基于High Profile H．264的CABAC解码器的优化

CABAC Decoder Optimization Based on High Profile H. 264

与CAVLC相比，CABAC的比特率提高了大约9％～14％，但是计算量大且计算复杂度较高，为了解决这个问题，本文从实现结构上对CABAC进行了优化，增加了上下文建模的缓冲器，并将解码引擎进行级联，充分利用CABAC优点的前提下，降低了计算复杂度，同时也减少了计算量。通过VCS仿真得出，CABAC解码器在200MHz频率的前提下的等效通过率为95Mb／s，完全满足高清视频各种码流的要求，能实时解码。

Comapared with CAVLC, the bit rate of CABAC is increased by about 9% - 14%. However CABAC requires a large mount of computation and the processe is complicated in decoding. In order to solve this prob- lem,this article attempts to make full use of the advantages of CABAC through effective implementation of con- text modeling of the buffer,upgrading of decode engine, and to reduce the computational complexity and the a- mount of computation at the same time. In conclusion the VCS simulation results show that the CABAC decoder in 200M frequency （under the premise of the equivalent passage rate of 95mbps） will fully meet the various re- quirements of high-definition video stream real-time decoding.