The Design And Implementation Of The VOD System Based On P2P Streaming Media

The study of the various issues in the streaming media data transmission and application layer multicast technology on the basis of the modern university campus network to broadcast live online teaching system as the background, P2P, streaming media combine to achieve based on the transmission of streaming media P2P VOD system. Mainly include the construction of multicast tree algorithm, the transmission scheduling strategy, message transfer mechanism, NAT firewall traversal, and so forth. In this paper, the key questions are as follows:1. application layer multicast protocol choice. In considering the entire system of transmission strategy, based on the cluster level multicast tree Construction Adaptive Distributed agreement NICE.2. system messaging mechanism. P2P network coverage in the news multicast tree is in the form of UDP packet transmission, in order to enhance the text in the multicast tree on the efficiency of transmission, the system design was a separate format, the first for Canada contained in the data packet, when the node to receive streaming media data acquisition modules for data acquisition, it will form the basis of this report, re-processing of data packets.3. NAT firewall traversal. The system combines the tunnel through technology, through the tunnel when the news mechanism in the transmission of streaming media data between computers burrows with the transmission of all information using UDP way. Will be focal points as a mainframe information transmitted by the NAT Server, when a private network nodes exist in the need for NAT traversal, the two sides will be nodes through the hub Console (Server) news article, and ultimately determined to be node addresses and data transmission - slogan.4. System Implementation. Include client landing and cancellation, access to the client list, the client node and the addition of the withdrawal of the client cache strategy, the positioning of resources to find, stream flow receiver and transmitter can be achieved.The system uses Java, XML, and other language development, the cross-platform system stronger. Also presented in this paper based on P2P VOD system, when users demand more, but the faster transmission speed, so in theory demand users download unlimited nodes can be increased without having to consider the backbone network bandwidth and server problems. This system is not only technically easy to achieve, but also made full use of the idle users upstream channel to completely solve the backbone network and server load overload problems.