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---
title: AudioContext.createChannelSplitter()
slug: Web/API/BaseAudioContext/createChannelSplitter
translation_of: Web/API/BaseAudioContext/createChannelSplitter
original_slug: Web/API/AudioContext/createChannelSplitter
---
<p>{{ APIRef("Web Audio API") }}</p>
<div>
<p>The <code>createChannelSplitter()</code> method of the {{ domxref("AudioContext") }} Interface is used to create a {{domxref("ChannelSplitterNode")}}, which is used to access the individual channels of an audio stream and process them separately.</p>
</div>
<h2 id="Syntax">Syntax</h2>
<pre class="brush: js">var audioCtx = new AudioContext();
var splitter = audioCtx.createChannelSplitter(2);</pre>
<h3 id="参数">参数</h3>
<dl>
<dt>numberOfOutputs</dt>
<dd>你期待将输入音频分割成的声道道数目; 当不传入参数时，默认为6</dd>
</dl>
<h3 id="Returns">Returns</h3>
<p>一个 {{domxref("ChannelSplitterNode")}}.</p>
<h2 id="Example">Example</h2>
<p>下面这个简单的例子告诉你怎样分割一个双声道音轨 (或者说一段音乐), 以及对于左右声道不同的处理. 要使用它们, 你需要用到{{domxref("AudioNode.connect(AudioNode)") }}方法的第二个和第三个参数, 他们会指定链接声道源的序号和链接到的声道序号.</p>
<pre class="brush: js;highlight[5,12,17]">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);
});</pre>
<h2 id="规格">规格</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">规格</th>
<th scope="col">状态</th>
<th scope="col">注释</th>
</tr>
<tr>
<td>{{SpecName('Web Audio API', '#widl-AudioContext-createChannelSplitter-ChannelSplitterNode-unsigned-long-numberOfOutputs', 'createChannelSplitter()')}}</td>
<td>{{Spec2('Web Audio API')}}</td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
{{Compat("api.BaseAudioContext.createChannelSplitter")}}
<h2 id="另见">另见</h2>
<ul>
<li><a href="/en-US/docs/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
</ul>
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