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The Design of Dual-DSP System and Optimization of AVS Video Ddecoder

Author: LeiQing
Tutor: LiuYunHai
School: Zhejiang University
Course: Information and Communication Engineering
Keywords: DM357 DM6437 Davinci AVS xDAIS / xDM Codec Engine
CLC: TN764
Type: Master's thesis
Year: 2010
Downloads: 112
Quote: 1
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Abstract


Video signal with an intuitive, vivid, comprehensive, and many other advantages, therefore, the theory and technology of the various video processing has been a hot research. In recent years, the video aspects of the increasingly wide range of applications, showing the huge market demand. Especially in the embedded space, updated the enhanced embedded video processing platforms are emerging to promote the practical use of the video processing technology, can be said that one of the embedded video processing technology has become the most vibrant areas of research. With the application of in-depth, the functionality of such systems a higher demand, this paper is to put forward a reasonable solution for this situation. In addition, as the basis of the video processing technology, the AVS video decoder embedded platform also has great practical significance. The main work consists of two parts, the first video processing system based on dual-DSP design, two Dayinci platform AVS video decoder implementation and optimization. The article begins with a brief introduction of embedded video processing technology research background and development at home and abroad, and then analyze the common needs of embedded video applications, ARM-based video co-processor DSP architecture based on two-chip processing programs. Optional chip for TI's DM357 and DM6437 DM357 ARM-side chip, responsible for the overall control of the system, and also comes with a video accelerator coprocessor assisted H.264 video encoding; while the DM6437 DSP-side The chip is specifically responsible for the calculation of a variety of video algorithms. Next, the article detailed description of the various modules of the system, including memory modules, video interface module and debug module, dual-DSP communication module, the I / O module. Finally, a brief introduction to the PCB design system. Part of software design, the paper first introduces the general method in the Dayinci platform software development, including technical connotation Davinci xDAIS-/ xDM algorithm standard, Codec Engine program framework, as well as application development in Dayinci main steps. AVS video decoder implementation on the DM6446 platform then described in detail, including the structure of the program the adjustment, IALG IDMA3 interface implementation. And its optimization. Focus on the use of the algorithm of cache, the efficient use of the space allocation algorithm as well as the algorithm of DMA resources, the process of using some redundancy overhead do fine processing. After these after optimization, the speed of the decoder has been significantly improved. This paper presents the the decoder test methods and test results. Finally, the article summarizes the design of software and hardware, and for improved direction.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Modulation technique and the modulator,demodulator and the demodulator > Decoder
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