Research and Implementation of a Low Hardware Cost CABAC Encoder

Context-Based Adaptive Binary Arithmetic Coding(CABAC)is one of the most important innovative techniques in H.264/AVC.By combining arithmetic encoding and adaptive context-model it can get a high compression ratio,it can enhance 9%～14% data compression efficiency campared to CAVLC.As one the newest entropy encoding methods,it combines adaptive techniques、context models and binary arithmetic encoding,and so it uses non-multiplication and an easy probability estimation method,these techniques made it more easier to complete the encoder by hardware.This paper proposes a design achieving the requirement of real-time 1080P(@30Hz) encoding.An ASIC implementation of the design is realized by SMIC 0.18μm standard cell library.The estimated frequency is 200MHz,the area is about 9700gates,and the CABAC encoder could be used in video coding.