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.
createChannelSplitter(numberOfOutputs)
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);
var gainNode = ac.createGain();
gainNode.gain.setValueAtTime(0.5, ac.currentTime);
splitter.connect(gainNode, 0);
gainNode.connect(merger, 0, 1);
splitter.connect(merger, 1, 0);
var dest = ac.createMediaStreamDestination();
merger.connect(dest);
});