ChannelSplitterNode

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.

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.

Number of inputs 1
Number of outputs variable; default to 6 .
Channel count mode "explicit " Older implementations, as per earlier versions of the spec use "max" .
Channel count Fixed to the number of outputs. Older implementations, as per earlier versions of the spec use 2 (not used in the default count mode).
Channel interpretation "discrete"

构造函数

ChannelSplitterNode()
创建新的 ChannelSplitterNode object instance.

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 Comment
Web 音频 API
The definition of 'ChannelSplitterNode' in that specification.
工作草案

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
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 is set to 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 is set to 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 is set to 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 is set to 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 is set to 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 is set to 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

图例

完整支持
完整支持
不支持
不支持
兼容性未知
兼容性未知
见实现注意事项。

另请参阅