require('dotenv').config(); const express = require('express'); const app = express(); const Server = require('socket.io'); const path = require('node:path'); const fs = require('node:fs'); let https; try { https = require('node:https'); } catch (err) { console.log('https support is disabled!'); } const mediasoup = require('mediasoup'); let worker; /** * * videoCalls - Dictionary of Object(s) * '': { * router: Router, * initiatorAudioProducer: Producer, * initiatorVideoProducer: Producer, * receiverVideoProducer: Producer, * receiverAudioProducer: Producer, * initiatorProducerTransport: Producer Transport, * receiverProducerTransport: Producer Transport, * initiatorConsumerVideo: Consumer, * initiatorConsumerAudio: Consumer, * initiatorConsumerTransport: Consumer Transport * initiatorSocket * receiverSocket * } * **/ let videoCalls = {}; let socketDetails = {}; app.get('/', (_req, res) => { res.send('Hello from mediasoup app!'); }); app.use('/sfu', express.static(path.join(__dirname, 'public'))); // SSL cert for HTTPS access const options = { key: fs.readFileSync(process.env.SERVER_KEY, 'utf-8'), cert: fs.readFileSync(process.env.SERVER_CERT, 'utf-8'), }; const httpsServer = https.createServer(options, app); const io = new Server(httpsServer, { allowEIO3: true, origins: ['*:*'], }); httpsServer.listen(process.env.PORT, () => { console.log('Video server listening on port:', process.env.PORT); }); const peers = io.of('/'); const createWorker = async () => { try { worker = await mediasoup.createWorker({ rtcMinPort: parseInt(process.env.RTC_MIN_PORT), rtcMaxPort: parseInt(process.env.RTC_MAX_PORT), }); console.log(`[createWorker] worker pid ${worker.pid}`); worker.on('died', (error) => { // This implies something serious happened, so kill the application console.error('mediasoup worker has died', error); setTimeout(() => process.exit(1), 2000); // exit in 2 seconds }); return worker; } catch (error) { console.log(`ERROR | createWorker | ${error.message}`); } }; // We create a Worker as soon as our application starts worker = createWorker(); // This is an Array of RtpCapabilities // https://mediasoup.org/documentation/v3/mediasoup/rtp-parameters-and-capabilities/#RtpCodecCapability // list of media codecs supported by mediasoup ... // https://github.com/versatica/mediasoup/blob/v3/src/supportedRtpCapabilities.ts const mediaCodecs = [ { kind: 'audio', mimeType: 'audio/opus', clockRate: 48000, channels: 2, }, { kind: 'video', mimeType: 'video/VP8', clockRate: 90000, parameters: { 'x-google-start-bitrate': 1000, }, channels: 2, }, { kind: 'video', mimeType: 'video/VP9', clockRate: 90000, parameters: { 'profile-id': 2, 'x-google-start-bitrate': 1000, }, }, { kind: 'video', mimeType: 'video/h264', clockRate: 90000, parameters: { 'packetization-mode': 1, 'profile-level-id': '4d0032', 'level-asymmetry-allowed': 1, 'x-google-start-bitrate': 1000, }, }, { kind: 'video', mimeType: 'video/h264', clockRate: 90000, parameters: { 'packetization-mode': 1, 'profile-level-id': '42e01f', 'level-asymmetry-allowed': 1, 'x-google-start-bitrate': 1000, }, }, ]; const closeCall = (callId) => { try { if (callId && videoCalls[callId]) { videoCalls[callId].receiverVideoProducer?.close(); videoCalls[callId].receiverAudioProducer?.close(); videoCalls[callId].initiatorConsumerVideo?.close(); videoCalls[callId].initiatorConsumerAudio?.close(); videoCalls[callId]?.initiatorConsumerTransport?.close(); videoCalls[callId]?.receiverProducerTransport?.close(); videoCalls[callId]?.router?.close(); delete videoCalls[callId]; } else { console.log(`The call with id ${callId} has already been deleted`); } } catch (error) { console.log(`ERROR | closeCall | callid ${callId} | ${error.message}`); } }; /* - Handlers for WS events - These are created only when we have a connection with a peer */ peers.on('connection', async (socket) => { console.log('[connection] socketId:', socket.id); // After making the connection successfully, we send the client a 'connection-success' event socket.emit('connection-success', { socketId: socket.id, }); // It is triggered when the peer is disconnected socket.on('disconnect', () => { const callId = socketDetails[socket.id]; console.log(`disconnect | socket ${socket.id} | callId ${callId}`); delete socketDetails[socket.id]; closeCall(callId); }); /* - This