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+---
+title: AudioContext.createMediaStreamDestination()
+slug: Web/API/AudioContext/createMediaStreamDestination
+translation_of: Web/API/AudioContext/createMediaStreamDestination
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<div>
+<p>{{ domxref("AudioContext") }}接口的<code>createMediaStreamDestination()方法用于创建一个新的对象，该对象关联着表示音频流的一个</code> <a href="/en-US/docs/WebRTC">WebRTC</a> {{domxref("MediaStream")}} ,音频流可以存储在本地文件或者被发送到另外一台计算机.</p>
+</div>
+
+<p>The {{domxref("MediaStream")}} is created when the node is created and is accessible via the {{domxref("MediaStreamAudioDestinationNode")}}'s <code>strea<dfn>m</dfn></code> attribute. This stream can be used in a similar way as a <code>MediaStream</code> obtained via {{domxref("navigator.getUserMedia") }} — it can, for example, be sent to a remote peer using the <code>RTCPeerConnection</code> <code>addStream()</code> method.</p>
+
+<p>For more details about media stream destination nodes, check out the {{domxref("MediaStreamAudioDestinationNode")}} reference page.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var audioCtx = new AudioContext();
+var destination = audioCtx.createMediaStreamDestination();</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>A {{domxref("MediaStreamAudioDestinationNode")}}.</p>
+
+<h2 id="Example">Example</h2>
+
+<p>In the following simple example, we create a {{domxref("MediaStreamAudioDestinationNode")}}, an {{ domxref("OscillatorNode") }} and a {{ domxref("MediaRecorder") }} (the example will therefore only work in Firefox at this time.) The <code>MediaRecorder</code> is set up to record information from the <code>MediaStreamDestinationNode</code>.</p>
+
+<p>When the button is clicked, the oscillator starts, and the <code>MediaRecorder</code> is started. When the button is stopped, the oscillator and<code> MediaRecorder</code> both stop. Stopping the <code>MediaRecorder</code> causes the <code>dataavailable</code> event to fire, and the event data is pushed into the <code>chunks</code> array. After that, the <code>stop</code> event fires, a new <code>blob</code> is made of type opus — which contains the data in the <code>chunks</code> array, and a new window (tab) is then opened that points to a URL created from the blob.</p>
+
+<p>From here, you can play and save the opus file.</p>
+
+<pre class="brush: html;highlight[17]">&lt;!DOCTYPE html&gt;
+&lt;html&gt;
+  &lt;head&gt;
+    &lt;title&gt;createMediaStreamDestination() demo&lt;/title&gt;
+  &lt;/head&gt;
+  &lt;body&gt;
+    &lt;h1&gt;createMediaStreamDestination() demo&lt;/h1&gt;
+
+    &lt;p&gt;Encoding a pure sine wave to an Opus file &lt;/p&gt;
+    &lt;button&gt;Make sine wave&lt;/button&gt;
+    &lt;audio controls&gt;&lt;/audio&gt;
+    &lt;script&gt;
+     var b = document.querySelector("button");
+     var clicked = false;
+     var chunks = [];
+     var ac = new AudioContext();
+     var osc = ac.createOscillator();
+     var dest = ac.createMediaStreamDestination();
+     var mediaRecorder = new MediaRecorder(dest.stream);
+     osc.connect(dest);
+
+     b.addEventListener("click", function(e) {
+       if (!clicked) {
+           mediaRecorder.start();
+           osc.start(0);
+           e.target.innerHTML = "Stop recording";
+           clicked = true;
+         } else {
+           mediaRecorder.stop();
+           osc.stop(0);
+           e.target.disabled = true;
+         }
+     });
+
+     mediaRecorder.ondataavailable = function(evt) {
+       // push each chunk (blobs) in an array
+       chunks.push(evt.data);
+     };
+
+     mediaRecorder.onstop = function(evt) {
+       // Make blob out of our blobs, and open it.
+       var blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
+       document.querySelector("audio").src = URL.createObjectURL(blob);
+     };
+    &lt;/script&gt;
+  &lt;/body&gt;
+&lt;/html&gt;</pre>
+
+<div class="note">
+<p><strong>Note</strong>: You can <a href="https://mdn.github.io/webaudio-examples/create-media-stream-destination/index.html">view this example live</a>, or <a href="https://github.com/mdn/webaudio-examples/blob/master/create-media-stream-destination/index.html">study the source code</a>, on Github.</p>
+</div>
+
+<h2 id="Specifications">Specifications</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-createMediaStreamDestination-MediaStreamAudioDestinationNode', 'createMediaStreamDestination()')}}</td>
+   <td>{{Spec2('Web Audio API')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</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>{{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>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>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>