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<h1 class="title">ObjectDescription Class Reference</h1>
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<span class="small-subtitle">(Phonon::ObjectDescription)<br/></span>
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<!-- $$$ObjectDescription-brief -->
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<p>The ObjectDescription class provides information about Phonon objects. <a href="#details">More...</a></p>
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<!-- @@@ObjectDescription -->
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<pre class="cpp"> <span class="preprocessor">#include <Phonon/ObjectDescription></span></pre><p>This class was introduced in Qt 4.4.</p>
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<ul>
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<li><a href="phonon-objectdescription-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
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<h2>Public Functions</h2>
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<table class="alignedsummary">
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<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#description">description</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#index">index</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#isValid">isValid</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#name">name</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QVariant </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#property">property</a></b> ( const char * <i>name</i> ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QList<QByteArray> </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#propertyNames">propertyNames</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#operator-not-eq">operator!=</a></b> ( const ObjectDescription & <i>otherDescription</i> ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#operator-eq-eq">operator==</a></b> ( const ObjectDescription & <i>otherDescription</i> ) const</td></tr>
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</table>
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<a name="related-non-members"></a>
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<h2>Related Non-Members</h2>
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<table class="alignedsummary">
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<tr><td class="memItemLeft rightAlign topAlign"> typedef </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#AudioOutputDevice-typedef">AudioOutputDevice</a></b></td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> typedef </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#EffectDescription-typedef">EffectDescription</a></b></td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> enum </td><td class="memItemRight bottomAlign"><b><a href="phonon-objectdescription.html#ObjectDescriptionType-enum">ObjectDescriptionType</a></b> { AudioOutputDeviceType, EffectType }</td></tr>
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</table>
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<a name="details"></a>
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<!-- $$$ObjectDescription-description -->
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<div class="descr">
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<h2>Detailed Description</h2>
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<p>The ObjectDescription class provides information about Phonon objects.</p>
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<p>Phonon currently uses this class to describe audio effects and audio output devices - using the typedefs <a href="phonon-objectdescription.html#AudioOutputDevice-typedef">AudioOutputDevice</a> and <a href="phonon-objectdescription.html#EffectDescription-typedef">EffectDescription</a>. The type of an ObjectDescription is also described through the <a href="phonon-objectdescription.html#ObjectDescriptionType-enum">ObjectDescriptionType</a> enum. Objects of the same <a href="phonon-objectdescription.html#ObjectDescriptionType-enum">type</a> are uniquely identified by an <a href="phonon-objectdescription.html#index">index</a>().</p>
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<p>The class gives a <a href="phonon-objectdescription.html#description">description</a>() and a <a href="phonon-objectdescription.html#name">name</a>() of the object, both of which are strings appropriate for end users of a Phonon application. You can also check whether the device or effect described is <a href="phonon-objectdescription.html#isValid">valid</a>. This does not guarantee that the device or effect functions as expected, but that the ObjectDescription describes an existing device or effect.</p>
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<p>Audio output devices and effect descriptions are used to select the audio output device to be used for playback and to create effects; we show examples of this in the snippet below. The available descriptions can be fetched with <a href="phonon-backendcapabilities.html#availableAudioOutputDevices">availableAudioOutputDevices()</a> and <a href="phonon-backendcapabilities.html#availableAudioEffects">availableAudioEffects()</a> static functions in the <a href="phonon-backendcapabilities.html">Phonon::BackendCapabilities</a> namespace</p>
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<pre class="cpp"> <span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span>Phonon<span class="operator">::</span>EffectDescription<span class="operator">></span> effectDescriptions <span class="operator">=</span>
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Phonon<span class="operator">::</span>BackendCapabilities<span class="operator">::</span>availableAudioEffects();
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<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span>Phonon<span class="operator">::</span>AudioOutputDevice<span class="operator">></span> audioOutputDevices <span class="operator">=</span>
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Phonon<span class="operator">::</span>BackendCapabilities<span class="operator">::</span>availableAudioOutputDevices();
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foreach (Phonon<span class="operator">::</span>EffectDescription effectDescription<span class="operator">,</span> effectDescriptions) {
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Phonon<span class="operator">::</span>Effect <span class="operator">*</span>effect <span class="operator">=</span> <span class="keyword">new</span> Phonon<span class="operator">::</span>Effect(effectDescription);
