          break;
                                      }
                              }
                          }
                          const fmtp = {
                              payload: codec.payloadType,
                              config: ''
                          };
                          for (const key of Object.keys(codecParameters)) {
                              if (fmtp.config)
                                  fmtp.config += ';';
                              fmtp.config += `${key}=${codecParameters[key]}`;
                          }
                          if (fmtp.config)
                              this._mediaObject.fmtp.push(fmtp);
                          for (const fb of codec.rtcpFeedback) {
                              this._mediaObject.rtcpFb.push({
                                  payload: codec.payloadType,
                                  type: fb.type,
                                  subtype: fb.parameter
                              });
                          }
                      }
                      this._mediaObject.payloads = answerRtpParameters.codecs
                          .map((codec) => codec.payloadType)
                          .join(' ');
                      this._mediaObject.ext = [];
                      for (const ext of answerRtpParameters.headerExtensions) {
                          // Don't add a header extension if not present in the offer.
                          const found = (offerMediaObject.ext || [])
                              .some((localExt) => localExt.uri === ext.uri);
                          if (!found)
                              continue;
                          this._mediaObject.ext.push({
                              uri: ext.uri,
                              value: ext.id
                          });
                      }
                      // Allow both 1 byte and 2 bytes length header extensions.
                      if (extmapAllowMixed &&
                          offerMediaObject.extmapAllowMixed === 'extmap-allow-mixed') {
                          this._mediaObject.extmapAllowMixed = 'extmap-allow-mixed';
                      }
                      // Simulcast.
                      if (offerMediaObject.simulcast) {
                          this._mediaObject.simulcast =
                              {
                                  dir1: 'recv',
                                  list1: offerMediaObject.simulcast.list1
                              };
                          this._mediaObject.rids = [];
                          for (const rid of offerMediaObject.rids || []) {
                              if (rid.direction !== 'send')
                                  continue;
                              this._mediaObject.rids.push({
                                  id: rid.id,
                                  direction: 'recv'
                              });
                          }
                      }
                      // Simulcast (draft version 03).
                      else if (offerMediaObject.simulcast_03) {
                          // eslint-disable-next-line camelcase
                          this._mediaObject.simulcast_03 =
                              {
                                  value: offerMediaObject.simulcast_03.value.replace(/send/g, 'recv')
                              };
                          this._mediaObject.rids = [];
                          for (const rid of offerMediaObject.rids || []) {
                              if (rid.direction !== 'send')
                                  continue;
                              this._mediaObject.rids.push({
                                  id: rid.id,
                                  direction: 'recv'
                              });
                          }
                      }
                      this._mediaObject.rtcpMux = 'rtcp-mux';
                      this._mediaObject.rtcpRsize = 'rtcp-rsize';
                      if (this._planB && this._mediaObject.type === 'video')
                          this._mediaObject.xGoogleFlag = 'conference';
                      break;
                  }
              case 'application':
                  {
                      // New spec.
                      if (typeof offerMediaObject.sctpPort === 'number') {
                          this._mediaObject.payloads = 'webrtc-datachannel';
                          this._mediaObject.sctpPort = sctpParameters.port;
                          this._mediaObject.maxMessageSize = sctpParameters.maxMessageSize;
                      }
                      // Old spec.
                      else if (offerMediaObject.sctpmap) {
                          this._mediaObject.payloads = sctpParameters.port;
                          this._mediaObject.sctpmap =
                              {
                                  app: 'webrtc-datachannel',
                                  sctpmapNumber: sctpParameters.port,
                                  maxMessageSize: sctpParameters.maxMessageSize
                              };
                      }
                      break;
                  }
          }
      }
      setDtlsRole(role) {
          switch (role) {
              case 'client':
                  this._mediaObject.setup = 'active';
                  break;
              case 'server':
                  this._mediaObject.setup = 'passive';
                  break;
              case 'auto':
                  this._mediaObject.setup = 'actpass';
                  break;
          }
      }
  }
  exports.AnswerMediaSection = AnswerMediaSection;
  class OfferMediaSection extends MediaSection {
      constructor({ iceParameters, iceCandidates, dtlsParameters, sctpParameters, plainRtpParameters, planB = false, mid, kind, offerRtpParameters, streamId, trackId, oldDataChannelSpec = false }) {
          super({ iceParameters, iceCandidates, dtlsParameters, planB });
          this._mediaObject.mid = String(mid);
          this._mediaObject.type = kind;
          if (!plainRtpParameters) {
              this._mediaObject.connection = { ip: '127.0.0.1', version: 4 };
              if (!sctpParameters)
                  this._mediaObject.protocol = 'UDP/TLS/RTP/SAVPF';
              else
                  this._mediaObject.protocol = 'UDP/DTLS/SCTP';
              this._mediaObject.port = 7;
          }
          else {
              this._mediaObject.connection =
                  {
                      ip: plainRtpParameters.ip,
                      version: plainRtpParameters.ipVersion
                  };
              this._mediaObject.protocol = 'RTP/AVP';
              this._mediaObject.port = plainRtpParameters.port;
          }
          switch (kind) {
              case 'audio':
              case 'video':
                  {
                      this._mediaObject.direction = 'sendonly';
                      this._mediaObject.rtp = [];
                      this._mediaObject.rtcpFb = [];
                      this._mediaObject.fmtp = [];
                      if (!this._planB)
                          this._mediaObject.msid = `${streamId || '-'} ${trackId}`;
                      for (const codec of offerRtpParameters.codecs) {
                          const rtp = {
                              payload: codec.payloadType,
                              codec: getCodecName(codec),
                              rate: codec.clockRate
                          };
                          if (codec.channels > 1)
                              rtp.encoding = codec.channels;
                          this._mediaObject.rtp.push(rtp);
                          const fmtp = {
                              payload: codec.payloadType,
                              config: ''
                          };
                          for (const key of Object.keys(codec.parameters)) {
                              if (fmtp.config)
                                  fmtp.config += ';';
                              fmtp.config += `${key}=${codec.parameters[key]}`;
                          }
                          if (fmtp.config)
                              this._mediaObject.fmtp.push(fmtp);
                          for (const fb of codec.rtcpFeedback) {
                              this._mediaObject.rtcpFb.push({
                                  payload: codec.payloadType,
                                  type: fb.type,
                                  subtype: fb.parameter
                              });
                          }
                      }
                      this._mediaObject.payloads = offerRtpParameters.codecs
                          .map((codec) => codec.payloadType)
                          .join(' ');
                      this._mediaObject.ext = [];
                      for (const ext of offerRtpParameters.headerExtensions) {
                          this._mediaObject.ext.push({
                              uri: ext.uri,
                              value: ext.id
                          });
                      }
                      this._mediaObject.rtcpMux = 'rtcp-mux';
                      this._mediaObject.rtcpRsize = 'rtcp-rsize';
                      const encoding = offerRtpParameters.encodings[0];
                      const ssrc = encoding.ssrc;
                      const rtxSsrc = (encoding.rtx && encoding.rtx.ssrc)
                          ? encoding.rtx.ssrc
                          : undefined;
                      this._mediaObject.ssrcs = [];
                      this._mediaObject.ssrcGroups = [];
                      if (offerRtpParameters.rtcp.cname) {
                          this._mediaObject.ssrcs.push({
                              id: ssrc,
                              attribute: 'cname',
                              value: offerRtpParameters.rtcp.cname
                          });
                      }
                      if (this._planB) {
                          this._mediaObject.ssrcs.push({
                              id: ssrc,
                              attribute: 'msid',
                              value: `${streamId || '-'} ${trackId}`
                          });
                      }
                      if (rtxSsrc) {
                          if (offerRtpParameters.rtcp.cname) {
                              this._mediaObject.ssrcs.push({
                                  id: rtxSsrc,
                                  attribute: 'cname',
                                  value: offerRtpParameters.rtcp.cname
                              });
                          }
                          if (this._planB) {
                              this._mediaObject.ssrcs.push({
                                  id: rtxSsrc,
                                  attribute: 'msid',
                                  value: `${streamId || '-'} ${trackId}`
                              });
                          }
                          // Associate original and retransmission SSRCs.
                          this._mediaObject.ssrcGroups.push({
                              semantics: 'FID',
                              ssrcs: `${ssrc} ${rtxSsrc}`
                          });
                      }
                      break;
                  }
              case 'application':
                  {
                      // New spec.
                      if (!oldDataChannelSpec) {
                          this._mediaObject.payloads = 'webrtc-datachannel';
                          this._mediaObject.sctpPort = sctpParameters.port;
                          this._mediaObject.maxMessageSize = sctpParameters.maxMessageSize;
                      }
                      // Old spec.
                      else {
                          this._mediaObject.payloads = sctpParameters.port;
                          this._mediaObject.sctpmap =
                              {
                                  app: 'webrtc-datachannel',
                                  sctpmapNumber: sctpParameters.port,
                                  maxMessageSize: sctpParameters.maxMessageSize
                              };
                      }
                      break;
                  }
          }
      }
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      setDtlsRole(role) {
          // Always 'actpass'.
          this._mediaObject.setup = 'actpass';
      }
      planBReceive({ offerRtpParameters, streamId, trackId }) {
          const encoding = offerRtpParameters.encodings[0];
          const ssrc = encoding.ssrc;
          const rtxSsrc = (encoding.rtx && encoding.rtx.ssrc)
              ? encoding.rtx.ssrc
              : undefined;
          const payloads = this._mediaObject.payloads.split(' ');
          for (const codec of offerRtpParameters.codecs) {
              if (payloads.includes(String(codec.payloadType))) {
                  continue;
              }
              const rtp = {
                  payload: codec.payloadType,
                  codec: getCodecName(codec),
                  rate: codec.clockRate
              };
              if (codec.channels > 1)
                  rtp.encoding = codec.channels;
              this._mediaObject.rtp.push(rtp);
              const fmtp = {
                  payload: codec.payloadType,
                  config: ''
              };
              for (const key of Object.keys(codec.parameters)) {
                  if (fmtp.config)
                      fmtp.config += ';';
                  fmtp.config += `${key}=${codec.parameters[key]}`;
              }
              if (fmtp.config)
                  this._mediaObject.fmtp.push(fmtp);
              for (const fb of codec.rtcpFeedback) {
                  this._mediaObject.rtcpFb.push({
                      payload: codec.payloadType,
                      type: fb.type,
                      subtype: fb.parameter
                  });
              }
          }
          this._mediaObject.payloads += ` ${offerRtpParameters
              .codecs
              .filter((codec) => !this._mediaObject.payloads.includes(codec.payloadType))
              .map((codec) => codec.payloadType)
              .join(' ')}`;
          this._mediaObject.payloads = this._mediaObject.payloads.trim();
          if (offerRtpParameters.rtcp.cname) {
              this._mediaObject.ssrcs.push({
                  id: ssrc,
                  attribute: 'cname',
                  value: offerRtpParameters.rtcp.cname
              });
          }
          this._mediaObject.ssrcs.push({
              id: ssrc,
              attribute: 'msid',
              value: `${streamId || '-'} ${trackId}`
          });
          if (rtxSsrc) {
              if (offerRtpParameters.rtcp.cname) {
                  this._mediaObject.ssrcs.push({
                      id: rtxSsrc,
                      attribute: 'cname',
                      value: offerRtpParameters.rtcp.cname
                  });
              }
              this._mediaObject.ssrcs.push({
                  id: rtxSsrc,
                  attribute: 'msid',
                  value: `${streamId || '-'} ${trackId}`
              });
              // Associate original and retransmission SSRCs.
              this._mediaObject.ssrcGroups.push({
                  semantics: 'FID',
                  ssrcs: `${ssrc} ${rtxSsrc}`
              });
          }
      }
      planBStopReceiving({ offerRtpParameters }) {
          const encoding = offerRtpParameters.encodings[0];
          const ssrc = encoding.ssrc;
          const rtxSsrc = (encoding.rtx && encoding.rtx.ssrc)
              ? encoding.rtx.ssrc
              : undefined;
          this._mediaObject.ssrcs = this._mediaObject.ssrcs
              .filter((s) => s.id !== ssrc && s.id !== rtxSsrc);
          if (rtxSsrc) {
              this._mediaObject.ssrcGroups = this._mediaObject.ssrcGroups
                  .filter((group) => group.ssrcs !== `${ssrc} ${rtxSsrc}`);
          }
      }
  }
  exports.OfferMediaSection = OfferMediaSection;
  function getCodecName(codec) {
      const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
      const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
      if (!mimeTypeMatch)
          throw new TypeError('invalid codec.mimeType');
      return mimeTypeMatch[2];
  }
  
  },{"../../utils":70}],62:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.RemoteSdp = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  const Logger_1 = require("../../Logger");
  const MediaSection_1 = require("./MediaSection");
  const logger = new Logger_1.Logger('RemoteSdp');
  class RemoteSdp {
      constructor({ iceParameters, iceCandidates, dtlsParameters, sctpParameters, plainRtpParameters, planB = false }) {
          // MediaSection instances with same order as in the SDP.
          this._mediaSections = [];
          // MediaSection indices indexed by MID.
          this._midToIndex = new Map();
          this._iceParameters = iceParameters;
          this._iceCandidates = iceCandidates;
          this._dtlsParameters = dtlsParameters;
          this._sctpParameters = sctpParameters;
          this._plainRtpParameters = plainRtpParameters;
          this._planB = planB;
          this._sdpObject =
              {
                  version: 0,
                  origin: {
                      address: '0.0.0.0',
                      ipVer: 4,
                      netType: 'IN',
                      sessionId: 10000,
                      sessionVersion: 0,
                      username: 'mediasoup-client'
                  },
                  name: '-',
                  timing: { start: 0, stop: 0 },
                  media: []
              };
          // If ICE parameters are given, add ICE-Lite indicator.
          if (iceParameters && iceParameters.iceLite) {
              this._sdpObject.icelite = 'ice-lite';
          }
          // If DTLS parameters are given, assume WebRTC and BUNDLE.
          if (dtlsParameters) {
              this._sdpObject.msidSemantic = { semantic: 'WMS', token: '*' };
              // NOTE: We take the latest fingerprint.
              const numFingerprints = this._dtlsParameters.fingerprints.length;
              this._sdpObject.fingerprint =
                  {
                      type: dtlsParameters.fingerprints[numFingerprints - 1].algorithm,
                      hash: dtlsParameters.fingerprints[numFingerprints - 1].value
                  };
              this._sdpObject.groups = [{ type: 'BUNDLE', mids: '' }];
          }
          // If there are plain RPT parameters, override SDP origin.
          if (plainRtpParameters) {
              this._sdpObject.origin.address = plainRtpParameters.ip;
              this._sdpObject.origin.ipVer = plainRtpParameters.ipVersion;
          }
      }
      updateIceParameters(iceParameters) {
          logger.debug('updateIceParameters() [iceParameters:%o]', iceParameters);
          this._iceParameters = iceParameters;
          this._sdpObject.icelite = iceParameters.iceLite ? 'ice-lite' : undefined;
          for (const mediaSection of this._mediaSections) {
              mediaSection.setIceParameters(iceParameters);
          }
      }
      updateDtlsRole(role) {
          logger.debug('updateDtlsRole() [role:%s]', role);
          this._dtlsParameters.role = role;
          for (const mediaSection of this._mediaSections) {
              mediaSection.setDtlsRole(role);
          }
      }
      getNextMediaSectionIdx() {
          // If a closed media section is found, return its index.
          for (let idx = 0; idx < this._mediaSections.length; ++idx) {
              const mediaSection = this._mediaSections[idx];
              if (mediaSection.closed)
                  return { idx, reuseMid: mediaSection.mid };
          }
          // If no closed media section is found, return next one.
          return { idx: this._mediaSections.length };
      }
      send({ offerMediaObject, reuseMid, offerRtpParameters, answerRtpParameters, codecOptions, extmapAllowMixed = false }) {
          const mediaSection = new MediaSection_1.AnswerMediaSection({
              iceParameters: this._iceParameters,
              iceCandidates: this._iceCandidates,
              dtlsParameters: this._dtlsParameters,
              plainRtpParameters: this._plainRtpParameters,
              planB: this._planB,
              offerMediaObject,
              offerRtpParameters,
              answerRtpParameters,
              codecOptions,
              extmapAllowMixed
          });
          // Unified-Plan with closed media section replacement.
          if (reuseMid) {
              this._replaceMediaSection(mediaSection, reuseMid);
          }
          // Unified-Plan or Plan-B with different media kind.
          else if (!this._midToIndex.has(mediaSection.mid)) {
              this._addMediaSection(mediaSection);
          }
          // Plan-B with same media kind.
          else {
              this._replaceMediaSection(mediaSection);
          }
      }
      receive({ mid, kind, offerRtpParameters, streamId, trackId }) {
          const idx = this._midToIndex.get(mid);
          let mediaSection;
          if (idx !== undefined)
              mediaSection = this._mediaSections[idx];
          // Unified-Plan or different media kind.
          if (!mediaSection) {
              mediaSection = new MediaSection_1.OfferMediaSection({
                  iceParameters: this._iceParameters,
                  iceCandidates: this._iceCandidates,
                  dtlsParameters: this._dtlsParameters,
                  plainRtpParameters: this._plainRtpParameters,
                  planB: this._planB,
                  mid,
                  kind,
                  offerRtpParameters,
                  streamId,
                  trackId
              });
              // Let's try to recycle a closed media section (if any).
              // NOTE: Yes, we can recycle a closed m=audio section with a new m=video.
              const oldMediaSection = this._mediaSections.find((m) => (m.closed));
              if (oldMediaSection) {
                  this._replaceMediaSection(mediaSection, oldMediaSection.mid);
              }
              else {
                  this._addMediaSection(mediaSection);
              }
          }
          // Plan-B.
          else {
              mediaSection.planBReceive({ offerRtpParameters, streamId, trackId });
              this._replaceMediaSection(mediaSection);
          }
      }
      disableMediaSection(mid) {
          const idx = this._midToIndex.get(mid);
          if (idx === undefined) {
              throw new Error(`no media section found with mid '${mid}'`);
          }
          const mediaSection = this._mediaSections[idx];
          mediaSection.disable();
      }
      closeMediaSection(mid) {
          const idx = this._midToIndex.get(mid);
          if (idx === undefined) {
              throw new Error(`no media section found with mid '${mid}'`);
          }
          const mediaSection = this._mediaSections[idx];
          // NOTE: Closing the first m section is a pain since it invalidates the
          // bundled transport, so let's avoid it.
          if (mid === this._firstMid) {
              logger.debug('closeMediaSection() | cannot close first media section, disabling it instead [mid:%s]', mid);
              this.disableMediaSection(mid);
              return;
          }
          mediaSection.close();
          // Regenerate BUNDLE mids.
          this._regenerateBundleMids();
      }
      planBStopReceiving({ mid, offerRtpParameters }) {
          const idx = this._midToIndex.get(mid);
          if (idx === undefined) {
              throw new Error(`no media section found with mid '${mid}'`);
          }
          const mediaSection = this._mediaSections[idx];
          mediaSection.planBStopReceiving({ offerRtpParameters });
          this._replaceMediaSection(mediaSection);
      }
      sendSctpAssociation({ offerMediaObject }) {
          const mediaSection = new MediaSection_1.AnswerMediaSection({
              iceParameters: this._iceParameters,
              iceCandidates: this._iceCandidates,
              dtlsParameters: this._dtlsParameters,
              sctpParameters: this._sctpParameters,
              plainRtpParameters: this._plainRtpParameters,
              offerMediaObject
          });
          this._addMediaSection(mediaSection);
      }
      receiveSctpAssociation({ oldDataChannelSpec = false } = {}) {
          const mediaSection = new MediaSection_1.OfferMediaSection({
              iceParameters: this._iceParameters,
              iceCandidates: this._iceCandidates,
              dtlsParameters: this._dtlsParameters,
              sctpParameters: this._sctpParameters,
              plainRtpParameters: this._plainRtpParameters,
              mid: 'datachannel',
              kind: 'application',
              oldDataChannelSpec
          });
          this._addMediaSection(mediaSection);
      }
      getSdp() {
          // Increase SDP version.
          this._sdpObject.origin.sessionVersion++;
          return sdpTransform.write(this._sdpObject);
      }
      _addMediaSection(newMediaSection) {
          if (!this._firstMid)
              this._firstMid = newMediaSection.mid;
          // Add to the vector.
          this._mediaSections.push(newMediaSection);
          // Add to the map.
          this._midToIndex.set(newMediaSection.mid, this._mediaSections.length - 1);
          // Add to the SDP object.
          this._sdpObject.media.push(newMediaSection.getObject());
          // Regenerate BUNDLE mids.
          this._regenerateBundleMids();
      }
      _replaceMediaSection(newMediaSection, reuseMid) {
          // Store it in the map.
          if (typeof reuseMid === 'string') {
              const idx = this._midToIndex.get(reuseMid);
              if (idx === undefined) {
                  throw new Error(`no media section found for reuseMid '${reuseMid}'`);
              }
              const oldMediaSection = this._mediaSections[idx];
              // Replace the index in the vector with the new media section.
              this._mediaSections[idx] = newMediaSection;
              // Update the map.
              this._midToIndex.delete(oldMediaSection.mid);
              this._midToIndex.set(newMediaSection.mid, idx);
              // Update the SDP object.
              this._sdpObject.media[idx] = newMediaSection.getObject();
              // Regenerate BUNDLE mids.
              this._regenerateBundleMids();
          }
          else {
              const idx = this._midToIndex.get(newMediaSection.mid);
              if (idx === undefined) {
                  throw new Error(`no media section found with mid '${newMediaSection.mid}'`);
              }
              // Replace the index in the vector with the new media section.
              this._mediaSections[idx] = newMediaSection;
              // Update the SDP object.
              this._sdpObject.media[idx] = newMediaSection.getObject();
          }
      }
      _regenerateBundleMids() {
          if (!this._dtlsParameters)
              return;
          this._sdpObject.groups[0].mids = this._mediaSections
              .filter((mediaSection) => !mediaSection.closed)
              .map((mediaSection) => mediaSection.mid)
              .join(' ');
      }
  }
  exports.RemoteSdp = RemoteSdp;
  
