[Bug 779146] New: dmabuf: be able to negotiate tiled surfaces

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779146

            Bug ID: 779146
           Summary: dmabuf: be able to negotiate tiled surfaces
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: scott.d.phillips at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

The memory format natively supported by intel-vaapi-driver is Y-tiled NV12 for
YUV 420 surfaces. Currently the gstreamer-vaapi dmabuf allocator only allocates
non-tiled surfaces which the intel-vaapi-driver needs to then tile before
encoding/untile after decoding.

Having some way of negotiating support for tiling would save this unnecessary
tiling or untiling step. I would appreciate input on the best way to implement
this. Should it be a new video format, like NV12_128Y32? A video format is a
little funny to me because this is for dmabuf negotiation only and the tiled
plane will never be seen in virtual memory. Should there be some gem-specific
dmabuf allocation query parameters?

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