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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
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  <title>Qt 4.8: BackendCapabilities Namespace</title>
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    <a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#classes">Classes</a></li>
<li class="level1"><a href="#functions">Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">BackendCapabilities Namespace</h1>
<span class="small-subtitle">(Phonon::BackendCapabilities)<br/></span>
<!-- $$$BackendCapabilities-brief -->
<p>The BackendCapabilities namespace contains functions to describe the capabilities of the multimedia backend. <a href="#details">More...</a></p>
<!-- @@@BackendCapabilities -->
<pre class="cpp"> <span class="preprocessor">#include &lt;<a href="phonon.html">Phonon</a>&gt;</span></pre><p>This namespace was introduced in Qt 4.4.</p>
<ul>
</ul>
<a name="classes"></a>
<h2>Classes</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> class </td><td class="memItemRight bottomAlign"><b><a href="phonon-backendcapabilities-notifier.html">Notifier</a></b></td></tr>
</table>
<a name="functions"></a>
<h2>Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> QList&lt;EffectDescription&gt; </td><td class="memItemRight bottomAlign"><b><a href="phonon-backendcapabilities.html#availableAudioEffects">availableAudioEffects</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QList&lt;AudioOutputDevice&gt; </td><td class="memItemRight bottomAlign"><b><a href="phonon-backendcapabilities.html#availableAudioOutputDevices">availableAudioOutputDevices</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QStringList </td><td class="memItemRight bottomAlign"><b><a href="phonon-backendcapabilities.html#availableMimeTypes">availableMimeTypes</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="phonon-backendcapabilities.html#isMimeTypeAvailable">isMimeTypeAvailable</a></b> ( const QString &amp; <i>mimeType</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Notifier * </td><td class="memItemRight bottomAlign"><b><a href="phonon-backendcapabilities.html#notifier">notifier</a></b> ()</td></tr>
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<a name="details"></a>
<!-- $$$BackendCapabilities-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The BackendCapabilities namespace contains functions to describe the capabilities of the multimedia backend.</p>
</div>
<!-- @@@BackendCapabilities -->
<div class="classes">
<h2>Classes</h2>
<h3> class <a href="phonon-backendcapabilities-notifier.html">Notifier</a></h3></div>
<div class="func">
<h2>Function Documentation</h2>
<!-- $$$availableAudioEffects[overload1]$$$availableAudioEffects -->
<h3 class="fn"><a name="availableAudioEffects"></a><span class="type"><a href="qlist.html">QList</a></span>&lt;<span class="type"><a href="phonon-objectdescription.html#EffectDescription-typedef">EffectDescription</a></span>&gt; BackendCapabilities::<span class="name">availableAudioEffects</span> ()</h3>
<p>Returns descriptions for the audio effects the backend supports.</p>
<p>Returns A list of AudioEffectDescription objects that give a name and description for every supported audio effect.</p>
<!-- @@@availableAudioEffects -->
<!-- $$$availableAudioOutputDevices[overload1]$$$availableAudioOutputDevices -->
<h3 class="fn"><a name="availableAudioOutputDevices"></a><span class="type"><a href="qlist.html">QList</a></span>&lt;<span class="type"><a href="phonon-objectdescription.html#AudioOutputDevice-typedef">AudioOutputDevice</a></span>&gt; BackendCapabilities::<span class="name">availableAudioOutputDevices</span> ()</h3>
<p>Returns the audio output devices the backend supports.</p>
<p>Returns A list of <a href="phonon-objectdescription.html#AudioOutputDevice-typedef">AudioOutputDevice</a> objects that give a name and description for every supported audio output device.</p>
<!-- @@@availableAudioOutputDevices -->
<!-- $$$availableMimeTypes[overload1]$$$availableMimeTypes -->
<h3 class="fn"><a name="availableMimeTypes"></a><span class="type"><a href="qstringlist.html">QStringList</a></span> BackendCapabilities::<span class="name">availableMimeTypes</span> ()</h3>
<p>Returns a list of mime types that the Backend can decode.</p>
<p><b>See also </b><a href="phonon-backendcapabilities.html#isMimeTypeAvailable">isMimeTypeAvailable</a>().</p>
<!-- @@@availableMimeTypes -->
<!-- $$$isMimeTypeAvailable[overload1]$$$isMimeTypeAvailableconstQString& -->
<h3 class="fn"><a name="isMimeTypeAvailable"></a><span class="type">bool</span> BackendCapabilities::<span class="name">isMimeTypeAvailable</span> ( const <span class="type"><a href="qstring.html">QString</a></span> &amp; <i>mimeType</i> )</h3>
<p>Often all you want to know is whether one given MIME type can be decoded by the backend. Use this method in favor of <a href="phonon-backendcapabilities.html#availableMimeTypes">availableMimeTypes</a>() as it can give you a negative answer without having a backend loaded.</p>
<p>Returns true if the given <i>mimeType</i> is supported by the backend; otherwise, returns false.</p>
<p><b>See also </b><a href="phonon-backendcapabilities.html#availableMimeTypes">availableMimeTypes</a>().</p>
<!-- @@@isMimeTypeAvailable -->
<!-- $$$notifier[overload1]$$$notifier -->
<h3 class="fn"><a name="notifier"></a><span class="type"><a href="phonon-backendcapabilities-notifier.html">Notifier</a></span> * BackendCapabilities::<span class="name">notifier</span> ()</h3>
<p>Use this function to get a <a href="qobject.html">QObject</a> pointer to connect to the capabilitiesChanged signal.</p>
<p>Returns a pointer to a <a href="qobject.html">QObject</a>.</p>
<p>The capabilitiesChanged signal is emitted if the capabilities have changed. This can happen if the user has requested a backend change.</p>
<p>To connect to this signal do the following:</p>
<pre class="cpp"> <span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(BackendCapabilities<span class="operator">::</span>notifier()<span class="operator">,</span> SIGNAL(capabilitiesChanged())<span class="operator">,</span> <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span></pre>
<p><b>See also </b><a href="phonon-backendcapabilities-notifier.html#capabilitiesChanged">Notifier::capabilitiesChanged</a>().</p>
<!-- @@@notifier -->
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