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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:07:59 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:07:59 +0100
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+---
+title: nsIDOMHTMLMediaElement
+slug: NsIDOMHTMLMediaElement
+---
+<p></p>
+
+<p><code>nsIDOMHTMLMediaElement</code> インターフェースは HTML 5 における <a class="internal" href="/Ja/HTML/Element/Audio" title="Ja/HTML/Element/Audio"><code>audio</code></a> および <a class="internal" href="/Ja/HTML/Element/Video" title="Ja/HTML/Element/Video"><code>video</code></a> 要素の実装に用いられています。</p>
+
+<div class="note"><strong>注意:</strong> <code> cue ranges</code> 機能の仕様は現在流動的な状況にあり、 HTML 5 標準においては大幅に改訂が加えられるか、置き換えられてしまう可能性があります。そのため、現時点では Firefox ではこの機能に対応していません。</div>
+
+<p></p><div style="border: solid #ddd 2px; margin-bottom: 12px;">
+<div style="background: #eee; padding: 2px;"><code><a href="https://dxr.mozilla.org/mozilla-central/source/dom/public/idl/html/nsIDOMHTMLMediaElement.idl" rel="custom">dom/public/idl/html/nsIDOMHTMLMediaElement.idl</a></code><span style="text-align: right; float: right;"><a href="/ja/docs/Interfaces/About_Scriptable_Interfaces" style="color: #00cc00; font-weight: 700;">Scriptable</a></span></div>
+<span style="padding: 4px 2px;">
+
+<i>Please add a summary to this article.</i>
+</span>
+
+<div style="background: #eee; padding: 2px;">
+<span> </span>
+<span style="text-align: right; float: right;">最終更新: Gecko 1.9.1 (Firefox 3.5 / Thunderbird 3.0 / SeaMonkey 2.0)</span></div>
+</div><p></p>
+
+<p>Inherits from: <code><a href="/ja/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDOMHTMLElement" title="">nsIDOMHTMLElement</a></code></p>
+
+<h2 id="Method_overview" name="Method_overview">メソッド概要 (Method Overview)</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <td><code>void <a class="internal" href="/Ja/NsIDOMHTMLMediaElement#addCueRange()" title="Ja/NsIDOMHTMLMediaElement#addCueRange()">addCueRange</a>(in DOMString className, in float start, in float end, in boolean pauseOnExit, in nsIDOMHTMLVoidCallback enterCallback, in nsIDOMHTMLVoidCallback exitCallback);</code></td>
+ </tr>
+ <tr>
+ <td><code>DOMString <a class="internal" href="/Ja/NsIDOMHTMLMediaElement#canPlayType()" title="Ja/NsIDOMHTMLMediaElement#canPlayType()">canPlayType</a>(in DOMString type);</code></td>
+ </tr>
+ <tr>
+ <td><code>void <a class="internal" href="/Ja/NsIDOMHTMLMediaElement#load()" title="Ja/NsIDOMHTMLMediaElement#load()">load</a>();</code></td>
+ </tr>
+ <tr>
+ <td><code>void <a class="internal" href="/Ja/NsIDOMHTMLMediaElement#pause()" title="Ja/NsIDOMHTMLMediaElement#pause()">pause</a>();</code></td>
+ </tr>
+ <tr>
+ <td><code>void <a class="internal" href="/Ja/NsIDOMHTMLMediaElement#play()" title="Ja/NsIDOMHTMLMediaElement#play()">play</a>();</code></td>
+ </tr>
+ <tr>
+ <td><code>void <a class="internal" href="/Ja/NsIDOMHTMLMediaElement#removeCueRanges()" title="Ja/NsIDOMHTMLMediaElement#removeCueRanges()">removeCueRanges</a>(in DOMString className);</code></td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Attributes" name="Attributes">属性 (Attributes)</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <td class="header" style="text-align: center;">属性</td>
+ <td class="header" style="text-align: center;">型</td>
+ <td class="header" style="text-align: center;">意味</td>
+ </tr>
+ <tr>
+ <td><code>autoplay</code></td>
+ <td><code>boolean</code></td>
+ <td><code>true</code> if playback should automatically begin as soon as enough media is available to do so without interruption.</td>
