EFFECTIVE DECODING METHOD OF H.264/AVC CONTEXT-BASED ADAPTIVE VARIABLE LENGTH CODING

摘要

A CAVLC(Context-based Adaptive Variable Length Coding) decoding method is provided to minimize the memory access by a table look-up and reducing the decoding time and the power consumption, by classifying VLC codes into groups according to correlation thereof, defining an arithmetic equation for each of the groups, and performing a decoding process according to the arithmetic equation. A Coeff_Token is decoded, wherein the Coeff_Token consists of a combination of a TotalCoeffs value(TC) and TrailingOnes value(T1s). A run_before is decoded, wherein the run_before is the number of zeros before each of non-zero coefficients. A total_zeros is decoded, wherein the total_zeros is the number of coefficients each having a value of the zero before the last non-zero coefficient. Each of Coeff_Token decoding, run_before decoding, and total_zeros decoding comprises sorting and classifying VLC codes according to a predetermined criterion to form groups, assigning an arithmetic equation for decoding to each of the groups, and performing the decoding according to the arithmetic equation.