AudioBuffer.copyFromChannel

The copyFromChannel() method of the AudioBuffer interface copies the samples from the specified channel of the AudioBuffer to the destination array.

Syntax

myArrayBuffer.copyFromChannel(destination, channelNumber, startInChannel);

Parameters

destination

A Float32Array to copy the channel data to.

channelNumber

The channel number of the current AudioBuffer to copy the channel data from. If channelNumber is greater than or equal toAudioBuffer.numberOfChannels, an INDEX_SIZE_ERR will be thrown.

startInChannel Optional

An optional offset to copy the data from. If startInChannel is greater than AudioBuffer.length, an INDEX_SIZE_ERR will be thrown.

Return value

Void.

Example

var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);  
var anotherArray = new Float32Array;
myArrayBuffer.copyFromChannel(anotherArray, 1, 0);

Specification

Browser compatibility

See also

• Using the Web Audio API