linx-simulator2/node_modules/lame/examples/wav2mp3.js

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2019-09-18 08:11:16 +00:00
/**
* Here's a clone of the popular "wav2mp3" program, but using node-lame and
* node-wav.
*/
var fs = require('fs');
var lame = require('../');
var wav = require('wav');
var filename = process.argv[2];
if (process.stdin.isTTY && !filename) {
// print help
console.error('usage:');
console.error(' encode a wav file:');
console.error(' $ %s <infile.wav> <outfile.mp3>', process.argv.join(' '));
console.error(' or encode a wav from stdin:');
console.error(' $ cat song.wav | %s | mpg123 -', process.argv.join(' '));
process.exit(1);
}
// first figure out if we're encoding from a filename, or from stdin
var input;
var output;
if (filename) {
var outfile = process.argv[3];
if (!outfile) {
console.error('FATAL: must specify an output mp3 file!');
process.exit(1);
}
console.error('encoding %j', filename);
console.error('to %j', outfile);
input = fs.createReadStream(filename);
output = fs.createWriteStream(outfile);
} else {
input = process.stdin;
output = process.stdout;
}
// start reading the WAV file from the input
var reader = new wav.Reader();
// we have to wait for the "format" event before we can start encoding
reader.on('format', onFormat);
// and start transferring the data
input.pipe(reader);
function onFormat (format) {
console.error('WAV format: %j', format);
// encoding the wave file into an MP3 is as simple as calling pipe()
var encoder = new lame.Encoder(format);
reader.pipe(encoder).pipe(output);
}