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CJOpus

Emscripten (C++/JavaScript) bindings for libopus

A module to encode PCM data to and decode PCM data from Opus.

Using

The lib folder includes a pre-compiled version. Requiring the Opus.js entrypoint file should be enough.

OpusEncoder

//Tries to mimic `node-opus` in syntax.
var encoder = new OpusEncoder( 48000, 2 );

OpusEncoder#encode(Buffer/TypedArray/Array)

var PCM = getPCMDataSomehow();
var encoded = encoder.encode( PCM );

OpusEncoder#decode(Buffer/TypedArray/Array)

var OPUS = getOPUSDataSomehow();
var decoded = encoder.decode( OPUS );

OpusEncoder#encodeUnsafe / OpusEncoder#decodeUnsafe

These two methods work just like the safe versions, however they don't do any error checking and they use .subarray() instead of .slice(). Because of this, it's a bit faster. It's relatively safe to use, just know that if an encoding error happens, it will return an empty Uint8Array (encode) or Int16Array (decode).

OpusEncoder#destroy()

encoder.destroy();

Since this is an Emscripten module (that also has to malloc), the memory also needs to be freed manually when finished. It's a small program, perhaps under 30KB of dynamically allocated memory, but that can add up.

Building

The required packages for building (under Debian-based distros) are:

  • git
  • build-essential
  • libtool
$ git clone --recursive https://github.com/izy521/CJOpus.git
$ cd CJOpus
$ make