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+---
+title: MediaSource.activeSourceBuffers
+slug: Web/API/MediaSource/activeSourceBuffers
+tags:
+  - API
+  - Audio
+  - Experimental
+  - MSE
+  - Media Source Extensions
+  - MediaSource
+  - Property
+  - Reference
+  - Video
+  - activeSourceBuffers
+translation_of: Web/API/MediaSource/activeSourceBuffers
+---
+<div>{{APIRef("Media Source Extensions")}}</div>
+
+<p><span class="seoSummary">{{domxref("MediaSource")}} インターフェイスの <strong><code>activeSourceBuffers</code></strong> 読み取り専用プロパティは、{{domxref("MediaSource.sourceBuffers", "sourceBuffers")}} に含まれる {{domxref("SourceBuffer")}} オブジェクトのサブセットを含む {{domxref("SourceBufferList")}} オブジェクトを返します。 これは、選択した動画トラック、有効な音声トラック、および表示/非表示のテキストトラックを提供するオブジェクトのリストです。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox">var <em>myActiveSourceBuffers</em> = <em>mediaSource</em>.activeSourceBuffers;</pre>
+
+<h3 id="Value" name="Value">値</h3>
+
+<p>アクティブな各トラックの {{domxref("SourceBuffer")}} オブジェクトを含む {{domxref("SourceBufferList")}}。</p>
+
+<h2 id="Example" name="Example">例</h2>
+
+<p>次のスニペットは、Nick Desaulniers によって書かれた簡単な例に基づいています（<a href="http://nickdesaulniers.github.io/netfix/demo/bufferAll.html">ライブで完全なデモを見る</a>か、<a href="https://github.com/nickdesaulniers/netfix/blob/gh-pages/demo/bufferAll.html">ソースをダウンロード</a>してさらに調査してください）。</p>
+
+<pre class="brush: js  language-js"><code class="language-js"><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">;
+      console.log(mediaSource.activeSourceBuffers);
+      // 動画プレーヤーでの再生用に選択されているため、
+      // 上記で追加されたソースバッファーが含まれます。</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" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+   <th scope="col">状態</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Media Source Extensions', '#idl-def-mediasource-activesourcebuffers', 'activeSourceBuffers')}}</td>
+   <td>{{Spec2('Media Source Extensions')}}</td>
+   <td>初期定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+<div>
+
+
+<p>{{Compat("api.MediaSource.activeSourceBuffers")}}</p>
+</div>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{domxref("SourceBuffer")}}</li>
+ <li>{{domxref("SourceBufferList")}}</li>
+</ul>