Design and implementation of a fully programmable MPEG-2 transport demultiplexer for an STB application on DM642
Ratna Reddy, Satish Arora · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2004
The DM642 is a next generation multimedia processor with a power full C64x DSP core and rich set of peripherals to meet the f requirements of various video applications. The STB is one of the widely used applications in audio-video broadcast arena. The MPEG-2 transport demultiplexer is the core front-end module in the STB application. An Optimized demultiplexer fully programmable architecture and a software implementation using DM642 is presented in this paper. This architecture fully utilizes the CPU power and the support available from the peripherals. The support includes PCR clock recovery, which is very critical for the entire STB application. The data flow and the control flow is tuned optimally in order to minimize the system overheads by reducing data bandwidth requirement and enhancing cache performance. This paper also describes techniques to parse the data efficiently by leveraging on 32-bit instructions and 64-bit load/store data access provided by the advanced C64x architecture. The benchmarks of the demultiplexer with a few typical transport streams are presented at the end.