  },{"../../Logger":44,"./MediaSection":61,"sdp-transform":79}],63:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.applyCodecParameters = exports.getCname = exports.extractDtlsParameters = exports.extractRtpCapabilities = void 0;
  const sdpTransform = __importStar(require("sdp-transform"));
  function extractRtpCapabilities({ sdpObject }) {
      // Map of RtpCodecParameters indexed by payload type.
      const codecsMap = new Map();
      // Array of RtpHeaderExtensions.
      const headerExtensions = [];
      // Whether a m=audio/video section has been already found.
      let gotAudio = false;
      let gotVideo = false;
      for (const m of sdpObject.media) {
          const kind = m.type;
          switch (kind) {
              case 'audio':
                  {
                      if (gotAudio)
                          continue;
                      gotAudio = true;
                      break;
                  }
              case 'video':
                  {
                      if (gotVideo)
                          continue;
                      gotVideo = true;
                      break;
                  }
              default:
                  {
                      continue;
                  }
          }
          // Get codecs.
          for (const rtp of m.rtp) {
              const codec = {
                  kind: kind,
                  mimeType: `${kind}/${rtp.codec}`,
                  preferredPayloadType: rtp.payload,
                  clockRate: rtp.rate,
                  channels: rtp.encoding,
                  parameters: {},
                  rtcpFeedback: []
              };
              codecsMap.set(codec.preferredPayloadType, codec);
          }
          // Get codec parameters.
          for (const fmtp of m.fmtp || []) {
              const parameters = sdpTransform.parseParams(fmtp.config);
              const codec = codecsMap.get(fmtp.payload);
              if (!codec)
                  continue;
              // Specials case to convert parameter value to string.
              if (parameters && parameters.hasOwnProperty('profile-level-id'))
                  parameters['profile-level-id'] = String(parameters['profile-level-id']);
              codec.parameters = parameters;
          }
          // Get RTCP feedback for each codec.
          for (const fb of m.rtcpFb || []) {
              const codec = codecsMap.get(fb.payload);
              if (!codec)
                  continue;
              const feedback = {
                  type: fb.type,
                  parameter: fb.subtype
              };
              if (!feedback.parameter)
                  delete feedback.parameter;
              codec.rtcpFeedback.push(feedback);
          }
          // Get RTP header extensions.
          for (const ext of m.ext || []) {
              // Ignore encrypted extensions (not yet supported in mediasoup).
              if (ext['encrypt-uri'])
                  continue;
              const headerExtension = {
                  kind: kind,
                  uri: ext.uri,
                  preferredId: ext.value
              };
              headerExtensions.push(headerExtension);
          }
      }
      const rtpCapabilities = {
          codecs: Array.from(codecsMap.values()),
          headerExtensions: headerExtensions
      };
      return rtpCapabilities;
  }
  exports.extractRtpCapabilities = extractRtpCapabilities;
  function extractDtlsParameters({ sdpObject }) {
      const mediaObject = (sdpObject.media || [])
          .find((m) => (m.iceUfrag && m.port !== 0));
      if (!mediaObject)
          throw new Error('no active media section found');
      const fingerprint = mediaObject.fingerprint || sdpObject.fingerprint;
      let role;
      switch (mediaObject.setup) {
          case 'active':
              role = 'client';
              break;
          case 'passive':
              role = 'server';
              break;
          case 'actpass':
              role = 'auto';
              break;
      }
      const dtlsParameters = {
          role,
          fingerprints: [
              {
                  algorithm: fingerprint.type,
                  value: fingerprint.hash
              }
          ]
      };
      return dtlsParameters;
  }
  exports.extractDtlsParameters = extractDtlsParameters;
  function getCname({ offerMediaObject }) {
      const ssrcCnameLine = (offerMediaObject.ssrcs || [])
          .find((line) => line.attribute === 'cname');
      if (!ssrcCnameLine)
          return '';
      return ssrcCnameLine.value;
  }
  exports.getCname = getCname;
  /**
   * Apply codec parameters in the given SDP m= section answer based on the
   * given RTP parameters of an offer.
   */
  function applyCodecParameters({ offerRtpParameters, answerMediaObject }) {
      for (const codec of offerRtpParameters.codecs) {
          const mimeType = codec.mimeType.toLowerCase();
          // Avoid parsing codec parameters for unhandled codecs.
          if (mimeType !== 'audio/opus')
              continue;
          const rtp = (answerMediaObject.rtp || [])
              .find((r) => r.payload === codec.payloadType);
          if (!rtp)
              continue;
          // Just in case.
          answerMediaObject.fmtp = answerMediaObject.fmtp || [];
          let fmtp = answerMediaObject.fmtp
              .find((f) => f.payload === codec.payloadType);
          if (!fmtp) {
              fmtp = { payload: codec.payloadType, config: '' };
              answerMediaObject.fmtp.push(fmtp);
          }
          const parameters = sdpTransform.parseParams(fmtp.config);
          switch (mimeType) {
              case 'audio/opus':
                  {
                      const spropStereo = codec.parameters['sprop-stereo'];
                      if (spropStereo !== undefined)
                          parameters.stereo = spropStereo ? 1 : 0;
                      break;
                  }
          }
          // Write the codec fmtp.config back.
          fmtp.config = '';
          for (const key of Object.keys(parameters)) {
              if (fmtp.config)
                  fmtp.config += ';';
              fmtp.config += `${key}=${parameters[key]}`;
          }
      }
  }
  exports.applyCodecParameters = applyCodecParameters;
  
  },{"sdp-transform":79}],64:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.addLegacySimulcast = exports.getRtpEncodings = void 0;
  function getRtpEncodings({ offerMediaObject, track }) {
      // First media SSRC (or the only one).
      let firstSsrc;
      const ssrcs = new Set();
      for (const line of offerMediaObject.ssrcs || []) {
          if (line.attribute !== 'msid')
              continue;
          const trackId = line.value.split(' ')[1];
          if (trackId === track.id) {
              const ssrc = line.id;
              ssrcs.add(ssrc);
              if (!firstSsrc)
                  firstSsrc = ssrc;
          }
      }
      if (ssrcs.size === 0)
          throw new Error(`a=ssrc line with msid information not found [track.id:${track.id}]`);
      const ssrcToRtxSsrc = new Map();
      // First assume RTX is used.
      for (const line of offerMediaObject.ssrcGroups || []) {
          if (line.semantics !== 'FID')
              continue;
          let [ssrc, rtxSsrc] = line.ssrcs.split(/\s+/);
          ssrc = Number(ssrc);
          rtxSsrc = Number(rtxSsrc);
          if (ssrcs.has(ssrc)) {
              // Remove both the SSRC and RTX SSRC from the set so later we know that they
              // are already handled.
              ssrcs.delete(ssrc);
              ssrcs.delete(rtxSsrc);
              // Add to the map.
              ssrcToRtxSsrc.set(ssrc, rtxSsrc);
          }
      }
      // If the set of SSRCs is not empty it means that RTX is not being used, so take
      // media SSRCs from there.
      for (const ssrc of ssrcs) {
          // Add to the map.
          ssrcToRtxSsrc.set(ssrc, null);
      }
      const encodings = [];
      for (const [ssrc, rtxSsrc] of ssrcToRtxSsrc) {
          const encoding = { ssrc };
          if (rtxSsrc)
              encoding.rtx = { ssrc: rtxSsrc };
          encodings.push(encoding);
      }
      return encodings;
  }
  exports.getRtpEncodings = getRtpEncodings;
  /**
   * Adds multi-ssrc based simulcast into the given SDP media section offer.
   */
  function addLegacySimulcast({ offerMediaObject, track, numStreams }) {
      if (numStreams <= 1)
          throw new TypeError('numStreams must be greater than 1');
      let firstSsrc;
      let firstRtxSsrc;
      let streamId;
      // Get the SSRC.
      const ssrcMsidLine = (offerMediaObject.ssrcs || [])
          .find((line) => {
          if (line.attribute !== 'msid')
              return false;
          const trackId = line.value.split(' ')[1];
          if (trackId === track.id) {
              firstSsrc = line.id;
              streamId = line.value.split(' ')[0];
              return true;
          }
          else {
              return false;
          }
      });
      if (!ssrcMsidLine)
          throw new Error(`a=ssrc line with msid information not found [track.id:${track.id}]`);
      // Get the SSRC for RTX.
      (offerMediaObject.ssrcGroups || [])
          .some((line) => {
          if (line.semantics !== 'FID')
              return false;
          const ssrcs = line.ssrcs.split(/\s+/);
          if (Number(ssrcs[0]) === firstSsrc) {
              firstRtxSsrc = Number(ssrcs[1]);
              return true;
          }
          else {
              return false;
          }
      });
      const ssrcCnameLine = offerMediaObject.ssrcs
          .find((line) => (line.attribute === 'cname' && line.id === firstSsrc));
      if (!ssrcCnameLine)
          throw new Error(`a=ssrc line with cname information not found [track.id:${track.id}]`);
      const cname = ssrcCnameLine.value;
      const ssrcs = [];
      const rtxSsrcs = [];
      for (let i = 0; i < numStreams; ++i) {
          ssrcs.push(firstSsrc + i);
          if (firstRtxSsrc)
              rtxSsrcs.push(firstRtxSsrc + i);
      }
      offerMediaObject.ssrcGroups = offerMediaObject.ssrcGroups || [];
      offerMediaObject.ssrcs = offerMediaObject.ssrcs || [];
      offerMediaObject.ssrcGroups.push({
          semantics: 'SIM',
          ssrcs: ssrcs.join(' ')
      });
      for (let i = 0; i < ssrcs.length; ++i) {
          const ssrc = ssrcs[i];
          offerMediaObject.ssrcs.push({
              id: ssrc,
              attribute: 'cname',
              value: cname
          });
          offerMediaObject.ssrcs.push({
              id: ssrc,
              attribute: 'msid',
              value: `${streamId} ${track.id}`
          });
      }
      for (let i = 0; i < rtxSsrcs.length; ++i) {
          const ssrc = ssrcs[i];
          const rtxSsrc = rtxSsrcs[i];
          offerMediaObject.ssrcs.push({
              id: rtxSsrc,
              attribute: 'cname',
              value: cname
          });
          offerMediaObject.ssrcs.push({
              id: rtxSsrc,
              attribute: 'msid',
              value: `${streamId} ${track.id}`
          });
          offerMediaObject.ssrcGroups.push({
              semantics: 'FID',
              ssrcs: `${ssrc} ${rtxSsrc}`
          });
      }
  }
  exports.addLegacySimulcast = addLegacySimulcast;
  
  },{}],65:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.addLegacySimulcast = exports.getRtpEncodings = void 0;
  function getRtpEncodings({ offerMediaObject }) {
      const ssrcs = new Set();
      for (const line of offerMediaObject.ssrcs || []) {
          const ssrc = line.id;
          ssrcs.add(ssrc);
      }
      if (ssrcs.size === 0)
          throw new Error('no a=ssrc lines found');
      const ssrcToRtxSsrc = new Map();
      // First assume RTX is used.
      for (const line of offerMediaObject.ssrcGroups || []) {
          if (line.semantics !== 'FID')
              continue;
          let [ssrc, rtxSsrc] = line.ssrcs.split(/\s+/);
          ssrc = Number(ssrc);
          rtxSsrc = Number(rtxSsrc);
          if (ssrcs.has(ssrc)) {
              // Remove both the SSRC and RTX SSRC from the set so later we know that they
              // are already handled.
              ssrcs.delete(ssrc);
              ssrcs.delete(rtxSsrc);
              // Add to the map.
              ssrcToRtxSsrc.set(ssrc, rtxSsrc);
          }
      }
      // If the set of SSRCs is not empty it means that RTX is not being used, so take
      // media SSRCs from there.
      for (const ssrc of ssrcs) {
          // Add to the map.
          ssrcToRtxSsrc.set(ssrc, null);
      }
      const encodings = [];
      for (const [ssrc, rtxSsrc] of ssrcToRtxSsrc) {
          const encoding = { ssrc };
          if (rtxSsrc)
              encoding.rtx = { ssrc: rtxSsrc };
          encodings.push(encoding);
      }
      return encodings;
  }
  exports.getRtpEncodings = getRtpEncodings;
  /**
   * Adds multi-ssrc based simulcast into the given SDP media section offer.
   */
  function addLegacySimulcast({ offerMediaObject, numStreams }) {
      if (numStreams <= 1)
          throw new TypeError('numStreams must be greater than 1');
      // Get the SSRC.
      const ssrcMsidLine = (offerMediaObject.ssrcs || [])
          .find((line) => line.attribute === 'msid');
      if (!ssrcMsidLine)
          throw new Error('a=ssrc line with msid information not found');
      const [streamId, trackId] = ssrcMsidLine.value.split(' ');
      const firstSsrc = ssrcMsidLine.id;
      let firstRtxSsrc;
      // Get the SSRC for RTX.
      (offerMediaObject.ssrcGroups || [])
          .some((line) => {
          if (line.semantics !== 'FID')
              return false;
          const ssrcs = line.ssrcs.split(/\s+/);
          if (Number(ssrcs[0]) === firstSsrc) {
              firstRtxSsrc = Number(ssrcs[1]);
              return true;
          }
          else {
              return false;
          }
      });
      const ssrcCnameLine = offerMediaObject.ssrcs
          .find((line) => line.attribute === 'cname');
      if (!ssrcCnameLine)
          throw new Error('a=ssrc line with cname information not found');
      const cname = ssrcCnameLine.value;
      const ssrcs = [];
      const rtxSsrcs = [];
      for (let i = 0; i < numStreams; ++i) {
          ssrcs.push(firstSsrc + i);
          if (firstRtxSsrc)
              rtxSsrcs.push(firstRtxSsrc + i);
      }
      offerMediaObject.ssrcGroups = [];
      offerMediaObject.ssrcs = [];
      offerMediaObject.ssrcGroups.push({
          semantics: 'SIM',
          ssrcs: ssrcs.join(' ')
      });
      for (let i = 0; i < ssrcs.length; ++i) {
          const ssrc = ssrcs[i];
          offerMediaObject.ssrcs.push({
              id: ssrc,
              attribute: 'cname',
              value: cname
          });
          offerMediaObject.ssrcs.push({
              id: ssrc,
              attribute: 'msid',
              value: `${streamId} ${trackId}`
          });
      }
      for (let i = 0; i < rtxSsrcs.length; ++i) {
          const ssrc = ssrcs[i];
          const rtxSsrc = rtxSsrcs[i];
          offerMediaObject.ssrcs.push({
              id: rtxSsrc,
              attribute: 'cname',
              value: cname
          });
          offerMediaObject.ssrcs.push({
              id: rtxSsrc,
              attribute: 'msid',
              value: `${streamId} ${trackId}`
          });
          offerMediaObject.ssrcGroups.push({
              semantics: 'FID',
              ssrcs: `${ssrc} ${rtxSsrc}`
          });
      }
  }
  exports.addLegacySimulcast = addLegacySimulcast;
  
  },{}],66:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  var __importDefault = (this && this.__importDefault) || function (mod) {
      return (mod && mod.__esModule) ? mod : { "default": mod };
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.debug = exports.parseScalabilityMode = exports.detectDevice = exports.Device = exports.version = exports.types = void 0;
  const debug_1 = __importDefault(require("debug"));
  exports.debug = debug_1.default;
  const Device_1 = require("./Device");
  Object.defineProperty(exports, "Device", { enumerable: true, get: function () { return Device_1.Device; } });
  Object.defineProperty(exports, "detectDevice", { enumerable: true, get: function () { return Device_1.detectDevice; } });
  const types = __importStar(require("./types"));
  exports.types = types;
  /**
   * Expose mediasoup-client version.
   */
  exports.version = '3.6.54';
  /**
   * Expose parseScalabilityMode() function.
   */
  var scalabilityModes_1 = require("./scalabilityModes");
  Object.defineProperty(exports, "parseScalabilityMode", { enumerable: true, get: function () { return scalabilityModes_1.parse; } });
  
