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<li>Qt 5.2</li>
<li><a href="qtmultimedia-index.html">Qt Multimedia</a></li>
<li>Changes in Qt Multimedia</li>
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Qt 5.2.1 Reference Documentation</li>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#new-features-in-qt-5-0">New features in Qt 5.0</a></li>
<li class="level1"><a href="#removed-features">Removed features</a></li>
<li class="level1"><a href="#changed-features">Changed features</a></li>
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<h1 class="title">Changes in Qt Multimedia</h1>
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<p>The Qt Multimedia module in Qt 5 combines (and replaces) two older modules, namely the Qt Multimedia module from Qt 4.x, and Qt Multimedia Kit module from Qt Mobility. Existing code that uses Qt Multimedia from Qt 4 can be ported with minimal effort, but porting code that uses Qt Multimedia Kit may be a more involved process. The <a href="#changed-features">changed features</a> section highlights changes relevant to porting.</p>
<p>Also, note that widget-based classes, such as QVideoWidget, are now in a separate module called Qt Multimedia Widgets.</p>
<a name="new-features-in-qt-5-0"></a>
<h2>New features in Qt 5.0</h2>
<p>There are a number of new features in Qt Multimedia:</p>
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<li>Expanded QML API</li>
<li>In addition to the <a href="qml-qtmultimedia-video.html">Video</a> QML type, there is now the option of using <a href="qml-qtmultimedia-mediaplayer.html">MediaPlayer</a> and <a href="qml-qtmultimedia-videooutput.html">VideoOutput</a> together</li>
<li>QML <a href="qml-qtmultimedia-torch.html">Torch</a> class</li>
<li>New <a href="qaudiorecorder.html">QAudioRecorder</a> class</li>
<li>Volume support for <a href="qaudiooutput.html">QAudioOutput</a> and <a href="qaudioinput.html">QAudioInput</a></li>
<li>More examples and documentation</li>
<li><a href="qsound.html">QSound</a> moved from Qt GUI to Qt Multimedia</li>
<li><a href="qsoundeffect.html">QSoundEffect</a> available to C++ now, as well as QML</li>
<li>FM Radio Data System classes and types now available (<a href="qradiodata.html">QRadioData</a>, <a href="qml-qtmultimedia-radiodata.html">RadioData</a>)</li>
<li>Various other API improvements and bugfixes</li>
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<h2>Removed features</h2>
<p>A number of classes or features previously offered in Qt Multimedia or Qt Multimedia Kit have been removed.</p>
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<thead><tr class="qt-style"><th >Removed feature</th><th >Notes</th></tr></thead>
<tr valign="top" class="odd"><td >QMediaImageViewer</td><td >This class (and related controls and services) were removed since their functionality was not suitable for many applications</td></tr>
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<a name="changed-features"></a>
<h2>Changed features</h2>
<p>A number of classes previously offered in Qt Multimedia or Qt Multimedia Kit have changed in ways that may affect previously written code. This table highlights such changes.</p>
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<thead><tr class="qt-style"><th >Changed feature</th><th >Notes</th></tr></thead>
<tr valign="top" class="odd"><td ><tt>qmake</tt> project file changes</td><td >Previously, to use Qt Multimedia Kit, the <tt>qmake</tt> project file must contain<pre class="cpp">CONFIG <span class="operator">+</span><span class="operator">=</span> mobility
MOBILITY <span class="operator">+</span><span class="operator">=</span> multimedia</pre>
<p>Now, you only need to write</p>
<pre class="cpp">QT <span class="operator">+</span><span class="operator">=</span> multimedia</pre>
<p>Or, if you want to use the widget classes,</p>
<pre class="cpp">QT <span class="operator">+</span><span class="operator">=</span> multimedia multimediawidgets</pre>
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<tr valign="top" class="even"><td >Namespaces</td><td >The <tt>QtMultimediaKit</tt> namespace has been renamed to <a href="qmultimedia.html">QMultimedia</a>. This affects a few enumerations, namely <tt>SupportEstimate</tt>, <tt>EncodingQuality</tt>, <tt>EncodingMode</tt> and <tt>AvailabilityStatus</tt>. Searching and replacing <tt>QtMultimediaKit</tt> with <tt>QMultimedia</tt> will greatly aid porting efforts. Metadata have been split off into their own namespace, <a href="qmediametadata.html">QMediaMetaData</a>.</td></tr>
<tr valign="top" class="odd"><td >Metadata types</td><td >In Qt Multimedia Kit, pre-defined metadata keys were enumerations in the <tt>QtMultimediaKit</tt> namespace. These pre-defined keys have been changed to string literals in the <tt>QMediaMetaData</tt> namespace, for consistency with extended keys.</td></tr>
<tr valign="top" class="even"><td >Metadata accessor methods</td><td >In Qt Multimedia Kit, there were two different families of methods to access metadata. Functions such as <tt>QMediaObject::metaData()</tt> operated on pre-defined metadata using enumerated keys, while functions such as <tt>QMediaObject::extendedMetaData()</tt> operated on extended metadata using string keys. Qt 5 combines both families into one (e.g. <a href="qmediaobject.html#metaData">QMediaObject::metaData</a>()), which can operate on both pre-defined and extended metadata, using string keys.</td></tr>
<tr valign="top" class="odd"><td >Qt Metatype registration</td><td >Qt 5 registers many more classes and types with the meta-object system than before. If you have previously applied Q_DECLARE_METATYPE macros to any Qt Multimedia class, you will probably need to remove them.</td></tr>
<tr valign="top" class="even"><td ><a href="qsoundeffect.html">QSoundEffect</a> availability</td><td >The <a href="qml-qtmultimedia-soundeffect.html">SoundEffect</a> QML type was publicly accessible in Qt Multimeda Kit, and now the C++ version is officially public too. If your code contains the previously undocumented <a href="qsoundeffect.html">QSoundEffect</a>, you may need to update it.</td></tr>
<tr valign="top" class="odd"><td >Camera controls</td><td >A large number of the camera controls (<a href="qcameraimageprocessingcontrol.html">QCameraImageProcessingControl</a>, <a href="qcamerafocuscontrol.html">QCameraFocusControl</a>, etc.) have been updated to address a number of design flaws. In particular, a number of discrete accessor methods have been collapsed into parametrized methods, and the ranges or data types of some parameters have been adjusted.</td></tr>
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