+ </tr>
+ <tr>
+ <td><code>buffered</code></td>
+ <td><code>TimeRanges</code></td>
+ <td>A static, normalized <code>TimeRanges</code> object describing the time ranges of the media that have been buffered.  <strong>Read only.</strong>  <span class="inlineIndicator unimplemented unimplementedInline">未実装</span></td>
+ </tr>
+ <tr>
+ <td><code>bufferedBytes</code></td>
+ <td><code>ByteRanges</code></td>
+ <td>A static, normalized <code>ByteRanges</code> object describing the byte ranges of the media that have been buffered.  <strong>Read only.</strong>  <span class="inlineIndicator unimplemented unimplementedInline">未実装</span></td>
+ </tr>
+ <tr>
+ <td><code>bufferingRate</code></td>
+ <td><code>float</code></td>
+ <td>The average number of bits per second for the current download over the past few seconds.  If there is no download in progress, this value is 0.0.  <strong>Read only.</strong>  <span class="inlineIndicator unimplemented unimplementedInline">未実装</span></td>
+ </tr>
+ <tr>
+ <td><code>bufferingThrottled</code></td>
+ <td><code>boolean</code></td>
+ <td><code>true</code> if Firefox is intentionally throttling the bandwidth used by the download (such as when the download is paused), otherwise <code>false</code>. <strong>Read only.</strong>  <span class="inlineIndicator unimplemented unimplementedInline">未実装</span></td>
+ </tr>
+ <tr>
+ <td><code>controls</code></td>
+ <td><code>boolean</code></td>
+ <td><code>true</code> if user interface for controlling the media should be presented.</td>
+ </tr>
+ <tr>
+ <td><code>currentSrc</code></td>
+ <td><code>DOMString</code></td>
+ <td>The absolute URL of the chosen media resource (if, for example, the server selects a media file based on the resolution of the user's display), or an empty string if the <code>networkState</code> is <code>EMPTY</code>. <strong>Read only.</strong></td>
+ </tr>
+ <tr>
+ <td><code>currentTime</code></td>
+ <td><code>float</code></td>
+ <td>The current playback time, in seconds.  Setting this value will seek the media to the new time.</td>
+ </tr>
+ <tr>
+ <td><code>defaultPlaybackRate</code></td>
+ <td><code>float</code></td>
+ <td>The default playback rate for the media.  The Ogg backend does not support this.  1.0 is "normal speed," values lower than 1.0 make the media play slower than normal, higher values make it play faster.  The value 0.0 is invalid and throws a <code>NOT_SUPPORTED_ERR</code> exception.</td>
+ </tr>
+ <tr>
+ <td><code>duration</code></td>
+ <td><code>float</code></td>
+ <td>The length of the media in seconds, or zero if no media data is available.  If the media data is available but the length is unknown, this value is <code>NaN</code>.  If the media is streamed and has no predefined length, the value is <code>Inf</code>.  <strong>Read only.</strong></td>
+ </tr>
+ <tr>
+ <td><code>ended</code></td>
+ <td><code>boolean</code></td>
+ <td><code>true</code> if playback has finished.  <strong>Read only.</strong></td>
+ </tr>
+ <tr>
+ <td><code>error</code></td>
+ <td><code><code><a href="/ja/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDOMHTMLMediaError" title="">nsIDOMHTMLMediaError</a></code></code></td>
+ <td>The media's error status.  <strong>Read only.</strong></td>
+ </tr>
+ <tr>
+ <td><code>muted</code></td>
+ <td><code>boolean</code></td>
+ <td><code>true</code> if the audio is muted, otherwise <code>false</code>.</td>
+ </tr>
+ <tr>
+ <td><code>networkState</code></td>
