【作者】 卢国勋；

【导师】 孙军；

【作者基本信息】 上海交通大学 ， 通信与信息系统， 2007， 硕士

【摘要】 目前,IPTV有MPEG-2 TS和ISMA两种主流传输形式。ISMA是为Internet上的流媒体服务而制定的标准,特点是封装协议带来的开销小。ISMA起步较晚,行业认同度还比较低。TS是数字电视广播行业通用的标准,支持多种基本媒体流和多种媒体编码标准。TS流封装已经得到全球广播行业的认可和广泛应用。因此, MPEG-2 TS处理技术的研究对IPTV传输系统具有重要的理论价值和现实意义。Internet网络带宽是十分宝贵的,所以在Internet上开展IPTV传送的不是整个MPTS,而是用户要看的一路节目,这就要求将MPTS解复用/再复用成SPTS,同时,IPTV的分析监测将广泛应用于IPTV系统中的各个环节,本文正是针对IPTV的这种需求,基于DM642对MPEG-2 TS流解复用/再复用、IPTV MPEG-2 TS流分析相关技术进行了研究。本文首先介绍了IPTV的发展现状和前景,然后对MPEG-2系统标准、TS、PSI的结构和语法进行了详细阐述,并且对从事本课题研究的平台进行了介绍。在解复用/再复用设计中,本文针对解复用/再复用的一些关键点了详细阐述了TS流的输入/输出、分析和监控、包调度、交互数据插入以及PCR校正的具体实现。其中,在TS流输入/输出设计部分详细分析了DM642内部输入管道帧的个数以及Video Port的EDMA阈值对系统性能的影响;在充分考虑TS流的内在特性的基础上,在包调度器设计部分提出了按照视频包、空包、音频包的次序对TS包进行调度的策略;在总结以往PCR校正算法的基础上,提出了一种新的基于DM642的软件实现方法。本文最后一章给出了一种IPTV MPEG-2 TS流分析的实现方案,并对DM642视频口的8bit RAW输出模式进行了研究,实现了8bit RAW模式下的TS流输出。更多还原

【Abstract】 Currently, For IPTV service, there are two kinds of packaging form: one is ISMA, which is enacted for streaming media service for the Internet, its packaging protocol takes little bandwith, but it starts late and still relatively gets low degree of recognition in the industry. The other is MPEG-2 TS, which is a common industry standard, it supports a variety of multi-media streaming and coding standards. TS package has been approved and widely used in the global broadcasting industry. Therefore, the research on the MPEG-2 TS processing Technology will be a theoretical and practical significance for the transmission system of IPTV. Internet bandwidth is very precious. So, for IPTV service, instead of transmitting the entire MPTS, it only transmits the SPTS the user requested, which calls for demultiplexing the MPTS and re-multiplexing it into SPTS. Meanwhile, the analysis IPTV MPEG-2 TS will be widely used in all aspects of IPTV system. This paper will meet the needs of IPTV and do some research on the correlation technology of the de & re-multiplexing of MPEG-2 TS and the analysis of MPEG-2 TS based on DM642.This paper firstly introduces the current state and prospects of the development of IPTV, then gives a detailed description of the structure and grammar of MPEG-2 system standard, TS and PSI, and engaged in the introduction of the research platform of this paper. For de & re-multiplexing of MPEG-2 TS part, this paper describles some detailed implementation of the key points such as TS input and output, analysis and monitoring, packet scheduling, interactive data insertion and PCR correction . The part of the TS input-output design gives a detailed analysis of the impact of the DM642 internal frame number of the input channels and Video Port EDMA threshold on system performance; The package scheduling part fully considers the intrinsic characteristics of TS, and presents an packet更多还原