[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 #12 from Greg Rutz <greg at gsr-tek.com> 2013-07-03 14:59:22 UTC ---
I don't know of any other way to determine whether a stream was generated with
DCII.  In practice, DCII was differentiated from standard DVB by the SI carried
in out-of-band channels, so the stream alone would not be enough to tell.  In
the GStreamer world, a DCII MPEG2TS looks no different from a standard MPEG2TS
with these exceptions:

a) Video is always MPEG-2 (no I-frames) with stream_type of 0x80
b) Audio is only AC3 (no MPEG1/2 audio)

The "no I-frames" constraint is interesting.  I found the citation here
(http://www.tsreader.com/tsreader/support.html).

However, even with these constraints, there is nothing (at the demux level) we
can use to determine the type.

Here is a good read on DCII:

http://www.tsreader.com/mpeg/#dcii

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