AudioContext.createJavaScriptNode()

This method is obsolete, and has been renamed to  AudioContext.createScriptProcessor. See also ScriptProcessorNode.

Syntax

AudioContext.createJavaScriptNode(bufferSize, numInputChannels, numOutputChannels)

Parameters

bufferSize

The buffer size must be in units of sample frames, i.e., one of: 256, 512, 1024, 2048, 4096, 8192, or 16384. It controls the frequency of callbacks asking for a buffer refill. Smaller sizes allow for lower latency and higher for better overall quality.

numInputChannels

The number of input channels in the audio stream.

numOutputChannels

The number of output channels in the audio stream.

Example

The following script illustrates the use of createJavaScriptNode():

SineWave = function(context) {
  var that = this;
  this.x = 0; // Initial sample number
  this.context = context;
  this.node = context.createJavaScriptNode(1024, 1, 1);
  this.node.onaudioprocess = function(e) { that.process(e) };
}

SineWave.prototype.process = function(e) {
  var data = e.outputBuffer.getChannelData(0);
  for (var i = 0; i < data.length; ++i) {
    data[i] = Math.sin(this.x++);
  }
}

SineWave.prototype.play = function() {
  this.node.connect(this.context.destination);
}

SineWave.prototype.pause = function() {
  this.node.disconnect();
}

See also

• Generating Tones with the Web Audio API
• Exploring the HTML5 Web Audio: visualizing sound