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<h1 class="title">QAudioDeviceInfo Class Reference</h1>
<!-- $$$QAudioDeviceInfo-brief -->
<p>The QAudioDeviceInfo class provides an interface to query audio devices and their functionality. <a href="#details">More...</a></p>
<!-- @@@QAudioDeviceInfo -->
<pre class="cpp"> <span class="preprocessor">#include <QAudioDeviceInfo></span></pre><p>This class was introduced in Qt 4.6.</p>
<ul>
<li><a href="qaudiodeviceinfo-members.html">List of all members, including inherited members</a></li>
<li><a href="qaudiodeviceinfo-obsolete.html">Obsolete members</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#QAudioDeviceInfo">QAudioDeviceInfo</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#QAudioDeviceInfo-2">QAudioDeviceInfo</a></b> ( const QAudioDeviceInfo & <i>other</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#dtor.QAudioDeviceInfo">~QAudioDeviceInfo</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#deviceName">deviceName</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#isFormatSupported">isFormatSupported</a></b> ( const QAudioFormat & <i>settings</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#isNull">isNull</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAudioFormat </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#nearestFormat">nearestFormat</a></b> ( const QAudioFormat & <i>settings</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAudioFormat </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#preferredFormat">preferredFormat</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QList<QAudioFormat::Endian> </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#supportedByteOrders">supportedByteOrders</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QList<int> </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#supportedChannelCounts">supportedChannelCounts</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QStringList </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#supportedCodecs">supportedCodecs</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QList<int> </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#supportedSampleRates">supportedSampleRates</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QList<int> </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#supportedSampleSizes">supportedSampleSizes</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QList<QAudioFormat::SampleType> </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#supportedSampleTypes">supportedSampleTypes</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAudioDeviceInfo & </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#operator-eq">operator=</a></b> ( const QAudioDeviceInfo & <i>other</i> )</td></tr>
</table>
<a name="static-public-members"></a>
<h2>Static Public Members</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> QList<QAudioDeviceInfo> </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#availableDevices">availableDevices</a></b> ( QAudio::Mode <i>mode</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAudioDeviceInfo </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#defaultInputDevice">defaultInputDevice</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAudioDeviceInfo </td><td class="memItemRight bottomAlign"><b><a href="qaudiodeviceinfo.html#defaultOutputDevice">defaultOutputDevice</a></b> ()</td></tr>
</table>
<a name="details"></a>
<!-- $$$QAudioDeviceInfo-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QAudioDeviceInfo class provides an interface to query audio devices and their functionality.</p>
<p>QAudioDeviceInfo lets you query for audio devices--such as sound cards and USB headsets--that are currently available on the system. The audio devices available are dependent on the platform or audio plugins installed.</p>
<p>You can also query each device for the formats it supports. A format in this context is a set consisting of a specific byte order, channel, codec, frequency, sample rate, and sample type. A format is represented by the <a href="qaudioformat.html">QAudioFormat</a> class.</p>
<p>The values supported by the the device for each of these parameters can be fetched with <a href="qaudiodeviceinfo.html#supportedByteOrders">supportedByteOrders</a>(), <a href="qaudiodeviceinfo.html#supportedChannelCounts">supportedChannelCounts</a>(), <a href="qaudiodeviceinfo.html#supportedCodecs">supportedCodecs</a>(), <a href="qaudiodeviceinfo.html#supportedSampleRates">supportedSampleRates</a>(), <a href="qaudiodeviceinfo.html#supportedSampleSizes">supportedSampleSizes</a>(), and <a href="qaudiodeviceinfo.html#supportedSampleTypes">supportedSampleTypes</a>(). The combinations supported are dependent on the platform, audio plugins installed and the audio device capabilities. If you need a specific format, you can check if the device supports it with <a href="qaudiodeviceinfo.html#isFormatSupported">isFormatSupported</a>(), or fetch a supported format that is as close as possible to the format with <a href="qaudiodeviceinfo.html#nearestFormat">nearestFormat</a>(). For instance:</p>
<pre class="cpp"> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> format;
format<span class="operator">.</span>setFrequency(<span class="number">44100</span>);
...
