Optimized implementation of multi-channel video encoder based on general DSP

This paper presents an embedded multi-channel video encoder using single-chip TI DM642 DSP. Not only could it process 4-way video signals real-time, but also it is full-function, high-reliability, small-size cubage, flexible control and low-power consumption. We construct encoder hardware platform by taking full advantage of DM642 DSP, video ports of DM642 can accept multi-channel video signals at the same time, and DSP handle video data parallel with the operation of data transferring using EDMA. By analyzing the hardware architecture and resource of DM642, we presents GMB coding scheme and efficient algorithm for DSP, namely fast motion estimation algorithm by calculating the best position in sub-pixel level, and DSP-based efficient quantization algorithm etc.