+ <td><code>unsigned short</code></td>
+ <td>
+ <p>The current state of the fetch of the media. <strong>Read only.</strong></p>
+
+ <table class="standard-table">
+ <tbody>
+ <tr>
+ <td class="header" style="text-align: center;">定数</td>
+ <td class="header" style="text-align: center;">値</td>
+ <td class="header" style="text-align: center;">意味</td>
+ </tr>
+ <tr>
+ <td><code>EMPTY</code></td>
+ <td>0</td>
+ <td>There is no data yet.  The <code>readyState</code> will also be <code>HAVE_NOTHING</code>.</td>
+ </tr>
+ <tr>
+ <td><code>LOADING</code></td>
+ <td>1</td>
+ <td>The media is loading.</td>
+ </tr>
+ <tr>
+ <td><code>LOADED_METADATA</code></td>
+ <td>2</td>
+ <td>The media's metadata has been loaded.</td>
+ </tr>
+ <tr>
+ <td><code>LOADED_FIRST_FRAME</code></td>
+ <td>3</td>
+ <td>The media's first frame has been loaded.</td>
+ </tr>
+ <tr>
+ <td><code>LOADED</code></td>
+ <td>4</td>
+ <td>The media has been fully loaded.</td>
+ </tr>
+ </tbody>
+ </table>
+ </td>
+ </tr>
+ <tr>
+ <td><code>paused</code></td>
+ <td><code>boolean</code></td>
+ <td><code>true</code> if the media playback is currently paused.  <strong>Read only.</strong></td>
+ </tr>
+ <tr>
+ <td><code>playbackRate</code></td>
+ <td><code>float</code></td>
+ <td>The current rate at which the media is being played back.  This is used to implement user controls for fast forward, slow motion, and so forth.  The normal playback rate is multiplied by this value to obtain the current rate, so a value of 1.0 indicates normal speed.  Not supported by the Ogg backend.</td>
+ </tr>
+ <tr>
+ <td><code>readyState</code></td>
+ <td><code>unsigned short</code></td>
+ <td>
+ <p>The media's current readiness state.  <strong>Read only.</strong></p>
+
+ <table class="standard-table">
+ <tbody>
+ <tr>
+ <td class="header" style="text-align: center;">定数</td>
+ <td class="header" style="text-align: center;">値</td>
+ <td class="header" style="text-align: center;">意味</td>
+ </tr>
+ <tr>
+ <td><code>HAVE_NOTHING</code></td>
+ <td>0</td>
+ <td>No information is available about the media resource.</td>
+ </tr>
+ <tr>
+ <td><code>HAVE_METADATA</code></td>
+ <td>1</td>
+ <td>Enough of the media resource has been retrieved that the metadata attributes are initialized.  Seeking will no longer raise an exception.</td>
+ </tr>
+ <tr>
+ <td><code>HAVE_SOME_DATA</code></td>
+ <td>2</td>
+ <td>Data for the current playback position is not available, but there is at least one playback position for which data is available.</td>
+ </tr>
+ <tr>
+ <td><code>HAVE_CURRENT_DATA</code></td>
+ <td>3</td>
+ <td>Data is available for the current playback position, but not enough to actually play more than one frame.</td>
+ </tr>
+ <tr>
+ <td><code>HAVE_FUTURE_DATA</code></td>
+ <td>4</td>
+ <td>Data for the current playback position as well as for at least a little bit of time into the future is available (in other words, at least two frames of video, for example).</td>
+ </tr>
+ <tr>
+ <td><code>HAVE_ENOUGH_DATA</code></td>
+ <td>5</td>
+ <td>Enough data is available—and the download rate is high enough—that the media can be played through to the end without interruption.</td>
+ </tr>
+ </tbody>
+ </table>
+ </td>
+ </tr>
+ <tr>
+ <td><code>seeking</code></td>
+ <td><code>boolean</code></td>
+ <td><code>true</code> if the media is in the process of seeking to a new position, otherwise <code>false</code>.<strong> Read only.</strong></td>
+ </tr>
+ <tr>
+ <td><code>src</code></td>
+ <td><code>DOMString</code></td>
+ <td>The URL of the media to present.</td>