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<span class="comment">// ... Do something with the effect, like insert it into a media graph</span>
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}
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Phonon<span class="operator">::</span>AudioOutput <span class="operator">*</span>audioOutput <span class="operator">=</span> <span class="keyword">new</span> Phonon<span class="operator">::</span>AudioOutput;
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audioOutput<span class="operator">-</span><span class="operator">></span>setOutputDevice(audioOutputDevices<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>);</pre>
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<p>Other types of ObjectDescriptions might be possible in the future, e.g., descriptions of audio capture devices, such as microphones.</p>
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</div>
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<p><b>See also </b><a href="phonon-objectdescription.html#AudioOutputDevice-typedef">Phonon::AudioOutputDevice</a>, <a href="phonon-objectdescription.html#EffectDescription-typedef">Phonon::EffectDescription</a>, <a href="phonon-capabilities.html">Capabilities Example</a>, and <a href="phonon-module.html">Phonon Module</a>.</p>
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<!-- @@@ObjectDescription -->
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<div class="func">
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<h2>Member Function Documentation</h2>
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<!-- $$$description[overload1]$$$description -->
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<h3 class="fn"><a name="description"></a><span class="type"><a href="qstring.html">QString</a></span> ObjectDescription::<span class="name">description</span> () const</h3>
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<p>Returns a more extensive description than the <a href="phonon-objectdescription.html#name">name</a>() function.</p>
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<p>For example, in the case of <a href="phonon-objectdescription.html#AudioOutputDevice-typedef">AudioOutputDevice</a>s, this text should make clear which sound source is described; this is sometimes hard to describe or understand from just the name.</p>
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<p>The text is appropriate to present to an end user in for example tool tips of items, with the <a href="phonon-objectdescription.html#name">name</a>()'s as text, in a <a href="qcombobox.html">QComboBox</a>.</p>
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<!-- @@@description -->
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<!-- $$$index[overload1]$$$index -->
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<h3 class="fn"><a name="index"></a><span class="type">int</span> ObjectDescription::<span class="name">index</span> () const</h3>
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<p>Returns a unique identifier for this <a href="phonon-objectdescription.html">ObjectDescription</a>. Used internally to distinguish between the descriptions.</p>
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<p>Notice that the identifiers are only unique to the type of description, e.g., <a href="phonon-objectdescription.html#AudioOutputDevice-typedef">AudioOutputDevice</a> or <a href="phonon-objectdescription.html#EffectDescription-typedef">EffectDescription</a>.</p>
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<!-- @@@index -->
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<!-- $$$isValid[overload1]$$$isValid -->
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<h3 class="fn"><a name="isValid"></a><span class="type">bool</span> ObjectDescription::<span class="name">isValid</span> () const</h3>
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<p>Returns true if the device or effect described exists.</p>
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<p>An <a href="phonon-objectdescription.html">ObjectDescription</a> that is invalid, will also have an <a href="phonon-objectdescription.html#index">index</a>() of -1.</p>
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<p><b>See also </b><a href="phonon-objectdescription.html#index">index</a>().</p>
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<!-- @@@isValid -->
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<!-- $$$name[overload1]$$$name -->
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<h3 class="fn"><a name="name"></a><span class="type"><a href="qstring.html">QString</a></span> ObjectDescription::<span class="name">name</span> () const</h3>
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<p>Returns a string appropriate for a user to select between object descriptions, e.g., from a <a href="qcombobox.html">QComboBox</a>.</p>
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<p><b>See also </b><a href="phonon-objectdescription.html#description">description</a>().</p>
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<!-- @@@name -->
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<!-- $$$property[overload1]$$$propertyconstchar* -->
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<h3 class="fn"><a name="property"></a><span class="type"><a href="qvariant.html">QVariant</a></span> ObjectDescription::<span class="name">property</span> ( const <span class="type">char</span> * <i>name</i> ) const</h3>
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<p>Returns the property named <i>name</i>. A property can be used for extended information, such as the manufacturer of a sound card. The information will usually be given as text.</p>
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<p>If the property is not set an invalid <a href="qvariant.html">QVariant</a> is returned.</p>
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<p>Qt's backends do not use properties at the time of this writing.</p>
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<p><b>See also </b><a href="phonon-objectdescription.html#propertyNames">propertyNames</a>().</p>
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<!-- @@@property -->
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<!-- $$$propertyNames[overload1]$$$propertyNames -->
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<h3 class="fn"><a name="propertyNames"></a><span class="type"><a href="qlist.html">QList</a></span><<span class="type"><a href="qbytearray.html">QByteArray</a></span>> ObjectDescription::<span class="name">propertyNames</span> () const</h3>
