Software Design Of Multi-channel H.264 Encoder Based On DM6467 Processor

With the improvement of people's safety awareness, the video surveillance has experienced considerable development. As the latest generation of video codec standard, H.264 has greatly improved compression efficiency compared to the past standards. However, the multi-channel real-time encoding of H.264 is one of the difficulties of video surveillance industry because of its high computational complexity. In this thesis, a multi-channel H.264 encoder software is designed based on TMS320DM6467 DSP processor.In Chapter 1, the video surveillance system, video codec standards and digital signal processors are introduced.In Chapter 2, the basic principles and framework of the H.264 standard are introduced. Then, the structure and core technologies of the H.264 encoder and decoder are highlighted.In Chapter 3, brief introduction of hardware structure and composition of DM6467 processor are given. The software development platform CCS is also described.In Chapter 4, the research and development of multi-channel H.264 encoder software are presented. The interface design, process control, parallel encoding pipeline and data flow design are included in the entire design process.In Chapter 5,the H.264 encoder software is optimized by three technologies: compiler options configuration, data flow optimization, and the load balancing between C64X+ DSP core and ARM968 core. The experimental results show that the efficiency has been improved by 23%,4 channel D1 and 4 channel CIF H.264 encoder running at 25fps can be realized on TMS320DM6467 processor. Moreover, the degradation of PSNR compared to JM is between 0.1 dB and 0.8dB, which means that the encoder still has good video quality.In Chapter 6, a summary of the design and optimization process is concluded and the prospects of the future work are given.