dynamicaudio.js

An interface for writing audio with Firefox's new audio data API with a Flash fallback for older browsers.

Built packages can be downloaded from GitHub.

For a basic example, see demo.html.

Usage

First, instantiate a DynamicAudio object with a dictionary of options:

var dynamicaudio = new DynamicAudio({'swf': '/static/dynamicaudio.swf'})

The swf option specifies the path of the dynamicaudio.swf file relative to the page being displayed.

The DynamicAudio object has two methods available on it:

write(samples)

Plays an array of floating point audio samples in the range -1.0 to 1.0.

They are output as 2 channels at 44.1 KHz. This means it takes 88,200 samples to play 1 second of audio. You do not need to supply this many samples in a single call, but if you don't call write() often enough with enough samples, you will get buffer underruns.

writeInt(samples)

This method is the same as write(), but is instead supplied with integer samples in the range -32,768 to 32,767. If your samples are already integers, this method is more efficient.

Build from source

To build, you will need jake:

$ sudo gem install jake

You will also need Adobe's Flex SDK. This should be placed in a flexsdk directory in the same directory as jake.yml.

Now run:

$ jake