基于S3C2410的WMA开源解码程序优化.pdf

13 计算机工程与设计ComputerEngineeringandDesign2009。30(1) ·嵌入式系统· 张海滨， 李挥 (北京大学深圳研究生院集成微系统科学工程与应用重点实验室，广东深圳518055) 运算转定点运算、以空间换时间以及手工汇编3种优化方案。详细介绍了定点化原理，并提出了模块化的优化方式，对 著提高，已经能够流畅播放单通道的WMA文件。 关键词：嵌入式系统；浮点转定点；MPlayer；WMA解码优化；$3C2410 中图法分类号：TP311．54文献标识码：A 文章编号：1000-7024(2009)01．0013．03 source ofWMAbased 1 Optimizingopen decodingprogram on$3C240 ZHANGHai．bin．LIHui of Scienceand Graduate (KeyLaboratoryIntegratedMicrosystemEngineering School， Applications，Shenzhen 51 PekingUniversity,Shenzhen8055，China) Abstraet：Forthe oflOW of Media witllin WMA(Windows of problemefficiency Audio)decoder,whichMPlayer,011也eplatform charactersof$3C2410are $3C2410．Threeoptimizingmethodsaccordingtothe analyzed．Themethodsinclude numbertofixed tosavetimeand assemble of floatnumber pointnumber,usingspace using language．Moreover,the principlefixing isintroducedindetails．Thenmodularmethodfor ofWMAis showsgreat optimizingdecodingprogram proposed．Eventually,it in ofWMAdecoder011$3C2410 itcardecodechannelWMAfilewith progressefficiency throughcomparativeexperiment．And single fluency． great words：embeddednumbertofⅨed WMA 0 Key system；float number；mplaycr；optimizingdecoder；$3C241