https://github.com/jaz303/bitcrusher

Bitcrush effect for Web Audio API
https://github.com/jaz303/bitcrusher

Last synced: 3 days ago
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Bitcrush effect for Web Audio API

• Host: GitHub
• URL: https://github.com/jaz303/bitcrusher
• Owner: jaz303
• License: isc
• Created: 2014-03-25T15:25:52.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2014-08-12T21:42:34.000Z (over 10 years ago)
• Last Synced: 2024-08-09T21:23:02.154Z (3 months ago)
• Language: JavaScript
• Size: 246 KB
• Stars: 35
• Watchers: 5
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# bitcrusher

Implementation of a bit-crush effect using the Web Audio API.

## Installation

Browserify is recommended; alternatively you can grab a UMD module from the `build` directory. If using `npm`:

    $ npm install bitcrusher

## Usage

```javascript

var bitcrusher = require('bitcrusher');

var audioContext = window.createAudioContext();

var bitcrushNode = bitcrush(audioContext, {

    bitDepth: 6,

    frequency: 0.5

});

var mySource = // ... create audio source

mySource.connect(bitcrushNode);

bitcrushNode.connect(audioContext.destination);

```

## API

#### `bitcrusher(audioContext, opts)`

Create a new bitcrusher in the Web Audio Context `audioContext` configured with the supplied options:

  * `bufferSize`: defaults to 4096

  * `channelCount`: defaults to 2

  * `bitDepth`: output resolution, defaults to 8

  * `frequency`: sample-and-hold ratio; used to reduce the perceived output frequency. Defaults to 1 (no change).

Returns a `ScriptProcessorNode` configured with a bitcrush effect.

## Reference

If you're running OS X, open `graph.gcx` in `Grapher.app` to visualise the algorithm.

## TODO

`bitDepth` and `frequency` options would ideally instances of `AudioParam`. Unfortunately the Web Audio API does not yet allow standalone instances to be created.