[Bug 722345] New: directdf video sink crashes when used with ext_surface

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=722345
  GStreamer | gst-plugins-bad | 1.2.2

           Summary: directdf video sink crashes when used with ext_surface
    Classification: Platform
           Product: GStreamer
           Version: 1.2.2
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: etrousset at awox.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Crashes when used with est_sruface because trying to use dfb interface which is
null is this case.

There also is a bug when calculating the size of the buffer to allocate,
missing the bytes per pixel.

Fixed access to variable 'meta' that is null when using ext_surface has there
is no extra surface allocated in the case of ext_surface.

Also this patch uses BGR for RGB caps as i had color inversion that I used to
fixe with redmask, bluemask... caps, but that doesn't seem to existe anymore.

Here is a patch that fixes this issues.

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