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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 >QMediaObject</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="#properties">Properties</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#signals">Signals</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">QMediaObject Class</h1>
<!-- $$$QMediaObject-brief -->
<p>The <a href="qmediaobject.html">QMediaObject</a> class provides a common base for multimedia objects. <a href="#details">More...</a></p>
<!-- @@@QMediaObject -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QMediaObject&gt;</span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += multimedia</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherited By:</td><td class="memItemRight bottomAlign"> <p><a href="qaudiodecoder.html">QAudioDecoder</a>, <a href="qcamera.html">QCamera</a>, <a href="qmediaplayer.html">QMediaPlayer</a>, and <a href="qradiotuner.html">QRadioTuner</a></p>
</td></tr></table></div><ul>
<li><a href="qmediaobject-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><a href="qmediaobject.html#notifyInterval-prop">notifyInterval</a></b> : int</li>
</ul>
<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#dtor.QMediaObject">~QMediaObject</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QMultimedia::AvailabilityStatus </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#availability">availability</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QStringList </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#availableMetaData">availableMetaData</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#bind">bind</a></b>(QObject *<i>object</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#isAvailable">isAvailable</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#isMetaDataAvailable">isMetaDataAvailable</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QVariant </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#metaData">metaData</a></b>(const QString &amp;<i>key</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#notifyInterval-prop">notifyInterval</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QMediaService *</td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#service">service</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#notifyInterval-prop">setNotifyInterval</a></b>(int <i>milliSeconds</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#unbind">unbind</a></b>(QObject *<i>object</i>)</td></tr>
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<a name="signals"></a>
<h2 id="signals">Signals</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#availabilityChanged">availabilityChanged</a></b>(bool <i>available</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#availabilityChanged-1">availabilityChanged</a></b>(QMultimedia::AvailabilityStatus <i>availability</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#metaDataAvailableChanged">metaDataAvailableChanged</a></b>(bool <i>available</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#metaDataChanged">metaDataChanged</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#metaDataChanged-1">metaDataChanged</a></b>(const QString &amp;<i>key</i>, const QVariant &amp;<i>value</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#notifyIntervalChanged">notifyIntervalChanged</a></b>(int <i>milliseconds</i>)</td></tr>
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<a name="protected-functions"></a>
<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="qmediaobject.html#QMediaObject">QMediaObject</a></b>(QObject *<i>parent</i>, QMediaService *<i>service</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#addPropertyWatch">addPropertyWatch</a></b>(QByteArray const &amp;<i>name</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmediaobject.html#removePropertyWatch">removePropertyWatch</a></b>(QByteArray const &amp;<i>name</i>)</td></tr>
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<a name="details"></a>
<!-- $$$QMediaObject-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qmediaobject.html">QMediaObject</a> class provides a common base for multimedia objects.</p>
<p>It provides some basic functionality that is common to other high level classes like <a href="qmediaplayer.html">QMediaPlayer</a>, <a href="qaudiodecoder.html">QAudioDecoder</a> and <a href="qcamera.html">QCamera</a>, including availability and meta-data functionality, as well as functionality to connect media objects with support classes like <a href="qmediaplaylist.html">QMediaPlaylist</a>.</p>
