ChannelSplitterNode

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ChannelSplitterNode interface, often used in conjunction with its opposite, ChannelMergerNode , separates the different channels of an audio source into a set of mono outputs. This is useful for accessing each channel separately, e.g. for performing channel mixing where gain must be separately controlled on each channel.

若 ChannelSplitterNode always has one single input, the amount of outputs is defined by a parameter on its constructor and the call to AudioContext.createChannelSplitter() . In the case that no value is given, it will default to 6 . If there are fewer channels in the input than there are outputs, supernumerary outputs are silent.

输入数	`1`
输出数	variable; default to `6` .
通道计数模式	`"explicit` " Older implementations, as per earlier versions of the spec use `"max"` .
通道计数	Fixed to the number of outputs. Older implementations, as per earlier versions of the spec use `2` (not used in the default count mode).
通道解释	`"discrete"`

构造函数

ChannelSplitterNode(): 创建新的 ChannelSplitterNode 对象实例。

特性

No specific property; inherits properties from its parent, AudioNode .

方法

No specific method; inherits methods from its parent, AudioNode .

范例

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);
});

规范

规范	状态	注释
Web 音频 API The definition of 'ChannelSplitterNode' in that specification.	工作草案

浏览器兼容性

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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`ChannelSplitterNode`	Chrome 14 注意事项 14 注意事项 Starting in Chrome 56, `channelCountMode` 被设为 `explicit` and `channelCount` is fixed to the number of outputs, as per the latest spec.	Edge ≤18	Firefox 25	IE 不支持 No	Opera 15 注意事项 15 注意事项 Starting in Opera 43, `channelCountMode` 被设为 `explicit` and `channelCount` is fixed to the number of outputs, as per the latest spec.	Safari 6	WebView Android Yes 注意事项 Yes 注意事项 Starting in version 56, `channelCountMode` 被设为 `explicit` and `channelCount` is fixed to the number of outputs, as per the latest spec.	Chrome Android 18 注意事项 18 注意事项 Starting in Chrome 56, `channelCountMode` 被设为 `explicit` and `channelCount` is fixed to the number of outputs, as per the latest spec.	Firefox Android 26	Opera Android 14 注意事项 14 注意事项 Starting in Opera 43, `channelCountMode` 被设为 `explicit` and `channelCount` is fixed to the number of outputs, as per the latest spec.	Safari iOS Yes	Samsung Internet Android 1.0 注意事项 1.0 注意事项 Starting in Samsung Internet 6.0, `channelCountMode` 被设为 `explicit` and `channelCount` is fixed to the number of outputs, as per the latest spec.
`ChannelSplitterNode()` 构造函数	Chrome 55	Edge ≤79	Firefox 53	IE 不支持 No	Opera 42	Safari ?	WebView Android 55	Chrome Android 55	Firefox Android 53	Opera Android 42	Safari iOS ?	Samsung Internet Android 6.0

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使用 Web 音频 API

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最后修改： 2020 年 1 月 22 日

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