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UVD 4.2 was introduced with the AMD Radeon Rx 200 series and Kaveri APU. UVD 4 includes improved frame interpolation with H.264 decoder. UVD 3 also adds support for Blu-ray 3D stereoscopic displays. along with 120 Hz stereo 3D support, and is optimized to utilize less CPU processing power. UVD 3 adds support for additional hardware MPEG2 decoding (entropy decode), DivX and Xvid via MPEG-4 Part 2 decoding (entropy decode, inverse transform, motion compensation) and Blu-ray 3D via MVC (entropy decode, inverse transform, motion compensation, in-loop deblocking).
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The nature of UVD 2.2 being an incremental update to the UVD 2 can be accounted for this move. However, it was marketed under the same alias as "UVD 2 Enhanced" as the "special core-logic, available in RV770 and RV730 series of GPUs, for hardware decoding of MPEG2, H.264 and VC-1 video with dual-stream decoding". The UVD 2.2 features a re-designed local memory interface and enhances the compatibility with MPEG2/H.264/VC-1 videos. Performance improvements allow dual video stream decoding and Picture-in-Picture mode.
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The UVD 2 features full bitstream decoding of H.264/MPEG-4 AVC, VC-1, as well as iDCT level acceleration of MPEG2 video streams. The UVD saw a refresh with the release of the Radeon HD 4000 series products. But UVD+ was also being marketed as simply UVD. UVD+ support HDCP for higher resolution video streams. AMD has also stated that the UVD component being incorporated into the GPU core only occupies 4.7 mm² in area on 65 nm fabrication process node.Ī variation on UVD, called UVD+, was introduced with the Radeon HD 3000 series. Post-processing includes denoising, de-interlacing, and scaling/resizing.
UVD handles VLC/ CAVLC/ CABAC, frequency transform, pixel prediction and inloop deblocking, but passes the post processing to the shaders. Previously, neither ATI Radeon R520 series' ATI Avivo nor NVidia Geforce 7 series' PureVideo assisted front-end bitstream/entropy decompression in VC-1 and H.264 - the host CPU performed this work. MPEG-2 decode is also supported, but the bitstream/entropy decode is not performed for MPEG-2 video in hardware. Unlike video acceleration blocks in previous generation GPUs, which demanded considerable host-CPU involvement, UVD offloads the entire video-decoder process for VC-1 and H.264 except for video post-processing, which is offloaded to the shaders. It has context-adaptive binary arithmetic coding (CABAC) support for H.264/AVC. 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. MPEG-2 decoding is not performed within UVD, but in the shader processors. In early versions of UVD, video post-processing is passed to the pixel shaders and OpenCL kernels. The UVD technology is based on the Cadence Tensilica Xtensa processor, which was originally licensed by ATI Technologies Inc. UVD, as stated by AMD, handles decoding of H.264/AVC, and VC-1 video codecs entirely in hardware. The UVD is based on an ATI Xilleon video processor, which is incorporated onto the same die as the GPU and is part of the ATI Avivo HD for hardware video decoding, along with the Advanced Video Processor (AVP).
5.1 Hardware video hardware technologies.
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