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+---
+title: MediaSource.addSourceBuffer()
+slug: Web/API/MediaSource/addSourceBuffer
+translation_of: Web/API/MediaSource/addSourceBuffer
+---
+<div>{{APIRef("Media Source Extensions")}}{{SeeCompatTable}}</div>
+
+<p>{{domxref("MediaSource")}} 的 <code><strong>addSourceBuffer()</strong></code> 方法会根据给定的 MIME 类型创建一个新的 {{domxref("SourceBuffer")}} 对象，然后会将它追加到 <code>MediaSource 的</code> {{domxref("SourceBuffers")}} 列表中。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var sourceBuffer = mediaSource.addSourceBuffer(mimeType);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>mimeType</dt>
+ <dd>你想创建的 source buffer 的 MIME 类型。</dd>
+</dl>
+
+<h3 id="返回">返回</h3>
+
+<p>一个 {{domxref("SourceBuffer")}} 对象。</p>
+
+<h3 id="错误（_Errors_）">错误（ Errors ）</h3>
+
+<p>下面的错误可能会在调用该方法时被抛出。</p>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Error</th>
+   <th scope="col">Explanation</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>InvalidAccessError</code></td>
+   <td>提交的 <code>mimeType</code> 是一个空字符串。</td>
+  </tr>
+  <tr>
+   <td><code>InvalidStateError</code></td>
+   <td>{{domxref("MediaSource.readyState")}} 的值不等于 <code>open</code>.</td>
+  </tr>
+  <tr>
+   <td><code>NotSupportedError</code></td>
+   <td>当前浏览器不支持你提交的 <code>mimeType</code> , 或者 it is not compatible with the <code>mimeType</code>s specified for the {{domxref("SourceBuffer")}} objects that already exist in {{domxref("MediaSource.sourceBuffers")}}.</td>
+  </tr>
+  <tr>
+   <td><code>QuotaExceededError</code></td>
+   <td>The user agent can't handle any more SourceBuffer objects, or creating a SourceBuffer based on this <code>mimeType</code> would result in an unsupported <a href="https://w3c.github.io/media-source/#sourcebuffer-configuration">SourceBuffer configuration.</a></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Example">Example</h2>
+
+<p>The following snippet is from a simple example written by Nick Desaulniers (<a href="http://nickdesaulniers.github.io/netfix/demo/bufferAll.html">view the full demo live</a>, or <a href="https://github.com/nickdesaulniers/netfix/blob/gh-pages/demo/bufferAll.html">download the source</a> for further investigation.)</p>
+
+<pre class="brush: js  language-js">var assetURL = 'frag_bunny.mp4';
+// Need to be specific for Blink regarding codecs
+// ./mp4info frag_bunny.mp4 | grep Codec
+var mimeCodec = 'video/mp4; codecs="avc1.42E01E, mp4a.40.2"';
+
+<code class="language-js"><span class="keyword token">if</span> <span class="punctuation token">(</span><span class="string token">'MediaSource'</span> <span class="keyword token">in</span> window <span class="operator token">&amp;&amp;</span> MediaSource<span class="punctuation token">.</span><span class="function token">isTypeSupported<span class="punctuation token">(</span></span>mimeCodec<span class="punctuation token">)</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
+  <span class="keyword token">var</span> mediaSource <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">MediaSource</span><span class="punctuation token">;</span>
+ <span class="comment token"> //console.log(mediaSource.readyState); // closed
+</span>  video<span class="punctuation token">.</span>src <span class="operator token">=</span> URL<span class="punctuation token">.</span><span class="function token">createObjectURL<span class="punctuation token">(</span></span>mediaSource<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  mediaSource<span class="punctuation token">.</span><span class="function token">addEventListener<span class="punctuation token">(</span></span><span class="string token">'sourceopen'</span><span class="punctuation token">,</span> sourceOpen<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span> <span class="keyword token">else</span> <span class="punctuation token">{</span>
+  console<span class="punctuation token">.</span><span class="function token">error<span class="punctuation token">(</span></span><span class="string token">'Unsupported MIME type or codec: '</span><span class="punctuation token">,</span> mimeCodec<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span>
+
+<span class="keyword token">function</span> sourceOpen <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+ <span class="comment token"> //console.log(this.readyState); // open
+</span>  <span class="keyword token">var</span> mediaSource <span class="operator token">=</span> <span class="keyword token">this</span><span class="punctuation token">;</span>
+  <span class="keyword token">var</span> sourceBuffer <span class="operator token">=</span> mediaSource<span class="punctuation token">.</span><span class="function token">addSourceBuffer<span class="punctuation token">(</span></span>mimeCodec<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="function token">fetchAB<span class="punctuation token">(</span></span>assetURL<span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>buf<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">addEventListener<span class="punctuation token">(</span></span><span class="string token">'updateend'</span><span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+      mediaSource<span class="punctuation token">.</span><span class="function token">endOfStream<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+      video<span class="punctuation token">.</span><span class="function token">play<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+     <span class="comment token"> //console.log(mediaSource.readyState); // ended
+</span>    <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">appendBuffer<span class="punctuation token">(</span></span>buf<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span><span class="punctuation token">;</span></code></pre>
+
+<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('Media Source Extensions', '#widl-MediaSource-addSourceBuffer-SourceBuffer-DOMString-type', 'addSourceBuffer()')}}</td>
+   <td>{{Spec2('Media Source Extensions')}}</td>
+   <td>Initial definition.</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>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>23</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("25.0")}}<sup>[1]</sup><br>
+    {{CompatGeckoDesktop("42.0")}}</td>
+   <td>11<sup>[2]</sup></td>
+   <td>15</td>
+   <td>8</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 (Gecko)</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>4.4.4</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>
+    <p>{{CompatNo}}</p>
+   </td>
+   <td>{{CompatNo}}</td>
+   <td>11</td>
+   <td>30</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Available after switching the <code>about:config</code> preference <code>media.mediasource.enabled</code> to <code>true</code>. In addition, support was limited to a whitelist of sites, for example YouTube, Netflix, and other popular streaming sites. The whitelist was removed and Media Source Extensions was enabled by default in 42+ for all sites.</p>
+
+<p>[2] Only works on Windows 8+.</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{domxref("SourceBuffer")}}</li>
+ <li>{{domxref("SourceBufferList")}}</li>
+</ul>