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----
-title: AudioContext.createScriptProcessor()
-slug: Web/API/AudioContext/createScriptProcessor
-translation_of: Web/API/BaseAudioContext/createScriptProcessor
----
-<p>{{ APIRef("Web Audio API") }}</p>
-
-<div>
-<p>{{ domxref("AudioContext") }} 接口的<code>createScriptProcessor()</code> 方法创建一个{{domxref("ScriptProcessorNode")}} 用于通过JavaScript直接处理音频.</p>
-</div>
-
-<h2 id="语法">语法</h2>
-
-<pre class="brush: js">var audioCtx = new AudioContext();
-myScriptProcessor = audioCtx.createScriptProcessor(<code>bufferSize</code>, <code>numberOfInputChannels</code>, <code>numberOfOutputChannels</code>);</pre>
-
-<h3 id="Parameters" name="Parameters">参数</h3>
-
-<dl>
- <dt><code>bufferSize</code></dt>
- <dd>缓冲区大小，以样本帧为单位。具体来讲，缓冲区大小必须是下面这些值当中的某一个: 256, 512, 1024, 2048, 4096, 8192, 16384. 如果不传，或者参数为0，则取当前环境最合适的缓冲区大小, 取值为2的幂次方的一个常数，在该node的整个生命周期中都不变.</dd>
- <dd>该取值控制着<code>audioprocess事件被分派的频率，以及每一次调用多少样本帧被处理</code>. 较低bufferSzie将导致一定的延迟。较高的bufferSzie就要注意避免音频的崩溃和故障。推荐作者不要给定具体的缓冲区大小，让系统自己选一个好的值来平衡延迟和音频质量。</dd>
- <dt><code>numberOfInputChannels</code></dt>
- <dd>值为整数，用于指定输入node的声道的数量，默认值是2，最高能取32.</dd>
- <dt><code>numberOfOutputChannels</code></dt>
- <dd>值为整数，用于指定输出node的声道的数量，默认值是2，最高能取32.</dd>
-</dl>
-
-<div class="warning">
-<p><span style="font-size: 14px;"><strong>重要</strong></span>: Webkit (version 31)要求调用这个方法的时候必须传入一个有效的bufferSize .</p>
-</div>
-
-<div class="note">
-<p><span style="font-size: 14px;"><strong>注意</strong></span>: <code>numberOfInputChannels<font face="Open Sans, Arial, sans-serif">和</font></code><code>numberOfOutputChannels的值不能同时为0，二者同时为0是无效的</code></p>
-</div>
-
-<h3 id="Description" name="Description">返回</h3>
-
-<p>A {{domxref("ScriptProcessorNode")}}.</p>
-
-<h2 id="示例">示例</h2>
-
-<p><code><font face="Open Sans, Arial, sans-serif">下面的例子展示了一个</font>ScriptProcessorNode的基本用法，数据源取自</code> {{ domxref("AudioContext.decodeAudioData") }}, 给每一个音频样本加一点白噪声，然后通过{{domxref("AudioDestinationNode")}}播放(其实这个就是系统的扬声器)。 对于每一个声道和样本帧，在把结果当成输出样本之前，<code>scriptNode.onaudioprocess方法<font face="Open Sans, Arial, sans-serif">关联</font></code><code>audioProcessingEvent</code> ，并用它来遍历每输入流的每一个声道，和每一个声道中的每一个样本，并添加一点白噪声。</p>
-
-<div class="note">
-<p><span style="font-size: 14px;"><strong>注意</strong></span>: 完整的示例参照 <a href="https://mdn.github.io/webaudio-examples/script-processor-node/">script-processor-node</a> github (查看源码 <a href="https://github.com/mdn/webaudio-examples/blob/master/script-processor-node/index.html">source code</a>.)</p>
-</div>
-
-<pre class="brush: js">var myScript = document.querySelector('script');
-var myPre = document.querySelector('pre');
-var playButton = document.querySelector('button');
-
-// Create AudioContext and buffer source
-var audioCtx = new AudioContext();
-source = audioCtx.createBufferSource();
-
-// Create a ScriptProcessorNode with a bufferSize of 4096 and a single input and output channel
-var scriptNode = audioCtx.createScriptProcessor(4096, 1, 1);
-console.log(scriptNode.bufferSize);
-
-// load in an audio track via XHR and decodeAudioData
-
-function getData() {
-  request = new XMLHttpRequest();
-  request.open('GET', 'viper.ogg', true);
-  request.responseType = 'arraybuffer';
-  request.onload = function() {
-    var audioData = request.response;
-
-    audioCtx.decodeAudioData(audioData, function(buffer) {
