The createChannelSplitter()
method of the BaseAudioContext
Interface is used to create a ChannelSplitterNode
, which is used to access the individual channels of an audio stream and process them separately.
Syntax
baseAudioContext.createChannelSplitter(numberOfOutputs);
Parameters
- numberOfOutputs
- The number of channels in the input audio stream that you want to output separately; the default is 6 if this parameter is not specified.
Returns
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 APIThe definition of 'createChannelSplitter()' in that specification. | Working Draft |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
createChannelSplitter
|
Chrome Full support 10 Full support 10 Prefixed' Implemented with the vendor prefix: webkit |
Edge
Full support ≤18 |
Firefox Full support 53 Full support 53 Notes' Originally implemented on |
IE
No support No |
Opera Full support 22 Full support 22 Full support 15 Prefixed' Implemented with the vendor prefix: webkit |
Safari Full support 6 Full support 6 Prefixed' Implemented with the vendor prefix: webkit |
WebView Android
Full support Yes |
Chrome Android
Full support 33 |
Firefox Android Full support 53 Full support 53 Notes' Originally implemented on |
Opera Android Full support 22 Full support 22 Full support 14 Prefixed' Implemented with the vendor prefix: webkit |
Safari iOS Full support 6 Full support 6 Prefixed' Implemented with the vendor prefix: webkit |
Samsung Internet Android
Full support 2.0 |
Legend
- Full support
- Full support
- No support
- No support
- See implementation notes.'
- See implementation notes.
- Requires a vendor prefix or different name for use.'
- Requires a vendor prefix or different name for use.
See also
BaseAudioContext.createChannelSplitter() by Mozilla Contributors is licensed under CC-BY-SA 2.5.