[Bug 732281] New: new element: inteldmabufupload

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732281
  GStreamer | gst-plugins-bad | git

           Summary: new element: inteldmabufupload
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: george.kiagiadakis at collabora.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


As part of my work implementing some experimental dmabuf support for
waylandsink, I have implemented an element that can upload video buffers to
dmabuf buffers allocated from the Intel DRM/PRIME stack.

The reason for creating this element was to test dmabuf support in waylandsink,
simply because I don't have any other hardware that can produce dmabuf buffers
and that I could use with GStreamer.

The element is based on GstBaseTransform. It provides a custom buffer pool,
which allocates buffer objects using libdrm_intel and exports them to dmabuf
objects. The GstMemory of those buffers is allocated from the
GstDmabufAllocator. This buffer pool is provided upstream, so either upstream
uses it and we have a zero-copy upload, or upstream doesn't use it, in which
case this element will copy the contents of the upstream buffers into these
dmabuf buffers.

The src caps are transformed to have a "memory:dmabuf" caps feature.

Example usage:
  gst-launch-1.0 videotestsrc ! inteldmabufupload ! waylandsink

The code can be found in this branch:
http://cgit.collabora.com/git/user/gkiagia/gst-plugins-bad.git/log/?h=inteldmabufupload

Note that this element will obviously only work on systems with Intel GPUs and
it also requires booting a recent linux kernel with the drm.rnodes=1 option on
the kernel command line.

I am submitting this element because I feel it might seem useful to other
developers for testing as well. I don't know of any use case where it would be
useful for end users. Also note that waylandsink support for dmabuf is not
going to be merged at this point, because it is not standarized in wayland yet.

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