libsamplerate.js

This is a port of libsamplerate (0.1.9) to pure JavaScript using Emscripten for use in a browser environment.

Usage

A JavaScript wrapper is provided for the Full API (not actually the full API).

Be aware that a resampler object is stateful, therefore one and only one resampler should be used for one and only one stream of audio data. Depending on the converter type, some audio is buffered internally and the stream must be flushed to output all of it.

Quick example usage:

var Resampler = require('libsamplerate.js')
 
var resampler = new Resampler({
  type: Resampler.Type.SINC_MEDIUM_QUALITY,
  ratio: 48000 / 41100, // output/input
  channels: 1,
  unsafe: false
});
 
// The resampler can be used directly
resampler.write(Buffer.from([0, 0, 0, 1, 0, 2]));
var result = resampler.read();
// or just like any other node stream
someRawInput.pipe(resampler).pipe(someOutputStream);
 
// Only required if unsafe is true and the stream will not end by itself
// resampler.destroy()

For detailed information, see lib/resampler.js.

Building from source

Prebuilt libsamplerate binaries are available in build/. Building these yourself is rather simple (assuming you have common build tools already installed):

1. Install Emscripten
2. Run make clean
3. Run make

License

The full license texts are available in LICENSE.md.

libsamplerate.js uses the MIT license while libsamplerate uses the 2-clause BSD license.