event creates a room with the roomId and the callId sent - It will return the rtpCapabilities of that room - If the room already exists, it will not create it, but will only return rtpCapabilities */ socket.on('createRoom', async ({ callId }, callback) => { let callbackResponse = null; try { // We can continue with the room creation process only if we have a callId if (callId) { console.log(`[createRoom] socket.id ${socket.id} callId ${callId}`); if (!videoCalls[callId]) { videoCalls[callId] = { router: await worker.createRouter({ mediaCodecs }) }; console.log(`[createRoom] Router ID: ${videoCalls[callId].router.id}`); videoCalls[callId].receiverSocket = socket; } else { videoCalls[callId].initiatorSocket = socket; } socketDetails[socket.id] = callId; // rtpCapabilities is set for callback console.log('[getRtpCapabilities] callId', callId); callbackResponse = { rtpCapabilities: videoCalls[callId].router.rtpCapabilities, }; } else { console.log(`[createRoom] missing callId ${callId}`); } } catch (error) { console.log(`ERROR | createRoom | callId ${callId} | ${error.message}`); } finally { callback(callbackResponse); } }); /* - Client emits a request to create server side Transport - Depending on the sender, a producer or consumer is created is created on that router - It will return parameters, these are required for the client to create the RecvTransport from the client. - If the client is producer(sender: true) then it will use parameters for device.createSendTransport(params) - If the client is a consumer(sender: false) then it will use parameters for device.createRecvTransport(params) */ socket.on('createWebRtcTransport', async ({ sender }, callback) => { try { const callId = socketDetails[socket.id]; console.log(`[createWebRtcTransport] socket ${socket.id} | sender ${sender} | callId ${callId}`); if (sender) { if (!videoCalls[callId].receiverProducerTransport && !isInitiator(callId, socket.id)) { videoCalls[callId].receiverProducerTransport = await createWebRtcTransportLayer(callId, callback); } else if (!videoCalls[callId].initiatorProducerTransport && isInitiator(callId, socket.id)) { videoCalls[callId].initiatorProducerTransport = await createWebRtcTransportLayer(callId, callback); } else { console.log(`producerTransport has already been defined | callId ${callId}`); callback(null); } } else if (!sender) { if (!videoCalls[callId].receiverConsumerTransport && !isInitiator(callId, socket.id)) { videoCalls[callId].receiverConsumerTransport = await createWebRtcTransportLayer(callId, callback); } else if (!videoCalls[callId].initiatorConsumerTransport && isInitiator(callId, socket.id)) { videoCalls[callId].initiatorConsumerTransport = await createWebRtcTransportLayer(callId, callback); } } } catch (error) { console.log( `ERROR | createWebRtcTransport | callId ${socketDetails[socket.id]} | sender ${sender} | ${error.message}` ); callback(error); } }); /* - The client sends this event after successfully creating a createSendTransport(AS PRODUCER) - The connection is made to the created transport */ socket.on('transport-connect', async ({ dtlsParameters }) => { try { const callId = socketDetails[socket.id]; if (typeof dtlsParameters === 'string') dtlsParameters = JSON.parse(dtlsParameters); console.log(`[transport-connect] socket ${socket.id} | callId ${callId}`); isInitiator(callId, socket.id) ? await videoCalls[callId].initiatorProducerTransport.connect({ dtlsParameters }) : await videoCalls[callId].receiverProducerTransport.connect({ dtlsParameters }); } catch (error) { console.log(`ERROR | transport-connect | callId ${socketDetails[socket.id]} | ${error.message}`); } }); /* - The event sent by the client (PRODUCER) after successfully connecting to receiverProducerTransport/initiatorProducerTransport - For the router with the id callId, we make produce on receiverProducerTransport/initiatorProducerTransport - Create the handler on producer at the 'transportclose' event */ socket.on('transport-produce', async ({ kind, rtpParameters, appData }, callback) => { try { const callId = socketDetails[socket.id]; if (typeof rtpParameters === 'string') rtpParameters = JSON.parse(rtpParameters); console.log(`[transport-produce] kind: ${kind} | socket: ${socket.id} | callId: ${callId}`); if (kind === 'video') { if (!isInitiator(callId, socket.id)) { videoCalls[callId].receiverVideoProducer = await videoCalls[callId].receiverProducerTransport.produce({ kind, rtpParameters, }); console.log( `[transport-produce] receiverVideoProducer Producer ID: ${videoCalls[callId].receiverVideoProducer.id} | kind: ${videoCalls[callId].receiverVideoProducer.kind}` ); videoCalls[callId].receiverVideoProducer.on('transportclose', () => { const callId = socketDetails[socket.id]; console.log('transport for this producer closed', callId); closeCall(callId); }); // Send back to the client the Producer's id callback && callback({ id: videoCalls[callId].receiverVideoProducer.id, }); } else { videoCalls[callId].initiatorVideoProducer = await videoCalls[callId].initiatorProducerTransport.produce({ kind, rtpParameters, }); console.log( `[transport-produce] initiatorVideoProducer Producer ID: ${videoCalls[callId].initiatorVideoProducer.id} | kind: ${videoCalls[callId].initiatorVideoProducer.kind}` ); videoCalls[callId].initiatorVideoProducer.on('transportclose', () => { const callId = socketDetails[socket.id]; console.log('transport for this producer closed', callId); closeCall(callId); }); callback && callback({ id: videoCalls[callId].initiatorVideoProducer.id, }); } } else if (kind === 'audio') { if (!isInitiator(callId, socket.id)) { videoCalls[callId].receiverAudioProducer = await videoCalls[callId].receiverProducerTransport.produce({ kind, rtpParameters, }); console.log( `[transport-produce] receiverAudioProducer Producer ID: ${videoCalls[callId].receiverAudioProducer.id} | kind: ${videoCalls[callId].receiverAudioProducer.kind}` ); videoCalls[callId].receiverAudioProducer.on('transportclose', () => { const callId = socketDetails[socket.id]; console.log('transport for this producer closed', callId); closeCall(callId); }); // Send back to the client the Producer's id callback && callback({ id: videoCalls[callId].receiverAudioProducer.id, }); } else { videoCalls[callId].initiatorAudioProducer = await videoCalls[callId].initiatorProducerTransport.produce({ kind, rtpParameters, }); console.log( `[transport-produce] initiatorAudioProducer Producer ID: ${videoCalls[callId].initiatorAudioProducer.id} | kind: ${videoCalls[callId].initiatorAudioProducer.kind}` ); videoCalls[callId].initiatorAudioProducer.on('transportclose', () => { const callId = socketDetails[socket.id]; console.log('transport for this producer closed', callId); closeCall(callId); }); // Send back to the client the Producer's id callback && callback({ id: videoCalls[callId].initiatorAudioProducer.id, }); } } const socketToEmit = isInitiator(callId, socket.id) ? videoCalls[callId].receiverSocket : videoCalls[callId].initiatorSocket; socketToEmit.emit('new-producer', { callId }); } catch (error) { console.log(`ERROR | transport-produce | callId ${socketDetails[socket.id]} | ${error.message}`); } }); /* - The client sends this event after successfully creating a createRecvTransport(AS CONSUMER) - The connection is made to the created consumerTransport */ socket.on('transport-recv-connect', async ({ dtlsParameters }) => { try { const callId = socketDetails[socket.id]; console.log(`[transport-recv-connect] socket ${socket.id} | callId ${callId}`); if (typeof dtlsParameters === 'string') dtlsParameters = JSON.parse(dtlsParameters); // await videoCalls[callId].consumerTransport.connect({ dtlsParameters }); if (!isInitiator(callId, socket.id)) { await videoCalls[callId].receiverConsumerTransport.connect({ dtlsParameters }); } else if (isInitiator(callId, socket.id)) { await videoCalls[callId].initiatorConsumerTransport.connect({ dtlsParameters }); } } catch (error) { console.log(`ERROR | transport-recv-connect | callId ${socketDetails[socket.id]} | ${error.message}`); } }); /* - The customer consumes after successfully connecting to consumerTransport - The previous step was 'transport-recv-connect', and before that 'createWebRtcTransport' - This event is only sent by the consumer - The parameters that the consumer consumes are returned - The consumer does consumerTransport.consume(params) */ socket.on('consume', async ({ rtpCapabilities }, callback) => { try { const callId = socketDetails[socket.id]; console.log( `[consume] socket ${socket.id} | callId ${callId} | rtpCapabilities: ${JSON.stringify(rtpCapabilities)}` ); if (typeof rtpCapabilities === 'string') rtpCapabilities = JSON.parse(rtpCapabilities); console.log('[consume] callId', callId); let canConsumeVideo, canConsumeAudio; if (isInitiator(callId, socket.id)) { canConsumeVideo = !!videoCalls[callId].receiverVideoProducer && !!videoCalls[callId].router.canConsume({ producerId: videoCalls[callId].receiverVideoProducer.id, rtpCapabilities, }); canConsumeAudio = !!videoCalls[callId].receiverAudioProducer && !!videoCalls[callId].router.canConsume({ producerId: videoCalls[callId].receiverAudioProducer.id, rtpCapabilities, }); } else { canConsumeVideo = !!videoCalls[callId].initiatorVideoProducer && !!videoCalls[callId].router.canConsume({ producerId: videoCalls[callId].initiatorVideoProducer.id, rtpCapabilities, }); canConsumeAudio = !!videoCalls[callId].initiatorAudioProducer && !!videoCalls[callId].router.canConsume({ producerId: videoCalls[callId].initiatorAudioProducer.id, rtpCapabilities, }); } console.log('[consume] canConsumeVideo', canConsumeVideo); console.log('[consume] canConsumeAudio', canConsumeAudio); if (canConsumeVideo && !canConsumeAudio) { const videoParams = await consumeVideo(callId, socket.id, rtpCapabilities); callback({ videoParams, audioParams: null }); } else if (canConsumeVideo && canConsumeAudio) { const videoParams = await consumeVideo(callId, socket.id, rtpCapabilities); const audioParams = await consumeAudio(callId, socket.id, rtpCapabilities); callback({ videoParams, audioParams }); } else if (!canConsumeVideo && canConsumeAudio) { const audioParams = await consumeAudio(callId, socket.id, rtpCapabilities); const data = { videoParams: null, audioParams }; callback(data); } else { console.log(`[consume] Can't consume | callId ${callId}`); callback(null); } } catch (error) { console.log(`ERROR | consume | callId ${socketDetails[socket.id]} | ${error.message}`); callback({ params: { error } }); } }); /* - Event sent by the consumer after consuming to resume the pause - When consuming on consumerTransport, it is initially done with paused: true, here we will resume - For the initiator we resume the initiatorConsumerAUDIO/VIDEO and for receiver the receiverConsumerAUDIO/VIDEO */ socket.on('consumer-resume', () => { try { const callId = socketDetails[socket.id]; console.log(`[consumer-resume] callId ${callId}`); if (isInitiator(callId, socket.id)) { videoCalls[callId]?.initiatorConsumerVideo?.resume(); videoCalls[callId]?.initiatorConsumerAudio?.resume(); } else { videoCalls[callId]?.receiverConsumerVideo?.resume(); videoCalls[callId]?.receiverConsumerAudio?.resume(); } } catch (error) { console.log(`ERROR | consumer-resume | callId ${socketDetails[socket.id]} | ${error.message}`); } }); }); const consumeVideo = async (callId, socketId, rtpCapabilities) => { if (isInitiator(callId, socketId)) { videoCalls[callId].initiatorConsumerVideo = await videoCalls[callId].initiatorConsumerTransport.consume({ producerId: videoCalls[callId].receiverVideoProducer.id, rtpCapabilities, paused: true, }); // https://mediasoup.org/documentation/v3/mediasoup/api/#consumer-on-transportclose videoCalls[callId].initiatorConsumerVideo.on('transportclose', () => { const callId = socketDetails[socket.id]; console.log('transport close from consumer', callId); closeCall(callId); }); // https://mediasoup.org/documentation/v3/mediasoup/api/#consumer-on-producerclose videoCalls[callId].initiatorConsumerVideo.on('producerclose', () => { const callId = socketDetails[socket.id]; console.log('producer of consumer closed', callId); closeCall(callId); }); return { id: videoCalls[callId].initiatorConsumerVideo.id, producerId: videoCalls[callId].receiverVideoProducer.id, kind: 'video', rtpParameters: videoCalls[callId].initiatorConsumerVideo.rtpParameters, }; } else { videoCalls[callId].receiverConsumerVideo = await videoCalls[callId].receiverConsumerTransport.consume({ producerId: videoCalls[callId].initiatorVideoProducer.id, rtpCapabilities, paused: true, }); videoCalls[callId].receiverConsumerVideo.on('transportclose', () => { const callId = socketDetails[socket.id]; console.log('transport close from consumer', callId); closeCall(callId); }); videoCalls[callId].receiverConsumerVideo.on('producerclose', () => { const callId = socketDetails[socket.id]; console.log('producer of consumer closed', callId); closeCall(callId); }); return { id: videoCalls[callId].receiverConsumerVideo.id, producerId: videoCalls[callId].initiatorVideoProducer.id, kind: 'video', rtpParameters: videoCalls[callId].receiverConsumerVideo.rtpParameters, }; } }; const consumeAudio = async (callId, socketId, rtpCapabilities) => { if (isInitiator(callId, socketId)) { videoCalls[callId].initiatorConsumerAudio = await videoCalls[callId].initiatorConsumerTransport.consume({ producerId: videoCalls[callId].receiverAudioProducer.id, rtpCapabilities, paused: true, }); // https://mediasoup.org/documentation/v3/mediasoup/api/#consumer-on-transportclose videoCalls[callId].initiatorConsumerAudio.on('transportclose', () => { const callId = socketDetails[socket.id]; console.log('transport close from consumer', callId); closeCall(callId); }); // https://mediasoup.org/documentation/v3/mediasoup/api/#consumer-on-producerclose videoCalls[callId].initiatorConsumerAudio.on('producerclose', () => { const callId = socketDetails[socket.id]; console.log('producer of consumer closed', callId); closeCall(callId); }); return { id: videoCalls[callId].initiatorConsumerAudio.id, producerId: videoCalls[callId].receiverAudioProducer.id, kind: 'audio', rtpParameters: videoCalls[callId].initiatorConsumerAudio.rtpParameters, }; } else { videoCalls[callId].receiverConsumerAudio = await videoCalls[callId].receiverConsumerTransport.consume({ producerId: videoCalls[callId].initiatorAudioProducer.id, rtpCapabilities, paused: true, }); videoCalls[callId].receiverConsumerAudio.on('transportclose', () => { const callId = socketDetails[socket.id]; console.log('transport close from consumer', callId); closeCall(callId); }); videoCalls[callId].receiverConsumerAudio.on('producerclose', () => { const callId = socketDetails[socket.id]; console.log('producer of consumer closed', callId); closeCall(callId); }); return { id: videoCalls[callId].receiverConsumerAudio.id, producerId: videoCalls[callId].initiatorAudioProducer.id, kind: 'audio', rtpParameters: videoCalls[callId].receiverConsumerAudio.rtpParameters, }; } }; const isInitiator = (callId, socketId) => { return videoCalls[callId]?.initiatorSocket?.id === socketId; }; /* - Called from at event 'createWebRtcTransport' and assigned to the consumer or producer transport - It will return parameters, these are required for the client to create the RecvTransport from the client. - If the client is producer(sender: true) then it will use parameters for device.createSendTransport(params) - If the client is a consumer(sender: false) then it will use parameters for device.createRecvTransport(params) */ const createWebRtcTransportLayer = async (callId, callback) => { try { console.log('[createWebRtcTransportLayer] callId', callId); // https://mediasoup.org/documentation/v3/mediasoup/api/#WebRtcTransportOptions const webRtcTransport_options = { listenIps: [ { ip: process.env.IP, // Listening IPv4 or IPv6. announcedIp: process.env.ANNOUNCED_IP, // Announced IPv4 or IPv6 (useful when running mediasoup behind NAT with private IP). }, ], enableUdp: true, enableTcp: true, preferUdp: true, }; // https://mediasoup.org/documentation/v3/mediasoup/api/#router-createWebRtcTransport let transport = await videoCalls[callId].router.createWebRtcTransport(webRtcTransport_options); // Handler for when DTLS(Datagram Transport Layer Security) changes transport.on('dtlsstatechange', (dtlsState) => { console.log(`transport | dtlsstatechange | calldId ${callId} | dtlsState ${dtlsState}`); if (dtlsState === 'closed') { transport.close(); } }); // Handler if the transport layer has closed (for various reasons) transport.on('close', () => { console.log(`transport | closed | calldId ${callId}`); }); const params = { id: transport.id, iceParameters: transport.iceParameters, iceCandidates: transport.iceCandidates, dtlsParameters: transport.dtlsParameters, }; console.log('[createWebRtcTransportLayer] callback params', params); // Send back to the client the params callback({ params }); // Set transport to producerTransport or consumerTransport return transport; } catch (error) { console.log(`ERROR | createWebRtcTransportLayer | callId ${socketDetails[socket.id]} | ${error.message}`); callback({ params: { error } }); } };