基于MPEG-2多协议封装的软解复用算法研究与实现

Research and Design of Demultiplex Algorithm Based on Multiple Protocol Encapsulation in MPEG-Ⅱ

高速数据广播传输国际标准是欧洲广播联盟以MPEG 2为核心制定的DVB标准,其中定义的多协议封装是最常用的一种广播方式。在高速数据广播系统中,MPEG 2协议的分析与处理是整个系统的关键,其算法效率决定了系统的数据处理能力。在深入研究DVB标准、MPEG 2多协议封装的基础上,提出了一种高效的MPEG 2多协议封装软解复用算法。该算法抛弃了通常的层次式协议处理,而采用直接解码方法,简化了协议解析步骤,并使用缓冲区阵列技术,提高了数据接收处理效率。基于此算法实现的数据广播接收卡驱动程序,经测试各项性能指标良好,目前已处于试用阶段。

As key part of Data Broadcasting Receiver,the efficiency of MPEGⅡ Demultiplex algorithm determined the performance of receive subsystem. On the Basis of thorough analysis of DVB standard and MPEGⅡ Multiple Protocol Encapsulation, this thesis has put forward a highefficient MPEGⅡ Demultiplex algorithm.According to this algorithm, the device driver of receiver has been implemented and put into use in Data Broadcasting System. This system has been tested by the State Administration of Radio,Film and TV and proved to be stable in operation.