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The main motivation for VAAPI (Video Acceleration API) is to enable
hardware accelerated video decode/encode at various entry-points
(VLD, IDCT, Motion Compensation etc.) for the prevailing coding
standards today (MPEG-2, MPEG-4 ASP/H.263, MPEG-4 AVC/H.264, and
VC-1/VMW3). Extending XvMC was considered, but due to its original
design for MPEG-2 MotionComp only, it made more sense to design an
interface from scratch that can fully expose the video decode
capabilities in today's GPUs.
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