Audio stops after seeking AVI clip with MP3 audio (special contents without proper key samples)

During seek in AVI, nearest Sync sample was searched both for
audio and video. Sync samples are useful only in case of
video. We can ignore Sync field for non-video tracks.

Change-Id: Ibaeda8f14afb83905e19087625a7d72fb1b3c8d6
Signed-off-by: Arulselvan M <arulselvan.m@intel.com>
Signed-off-by: Jin Wei <wei.a.jin@intel.com>
Correct the time returned by AudioPlayer::getMediaTime

The change 80a68deec52c9a1b47215ed68526206ec88197f8 was added to
eliminate returning negative media positions.

In the change all negative values of realTimeOffset were discarded.
The value realTimeOffset accounts for the latency and the
number of samples played since last feeding the AudioTrack and is
generally negative. By discarding this value for negative values the
time returned does not account for latency or the number of samples
played.

Change-Id: I470450934228732e34539c227365a225be74ccc8