fast-sound

A collection of emscripten-compiled libraries: opus and speexdsp. It's a low-level library, exposing the native Emscripten interface. You should be familiar with it.

Motivation:

• Use both encoder/decoder/resampler in a single bundle
• Compile latest libraries with latest emscripten
• Integrate libraries into existing building systems, such as Webpack or Browserify
• Enable WebAssembly support by default with a fallback to ASM.js
• Usage of the same assets in different projects for better caching
• Provide an ability to load either production or development build
• Ability to fork the library and use it as a dependency from a git repo

Install

npm install --save fast-sound

or

yarn add fast-sound

Usage

The library exposes the same interface as Emscripten MODULARIZE does.

Use

// require production build
const FastSound = requrie('fast-sound')

FastSound({}).then(function(lib) {
  const errReference = lib._malloc( 4 );
  const decoder = lib._opus_decoder_create( decoderSampleRate, numberOfChannels, errReference );
  lib._free( errReference );
});

The library loads asynchroniously either WASM binary file or ASM.js fallback. By default, it will look at the same folder as the original script. You can pass locateFile function to correctly resolve paths:

function locateFile(file) {
  return "/assemblies/" + file;
}

FastSound({locateFile: locateFile}).then(function(lib) {
   // ...
});

All options passed to FastSound goes to Emscripten without a change. The only difference is method option, which can be wasm either asm.js. It forces the selected method:

// Loads ASM.js despite the WebAssembly browser support
FastSound({method: 'asm.js'}).then(function(lib) {
   // ...
});

For development build require the library as further:

// require development build
const FastSound = requrie('fast-sound/unminified')

Current build

There is both production and development builds:

• Compiled with emscripten 1.39.18-fastcomp (released 13th of Jun 2020)
• encoder/decoder from opus v1.3.1 (released 13th of Apr 2019)
• a resampler from speexdsp v1.2.0 (released 29th of May 2019)

Credits

• Based on https://github.com/chris-rudmin/opus-recorder