Transplant And Optimization Of MPEG4 Algorithm Based On DM642

With the increasing demand on Multimedia information, It is a hot research area where implement real-time and live video coding on low speed transmission channel. Main harvest of this paper was that it introduced a MPEG4 embedded video compression system which would be normally used in embedded multimedia area who request video compression.First of all, this paper introduced hardware characteristic of DM642 which included the structure of the CPU and memory, video peripheric, the parallel hardware structure, and configuration and application of CCS and DSP/BIOS, and made a analysis of the hardware traits which was favor to optimization. Aiming at video compression, highlight of this part was focused on the process of implementing video capture and the principle and utility of video driver, this all made a basis for next job. In the second part of this paper, it covered the frame and flow of MPEG4 algorithm, and specially enhanced the modules which composed the algorithm. The last part, as the center of this paper, gave a detailed description of the obstacles encountered when transplanted and the methods used when optimization, and gave the comparison of every mothods that was been employed between the front and after condition of the optimization. Meanwhile, it demonstrated a performance-tesing summary that was arranged by the flow of optimization.After some optimization methods such as adjusting program structure and memory, pipeline technology, linear assembly, inline function and Image Library. After tset, it reflected a fact that the system completed a CIF format compression task of 15 frames per second compared with the previous 2 second per frame and basiclly satisfied video monitor system.