There is a new playback engine implemented
by Google comes with Android 2.0 (i.e, Stagefright), which seems to be quite
simple and straightforward compared with the OpenCORE solution.
- MediaExtractor is responsible for retrieving track data and the
corresponding meta data from the underlying file system or http stream;
- Leveraging OMX for decoding: there are two OMX plugins currently, adapting
to PV's software codec and vendor's hardware implementation respectively. And
there is a local implementation of software codecs which encapsulates PV's
decoder APIs directly;
- AudioPlayer is responsible for rendering audio, it also provides the
timebase for timing and A/V synchronization whenever audio track is
present;
- Depending on which codec is picked, a local or remote render will be created
for video rendering; and system clock is used as the timebase for video only
playback;
- AwesomePlayer works as the engine to coordinate the above modules, and is
finally connected into android media framework through the adapter of
StagefrightPlayer.
