The Research And Design Of VCR Streaming Media Server

Mobile communications and Internet are two focuses of the information industry now and they produce mobile Internet and its applications, which bring enormous bussiness opportunity to the information industry. Nowadays, people not only need text, voice, image, but also need multi-media information. thereby it forces the develop of Mobile Streaming Media, and then the server system of offering Streaming Media service also becomes the object of people's attention. The paper is other than based upon that to lucubrate the Subject.Due to the limited nature of hardware facilities, the VCR functions of mobile streaming media server has been effectively verified through a simple client in the cable network. It provides a reliable theoretical basis and practical experience for the development and application of the Streaming media technology. It also lays a solid foundation for the future research, and there are broad prospects for application.From the development background of mobile streaming media,the understanding of its domestic and international situation and the actual development of streaming media server, the paper first nails down the task of the author. Then it particularly analyzes the four important protocol of the realization of streaming media server: Session Description Protocal,Real Time Streaming Protocol,Real Time Transfer Control Protocol,Real Time Transfer Protocol. Through understanding of the protocol function, analysing of the protocol specific content , it separately set forth realization of each protocol. Among, the RTSP mostly analyses its six requests such as OPTIONS,DESCRIBE,ETUP,PLAY,PAUSE,TEARDOWN; the RTP mostly analyses RTP fixed package head, expanding of RTP head, subset of protocol, multiplexing of protocol; the RTP mostly analyses format of RTCP package, interval of sending RTCP, number of keeping session member, distribution of source describing bandwidth, report of sending and receiving.Following, via the analyzing of the requirement and considering of practice limit, basing systemic specific requirements and tasks, it designs the frame and structure of the server and confirms the key technology of the server, such as synchronization inside media, synchronization between media, manage of multithreading , the realization of VCR function on the media streaming server. Then according the arithmetic designed it carries through the realization of program flow module.At last, through debug and test of the sever by anoher testing system, we perfect the function of the sever. it more perfects the server's function through system debug and test. According the data of testing system,at the end of the paper it statistics system bandwidth utilization ratio, service response time, packet loss rate and draws the statistics graph.According the conclusion of test,it notify that system run smoothly and the function realized completely, which proves the feasibility of the whole design scheme. Finally it solves some problems that troubled me by the beginning of the paper.