ChannelMergerNode

ChannelMergerNode interface, often used in conjunction with its opposite, ChannelSplitterNode , reunites different mono inputs into a single output. Each input is used to fill a channel of the output. This is useful for accessing each channels separately, e.g. for performing channel mixing where gain must be separately controlled on each channel.

ChannelMergerNode has one single output, but as many inputs as there are channels to merge; the number of inputs is defined as a parameter of its constructor and the call to AudioContext.createChannelMerger . In the case that no value is given, it will default to 6 .

Using a ChannelMergerNode , it is possible to create outputs with more channels than the rendering hardware is able to process. In that case, when the signal is sent to the AudioContext.listener object, supernumerary channels will be ignored.

Number of inputs variable; default to 6 .
Number of outputs 1
Channel count mode "max"
Channel count 2 (not used in the default count mode)
Channel interpretation "speakers"

构造函数

ChannelMergerNode()
创建新的 ChannelMergerNode 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 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 both 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 'ChannelMergerNode' 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
ChannelMergerNode Chrome 14 Edge ≤18 Firefox 25 IE 不支持 No Opera 15 Safari 6 WebView Android Yes Chrome Android 18 Firefox Android 26 Opera Android 14 Safari iOS Yes Samsung Internet Android 1.0
ChannelMergerNode() 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

另请参阅