[Bug 787593] New: kmssink: Export DMABuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787593

            Bug ID: 787593
           Summary: kmssink: Export DMABuf
    Classification: Platform
           Product: GStreamer
           Version: 1.13.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The following patchset makes kmssink export DMABuf from the Dumb buffers. This
is not the ideal way for zero-copy, but it allow to get downstream DMABuf
allocation working in certain cases. Tested with v4l2src, uvc driver, packed
YUY2 (to avoid stride issues).

  v4l2src io-mode=dmabuf-import ! kmssink

There is cache coherency issues that causes visual artefact, but that's also
visible the other way around (io-mode=dmabuf).

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