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<td >Qt 5.9</td><td ><a href="qtmultimedia-index.html">Qt Multimedia</a></td><td ><a href="qtmultimedia-modules.html">C++ Classes</a></td><td >QMediaService</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#protected-functions">Protected Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QMediaService Class</h1>
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<p>The <a href="qmediaservice.html">QMediaService</a> class provides a common base class for media service implementations. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QMediaService></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += multimedia</td></tr></table></div><ul>
<li><a href="qmediaservice-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmediaservice.html#dtor.QMediaService">~QMediaService</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qmediaservice.html#releaseControl">releaseControl</a></b>(QMediaControl *<i>control</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QMediaControl *</td><td class="memItemRight bottomAlign"><b><a href="qmediaservice.html#requestControl">requestControl</a></b>(const char *<i>interface</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> T </td><td class="memItemRight bottomAlign"><b><a href="qmediaservice.html#requestControl-1">requestControl</a></b>()</td></tr>
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<h2 id="protected-functions">Protected Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmediaservice.html#QMediaService">QMediaService</a></b>(QObject *<i>parent</i>)</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qmediaservice.html">QMediaService</a> class provides a common base class for media service implementations.</p>
<p>Media services provide implementations of the functionality promised by media objects, and allow multiple providers to implement a <a href="qmediaobject.html">QMediaObject</a>.</p>
<p>To provide the functionality of a <a href="qmediaobject.html">QMediaObject</a> media services implement <a href="qmediacontrol.html">QMediaControl</a> interfaces. Services typically implement one core media control which provides the core feature of a media object, and some number of additional controls which provide either optional features of the media object, or features of a secondary media object or peripheral object.</p>
<p>A pointer to media service's <a href="qmediacontrol.html">QMediaControl</a> implementation can be obtained by passing the control's interface name to the <a href="qmediaservice.html#requestControl-1">requestControl</a>() function.</p>
<pre class="cpp">
<span class="type"><a href="qmediaplayercontrol.html">QMediaPlayerControl</a></span> <span class="operator">*</span>control <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qmediaplayercontrol.html">QMediaPlayerControl</a></span> <span class="operator">*</span><span class="operator">></span>(
mediaService<span class="operator">-</span><span class="operator">></span>requestControl(<span class="string">"org.qt-project.qt.mediaplayercontrol/5.0"</span>));
</pre>
<p>Media objects can use services loaded dynamically from plug-ins or implemented statically within an applications. Plug-in based services should also implement the <a href="qmediaserviceproviderplugin.html">QMediaServiceProviderPlugin</a> interface. Static services should implement the QMediaServiceProvider interface. In general, implementing a <a href="qmediaservice.html">QMediaService</a> is outside of the scope of this documentation and support on the relevant mailing lists or IRC channels should be sought.</p>
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<p><b>See also </b><a href="qmediaobject.html">QMediaObject</a> and <a href="qmediacontrol.html">QMediaControl</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QMediaService"><a name="QMediaService"></a><code>[protected] </code>QMediaService::<span class="name">QMediaService</span>(<span class="type">QObject</span> *<i>parent</i>)</h3>
<p>Construct a media service with the given <i>parent</i>. This class is meant as a base class for Multimedia services so this constructor is protected.</p>
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<h3 class="fn" id="dtor.QMediaService"><a name="dtor.QMediaService"></a>QMediaService::<span class="name">~QMediaService</span>()</h3>
<p>Destroys a media service.</p>
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<h3 class="fn" id="releaseControl"><a name="releaseControl"></a><code>[pure virtual] </code><span class="type">void</span> QMediaService::<span class="name">releaseControl</span>(<span class="type"><a href="qmediacontrol.html">QMediaControl</a></span> *<i>control</i>)</h3>
<p>Releases a <i>control</i> back to the service.</p>
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<h3 class="fn" id="requestControl"><a name="requestControl"></a><code>[pure virtual] </code><span class="type"><a href="qmediacontrol.html">QMediaControl</a></span> *QMediaService::<span class="name">requestControl</span>(const <span class="type">char</span> *<i>interface</i>)</h3>
<p>Returns a pointer to the media control implementing <i>interface</i>.</p>
<p>If the service does not implement the control, or if it is unavailable a null pointer is returned instead.</p>
<p>Controls must be returned to the service when no longer needed using the <a href="qmediaservice.html#releaseControl">releaseControl</a>() function.</p>
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<h3 class="fn" id="requestControl-1"><a name="requestControl-1"></a><span class="type">T</span> QMediaService::<span class="name">requestControl</span>()</h3>
<p>Returns a pointer to the media control of type T implemented by a media service.</p>
<p>If the service does not implement the control, or if it is unavailable a null pointer is returned instead.</p>
<p>Controls must be returned to the service when no longer needed using the <a href="qmediaservice.html#releaseControl">releaseControl</a>() function.</p>
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