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<td >Qt 5.12</td><td ><a href="qtmultimedia-index.html">Qt Multimedia</a></td><td ><a href="multimedia-examples.html">Qt Multimedia Examples</a></td><td >Media Player Example</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>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#running-the-example">Running the Example</a></li>
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<h1 class="title">Media Player Example</h1>
<span class="subtitle"></span>
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<p>Playing audio and video.</p>
<!-- @@@multimediawidgets/player -->
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<div class="descr"> <a name="details"></a>
<p class="centerAlign"><img src="images/mediaplayerex.jpg" alt="" /></p><p><i>Media Player</i> demonstrates a simple multimedia player that can play audio and or video files using various codecs.</p>
<a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example from Qt Creator, open the <b>Welcome</b> mode and select the example from <b>Examples</b>. For more information, visit Building and Running an Example.</p>
<p>The example uses a <a href="qmediaplayer.html">QMediaPlayer</a> object passed into a <a href="qvideowidget.html">QVideoWidget</a> to control the video output. To give the application playlist capability we also use a QPlayList object.</p>
<p>To activate the various functions such as play and stop on the dialog, the button clicked events emit the play() and stop() signals, which are connected to the play() and stop() slots of <a href="qmediaplayer.html">QMediaPlayer</a>.</p>
<pre class="cpp">
connect(controls<span class="operator">,</span> SIGNAL(play())<span class="operator">,</span> player<span class="operator">,</span> SLOT(play()));
connect(controls<span class="operator">,</span> SIGNAL(pause())<span class="operator">,</span> player<span class="operator">,</span> SLOT(pause()));
connect(controls<span class="operator">,</span> SIGNAL(stop())<span class="operator">,</span> player<span class="operator">,</span> SLOT(stop()));
</pre>
<p>We can get the volume (and set our user interface representation)</p>
<pre class="cpp">
controls<span class="operator">-</span><span class="operator">></span>setVolume(player<span class="operator">-</span><span class="operator">></span>volume());
</pre>
<p>and we can make widget 'volume' changes change the volume</p>
<pre class="cpp">
connect(controls<span class="operator">,</span> SIGNAL(changeVolume(<span class="type">int</span>))<span class="operator">,</span> player<span class="operator">,</span> SLOT(setVolume(<span class="type">int</span>)));
</pre>
<p>The example also allows us to change various video properties by means of the <a href="qvideowidget.html">QVideoWidget</a> object. We can go to Full Screen mode with a single button click, and back again. Or if we press the "Color Options" dialog button we can have access to more subtle influences. The dialog has a set of sliders so that we can change the brightness, contrast, hue and saturation of the video being watched. The connect() statements are in pairs so that changes to either the user interface widget (the relevant slider) or the <a href="qvideowidget.html">QVideoWidget</a> object will update the other object.</p>
<pre class="cpp">
connect(brightnessSlider<span class="operator">,</span> SIGNAL(sliderMoved(<span class="type">int</span>))<span class="operator">,</span> videoWidget<span class="operator">,</span>
SLOT(setBrightness(<span class="type">int</span>)));
connect(videoWidget<span class="operator">,</span> SIGNAL(brightnessChanged(<span class="type">int</span>))<span class="operator">,</span>
brightnessSlider<span class="operator">,</span> SLOT(setValue(<span class="type">int</span>)));
connect(contrastSlider<span class="operator">,</span> SIGNAL(sliderMoved(<span class="type">int</span>))<span class="operator">,</span> videoWidget<span class="operator">,</span>
SLOT(setContrast(<span class="type">int</span>)));
connect(videoWidget<span class="operator">,</span> SIGNAL(contrastChanged(<span class="type">int</span>))<span class="operator">,</span> contrastSlider<span class="operator">,</span>
SLOT(setValue(<span class="type">int</span>)));
connect(hueSlider<span class="operator">,</span> SIGNAL(sliderMoved(<span class="type">int</span>))<span class="operator">,</span> videoWidget<span class="operator">,</span>
SLOT(setHue(<span class="type">int</span>)));
connect(videoWidget<span class="operator">,</span> SIGNAL(hueChanged(<span class="type">int</span>))<span class="operator">,</span> hueSlider<span class="operator">,</span>
SLOT(setValue(<span class="type">int</span>)));
connect(saturationSlider<span class="operator">,</span> SIGNAL(sliderMoved(<span class="type">int</span>))<span class="operator">,</span> videoWidget<span class="operator">,</span>
SLOT(setSaturation(<span class="type">int</span>)));
connect(videoWidget<span class="operator">,</span> SIGNAL(saturationChanged(<span class="type">int</span>))<span class="operator">,</span>
saturationSlider<span class="operator">,</span> SLOT(setValue(<span class="type">int</span>)));
</pre>
<p>Files:</p>
<ul>
<li><a href="qtmultimedia-multimediawidgets-player-histogramwidget-cpp.html">multimediawidgets/player/histogramwidget.cpp</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-histogramwidget-h.html">multimediawidgets/player/histogramwidget.h</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-main-cpp.html">multimediawidgets/player/main.cpp</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-player-cpp.html">multimediawidgets/player/player.cpp</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-player-h.html">multimediawidgets/player/player.h</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-player-pro.html">multimediawidgets/player/player.pro</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-playercontrols-cpp.html">multimediawidgets/player/playercontrols.cpp</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-playercontrols-h.html">multimediawidgets/player/playercontrols.h</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-playlistmodel-cpp.html">multimediawidgets/player/playlistmodel.cpp</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-playlistmodel-h.html">multimediawidgets/player/playlistmodel.h</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-videowidget-cpp.html">multimediawidgets/player/videowidget.cpp</a></li>
<li><a href="qtmultimedia-multimediawidgets-player-videowidget-h.html">multimediawidgets/player/videowidget.h</a></li>
</ul>
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