[Bug 755072] vaapi: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755072

--- Comment #16 from Julien Isorce <julien.isorce at gmail.com> ---
Done here:
https://github.com/CapOM/gstreamer-vaapi/commits/dmabuf_with_and_without_caps_feature

Last-1 patch should just be split in 2: dmabuf without then with feature.

You would need patch for gst-plugins-base:
https://bug759358.bugzilla-attachments.gnome.org/attachment.cgi?id=317223
and for gstglupload:
https://github.com/CapOM/gst-plugins-bad/commit/f274539bc47f300624dee52d304f65cafcd459bb

Nicolas: mapping of dmabuf created by exporting a VASurface fails on desktop
with: "gst_fd_mem_map: 0x7f39880051c0: fd 26: mmap failed: Permission denied".
See l195 here
https://github.com/CapOM/gstreamer-vaapi/commit/ffceae0c0cd099967f6bc3b1a27451151550e70a#diff-bec9172c05be682d331c790d8a50ba95R195.

I did not expected it but it was actually good to test switch case where map
fail and then switch to feature. See regression test list in that branch.

The most important thing is to agree on how the following pipelines behave:
https://github.com/CapOM/gstreamer-vaapi/commit/c450b7c7693b1e3417c96dbbc906c394416a6852.
I am planning to convert them to some automatic tests.
(gst-integration-testsuites ? gst-devtools/validate ?)

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