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Unified Video Decoder

Unified Video Decoder is hardware component of graphic engines produced by American company AMD. The decoder is designed for hardware decoding of video data bit streams, compressed by H.264, MPEG-2 and VC-1 video codecs. Initially UVD was developed by the Canadian company ATI Technologies. However soon AMD company has bought it and continued the development, improvement and supporting of UVD. UVD is a part of ATI Avivo HD technology that includes software components needed for operations with UVD.

The UVD specifications are supported by API DirectX Video Acceleration for Microsoft Windows operating systems and Microsoft Xbox 360 game consoles. Video, contained on these two hard-and-software based platforms and encoded by the means of H.624, MPEG-2 and VC-1, can be hardwarily accelerated with the help of UVD. In addition to that, the media player should support DXVA AND UVD for hardware acceleration.

For the UNIX similar operating systems, Linux included, the UVD support is realized through API X-Video Bitstream Acceleration.

Unified Video Decoder is based on the ATI video processor named Xilleon. It is available on all Radeon HD 2000 graphic engines, except Radeon HD 2900. The decoder in question processes the decoding of H.264/AVC and VC-1 video codecs on graphic engines. However after-processing of video is carried out by GPU shaders. MPEG-2 is also not supported by UVD, being fulfilled on shaders.

The Unified Video Decoder meets the requirements of specifications and performance of Blu-Ray and HD DVD. It is able to decode H.624 video streams with a bit rate up to 40 Mbps. UVD is supported by Context adaptive binary arithmetic coding for H.624.

UVD processes the variable length code, context adaptive variable length coding, frequency transform, context-adaptive binary arithmetic coding, inloop deblocking and pixel predition. The post-processing of video that includes deinterlacing, denoising, scaling and resizing is performed on shaders.

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