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。

关键词: 离散余弦变换算法, 龙芯2E多媒体指令集, FFmpeg软件

Abstract: 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 of Loongson 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%.

Key words: Discrete Cosine Transform(DCT) algorithm, Loongson 2E multimedia instruction set, FFmpeg software

中图分类号: 

• TP51