DOC《RM52J解码器实时优化实现》

RM52J解码器实时优化实现 赵首元1,张刚1,袁媛2*1.

51.51.51.5College of Information Engineering , Taiyuan University of Technology Taiyuan , Shanxi;

College of Information Engineering , Taiyuan University of Technology Taiyuan , Shanxi;

Taiyuan University of Technology Taiyuan , Shanxi太原理工大学信息工程学院,山西太原,030024;

太原理工大学信息工程学院,山西太原,030024;

太原理工大学030024;

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15698412998;

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18935155935;

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太原理工大学迎西校区信息工程学院3248信箱;

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shouyuan449894@163.com;

tyzhgang@tom.com;

shouyuan449894@163.com赵首元(1983―), 男, 在读硕士生, 主要从事视频压缩、流媒体通信的研究.张刚教授,博士生导师,主要从事语音、视频等方面的研究.;

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赵首元;

张刚;

袁媛ZhaoShouYuan;

ZhangGang;

YuanYuan赵首元 1.51.51.51.51.51.5 *|1|赵首元|ZhaoShouYuan|太原理工大学信息工程学院,山西太原,030024|College of Information Engineering , Taiyuan University of Technology Taiyuan , Shanxi|赵首元(1983―), 男, 在读硕士生, 主要从事视频压缩、流媒体通信的研究.张刚教授,博士生导师,主要从事语音、视频等方面的研究.|太原理工大学迎西校区信息工程学院3248信箱|030024|shouyuan449894@163.com|18935155935|15698412998|2|张刚|ZhangGang|太原理工大学信息工程学院,山西太原,030024|College of Information Engineering , Taiyuan University of Technology Taiyuan , Shanxi||||tyzhgang@tom.com|||3|袁媛|YuanYuan|太原理工大学|Taiyuan University of Technology Taiyuan , Shanxi||||shouyuan449894@163.com||RM52J解码器实时优化实现|RM52J decoder real-time optimal realized| (1. 太原理工大学信息工程学院,山西太原,030024;

2. 太原理工大学) 摘要:本文主要针对RM52J执行效率低下的情况,对其中的空间地址分配访问机制、像素插值块、主循环体结构几个部分提出几种关键的C代码级算法改进方案并给出解决过程,并对耗时模块中的反变换模块、环路滤波模块、分像素插值模块进行了多媒体指令集(MMX)优化,结果表明,经过算法改进和MMX优化在不影响信噪比的前提下大大提高了AVS格式视频图像解码效率,对PC机上AVS视频码流实时解码播放具有重要意义. 关键词: AVS;

RM52J;

解码器;

MMX;

中图分类号:TN919.81 RM52J decoder real-time optimal realized ZhaoShouYuan1, ZhangGang1, YuanYuan2 (1. College of Information Engineering , Taiyuan University of Technology Taiyuan , Shanxi;

2. Taiyuan University of Technology Taiyuan , Shanxi) Abstract: This paper made several key algorithm C code-level design and give the resolution process for several parts about address allocation of space and access mechanism、the pixel interpolation block and the main loop structure, and then made time-consuming modules optimized by the multimedia instruction (MMX) which include inverse transform module, the loop filter modules and sub-pixel interpolation module, for the low efficiency of RM52J. The results show that,the decoding efficiency of AVS format video image is greatly improved without affecting the signal to noise ratio after algorithm improving and MMX optimization, which is important for AVS video stream real-time decoding and playing on the PC. Key words: AVS;

RM52J;

decoder;

MMX 引言 AVS[1]作为中国具有自主知识产权的新一代音视频编解码标准,在高清数字视频及网络多媒体应用方面表现出很好的性能和低的复杂度.RM52J是AVS标准的参考软件,其特点是与标准一致,便于学习,但远远不能满足实时应用的要求.AVS编解码器要在互联网世界得到广泛应用,必须在PC机上针对AVS软件解码器进行速度优化. 本文所做工作,一方面在C代码级对参考软件进行了算法改进:改进了整个程序中内存空间的地址分配访问机制、C代码像素插值算法改进、残差系数全零块特殊处理、片头解码结构优化,循环体结构改进;