<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- changes.qdoc --> <title>Changes in Qt Multimedia | Qt Multimedia 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtmultimedia-index.html">Qt Multimedia</a></td><td >Changes in Qt Multimedia</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtmultimedia-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <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> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">Changes in Qt Multimedia</h1> <span class="subtitle"></span> <!-- $$$changes.html-description --> <div class="descr"> <a name="details"></a> <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="changes.html#changed-features">changed features</a> section highlights changes relevant to porting.</p> <p>Also, note that widget-based classes, such as <a href="qvideowidget.html">QVideoWidget</a>, are now in a separate module called Qt Multimedia Widgets.</p> <a name="new-features-in-qt-5-0"></a> <h2 id="new-features-in-qt-5-0">New features in Qt 5.0</h2> <p>There are a number of new features in Qt Multimedia:</p> <ul> <li>Expanded QML API</li> <li>In addition to the <a href="qml-multimedia.html#video">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> </ul> <a name="removed-features"></a> <h2 id="removed-features">Removed features</h2> <p>A number of classes or features previously offered in Qt Multimedia or Qt Multimedia Kit have been removed.</p> <div class="table"><table class="generic" width="70%"> <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> </table></div> <a name="changed-features"></a> <h2 id="changed-features">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> <div class="table"><table class="generic" width="70%"> <thead><tr class="qt-style"><th >Changed feature</th><th >Notes</th></tr></thead> <tr valign="top" class="odd"><td ><code>qmake</code> project file changes</td><td >Previously, to use Qt Multimedia Kit, the <code>qmake</code> 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> </td></tr> <tr valign="top" class="even"><td >Namespaces</td><td >The <code>QtMultimediaKit</code> namespace has been renamed to <a href="qmultimedia.html">QMultimedia</a>. This affects a few enumerations, namely <code>SupportEstimate</code>, <code>EncodingQuality</code>, <code>EncodingMode</code> and <code>AvailabilityStatus</code>. Searching and replacing <code>QtMultimediaKit</code> with <code>QMultimedia</code> 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 <code>QtMultimediaKit</code> namespace. These pre-defined keys have been changed to string literals in the <code>QMediaMetaData</code> 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 <code>QMediaObject::metaData()</code> operated on pre-defined metadata using enumerated keys, while functions such as <code>QMediaObject::extendedMetaData()</code> 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-multimedia.html#soundeffect">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> </table></div> </div> <!-- @@@changes.html --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. 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