Based On DM642 MPEG-4 Video Server's Design And Optimization

The project's original intention was to project the development of independent intellectual property rights of a video surveillance system to meet the various needs of the rapidly development, such as security, network video conferencing, intelligent transport, remote video surveillance, intelligent buildings, and other works . The system is based on TI's programmable launched a high-performance digital signal processor TMS320DM642 DSP. On this basis, designed and developed a set of standards-based MPEG-4 video services, using TMSDM642DSP hardware platform to realize the MPEG-4 video encoder and optimize them to achieve real-time requirements.The international Motion Picture Experts Groups (MPEG) formally brought forward the new MPEG-4 Standard in 1999. MPEG-4 firstly introduced the concept of video object and contained object-based coding and model-based coding, and then supported content-based interactive and object-based scalable encoding. The standard paid mostly attention to interaction and flexibility in multimedia communication compared with former international standard of video compression, it is different from those old standards.So it provides a broader platform to multimedia data Compression.Papers firstly introduced the image coding technology and the development of principles, focused on MPEG-4 encoding technology in the framework structure and technical characteristics, and compared its core coding algorithm to determine the coding scheme for MPEG-4 simple framework (SP Simple Profile) under the VOP (Video Object Plane) Coding. We study the hardware architecture of DM642, instruction system, memory architecture of DM642, pipeline and software explored flow. This paper take depth discussions on the design of hardware platform development and optimization. We concluded three optimization process under theC64Xplatform:1, algorithm optimization.Efficient use of algorithms to improve Module efficiency;2, procedures optimization. Reasonable procedures processes, improve utilization of DSP memory.3, compilation optimization.Rewritten the multiple calls and recycling-based function for the compilation language,and optimized it by the compilation Optimizer.The result of the experiment shows that the optimized video system can transfer the video source at QCIF format with a speed of 25fps.