基于嵌入式ARM的音频WMA定点优化  

Integer Optimization of WMA Audio Based on Embedded ARM Environment

作　　者：苏扬[1] 胡绍江[1] 郭倩[1] 

机构地区：[1]武汉理工大学信息工程学院,武汉430070

出　　处：《武汉理工大学学报》2009年第19期137-140,共4页Journal of Wuhan University of Technology

摘　　要：为提升ARM上WMA解码性能,基于FFMPEG工程的解码算法,简要地介绍了浮点转定点、快速除法处理、汇编化、特殊函数算法优化等4个优化方面,重点描述了浮点存储格式及浮点数转定点数的方法,此优化的结果使WMA的解码速度获得大幅度提高,并在I.MX21(ARM926内核)平台上得到验证。For the better performance of WMA decoding on ARM Environment, four optimizations of WMA decoding based on FFMPEG, including principle of Float-point to Integer-point, Express division, Assemble and Algorithm of special functions optimization are introduced. It focuses on the description of the conversion between Float-point and Integer-point. The decoding had a good performance with the help of optimizations, and the result was verified on I. MX21 （ARM926 Core） platform.

关 键 词：WMA IEEE754标准 ARM926 MDCT 汇编指令 FFMPEG 

分 类 号：TP311.1[自动化与计算机技术—计算机软件与理论] TP37[自动化与计算机技术—计算机科学与技术]