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Change copyrights and license headers from Nokia to Digia
Change-Id: I8b2ed2e09e9beb46bdda354017c29f00be6ae76f
Reviewed-by: Akseli Salovaara <akseli.salovaara@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
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This commit integrates the Download class with the media playback
classes in the backend, to implement Progressive Download.
Note that this PDL implementation has one drawback: when video
playback is paused due to shortage of data (i.e. due to the download
being temporarily stalled), the display goes black. This is because,
when the end of the currently-downloaded data is reached, the
playback session is closed. When more data becomes available, the
clip is re-opened, a seek is done to reach the previous playback
position, and playback is re-started. Closing the playback session
closes the video stack's connection to the display, thereby causing
the video widget to go black while more data is buffered.
This is a consequence of the level in the native video stack at which
the Phonon integration is done: managing a network stall without
requiring the playback session to be closed would require integration
below the MMF client API, specifically at the MMF controller level.
Task-number: QTBUG-10769
Reviewed-by: Derick Hawcroft
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The backend accesses the resource file path via MediaSource::url().
A small patch to Phonon was required to enable this, because by
default, Phonon passes a QIODevice, rather than the resource file
path, to the backend.
The backend uses this path to create a QResource object, through which
the memory buffer into which the resource file has been read can be
accessed. This buffer is wrapped in a Symbian 8-bit descriptor and
passed to the OpenDesL() function of the appropriate MMF client
utility API.
Task-number: QTBUG-6562
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Task-number: QTBUG-4663
Reviewed-by: Frans Englich
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The main changes are:
1. MediaObject emits prefinishMark at the appropriate instant
2. MediaObject emits aboutToFinish at the appropriate instant
3. MediaObject switches to next source when playback completes
Task-number: QTBUG-6214
Reviewed-by: Frans Englich
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When clips are buffering (either at the start of playback, or
during playback, when buffer levels drop due to e.g. CPU, file system
or network load), the backend receives notification from the MMF.
While buffering is ongoing, the backend periodically queries the
filling status and emits a signal.
Task-number: QTBUG-4660
Reviewed-by: Frans Englich
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Because the MIME type of the stream cannot always be deduced from the
URL, we assume that it is a video stream. This is based on the
assumption that the video controllers will be capable of parsing
the container formats for audio-only, as well as video clips. Note
that this assumption may not hold on all devices.
Note that most implementations of the MMF client APIs do not support
HTTP streaming (a.k.a. progressive download). The backend has therefore
only been tested with RTSP streams - see the JIRA entry for further
details.
Task-number: QTBUG-4660
Reviewed-by: Frans Englich
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Task-number: QTBUG-4662
Reviewed-by: Frans Englich
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Reviewed-by: Gareth Stockwell
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MediaObject deals with an AbstractPlayer, so make sure we have the signals
declared in that base class, instead of individually in each sub-class.
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This extends the framework for being able to handle audio effects, largely
affecting how the audio chain is set up, connected and disconnected, and
therefore the Backend has been refactored slightly, and the class MediaNode
introduced, see its documentation.
In addition two effects has been written: BassBoost and AudioEqualizer.
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AbstractMediaPlayer
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Audio playback now working to the same extent as prior to the abstraction, with one regression: the initial volume level in the UI is set to zero, although playback is audible.
Some cleanup is required:
- Functionality common to AudioPlayer and VideoPlayer (e.g. tick timer, changeState function) should be moved into AbstractPlayer.
- Files may be opened by multiple instances of MediaObject at at time. For example, the musicplayer example app uses one instance to read file metadata, and one for the actual playback. In order to avoid KErrInUse errors from the file server, files must be opened with an EShare* flag and passed around by handle. At present this is done in a slightly hacky way (i.e. AbstractPlayer::setSource is renamed to setFileSource).
- The pointer held by MediaObject::m_player must be checked for nullness in many of the public API calls. This could be made cleaner by implementing a stub derivation of AbstractPlayer, which returns sensible default values. Note that, if functionality such as tick timer handling is going to be pushed upwards from AudioPlayer / VideoPlayer, we should add an intermediate class to the hierarchy so that the overhead of constructing DummyPlayer objects is minimised.
At present, media type (audio / video) is only recognised from file streams - this needs to be extended to include HTTP streaming aswell.
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As per discussions with Gareth.
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