[Bug 693000] codecparsers: mpeg2: fix default quantizer matrix for intra blocks

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=693000
  GStreamer | gst-plugins-bad | git

--- Comment #1 from Gwenole Beauchesne <gb.devel at gmail.com> 2013-02-01 16:57:58 UTC ---
I think I would finally opt for solution (i) instead due to existing practice
in drivers and also because we just ask the parser to parse the source
bitstream not to necessarily interpret results from it. So, the idea here is to
just hand out the original QM matrices as is, i.e. in zigzag scan order, as in
the original bitstream and let upper layers perform conversions, if necessary.

I would prepare two patches, one for making sure all matrices remain in zigzag
scan order, and another one to provide utility functions to convert from zigzag
scan order to raster scan order.

What do you think? Thanks.

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