format<span class="operator">.</span>setSampleType(<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>SignedInt);
<span class="type">QAudioDeviceInfo</span> info(<span class="type">QAudioDeviceInfo</span><span class="operator">::</span>defaultOutputDevice());
<span class="keyword">if</span> (<span class="operator">!</span>info<span class="operator">.</span>isFormatSupported(format))
format <span class="operator">=</span> info<span class="operator">.</span>nearestFormat(format);</pre>
<p>A QAudioDeviceInfo is used by Qt to construct classes that communicate with the device--such as <a href="qaudioinput.html">QAudioInput</a>, and <a href="qaudiooutput.html">QAudioOutput</a>. The static functions <a href="qaudiodeviceinfo.html#defaultInputDevice">defaultInputDevice</a>(), <a href="qaudiodeviceinfo.html#defaultOutputDevice">defaultOutputDevice</a>(), and <a href="qaudiodeviceinfo.html#availableDevices">availableDevices</a>() let you get a list of all available devices. Devices are fetch according to the value of mode this is specified by the <a href="qaudio.html#Mode-enum">QAudio::Mode</a> enum. The QAudioDeviceInfo returned are only valid for the <a href="qaudio.html#Mode-enum">QAudio::Mode</a>.</p>
<p>For instance:</p>
<pre class="cpp"> <a href="qtglobal.html#foreach">foreach</a>(<span class="keyword">const</span> <span class="type">QAudioDeviceInfo</span> <span class="operator">&</span>deviceInfo<span class="operator">,</span> <span class="type">QAudioDeviceInfo</span><span class="operator">::</span>availableDevices(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>AudioOutput))
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Device name: "</span> <span class="operator"><</span><span class="operator"><</span> deviceInfo<span class="operator">.</span><a href="qaudiodeviceinfo.html#deviceName">deviceName</a>();</pre>
<p>In this code sample, we loop through all devices that are able to output sound, i.e., play an audio stream in a supported format. For each device we find, we simply print the <a href="qaudiodeviceinfo.html#deviceName">deviceName</a>().</p>
</div>
<p><b>See also </b><a href="qaudiooutput.html">QAudioOutput</a> and <a href="qaudioinput.html">QAudioInput</a>.</p>
<!-- @@@QAudioDeviceInfo -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QAudioDeviceInfo[overload1]$$$QAudioDeviceInfo -->
<h3 class="fn"><a name="QAudioDeviceInfo"></a>QAudioDeviceInfo::<span class="name">QAudioDeviceInfo</span> ()</h3>
<p>Constructs an empty <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a> object.</p>
<!-- @@@QAudioDeviceInfo -->
<!-- $$$QAudioDeviceInfo$$$QAudioDeviceInfoconstQAudioDeviceInfo& -->
<h3 class="fn"><a name="QAudioDeviceInfo-2"></a>QAudioDeviceInfo::<span class="name">QAudioDeviceInfo</span> ( const <span class="type">QAudioDeviceInfo</span> & <i>other</i> )</h3>
<p>Constructs a copy of <i>other</i>.</p>
<!-- @@@QAudioDeviceInfo -->
<!-- $$$~QAudioDeviceInfo[overload1]$$$~QAudioDeviceInfo -->
<h3 class="fn"><a name="dtor.QAudioDeviceInfo"></a>QAudioDeviceInfo::<span class="name">~QAudioDeviceInfo</span> ()</h3>
<p>Destroy this audio device info.</p>
<!-- @@@~QAudioDeviceInfo -->
<!-- $$$availableDevices[overload1]$$$availableDevicesQAudio::Mode -->
<h3 class="fn"><a name="availableDevices"></a><span class="type"><a href="qlist.html">QList</a></span><<span class="type">QAudioDeviceInfo</span>> QAudioDeviceInfo::<span class="name">availableDevices</span> ( <span class="type"><a href="qaudio.html#Mode-enum">QAudio::Mode</a></span> <i>mode</i> )<tt> [static]</tt></h3>
<p>Returns a list of audio devices that support <i>mode</i>.</p>
<!-- @@@availableDevices -->
<!-- $$$defaultInputDevice[overload1]$$$defaultInputDevice -->
<h3 class="fn"><a name="defaultInputDevice"></a><span class="type">QAudioDeviceInfo</span> QAudioDeviceInfo::<span class="name">defaultInputDevice</span> ()<tt> [static]</tt></h3>
<p>Returns the name of the default input audio device. All platform and audio plugin implementations provide a default audio device to use.</p>
<!-- @@@defaultInputDevice -->
<!-- $$$defaultOutputDevice[overload1]$$$defaultOutputDevice -->
<h3 class="fn"><a name="defaultOutputDevice"></a><span class="type">QAudioDeviceInfo</span> QAudioDeviceInfo::<span class="name">defaultOutputDevice</span> ()<tt> [static]</tt></h3>
<p>Returns the name of the default output audio device. All platform and audio plugin implementations provide a default audio device to use.</p>
<!-- @@@defaultOutputDevice -->
<!-- $$$deviceName[overload1]$$$deviceName -->
<h3 class="fn"><a name="deviceName"></a><span class="type"><a href="qstring.html">QString</a></span> QAudioDeviceInfo::<span class="name">deviceName</span> () const</h3>
<p>Returns human readable name of audio device.</p>
<p>Device names vary depending on platform/audio plugin being used.</p>
<p>They are a unique string identifiers for the audio device.</p>
<p>eg. default, Intel, U0x46d0x9a4</p>
<!-- @@@deviceName -->
<!-- $$$isFormatSupported[overload1]$$$isFormatSupportedconstQAudioFormat& -->
