For example, neither ATI Radeon R520 series' AVIVO nor NVidia Geforce 7 series' PureVideo assist front-end bitstream/entropy decompression in VC-1 and H.264 - the host CPU performs this work. Unlike video acceleration blocks in previous generation GPUs, which demanded considerable host-CPU involvement, UVD offloads almost the entire video-decoder process for MPEG-2, VC-1, and H.264. It has context-adaptive binary arithmetic coding (CABAC) support and dual-stream decoding support, which would make picture-in-picture possible. The decoder meets the performance and profile requirements of Blu-ray and HD DVD, decoding H.264 bitstreams up to a bitrate of 40 Mbit/s. The UVD, as stated by AMD, handles decoding of H.264/AVC, and VC-1 video codecs almost entirely in hardware. The UVD is based on an ATI Xilleon video processor, incorporated into the same die of the GPU and part of the AVIVO HD for hardware decoding videos, along with the Advanced Video Processor (AVP). The Unified Video Decoder, previously called "Universal Video Decoder", or UVD in short, is the video decoding unit from ATI Technologies to support hardware decode of H.264 and VC-1 video codec standards, and being a part of AVIVO HD technology.
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