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  gstreamer-vaapi
  VA-API support to GStreamer

  Copyright (C) 2010-2011 Splitted-Desktop Systems
  Copyright (C) 2011-2014 Intel Corporation
  Copyright (C) 2011 Collabora Ltd.


License
-------

gstreamer-vaapi helper libraries and plugin elements are available
under the terms of the GNU Lesser General Public License v2.1+


Overview
--------

gstreamer-vaapi consists in a collection of VA-API based plugins for
GStreamer and helper libraries.

  * `vaapidecode' is used to decode JPEG, MPEG-2, MPEG-4:2, H.264 AVC,
    H.264 MVC, VP8, VC-1, WMV3 videos to VA surfaces, depending on the
    underlying hardware capabilities. This plugin is also able to
    implicitly download the decoded surface to raw YUV buffers.

  * `vaapiencode_<CODEC>' is used to encode into MPEG-2, H.264 AVC,
    H.264 MVC, JPEG, VP8 videos, depending on the actual value of
    <CODEC> (mpeg2, h264, etc.). By default, raw format bitstreams
    are generated, so the result may be piped to a muxer.
    e.g. qtmux for MP4 containers.

  * `vaapipostproc' is used to filter VA surfaces, for e.g. scaling,
    deinterlacing (bob, motion-adaptive, motion-compensated), noise
    reduction or sharpening. This plugin is also used to upload raw
    YUV pixels into VA surfaces.

  * `vaapisink' is used to render VA surfaces to an X11 or Wayland
    display. This plugin also features a "headless" mode (DRM) more
    suited to remote transcode scenarios, with faster throughput.


Features
--------

  * VA-API support from 0.29 to 0.37
  * JPEG, MPEG-2, MPEG-4, H.264 AVC, H.264 MVC, VP8 and VC-1 ad-hoc decoders
  * MPEG-2, H.264 AVC,H.264 MVC, JPEG and VP8 ad-hoc encoders
  * OpenGL rendering through VA/GLX or GLX texture-from-pixmap + FBO
  * Support for the Wayland display server
  * Support for headless decode pipelines with VA/DRM
  * Support for major HW video decoding solutions on Linux (AMD, Intel, NVIDIA)
  * Support for HW video encoding on Intel HD Graphics hardware
  * Support for VA Video Processing APIs (VA/VPP)
    - Scaling and color conversion
    - Image enhancement filters: Sharpening, Noise Reduction
    - Advanced deinterlacing: Motion-Adaptive, Motion-Compensated


Requirements
------------

Software requirements

  * GStreamer 1.2.x (up to including GStreamer 1.6):
      libglib2.0-dev (>= 2.28)
      libgstreamer1.0-dev (>= 1.2.0)
      libgstreamer-plugins-base1.0-dev (>= 1.2.0)
      libgstreamer-plugins-bad1.0-dev (>= 1.2.0)

  * Renderers:
      DRM: libva-dev (>= 1.1.0), libdrm-dev, libudev-dev
      X11: libva-dev (>= 1.0.1)
      GLX: libva-dev (>= 1.0.3)
      Wayland: libva-dev (>= 1.1.0), libwayland-dev (>= 0.95.0)

Hardware requirements

  * AMD platforms with UVD2 (XvBA supported)
  * Intel Eaglelake (G45)
  * Intel Ironlake, Sandybridge, Ivybridge, Haswell and Broadwell (HD Graphics)
  * Intel BayTrail
  * Intel Poulsbo (US15W)
  * Intel Medfield or Cedar Trail
  * NVIDIA platforms with PureVideo (VDPAU supported)


Usage
-----

  VA elements are automatically plugged into GStreamer pipelines. So,
  using playbin should work as is.
  However, here are a few alternate pipelines that could be manually
  constructed.

  * Play an H.264 video with an MP4 container in fullscreen mode
  $ gst-launch-1.0 -v filesrc location=/path/to/video.mp4 ! \
      qtdemux ! vaapidecode ! vaapisink fullscreen=true

  * Play a raw MPEG-2 interlaced stream
  $ gst-launch-1.0 -v filesrc location=/path/to/mpeg2.bits ! \
      mpegvideoparse ! vaapidecode ! vaapipostproc ! vaapisink

  * Convert from one pixel format to another, while also downscaling
  $ gst-launch-1.0 -v filesrc location=/path/to/raw_video.yuv ! \
      videoparse format=yuy2 width=1280 height=720 ! \
      vaapipostproc format=nv12 height=480 ! vaapisink

  * Encode a 1080p stream in raw I420 format into H.264
  $ gst-launch-1.0 -v filesrc location=/path/to/raw_video.yuv ! \
      videoparse format=i420 width=1920 height=1080 framerate=30/1 ! \
      vaapiencode_h264 rate-control=cbr tune=high-compression ! \
      qtmux ! filesink location=/path/to/encoded_video.mp4


Sources
-------

  gstreamer-vaapi is Open Source software, so updates to this
  framework are really easy to get.

  Stable source code releases can be found at:
  <http://www.freedesktop.org/software/vaapi/releases/gstreamer-vaapi/>

  Git repository for work-in-progress changes is available at:
  <https://github.com/01org/gstreamer-vaapi>


Reporting Bugs
--------------

  Bugs can be reported in the GNOME Bugzilla system at:
  <https://bugzilla.gnome.org/enter_bug.cgi?product=gstreamer-vaapi>

  From the main page, new bugs can be reported through New -> Other ->
  gstreamer-vaapi product.