stagefright: Add AC4 support in MediaExtractor for MP4/TS
* Add AC4 mime type
* Add AC-4 support to TS extractor
** Extract PES private data and AC4 descriptor.
** Dequeue and parse AC-4 access unit and sync frame
** Validate AC4 elementary stream header and parse sampling rate.
* Add AC-4 support to MPEG4Extractor
** Parse AC-4 sample entry in MP4 and set AC-4 MIME
** Add AC-4 sync header to MPEG4 encapsulated AC-4 raw frame
* Add AC4 DSI Parser
** In order to populate the AudioPresentation objects we need to
extract the AC4 presentation information from the dsi that is
written to the MPEG4 file during muxing.
Change-Id: If84c24ca475cabf3e0d2bdf3e4850aeeb185a0de
Signed-off-by: Previr Rangroo <prang@dolby.com>
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