應用於H.264/AVC的低功耗及低成本之CAVLC解碼器架構設計

Abstract

Context-based adaptive variable length coding (CAVLC) is a new and efficient entropy coding tool for the H.264/AVC. Although the CAVLC provides the excellent compression ratio, the computational complexity of the CAVLC decoder is higher than the traditional variable length decoder. This report proposes a low-power and low-cost architecture of the CAVLC decoder for the H.264/AVC baseline profile. The research derives the optimum power model for the variable length LUT of the CAVLC decoder, and then we merge the codeword length to reduce the hardware cost among the different LUT. Moreover, the design is based on the 0.18-μm TSMC CMOS technology. The experimental results show that the proposed decoder operates at the 125 MHz clock frequency with the hardware cost of 4412 gates. Furthermore, the proposed design can reduce the power consumption about 44% to 48% more than the previous low-power CAVLD schemes did.