-    myBuffer = buffer;
-    source.buffer = myBuffer;
-  },
-    function(e){"Error with decoding audio data" + e.err});
-  }
-  request.send();
-}
-
-// Give the node a function to process audio events
-scriptNode.onaudioprocess = function(audioProcessingEvent) {
-  // The input buffer is the song we loaded earlier
-  var inputBuffer = audioProcessingEvent.inputBuffer;
-
-  // The output buffer contains the samples that will be modified and played
-  var outputBuffer = audioProcessingEvent.outputBuffer;
-
-  // Loop through the output channels (in this case there is only one)
-  for (var channel = 0; channel &lt; outputBuffer.numberOfChannels; channel++) {
-    var inputData = inputBuffer.getChannelData(channel);
-    var outputData = outputBuffer.getChannelData(channel);
-
-    // Loop through the 4096 samples
-    for (var sample = 0; sample &lt; inputBuffer.length; sample++) {
-      // make output equal to the same as the input
-      outputData[sample] = inputData[sample];
-
-      // add noise to each output sample
-      outputData[sample] += ((Math.random() * 2) - 1) * 0.2;
-    }
-  }
-}
-
-getData();
-
-// wire up play button
-playButton.onclick = function() {
-  source.connect(scriptNode);
-  scriptNode.connect(audioCtx.destination);
-  source.start();
-}
-
-// When the buffer source stops playing, disconnect everything
-source.onended = function() {
-  source.disconnect(scriptNode);
-  scriptNode.disconnect(audioCtx.destination);
-}
-</pre>
-
-<h2 id="规范">规范</h2>
-
-<table class="standard-table">
- <tbody>
-  <tr>
-   <th scope="col">Specification</th>
-   <th scope="col">Status</th>
-   <th scope="col">Comment</th>
-  </tr>
-  <tr>
-   <td>{{SpecName('Web Audio API', '#widl-AudioContext-createScriptProcessor-ScriptProcessorNode-unsigned-long-bufferSize-unsigned-long-numberOfInputChannels-unsigned-long-numberOfOutputChannels', 'createScriptProcessor')}}</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>
-
-<div>{{CompatibilityTable}}</div>
-
-<div id="compat-desktop">
-<table class="compat-table">
- <tbody>
-  <tr>
-   <th>Feature</th>
-   <th>Chrome</th>
-   <th>Edge</th>
-   <th>Firefox (Gecko)</th>
-   <th>Internet Explorer</th>
-   <th>Opera</th>
-   <th>Safari (WebKit)</th>
-  </tr>
-  <tr>
-   <td>Basic support</td>
-   <td>{{CompatChrome(10.0)}}{{property_prefix("webkit")}}</td>
-   <td>{{CompatVersionUnknown}}</td>
-   <td>{{CompatGeckoDesktop(25.0)}} </td>
-   <td>{{CompatNo}}</td>
-   <td>15.0{{property_prefix("webkit")}}<br>
-    22 (unprefixed)</td>
-   <td>6.0{{property_prefix("webkit")}}</td>
-  </tr>
- </tbody>
-</table>
-</div>
-
-<div id="compat-mobile">
-<table class="compat-table">
- <tbody>
-  <tr>
-   <th>Feature</th>
-   <th>Android</th>
-   <th>Edge</th>
-   <th>Firefox Mobile (Gecko)</th>
-   <th>Firefox OS</th>
-   <th>IE Mobile</th>
-   <th>Opera Mobile</th>
-   <th>Safari Mobile</th>
-   <th>Chrome for Android</th>
-  </tr>
-  <tr>
-   <td>Basic support</td>
-   <td>{{CompatUnknown}}</td>
-   <td>{{CompatVersionUnknown}}</td>
-   <td>26.0</td>
-   <td>1.2</td>
-   <td>{{CompatUnknown}}</td>
-   <td>{{CompatUnknown}}</td>
-   <td>{{CompatUnknown}}</td>
-   <td>33.0</td>
-  </tr>
- </tbody>
-</table>
-</div>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li><a href="/en-US/docs/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
-</ul>