Blackberry: Add a page with platform-specific documentation

Change-Id: Ic03c59523648ee25c419ec5d80122da9a717aa2d
Reviewed-by: Bernd Weimer <bweimer@rim.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

src/multimedia/doc/src/blackberry.qdoc

@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Research In Motion
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file.  Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: http://www.gnu.org/copyleft/fdl.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+\page blackberry.html
+\title BlackBerry
+\brief Platform notes for the BlackBerry Platform
+
+QtMultimedia supports BlackBerry devices that run the BB10 operating system.
+This page covers the availibility of different features on BB10.
+
+\section1 Implementation
+
+BB10 ships with a few different multimedia libraries. The main library for audio
+and video playback is \e mmrenderer. For low-latency output of raw audio samples,
+\e libasound, a variant of the Linux ALSA library, is available. Finally, for
+three-dimensional positional audio playback, \e OpenAL is supported and present
+on BB10.
+
+The QtMultimedia BlackBerry backend uses mmrenderer for media playback.
+
+For the positional audio classes in the \l {Positional Audio} {QtAudioEngine} QML
+module, OpenAL is used as on all other platforms.
+
+\section1 Supported Features
+
+Playback of audio and video with QMediaPlayer and related classes is supported.
+This includes the corresponding QML elements like MediaPlayer and VideoOutput.
+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 QMediaPlayer as well. Playlists as sources are also supported.
+
+mmrenderer does not allow access to the pixel data of video frames, hence QtMultimedia
+classes like QVideoFrame and QAbstractVideoSurface will not work since they require access
+to the image data. QVideoWidget and the VideoOutput QML element are implemented with an overlay window;
+mmrenderer creates a seperate 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.
+
+The \l {Positional Audio} {QtAudioEngine} QML module is fully supported, as it is based on OpenAL which is available
+in BB10.
+
+\section1 Unsupported Features
+
+Low-latency output and input of raw audio samples with QAudioOutput, QAudioInput and related classes is
+not yet supported. The SoundEffect QML element and QSoundEffect are based on these classes. In your
+QML file, use the MediaPlayer element instead of the SoundEffect element, as the APIs are nearly identical.
+
+QMediaPlayer does not support QIODevice-based streaming sources. However, streaming by specifying, for example,
+an HTTP URL as the source does work. In addition, QMediaPlayer does not yet provide metadata like
+the artist and album of the current track.
+
+Camera, radio and audio and video recording are not yet supported.
+*/

src/multimedia/doc/src/qtmultimedia-index.qdoc

@@ -115,6 +115,11 @@
       \li \l{Radio Overview}
      \endlist
 
+    \section2 Platform Notes
+     \list
+      \li \l{BlackBerry}
+     \endlist
+
     \section2 Reference
      \list
       \li \l{Qt Multimedia QML Types}{QML Types}