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




A Float32Array to copy the channel data to.
The channel number of the current AudioBuffer to copy the channel data from. If channelNumber is greater than or equal to AudioBuffer.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.


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


Specification Status Comment
Web Audio API
The definition of 'copyFromChannel' in that specification.
Working Draft  

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 14.0 webkit (Yes) 27 (27) No support 15 webkit
22 (unprefixed)
No support
Unprefixed 43.0 (Yes) ? ? ? No support
Feature Android Android Webview Edge Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support No support ? (Yes) 27.0 (27) 1.2 No support No support No support 28.0 webkit
Unprefixed No support No support (Yes) ? ? ? ? No support 43.0

See also

Document Tags and Contributors

 Contributors to this page: erikadoyle, halfbyte, jpmedley, eharris, fscholz, teoli, chrisdavidmills
 Last updated by: erikadoyle,