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The ChannelSplitterNode interface, often used in conjunction with its opposite, ChannelMergerNode, separates the different channels of an audio source into a set of mono outputs. This is useful for accessing each channel separately, e.g. for performing channel mixing where gain must be separately controlled on each channel.

If your ChannelSplitterNode always has one single input, the amount of outputs is defined by a parameter on its constructor and the call to AudioContext.createChannelSplitter(). In the case that no value is given, it will default to 6. If there are fewer channels in the input than there are outputs, supernumerary outputs are silent.

Number of inputs 1
Number of outputs variable; default to 6.
Channel count mode "explicit" Older implementations, as per earlier versions of the spec use "max".
Channel count Fixed to the number of outputs. Older implementations, as per earlier versions of the spec use 2 (not used in the default count mode).
Channel interpretation "discrete"

Constructor

ChannelSplitterNode()
Creates a new ChannelSplitterNode object instance.

Properties

No specific property; inherits properties from its parent, AudioNode.

Methods

No specific method; inherits methods from its parent, AudioNode.

Example

The following simple example shows how you could separate a stereo track (say, a piece of music), and process the left and right channel differently. To use them, you need to use the second and third parameters of the AudioNode.connect(AudioNode) method, which allow you to specify the index of the channel to connect from and the index of the channel to connect to.

var ac = new AudioContext();
ac.decodeAudioData(someStereoBuffer, function(data) {
 var source = ac.createBufferSource();
 source.buffer = data;
 var splitter = ac.createChannelSplitter(2);
 source.connect(splitter);
 var merger = ac.createChannelMerger(2);

 // Reduce the volume of the left channel only
 var gainNode = ac.createGain();
 gainNode.gain.setValueAtTime(0.5, ac.currentTime);
 splitter.connect(gainNode, 0);

 // Connect the splitter back to the second input of the merger: we
 // effectively swap the channels, here, reversing the stereo image.
 gainNode.connect(merger, 0, 1);
 splitter.connect(merger, 1, 0);

 var dest = ac.createMediaStreamDestination();

 // Because we have used a ChannelMergerNode, we now have a stereo
 // MediaStream we can use to pipe the Web Audio graph to WebRTC,
 // MediaRecorder, etc.
 merger.connect(dest);
});

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support 14
Notes
Full support 14
Notes
Notes Starting in Chrome 56, channelCountMode is set to explicit and channelCount is fixed to the number of outputs, as per the latest spec.
Edge Full support YesFirefox Full support 25IE No support NoOpera Full support 15
Notes
Full support 15
Notes
Notes Starting in Opera 43, channelCountMode is set to explicit and channelCount is fixed to the number of outputs, as per the latest spec.
Safari Full support 6WebView Android Full support Yes
Notes
Full support Yes
Notes
Notes Starting in version 56, channelCountMode is set to explicit and channelCount is fixed to the number of outputs, as per the latest spec.
Chrome Android Full support 18
Notes
Full support 18
Notes
Notes Starting in Chrome 56, channelCountMode is set to explicit and channelCount is fixed to the number of outputs, as per the latest spec.
Edge Mobile Full support YesFirefox Android Full support 26Opera Android Full support 15
Notes
Full support 15
Notes
Notes Starting in Opera 43, channelCountMode is set to explicit and channelCount is fixed to the number of outputs, as per the latest spec.
Safari iOS ? Samsung Internet Android Full support Yes
ChannelSplitterNode() constructorChrome Full support 55Edge ? Firefox Full support 53IE No support NoOpera Full support 42Safari ? WebView Android Full support 55Chrome Android Full support 55Edge Mobile ? Firefox Android Full support 53Opera Android Full support 42Safari iOS ? Samsung Internet Android Full support 6.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.

See also

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