文档介绍：华中科技大学
硕士学位论文
XVID视频解码器的DSP优化设计与实现研究
姓名:李乔亮
申请学位级别:硕士
专业:模式识别与智能系统
指导教师:汪国有
20050512
摘要
随着多媒体编码技术的发展视频压缩标准已在很多领域得到了成功应用如 VCD
MPEG-1 视频会议 DVD MPEG-2 和机顶盒 MPEG-2 等等网
络带宽的不断提升和高效视频压缩技术的进步为流式媒体的发展铺平了道路使得
人们逐渐把关注的焦点转移到了宽带网络数字电视 IPTV 流媒体等基于传输的业
务上来因此高效的视频压缩标准是流媒体技术发展的关键
MPEG-4是以视听媒体对象为基本单元实现数字视音频和图形合成应用交互式
多媒体集成的第二代视音频压缩标准本文将深入研究MPEG-4视频编解码原理以及
DSP实现优化等技术问题以推动多媒体编解码技术的应用
XVID被认为是目前最快的遵循MPEG-4标准的视频编解码器具有压缩效率高
变码率范围宽等特点本文首先详细介绍XVID解码部分的算法模块流程和接口然
后针对ADI Blackfin 533平台分析和研究DSP汇编程序移植和优化技术具体包括堆
栈设计兼容性设计和汇编程序设计为了进一步提高解码性能在功能验证的基础
上对解码器在指令级系统级和输入输出上进行优化设计经过优化设计 XVID 视
频解码器在保证30-80倍高压缩比的前提下对CIF格式图象序列的解码速度从优化前
的15-60fps攀升到40-120fps
最后本文在BF533平台下选用了具有不同运动特征的MPEG-4压缩流为码流源
进行了多组实验实验结果证实了本文研制的XVID视频解码器的正确性有效性和互
操作性

关键词 XVID DSP 堆栈汇编优化

IV
ABSTRACT
With the development of the multimedia coding techniques, pression
standards have already been essful applied in many fields, such as VCD (MPEG-1),
video conference (), DVD (MPEG-2), Set-top Box (MPEG-2) etc. Due to the boost of
network bandwidth and the development of high efficient pression techniques,
much attention has been paid on work digital TV (IPTV) and the streamed multimedia,
which are transfer oriented. The boost work bandwidth promotes the development of
streamed multimedia, while the emergence of high efficient pression standards is
the key of the development of the streamed multimedia techniques.
MPEG-4 is pression standard based on the second generation video and audio
coding techniques, whose elementary units are video and audio objects. It implements not
only the application of digital video, audio pound graphics, but also the integration
of interactive multimedia. At present, it has been widely used in the field like streamed
multimedia service.
It is believed that XVID is presently the fastest video decoder which follows the
MPEG-4 standard. It mainly implements the Simple Profile of the standard. In this thesis a
detailed introdu