【作者】 覃妮；

【导师】 李宇成；

【作者基本信息】 北方工业大学 ， 检测技术及自动化装置， 2009， 硕士

【摘要】 视频通信系统一直是通信应用研究的热点方向之一。目前,H.264视频压缩标准凭借其高压缩比和图像的质量,作为一种新型的标准被广泛的接受并应用到视频通信系统中。但H.264的优越性能是以其复杂度的成倍增加为代价换取的,所以一般的处理平台已不能满足H.264高计算复杂度的需要。TI公司生产的C64系列芯片具有很强的并行处理能力和信号处理功能,是实现H.264编解码的理想平台。随着嵌入式技术的不断发展,基于嵌入式系统平台的设计网络接口实现实时网络视频传输已成为嵌入式视频通信系统开发过程中的重要环节之一。本文对H.264视频压缩标准做了比较详尽的分析,并对H.264标准参考模型jm86在闻亭公司的DM642处理平台上的具体实现方法和优化的过程进行了阐述。主要介绍了微操作系统DSP/BIOS的应用和开发。通过DSP/BIOS操作系统我们可以实现多任务操作处理。此外还较为详细的介绍了RF5参考框架的原理,在其基础上开发多算法、多数据通道的标准化程序具有较大的意义。随后作者对DSP6000系列的网络驱动开发包进行了细致的分析。并应用NDK中的socketAPI和DSP/BIOS实现了基于VDPDM642平台网络视频中的网络驱动。最后作者将H264的解码程序和网络驱动部分结合起来形成了一个简单的终端,实现了网络解码的功能。实验表明,在VDPDM642上实现H.264的网络解码,具有较好的执行效率。解码速度从改动前的1帧/4秒提高到了8帧/秒,速度提高了几十倍,取得了较好的优化效果。更多还原

【Abstract】 The video communication technology is one of most important Applied Research Communications ways .At present, H.264 video compression standard is widely accepted and applied to the video communication system as a new type of standards with its perfect compression ratio and image quality. But, the superior performance of H.264 is base on that its complexity is more than others, so normal processing platform can’t meet the complexity of H.264. C64 chip series produced by TI is the H.264 codec ideal platform, has a strong ability to processing and signal processing functions, With the development of embedded technology, embedded system platforms based on the design of network interface which achieve real-time network video transmission has become one of most important aspect of the embedded video communication system developed in the course of produce.In this paper, we have done a more detailed analysis on the H.264 video compression standard , talk about the process of specific implementation and optimization on the H.264 standard reference model in jm86 Wintech’s DM642 processing platform . and introduced the applications and development of a micro-operating system, DSP / BIOS. Through using the DSP / BIOS operating system, we can deal with the realization of multi-tasking operation. In addition, the pater also detailly introducs the principle of reference frame of RF5,and debelops the multi-algorithm , the multi-data channels standardized procedure in its foundation to Have the big significance.Then the author make detailed analysis on the DSP6000 Series Network Driver Development Kit. And Implement the video network driver base on VDPDM642 platform by using socket API and DSP / BIOS of NDK. Finally, the author combine H.264 decoding and network drives to form a simple terminal, and realize the functions of the network. And the test indicates that H.264 dencoding system can be implemented on VDPDM642 chip with a better performance.更多还原