[Bug 779642] vaapi: direct download/upload crashes in gallium backends

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779642

--- Comment #6 from Julien Isorce <julien.isorce at gmail.com> ---
VaDeriveImage is implemented in gallium/va, but only for RGB likes at the
moment, so not for NV12. But gstreamer-vaapi currently properly fallback if
that direct upload fails.

About the download direct, the drive image succeeds because the pipeline above
convert to RGB. But it sounds like the mapped buffer is not accessible: "error:
Cannot access memory at address 0x7ffff7ff9000" and the it crashes.

For a moment I thought this was because of the WRITE only flag here
https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/state_trackers/va/buffer.c#n128
but I get same result with PIPE_TRANSFER_READ_WRITE .

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