【作者】 谭晶；

【导师】 陆永忠；

【作者基本信息】 华中科技大学 ， 软件工程， 2004， 硕士

【摘要】 在对运动图象专家组标准-2(Moving Picture Expert Group-2,MPEG-2)传输流的介绍和对分组语法详细说明的基础上,将数字电视视频码流中各种有用的数据负载从标准的MPEG-2传输流中分离出来。通过对程序特殊信息(Program Special Information,PSI)的分析,包括程序关联表(Program Association Table,PAT)、程序映射表(Program Map Table,PMT)、条件访问表(Conditional Access Table,CAT)等语法结构,给出了解析PSI信息的一个具体方法。在对数据视频广播(Digital Video Broadcasting,DVB)业务信息(Specification Information,SI)信息表的语法结构详细说明的前提下,包括网络信息表(Network Information Table,NIT)、业务描述表(Service Descriptor Table,SDT)、节目组相关表(Bouquet Association Table,BAT)、事件信息表(Event Information Table,EIT)等大量的语法结构,实现了对这些语法结构的解析。对在整个DVB-SI信息系统中大量使用的描述子做了细致的分析,并提出了解析描述子的一种相对优化的算法。依靠对MPEG-2流和PSI/SI信息的分析,设计并实现了一套视频监视系统,严格按照MPEG-2及欧洲DVB标准对输入码流进行分析。采用模块化的设计,使模块更易复用。以数据驱动作为系统的整体数据流向,由接收模块接收到指定的数据后,将数据添加进相应的通道,由通道通知主模块数据到达,使得整个系统结构顺畅,并拥有较高的数据处理效率。系统中设计了一个可复用的过滤器,对数字业务平台中传输的各个程序号(Program Identification,PID)的传输流(Transport Stream,TS)进行接收和分发,凭借一个高效队列缓存区,成功的对程序原始流(Program Elemental Stream,PES)进行播放。另外,实现了对数字电视码流中各节目的流量和各种记录值进行统计,对ETSI(European Telecommunication Standard Institute) TR(Technical Report)290中所规定的三层错误及MPEG TS中的多种错误进行分析记录,对传输流中节目的异常发出报警信息,并且能够对运行时间内发生的事件和消息进行记录,形成可以维护的各种日常参数。更多还原

【Abstract】 Based on the introduction of MPEG-2(Moving Picture Expert Group) transport stream and packet stream syntax, various kinds of useful digital TV data are separated from the standard MPEG-2 transport stream. With analysis of the PSI(Program Specification Information),including PAT(Program Association Table),PMT(Program Map Table) and CAT(Conditional Access Table),an effective method of parsing PSI is put forward. Through the specification of the DVB (Digital Video Broadcasting) SI (Specification Information), including NIT (Network Information Table), SDT (Service Descriptor Table) and BAT (Bouquet Association Table), the SI and various kinds of descriptors are parsed in the thesis.According to the above discussion about MPEG-2 transport stream and PSI/SI, This paper proposes a front monitoring system, strictly complying with MPEG-2 and DVB standards. To make the module easier to reuse, module design method is adopted. Urge the whole system depending on the receive data, receiving module get the data, and add the data into the channel, channel notify the main module. In the system, a filter is designed to parse and dispose the various digital video data, and a queue buffer is designed to play the program elementary stream. The program flux value and various statistics and the errors defined in ETSI (European Telecommunication Standard Institute) TR (Technical Report) 290 are recorded. Exception in transport stream can be alarmed. The event and message in the system running period can be recorded on a log that can be maintained.更多还原