54 lines
1.7 KiB
Markdown
54 lines
1.7 KiB
Markdown
|
# 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:
|
||
|
|
```javascript
|
||
|
|
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.
|
||
|
|
|
||
|
|
[libsamplerate]: http://www.mega-nerd.com/SRC/
|
||
|
|
[Full API]: http://www.mega-nerd.com/SRC/api_full.html
|
||
|
|
[Emscripten]: http://emscripten.org/
|
||
|
|
[Install Emscripten]: http://kripken.github.io/emscripten-site/docs/getting_started/downloads.html
|