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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">&&</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>
{{Compat("api.MediaSource.addSourceBuffer")}}
<h2 id="See_also">See also</h2>
<ul>
<li>{{domxref("SourceBuffer")}}</li>
<li>{{domxref("SourceBufferList")}}</li>
</ul>
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