WMF: more reliable video seeking.

When seeking, the presentation clock can enter an undefined state until
it is started again from the new position. Wait for the clock to be
restarted before scheduling the prerolled frames, otherwise these
frames might get a wrong presentation time.

Change-Id: I02cb3338239775b7ef5d206ec5aa1b26719ac978
Reviewed-by: Christian Stromme <christian.stromme@digia.com>
GStreamer: correctly get metadata from live sources.

For some unknown reason, "iradio-mode" was set to false on the
source element, which was preventing new metadata to be received
when playing live streams.

Task-number: QTBUG-37640
Change-Id: Ib90297e81e26a99c3dfc753bdcd5cbd1ee2f6764
Reviewed-by: Christian Stromme <christian.stromme@digia.com>
WMF: improve changing playback rate on a media player.

When going back to normal rate after playing in fast forward (greater
than 2x), playback seemed frozen for some amount of time (up to 8
seconds).
When playing in fast forward, only key frames are shown, ignoring all
the others. When returning to a normal rate, the source reader will
usually be pointing to a key frame in the future compared to the
player clock position, meaning that all the frames in between won't be
shown until the player clock catches up with the latest key frame that
was read.

When leaving fast-forward, we now reset the position on the player to
force the source reader to point back to the frame at the current clock
position and avoid the seamingly frozen playback.

Also, emit playbackRateChanged() signal when changing the playback
rate.

Change-Id: I4f04f0f250083378e94fb4a47f9f917abeaaf24e
Reviewed-by: Christian Stromme <christian.stromme@digia.com>
Fix some MediaPlayer properties returning wrong values.

Once the QML component is complete, don't cache any value anymore and
always ask the backend for the actual value.

Change-Id: I2c3ad55618e0532f713cfcc8258a70a1114fc975
Reviewed-by: Christian Stromme <christian.stromme@digia.com>
Android: Fix the signature for setOnInfoListener.

The argument part of the signature should be OnInfoListener and not
OnErrorListener.

Change-Id: I735fe1b0338b66c2f729254ed9e3251136781cbe
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>
Android: Use Q_GLOBAL_STATIC instead of a static QMap

Change-Id: I7b65e0874051c4ef504914a0bd66e8471ec34fa7
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>