[Bug 734908] New: [API] Add gstgralloc library

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=734908
  GStreamer | gst-plugins-bad | git

           Summary: [API] Add gstgralloc library
    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: msameer at foolab.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=283596)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=283596)
proposed patch

Attaching a patch that adds a GstGralloc allocator with its GstGrallocMemory
and also a buffer pool (GstGrallocBufferPool) for usage with elements utilizing
the above mentioned allocator.

gralloc is the library used by Android to allocate android native buffers used
for graphics rendering and zero copy media decoding (Probably it has other uses
as well).

The only issue I see with the patch is I had to lie and set the format to
GST_VIDEO_FORMAT_I420 because I cannot use GST_VIDEO_FORMAT_ENCODED since it's
size is 0 and various GStreamer API dealing with allocation queries expect size
which is not 0

The allocator will be used to add support to gst-omx (And perhaps glimagesink
too)

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