| With the development of society and science and technology, People’s ideas have been changed. They require the protection of the personal and property safety.And they also hope to improve automatic production efficiency. Therefore, the demand for long-range video frequency monitors has appeared. Because of the popularity of the network, the development of electronic and computer technology, the breakthrough of the information code compression technology and the enlarging of network bandwidth, the plug- and- play IP cameras come into being.In this paper, based on developing history of the video monitoring system, the author presents the advantages and Characteristics of the network cameras, and analyzes the development of IP cameras and the reason of the rise of IP cameras. The author also made an assessment of the IP camera technological development. Besides, this paper reports the network communication protocol which is used between the client and the server, SOCKET programming,communication mode ,communication process, process method of multi-thread . And in this paper the author gave an outline of the video & audio compression code standard, principle and characteristics and explained the principles that decode video & audio data with XVID, and the XVID interface function and introduced the audio and video program based on DirectDraw and the interface of DirectDraw.Secondly , this paper reports how to program in client, introduces the relationships Of all kinds of module of a program and function of all kinds of module of a program, in Client I resolve how to connect server, how to set network parameter and video parameter, resolve transmission of video & audio data and resolve how to select transmission protocol, and how to storage audio & video data that have received, decode audio & video data that have received by XVID in MPEG-4 standard, and explain how to grogram it the audio & video data that have decode is played by DirectDraw, and the process is explained by program flow. |
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