【作者】 汪康；

【导师】 刘金刚； 郑晓军；

【作者基本信息】 首都师范大学 ， 计算机应用技术， 2006， 硕士

【摘要】 随着信息技术的发展，人们对多媒体通信的需求有了显著增长。为了在通信中高效地存储和传输视频数据，必须要使用视频压缩技术。第二代视频压缩标准进一步提高了视频编码压缩的效率，成为当今工业界和学术界研究的热点，其中主要的几个标准包括H.264，AVS以及VC-1。作为AVS的移动视频部分，AVS1-P7的复杂度比现有的标准高出数倍，这就使得在硬件资源相当有限的手持通信设备上实现基于AVS1-P7的应用变得非常困难。本文提出了一种基于TI OMAP平台(德州仪器公司的开放式多媒体应用平台)的AVS1-P7解码器的实现方案。 本文首先对AVS1-P7视频标准的关键算法及复杂度进行了分析，对其中的反变换、运动补偿等核心算法提出了相应的优化方案，同时在代码的实现上提出了进一步的优化措施。然后结合OMAP的特点讨论了在其上设计软件的思想。OMAP5912是一款由ARM9和C55x DSP构成的双核芯片。为了高效利用其双核的性能，ARM端程序被设计成负责提供与用户交互的接口和控制DSP进行数据处理；而DSP端程序则实现具体的解码功能。最后，本文给出了该设计在OMAP5912平台上的仿真结果和讨论，并且对AVS1-P7标准的产业化发展进行了展望。更多还原

【Abstract】 With the development of information technology, there is a growing demand for mobile multimedia communication. In order to store and transmit video data efficiently, it is necessary to develop techniques for compressing these video data. With high compressing efficiency, the second generation compressing standards including H.264, AVS and VC-1 become the research focus nowadays. However, complexity of the AVS1-P7 codec, the mobile video part of the AVS, is several times higher than that of existing standards. So it is difficult to implement multimedia application based on AVS1-P7 for handled devices due to limited hardware resource and great complexity. This thesis describes the implementation of AVS1-P7 video decoding on TI OMAP (Open Multimedia Applications Platform).In this thesis, the key arithmetic and complexity of AVS1-P7 decoder is analyzed first. Optimization methods in inverse transform, motion compensation and other parts of decoder are proposed, also including the code realization. Then, discussion about designing software on OMAP is provided together with the features of OMAP. OMAP5912 consists of an ARM9 core and a TI C55x DSP. To utilize OMAP dual-core architecture efficiently, the program on ARM is designed to provide a user interface and control DSP, and the decoding job is performed on DSP. At last, Simulation results are showed and discussed. Also we have a prospect of industrialization of AVS 1-P7.更多还原