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AudioContext.createChannelSplitter()
The createChannelSplitter() method of the AudioContext Interface is used to create a ChannelSplitterNode, which is used to access the individual channels of an audio stream and process them separately.
Syntax
js
var audioCtx = new AudioContext();
var splitter = audioCtx.createChannelSplitter(2);
参数
- numberOfOutputs
-
你期待将输入音频分割成的声道道数目; 当不传入参数时,默认为 6
Returns
Example
下面这个简单的例子告诉你怎样分割一个双声道音轨 (或者说一段音乐), 以及对于左右声道不同的处理。要使用它们,你需要用到AudioNode.connect(AudioNode)方法的第二个和第三个参数,他们会指定链接声道源的序号和链接到的声道序号。
js
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.value = 0.5;
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);
});
规格
| 规范 |
|---|
| Web Audio API # dom-baseaudiocontext-createchannelsplitter |
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