基于MMX技术的H.264编码器的研究与实现

Research and implementation of H.264 coder based on MMX technology

分析甚低码率视频压缩标准H.264的算法特点,基于H.264软件编码器,根据MMX技术的特点、数据结构和使用方法,用支持单指令多数据SIMD的MMX技术优化H.264的算法模块。重点讨论最耗时的DCTI、DCTI、TI、IT、帧间预测、帧内预测的运动估计、补偿模块的MMX实现算法。实验结果表明:优化后的编码器的处理速度提高到原来的1.3倍,有一定的实用价值。

First, based on H.264 software coder and the MMX instruction set, key algorithm modules of H.264 by analyzing the characteristic of very low rate video coding standard H.264 via MMX technology. Then, the most time-consuming modules such as DCT, IDCT, IT, IIT and the intra/inter motion prediction/compensation are mainly discussed. Finally, testified with experiment, the software coder is prominent while 1.3 times calculation speed is achieved after optimization.