  },{"./Device":42,"./scalabilityModes":68,"./types":69,"debug":71}],67:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
      Object.defineProperty(o, "default", { enumerable: true, value: v });
  }) : function(o, v) {
      o["default"] = v;
  });
  var __importStar = (this && this.__importStar) || function (mod) {
      if (mod && mod.__esModule) return mod;
      var result = {};
      if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
      __setModuleDefault(result, mod);
      return result;
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.canReceive = exports.canSend = exports.generateProbatorRtpParameters = exports.reduceCodecs = exports.getSendingRemoteRtpParameters = exports.getSendingRtpParameters = exports.getRecvRtpCapabilities = exports.getExtendedRtpCapabilities = exports.validateSctpStreamParameters = exports.validateSctpParameters = exports.validateNumSctpStreams = exports.validateSctpCapabilities = exports.validateRtcpParameters = exports.validateRtpEncodingParameters = exports.validateRtpHeaderExtensionParameters = exports.validateRtpCodecParameters = exports.validateRtpParameters = exports.validateRtpHeaderExtension = exports.validateRtcpFeedback = exports.validateRtpCodecCapability = exports.validateRtpCapabilities = void 0;
  const h264 = __importStar(require("h264-profile-level-id"));
  const utils = __importStar(require("./utils"));
  const RTP_PROBATOR_MID = 'probator';
  const RTP_PROBATOR_SSRC = 1234;
  const RTP_PROBATOR_CODEC_PAYLOAD_TYPE = 127;
  /**
   * Validates RtpCapabilities. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateRtpCapabilities(caps) {
      if (typeof caps !== 'object')
          throw new TypeError('caps is not an object');
      // codecs is optional. If unset, fill with an empty array.
      if (caps.codecs && !Array.isArray(caps.codecs))
          throw new TypeError('caps.codecs is not an array');
      else if (!caps.codecs)
          caps.codecs = [];
      for (const codec of caps.codecs) {
          validateRtpCodecCapability(codec);
      }
      // headerExtensions is optional. If unset, fill with an empty array.
      if (caps.headerExtensions && !Array.isArray(caps.headerExtensions))
          throw new TypeError('caps.headerExtensions is not an array');
      else if (!caps.headerExtensions)
          caps.headerExtensions = [];
      for (const ext of caps.headerExtensions) {
          validateRtpHeaderExtension(ext);
      }
  }
  exports.validateRtpCapabilities = validateRtpCapabilities;
  /**
   * Validates RtpCodecCapability. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateRtpCodecCapability(codec) {
      const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
      if (typeof codec !== 'object')
          throw new TypeError('codec is not an object');
      // mimeType is mandatory.
      if (!codec.mimeType || typeof codec.mimeType !== 'string')
          throw new TypeError('missing codec.mimeType');
      const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
      if (!mimeTypeMatch)
          throw new TypeError('invalid codec.mimeType');
      // Just override kind with media component of mimeType.
      codec.kind = mimeTypeMatch[1].toLowerCase();
      // preferredPayloadType is optional.
      if (codec.preferredPayloadType && typeof codec.preferredPayloadType !== 'number')
          throw new TypeError('invalid codec.preferredPayloadType');
      // clockRate is mandatory.
      if (typeof codec.clockRate !== 'number')
          throw new TypeError('missing codec.clockRate');
      // channels is optional. If unset, set it to 1 (just if audio).
      if (codec.kind === 'audio') {
          if (typeof codec.channels !== 'number')
              codec.channels = 1;
      }
      else {
          delete codec.channels;
      }
      // parameters is optional. If unset, set it to an empty object.
      if (!codec.parameters || typeof codec.parameters !== 'object')
          codec.parameters = {};
      for (const key of Object.keys(codec.parameters)) {
          let value = codec.parameters[key];
          if (value === undefined) {
              codec.parameters[key] = '';
              value = '';
          }
          if (typeof value !== 'string' && typeof value !== 'number') {
              throw new TypeError(`invalid codec parameter [key:${key}s, value:${value}]`);
          }
          // Specific parameters validation.
          if (key === 'apt') {
              if (typeof value !== 'number')
                  throw new TypeError('invalid codec apt parameter');
          }
      }
      // rtcpFeedback is optional. If unset, set it to an empty array.
      if (!codec.rtcpFeedback || !Array.isArray(codec.rtcpFeedback))
          codec.rtcpFeedback = [];
      for (const fb of codec.rtcpFeedback) {
          validateRtcpFeedback(fb);
      }
  }
  exports.validateRtpCodecCapability = validateRtpCodecCapability;
  /**
   * Validates RtcpFeedback. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateRtcpFeedback(fb) {
      if (typeof fb !== 'object')
          throw new TypeError('fb is not an object');
      // type is mandatory.
      if (!fb.type || typeof fb.type !== 'string')
          throw new TypeError('missing fb.type');
      // parameter is optional. If unset set it to an empty string.
      if (!fb.parameter || typeof fb.parameter !== 'string')
          fb.parameter = '';
  }
  exports.validateRtcpFeedback = validateRtcpFeedback;
  /**
   * Validates RtpHeaderExtension. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateRtpHeaderExtension(ext) {
      if (typeof ext !== 'object')
          throw new TypeError('ext is not an object');
      // kind is mandatory.
      if (ext.kind !== 'audio' && ext.kind !== 'video')
          throw new TypeError('invalid ext.kind');
      // uri is mandatory.
      if (!ext.uri || typeof ext.uri !== 'string')
          throw new TypeError('missing ext.uri');
      // preferredId is mandatory.
      if (typeof ext.preferredId !== 'number')
          throw new TypeError('missing ext.preferredId');
      // preferredEncrypt is optional. If unset set it to false.
      if (ext.preferredEncrypt && typeof ext.preferredEncrypt !== 'boolean')
          throw new TypeError('invalid ext.preferredEncrypt');
      else if (!ext.preferredEncrypt)
          ext.preferredEncrypt = false;
      // direction is optional. If unset set it to sendrecv.
      if (ext.direction && typeof ext.direction !== 'string')
          throw new TypeError('invalid ext.direction');
      else if (!ext.direction)
          ext.direction = 'sendrecv';
  }
  exports.validateRtpHeaderExtension = validateRtpHeaderExtension;
  /**
   * Validates RtpParameters. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateRtpParameters(params) {
      if (typeof params !== 'object')
          throw new TypeError('params is not an object');
      // mid is optional.
      if (params.mid && typeof params.mid !== 'string')
          throw new TypeError('params.mid is not a string');
      // codecs is mandatory.
      if (!Array.isArray(params.codecs))
          throw new TypeError('missing params.codecs');
      for (const codec of params.codecs) {
          validateRtpCodecParameters(codec);
      }
      // headerExtensions is optional. If unset, fill with an empty array.
      if (params.headerExtensions && !Array.isArray(params.headerExtensions))
          throw new TypeError('params.headerExtensions is not an array');
      else if (!params.headerExtensions)
          params.headerExtensions = [];
      for (const ext of params.headerExtensions) {
          validateRtpHeaderExtensionParameters(ext);
      }
      // encodings is optional. If unset, fill with an empty array.
      if (params.encodings && !Array.isArray(params.encodings))
          throw new TypeError('params.encodings is not an array');
      else if (!params.encodings)
          params.encodings = [];
      for (const encoding of params.encodings) {
          validateRtpEncodingParameters(encoding);
      }
      // rtcp is optional. If unset, fill with an empty object.
      if (params.rtcp && typeof params.rtcp !== 'object')
          throw new TypeError('params.rtcp is not an object');
      else if (!params.rtcp)
          params.rtcp = {};
      validateRtcpParameters(params.rtcp);
  }
  exports.validateRtpParameters = validateRtpParameters;
  /**
   * Validates RtpCodecParameters. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateRtpCodecParameters(codec) {
      const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
      if (typeof codec !== 'object')
          throw new TypeError('codec is not an object');
      // mimeType is mandatory.
      if (!codec.mimeType || typeof codec.mimeType !== 'string')
          throw new TypeError('missing codec.mimeType');
      const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
      if (!mimeTypeMatch)
          throw new TypeError('invalid codec.mimeType');
      // payloadType is mandatory.
      if (typeof codec.payloadType !== 'number')
          throw new TypeError('missing codec.payloadType');
      // clockRate is mandatory.
      if (typeof codec.clockRate !== 'number')
          throw new TypeError('missing codec.clockRate');
      const kind = mimeTypeMatch[1].toLowerCase();
      // channels is optional. If unset, set it to 1 (just if audio).
      if (kind === 'audio') {
          if (typeof codec.channels !== 'number')
              codec.channels = 1;
      }
      else {
          delete codec.channels;
      }
      // parameters is optional. If unset, set it to an empty object.
      if (!codec.parameters || typeof codec.parameters !== 'object')
          codec.parameters = {};
      for (const key of Object.keys(codec.parameters)) {
          let value = codec.parameters[key];
          if (value === undefined) {
              codec.parameters[key] = '';
              value = '';
          }
          if (typeof value !== 'string' && typeof value !== 'number') {
              throw new TypeError(`invalid codec parameter [key:${key}s, value:${value}]`);
          }
          // Specific parameters validation.
          if (key === 'apt') {
              if (typeof value !== 'number')
                  throw new TypeError('invalid codec apt parameter');
          }
      }
      // rtcpFeedback is optional. If unset, set it to an empty array.
      if (!codec.rtcpFeedback || !Array.isArray(codec.rtcpFeedback))
          codec.rtcpFeedback = [];
      for (const fb of codec.rtcpFeedback) {
          validateRtcpFeedback(fb);
      }
  }
  exports.validateRtpCodecParameters = validateRtpCodecParameters;
  /**
   * Validates RtpHeaderExtensionParameteters. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateRtpHeaderExtensionParameters(ext) {
      if (typeof ext !== 'object')
          throw new TypeError('ext is not an object');
      // uri is mandatory.
      if (!ext.uri || typeof ext.uri !== 'string')
          throw new TypeError('missing ext.uri');
      // id is mandatory.
      if (typeof ext.id !== 'number')
          throw new TypeError('missing ext.id');
      // encrypt is optional. If unset set it to false.
      if (ext.encrypt && typeof ext.encrypt !== 'boolean')
          throw new TypeError('invalid ext.encrypt');
      else if (!ext.encrypt)
          ext.encrypt = false;
      // parameters is optional. If unset, set it to an empty object.
      if (!ext.parameters || typeof ext.parameters !== 'object')
          ext.parameters = {};
      for (const key of Object.keys(ext.parameters)) {
          let value = ext.parameters[key];
          if (value === undefined) {
              ext.parameters[key] = '';
              value = '';
          }
          if (typeof value !== 'string' && typeof value !== 'number')
              throw new TypeError('invalid header extension parameter');
      }
  }
  exports.validateRtpHeaderExtensionParameters = validateRtpHeaderExtensionParameters;
  /**
   * Validates RtpEncodingParameters. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateRtpEncodingParameters(encoding) {
      if (typeof encoding !== 'object')
          throw new TypeError('encoding is not an object');
      // ssrc is optional.
      if (encoding.ssrc && typeof encoding.ssrc !== 'number')
          throw new TypeError('invalid encoding.ssrc');
      // rid is optional.
      if (encoding.rid && typeof encoding.rid !== 'string')
          throw new TypeError('invalid encoding.rid');
      // rtx is optional.
      if (encoding.rtx && typeof encoding.rtx !== 'object') {
          throw new TypeError('invalid encoding.rtx');
      }
      else if (encoding.rtx) {
          // RTX ssrc is mandatory if rtx is present.
          if (typeof encoding.rtx.ssrc !== 'number')
              throw new TypeError('missing encoding.rtx.ssrc');
      }
      // dtx is optional. If unset set it to false.
      if (!encoding.dtx || typeof encoding.dtx !== 'boolean')
          encoding.dtx = false;
      // scalabilityMode is optional.
      if (encoding.scalabilityMode && typeof encoding.scalabilityMode !== 'string')
          throw new TypeError('invalid encoding.scalabilityMode');
  }
  exports.validateRtpEncodingParameters = validateRtpEncodingParameters;
  /**
   * Validates RtcpParameters. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateRtcpParameters(rtcp) {
      if (typeof rtcp !== 'object')
          throw new TypeError('rtcp is not an object');
      // cname is optional.
      if (rtcp.cname && typeof rtcp.cname !== 'string')
          throw new TypeError('invalid rtcp.cname');
      // reducedSize is optional. If unset set it to true.
      if (!rtcp.reducedSize || typeof rtcp.reducedSize !== 'boolean')
          rtcp.reducedSize = true;
  }
  exports.validateRtcpParameters = validateRtcpParameters;
  /**
   * Validates SctpCapabilities. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateSctpCapabilities(caps) {
      if (typeof caps !== 'object')
          throw new TypeError('caps is not an object');
      // numStreams is mandatory.
      if (!caps.numStreams || typeof caps.numStreams !== 'object')
          throw new TypeError('missing caps.numStreams');
      validateNumSctpStreams(caps.numStreams);
  }
  exports.validateSctpCapabilities = validateSctpCapabilities;
  /**
   * Validates NumSctpStreams. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateNumSctpStreams(numStreams) {
      if (typeof numStreams !== 'object')
          throw new TypeError('numStreams is not an object');
      // OS is mandatory.
      if (typeof numStreams.OS !== 'number')
          throw new TypeError('missing numStreams.OS');
      // MIS is mandatory.
      if (typeof numStreams.MIS !== 'number')
          throw new TypeError('missing numStreams.MIS');
  }
  exports.validateNumSctpStreams = validateNumSctpStreams;
  /**
   * Validates SctpParameters. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateSctpParameters(params) {
      if (typeof params !== 'object')
          throw new TypeError('params is not an object');
      // port is mandatory.
      if (typeof params.port !== 'number')
          throw new TypeError('missing params.port');
      // OS is mandatory.
      if (typeof params.OS !== 'number')
          throw new TypeError('missing params.OS');
      // MIS is mandatory.
      if (typeof params.MIS !== 'number')
          throw new TypeError('missing params.MIS');
      // maxMessageSize is mandatory.
      if (typeof params.maxMessageSize !== 'number')
          throw new TypeError('missing params.maxMessageSize');
  }
  exports.validateSctpParameters = validateSctpParameters;
  /**
   * Validates SctpStreamParameters. It may modify given data by adding missing
   * fields with default values.
   * It throws if invalid.
   */
  function validateSctpStreamParameters(params) {
      if (typeof params !== 'object')
          throw new TypeError('params is not an object');
      // streamId is mandatory.
      if (typeof params.streamId !== 'number')
          throw new TypeError('missing params.streamId');
      // ordered is optional.
      let orderedGiven = false;
      if (typeof params.ordered === 'boolean')
          orderedGiven = true;
      else
          params.ordered = true;
      // maxPacketLifeTime is optional.
      if (params.maxPacketLifeTime && typeof params.maxPacketLifeTime !== 'number')
          throw new TypeError('invalid params.maxPacketLifeTime');
      // maxRetransmits is optional.
      if (params.maxRetransmits && typeof params.maxRetransmits !== 'number')
          throw new TypeError('invalid params.maxRetransmits');
      if (params.maxPacketLifeTime && params.maxRetransmits)
          throw new TypeError('cannot provide both maxPacketLifeTime and maxRetransmits');
      if (orderedGiven &&
          params.ordered &&
          (params.maxPacketLifeTime || params.maxRetransmits)) {
          throw new TypeError('cannot be ordered with maxPacketLifeTime or maxRetransmits');
      }
      else if (!orderedGiven && (params.maxPacketLifeTime || params.maxRetransmits)) {
          params.ordered = false;
      }
      // label is optional.
      if (params.label && typeof params.label !== 'string')
          throw new TypeError('invalid params.label');
      // protocol is optional.
      if (params.protocol && typeof params.protocol !== 'string')
          throw new TypeError('invalid params.protocol');
  }
  exports.validateSctpStreamParameters = validateSctpStreamParameters;
  /**
   * Generate extended RTP capabilities for sending and receiving.
   */
  function getExtendedRtpCapabilities(localCaps, remoteCaps) {
      const extendedRtpCapabilities = {
          codecs: [],
          headerExtensions: []
      };
      // Match media codecs and keep the order preferred by remoteCaps.
      for (const remoteCodec of remoteCaps.codecs || []) {
          if (isRtxCodec(remoteCodec))
              continue;
          const matchingLocalCodec = (localCaps.codecs || [])
              .find((localCodec) => (matchCodecs(localCodec, remoteCodec, { strict: true, modify: true })));
          if (!matchingLocalCodec)
              continue;
          const extendedCodec = {
              mimeType: matchingLocalCodec.mimeType,
              kind: matchingLocalCodec.kind,
              clockRate: matchingLocalCodec.clockRate,
              channels: matchingLocalCodec.channels,
              localPayloadType: matchingLocalCodec.preferredPayloadType,
              localRtxPayloadType: undefined,
              remotePayloadType: remoteCodec.preferredPayloadType,
              remoteRtxPayloadType: undefined,
              localParameters: matchingLocalCodec.parameters,
              remoteParameters: remoteCodec.parameters,
              rtcpFeedback: reduceRtcpFeedback(matchingLocalCodec, remoteCodec)
          };
          extendedRtpCapabilities.codecs.push(extendedCodec);
      }
      // Match RTX codecs.
      for (const extendedCodec of extendedRtpCapabilities.codecs) {
          const matchingLocalRtxCodec = localCaps.codecs
              .find((localCodec) => (isRtxCodec(localCodec) &&
              localCodec.parameters.apt === extendedCodec.localPayloadType));
          const matchingRemoteRtxCodec = remoteCaps.codecs
              .find((remoteCodec) => (isRtxCodec(remoteCodec) &&
              remoteCodec.parameters.apt === extendedCodec.remotePayloadType));
          if (matchingLocalRtxCodec && matchingRemoteRtxCodec) {
              extendedCodec.localRtxPayloadType = matchingLocalRtxCodec.preferredPayloadType;
              extendedCodec.remoteRtxPayloadType = matchingRemoteRtxCodec.preferredPayloadType;
          }
      }
      // Match header extensions.
      for (const remoteExt of remoteCaps.headerExtensions) {
          const matchingLocalExt = localCaps.headerExtensions
              .find((localExt) => (matchHeaderExtensions(localExt, remoteExt)));
          if (!matchingLocalExt)
              continue;
          const extendedExt = {
              kind: remoteExt.kind,
              uri: remoteExt.uri,
              sendId: matchingLocalExt.preferredId,
              recvId: remoteExt.preferredId,
              encrypt: matchingLocalExt.preferredEncrypt,
              direction: 'sendrecv'
          };
          switch (remoteExt.direction) {
              case 'sendrecv':
                  extendedExt.direction = 'sendrecv';
                  break;
              case 'recvonly':
                  extendedExt.direction = 'sendonly';
                  break;
              case 'sendonly':
                  extendedExt.direction = 'recvonly';
                  break;
              case 'inactive':
                  extendedExt.direction = 'inactive';
                  break;
          }
          extendedRtpCapabilities.headerExtensions.push(extendedExt);
      }
      return extendedRtpCapabilities;
  }
  exports.getExtendedRtpCapabilities = getExtendedRtpCapabilities;
  /**
   * Generate RTP capabilities for receiving media based on the given extended
   * RTP capabilities.
   */
  function getRecvRtpCapabilities(extendedRtpCapabilities) {
      const rtpCapabilities = {
          codecs: [],
          headerExtensions: []
      };
      for (const extendedCodec of extendedRtpCapabilities.codecs) {
          const codec = {
              mimeType: extendedCodec.mimeType,
              kind: extendedCodec.kind,
              preferredPayloadType: extendedCodec.remotePayloadType,
              clockRate: extendedCodec.clockRate,
              channels: extendedCodec.channels,
              parameters: extendedCodec.localParameters,
              rtcpFeedback: extendedCodec.rtcpFeedback
          };
          rtpCapabilities.codecs.push(codec);
          // Add RTX codec.
          if (!extendedCodec.remoteRtxPayloadType)
              continue;
          const rtxCodec = {
              mimeType: `${extendedCodec.kind}/rtx`,
              kind: extendedCodec.kind,
              preferredPayloadType: extendedCodec.remoteRtxPayloadType,
              clockRate: extendedCodec.clockRate,
              parameters: {
                  apt: extendedCodec.remotePayloadType
              },
              rtcpFeedback: []
          };
          rtpCapabilities.codecs.push(rtxCodec);
          // TODO: In the future, we need to add FEC, CN, etc, codecs.
      }
      for (const extendedExtension of extendedRtpCapabilities.headerExtensions) {
          // Ignore RTP extensions not valid for receiving.
          if (extendedExtension.direction !== 'sendrecv' &&
              extendedExtension.direction !== 'recvonly') {
              continue;
          }
          const ext = {
              kind: extendedExtension.kind,
              uri: extendedExtension.uri,
              preferredId: extendedExtension.recvId,
              preferredEncrypt: extendedExtension.encrypt,
              direction: extendedExtension.direction
          };
          rtpCapabilities.headerExtensions.push(ext);
      }
      return rtpCapabilities;
  }
  exports.getRecvRtpCapabilities = getRecvRtpCapabilities;
  /**
   * Generate RTP parameters of the given kind for sending media.
   * NOTE: mid, encodings and rtcp fields are left empty.
   */
  function getSendingRtpParameters(kind, extendedRtpCapabilities) {
      const rtpParameters = {
          mid: undefined,
          codecs: [],
          headerExtensions: [],
          encodings: [],
          rtcp: {}
      };
      for (const extendedCodec of extendedRtpCapabilities.codecs) {
          if (extendedCodec.kind !== kind)
              continue;
          const codec = {
              mimeType: extendedCodec.mimeType,
              payloadType: extendedCodec.localPayloadType,
              clockRate: extendedCodec.clockRate,
              channels: extendedCodec.channels,
              parameters: extendedCodec.localParameters,
              rtcpFeedback: extendedCodec.rtcpFeedback
          };
          rtpParameters.codecs.push(codec);
          // Add RTX codec.
          if (extendedCodec.localRtxPayloadType) {
              const rtxCodec = {
                  mimeType: `${extendedCodec.kind}/rtx`,
                  payloadType: extendedCodec.localRtxPayloadType,
                  clockRate: extendedCodec.clockRate,
                  parameters: {
                      apt: extendedCodec.localPayloadType
                  },
                  rtcpFeedback: []
              };
              rtpParameters.codecs.push(rtxCodec);
          }
      }
      for (const extendedExtension of extendedRtpCapabilities.headerExtensions) {
          // Ignore RTP extensions of a different kind and those not valid for sending.
          if ((extendedExtension.kind && extendedExtension.kind !== kind) ||
              (extendedExtension.direction !== 'sendrecv' &&
                  extendedExtension.direction !== 'sendonly')) {
              continue;
          }
          const ext = {
              uri: extendedExtension.uri,
              id: extendedExtension.sendId,
              encrypt: extendedExtension.encrypt,
              parameters: {}
          };
          rtpParameters.headerExtensions.push(ext);
      }
      return rtpParameters;
  }
  exports.getSendingRtpParameters = getSendingRtpParameters;
  /**
   * Generate RTP parameters of the given kind suitable for the remote SDP answer.
   */
  function getSendingRemoteRtpParameters(kind, extendedRtpCapabilities) {
      const rtpParameters = {
          mid: undefined,
          codecs: [],
          headerExtensions: [],
          encodings: [],
          rtcp: {}
      };
      for (const extendedCodec of extendedRtpCapabilities.codecs) {
          if (extendedCodec.kind !== kind)
              continue;
          const codec = {
              mimeType: extendedCodec.mimeType,
              payloadType: extendedCodec.localPayloadType,
              clockRate: extendedCodec.clockRate,
              channels: extendedCodec.channels,
              parameters: extendedCodec.remoteParameters,
              rtcpFeedback: extendedCodec.rtcpFeedback
          };
          rtpParameters.codecs.push(codec);
          // Add RTX codec.
          if (extendedCodec.localRtxPayloadType) {
              const rtxCodec = {
                  mimeType: `${extendedCodec.kind}/rtx`,
                  payloadType: extendedCodec.localRtxPayloadType,
                  clockRate: extendedCodec.clockRate,
                  parameters: {
                      apt: extendedCodec.localPayloadType
                  },
                  rtcpFeedback: []
              };
              rtpParameters.codecs.push(rtxCodec);
          }
      }
      for (const extendedExtension of extendedRtpCapabilities.headerExtensions) {
          // Ignore RTP extensions of a different kind and those not valid for sending.
          if ((extendedExtension.kind && extendedExtension.kind !== kind) ||
              (extendedExtension.direction !== 'sendrecv' &&
                  extendedExtension.direction !== 'sendonly')) {
              continue;
          }
          const ext = {
              uri: extendedExtension.uri,
              id: extendedExtension.sendId,
              encrypt: extendedExtension.encrypt,
              parameters: {}
          };
          rtpParameters.headerExtensions.push(ext);
      }
      // Reduce codecs' RTCP feedback. Use Transport-CC if available, REMB otherwise.
      if (rtpParameters.headerExtensions.some((ext) => (ext.uri === 'http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01'))) {
          for (const codec of rtpParameters.codecs) {
              codec.rtcpFeedback = (codec.rtcpFeedback || [])
                  .filter((fb) => fb.type !== 'goog-remb');
          }
      }
      else if (rtpParameters.headerExtensions.some((ext) => (ext.uri === 'http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time'))) {
          for (const codec of rtpParameters.codecs) {
              codec.rtcpFeedback = (codec.rtcpFeedback || [])
                  .filter((fb) => fb.type !== 'transport-cc');
          }
      }
      else {
          for (const codec of rtpParameters.codecs) {
              codec.rtcpFeedback = (codec.rtcpFeedback || [])
                  .filter((fb) => (fb.type !== 'transport-cc' &&
                  fb.type !== 'goog-remb'));
          }
      }
      return rtpParameters;
  }
  exports.getSendingRemoteRtpParameters = getSendingRemoteRtpParameters;
  /**
   * Reduce given codecs by returning an array of codecs "compatible" with the
   * given capability codec. If no capability codec is given, take the first
   * one(s).
   *
   * Given codecs must be generated by ortc.getSendingRtpParameters() or
   * ortc.getSendingRemoteRtpParameters().
   *
   * The returned array of codecs also include a RTX codec if available.
   */
  function reduceCodecs(codecs, capCodec) {
      const filteredCodecs = [];
      // If no capability codec is given, take the first one (and RTX).
      if (!capCodec) {
          filteredCodecs.push(codecs[0]);
          if (isRtxCodec(codecs[1]))
              filteredCodecs.push(codecs[1]);
      }
      // Otherwise look for a compatible set of codecs.
      else {
          for (let idx = 0; idx < codecs.length; ++idx) {
              if (matchCodecs(codecs[idx], capCodec)) {
                  filteredCodecs.push(codecs[idx]);
                  if (isRtxCodec(codecs[idx + 1]))
                      filteredCodecs.push(codecs[idx + 1]);
                  break;
              }
          }
          if (filteredCodecs.length === 0)
              throw new TypeError('no matching codec found');
      }
      return filteredCodecs;
  }
  exports.reduceCodecs = reduceCodecs;
  /**
   * Create RTP parameters for a Consumer for the RTP probator.
   */
  function generateProbatorRtpParameters(videoRtpParameters) {
      // Clone given reference video RTP parameters.
      videoRtpParameters = utils.clone(videoRtpParameters, {});
      // This may throw.
      validateRtpParameters(videoRtpParameters);
      const rtpParameters = {
          mid: RTP_PROBATOR_MID,
          codecs: [],
          headerExtensions: [],
          encodings: [{ ssrc: RTP_PROBATOR_SSRC }],
          rtcp: { cname: 'probator' }
      };
      rtpParameters.codecs.push(videoRtpParameters.codecs[0]);
      rtpParameters.codecs[0].payloadType = RTP_PROBATOR_CODEC_PAYLOAD_TYPE;
      rtpParameters.headerExtensions = videoRtpParameters.headerExtensions;
      return rtpParameters;
  }
  exports.generateProbatorRtpParameters = generateProbatorRtpParameters;
  /**
   * Whether media can be sent based on the given RTP capabilities.
   */
  function canSend(kind, extendedRtpCapabilities) {
      return extendedRtpCapabilities.codecs.
          some((codec) => codec.kind === kind);
  }
  exports.canSend = canSend;
  /**
   * Whether the given RTP parameters can be received with the given RTP
   * capabilities.
   */
  function canReceive(rtpParameters, extendedRtpCapabilities) {
      // This may throw.
      validateRtpParameters(rtpParameters);
      if (rtpParameters.codecs.length === 0)
          return false;
      const firstMediaCodec = rtpParameters.codecs[0];
      return extendedRtpCapabilities.codecs
          .some((codec) => codec.remotePayloadType === firstMediaCodec.payloadType);
  }
  exports.canReceive = canReceive;
  function isRtxCodec(codec) {
      if (!codec)
          return false;
      return /.+\/rtx$/i.test(codec.mimeType);
  }
  function matchCodecs(aCodec, bCodec, { strict = false, modify = false } = {}) {
      const aMimeType = aCodec.mimeType.toLowerCase();
      const bMimeType = bCodec.mimeType.toLowerCase();
      if (aMimeType !== bMimeType)
          return false;
      if (aCodec.clockRate !== bCodec.clockRate)
          return false;
      if (aCodec.channels !== bCodec.channels)
          return false;
      // Per codec special checks.
      switch (aMimeType) {
          case 'video/h264':
              {
                  if (strict) {
                      const aPacketizationMode = aCodec.parameters['packetization-mode'] || 0;
                      const bPacketizationMode = bCodec.parameters['packetization-mode'] || 0;
                      if (aPacketizationMode !== bPacketizationMode)
                          return false;
                      if (!h264.isSameProfile(aCodec.parameters, bCodec.parameters))
                          return false;
                      let selectedProfileLevelId;
                      try {
                          selectedProfileLevelId =
                              h264.generateProfileLevelIdForAnswer(aCodec.parameters, bCodec.parameters);
                      }
                      catch (error) {
                          return false;
                      }
                      if (modify) {
                          if (selectedProfileLevelId) {
                              aCodec.parameters['profile-level-id'] = selectedProfileLevelId;
                              bCodec.parameters['profile-level-id'] = selectedProfileLevelId;
                          }
                          else {
                              delete aCodec.parameters['profile-level-id'];
                              delete bCodec.parameters['profile-level-id'];
                          }
                      }
                  }
                  break;
              }
          case 'video/vp9':
              {
                  if (strict) {
                      const aProfileId = aCodec.parameters['profile-id'] || 0;
                      const bProfileId = bCodec.parameters['profile-id'] || 0;
                      if (aProfileId !== bProfileId)
                          return false;
                  }
                  break;
              }
      }
      return true;
  }
  function matchHeaderExtensions(aExt, bExt) {
      if (aExt.kind && bExt.kind && aExt.kind !== bExt.kind)
          return false;
      if (aExt.uri !== bExt.uri)
          return false;
      return true;
  }
  function reduceRtcpFeedback(codecA, codecB) {
      const reducedRtcpFeedback = [];
      for (const aFb of codecA.rtcpFeedback || []) {
          const matchingBFb = (codecB.rtcpFeedback || [])
              .find((bFb) => (bFb.type === aFb.type &&
              (bFb.parameter === aFb.parameter || (!bFb.parameter && !aFb.parameter))));
          if (matchingBFb)
              reducedRtcpFeedback.push(matchingBFb);
      }
      return reducedRtcpFeedback;
  }
  
