56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
|
|
/**
|
|
* 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);
|
|
}
|