Instant Messages System Based On Jabber Protocol And H.264 Standard

With the development of broadband and encode/decode Technology, people are no longer satisify with the traditional communication forms.Image correspondence and data communication and multimedia transmit service becomes the mainstream of contemporary commucation forms. At present,more and more personal resource need to be share,more and more people need to communicate with each other online, the appearance of IM have greatly changed our lives. The reception of jabber protocol and the new generation international video coding standard H.264 will bring a miraculous leap of the international service.The main contents of the thesis are as follows:First,a brief introduction to the peer to peer technology and its advantage, especially focus on the theroy of data and system structure of jabber protocol.Define the practical application of jabber protocol contact with my topic background.Second,detailedly analyze the basic principle of video coding techonogy,define some important module of them ,such as intra prediction,coding conversion,coding entropy,this supply some clues to the deeply reserch in the next chapters.Third, Introduce the encoding principle of H.264 and elaborates on its main function modules of H.264 and new technologies being adopted: intra prediction, mufti-block inter prediction, 1/4 and 1/8 fractional pixel motion estimation,multiple reference frames, integer transform.Last,make use of Video For Windows technology to apply H.264 to the IM system based on jabber.Detail the basic principle and the realization of video data transport in the jabber system.The research is to analysis the Instant Messages system based on jabber protocol.The system is heavily tested during the research and implementation. It is very helpful for the related research.