Optimization and Implementation of H.264 Encoder Based on DSP Platform

Abstract

Abstract Aiming at the problem of low precision and long running time of traditional H.264 encoder algorithm, this paper proposes two optimization methods. One is to propose a method suitable for DSP to carry the reference frame, which can reduce the waiting time of DSP operation unit. By using DMA to read the data stored in the external access device in advance, all the data involved in the operation are stored in the memory of DSP chip. This improves the operation efficiency of DSP. Second, the macroblock based loop filtering makes the access times of DSP external memory minimum, and enhances the DSP’s ability of processing data. The test results show that the average decoding speed of the decoder is increased by 60% by the two optimization methods. The test system can decode CIF image at 526 MHz, and the speed can reach 30 frames per second.