cruncher/audioparam

Instantiate a real web audio API AudioParam

AudioParam

With the current Web Audio API version, you cannot instantiate AudioParam.

This library implements a simple hack that allows you to instantiate a real AudioParam which you can then use to build custom audio nodes with ScriptProcessorNode.

Usage

note : a full example is available here.

Download the latest stable release from dist/, and put the file in your webpage. Then create an AudioParam like so :

var myAudioParam = new AudioParam(audioContext, defaultValue)

The created AudioParam provides a method AudioParam.connect(node, input), which allows you to connect it to a node. For example :

var param = new AudioParam(audioContext, 0.5)
  , customProcess = audioContext.createScriptProcessor(256, 3, 1)
  , channelMerger = audioContext.createChannelMerger(2)
  , paramData, audioSourceData

someAudioSource.connect(channelMerger, 0, 0)
param.connect(channelMerger, 1)

customProcess.onaudioprocess = function(event) {
  audioSourceData = event.inputBuffer.getChannelData(0)
  paramData = event.inputBuffer.getChannelData(1)
  // YOUR CUSTOM PROCESS HERE
}

customProcess.param = param