<p>The higher level <a href="qmediaobject.html">QMediaObject</a> derived classes provide the actual multimedia functionality, by internally using a <a href="qmediaservice.html">QMediaService</a>. Each media object hosts a <a href="qmediaservice.html">QMediaService</a> and uses the <a href="qmediacontrol.html">QMediaControl</a> interfaces implemented by the service to implement its API. These controls can be accessed from the media object if necessary, but in general the useful functionality can be accessed from the higher level classes.</p>
<p>Most media objects when constructed will request a new <a href="qmediaservice.html">QMediaService</a> instance, but some like <a href="qmediarecorder.html">QMediaRecorder</a> and <a href="qaudiorecorder.html">QAudioRecorder</a> will share a service with another object.</p>
</div>
<p><b>See also </b><a href="qmediaservice.html">QMediaService</a> and <a href="qmediacontrol.html">QMediaControl</a>.</p>
<!-- @@@QMediaObject -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$notifyInterval-prop$$$notifyInterval$$$setNotifyIntervalint$$$notifyIntervalChangedint -->
<h3 class="fn" id="notifyInterval-prop"><a name="notifyInterval-prop"></a><span class="name">notifyInterval</span> : <span class="type">int</span></h3>
<p>The interval at which notifiable properties will update.</p>
<p>The interval is expressed in milliseconds, the default value is 1000.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><span class="name"><b>notifyInterval</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setNotifyInterval</b></span>(int <i>milliSeconds</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qmediaobject.html#notifyIntervalChanged">notifyIntervalChanged</a></b></span>(int <i>milliseconds</i>)</td></tr>
</table></div>
<p><b>See also </b><a href="qmediaobject.html#addPropertyWatch">addPropertyWatch</a>() and <a href="qmediaobject.html#removePropertyWatch">removePropertyWatch</a>().</p>
<!-- @@@notifyInterval -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QMediaObject[overload1]$$$QMediaObjectQObject*QMediaService* -->
<h3 class="fn" id="QMediaObject"><a name="QMediaObject"></a><code>[protected] </code>QMediaObject::<span class="name">QMediaObject</span>(<span class="type">QObject</span> *<i>parent</i>, <span class="type"><a href="qmediaservice.html">QMediaService</a></span> *<i>service</i>)</h3>
<p>Constructs a media object which uses the functionality provided by a media <i>service</i>.</p>
<p>The <i>parent</i> is passed to QObject.</p>
<p>This class is meant as a base class for multimedia objects so this constructor is protected.</p>
<!-- @@@QMediaObject -->
<!-- $$$~QMediaObject[overload1]$$$~QMediaObject -->
<h3 class="fn" id="dtor.QMediaObject"><a name="dtor.QMediaObject"></a>QMediaObject::<span class="name">~QMediaObject</span>()</h3>
<p>Destroys this media object.</p>
<!-- @@@~QMediaObject -->
<!-- $$$addPropertyWatch[overload1]$$$addPropertyWatchQByteArrayconst& -->
<h3 class="fn" id="addPropertyWatch"><a name="addPropertyWatch"></a><code>[protected] </code><span class="type">void</span> QMediaObject::<span class="name">addPropertyWatch</span>(<span class="type">QByteArray</span> const &amp;<i>name</i>)</h3>
<p>Watch the property <i>name</i>. The property's notify signal will be emitted once every <code>notifyInterval</code> milliseconds.</p>
<p><b>See also </b><a href="qmediaobject.html#notifyInterval-prop">notifyInterval</a>.</p>
<!-- @@@addPropertyWatch -->
<!-- $$$availability[overload1]$$$availability -->
<h3 class="fn" id="availability"><a name="availability"></a><code>[virtual] </code><span class="type"><a href="qmultimedia.html#AvailabilityStatus-enum">QMultimedia::AvailabilityStatus</a></span> QMediaObject::<span class="name">availability</span>() const</h3>
<p>Returns the availability of the functionality offered by this object.</p>
<p>In some cases the functionality may not be available (for example, if the current operating system or platform does not provide the required functionality), or it may be temporarily unavailable (for example, audio playback during a phone call or similar).</p>
<!-- @@@availability -->
<!-- $$$availabilityChanged[overload1]$$$availabilityChangedbool -->
<h3 class="fn" id="availabilityChanged"><a name="availabilityChanged"></a><code>[signal] </code><span class="type">void</span> QMediaObject::<span class="name">availabilityChanged</span>(<span class="type">bool</span> <i>available</i>)</h3>
<p>Signal emitted when the availability state has changed to <i>available</i>.</p>
<p><b>Note:</b> Signal <i>availabilityChanged</i> is overloaded in this class. To connect to this one using the function pointer syntax, you must specify the signal type in a static cast, as shown in this example:<pre class="cpp">

