[Bug 697892] mpegtsdemux: Add support for DigiCipher II stream type.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=697892
  GStreamer | gst-plugins-bad | 1.0.6

--- Comment #3 from Greg Rutz <greg at gsr-tek.com> 2013-04-15 16:18:17 UTC ---
Here is how both vlc and libav handle stream types in BluRay m2ts and standard
MPEG2 TS.  They identify the stream as being BluRay by looking for the
"registration_descriptor" in the PMT.  In the case of BluRay, it seems that
this descriptor's "format_identifier" field always contains a FOURCC value of
"HDMV".  Then, they both come to the same conclusion when interpreting the
stream_type field of the PMT for the 0x80 value, but in different orders.

In VLC:
The codec type is first set as MPEG2 video if the stream_type is 0x1, 0x2, or
0x80.  Later, if the PMT registration_descriptor contains the "HDMV" value, the
codec type is modified to be the BluRay LPCM audio type.

In libav:
If the PMT registration_descriptor contains the "HDMV" value, the codec type is
set to the BluRay LPCM audio type.  If a codec type has not yet been set after
executing the HDMV-specific code, the stream_type is checked again for other
non-BluRay types, which leads to the proper setting of MPEG2 video for the 0x80
stream_type.

In both libraries, all of the BluRay-specific stream types are handled this
way.  We could do the same thing in GStreamer -- handle BluRay stream types
separately.  If you all agree, I could put together another patch that tries to
solve the problem this way.

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