GitLab

Support for EOS, DISCONTINUITY, and DISCONTINUITY with
 a PTS.

- in IAndroidBufferQueue structure, added buffer type
- modified AdvancedBufferHeader structure to have a buffer
 type-specific structure that contains all the items for each
 buffer
- added parsing of items when enqueueing a buffer
- enforce buffer size enqueue to be a multiple of MPEG-2 TS
 block size for buffer of the corresponding types
- when enqueueing a buffer on an empty queue, implemented
 an asynchronous notification on StreamPlayer to consume
 the newly queued buffer. Verified this kicks off playback
 after having starved the framework for buffers.
- report unknown duration when using AndroidBufferQueue

Change-Id: I9bde97a6c6ffca7d376b4963313b820b35f50a26