基于H.264的多视点立体视频解码器优化算法研究*

与平面(单视点)视频相比,多视点立体视频的数据量成倍地增加,对解码速度以及播放的流畅性影响很大,成为限制其广泛应用的重要因素之一。为了提高多视点立体视频的解码速度,基于H.264/MVC标准,根据码字前缀的特点,将原有码表划分为若干区域,精确了查表范围,优化了熵解码中CAVLC的查表过程,并将优化后的解码器移植到播放器中。实验结果表明,提出的优化算法使查表部分的速度提高70%左右,整体解码时间提高了5.9%。最终达到了一定的解码优化效果,并实现了播放器对264格式8视点立体视频文件的解码及播放功能。

Optimization algorithm research of multi-view stereo video decoder based on H.264

Compared with plane video,the data of multi-view stereo videos increase manyfold,which has a great impact on decoding speed and the fluency of playing.It becomes a main reason for the limitation of their widespread.To improve the speed of decoding multi-view stereo videos based on H.264/MVC,this paper divided the original code table into several regions according to the characteristics of prefix code word,optimized the table look-up process of CAVLC entropy decoding,and transplanted the optimized decoder to the player.Experimental results show that the proposed algorithm narrows the table look-up scope,improves the table look-up speed by about 70% and the overall decoding speed by 5.9%.Ultimately,this paper achieved certain effect of decoding optimization and the decoding and playing functions of 8-view stereo videos in 264 format.