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The Design of AVS Decoder Based on MW301 Multimedia Chip Platform

Author: LiuPeng
Tutor: WangMingJiang
School: Harbin Institute of Technology
Course: Microelectronics and Solid State Electronics
Keywords: AVS video decoder H.264 decode module Multi-core Processor
CLC: TN919.81
Type: Master's thesis
Year: 2008
Downloads: 10
Quote: 0
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Abstract


Recent years, with the rapid developing of the technology of multimedia and telecommunication, the demand to media become higher and higher. Nowadays the morden multimedia technology such as mobile video, digital TV network of Standard-Definition and High-Definition, and 3G network which will change the mode of communication of people, all of these bring forward the higher demand to the technology of media code/decode.AVS is the standard of audio and video coding protocol, which is proposed by China as Independent Intellectual Property Rights. Compared with international popular new standards H.264 and MPEG-4, AVS has some characteristics such as easier in algorithm implement, higher efficiency in coding, etc. In the field of high-definition video decoding, AVS even overtakes H.264. In this paper, two aspects of AVS realization are introduced: the research of AVS video decoding algorithm in C language model and the decoding hardware demo on the MW301 platform.The system structure, technic characteristics and coding/decoding flow of AVS are analized in this paper. There are four main steps in the process of decoding, including entropy decoding, anti-quantitative/anti-transformation, intra-frame prediction/inter-frame prediction, loop filter. Basing on C language, an algorithm model for MW301 is accomplished.In this paper the platform of MW301, which is the newest multi-media processor of Runsil Technology Limited Company, is choosed to implement the AVS hardware demo. The MW301 contain five configurable CPU cores. CPU1 is the main processor which deals with the input/output of media stream and the decoding of audio; CPU2~5 complete the encoding/decoding of video.In the paper the optimization of C code according to the MW301 is accomplished. The module of motion compensation which cost large operation is writen in assemble language. The VLC table which is frequent use in decoding process is read in on-chip memory by its size. The YUV data after the filtering process is saved off-chip by DMA channel. Thereby, the times of read off-chip memory have been reduced, and the efficiency of decoding improved.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication > Image coding
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