[Bug 796918] New: implement dmabuf export on encoder input buffers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796918

            Bug ID: 796918
           Summary: implement dmabuf export on encoder input buffers
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-omx
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gdesmott at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The following patches adds support for exporting buffers dmabuf input buffers
to upstream enabling use to do things like 'v4l2src io-mode=dmabuf-import !
omxh264enc'.

This feature has only be tested on the zynq but should be easily re-usable on
other platforms as well.

While doing so I also improved the buffers life cycle management and fixed
various related issues.

I did some testing on the pi and didn't spot any regression.

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