<h3 class="fn"><a name="isFormatSupported"></a><span class="type">bool</span> QAudioDeviceInfo::<span class="name">isFormatSupported</span> ( const <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> & <i>settings</i> ) const</h3>
<p>Returns true if <i>settings</i> are supported by the audio device of this <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a>.</p>
<!-- @@@isFormatSupported -->
<!-- $$$isNull[overload1]$$$isNull -->
<h3 class="fn"><a name="isNull"></a><span class="type">bool</span> QAudioDeviceInfo::<span class="name">isNull</span> () const</h3>
<p>Returns whether this <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a> object holds a device definition.</p>
<!-- @@@isNull -->
<!-- $$$nearestFormat[overload1]$$$nearestFormatconstQAudioFormat& -->
<h3 class="fn"><a name="nearestFormat"></a><span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> QAudioDeviceInfo::<span class="name">nearestFormat</span> ( const <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> & <i>settings</i> ) const</h3>
<p>Returns closest <a href="qaudioformat.html">QAudioFormat</a> to <i>settings</i> that system audio supports.</p>
<p>These settings are provided by the platform/audio plugin being used.</p>
<p>They also are dependent on the <a href="qaudio.html#Mode-enum">QAudio::Mode</a> being used.</p>
<!-- @@@nearestFormat -->
<!-- $$$preferredFormat[overload1]$$$preferredFormat -->
<h3 class="fn"><a name="preferredFormat"></a><span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> QAudioDeviceInfo::<span class="name">preferredFormat</span> () const</h3>
<p>Returns <a href="qaudioformat.html">QAudioFormat</a> of default settings.</p>
<p>These settings are provided by the platform/audio plugin being used.</p>
<p>They also are dependent on the <a href="qaudio.html#Mode-enum">QAudio::Mode</a> being used.</p>
<p>A typical audio system would provide something like:</p>
<ul>
<li>Input settings: 8000Hz mono 8 bit.</li>
<li>Output settings: 44100Hz stereo 16 bit little endian.</li>
</ul>
<!-- @@@preferredFormat -->
<!-- $$$supportedByteOrders[overload1]$$$supportedByteOrders -->
<h3 class="fn"><a name="supportedByteOrders"></a><span class="type"><a href="qlist.html">QList</a></span><<span class="type"><a href="qaudioformat.html#Endian-enum">QAudioFormat::Endian</a></span>> QAudioDeviceInfo::<span class="name">supportedByteOrders</span> () const</h3>
<p>Returns a list of supported byte orders.</p>
<!-- @@@supportedByteOrders -->
<!-- $$$supportedChannelCounts[overload1]$$$supportedChannelCounts -->
<h3 class="fn"><a name="supportedChannelCounts"></a><span class="type"><a href="qlist.html">QList</a></span><<span class="type">int</span>> QAudioDeviceInfo::<span class="name">supportedChannelCounts</span> () const</h3>
<p>Returns a list of supported channel counts.</p>
<p>This function was introduced in Qt 4.7.</p>
<!-- @@@supportedChannelCounts -->
<!-- $$$supportedCodecs[overload1]$$$supportedCodecs -->
<h3 class="fn"><a name="supportedCodecs"></a><span class="type"><a href="qstringlist.html">QStringList</a></span> QAudioDeviceInfo::<span class="name">supportedCodecs</span> () const</h3>
<p>Returns a list of supported codecs.</p>
<p>All platform and plugin implementations should provide support for:</p>
<p>"audio/pcm" - Linear PCM</p>
<p>For writing plugins to support additional codecs refer to:</p>
<p>http://www.iana.org/assignments/media-types/audio/</p>
<!-- @@@supportedCodecs -->
<!-- $$$supportedSampleRates[overload1]$$$supportedSampleRates -->
<h3 class="fn"><a name="supportedSampleRates"></a><span class="type"><a href="qlist.html">QList</a></span><<span class="type">int</span>> QAudioDeviceInfo::<span class="name">supportedSampleRates</span> () const</h3>
<p>Returns a list of supported sample rates.</p>
<p>This function was introduced in Qt 4.7.</p>
<!-- @@@supportedSampleRates -->
<!-- $$$supportedSampleSizes[overload1]$$$supportedSampleSizes -->
<h3 class="fn"><a name="supportedSampleSizes"></a><span class="type"><a href="qlist.html">QList</a></span><<span class="type">int</span>> QAudioDeviceInfo::<span class="name">supportedSampleSizes</span> () const</h3>
<p>Returns a list of supported sample sizes.</p>
<!-- @@@supportedSampleSizes -->
<!-- $$$supportedSampleTypes[overload1]$$$supportedSampleTypes -->
<h3 class="fn"><a name="supportedSampleTypes"></a><span class="type"><a href="qlist.html">QList</a></span><<span class="type"><a href="qaudioformat.html#SampleType-enum">QAudioFormat::SampleType</a></span>> QAudioDeviceInfo::<span class="name">supportedSampleTypes</span> () const</h3>
<p>Returns a list of supported sample types.</p>
<!-- @@@supportedSampleTypes -->
<!-- $$$operator=[overload1]$$$operator=constQAudioDeviceInfo& -->
<h3 class="fn"><a name="operator-eq"></a><span class="type">QAudioDeviceInfo</span> & QAudioDeviceInfo::<span class="name">operator=</span> ( const <span class="type">QAudioDeviceInfo</span> & <i>other</i> )</h3>
<p>Sets the <a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a> object to be equal to <i>other</i>.</p>
<!-- @@@operator= -->
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