I'm thinking of adding this to a supported PPA which would be available
for 16.04 users. I hope archive re-org would fix issues with
main/universe build-deps once and for all, but it's not going to happen
for xenial.

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https://bugs.launchpad.net/bugs/1481832

Title:
  VA-API implementation for gallium missing

Status in mesa package in Ubuntu:
  Confirmed

Bug description:
  [needs-packaging] mesa
  Please include "gallium_drv_video.so" which is a native va-api state tracker 
for mesa(gallium).

  URL: http://mesa3d.sourceforge.net/
  URL: http://freedesktop.org/wiki/Software/vaapi/ #intel/vdpau
  License: http://www.mesa3d.org/license.html

  Notes:
  Currently (as of today) in ubuntu 15.10 nightly amd64, va-api(vaapi) on 
AMD/Ati radeon opensource display hardware is using a vdpau backend  0.7.4 by 
Splitted-Desktop Systems (wrapper) on gallium r600. Although its possible and 
probably preferred (better performance less copying) to use a native 
implementation which mesa(gallium) 10.4 and higher delivers in a form of a 
va-api state tracker.

  vainfo #current default setup vdpau backend
  libva info: VA-API version 0.38.0
  libva info: va_getDriverName() returns 0
  libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/r600_drv_video.so
  libva info: Found init function __vaDriverInit_0_37
  libva info: va_openDriver() returns 0
  vainfo: VA-API version: 0.38 (libva 1.6.0)
  vainfo: Driver version: Splitted-Desktop Systems VDPAU backend for VA-API - 
0.7.4
  vainfo: Supported profile and entrypoints
        VAProfileMPEG2Simple            :       VAEntrypointVLD
        VAProfileMPEG2Main              :       VAEntrypointVLD
        VAProfileMPEG4Simple            :       VAEntrypointVLD
        VAProfileMPEG4AdvancedSimple    :       VAEntrypointVLD
        VAProfileH264Baseline           :       VAEntrypointVLD
        VAProfileH264Main               :       VAEntrypointVLD
        VAProfileH264High               :       VAEntrypointVLD
        VAProfileVC1Advanced            :       VAEntrypointVLD

  The preferred setup needs that "gallium_drv_video.so" binary which is
  currently unavailable in ubuntu and debian. As an example I added a
  package/binary from archlinux. Copying the gallium_drv_video.so to
  /usr/lib/x86_64-linux-gnu/dri/ and symlinking(correcting) the
  libLLVM-3.6.so to arch-linux default /usr/lib/ location and exporting
  a variable was enough to make it work!
  https://www.archlinux.org/packages/extra/x86_64/libva-mesa-driver/
  #example by archlinux

  export LIBVA_DRIVER_NAME=gallium
  vainfo #preferred setup using gallium va-api from arch-linux (symlinked 
libLLVM-3.6.so to /usr/lib)
  libva info: VA-API version 0.38.0
  libva info: va_getDriverName() returns 0
  libva info: User requested driver 'gallium'
  libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/gallium_drv_video.so
  libva info: Found init function __vaDriverInit_0_38
  libva info: va_openDriver() returns 0
  vainfo: VA-API version: 0.38 (libva 1.6.0)
  vainfo: Driver version: mesa gallium vaapi
  vainfo: Supported profile and entrypoints
        VAProfileMPEG2Simple            :       VAEntrypointVLD
        VAProfileMPEG2Main              :       VAEntrypointVLD
        VAProfileMPEG4Simple            :       VAEntrypointVLD
        VAProfileMPEG4AdvancedSimple    :       VAEntrypointVLD
        VAProfileVC1Advanced            :       VAEntrypointVLD
        VAProfileH264Baseline           :       VAEntrypointVLD
        VAProfileH264Main               :       VAEntrypointVLD
        VAProfileH264High               :       VAEntrypointVLD

  I guess this binary "gallium_drv_video.so" might be available as a
  compile flag in the current mesa implementation... intel and vdpau has
  their own current implementation in a separate libva branch
  http://cgit.freedesktop.org/vaapi/libva/ ?

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