[Bug 745730] New: gl: Putting GstGLAllocator as first allocator in ALLOCATION query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745730

            Bug ID: 745730
           Summary: gl: Putting GstGLAllocator as first allocator in
                    ALLOCATION query
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: critical
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: slomo at coaxion.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently GL elements are putting the GstGLAllocator as the first allocator in
the ALLOCATION query. As long as the caps contain the GL caps feature that is
completely ok, but otherwise not.

What can happen otherwise is that the GL allocator is tried to be set on a
GstVideoBufferPool or GstBufferPool, which then completely fails because
GstGLAllocator can't use the normal GstAllocator::alloc() function.

For sysmem caps, only allocators that work normally should be at the first
position.

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