forked from Supositware/Haha-Yes
56 lines
1.7 KiB
JavaScript
56 lines
1.7 KiB
JavaScript
'use strict';
|
|
// replace username and password with speech to text credentials
|
|
// audio.wav can be found here: https://github.com/watson-developer-cloud/nodejs-wrapper/blob/master/test/resources/audio.wav?raw=true
|
|
|
|
var fs = require('fs');
|
|
var opus = require('node-opus');
|
|
var ogg = require('ogg');
|
|
var cp = require('child_process');
|
|
|
|
var oggDecoder = new ogg.Decoder();
|
|
|
|
oggDecoder.on('stream', function (stream) {
|
|
|
|
var opusDecoder = new opus.Decoder();
|
|
|
|
// the "format" event contains the raw PCM format
|
|
opusDecoder.on('format', function (format) {
|
|
|
|
// format example:
|
|
//{
|
|
// channels: 1,
|
|
// sampleRate: 24000,
|
|
// bitDepth: 16,
|
|
// float: false,
|
|
// signed: true,
|
|
// gain: 0,
|
|
// preSkip: 156,
|
|
// version: 1
|
|
//}
|
|
|
|
// convert the signed & bitDepth to an alsa compatible format (`aplay --help format` for full list)
|
|
var alsaFormat;
|
|
if (format.signed && format.bitDepth == 16) {
|
|
alsaFormat = 'S16_LE'; // assume Little Endian
|
|
} else {
|
|
throw new Error('unexpected format: ' + JSON.stringify(format));
|
|
}
|
|
|
|
// set up aplay to accept data from stdin
|
|
var aplay = cp.spawn('aplay',['--format=' + alsaFormat, '--rate=' + format.sampleRate, '--channels='+format.channels, '--']);
|
|
|
|
// send the raw PCM data to aplay
|
|
opusDecoder.pipe(aplay.stdin);
|
|
|
|
// or pipe to node-speaker, a file, etc
|
|
});
|
|
|
|
// an "error" event will get emitted if the stream is not a Vorbis stream
|
|
// (i.e. it could be a Theora video stream instead)
|
|
opusDecoder.on('error', console.error);
|
|
|
|
stream.pipe(opusDecoder);
|
|
});
|
|
|
|
|
|
fs.createReadStream('input.opus').pipe(oggDecoder);
|