  },{"./utils":70,"h264-profile-level-id":30}],68:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.parse = void 0;
  const ScalabilityModeRegex = new RegExp('^[LS]([1-9]\\d{0,1})T([1-9]\\d{0,1})');
  function parse(scalabilityMode) {
      const match = ScalabilityModeRegex.exec(scalabilityMode || '');
      if (match) {
          return {
              spatialLayers: Number(match[1]),
              temporalLayers: Number(match[2])
          };
      }
      else {
          return {
              spatialLayers: 1,
              temporalLayers: 1
          };
      }
  }
  exports.parse = parse;
  
  },{}],69:[function(require,module,exports){
  "use strict";
  var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      var desc = Object.getOwnPropertyDescriptor(m, k);
      if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
        desc = { enumerable: true, get: function() { return m[k]; } };
      }
      Object.defineProperty(o, k2, desc);
  }) : (function(o, m, k, k2) {
      if (k2 === undefined) k2 = k;
      o[k2] = m[k];
  }));
  var __exportStar = (this && this.__exportStar) || function(m, exports) {
      for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  __exportStar(require("./Device"), exports);
  __exportStar(require("./Transport"), exports);
  __exportStar(require("./Producer"), exports);
  __exportStar(require("./Consumer"), exports);
  __exportStar(require("./DataProducer"), exports);
  __exportStar(require("./DataConsumer"), exports);
  __exportStar(require("./RtpParameters"), exports);
  __exportStar(require("./SctpParameters"), exports);
  __exportStar(require("./handlers/HandlerInterface"), exports);
  __exportStar(require("./errors"), exports);
  
  },{"./Consumer":39,"./DataConsumer":40,"./DataProducer":41,"./Device":42,"./Producer":45,"./RtpParameters":46,"./SctpParameters":47,"./Transport":48,"./errors":49,"./handlers/HandlerInterface":56}],70:[function(require,module,exports){
  "use strict";
  Object.defineProperty(exports, "__esModule", { value: true });
  exports.generateRandomNumber = exports.clone = void 0;
  /**
   * Clones the given data.
   */
  function clone(data, defaultValue) {
      if (typeof data === 'undefined')
          return defaultValue;
      return JSON.parse(JSON.stringify(data));
  }
  exports.clone = clone;
  /**
   * Generates a random positive integer.
   */
  function generateRandomNumber() {
      return Math.round(Math.random() * 10000000);
  }
  exports.generateRandomNumber = generateRandomNumber;
  
  },{}],71:[function(require,module,exports){
  arguments[4][31][0].apply(exports,arguments)
  },{"./common":72,"_process":77,"dup":31}],72:[function(require,module,exports){
  arguments[4][32][0].apply(exports,arguments)
  },{"dup":32,"ms":73}],73:[function(require,module,exports){
  arguments[4][33][0].apply(exports,arguments)
  },{"dup":33}],74:[function(require,module,exports){
  /**
   * Helpers.
   */
  
  var s = 1000;
  var m = s * 60;
  var h = m * 60;
  var d = h * 24;
  var y = d * 365.25;
  
  /**
   * Parse or format the given `val`.
   *
   * Options:
   *
   *  - `long` verbose formatting [false]
   *
   * @param {String|Number} val
   * @param {Object} [options]
   * @throws {Error} throw an error if val is not a non-empty string or a number
   * @return {String|Number}
   * @api public
   */
  
  module.exports = function(val, options) {
    options = options || {};
    var type = typeof val;
    if (type === 'string' && val.length > 0) {
      return parse(val);
    } else if (type === 'number' && isNaN(val) === false) {
      return options.long ? fmtLong(val) : fmtShort(val);
    }
    throw new Error(
      'val is not a non-empty string or a valid number. val=' +
        JSON.stringify(val)
    );
  };
  
  /**
   * Parse the given `str` and return milliseconds.
   *
   * @param {String} str
   * @return {Number}
   * @api private
   */
  
  function parse(str) {
    str = String(str);
    if (str.length > 100) {
      return;
    }
    var match = /^((?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|years?|yrs?|y)?$/i.exec(
      str
    );
    if (!match) {
      return;
    }
    var n = parseFloat(match[1]);
    var type = (match[2] || 'ms').toLowerCase();
    switch (type) {
      case 'years':
      case 'year':
      case 'yrs':
      case 'yr':
      case 'y':
        return n * y;
      case 'days':
      case 'day':
      case 'd':
        return n * d;
      case 'hours':
      case 'hour':
      case 'hrs':
      case 'hr':
      case 'h':
        return n * h;
      case 'minutes':
      case 'minute':
      case 'mins':
      case 'min':
      case 'm':
        return n * m;
      case 'seconds':
      case 'second':
      case 'secs':
      case 'sec':
      case 's':
        return n * s;
      case 'milliseconds':
      case 'millisecond':
      case 'msecs':
      case 'msec':
      case 'ms':
        return n;
      default:
        return undefined;
    }
  }
  
  /**
   * Short format for `ms`.
   *
   * @param {Number} ms
   * @return {String}
   * @api private
   */
  
  function fmtShort(ms) {
    if (ms >= d) {
      return Math.round(ms / d) + 'd';
    }
    if (ms >= h) {
      return Math.round(ms / h) + 'h';
    }
    if (ms >= m) {
      return Math.round(ms / m) + 'm';
    }
    if (ms >= s) {
      return Math.round(ms / s) + 's';
    }
    return ms + 'ms';
  }
  
  /**
   * Long format for `ms`.
   *
   * @param {Number} ms
   * @return {String}
   * @api private
   */
  
  function fmtLong(ms) {
    return plural(ms, d, 'day') ||
      plural(ms, h, 'hour') ||
      plural(ms, m, 'minute') ||
      plural(ms, s, 'second') ||
      ms + ' ms';
  }
  
  /**
   * Pluralization helper.
   */
  
  function plural(ms, n, name) {
    if (ms < n) {
      return;
    }
    if (ms < n * 1.5) {
      return Math.floor(ms / n) + ' ' + name;
    }
    return Math.ceil(ms / n) + ' ' + name + 's';
  }
  
  },{}],75:[function(require,module,exports){
  /**
   * Compiles a querystring
   * Returns string representation of the object
   *
   * @param {Object}
   * @api private
   */
  
  exports.encode = function (obj) {
    var str = '';
  
    for (var i in obj) {
      if (obj.hasOwnProperty(i)) {
        if (str.length) str += '&';
        str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);
      }
    }
  
    return str;
  };
  
  /**
   * Parses a simple querystring into an object
   *
   * @param {String} qs
   * @api private
   */
  
  exports.decode = function(qs){
    var qry = {};
    var pairs = qs.split('&');
    for (var i = 0, l = pairs.length; i < l; i++) {
      var pair = pairs[i].split('=');
      qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);
    }
    return qry;
  };
  
  },{}],76:[function(require,module,exports){
  /**
   * Parses an URI
   *
   * @author Steven Levithan <stevenlevithan.com> (MIT license)
   * @api private
   */
  
  var re = /^(?:(?![^:@]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/;
  
  var parts = [
      'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'
  ];
  
  module.exports = function parseuri(str) {
      var src = str,
          b = str.indexOf('['),
          e = str.indexOf(']');
  
      if (b != -1 && e != -1) {
          str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);
      }
  
      var m = re.exec(str || ''),
          uri = {},
          i = 14;
  
      while (i--) {
          uri[parts[i]] = m[i] || '';
      }
  
      if (b != -1 && e != -1) {
          uri.source = src;
          uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');
          uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');
          uri.ipv6uri = true;
      }
  
      uri.pathNames = pathNames(uri, uri['path']);
      uri.queryKey = queryKey(uri, uri['query']);
  
      return uri;
  };
  
  function pathNames(obj, path) {
      var regx = /\/{2,9}/g,
          names = path.replace(regx, "/").split("/");
  
      if (path.substr(0, 1) == '/' || path.length === 0) {
          names.splice(0, 1);
      }
      if (path.substr(path.length - 1, 1) == '/') {
          names.splice(names.length - 1, 1);
      }
  
      return names;
  }
  
  function queryKey(uri, query) {
      var data = {};
  
      query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {
          if ($1) {
              data[$1] = $2;
          }
      });
  
      return data;
  }
  
  },{}],77:[function(require,module,exports){
  // shim for using process in browser
  var process = module.exports = {};
  
  // cached from whatever global is present so that test runners that stub it
  // don't break things.  But we need to wrap it in a try catch in case it is
  // wrapped in strict mode code which doesn't define any globals.  It's inside a
  // function because try/catches deoptimize in certain engines.
  
  var cachedSetTimeout;
  var cachedClearTimeout;
  
  function defaultSetTimout() {
      throw new Error('setTimeout has not been defined');
  }
  function defaultClearTimeout () {
      throw new Error('clearTimeout has not been defined');
  }
  (function () {
      try {
          if (typeof setTimeout === 'function') {
              cachedSetTimeout = setTimeout;
          } else {
              cachedSetTimeout = defaultSetTimout;
          }
      } catch (e) {
          cachedSetTimeout = defaultSetTimout;
      }
      try {
          if (typeof clearTimeout === 'function') {
              cachedClearTimeout = clearTimeout;
          } else {
              cachedClearTimeout = defaultClearTimeout;
          }
      } catch (e) {
          cachedClearTimeout = defaultClearTimeout;
      }
  } ())
  function runTimeout(fun) {
      if (cachedSetTimeout === setTimeout) {
          //normal enviroments in sane situations
          return setTimeout(fun, 0);
      }
      // if setTimeout wasn't available but was latter defined
      if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
          cachedSetTimeout = setTimeout;
          return setTimeout(fun, 0);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedSetTimeout(fun, 0);
      } catch(e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
              return cachedSetTimeout.call(null, fun, 0);
          } catch(e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
              return cachedSetTimeout.call(this, fun, 0);
          }
      }
  
  
  }
  function runClearTimeout(marker) {
      if (cachedClearTimeout === clearTimeout) {
          //normal enviroments in sane situations
          return clearTimeout(marker);
      }
      // if clearTimeout wasn't available but was latter defined
      if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
          cachedClearTimeout = clearTimeout;
          return clearTimeout(marker);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedClearTimeout(marker);
      } catch (e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
              return cachedClearTimeout.call(null, marker);
          } catch (e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
              // Some versions of I.E. have different rules for clearTimeout vs setTimeout
              return cachedClearTimeout.call(this, marker);
          }
      }
  
  
  
  }
  var queue = [];
  var draining = false;
  var currentQueue;
  var queueIndex = -1;
  
  function cleanUpNextTick() {
      if (!draining || !currentQueue) {
          return;
      }
      draining = false;
      if (currentQueue.length) {
          queue = currentQueue.concat(queue);
      } else {
          queueIndex = -1;
      }
      if (queue.length) {
          drainQueue();
      }
  }
  
  function drainQueue() {
      if (draining) {
          return;
      }
      var timeout = runTimeout(cleanUpNextTick);
      draining = true;
  
      var len = queue.length;
      while(len) {
          currentQueue = queue;
          queue = [];
          while (++queueIndex < len) {
              if (currentQueue) {
                  currentQueue[queueIndex].run();
              }
          }
          queueIndex = -1;
          len = queue.length;
      }
      currentQueue = null;
      draining = false;
      runClearTimeout(timeout);
  }
  
  process.nextTick = function (fun) {
      var args = new Array(arguments.length - 1);
      if (arguments.length > 1) {
          for (var i = 1; i < arguments.length; i++) {
              args[i - 1] = arguments[i];
          }
      }
      queue.push(new Item(fun, args));
      if (queue.length === 1 && !draining) {
          runTimeout(drainQueue);
      }
  };
  
