【作者】 陈中亮；

【导师】 侯媛彬；

【作者基本信息】 西安科技学院 ， 计算机应用技术， 2002， 硕士

【摘要】 本文主要对IP组播路由选择算法和组播技术在网络多媒体中的应用进行了研究。 首先，本文对组播技术的基础理论，包括组播路由选择算法、组播路由协议和互联网组管理协议等进行了综述，在此基础上，提出了一种新的组播路由选择算法，它适用于只有一个组播源的组播网络。此组播路由选择算法与单播路由协议无关，它要求接收方在加入组播组时使用TCP连接直接向组播源发送加入组播组请求消息，组播源收到请求消息后向接收方发送请求确认消息，沿途的路由器则根据确认消息建立组播路由信息。 接着，本文对实时传输协议(RTP)的原理和微软公司的DirectShow技术作了介绍。使用RTP协议，借助于DirectShow的框架，在应用研究中建立了两个用于发送和接收组播媒体流的过滤器(Filter)，一个是呈现过滤器(Renderer Filter)，用在发送端，用于向网络中发送音频文件和实时音频；另一个是源过滤器(Source Filter)，用在接收端，用于接收从网络中发送过来的音频流。 最后，对论文所做工作加以总结，指出论文中的不足和进一步研究的方向。更多还原

【Abstract】 The algorithm of IP multicast routing and the application of multicast in network multimedia are researched in this paper.First,the paper gives an overview on the basic theory of multicast,including multicast routing algorithms,multicast routing protocols and Internet Group Management Protocols. On the basis of this,a new algorithm of selecting multicast route was brought up,which applies in the case that there are only one multicast sender and many receivers. The algorithm is independent of the unicast routing protocol. When the receiver wants to join in a multicast group,it sends a request message to the sender with a TCP connection. The request message gets to the sender and the sender answers for it with a confirmed message. During the confirmed message returning to the receiver,the router along the pass forms the multicast routing information according to the confirmed message.Second,the paper introduces the theory of Real-time Transport Protocol (RTF) and the DirectShow technology. Using RTF,with the help of DirectShow’s frame,two Filters are programmed to send and receive multicasting data in the application research. One filter,a Tenderer filter,is used in the sender side to send audio file or real-time audio to the network. Another,a source filter,is used in the receiver side to receive audio stream from the network.Finally,a summary is given to show what have done in the paper. The drawback of the paper and the direction of further research are pointed out.更多还原