面向龙芯平台的快速DCT算法及其实现  

Loongson Platform Oriented Fast DCT Algorithm and Its Implementation

作　　者：王明[1] 彭成磊[1] 都思丹[1] 

机构地区：[1]南京大学电子科学与工程系,南京210093

出　　处：《计算机工程》2009年第17期223-225,228,共4页Computer Engineering

基　　金：国家"863"计划基金资助项目(2006AA010201)

摘　　要：针对龙芯2E平台不能流畅播放视频文件的问题,对视频变换过程进行优化,采用一种新的离散余弦变换(DCT)算法,基于龙芯2E多媒体指令集对其进行实现,用该算法替代FFmpeg软件中的DCT算法。测试结果表明,新的DCT算法性能比传统DCT算法提高近11倍,优化后的FFmpeg软件编码速度提高10%左右。Aiming at the problem that video files can not be played fluently on the Loongson 2E platform, this paper optimises the video transform process and uses a new Discrete Cosine Transform（DCT） algorithm. This algorithm is realized based on multimedia instruction set ofLoongson 2E platform and used to alternate the DCT algorithm in FFmpeg software. Text results show that the performance of new DCT algorithm is nearly 11 times higher than the traditional one, and the coding rate of optimised FFmpeg software increases nearly by 10%.

关 键 词：离散余弦变换算法 龙芯2E多媒体指令集 FFmpeg软件 

分 类 号：TP51[自动化与计算机技术]