  // v8 likes predictible objects
  function Item(fun, array) {
      this.fun = fun;
      this.array = array;
  }
  Item.prototype.run = function () {
      this.fun.apply(null, this.array);
  };
  process.title = 'browser';
  process.browser = true;
  process.env = {};
  process.argv = [];
  process.version = ''; // empty string to avoid regexp issues
  process.versions = {};
  
  function noop() {}
  
  process.on = noop;
  process.addListener = noop;
  process.once = noop;
  process.off = noop;
  process.removeListener = noop;
  process.removeAllListeners = noop;
  process.emit = noop;
  process.prependListener = noop;
  process.prependOnceListener = noop;
  
  process.listeners = function (name) { return [] }
  
  process.binding = function (name) {
      throw new Error('process.binding is not supported');
  };
  
  process.cwd = function () { return '/' };
  process.chdir = function (dir) {
      throw new Error('process.chdir is not supported');
  };
  process.umask = function() { return 0; };
  
  },{}],78:[function(require,module,exports){
  var grammar = module.exports = {
    v: [{
      name: 'version',
      reg: /^(\d*)$/
    }],
    o: [{
      // o=- 20518 0 IN IP4 203.0.113.1
      // NB: sessionId will be a String in most cases because it is huge
      name: 'origin',
      reg: /^(\S*) (\d*) (\d*) (\S*) IP(\d) (\S*)/,
      names: ['username', 'sessionId', 'sessionVersion', 'netType', 'ipVer', 'address'],
      format: '%s %s %d %s IP%d %s'
    }],
    // default parsing of these only (though some of these feel outdated)
    s: [{ name: 'name' }],
    i: [{ name: 'description' }],
    u: [{ name: 'uri' }],
    e: [{ name: 'email' }],
    p: [{ name: 'phone' }],
    z: [{ name: 'timezones' }], // TODO: this one can actually be parsed properly...
    r: [{ name: 'repeats' }],   // TODO: this one can also be parsed properly
    // k: [{}], // outdated thing ignored
    t: [{
      // t=0 0
      name: 'timing',
      reg: /^(\d*) (\d*)/,
      names: ['start', 'stop'],
      format: '%d %d'
    }],
    c: [{
      // c=IN IP4 10.47.197.26
      name: 'connection',
      reg: /^IN IP(\d) (\S*)/,
      names: ['version', 'ip'],
      format: 'IN IP%d %s'
    }],
    b: [{
      // b=AS:4000
      push: 'bandwidth',
      reg: /^(TIAS|AS|CT|RR|RS):(\d*)/,
      names: ['type', 'limit'],
      format: '%s:%s'
    }],
    m: [{
      // m=video 51744 RTP/AVP 126 97 98 34 31
      // NB: special - pushes to session
      // TODO: rtp/fmtp should be filtered by the payloads found here?
      reg: /^(\w*) (\d*) ([\w/]*)(?: (.*))?/,
      names: ['type', 'port', 'protocol', 'payloads'],
      format: '%s %d %s %s'
    }],
    a: [
      {
        // a=rtpmap:110 opus/48000/2
        push: 'rtp',
        reg: /^rtpmap:(\d*) ([\w\-.]*)(?:\s*\/(\d*)(?:\s*\/(\S*))?)?/,
        names: ['payload', 'codec', 'rate', 'encoding'],
        format: function (o) {
          return (o.encoding)
            ? 'rtpmap:%d %s/%s/%s'
            : o.rate
              ? 'rtpmap:%d %s/%s'
              : 'rtpmap:%d %s';
        }
      },
      {
        // a=fmtp:108 profile-level-id=24;object=23;bitrate=64000
        // a=fmtp:111 minptime=10; useinbandfec=1
        push: 'fmtp',
        reg: /^fmtp:(\d*) ([\S| ]*)/,
        names: ['payload', 'config'],
        format: 'fmtp:%d %s'
      },
      {
        // a=control:streamid=0
        name: 'control',
        reg: /^control:(.*)/,
        format: 'control:%s'
      },
      {
        // a=rtcp:65179 IN IP4 193.84.77.194
        name: 'rtcp',
        reg: /^rtcp:(\d*)(?: (\S*) IP(\d) (\S*))?/,
        names: ['port', 'netType', 'ipVer', 'address'],
        format: function (o) {
          return (o.address != null)
            ? 'rtcp:%d %s IP%d %s'
            : 'rtcp:%d';
        }
      },
      {
        // a=rtcp-fb:98 trr-int 100
        push: 'rtcpFbTrrInt',
        reg: /^rtcp-fb:(\*|\d*) trr-int (\d*)/,
        names: ['payload', 'value'],
        format: 'rtcp-fb:%s trr-int %d'
      },
      {
        // a=rtcp-fb:98 nack rpsi
        push: 'rtcpFb',
        reg: /^rtcp-fb:(\*|\d*) ([\w-_]*)(?: ([\w-_]*))?/,
        names: ['payload', 'type', 'subtype'],
        format: function (o) {
          return (o.subtype != null)
            ? 'rtcp-fb:%s %s %s'
            : 'rtcp-fb:%s %s';
        }
      },
      {
        // a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
        // a=extmap:1/recvonly URI-gps-string
        // a=extmap:3 urn:ietf:params:rtp-hdrext:encrypt urn:ietf:params:rtp-hdrext:smpte-tc 25@600/24
        push: 'ext',
        reg: /^extmap:(\d+)(?:\/(\w+))?(?: (urn:ietf:params:rtp-hdrext:encrypt))? (\S*)(?: (\S*))?/,
        names: ['value', 'direction', 'encrypt-uri', 'uri', 'config'],
        format: function (o) {
          return (
            'extmap:%d' +
            (o.direction ? '/%s' : '%v') +
            (o['encrypt-uri'] ? ' %s' : '%v') +
            ' %s' +
            (o.config ? ' %s' : '')
          );
        }
      },
      {
        // a=extmap-allow-mixed
        name: 'extmapAllowMixed',
        reg: /^(extmap-allow-mixed)/
      },
      {
        // a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:PS1uQCVeeCFCanVmcjkpPywjNWhcYD0mXXtxaVBR|2^20|1:32
        push: 'crypto',
        reg: /^crypto:(\d*) ([\w_]*) (\S*)(?: (\S*))?/,
        names: ['id', 'suite', 'config', 'sessionConfig'],
        format: function (o) {
          return (o.sessionConfig != null)
            ? 'crypto:%d %s %s %s'
            : 'crypto:%d %s %s';
        }
      },
      {
        // a=setup:actpass
        name: 'setup',
        reg: /^setup:(\w*)/,
        format: 'setup:%s'
      },
      {
        // a=connection:new
        name: 'connectionType',
        reg: /^connection:(new|existing)/,
        format: 'connection:%s'
      },
      {
        // a=mid:1
        name: 'mid',
        reg: /^mid:([^\s]*)/,
        format: 'mid:%s'
      },
      {
        // a=msid:0c8b064d-d807-43b4-b434-f92a889d8587 98178685-d409-46e0-8e16-7ef0db0db64a
        name: 'msid',
        reg: /^msid:(.*)/,
        format: 'msid:%s'
      },
      {
        // a=ptime:20
        name: 'ptime',
        reg: /^ptime:(\d*(?:\.\d*)*)/,
        format: 'ptime:%d'
      },
      {
        // a=maxptime:60
        name: 'maxptime',
        reg: /^maxptime:(\d*(?:\.\d*)*)/,
        format: 'maxptime:%d'
      },
      {
        // a=sendrecv
        name: 'direction',
        reg: /^(sendrecv|recvonly|sendonly|inactive)/
      },
      {
        // a=ice-lite
        name: 'icelite',
        reg: /^(ice-lite)/
      },
      {
        // a=ice-ufrag:F7gI
        name: 'iceUfrag',
        reg: /^ice-ufrag:(\S*)/,
        format: 'ice-ufrag:%s'
      },
      {
        // a=ice-pwd:x9cml/YzichV2+XlhiMu8g
        name: 'icePwd',
        reg: /^ice-pwd:(\S*)/,
        format: 'ice-pwd:%s'
      },
      {
        // a=fingerprint:SHA-1 00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF:00:11:22:33
        name: 'fingerprint',
        reg: /^fingerprint:(\S*) (\S*)/,
        names: ['type', 'hash'],
        format: 'fingerprint:%s %s'
      },
      {
        // a=candidate:0 1 UDP 2113667327 203.0.113.1 54400 typ host
        // a=candidate:1162875081 1 udp 2113937151 192.168.34.75 60017 typ host generation 0 network-id 3 network-cost 10
        // a=candidate:3289912957 2 udp 1845501695 193.84.77.194 60017 typ srflx raddr 192.168.34.75 rport 60017 generation 0 network-id 3 network-cost 10
        // a=candidate:229815620 1 tcp 1518280447 192.168.150.19 60017 typ host tcptype active generation 0 network-id 3 network-cost 10
        // a=candidate:3289912957 2 tcp 1845501695 193.84.77.194 60017 typ srflx raddr 192.168.34.75 rport 60017 tcptype passive generation 0 network-id 3 network-cost 10
        push:'candidates',
        reg: /^candidate:(\S*) (\d*) (\S*) (\d*) (\S*) (\d*) typ (\S*)(?: raddr (\S*) rport (\d*))?(?: tcptype (\S*))?(?: generation (\d*))?(?: network-id (\d*))?(?: network-cost (\d*))?/,
        names: ['foundation', 'component', 'transport', 'priority', 'ip', 'port', 'type', 'raddr', 'rport', 'tcptype', 'generation', 'network-id', 'network-cost'],
        format: function (o) {
          var str = 'candidate:%s %d %s %d %s %d typ %s';
  
          str += (o.raddr != null) ? ' raddr %s rport %d' : '%v%v';
  
          // NB: candidate has three optional chunks, so %void middles one if it's missing
          str += (o.tcptype != null) ? ' tcptype %s' : '%v';
  
          if (o.generation != null) {
            str += ' generation %d';
          }
  
          str += (o['network-id'] != null) ? ' network-id %d' : '%v';
          str += (o['network-cost'] != null) ? ' network-cost %d' : '%v';
          return str;
        }
      },
      {
        // a=end-of-candidates (keep after the candidates line for readability)
        name: 'endOfCandidates',
        reg: /^(end-of-candidates)/
      },
      {
        // a=remote-candidates:1 203.0.113.1 54400 2 203.0.113.1 54401 ...
        name: 'remoteCandidates',
        reg: /^remote-candidates:(.*)/,
        format: 'remote-candidates:%s'
      },
      {
        // a=ice-options:google-ice
        name: 'iceOptions',
        reg: /^ice-options:(\S*)/,
        format: 'ice-options:%s'
      },
      {
        // a=ssrc:2566107569 cname:t9YU8M1UxTF8Y1A1
        push: 'ssrcs',
        reg: /^ssrc:(\d*) ([\w_-]*)(?::(.*))?/,
        names: ['id', 'attribute', 'value'],
        format: function (o) {
          var str = 'ssrc:%d';
          if (o.attribute != null) {
            str += ' %s';
            if (o.value != null) {
              str += ':%s';
            }
          }
          return str;
        }
      },
      {
        // a=ssrc-group:FEC 1 2
        // a=ssrc-group:FEC-FR 3004364195 1080772241
        push: 'ssrcGroups',
        // token-char = %x21 / %x23-27 / %x2A-2B / %x2D-2E / %x30-39 / %x41-5A / %x5E-7E
        reg: /^ssrc-group:([\x21\x23\x24\x25\x26\x27\x2A\x2B\x2D\x2E\w]*) (.*)/,
        names: ['semantics', 'ssrcs'],
        format: 'ssrc-group:%s %s'
      },
      {
        // a=msid-semantic: WMS Jvlam5X3SX1OP6pn20zWogvaKJz5Hjf9OnlV
        name: 'msidSemantic',
        reg: /^msid-semantic:\s?(\w*) (\S*)/,
        names: ['semantic', 'token'],
        format: 'msid-semantic: %s %s' // space after ':' is not accidental
      },
      {
        // a=group:BUNDLE audio video
        push: 'groups',
        reg: /^group:(\w*) (.*)/,
        names: ['type', 'mids'],
        format: 'group:%s %s'
      },
      {
        // a=rtcp-mux
        name: 'rtcpMux',
        reg: /^(rtcp-mux)/
      },
      {
        // a=rtcp-rsize
        name: 'rtcpRsize',
        reg: /^(rtcp-rsize)/
      },
      {
        // a=sctpmap:5000 webrtc-datachannel 1024
        name: 'sctpmap',
        reg: /^sctpmap:([\w_/]*) (\S*)(?: (\S*))?/,
        names: ['sctpmapNumber', 'app', 'maxMessageSize'],
        format: function (o) {
          return (o.maxMessageSize != null)
            ? 'sctpmap:%s %s %s'
            : 'sctpmap:%s %s';
        }
      },
      {
        // a=x-google-flag:conference
        name: 'xGoogleFlag',
        reg: /^x-google-flag:([^\s]*)/,
        format: 'x-google-flag:%s'
      },
      {
        // a=rid:1 send max-width=1280;max-height=720;max-fps=30;depend=0
        push: 'rids',
        reg: /^rid:([\d\w]+) (\w+)(?: ([\S| ]*))?/,
        names: ['id', 'direction', 'params'],
        format: function (o) {
          return (o.params) ? 'rid:%s %s %s' : 'rid:%s %s';
        }
      },
      {
        // a=imageattr:97 send [x=800,y=640,sar=1.1,q=0.6] [x=480,y=320] recv [x=330,y=250]
        // a=imageattr:* send [x=800,y=640] recv *
        // a=imageattr:100 recv [x=320,y=240]
        push: 'imageattrs',
        reg: new RegExp(
          // a=imageattr:97
          '^imageattr:(\\d+|\\*)' +
          // send [x=800,y=640,sar=1.1,q=0.6] [x=480,y=320]
          '[\\s\\t]+(send|recv)[\\s\\t]+(\\*|\\[\\S+\\](?:[\\s\\t]+\\[\\S+\\])*)' +
          // recv [x=330,y=250]
          '(?:[\\s\\t]+(recv|send)[\\s\\t]+(\\*|\\[\\S+\\](?:[\\s\\t]+\\[\\S+\\])*))?'
        ),
        names: ['pt', 'dir1', 'attrs1', 'dir2', 'attrs2'],
        format: function (o) {
          return 'imageattr:%s %s %s' + (o.dir2 ? ' %s %s' : '');
        }
      },
      {
        // a=simulcast:send 1,2,3;~4,~5 recv 6;~7,~8
        // a=simulcast:recv 1;4,5 send 6;7
        name: 'simulcast',
        reg: new RegExp(
          // a=simulcast:
          '^simulcast:' +
          // send 1,2,3;~4,~5
          '(send|recv) ([a-zA-Z0-9\\-_~;,]+)' +
          // space + recv 6;~7,~8
          '(?:\\s?(send|recv) ([a-zA-Z0-9\\-_~;,]+))?' +
          // end
          '$'
        ),
        names: ['dir1', 'list1', 'dir2', 'list2'],
        format: function (o) {
          return 'simulcast:%s %s' + (o.dir2 ? ' %s %s' : '');
        }
      },
      {
        // old simulcast draft 03 (implemented by Firefox)
        //   https://tools.ietf.org/html/draft-ietf-mmusic-sdp-simulcast-03
        // a=simulcast: recv pt=97;98 send pt=97
        // a=simulcast: send rid=5;6;7 paused=6,7
        name: 'simulcast_03',
        reg: /^simulcast:[\s\t]+([\S+\s\t]+)$/,
        names: ['value'],
        format: 'simulcast: %s'
      },
      {
        // a=framerate:25
        // a=framerate:29.97
        name: 'framerate',
        reg: /^framerate:(\d+(?:$|\.\d+))/,
        format: 'framerate:%s'
      },
      {
        // RFC4570
        // a=source-filter: incl IN IP4 239.5.2.31 10.1.15.5
        name: 'sourceFilter',
        reg: /^source-filter: *(excl|incl) (\S*) (IP4|IP6|\*) (\S*) (.*)/,
        names: ['filterMode', 'netType', 'addressTypes', 'destAddress', 'srcList'],
        format: 'source-filter: %s %s %s %s %s'
      },
      {
        // a=bundle-only
        name: 'bundleOnly',
        reg: /^(bundle-only)/
      },
      {
        // a=label:1
        name: 'label',
        reg: /^label:(.+)/,
        format: 'label:%s'
      },
      {
        // RFC version 26 for SCTP over DTLS
        // https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-26#section-5
        name: 'sctpPort',
        reg: /^sctp-port:(\d+)$/,
        format: 'sctp-port:%s'
      },
      {
        // RFC version 26 for SCTP over DTLS
        // https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-26#section-6
        name: 'maxMessageSize',
        reg: /^max-message-size:(\d+)$/,
        format: 'max-message-size:%s'
      },
      {
        // RFC7273
        // a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:37
        push:'tsRefClocks',
        reg: /^ts-refclk:([^\s=]*)(?:=(\S*))?/,
        names: ['clksrc', 'clksrcExt'],
        format: function (o) {
          return 'ts-refclk:%s' + (o.clksrcExt != null ? '=%s' : '');
        }
      },
      {
        // RFC7273
        // a=mediaclk:direct=963214424
        name:'mediaClk',
        reg: /^mediaclk:(?:id=(\S*))? *([^\s=]*)(?:=(\S*))?(?: *rate=(\d+)\/(\d+))?/,
        names: ['id', 'mediaClockName', 'mediaClockValue', 'rateNumerator', 'rateDenominator'],
        format: function (o) {
          var str = 'mediaclk:';
          str += (o.id != null ? 'id=%s %s' : '%v%s');
          str += (o.mediaClockValue != null ? '=%s' : '');
          str += (o.rateNumerator != null ? ' rate=%s' : '');
          str += (o.rateDenominator != null ? '/%s' : '');
          return str;
        }
      },
      {
        // a=keywds:keywords
        name: 'keywords',
        reg: /^keywds:(.+)$/,
        format: 'keywds:%s'
      },
      {
        // a=content:main
        name: 'content',
        reg: /^content:(.+)/,
        format: 'content:%s'
      },
      // BFCP https://tools.ietf.org/html/rfc4583
      {
        // a=floorctrl:c-s
        name: 'bfcpFloorCtrl',
        reg: /^floorctrl:(c-only|s-only|c-s)/,
        format: 'floorctrl:%s'
      },
      {
        // a=confid:1
        name: 'bfcpConfId',
        reg: /^confid:(\d+)/,
        format: 'confid:%s'
      },
      {
        // a=userid:1
        name: 'bfcpUserId',
        reg: /^userid:(\d+)/,
        format: 'userid:%s'
      },
      {
        // a=floorid:1
        name: 'bfcpFloorId',
        reg: /^floorid:(.+) (?:m-stream|mstrm):(.+)/,
        names: ['id', 'mStream'],
        format: 'floorid:%s mstrm:%s'
      },
      {
        // any a= that we don't understand is kept verbatim on media.invalid
        push: 'invalid',
        names: ['value']
      }
    ]
  };
  
  // set sensible defaults to avoid polluting the grammar with boring details
  Object.keys(grammar).forEach(function (key) {
    var objs = grammar[key];
    objs.forEach(function (obj) {
      if (!obj.reg) {
        obj.reg = /(.*)/;
      }
      if (!obj.format) {
        obj.format = '%s';
      }
    });
  });
  
  },{}],79:[function(require,module,exports){
  var parser = require('./parser');
  var writer = require('./writer');
  
  exports.write = writer;
  exports.parse = parser.parse;
  exports.parseParams = parser.parseParams;
  exports.parseFmtpConfig = parser.parseFmtpConfig; // Alias of parseParams().
  exports.parsePayloads = parser.parsePayloads;
  exports.parseRemoteCandidates = parser.parseRemoteCandidates;
  exports.parseImageAttributes = parser.parseImageAttributes;
  exports.parseSimulcastStreamList = parser.parseSimulcastStreamList;
  
  },{"./parser":80,"./writer":81}],80:[function(require,module,exports){
  var toIntIfInt = function (v) {
    return String(Number(v)) === v ? Number(v) : v;
  };
  
  var attachProperties = function (match, location, names, rawName) {
    if (rawName && !names) {
      location[rawName] = toIntIfInt(match[1]);
    }
    else {
      for (var i = 0; i < names.length; i += 1) {
        if (match[i+1] != null) {
          location[names[i]] = toIntIfInt(match[i+1]);
        }
      }
    }
  };
  
  var parseReg = function (obj, location, content) {
    var needsBlank = obj.name && obj.names;
    if (obj.push && !location[obj.push]) {
      location[obj.push] = [];
    }
    else if (needsBlank && !location[obj.name]) {
      location[obj.name] = {};
    }
    var keyLocation = obj.push ?
      {} :  // blank object that will be pushed
      needsBlank ? location[obj.name] : location; // otherwise, named location or root
  
    attachProperties(content.match(obj.reg), keyLocation, obj.names, obj.name);
  
    if (obj.push) {
      location[obj.push].push(keyLocation);
    }
  };
  
  var grammar = require('./grammar');
  var validLine = RegExp.prototype.test.bind(/^([a-z])=(.*)/);
  
  exports.parse = function (sdp) {
    var session = {}
      , media = []
      , location = session; // points at where properties go under (one of the above)
  