  connect(mediaObject<span class="operator">,</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span>(<span class="type"><a href="qmediaobject.html#QMediaObject">QMediaObject</a></span><span class="operator">::</span><span class="operator">*</span>)(bool)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type"><a href="qmediaobject.html#QMediaObject">QMediaObject</a></span><span class="operator">::</span>availabilityChanged)<span class="operator">,</span>
      <span class="operator">[</span><span class="operator">=</span><span class="operator">]</span>(bool available){ <span class="comment">/* ... */</span> });

</pre>
<!-- @@@availabilityChanged -->
<!-- $$$availabilityChanged$$$availabilityChangedQMultimedia::AvailabilityStatus -->
<h3 class="fn" id="availabilityChanged-1"><a name="availabilityChanged-1"></a><code>[signal] </code><span class="type">void</span> QMediaObject::<span class="name">availabilityChanged</span>(<span class="type"><a href="qmultimedia.html#AvailabilityStatus-enum">QMultimedia::AvailabilityStatus</a></span> <i>availability</i>)</h3>
<p>Signal emitted when the availability of the service has changed to <i>availability</i>.</p>
<p><b>Note:</b> Signal <i>availabilityChanged</i> is overloaded in this class. To connect to this one using the function pointer syntax, you must specify the signal type in a static cast, as shown in this example:<pre class="cpp">

  connect(mediaObject<span class="operator">,</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span>(<span class="type"><a href="qmediaobject.html#QMediaObject">QMediaObject</a></span><span class="operator">::</span><span class="operator">*</span>)(<span class="type"><a href="qmultimedia.html">QMultimedia</a></span><span class="operator">::</span>AvailabilityStatus)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type"><a href="qmediaobject.html#QMediaObject">QMediaObject</a></span><span class="operator">::</span>availabilityChanged)<span class="operator">,</span>
      <span class="operator">[</span><span class="operator">=</span><span class="operator">]</span>(<span class="type"><a href="qmultimedia.html">QMultimedia</a></span><span class="operator">::</span>AvailabilityStatus availability){ <span class="comment">/* ... */</span> });

</pre>
<!-- @@@availabilityChanged -->
<!-- $$$availableMetaData[overload1]$$$availableMetaData -->
<h3 class="fn" id="availableMetaData"><a name="availableMetaData"></a><span class="type">QStringList</span> QMediaObject::<span class="name">availableMetaData</span>() const</h3>
<p>Returns a list of keys there is meta-data available for.</p>
<!-- @@@availableMetaData -->
<!-- $$$bind[overload1]$$$bindQObject* -->
<h3 class="fn" id="bind"><a name="bind"></a><code>[virtual] </code><span class="type">bool</span> QMediaObject::<span class="name">bind</span>(<span class="type">QObject</span> *<i>object</i>)</h3>
<p>Bind <i>object</i> to this <a href="qmediaobject.html">QMediaObject</a> instance.</p>
<p>This method establishes a relationship between this media object and a helper object. The nature of the relationship depends on both parties. This methods returns true if the helper was successfully bound, false otherwise.</p>
<p>Most subclasses of <a href="qmediaobject.html">QMediaObject</a> provide more convenient functions that wrap this functionality, so this function rarely needs to be called directly.</p>
<p>The object passed must implement the <a href="qmediabindableinterface.html">QMediaBindableInterface</a> interface.</p>
<p><b>See also </b><a href="qmediabindableinterface.html">QMediaBindableInterface</a>.</p>
<!-- @@@bind -->
<!-- $$$isAvailable[overload1]$$$isAvailable -->
<h3 class="fn" id="isAvailable"><a name="isAvailable"></a><code>[virtual] </code><span class="type">bool</span> QMediaObject::<span class="name">isAvailable</span>() const</h3>
<p>Returns true if the service is available for use.</p>
<!-- @@@isAvailable -->
<!-- $$$isMetaDataAvailable[overload1]$$$isMetaDataAvailable -->
<h3 class="fn" id="isMetaDataAvailable"><a name="isMetaDataAvailable"></a><span class="type">bool</span> QMediaObject::<span class="name">isMetaDataAvailable</span>() const</h3>
<p>Returns true if there is meta-data associated with this media object, else false.</p>
<!-- @@@isMetaDataAvailable -->
<!-- $$$metaData[overload1]$$$metaDataconstQString& -->
<h3 class="fn" id="metaData"><a name="metaData"></a><span class="type">QVariant</span> QMediaObject::<span class="name">metaData</span>(const <span class="type">QString</span> &amp;<i>key</i>) const</h3>
<p>Returns the value associated with a meta-data <i>key</i>.</p>
<p>See the list of predefined <a href="qmediametadata.html">meta-data keys</a>.</p>
<!-- @@@metaData -->
<!-- $$$metaDataAvailableChanged[overload1]$$$metaDataAvailableChangedbool -->
<h3 class="fn" id="metaDataAvailableChanged"><a name="metaDataAvailableChanged"></a><code>[signal] </code><span class="type">void</span> QMediaObject::<span class="name">metaDataAvailableChanged</span>(<span class="type">bool</span> <i>available</i>)</h3>
<p>Signals that the <i>available</i> state of a media object's meta-data has changed.</p>
<!-- @@@metaDataAvailableChanged -->
<!-- $$$metaDataChanged[overload1]$$$metaDataChanged -->
<h3 class="fn" id="metaDataChanged"><a name="metaDataChanged"></a><code>[signal] </code><span class="type">void</span> QMediaObject::<span class="name">metaDataChanged</span>()</h3>
<p>Signals that this media object's meta-data has changed.</p>
<p>If multiple meta-data elements are changed, metaDataChanged(const QString &amp;key, const QVariant &amp;value) signal is emitted for each of them with metaDataChanged() changed emitted once.</p>
<p><b>Note:</b> Signal <i>metaDataChanged</i> is overloaded in this class. To connect to this one using the function pointer syntax, you must specify the signal type in a static cast, as shown in this example:<pre class="cpp">

