An efficient implementation for H.264 decoder

The computational complexity of H.264 video coding standard is two or three times higher than that of H.263 and MPEG-4. Especially, the operations of the entropy coding and deblocking filter are the most complex parts in the decoder. In order to reduce the computational complexity of these operations, we propose a fast algorithm for H.264 decoder implementation, which containing a group-based CAVLC decoding method for H.264 entropy code-tables and an optimized pre-judging Bs method for H.264 deblocking filter to reduce the computational complexity. The computer simulation results indicate that the entropy decode algorithm can decrease 82.3%~87.9% decoding time than the original H.264 reference software and the improved deblocking filter algorithm can decrease 69.4%~76.9% computing time compared to the original H.264 reference software.