基于DSP平台H.264编码器的实现与优化  

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

作　　者：张石[1] 矫田广[1] 刘晓志[1] 

机构地区：[1]东北大学,辽宁沈阳110004

出　　处：《现代电子技术》2008年第19期126-130,共5页Modern Electronics Technique

摘　　要：相对于以前其他的标准,H.264标准在分层编码、帧内/帧间预测编码、多帧参考、预测精度等技术方面做了巨大的改进。因此,在TMS320DM642平台上实现H.264基档次编码器的移植与优化显得格外实用和必要。基于对DSP平台的结构特性和H.264的计算复杂度分析,主要从以下3个方面对H.264编码器进行了优化:核心算法、数据传输和存储器/Cache使用。实验结果表明,对于CIF格式的视频序列,最优化后的H.264编码器能够达到每秒高于24帧的编码速度,满足了视频处理对于实时性的要求。Compared with other previous standards, H. 264 standard has great improvement in aspects of hierarchical encoding,intra/inter prediction coding, multi - frame reference and prediction accuracy. It ＇s practical and necessary that the optimization and implementation of H. 264 baseline profile encoder on the platform of TMS320DM642. Based on the architectural features of DSP and the computational complexity analysis of H. 264 encoder, the H. 264 encoder is optimized from the following three aspects：core algorithms, data transfer and memory/Cache use. The experimental results demonstrate that the optimized H. 264 encoder can achieve the encoding speed of more than 24 frames/s for the video sequences with CIF format,which can meet the real - time requirements of the applications.

关 键 词：预测精度 H.264编码器 最优化 TMS320DM642 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]