+ </tr>
+ <tr>
+ <td><code>totalBytes</code></td>
+ <td><code>unsigned long</code></td>
+ <td>The length, in bytes, of the media resource.  If the length is unknown, or the content is streamed and therefore has no specified length, this value is 0.  <strong>Read only.</strong></td>
+ </tr>
+ <tr>
+ <td><code>volume</code></td>
+ <td><code>float</code></td>
+ <td>The current audio volume, from 0.0 (silent) to 1.0 (maximum).</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="メソッド_(Methods)">メソッド (Methods)</h2>
+
+<h3 id="addCueRange()">addCueRange()</h3>
+
+<div class="note"><strong>Note:</strong> This method is not yet implemented, as its definition is in flux in the HTML 5 standard.</div>
+
+<p>Adds a cue range to the media element.</p>
+
+<pre>void addCueRange(
+  in DOMString className,
+  in float start,
+  in float end,
+  in boolean pauseOnExit,
+  in nsIDOMHTMLVoidCallback enterCallback,
+  in nsIDOMHTMLVoidCallback exitCallback
+);
+</pre>
+
+<h6 id="Parameters">Parameters</h6>
+
+<p>xxx</p>
+
+<h3 id="eatCookie.28.29" name="eatCookie.28.29">canPlayType()</h3>
+
+<p>Determines whether or not the specified media type can be played back.</p>
+
+<pre class="eval">DOMString canPlayType(
+  in DOMString type
+);</pre>
+
+<h6 id="Parameters_4">Parameters</h6>
+
+<dl>
+ <dt>type</dt>
+ <dd>The media type to test for, such as "video/ogg".</dd>
+</dl>
+
+<h6 id="Return_value">Return value</h6>
+
+<ul>
+ <li>"" if the specified type definitely cannot be played. (was "no" until Gecko 1.9.1.1/ Firefox 3.5.1)</li>
+ <li>"probably" if the specified type appears to be playable.</li>
+ <li>"maybe" if it's impossible to be sure if the type can be played without actually attempting to do so.</li>
+</ul>
+
+<p>Because media formats are complicated, and it's impossible to judge every possible detail from the type string, there is no such thing as 100% certain that the specified type can be played; the best you can do is "probably".</p>
+
+<h3 id="eatCookie.28.29" name="eatCookie.28.29">load()</h3>
+
+<p>Begins loading the media content from the server.</p>
+
+<pre class="eval"> void load();</pre>
+
+<h6 id="Parameters_5">Parameters</h6>
+
+<p>None.</p>
+
+<h3 id="getFunnySaying.28.29" name="getFunnySaying.28.29">pause()</h3>
+
+<p>Pauses the media playback.</p>
+
+<pre class="eval"> void pause();
+</pre>
+
+<h6 id="Parameters_2" name="Parameters_2">Parameters</h6>
+
+<p>None.</p>
+
+<h3 id="sayYummy.28.29" name="sayYummy.28.29">play()</h3>
+
+<p>Begins playback of the media.</p>
+
+<pre class="eval"> void play();
+</pre>
+
+<h6 id="Parameters_3" name="Parameters_3">Parameters</h6>
+
+<p>None.</p>
+
+<h3 id="removeCueRanges()">removeCueRanges()</h3>
+
+<div class="note"><strong>Note:</strong> This function is not yet implemented, as its definition in the HTML 5 standard is in flux.</div>
+
+<pre>void removeCueRanges(
+  in DOMString className
+);
+</pre>
+
+<h6 id="Parameters_6">Parameters</h6>
+
+<p>xxx</p>
+
+<h2 id="See_also" name="See_also">参考資料</h2>
+
+<ul>
+ <li><code><a class="internal" href="/Ja/HTML/Element/Video" title="Ja/HTML/Element/Video">video</a></code></li>
+ <li><a class="internal" href="/Ja/HTML/Element/Audio" title="Ja/HTML/Element/Audio"><code>audio</code></a></li>
+ <li><a class="internal" href="/Ja/HTML/Element/Source" title="Ja/HTML/Element/Source"><code>source</code></a></li>
+ <li><a class="internal" href="/Ja/Using_audio_and_video_in_Firefox" title="Ja/Using audio and video in Firefox">Using audio and video in Firefox</a></li>
+</ul>