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<p>Properties can be used for extended information about a <a href="phonon-objectdescription.html">ObjectDescription</a>, e.g., a manufacturer of a sound card. The information will usually be given text.</p>
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<p>This function returns all names that return valid data when <a href="phonon-objectdescription.html#property">property</a>() is called.</p>
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<p>Currently, Qt backends do not use properties for their object descriptions.</p>
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<p><b>See also </b><a href="phonon-objectdescription.html#property">property</a>().</p>
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<!-- @@@propertyNames -->
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<!-- $$$operator!=[overload1]$$$operator!=constObjectDescription& -->
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<h3 class="fn"><a name="operator-not-eq"></a><span class="type">bool</span> ObjectDescription::<span class="name">operator!=</span> ( const <span class="type">ObjectDescription</span> & <i>otherDescription</i> ) const</h3>
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<p>Returns <tt>false</tt> if this <a href="phonon-objectdescription.html">ObjectDescription</a> describes the same as <i>otherDescription</i>; otherwise, returns <tt>true</tt>.</p>
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<!-- @@@operator!= -->
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<!-- $$$operator==[overload1]$$$operator==constObjectDescription& -->
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<h3 class="fn"><a name="operator-eq-eq"></a><span class="type">bool</span> ObjectDescription::<span class="name">operator==</span> ( const <span class="type">ObjectDescription</span> & <i>otherDescription</i> ) const</h3>
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<p>Returns <tt>true</tt> if this <a href="phonon-objectdescription.html">ObjectDescription</a> describes the same object as <i>otherDescription</i>; otherwise, returns <tt>false</tt>.</p>
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<!-- @@@operator== -->
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</div>
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<div class="relnonmem">
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<h2>Related Non-Members</h2>
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<!-- $$$AudioOutputDevice -->
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<h3 class="fn"><a name="AudioOutputDevice-typedef"></a>typedef Phonon::<span class="name">AudioOutputDevice</span></h3>
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<p>This typedef of <a href="phonon-objectdescription.html">ObjectDescription</a> describes an audio output device, such as soundcards (with different drivers), sound servers, or other virtual outputs like playback on a different computer on the network.</p>
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<p>A list of available devices is given by the backend with Backendcapabilities::availableAudioOutputDevices()</p>
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<pre class="cpp"> <span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span>Phonon<span class="operator">::</span>AudioOutputDevice<span class="operator">></span> audioOutputDevices <span class="operator">=</span>
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Phonon<span class="operator">::</span>BackendCapabilities<span class="operator">::</span>availableAudioOutputDevices();</pre>
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<!-- @@@AudioOutputDevice -->
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<!-- $$$EffectDescription -->
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<h3 class="fn"><a name="EffectDescription-typedef"></a>typedef Phonon::<span class="name">EffectDescription</span></h3>
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<p>EffectDescription gives a description of an <a href="phonon-overview.html#processors">audio effect</a>. It is a typedef of the <a href="phonon-objectdescription.html">ObjectDescription</a> class. Please see its class description for details.</p>
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<p>EffectDescription is used to create audio <a href="phonon-effect.html">Effect</a>s, which can be inserted into a media graph, altering an audio stream.</p>
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<p><b>See also </b><a href="phonon-objectdescription.html">Phonon::ObjectDescription</a>, <a href="phonon-capabilities.html">Capabilities Example</a>, and <a href="demos-qmediaplayer.html">Media Player</a>.</p>
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<!-- @@@EffectDescription -->
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<!-- $$$ObjectDescriptionType$$$AudioOutputDeviceType$$$EffectType$$$AudioChannelType$$$SubtitleType$$$AudioCaptureDeviceType -->
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<h3 class="fn"><a name="ObjectDescriptionType-enum"></a>enum Phonon::<span class="name">ObjectDescriptionType</span></h3>
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<p>This enum defines the type of information that is contained in a <a href="phonon-objectdescription.html">ObjectDescription</a> object.</p>
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<table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tblval">Value</th><th class="tbldscr">Description</th></tr>
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<tr><td class="topAlign"><tt>Phonon::AudioOutputDeviceType</tt></td><td class="topAlign"><tt>0</tt></td><td class="topAlign">An audio output device (<a href="phonon-objectdescription.html#AudioOutputDevice-typedef">AudioOutputDevice</a>). This can be soundcards (with different drivers), sound servers, or other virtual outputs like playback on a different computer on the network.</td></tr>
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<tr><td class="topAlign"><tt>Phonon::EffectType</tt></td><td class="topAlign"><tt>1</tt></td><td class="topAlign">An audio effect (<a href="phonon-objectdescription.html#EffectDescription-typedef">EffectDescription</a>).</td></tr>
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</table>
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<!-- @@@ObjectDescriptionType -->
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