[Bug 755072] vaapi: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

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

--- Comment #56 from Julien Isorce <julien.isorce at gmail.com> ---
I reworked it to re-use the existing allocator and pool:
https://github.com/CapOM/gstreamer-vaapi/commits/ceyusa_755072_dmabuf_allocator_vpp_decode

Victor I popped out the 4 last commit of you branch
https://github.com/ceyusa/gstreamer-vaapi/commits/755072 .

Then I added 16 commits on top of your branch.
The 10 first commits are to add dmabuf for gstvaapipluginbase and vpp.
The 6 last commits are to add dmabuf for the decoder.

vpp:
GST_GL_XINITTHREADS=1 GST_GL_API=gles2 GST_GL_PLATFORM=egl GST_GL_WINDOW=x11
gst-launch-1.0 filesrc location=serenity.mp4 ! qtdemux ! h264parse !
vaapih264dec ! vaapipostproc ! glimagesink

decoder:
GST_GL_XINITTHREADS=1 GST_GL_API=gles2 GST_GL_PLATFORM=egl GST_GL_WINDOW=x11
gst-launch-1.0 filesrc location=serenity.mp4 ! qtdemux ! h264parse !
vaapih264dec ! glimagesink

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