  connect(mediaObject<span class="operator">,</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span>(<span class="type"><a href="qmediaobject.html#QMediaObject">QMediaObject</a></span><span class="operator">::</span><span class="operator">*</span>)()<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type"><a href="qmediaobject.html#QMediaObject">QMediaObject</a></span><span class="operator">::</span>metaDataChanged)<span class="operator">,</span>
      <span class="operator">[</span><span class="operator">=</span><span class="operator">]</span>(){ <span class="comment">/* ... */</span> });

</pre>
<!-- @@@metaDataChanged -->
<!-- $$$metaDataChanged$$$metaDataChangedconstQString&constQVariant& -->
<h3 class="fn" id="metaDataChanged-1"><a name="metaDataChanged-1"></a><code>[signal] </code><span class="type">void</span> QMediaObject::<span class="name">metaDataChanged</span>(const <span class="type">QString</span> &amp;<i>key</i>, const <span class="type">QVariant</span> &amp;<i>value</i>)</h3>
<p>Signal the changes of one meta-data element <i>value</i> with the given <i>key</i>.</p>
<p><b>Note:</b> Signal <i>metaDataChanged</i> is overloaded in this class. To connect to this one using the function pointer syntax, you must specify the signal type in a static cast, as shown in this example:<pre class="cpp">

  connect(mediaObject<span class="operator">,</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span>(<span class="type"><a href="qmediaobject.html#QMediaObject">QMediaObject</a></span><span class="operator">::</span><span class="operator">*</span>)(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span><span class="operator">,</span> <span class="keyword">const</span> <span class="type">QVariant</span> <span class="operator">&amp;</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type"><a href="qmediaobject.html#QMediaObject">QMediaObject</a></span><span class="operator">::</span>metaDataChanged)<span class="operator">,</span>
      <span class="operator">[</span><span class="operator">=</span><span class="operator">]</span>(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>key<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QVariant</span> <span class="operator">&amp;</span>value){ <span class="comment">/* ... */</span> });

</pre>
<!-- @@@metaDataChanged -->
<!-- $$$notifyIntervalChanged -->
<h3 class="fn" id="notifyIntervalChanged"><a name="notifyIntervalChanged"></a><code>[signal] </code><span class="type">void</span> QMediaObject::<span class="name">notifyIntervalChanged</span>(<span class="type">int</span> <i>milliseconds</i>)</h3>
<p>Signal a change in the notify interval period to <i>milliseconds</i>.</p>
<p><b>Note:</b> Notifier signal for property <a href="qmediaobject.html#notifyInterval-prop">notifyInterval</a>. </p><!-- @@@notifyIntervalChanged -->
<!-- $$$removePropertyWatch[overload1]$$$removePropertyWatchQByteArrayconst& -->
<h3 class="fn" id="removePropertyWatch"><a name="removePropertyWatch"></a><code>[protected] </code><span class="type">void</span> QMediaObject::<span class="name">removePropertyWatch</span>(<span class="type">QByteArray</span> const &amp;<i>name</i>)</h3>
<p>Remove property <i>name</i> from the list of properties whose changes are regularly signaled.</p>
<p><b>See also </b><a href="qmediaobject.html#notifyInterval-prop">notifyInterval</a>.</p>
<!-- @@@removePropertyWatch -->
<!-- $$$service[overload1]$$$service -->
<h3 class="fn" id="service"><a name="service"></a><code>[virtual] </code><span class="type"><a href="qmediaservice.html">QMediaService</a></span> *QMediaObject::<span class="name">service</span>() const</h3>
<p>Returns the media service that provides the functionality of this multimedia object.</p>
<!-- @@@service -->
<!-- $$$unbind[overload1]$$$unbindQObject* -->
<h3 class="fn" id="unbind"><a name="unbind"></a><code>[virtual] </code><span class="type">void</span> QMediaObject::<span class="name">unbind</span>(<span class="type">QObject</span> *<i>object</i>)</h3>
<p>Detach <i>object</i> from the <a href="qmediaobject.html">QMediaObject</a> instance.</p>
<p>Unbind the helper object from this media object. A warning will be generated if the object was not previously bound to this object.</p>
<p><b>See also </b><a href="qmediabindableinterface.html">QMediaBindableInterface</a>.</p>
<!-- @@@unbind -->
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