[Bug 690149] New: [mpeg4videoparse] support divx and add GMC info in caps

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=690149
  GStreamer | gst-plugins-bad | 1.x

           Summary: [mpeg4videoparse] support divx and add GMC info in
                    caps
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rawoul at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=231463)
 View: https://bugzilla.gnome.org/attachment.cgi?id=231463
 Review: https://bugzilla.gnome.org/review?bug=690149&attachment=231463

mpeg4videoparse: handle divx caps

Hi,

I have attached two patches to allow better integration with hardware mpeg4
decoders.

The first patch allows parsing DivX videos, since they are standard MPEG-4 part
2 videos. We probably could remove the divx caps altogether and just use
video/mpeg caps, just like Tim did for XviD.

The second patch exports the number of sprite warping points when GMC is
enabled. Hardware decoders usually only support 1 sprite warping point, so it
allows to filter out those videos or decode them in software instead. Wikipedia
states: "Xvid specifies three warp points for its implementation of global
motion compensation as opposed to the single warp point implementation of
DivX", but I've seen DivX files with 2 warping points, so that's why we also
need to parse DivX videos.

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