怯场架构

Question

Is there a documentation explaining android Stagefright architecture?

Can I get some pointers on these subjects?

Answer 1

A good explanation of stagefright is provided athttp://freepine.blogspot.com/2010/01/overview-of-stagefrighter-player.html .

There is a new playback engine implemented by Google comes with Android 2.0 (ie, 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.

Answer 2

Look at thispost .

Also, Android player is built up using PacketVideo (PV) Player, and here comes the docs about it (beware of really slow transfer speed:) ):

• PVPlayer SDK Developer's Guide link 1 , link 2
• PVPlayer return codes link

Answer 3

Starting Gingerbread, it is Stagefright framework instead of PV framework. Above link has good info about the framework. If you have some specific questions, I may be able to help you out.

Thanks, Dolphin