摘要
为提高H.264编码速度,在DM642上对x264源代码进行汇编语言改写优化.其中DCT变换和帧内预测选择进行线性汇编优化,SAD函数进行并行汇编优化.对原代码和改写后的代码对其运行时钟周期进行测试,实验结果表明以上操作减少了代码执行所需的时钟周期,提高了编码器性能.
To increase the encoding speed of H. 264,an optmization method is proposed for improving the run effectiveness of source code x264 on the platform of DM642. Thereinto, DCT（ discrete cosine transform） and frame predition are optimized by using linear assembly optmization method. While the SAD function is optimized by using parallel optmization one. Experimental tests are then implemented for evaluating the running speed of the origi-nal source code as well as that of the optimized code, and the experimental results show that optimazation of the source code x264 for the platform of DM642 significantly decreases the running clock cycle and thus improves the performance of the encoder.
出处
《南华大学学报（自然科学版）》
2014年第1期74-76,87,共4页
Journal of University of South China：Science and Technology
基金
2010年湖南省高等学校科学研究基金资助项目(10C1145)
关键词
H
264
X264
DM642
线性汇编
并行汇编
h. 264
x264
DM642
Linear assembly optmization
parallel assembly optmization
