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<li>Qt 5.2</li>
<li><a href="qtmultimedia-index.html">Qt Multimedia</a></li>
<li>BlackBerry</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="#implementation">Implementation</a></li>
<li class="level1"><a href="#supported-features">Supported Features</a></li>
<li class="level1"><a href="#unsupported-features">Unsupported Features</a></li>
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<h1 class="title">BlackBerry</h1>
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<p>Qt Multimedia supports BlackBerry devices that run the BB10 operating system. This page covers the availibility of different features on BB10.</p>
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<h2>Implementation</h2>
<p>BB10 ships with a few different multimedia libraries. The main library for audio and video playback is <i>mmrenderer</i>. For low-latency output of raw audio samples, <i>libasound</i>, a variant of the Linux ALSA library, is available. Finally, for three-dimensional positional audio playback, <i>OpenAL</i> is supported and present on BB10.</p>
<p>The Qt Multimedia BlackBerry backend uses mmrenderer for media playback.</p>
<p>For the positional audio classes in the <a href="qtaudioengine-qmlmodule.html">Qt Audio Engine</a> QML module, OpenAL is used as on all other platforms.</p>
<p>For recording videos and taking photos, the camapi library is used.</p>
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<h2>Supported Features</h2>
<p>Playback of audio and video with <a href="qmediaplayer.html">QMediaPlayer</a> and related classes is supported. This includes the corresponding QML elements like <a href="qml-qtmultimedia-mediaplayer.html">MediaPlayer</a> and <a href="qml-qtmultimedia-videooutput.html">VideoOutput</a>. Since the playback is delegated to mmrenderer, the supported formats are the same as in mmrenderer. As mmrenderer supports streaming from HTTP and other URLs, this is supported in <a href="qmediaplayer.html">QMediaPlayer</a> as well. Playlists as sources are also supported.</p>
<p>mmrenderer does not allow access to the pixel data of video frames, hence Qt Multimedia classes like <a href="qvideoframe.html">QVideoFrame</a> and <a href="qabstractvideosurface.html">QAbstractVideoSurface</a> will not work since they require access to the image data. QVideoWidget and the <a href="qml-qtmultimedia-videooutput.html">VideoOutput</a> QML element are implemented with an overlay window; mmrenderer creates a separate window displaying a video and puts that on top of the Qt application. As a consequence, no other widget or QML element can be put on top of the video, and QML shaders have no effect.</p>
<p>The <a href="qtaudioengine-qmlmodule.html">Qt Audio Engine</a> QML module is fully supported, as it is based on OpenAL which is available in BB10.</p>
<p>The <a href="qml-qtmultimedia-camera.html">QCamera</a> support includes recording of videos and taking photos. The viewfinder is available through QCameraViewfinder and the <a href="qml-qtmultimedia-videooutput.html">VideoOutput</a> QML element.</p>
<p>Note: To use the camera on BB10, your application needs the 'access_shared', 'use_camera' and 'record_audio' permissions set in the bar-descriptor.xml file.</p>
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<h2>Unsupported Features</h2>
<p>Low-latency output and input of raw audio samples with <a href="qaudiooutput.html">QAudioOutput</a>, <a href="qaudioinput.html">QAudioInput</a> and related classes is not yet supported. The <a href="qml-qtmultimedia-soundeffect.html">SoundEffect</a> QML element and <a href="qsoundeffect.html">QSoundEffect</a> are based on these classes. In your QML file, use the <a href="qml-qtmultimedia-mediaplayer.html">MediaPlayer</a> element instead of the <a href="qml-qtmultimedia-soundeffect.html">SoundEffect</a> element, as the APIs are nearly identical.</p>
<p><a href="qmediaplayer.html">QMediaPlayer</a> does not support QIODevice-based streaming sources. However, streaming by specifying, for example, an HTTP URL as the source does work. In addition, <a href="qmediaplayer.html">QMediaPlayer</a> does not yet provide metadata like the artist and album of the current track.</p>
<p>Radio and audio recording are not yet supported.</p>
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