blob: 272b7ff595cbc0c727d144b2fbcc064271ab62f8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
---
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>
|
