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Design and Implementation of the playback system based on AVS

Author: FuLiFang
Tutor: LuGuangHui
School: University of Electronic Science and Technology
Course: Software Engineering
Keywords: AVS Inter-Interplation DirectShow Filter
CLC: TN946
Type: Master's thesis
Year: 2008
Downloads: 80
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Abstract


With the development of multimedia technique recent years, the technique of video codecs grows rapidly. And several standards of digital image video codecs have been developed. But only the international standard H.264/AVC and domestic standard AVS (Audio Video Coding Standard) have got universal concern among these video codecs standards at present. Video codecs technique plays a critical role in the areas of digital television, high-definition television, video conference and multimedia communication, ect. AVS is one of the most advanced audio-video compress standards which are available, and it is provided with high compression ratio,good quality, relatively low complex hardware, proper bandwidth, wired and wireless to accomplish a serial applications of network multimedia and storage.At the same time, people carry on an extensive research of multi-media document. having already had numerous players of brands at home and abroad currently, but still have weakness in several parts, for example the contents that existed multi-media players product can broadcast is comparatively lack, even just one kind.And AVS has developed in our nation is still relatively not long, so the palyers that can play AVS media is much less. Foreign media file is mainly based on the H.264 and MPEG standards, therefore, foreign players almost can only paly these files.Therefore the development of an AVS palyer is very necessary and it is also a certain degree of difficulty.My pissertaion aimed at realizing and optimizing the AVS decoding correlative technique based on personal computer. According to analyzing the whole decoding flow, some key arithmetic were optimized, mainly including the inter interplation arithmetic, the extending of boundary arithmetic and adopting the butterfly transformation to instead of the multiplication of matrix. Compared with the unoptimized arithmetic, it shows that the optimized arithmetic has shortened the decoding time availably.First, after analyzing the AVS standard, the key decoding technique was introduced, and then the decoder was realized. Secondly, I optimized the flow of the decoding. And then resulted the decoding system in a package of the dll, simultaneity sevral important functions had been imported. Finally, two filters had been developed by the DirectShow technology. One filter is the source filter.Another is the decoding filter. Both of them make Windows Media Player support the local AVS media files. At the same time, a network server and client has been developed to realize that the AVS media file can be played through the Internet. Thereinto, the server is in charge of reading the local AVS files and the role of the client was to decode and paly the data which was received from the server.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > TV > Video recording, playback system
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