嵌入式MP3解码研究与优化  

STUDYING AND OPTIMIZING MP3 DECODING ON EMBEDDED SYSTEM

作　　者：张波[1] 戎蒙恬[1] 王澄[1] 刘文江[1] 

机构地区：[1]上海交通大学电子工程系,上海200240

出　　处：《计算机应用与软件》2009年第12期56-59,共4页Computer Applications and Software

基　　金：国家自然科学基金项目(60521002);上海-应用材料研究与发展基金(06SA09)

摘　　要：分析MP3解码库的解码流程和数据流向,并基于此分析提出了以加快关键数据读写速度的方法对现有MP3解码进行优化。根据紧密耦合内存TCM(Tightly-coupled Memory)被集成片内,具有与高速缓存相同的读写速度的特点,将TCM应用于解码过程,使得解码过程中利用频率最高的数据的读写速度得到提升,减少CPU等待数据的时间,实现了嵌入式系统解码性能的提高。In this paper it analyzes the decoding process and data flow in MP3 decoding library, and gives the method for optimizing existing MP3 decoding by speeding up the key data reading and writing based on above analysis. According to the character of tightly-coupled memory （TCM） which is integrated in chip and has high speed in reading and writing as fast as the cache, we apply TCM to MP3 decoding process by utilizing the data reading with highest usage frequency during the process so as to increase the writing speed and to decrease the data waiting time of CPU. Finally we have achieved the goal of enhancing the decoding performance on embedded system.

关 键 词：MP3解码 关键数据 紧密耦合内存 

分 类 号：TP316[自动化与计算机技术—计算机软件与理论] TN912.3[自动化与计算机技术—计算机科学与技术]