一种新型的AVS熵解码码表结构

传统AVS熵解码过程中需要存储大量的码表数据,并且在码表查询和切换的过程中存在很多的判断和跳转指令,严重地降低了解码速度,不利于DSP的实现。为了实现嵌入式AVS视频解码器,通过分析熵解码码表的特点,提出了一种新型的码表结构和一种分组查询的查询方法,代码实现采用DSP汇编语言。结果表明,与传统的码表结构和查询方式相比较,大大节省了数据空间,缩短了代码的执行时间,提高了解码的效率。

A Novel Code Table Architecture of AVS Entropy Decoding

There is a need to store large amounts of code table data in traditional AVS entropy decoding and a large quantity of judgment and jump instructions exist in the process of code table query and switching, severely reducing the decoding speed and adverse to DSP implementation. To achieve the embedded AVS video decoder, a new code table structure and the query method of querying by group are proposed by analyzing the characteristics of entropy decoding code table; and the code is implemented with DSP assembly language. The results indicate, compared with the conventional code table structure and query method, that the data space is saved dramatically, the code execution time is reduced and the decoding efficiency is improved.