    // parse lines we understand
    sdp.split(/(\r\n|\r|\n)/).filter(validLine).forEach(function (l) {
      var type = l[0];
      var content = l.slice(2);
      if (type === 'm') {
        media.push({rtp: [], fmtp: []});
        location = media[media.length-1]; // point at latest media line
      }
  
      for (var j = 0; j < (grammar[type] || []).length; j += 1) {
        var obj = grammar[type][j];
        if (obj.reg.test(content)) {
          return parseReg(obj, location, content);
        }
      }
    });
  
    session.media = media; // link it up
    return session;
  };
  
  var paramReducer = function (acc, expr) {
    var s = expr.split(/=(.+)/, 2);
    if (s.length === 2) {
      acc[s[0]] = toIntIfInt(s[1]);
    } else if (s.length === 1 && expr.length > 1) {
      acc[s[0]] = undefined;
    }
    return acc;
  };
  
  exports.parseParams = function (str) {
    return str.split(/;\s?/).reduce(paramReducer, {});
  };
  
  // For backward compatibility - alias will be removed in 3.0.0
  exports.parseFmtpConfig = exports.parseParams;
  
  exports.parsePayloads = function (str) {
    return str.toString().split(' ').map(Number);
  };
  
  exports.parseRemoteCandidates = function (str) {
    var candidates = [];
    var parts = str.split(' ').map(toIntIfInt);
    for (var i = 0; i < parts.length; i += 3) {
      candidates.push({
        component: parts[i],
        ip: parts[i + 1],
        port: parts[i + 2]
      });
    }
    return candidates;
  };
  
  exports.parseImageAttributes = function (str) {
    return str.split(' ').map(function (item) {
      return item.substring(1, item.length-1).split(',').reduce(paramReducer, {});
    });
  };
  
  exports.parseSimulcastStreamList = function (str) {
    return str.split(';').map(function (stream) {
      return stream.split(',').map(function (format) {
        var scid, paused = false;
  
        if (format[0] !== '~') {
          scid = toIntIfInt(format);
        } else {
          scid = toIntIfInt(format.substring(1, format.length));
          paused = true;
        }
  
        return {
          scid: scid,
          paused: paused
        };
      });
    });
  };
  
  },{"./grammar":78}],81:[function(require,module,exports){
  var grammar = require('./grammar');
  
  // customized util.format - discards excess arguments and can void middle ones
  var formatRegExp = /%[sdv%]/g;
  var format = function (formatStr) {
    var i = 1;
    var args = arguments;
    var len = args.length;
    return formatStr.replace(formatRegExp, function (x) {
      if (i >= len) {
        return x; // missing argument
      }
      var arg = args[i];
      i += 1;
      switch (x) {
      case '%%':
        return '%';
      case '%s':
        return String(arg);
      case '%d':
        return Number(arg);
      case '%v':
        return '';
      }
    });
    // NB: we discard excess arguments - they are typically undefined from makeLine
  };
  
  var makeLine = function (type, obj, location) {
    var str = obj.format instanceof Function ?
      (obj.format(obj.push ? location : location[obj.name])) :
      obj.format;
  
    var args = [type + '=' + str];
    if (obj.names) {
      for (var i = 0; i < obj.names.length; i += 1) {
        var n = obj.names[i];
        if (obj.name) {
          args.push(location[obj.name][n]);
        }
        else { // for mLine and push attributes
          args.push(location[obj.names[i]]);
        }
      }
    }
    else {
      args.push(location[obj.name]);
    }
    return format.apply(null, args);
  };
  
  // RFC specified order
  // TODO: extend this with all the rest
  var defaultOuterOrder = [
    'v', 'o', 's', 'i',
    'u', 'e', 'p', 'c',
    'b', 't', 'r', 'z', 'a'
  ];
  var defaultInnerOrder = ['i', 'c', 'b', 'a'];
  
  
  module.exports = function (session, opts) {
    opts = opts || {};
    // ensure certain properties exist
    if (session.version == null) {
      session.version = 0; // 'v=0' must be there (only defined version atm)
    }
    if (session.name == null) {
      session.name = ' '; // 's= ' must be there if no meaningful name set
    }
    session.media.forEach(function (mLine) {
      if (mLine.payloads == null) {
        mLine.payloads = '';
      }
    });
  
    var outerOrder = opts.outerOrder || defaultOuterOrder;
    var innerOrder = opts.innerOrder || defaultInnerOrder;
    var sdp = [];
  
    // loop through outerOrder for matching properties on session
    outerOrder.forEach(function (type) {
      grammar[type].forEach(function (obj) {
        if (obj.name in session && session[obj.name] != null) {
          sdp.push(makeLine(type, obj, session));
        }
        else if (obj.push in session && session[obj.push] != null) {
          session[obj.push].forEach(function (el) {
            sdp.push(makeLine(type, obj, el));
          });
        }
      });
    });
  
    // then for each media line, follow the innerOrder
    session.media.forEach(function (mLine) {
      sdp.push(makeLine('m', grammar.m[0], mLine));
  
      innerOrder.forEach(function (type) {
        grammar[type].forEach(function (obj) {
          if (obj.name in mLine && mLine[obj.name] != null) {
            sdp.push(makeLine(type, obj, mLine));
          }
          else if (obj.push in mLine && mLine[obj.push] != null) {
            mLine[obj.push].forEach(function (el) {
              sdp.push(makeLine(type, obj, el));
            });
          }
        });
      });
    });
  
    return sdp.join('\r\n') + '\r\n';
  };
  
  },{"./grammar":78}],82:[function(require,module,exports){
  
  /**
   * Module dependencies.
   */
  
  var url = require('./url');
  var parser = require('socket.io-parser');
  var Manager = require('./manager');
  var debug = require('debug')('socket.io-client');
  
  /**
   * Module exports.
   */
  
  module.exports = exports = lookup;
  
  /**
   * Managers cache.
   */
  
  var cache = exports.managers = {};
  
  /**
   * Looks up an existing `Manager` for multiplexing.
   * If the user summons:
   *
   *   `io('http://localhost/a');`
   *   `io('http://localhost/b');`
   *
   * We reuse the existing instance based on same scheme/port/host,
   * and we initialize sockets for each namespace.
   *
   * @api public
   */
  
  function lookup (uri, opts) {
    if (typeof uri === 'object') {
      opts = uri;
      uri = undefined;
    }
  
    opts = opts || {};
  
    var parsed = url(uri);
    var source = parsed.source;
    var id = parsed.id;
    var path = parsed.path;
    var sameNamespace = cache[id] && path in cache[id].nsps;
    var newConnection = opts.forceNew || opts['force new connection'] ||
                        false === opts.multiplex || sameNamespace;
  
    var io;
  
    if (newConnection) {
      debug('ignoring socket cache for %s', source);
      io = Manager(source, opts);
    } else {
      if (!cache[id]) {
        debug('new io instance for %s', source);
        cache[id] = Manager(source, opts);
      }
      io = cache[id];
    }
    if (parsed.query && !opts.query) {
      opts.query = parsed.query;
    }
    return io.socket(parsed.path, opts);
  }
  
  /**
   * Protocol version.
   *
   * @api public
   */
  
  exports.protocol = parser.protocol;
  
  /**
   * `connect`.
   *
   * @param {String} uri
   * @api public
   */
  
  exports.connect = lookup;
  
  /**
   * Expose constructors for standalone build.
   *
   * @api public
   */
  
  exports.Manager = require('./manager');
  exports.Socket = require('./socket');
  
  },{"./manager":83,"./socket":85,"./url":86,"debug":87,"socket.io-parser":90}],83:[function(require,module,exports){
  
  /**
   * Module dependencies.
   */
  
  var eio = require('engine.io-client');
  var Socket = require('./socket');
  var Emitter = require('component-emitter');
  var parser = require('socket.io-parser');
  var on = require('./on');
  var bind = require('component-bind');
  var debug = require('debug')('socket.io-client:manager');
  var indexOf = require('indexof');
  var Backoff = require('backo2');
  
  /**
   * IE6+ hasOwnProperty
   */
  
  var has = Object.prototype.hasOwnProperty;
  
  /**
   * Module exports
   */
  
  module.exports = Manager;
  
  /**
   * `Manager` constructor.
   *
   * @param {String} engine instance or engine uri/opts
   * @param {Object} options
   * @api public
   */
  
  function Manager (uri, opts) {
    if (!(this instanceof Manager)) return new Manager(uri, opts);
    if (uri && ('object' === typeof uri)) {
      opts = uri;
      uri = undefined;
    }
    opts = opts || {};
  
    opts.path = opts.path || '/socket.io';
    this.nsps = {};
    this.subs = [];
    this.opts = opts;
    this.reconnection(opts.reconnection !== false);
    this.reconnectionAttempts(opts.reconnectionAttempts || Infinity);
    this.reconnectionDelay(opts.reconnectionDelay || 1000);
    this.reconnectionDelayMax(opts.reconnectionDelayMax || 5000);
    this.randomizationFactor(opts.randomizationFactor || 0.5);
    this.backoff = new Backoff({
      min: this.reconnectionDelay(),
      max: this.reconnectionDelayMax(),
      jitter: this.randomizationFactor()
    });
    this.timeout(null == opts.timeout ? 20000 : opts.timeout);
    this.readyState = 'closed';
    this.uri = uri;
    this.connecting = [];
    this.lastPing = null;
    this.encoding = false;
    this.packetBuffer = [];
    var _parser = opts.parser || parser;
    this.encoder = new _parser.Encoder();
    this.decoder = new _parser.Decoder();
    this.autoConnect = opts.autoConnect !== false;
    if (this.autoConnect) this.open();
  }
  
  /**
   * Propagate given event to sockets and emit on `this`
   *
   * @api private
   */
  
  Manager.prototype.emitAll = function () {
    this.emit.apply(this, arguments);
    for (var nsp in this.nsps) {
      if (has.call(this.nsps, nsp)) {
        this.nsps[nsp].emit.apply(this.nsps[nsp], arguments);
      }
    }
  };
  
  /**
   * Update `socket.id` of all sockets
   *
   * @api private
   */
  
  Manager.prototype.updateSocketIds = function () {
    for (var nsp in this.nsps) {
      if (has.call(this.nsps, nsp)) {
        this.nsps[nsp].id = this.generateId(nsp);
      }
    }
  };
  
  /**
   * generate `socket.id` for the given `nsp`
   *
   * @param {String} nsp
   * @return {String}
   * @api private
   */
  
  Manager.prototype.generateId = function (nsp) {
    return (nsp === '/' ? '' : (nsp + '#')) + this.engine.id;
  };
  
  /**
   * Mix in `Emitter`.
   */
  
  Emitter(Manager.prototype);
  
  /**
   * Sets the `reconnection` config.
   *
   * @param {Boolean} true/false if it should automatically reconnect
   * @return {Manager} self or value
   * @api public
   */
  
  Manager.prototype.reconnection = function (v) {
    if (!arguments.length) return this._reconnection;
    this._reconnection = !!v;
    return this;
  };
  
  /**
   * Sets the reconnection attempts config.
   *
   * @param {Number} max reconnection attempts before giving up
   * @return {Manager} self or value
   * @api public
   */
  
  Manager.prototype.reconnectionAttempts = function (v) {
    if (!arguments.length) return this._reconnectionAttempts;
    this._reconnectionAttempts = v;
    return this;
  };
  
  /**
   * Sets the delay between reconnections.
   *
   * @param {Number} delay
   * @return {Manager} self or value
   * @api public
   */
  
  Manager.prototype.reconnectionDelay = function (v) {
    if (!arguments.length) return this._reconnectionDelay;
    this._reconnectionDelay = v;
    this.backoff && this.backoff.setMin(v);
    return this;
  };
  
  Manager.prototype.randomizationFactor = function (v) {
    if (!arguments.length) return this._randomizationFactor;
    this._randomizationFactor = v;
    this.backoff && this.backoff.setJitter(v);
    return this;
  };
  
  /**
   * Sets the maximum delay between reconnections.
   *
   * @param {Number} delay
   * @return {Manager} self or value
   * @api public
   */
  
  Manager.prototype.reconnectionDelayMax = function (v) {
    if (!arguments.length) return this._reconnectionDelayMax;
    this._reconnectionDelayMax = v;
    this.backoff && this.backoff.setMax(v);
    return this;
  };
  
  /**
   * Sets the connection timeout. `false` to disable
   *
   * @return {Manager} self or value
   * @api public
   */
  
  Manager.prototype.timeout = function (v) {
    if (!arguments.length) return this._timeout;
    this._timeout = v;
    return this;
  };
  
  /**
   * Starts trying to reconnect if reconnection is enabled and we have not
   * started reconnecting yet
   *
   * @api private
   */
  
  Manager.prototype.maybeReconnectOnOpen = function () {
    // Only try to reconnect if it's the first time we're connecting
    if (!this.reconnecting && this._reconnection && this.backoff.attempts === 0) {
      // keeps reconnection from firing twice for the same reconnection loop
      this.reconnect();
    }
  };
  
  /**
   * Sets the current transport `socket`.
   *
   * @param {Function} optional, callback
   * @return {Manager} self
   * @api public
   */
  
  Manager.prototype.open =
  Manager.prototype.connect = function (fn, opts) {
    debug('readyState %s', this.readyState);
    if (~this.readyState.indexOf('open')) return this;
  
    debug('opening %s', this.uri);
    this.engine = eio(this.uri, this.opts);
    var socket = this.engine;
    var self = this;
    this.readyState = 'opening';
    this.skipReconnect = false;
  
    // emit `open`
    var openSub = on(socket, 'open', function () {
      self.onopen();
      fn && fn();
    });
  
    // emit `connect_error`
    var errorSub = on(socket, 'error', function (data) {
      debug('connect_error');
      self.cleanup();
      self.readyState = 'closed';
      self.emitAll('connect_error', data);
      if (fn) {
        var err = new Error('Connection error');
        err.data = data;
        fn(err);
      } else {
        // Only do this if there is no fn to handle the error
        self.maybeReconnectOnOpen();
      }
    });
  
    // emit `connect_timeout`
    if (false !== this._timeout) {
      var timeout = this._timeout;
      debug('connect attempt will timeout after %d', timeout);
  
      if (timeout === 0) {
        openSub.destroy(); // prevents a race condition with the 'open' event
      }
  
      // set timer
      var timer = setTimeout(function () {
        debug('connect attempt timed out after %d', timeout);
        openSub.destroy();
        socket.close();
        socket.emit('error', 'timeout');
        self.emitAll('connect_timeout', timeout);
      }, timeout);
  
      this.subs.push({
        destroy: function () {
          clearTimeout(timer);
        }
      });
    }
  
    this.subs.push(openSub);
    this.subs.push(errorSub);
  
    return this;
  };
  
  /**
   * Called upon transport open.
   *
   * @api private
   */
  
  Manager.prototype.onopen = function () {
    debug('open');
  
    // clear old subs
    this.cleanup();
  
    // mark as open
    this.readyState = 'open';
    this.emit('open');
  
    // add new subs
    var socket = this.engine;
    this.subs.push(on(socket, 'data', bind(this, 'ondata')));
    this.subs.push(on(socket, 'ping', bind(this, 'onping')));
    this.subs.push(on(socket, 'pong', bind(this, 'onpong')));
    this.subs.push(on(socket, 'error', bind(this, 'onerror')));
    this.subs.push(on(socket, 'close', bind(this, 'onclose')));
    this.subs.push(on(this.decoder, 'decoded', bind(this, 'ondecoded')));
  };
  
  /**
   * Called upon a ping.
   *
   * @api private
   */
  
  Manager.prototype.onping = function () {
    this.lastPing = new Date();
    this.emitAll('ping');
  };
  
  /**
   * Called upon a packet.
   *
   * @api private
   */
  
  Manager.prototype.onpong = function () {
    this.emitAll('pong', new Date() - this.lastPing);
  };
  
  /**
   * Called with data.
   *
   * @api private
   */
  
  Manager.prototype.ondata = function (data) {
    this.decoder.add(data);
  };
  
  /**
   * Called when parser fully decodes a packet.
   *
   * @api private
   */
  
  Manager.prototype.ondecoded = function (packet) {
    this.emit('packet', packet);
  };
  
  /**
   * Called upon socket error.
   *
   * @api private
   */
  
  Manager.prototype.onerror = function (err) {
    debug('error', err);
    this.emitAll('error', err);
  };
  
  /**
   * Creates a new socket for the given `nsp`.
   *
   * @return {Socket}
   * @api public
   */
  
  Manager.prototype.socket = function (nsp, opts) {
    var socket = this.nsps[nsp];
    if (!socket) {
      socket = new Socket(this, nsp, opts);
      this.nsps[nsp] = socket;
      var self = this;
      socket.on('connecting', onConnecting);
      socket.on('connect', function () {
        socket.id = self.generateId(nsp);
      });
  
      if (this.autoConnect) {
        // manually call here since connecting event is fired before listening
        onConnecting();
      }
    }
  
    function onConnecting () {
      if (!~indexOf(self.connecting, socket)) {
        self.connecting.push(socket);
      }
    }
  
    return socket;
  };
  
  /**
   * Called upon a socket close.
   *
   * @param {Socket} socket
   */
  
  Manager.prototype.destroy = function (socket) {
    var index = indexOf(this.connecting, socket);
    if (~index) this.connecting.splice(index, 1);
    if (this.connecting.length) return;
  
    this.close();
  };
  
  /**
   * Writes a packet.
   *
   * @param {Object} packet
   * @api private
   */
  
  Manager.prototype.packet = function (packet) {
    debug('writing packet %j', packet);
    var self = this;
    if (packet.query && packet.type === 0) packet.nsp += '?' + packet.query;
  
    if (!self.encoding) {
      // encode, then write to engine with result
      self.encoding = true;
      this.encoder.encode(packet, function (encodedPackets) {
        for (var i = 0; i < encodedPackets.length; i++) {
          self.engine.write(encodedPackets[i], packet.options);
        }
        self.encoding = false;
        self.processPacketQueue();
      });
    } else { // add packet to the queue
      self.packetBuffer.push(packet);
    }
  };
  
  /**
   * If packet buffer is non-empty, begins encoding the
   * next packet in line.
   *
   * @api private
   */
  
  Manager.prototype.processPacketQueue = function () {
    if (this.packetBuffer.length > 0 && !this.encoding) {
      var pack = this.packetBuffer.shift();
      this.packet(pack);
    }
  };
  
  /**
   * Clean up transport subscriptions and packet buffer.
   *
   * @api private
   */
  
  Manager.prototype.cleanup = function () {
    debug('cleanup');
  
    var subsLength = this.subs.length;
    for (var i = 0; i < subsLength; i++) {
      var sub = this.subs.shift();
      sub.destroy();
    }
  
    this.packetBuffer = [];
    this.encoding = false;
    this.lastPing = null;
  
    this.decoder.destroy();
  };
  
  /**
   * Close the current socket.
   *
   * @api private
   */
  
  Manager.prototype.close =
  Manager.prototype.disconnect = function () {
    debug('disconnect');
    this.skipReconnect = true;
    this.reconnecting = false;
    if ('opening' === this.readyState) {
      // `onclose` will not fire because
      // an open event never happened
      this.cleanup();
    }
    this.backoff.reset();
    this.readyState = 'closed';
    if (this.engine) this.engine.close();
  };
  
  /**
   * Called upon engine close.
   *
   * @api private
   */
  
  Manager.prototype.onclose = function (reason) {
    debug('onclose');
  
    this.cleanup();
    this.backoff.reset();
    this.readyState = 'closed';
    this.emit('close', reason);
  
    if (this._reconnection && !this.skipReconnect) {
      this.reconnect();
    }
  };
  
