[Bug 784069] New: Add support for OMX_UseBuffer in gstomxvideodec

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784069

            Bug ID: 784069
           Summary: Add support for OMX_UseBuffer in gstomxvideodec
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-omx
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: julien.isorce at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

For example this allows the gstomxdecoder to directly fill the pixmaps coming
from the video sink.

It avoids a buffer copy when the decoder uses a pool provided by a downstream
element.

If it fails to setup buffers with OMX_UseBuffer the decoders should fallback to
usual OMX_AllocateBuffer code path.

It will allow to test on desktop the GstOMXBufferPool->other_pool management
which is currently only used in the OMX_UseEGLImage case, i.e. on Rpi. So
easier for maintenance and enhancements.

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