[Bug 723849] New: matroska: add support for GRAY8, BGR and RGB video colourspaces in V_UNCOMPRESSED codec

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=723849
  GStreamer | gst-plugins-good | git

           Summary: matroska: add support for GRAY8, BGR and RGB video
                    colourspaces in V_UNCOMPRESSED codec
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vhdirk at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=268404)
 View: https://bugzilla.gnome.org/attachment.cgi?id=268404
 Review: https://bugzilla.gnome.org/review?bug=723849&attachment=268404

Proposed patch

Following the matroska specification, there is support for raw frames by using
the V_UNCOMPRESSED codec. 
The patch attached adds support for GRAY8, BGR and RGB colourspaces.

According to the specification
(http://matroska.org/technical/specs/index.html), all details about the used
colour space are to be put in the header's ColourSpace field, and it should
have the same value as in AVI.

For GRAY8 data, this is trivial, but for BGR/RGB less so, as the fourcc value
for BGR/RGB is 0. Therefore, the fourcc codes used in this patch originate from
what is used in MPlayer
(http://orion.lcg.ufrj.br/RPMS/src/mplayer/mplayer/vidix/fourcc.h)

There is currently no other player that supports raw GRAY8/BGR/RGB data in
matroska, though it is perfectly 'legal' according to the spec. Still, the
timestamp information with every frame is a big advantage in using matroska
over avi.

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