AudioContext.createChannelMerger()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2021.

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AudioContext.createChannelMerger() 方法，会创建一个 ChannelMergerNode，后者可以把多个音频流的通道整合到一个音频流。

语法

js
var audioCtx = new AudioContext();
var merger = audioCtx.createChannelMerger(2);

参数

numberOfInputs

通道输入音频流的数量，输出流将包含这个数量的通道。默认值 6。

返回值

一个 ChannelMergerNode.

示例

下面的例子展示了如何分离立体音轨（就是一段音乐），处理使左右声道不同。使用的时候，需要指定 AudioNode.connect(AudioNode) 方法的第二个和第三个参数，分别用来指定通道链接来源的索引和输出的索引。

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);
});

规范

Specification
Web Audio API
# dom-baseaudiocontext-createchannelmerger

浏览器兼容性

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参见