[Bug 692312] New: codecparsers: vc1: fix bitplanes decoding

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=692312
  GStreamer | gst-plugins-bad | git

           Summary: codecparsers: vc1: fix bitplanes decoding
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: gb.devel at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=234121)
 View: https://bugzilla.gnome.org/attachment.cgi?id=234121
 Review: https://bugzilla.gnome.org/review?bug=692312&attachment=234121

codecparsers: vc1: fix bitplanes decoding

Hi, this patch fixes decoding of DIFF2 or NORM2 bitplanes with an odd number of
macroblocks. In particular, we need to account for the first bit that was
already parsed so that to avoid a buffer overflow after all pairs are parsed.

This fixes SA00040.vc1 conformance test with gstreamer-vaapi.

I plan to push this patch to gst-plugins-bad 0.10 and 1.0 branches too. Thanks.

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