opus-encode

#opus-encode

Encode audio buffer streams to ogg opus. AFAIK, this only works in the browser.

##Installation

npm install --save opus-encode

##Usage

var concat = require('concat-stream');
var encode = require('opus-encode');
var stream = require('stream');

// request an audio file
var req = new XMLHttpRequest();
req.open('GET', '/path/to/file.wav', true);
req.responseType = 'arraybuffer';

req.onload = function () {
var res = req.response;
var ctx = new AudioContext();

// decode the file to audio buffers
ctx.decodeAudioData(res, function (buf) {
var audio = new stream.Readable({objectMode: true});

// convert the audio buffers to an object stream
audio._read = function () {
this.push(buf);
this.push(null);
};

// create a stream that concats all encoded data
var doSomething = concat(function (buf) {
// this blob contains the ogg opus encoded audio
var blob = new Blob([buf.toArrayBuffer()]);
});

audio.pipe(encode()).pipe(doSomething);
});
};

req.send();

##Disclaimer

I don't pretend to understand how the encoder actually works.
I modified the encoder written by chris-rudmin in his fork of RecordJS.

##Tests

In order to run tests in the browser make sure you open your browser with the following flag:

--allow-file-access-from-files