Bandwidth-efficient adaptive cache-like buffer architecture in motion compensation for general video codec

Abstract

In this paper, we propose the cache-like hardware architecture of motion compensation for general hybrid video codec. The proposed architecture exploits dynamic cache-like buffer structure. Typically, every macroblock unit (MBU) fetches a constant amount of reference data from the external video memory for cache update. However, when the updated data is centered at a fixed position, e.g. considering a zero motion, hit ratio of the cache buffer updates tends to be abruptly dropped. To cope with this problem, an adaptive cache-like buffer shift algorithm was used. From our experimental results, it was demonstrated that the proposed algorithm successfully increased up to the maximum 15 % in cache hit ratio and raised the lowest bound of hit ratio to 85 %.