Update the DCA parser with code from the latest FFmpeg.  Amended it to read the channel info from the packet header.  This allows us to properly recognize some DTS streams for passthrough without having to enable the decoder. (With some DTS streams FFmpeg couldn't read the parameters for the codec properly)
Merge pull request #6 from ouya/fix_dts_recognition

Update the DCA parser with code from the latest FFmpeg.  Amended it to r...