  /**
   * Attempt a reconnection.
   *
   * @api private
   */
  
  Manager.prototype.reconnect = function () {
    if (this.reconnecting || this.skipReconnect) return this;
  
    var self = this;
  
    if (this.backoff.attempts >= this._reconnectionAttempts) {
      debug('reconnect failed');
      this.backoff.reset();
      this.emitAll('reconnect_failed');
      this.reconnecting = false;
    } else {
      var delay = this.backoff.duration();
      debug('will wait %dms before reconnect attempt', delay);
  
      this.reconnecting = true;
      var timer = setTimeout(function () {
        if (self.skipReconnect) return;
  
        debug('attempting reconnect');
        self.emitAll('reconnect_attempt', self.backoff.attempts);
        self.emitAll('reconnecting', self.backoff.attempts);
  
        // check again for the case socket closed in above events
        if (self.skipReconnect) return;
  
        self.open(function (err) {
          if (err) {
            debug('reconnect attempt error');
            self.reconnecting = false;
            self.reconnect();
            self.emitAll('reconnect_error', err.data);
          } else {
            debug('reconnect success');
            self.onreconnect();
          }
        });
      }, delay);
  
      this.subs.push({
        destroy: function () {
          clearTimeout(timer);
        }
      });
    }
  };
  
  /**
   * Called upon successful reconnect.
   *
   * @api private
   */
  
  Manager.prototype.onreconnect = function () {
    var attempt = this.backoff.attempts;
    this.reconnecting = false;
    this.backoff.reset();
    this.updateSocketIds();
    this.emitAll('reconnect', attempt);
  };
  
  },{"./on":84,"./socket":85,"backo2":4,"component-bind":11,"component-emitter":12,"debug":87,"engine.io-client":15,"indexof":37,"socket.io-parser":90}],84:[function(require,module,exports){
  
  /**
   * Module exports.
   */
  
  module.exports = on;
  
  /**
   * Helper for subscriptions.
   *
   * @param {Object|EventEmitter} obj with `Emitter` mixin or `EventEmitter`
   * @param {String} event name
   * @param {Function} callback
   * @api public
   */
  
  function on (obj, ev, fn) {
    obj.on(ev, fn);
    return {
      destroy: function () {
        obj.removeListener(ev, fn);
      }
    };
  }
  
  },{}],85:[function(require,module,exports){
  
  /**
   * Module dependencies.
   */
  
  var parser = require('socket.io-parser');
  var Emitter = require('component-emitter');
  var toArray = require('to-array');
  var on = require('./on');
  var bind = require('component-bind');
  var debug = require('debug')('socket.io-client:socket');
  var parseqs = require('parseqs');
  var hasBin = require('has-binary2');
  
  /**
   * Module exports.
   */
  
  module.exports = exports = Socket;
  
  /**
   * Internal events (blacklisted).
   * These events can't be emitted by the user.
   *
   * @api private
   */
  
  var events = {
    connect: 1,
    connect_error: 1,
    connect_timeout: 1,
    connecting: 1,
    disconnect: 1,
    error: 1,
    reconnect: 1,
    reconnect_attempt: 1,
    reconnect_failed: 1,
    reconnect_error: 1,
    reconnecting: 1,
    ping: 1,
    pong: 1
  };
  
  /**
   * Shortcut to `Emitter#emit`.
   */
  
  var emit = Emitter.prototype.emit;
  
  /**
   * `Socket` constructor.
   *
   * @api public
   */
  
  function Socket (io, nsp, opts) {
    this.io = io;
    this.nsp = nsp;
    this.json = this; // compat
    this.ids = 0;
    this.acks = {};
    this.receiveBuffer = [];
    this.sendBuffer = [];
    this.connected = false;
    this.disconnected = true;
    this.flags = {};
    if (opts && opts.query) {
      this.query = opts.query;
    }
    if (this.io.autoConnect) this.open();
  }
  
  /**
   * Mix in `Emitter`.
   */
  
  Emitter(Socket.prototype);
  
  /**
   * Subscribe to open, close and packet events
   *
   * @api private
   */
  
  Socket.prototype.subEvents = function () {
    if (this.subs) return;
  
    var io = this.io;
    this.subs = [
      on(io, 'open', bind(this, 'onopen')),
      on(io, 'packet', bind(this, 'onpacket')),
      on(io, 'close', bind(this, 'onclose'))
    ];
  };
  
  /**
   * "Opens" the socket.
   *
   * @api public
   */
  
  Socket.prototype.open =
  Socket.prototype.connect = function () {
    if (this.connected) return this;
  
    this.subEvents();
    if (!this.io.reconnecting) this.io.open(); // ensure open
    if ('open' === this.io.readyState) this.onopen();
    this.emit('connecting');
    return this;
  };
  
  /**
   * Sends a `message` event.
   *
   * @return {Socket} self
   * @api public
   */
  
  Socket.prototype.send = function () {
    var args = toArray(arguments);
    args.unshift('message');
    this.emit.apply(this, args);
    return this;
  };
  
  /**
   * Override `emit`.
   * If the event is in `events`, it's emitted normally.
   *
   * @param {String} event name
   * @return {Socket} self
   * @api public
   */
  
  Socket.prototype.emit = function (ev) {
    if (events.hasOwnProperty(ev)) {
      emit.apply(this, arguments);
      return this;
    }
  
    var args = toArray(arguments);
    var packet = {
      type: (this.flags.binary !== undefined ? this.flags.binary : hasBin(args)) ? parser.BINARY_EVENT : parser.EVENT,
      data: args
    };
  
    packet.options = {};
    packet.options.compress = !this.flags || false !== this.flags.compress;
  
    // event ack callback
    if ('function' === typeof args[args.length - 1]) {
      debug('emitting packet with ack id %d', this.ids);
      this.acks[this.ids] = args.pop();
      packet.id = this.ids++;
    }
  
    if (this.connected) {
      this.packet(packet);
    } else {
      this.sendBuffer.push(packet);
    }
  
    this.flags = {};
  
    return this;
  };
  
  /**
   * Sends a packet.
   *
   * @param {Object} packet
   * @api private
   */
  
  Socket.prototype.packet = function (packet) {
    packet.nsp = this.nsp;
    this.io.packet(packet);
  };
  
  /**
   * Called upon engine `open`.
   *
   * @api private
   */
  
  Socket.prototype.onopen = function () {
    debug('transport is open - connecting');
  
    // write connect packet if necessary
    if ('/' !== this.nsp) {
      if (this.query) {
        var query = typeof this.query === 'object' ? parseqs.encode(this.query) : this.query;
        debug('sending connect packet with query %s', query);
        this.packet({type: parser.CONNECT, query: query});
      } else {
        this.packet({type: parser.CONNECT});
      }
    }
  };
  
  /**
   * Called upon engine `close`.
   *
   * @param {String} reason
   * @api private
   */
  
  Socket.prototype.onclose = function (reason) {
    debug('close (%s)', reason);
    this.connected = false;
    this.disconnected = true;
    delete this.id;
    this.emit('disconnect', reason);
  };
  
  /**
   * Called with socket packet.
   *
   * @param {Object} packet
   * @api private
   */
  
  Socket.prototype.onpacket = function (packet) {
    var sameNamespace = packet.nsp === this.nsp;
    var rootNamespaceError = packet.type === parser.ERROR && packet.nsp === '/';
  
    if (!sameNamespace && !rootNamespaceError) return;
  
    switch (packet.type) {
      case parser.CONNECT:
        this.onconnect();
        break;
  
      case parser.EVENT:
        this.onevent(packet);
        break;
  
      case parser.BINARY_EVENT:
        this.onevent(packet);
        break;
  
      case parser.ACK:
        this.onack(packet);
        break;
  
      case parser.BINARY_ACK:
        this.onack(packet);
        break;
  
      case parser.DISCONNECT:
        this.ondisconnect();
        break;
  
      case parser.ERROR:
        this.emit('error', packet.data);
        break;
    }
  };
  
  /**
   * Called upon a server event.
   *
   * @param {Object} packet
   * @api private
   */
  
  Socket.prototype.onevent = function (packet) {
    var args = packet.data || [];
    debug('emitting event %j', args);
  
    if (null != packet.id) {
      debug('attaching ack callback to event');
      args.push(this.ack(packet.id));
    }
  
    if (this.connected) {
      emit.apply(this, args);
    } else {
      this.receiveBuffer.push(args);
    }
  };
  
  /**
   * Produces an ack callback to emit with an event.
   *
   * @api private
   */
  
  Socket.prototype.ack = function (id) {
    var self = this;
    var sent = false;
    return function () {
      // prevent double callbacks
      if (sent) return;
      sent = true;
      var args = toArray(arguments);
      debug('sending ack %j', args);
  
      self.packet({
        type: hasBin(args) ? parser.BINARY_ACK : parser.ACK,
        id: id,
        data: args
      });
    };
  };
  
  /**
   * Called upon a server acknowlegement.
   *
   * @param {Object} packet
   * @api private
   */
  
  Socket.prototype.onack = function (packet) {
    var ack = this.acks[packet.id];
    if ('function' === typeof ack) {
      debug('calling ack %s with %j', packet.id, packet.data);
      ack.apply(this, packet.data);
      delete this.acks[packet.id];
    } else {
      debug('bad ack %s', packet.id);
    }
  };
  
  /**
   * Called upon server connect.
   *
   * @api private
   */
  
  Socket.prototype.onconnect = function () {
    this.connected = true;
    this.disconnected = false;
    this.emitBuffered();
    this.emit('connect');
  };
  
  /**
   * Emit buffered events (received and emitted).
   *
   * @api private
   */
  
  Socket.prototype.emitBuffered = function () {
    var i;
    for (i = 0; i < this.receiveBuffer.length; i++) {
      emit.apply(this, this.receiveBuffer[i]);
    }
    this.receiveBuffer = [];
  
    for (i = 0; i < this.sendBuffer.length; i++) {
      this.packet(this.sendBuffer[i]);
    }
    this.sendBuffer = [];
  };
  
  /**
   * Called upon server disconnect.
   *
   * @api private
   */
  
  Socket.prototype.ondisconnect = function () {
    debug('server disconnect (%s)', this.nsp);
    this.destroy();
    this.onclose('io server disconnect');
  };
  
  /**
   * Called upon forced client/server side disconnections,
   * this method ensures the manager stops tracking us and
   * that reconnections don't get triggered for this.
   *
   * @api private.
   */
  
  Socket.prototype.destroy = function () {
    if (this.subs) {
      // clean subscriptions to avoid reconnections
      for (var i = 0; i < this.subs.length; i++) {
        this.subs[i].destroy();
      }
      this.subs = null;
    }
  
    this.io.destroy(this);
  };
  
  /**
   * Disconnects the socket manually.
   *
   * @return {Socket} self
   * @api public
   */
  
  Socket.prototype.close =
  Socket.prototype.disconnect = function () {
    if (this.connected) {
      debug('performing disconnect (%s)', this.nsp);
      this.packet({ type: parser.DISCONNECT });
    }
  
    // remove socket from pool
    this.destroy();
  
    if (this.connected) {
      // fire events
      this.onclose('io client disconnect');
    }
    return this;
  };
  
  /**
   * Sets the compress flag.
   *
   * @param {Boolean} if `true`, compresses the sending data
   * @return {Socket} self
   * @api public
   */
  
  Socket.prototype.compress = function (compress) {
    this.flags.compress = compress;
    return this;
  };
  
  /**
   * Sets the binary flag
   *
   * @param {Boolean} whether the emitted data contains binary
   * @return {Socket} self
   * @api public
   */
  
  Socket.prototype.binary = function (binary) {
    this.flags.binary = binary;
    return this;
  };
  
  },{"./on":84,"component-bind":11,"component-emitter":12,"debug":87,"has-binary2":34,"parseqs":75,"socket.io-parser":90,"to-array":92}],86:[function(require,module,exports){
  
  /**
   * Module dependencies.
   */
  
  var parseuri = require('parseuri');
  var debug = require('debug')('socket.io-client:url');
  
  /**
   * Module exports.
   */
  
  module.exports = url;
  
  /**
   * URL parser.
   *
   * @param {String} url
   * @param {Object} An object meant to mimic window.location.
   *                 Defaults to window.location.
   * @api public
   */
  
  function url (uri, loc) {
    var obj = uri;
  
    // default to window.location
    loc = loc || (typeof location !== 'undefined' && location);
    if (null == uri) uri = loc.protocol + '//' + loc.host;
  
    // relative path support
    if ('string' === typeof uri) {
      if ('/' === uri.charAt(0)) {
        if ('/' === uri.charAt(1)) {
          uri = loc.protocol + uri;
        } else {
          uri = loc.host + uri;
        }
      }
  
      if (!/^(https?|wss?):\/\//.test(uri)) {
        debug('protocol-less url %s', uri);
        if ('undefined' !== typeof loc) {
          uri = loc.protocol + '//' + uri;
        } else {
          uri = 'https://' + uri;
        }
      }
  
      // parse
      debug('parse %s', uri);
      obj = parseuri(uri);
    }
  
    // make sure we treat `localhost:80` and `localhost` equally
    if (!obj.port) {
      if (/^(http|ws)$/.test(obj.protocol)) {
        obj.port = '80';
      } else if (/^(http|ws)s$/.test(obj.protocol)) {
        obj.port = '443';
      }
    }
  
    obj.path = obj.path || '/';
  
    var ipv6 = obj.host.indexOf(':') !== -1;
    var host = ipv6 ? '[' + obj.host + ']' : obj.host;
  
    // define unique id
    obj.id = obj.protocol + '://' + host + ':' + obj.port;
    // define href
    obj.href = obj.protocol + '://' + host + (loc && loc.port === obj.port ? '' : (':' + obj.port));
  
    return obj;
  }
  
  },{"debug":87,"parseuri":76}],87:[function(require,module,exports){
  arguments[4][24][0].apply(exports,arguments)
  },{"./debug":88,"_process":77,"dup":24}],88:[function(require,module,exports){
  arguments[4][25][0].apply(exports,arguments)
  },{"dup":25,"ms":74}],89:[function(require,module,exports){
  /*global Blob,File*/
  
  /**
   * Module requirements
   */
  
  var isArray = require('isarray');
  var isBuf = require('./is-buffer');
  var toString = Object.prototype.toString;
  var withNativeBlob = typeof Blob === 'function' || (typeof Blob !== 'undefined' && toString.call(Blob) === '[object BlobConstructor]');
  var withNativeFile = typeof File === 'function' || (typeof File !== 'undefined' && toString.call(File) === '[object FileConstructor]');
  
  /**
   * Replaces every Buffer | ArrayBuffer in packet with a numbered placeholder.
   * Anything with blobs or files should be fed through removeBlobs before coming
   * here.
   *
   * @param {Object} packet - socket.io event packet
   * @return {Object} with deconstructed packet and list of buffers
   * @api public
   */
  
  exports.deconstructPacket = function(packet) {
    var buffers = [];
    var packetData = packet.data;
    var pack = packet;
    pack.data = _deconstructPacket(packetData, buffers);
    pack.attachments = buffers.length; // number of binary 'attachments'
    return {packet: pack, buffers: buffers};
  };
  
  function _deconstructPacket(data, buffers) {
    if (!data) return data;
  
    if (isBuf(data)) {
      var placeholder = { _placeholder: true, num: buffers.length };
      buffers.push(data);
      return placeholder;
    } else if (isArray(data)) {
      var newData = new Array(data.length);
      for (var i = 0; i < data.length; i++) {
        newData[i] = _deconstructPacket(data[i], buffers);
      }
      return newData;
    } else if (typeof data === 'object' && !(data instanceof Date)) {
      var newData = {};
      for (var key in data) {
        newData[key] = _deconstructPacket(data[key], buffers);
      }
      return newData;
    }
    return data;
  }
  
  /**
   * Reconstructs a binary packet from its placeholder packet and buffers
   *
   * @param {Object} packet - event packet with placeholders
   * @param {Array} buffers - binary buffers to put in placeholder positions
   * @return {Object} reconstructed packet
   * @api public
   */
  
  exports.reconstructPacket = function(packet, buffers) {
    packet.data = _reconstructPacket(packet.data, buffers);
    packet.attachments = undefined; // no longer useful
    return packet;
  };
  
  function _reconstructPacket(data, buffers) {
    if (!data) return data;
  
    if (data && data._placeholder) {
      return buffers[data.num]; // appropriate buffer (should be natural order anyway)
    } else if (isArray(data)) {
      for (var i = 0; i < data.length; i++) {
        data[i] = _reconstructPacket(data[i], buffers);
      }
    } else if (typeof data === 'object') {
      for (var key in data) {
        data[key] = _reconstructPacket(data[key], buffers);
      }
    }
  
    return data;
  }
  
  /**
   * Asynchronously removes Blobs or Files from data via
   * FileReader's readAsArrayBuffer method. Used before encoding
   * data as msgpack. Calls callback with the blobless data.
   *
   * @param {Object} data
   * @param {Function} callback
   * @api private
   */
  
  exports.removeBlobs = function(data, callback) {
    function _removeBlobs(obj, curKey, containingObject) {
      if (!obj) return obj;
  
      // convert any blob
      if ((withNativeBlob && obj instanceof Blob) ||
          (withNativeFile && obj instanceof File)) {
        pendingBlobs++;
  
        // async filereader
        var fileReader = new FileReader();
        fileReader.onload = function() { // this.result == arraybuffer
          if (containingObject) {
            containingObject[curKey] = this.result;
          }
          else {
            bloblessData = this.result;
          }
  
          // if nothing pending its callback time
          if(! --pendingBlobs) {
            callback(bloblessData);
          }
        };
  
        fileReader.readAsArrayBuffer(obj); // blob -> arraybuffer
      } else if (isArray(obj)) { // handle array
        for (var i = 0; i < obj.length; i++) {
          _removeBlobs(obj[i], i, obj);
        }
      } else if (typeof obj === 'object' && !isBuf(obj)) { // and object
        for (var key in obj) {
          _removeBlobs(obj[key], key, obj);
        }
      }
    }
  
    var pendingBlobs = 0;
    var bloblessData = data;
    _removeBlobs(bloblessData);
    if (!pendingBlobs) {
      callback(bloblessData);
    }
  };
  
  },{"./is-buffer":91,"isarray":38}],90:[function(require,module,exports){
  
  /**
   * Module dependencies.
   */
  
  var debug = require('debug')('socket.io-parser');
  var Emitter = require('component-emitter');
  var binary = require('./binary');
  var isArray = require('isarray');
  var isBuf = require('./is-buffer');
  
  /**
   * Protocol version.
   *
   * @api public
   */
  
  exports.protocol = 4;
  
  /**
   * Packet types.
   *
   * @api public
   */
  
  exports.types = [
    'CONNECT',
    'DISCONNECT',
    'EVENT',
    'ACK',
    'ERROR',
    'BINARY_EVENT',
    'BINARY_ACK'
  ];
  
  /**
   * Packet type `connect`.
   *
   * @api public
   */
  
  exports.CONNECT = 0;
  
  /**
   * Packet type `disconnect`.
   *
   * @api public
   */
  
  exports.DISCONNECT = 1;
  
  /**
   * Packet type `event`.
   *
   * @api public
   */
  
  exports.EVENT = 2;
  
  /**
   * Packet type `ack`.
   *
   * @api public
   */
  
  exports.ACK = 3;
  
  /**
   * Packet type `error`.
   *
   * @api public
   */
  
  exports.ERROR = 4;
  
  /**
   * Packet type 'binary event'
   *
   * @api public
   */
  
  exports.BINARY_EVENT = 5;
  
  /**
   * Packet type `binary ack`. For acks with binary arguments.
   *
   * @api public
   */
  
  exports.BINARY_ACK = 6;
  
  /**
   * Encoder constructor.
   *
   * @api public
   */
  
  exports.Encoder = Encoder;
  
  /**
   * Decoder constructor.
   *
   * @api public
   */
  
  exports.Decoder = Decoder;
  
  /**
   * A socket.io Encoder instance
   *
   * @api public
   */
  
  function Encoder() {}
  
  var ERROR_PACKET = exports.ERROR + '"encode error"';
  
  /**
   * Encode a packet as a single string if non-binary, or as a
   * buffer sequence, depending on packet type.
   *
   * @param {Object} obj - packet object
   * @param {Function} callback - function to handle encodings (likely engine.write)
   * @return Calls callback with Array of encodings
   * @api public
   */
  
