Video Decoding Software Design Of 3G Server Based On DM642 Processor

With the arrival of the era of 3G, real-time video communication business expands constantly and the requirement for video codec performance is more and more urgent. In this paper, a video decoding software of 3G server is designed and implemented, with the DM642 processor as the develop platform.Chapter 1 introduces the background and significance of the topic. The relevant background including 3G networks, video coding international standards, error resilient for video decoding, OSD technology and the DSP processor. Then the purpose and the task of the software design are proposed.Chapter 2 introduces three video coding international standards which are the H.263 standard, the MPEG-4 standard and the H.264 standard. The chapter discusses the structures and related technologies of the video encoder and decoder of the three standards.Chapter 3 details the algorithm design of the video decoding software. Firstly, the error detection algorithm based on semantic is introduced. Then, an error detection algorithm using spatial correlation in compressed domain and pixel domain is designed to detect the content errors. Lastly, the chapter details the design and implementation of OSD algorithm.Chapter 4 introduces the decoding software running platform TMS320DM642 processor. Then the chapter details the optimizations of the video decoding software, including C code optimization, linear assembly optimization and data flow optimization.Chapter 5 summarizes the design of the video decoding software of 3G server and describes the perspective of the further perfection of the software.