[Bug 680796] New: Crash because of misaligned frame data

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=680796
  GStreamer | gst-ffmpeg | git

           Summary: Crash because of misaligned frame data
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-ffmpeg
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rawoul at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I get a crash when using a libav decoder in my pipeline and when direct
rendering is enabled. In this case the output frame buffers are allocated by a
downstream buffer pool.

The crash happens in the put_pixels16_sse2() function in
libavcodec/x86/dsputil_mmx.c:455. It happens because this function assumes that
the output data is aligned on 16 bytes boundaries, and it is not the case. I
can confirm that changing the movdqa instructions in this function to movdqu
fixes the problem.

The problem should be fixed in gst-ffmepg by forcing the plane data of the
output buffers allocated from the buffer pool to be 16-bytes aligned.

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