AudioContext.createChannelMerger()
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
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
(举个)栗(例)子
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。
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 | Status | Comment |
---|---|---|
Web Audio API createChannelMerger() |
Recommendation |
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