[Bug 794339] New: Add DRI3/Present extension support in ximagesink(xvimagesink??)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794339

            Bug ID: 794339
           Summary: Add DRI3/Present extension support in
                    ximagesink(xvimagesink??)
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bsreerenj at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

DRI3 has an extension which allows to convert DRM_PRIME_BUFFER to Pixmap and
present it on the screen using "Present" extension.

This could help to do zero-copy pipelines like
VAAPI_decdoe ! ximagesink
MediaSDK_decode ! ximagesink  

https://lwn.net/Articles/569701/

This is a PR against intel-vaapi-driver:
https://github.com/intel/intel-vaapi-driver/pull/369

Another third-party implementation:
https://github.com/intel/gstreamer-media-SDK/blob/master/gst-libs/mfx/x11/gstmfxwindow_x11.c#L469

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