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