  Encoder.prototype.encode = function(obj, callback){
    debug('encoding packet %j', obj);
  
    if (exports.BINARY_EVENT === obj.type || exports.BINARY_ACK === obj.type) {
      encodeAsBinary(obj, callback);
    } else {
      var encoding = encodeAsString(obj);
      callback([encoding]);
    }
  };
  
  /**
   * Encode packet as string.
   *
   * @param {Object} packet
   * @return {String} encoded
   * @api private
   */
  
  function encodeAsString(obj) {
  
    // first is type
    var str = '' + obj.type;
  
    // attachments if we have them
    if (exports.BINARY_EVENT === obj.type || exports.BINARY_ACK === obj.type) {
      str += obj.attachments + '-';
    }
  
    // if we have a namespace other than `/`
    // we append it followed by a comma `,`
    if (obj.nsp && '/' !== obj.nsp) {
      str += obj.nsp + ',';
    }
  
    // immediately followed by the id
    if (null != obj.id) {
      str += obj.id;
    }
  
    // json data
    if (null != obj.data) {
      var payload = tryStringify(obj.data);
      if (payload !== false) {
        str += payload;
      } else {
        return ERROR_PACKET;
      }
    }
  
    debug('encoded %j as %s', obj, str);
    return str;
  }
  
  function tryStringify(str) {
    try {
      return JSON.stringify(str);
    } catch(e){
      return false;
    }
  }
  
  /**
   * Encode packet as 'buffer sequence' by removing blobs, and
   * deconstructing packet into object with placeholders and
   * a list of buffers.
   *
   * @param {Object} packet
   * @return {Buffer} encoded
   * @api private
   */
  
  function encodeAsBinary(obj, callback) {
  
    function writeEncoding(bloblessData) {
      var deconstruction = binary.deconstructPacket(bloblessData);
      var pack = encodeAsString(deconstruction.packet);
      var buffers = deconstruction.buffers;
  
      buffers.unshift(pack); // add packet info to beginning of data list
      callback(buffers); // write all the buffers
    }
  
    binary.removeBlobs(obj, writeEncoding);
  }
  
  /**
   * A socket.io Decoder instance
   *
   * @return {Object} decoder
   * @api public
   */
  
  function Decoder() {
    this.reconstructor = null;
  }
  
  /**
   * Mix in `Emitter` with Decoder.
   */
  
  Emitter(Decoder.prototype);
  
  /**
   * Decodes an encoded packet string into packet JSON.
   *
   * @param {String} obj - encoded packet
   * @return {Object} packet
   * @api public
   */
  
  Decoder.prototype.add = function(obj) {
    var packet;
    if (typeof obj === 'string') {
      packet = decodeString(obj);
      if (exports.BINARY_EVENT === packet.type || exports.BINARY_ACK === packet.type) { // binary packet's json
        this.reconstructor = new BinaryReconstructor(packet);
  
        // no attachments, labeled binary but no binary data to follow
        if (this.reconstructor.reconPack.attachments === 0) {
          this.emit('decoded', packet);
        }
      } else { // non-binary full packet
        this.emit('decoded', packet);
      }
    } else if (isBuf(obj) || obj.base64) { // raw binary data
      if (!this.reconstructor) {
        throw new Error('got binary data when not reconstructing a packet');
      } else {
        packet = this.reconstructor.takeBinaryData(obj);
        if (packet) { // received final buffer
          this.reconstructor = null;
          this.emit('decoded', packet);
        }
      }
    } else {
      throw new Error('Unknown type: ' + obj);
    }
  };
  
  /**
   * Decode a packet String (JSON data)
   *
   * @param {String} str
   * @return {Object} packet
   * @api private
   */
  
  function decodeString(str) {
    var i = 0;
    // look up type
    var p = {
      type: Number(str.charAt(0))
    };
  
    if (null == exports.types[p.type]) {
      return error('unknown packet type ' + p.type);
    }
  
    // look up attachments if type binary
    if (exports.BINARY_EVENT === p.type || exports.BINARY_ACK === p.type) {
      var start = i + 1;
      while (str.charAt(++i) !== '-' && i != str.length) {}
      var buf = str.substring(start, i);
      if (buf != Number(buf) || str.charAt(i) !== '-') {
        throw new Error('Illegal attachments');
      }
      p.attachments = Number(buf);
    }
  
    // look up namespace (if any)
    if ('/' === str.charAt(i + 1)) {
      var start = i + 1;
      while (++i) {
        var c = str.charAt(i);
        if (',' === c) break;
        if (i === str.length) break;
      }
      p.nsp = str.substring(start, i);
    } else {
      p.nsp = '/';
    }
  
    // look up id
    var next = str.charAt(i + 1);
    if ('' !== next && Number(next) == next) {
      var start = i + 1;
      while (++i) {
        var c = str.charAt(i);
        if (null == c || Number(c) != c) {
          --i;
          break;
        }
        if (i === str.length) break;
      }
      p.id = Number(str.substring(start, i + 1));
    }
  
    // look up json data
    if (str.charAt(++i)) {
      var payload = tryParse(str.substr(i));
      var isPayloadValid = payload !== false && (p.type === exports.ERROR || isArray(payload));
      if (isPayloadValid) {
        p.data = payload;
      } else {
        return error('invalid payload');
      }
    }
  
    debug('decoded %s as %j', str, p);
    return p;
  }
  
  function tryParse(str) {
    try {
      return JSON.parse(str);
    } catch(e){
      return false;
    }
  }
  
  /**
   * Deallocates a parser's resources
   *
   * @api public
   */
  
  Decoder.prototype.destroy = function() {
    if (this.reconstructor) {
      this.reconstructor.finishedReconstruction();
    }
  };
  
  /**
   * A manager of a binary event's 'buffer sequence'. Should
   * be constructed whenever a packet of type BINARY_EVENT is
   * decoded.
   *
   * @param {Object} packet
   * @return {BinaryReconstructor} initialized reconstructor
   * @api private
   */
  
  function BinaryReconstructor(packet) {
    this.reconPack = packet;
    this.buffers = [];
  }
  
  /**
   * Method to be called when binary data received from connection
   * after a BINARY_EVENT packet.
   *
   * @param {Buffer | ArrayBuffer} binData - the raw binary data received
   * @return {null | Object} returns null if more binary data is expected or
   *   a reconstructed packet object if all buffers have been received.
   * @api private
   */
  
  BinaryReconstructor.prototype.takeBinaryData = function(binData) {
    this.buffers.push(binData);
    if (this.buffers.length === this.reconPack.attachments) { // done with buffer list
      var packet = binary.reconstructPacket(this.reconPack, this.buffers);
      this.finishedReconstruction();
      return packet;
    }
    return null;
  };
  
  /**
   * Cleans up binary packet reconstruction variables.
   *
   * @api private
   */
  
  BinaryReconstructor.prototype.finishedReconstruction = function() {
    this.reconPack = null;
    this.buffers = [];
  };
  
  function error(msg) {
    return {
      type: exports.ERROR,
      data: 'parser error: ' + msg
    };
  }
  
  },{"./binary":89,"./is-buffer":91,"component-emitter":12,"debug":87,"isarray":38}],91:[function(require,module,exports){
  (function (Buffer){(function (){
  
  module.exports = isBuf;
  
  var withNativeBuffer = typeof Buffer === 'function' && typeof Buffer.isBuffer === 'function';
  var withNativeArrayBuffer = typeof ArrayBuffer === 'function';
  
  var isView = function (obj) {
    return typeof ArrayBuffer.isView === 'function' ? ArrayBuffer.isView(obj) : (obj.buffer instanceof ArrayBuffer);
  };
  
  /**
   * Returns true if obj is a buffer or an arraybuffer.
   *
   * @api private
   */
  
  function isBuf(obj) {
    return (withNativeBuffer && Buffer.isBuffer(obj)) ||
            (withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj)));
  }
  
  }).call(this)}).call(this,require("buffer").Buffer)
  },{"buffer":10}],92:[function(require,module,exports){
  module.exports = toArray
  
  function toArray(list, index) {
      var array = []
  
      index = index || 0
  
      for (var i = index || 0; i < list.length; i++) {
          array[i - index] = list[i]
      }
  
      return array
  }
  
  },{}],93:[function(require,module,exports){
  'use strict';
  
  var alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split('')
    , length = 64
    , map = {}
    , seed = 0
    , i = 0
    , prev;
  
  /**
   * Return a string representing the specified number.
   *
   * @param {Number} num The number to convert.
   * @returns {String} The string representation of the number.
   * @api public
   */
  function encode(num) {
    var encoded = '';
  
    do {
      encoded = alphabet[num % length] + encoded;
      num = Math.floor(num / length);
    } while (num > 0);
  
    return encoded;
  }
  
  /**
   * Return the integer value specified by the given string.
   *
   * @param {String} str The string to convert.
   * @returns {Number} The integer value represented by the string.
   * @api public
   */
  function decode(str) {
    var decoded = 0;
  
    for (i = 0; i < str.length; i++) {
      decoded = decoded * length + map[str.charAt(i)];
    }
  
    return decoded;
  }
  
  /**
   * Yeast: A tiny growing id generator.
   *
   * @returns {String} A unique id.
   * @api public
   */
  function yeast() {
    var now = encode(+new Date());
  
    if (now !== prev) return seed = 0, prev = now;
    return now +'.'+ encode(seed++);
  }
  
  //
  // Map each character to its index.
  //
  for (; i < length; i++) map[alphabet[i]] = i;
  
  //
  // Expose the `yeast`, `encode` and `decode` functions.
  //
  yeast.encode = encode;
  yeast.decode = decode;
  module.exports = yeast;
  
  },{}],94:[function(require,module,exports){
  module.exports = {
    hubAddress: 'https://hub.dev.linx.safemobile.com/',
    mediasoupAddress: 'https://localhost:3000/mediasoup',
  }
  },{}],95:[function(require,module,exports){
  const io = require('socket.io-client')
  const mediasoupClient = require('mediasoup-client')
  const urlParams = new URLSearchParams(location.search);
  const config = require('./config')
  console.log('[CONFIG]', config);
  
  const ASSET_ID = parseInt(urlParams.get('assetId')) || null;
  const ACCOUNT_ID = parseInt(urlParams.get('accountId')) || null;
  let callId = parseInt(urlParams.get('callId')) || null;
  const IS_PRODUCER = urlParams.get('producer') === 'true' ? true : false
  console.log('[URL] ASSET_ID', ASSET_ID, '| ACCOUNT_ID', ACCOUNT_ID, '| callId', callId, ' | IS_PRODUCER', IS_PRODUCER)
  
  let socket 
  hub = io(config.hubAddress)
  
  const connectToMediasoup = () => {
  
    socket = io(config.mediasoupAddress)
  
    socket.on('connection-success', ({ _socketId, existsProducer }) => {
      console.log(`[MEDIA] ${config.mediasoupAddress} | connected: ${socket.connected} | existsProducer: ${existsProducer}`)
      if (!IS_PRODUCER && existsProducer && consumer === undefined) { 
        goConnect()
        // document.getElementById('btnRecvSendTransport').click();
      }
      if (IS_PRODUCER && urlParams.get('testing') === 'true') { getLocalStream() }
    })
  }
  
  if (IS_PRODUCER === true) {
    hub.on('connect', async () => {
      console.log(`[HUB] ${config.hubAddress} | connected: ${hub.connected}`)
      connectToMediasoup()
  
      hub.emit(
        'ars',
        JSON.stringify({
          ars: true,
          asset_id: ASSET_ID,
          account_id: ACCOUNT_ID,
        })
      );
    
      hub.on('video', (data) => {
        const parsedData = JSON.parse(data);
        console.log('video', parsedData)
        originAssetId = parsedData.origin_asset_id;
        originAssetName = parsedData.origin_asset_name;
        originAssetTypeName = parsedData.origin_asset_type_name;
        callId = parsedData.video_call_id;
    
        console.log('IS_PRODUCER', IS_PRODUCER, 'callId', callId);
        
        if (parsedData.type === 'notify-request' && IS_PRODUCER) {
          getLocalStream()
        }
      })
    })
  
    hub.on('connect_error', (error) => {
      console.log('connect_error', error);
    });
    
    hub.on('connection', () => {
      console.log('connection')
    })
    
    hub.on('disconnect', () => {
      console.log('disconnect')
    })
  } else {
    connectToMediasoup()
  }
  
  let device
  let rtpCapabilities
  let producerTransport
  let consumerTransport
  let producer
  let consumer
  let originAssetId
  let originAssetName
  let originAssetTypeName
  
  // https://mediasoup.org/documentation/v3/mediasoup-client/api/#ProducerOptions
  // https://mediasoup.org/documentation/v3/mediasoup-client/api/#transport-produce
  let params = {
    // mediasoup params
    encodings: [
      {
        rid: 'r0',
        maxBitrate: 100000,
        scalabilityMode: 'S1T3',
      },
      {
        rid: 'r1',
        maxBitrate: 300000,
        scalabilityMode: 'S1T3',
      },
      {
        rid: 'r2',
        maxBitrate: 900000,
        scalabilityMode: 'S1T3',
      },
    ],
    // https://mediasoup.org/documentation/v3/mediasoup-client/api/#ProducerCodecOptions
    codecOptions: {
      videoGoogleStartBitrate: 1000
    }
  }
  
  const streamSuccess = (stream) => {
    localVideo.srcObject = stream
    const track = stream.getVideoTracks()[0]
    params = {
      track,
      ...params
    }
    goConnect()
  }
  
  const getLocalStream = () => {
    console.log('[getLocalStream]');
    navigator.mediaDevices.getUserMedia({
      audio: false,
      video: {
        width: {
          min: 640,
          max: 1920,
        },
        height: {
          min: 400,
          max: 1080,
        }
      }
    })
    .then(streamSuccess)
    .catch(error => {
      console.log(error.message)
    })
  }
  
  const goConnect = () => {
    device === undefined ? getRtpCapabilities() : goCreateTransport()
  }
  
  const goCreateTransport = () => {
    IS_PRODUCER ? createSendTransport() : createRecvTransport()
  }
  
  // A device is an endpoint connecting to a Router on the 
  // server side to send/recive media
  const createDevice = async () => {
    try {
      device = new mediasoupClient.Device()
  
      // https://mediasoup.org/documentation/v3/mediasoup-client/api/#device-load
      // Loads the device with RTP capabilities of the Router (server side)
      await device.load({
        // see getRtpCapabilities() below
        routerRtpCapabilities: rtpCapabilities
      })
  
      console.log('Device RTP Capabilities', device.rtpCapabilities)
  
      // once the device loads, create transport
      goCreateTransport()
  
    } catch (error) {
      console.log(error)
      if (error.name === 'UnsupportedError')
        console.warn('browser not supported')
    }
  }
  
  const getRtpCapabilities = () => {
    // make a request to the server for Router RTP Capabilities
    // see server's socket.on('getRtpCapabilities', ...)
    // the server sends back data object which contains rtpCapabilities
    socket.emit('createRoom', { callId }, (data) => {
      console.log(`Router RTP Capabilities... ${data.rtpCapabilities}`)
  
      // we assign to local variable and will be used when
      // loading the client Device (see createDevice above)
      rtpCapabilities = data.rtpCapabilities
  
      // once we have rtpCapabilities from the Router, create Device
      createDevice()
    })
  }
  
  const createSendTransport = () => {
    // see server's socket.on('createWebRtcTransport', sender?, ...)
    // this is a call from Producer, so sender = true
    socket.emit('createWebRtcTransport', { sender: true, callId }, ({ params }) => {
      // The server sends back params needed 
      // to create Send Transport on the client side
      if (params.error) {
        console.log(params.error)
        return
      }
  
      console.log(params)
  
      // creates a new WebRTC Transport to send media
      // based on the server's producer transport params
      // https://mediasoup.org/documentation/v3/mediasoup-client/api/#TransportOptions
      producerTransport = device.createSendTransport(params)
  
      // https://mediasoup.org/documentation/v3/communication-between-client-and-server/#producing-media
      // this event is raised when a first call to transport.produce() is made
      // see connectSendTransport() below
      producerTransport.on('connect', async ({ dtlsParameters }, callback, errback) => {
        try {
          // Signal local DTLS parameters to the server side transport
          // see server's socket.on('transport-connect', ...)
          await socket.emit('transport-connect', {
            dtlsParameters,
          })
  
          // Tell the transport that parameters were transmitted.
          callback()
  
        } catch (error) {
          errback(error)
        }
      })
  
      producerTransport.on('produce', async (parameters, callback, errback) => {
        console.log(parameters)
  
        try {
          // tell the server to create a Producer
          // with the following parameters and produce
          // and expect back a server side producer id
          // see server's socket.on('transport-produce', ...)
          await socket.emit('transport-produce', {
            kind: parameters.kind,
            rtpParameters: parameters.rtpParameters,
            appData: parameters.appData,
          }, ({ id }) => {
            // Tell the transport that parameters were transmitted and provide it with the
            // server side producer's id.
            callback({ id })
          })
        } catch (error) {
          errback(error)
        }
      })
  
      connectSendTransport()
    })
  }
  
  const connectSendTransport = async () => {
    // we now call produce() to instruct the producer transport
    // to send media to the Router
    // https://mediasoup.org/documentation/v3/mediasoup-client/api/#transport-produce
    // this action will trigger the 'connect' and 'produce' events above
    producer = await producerTransport.produce(params)
  
    producer.on('trackended', () => {
      console.log('track ended')
  
      // close video track
    })
  
    producer.on('transportclose', () => {
      console.log('transport ended')
      // close video track
    })
  
    const answer = {
      origin_asset_id: ASSET_ID,
      dest_asset_id: originAssetId || parseInt(urlParams.get('dest_asset_id')),
      type: 'notify-answer',
      origin_asset_priority: 1,
      origin_asset_type_name: originAssetTypeName,
      origin_asset_name: originAssetName,
      video_call_id: callId,
      answer: 'accepted', // answer: 'rejected'
    };
    console.log('SEND answer', answer);
  
    hub.emit(
      'video',
      JSON.stringify(answer)
    );
  }
  
  const createRecvTransport = async () => {
    console.log('createRecvTransport');
    // see server's socket.on('consume', sender?, ...)
    // this is a call from Consumer, so sender = false
    await socket.emit('createWebRtcTransport', { sender: false, callId }, ({ params }) => {
      // The server sends back params needed 
      // to create Send Transport on the client side
      if (params.error) {
        console.log(params.error)
        return
      }
  
      console.log(params)
  
      // creates a new WebRTC Transport to receive media
      // based on server's consumer transport params
      // https://mediasoup.org/documentation/v3/mediasoup-client/api/#device-createRecvTransport
      consumerTransport = device.createRecvTransport(params)
  
      // https://mediasoup.org/documentation/v3/communication-between-client-and-server/#producing-media
      // this event is raised when a first call to transport.produce() is made
      // see connectRecvTransport() below
      consumerTransport.on('connect', async ({ dtlsParameters }, callback, errback) => {
        try {
          // Signal local DTLS parameters to the server side transport
          // see server's socket.on('transport-recv-connect', ...)
          await socket.emit('transport-recv-connect', {
            dtlsParameters,
          })
  
          // Tell the transport that parameters were transmitted.
          callback()
        } catch (error) {
          // Tell the transport that something was wrong
          errback(error)
        }
      })
      connectRecvTransport()
    })
  }
  
  const connectRecvTransport = async () => {
    console.log('connectRecvTransport');
    // for consumer, we need to tell the server first
    // to create a consumer based on the rtpCapabilities and consume
    // if the router can consume, it will send back a set of params as below
    await socket.emit('consume', {
      rtpCapabilities: device.rtpCapabilities,
      callId
    }, async ({ params }) => {
      if (params.error) {
        console.log('Cannot Consume')
        return
      }
  
      // then consume with the local consumer transport
      // which creates a consumer
      consumer = await consumerTransport.consume({
        id: params.id,
        producerId: params.producerId,
        kind: params.kind,
        rtpParameters: params.rtpParameters
      })
  
      // destructure and retrieve the video track from the producer
      const { track } = consumer
  
      let stream = new MediaStream()
      stream.addTrack(track)
      // stream.removeTrack(track)
      remoteVideo.srcObject = stream
      socket.emit('consumer-resume')
      console.log('consumer', consumer);
  
    })
  }
  
  btnLocalVideo.addEventListener('click', getLocalStream)
  btnRecvSendTransport.addEventListener('click', goConnect)
  },{"./config":94,"mediasoup-client":66,"socket.io-client":82}]},{},[95]);