| With the popularization of the Internet and broadband network supported by the current government and the rapid growth of the IPTV (television over IP) plan , the stream media service over network develops fast too. In order to supply the main two services–VOD (video on demand) and IPTV which are used popularly in the application, 8010R&D designed a new streaming media system based on our new operating system named Digital Organic System (DOS) with high dependability, high concurrence, low-price-high-efficiency and high retractility as its characters .In our stream media system , there are three important components. streaming media player used as an client software, stream media server , the storing and transmitting technology used in the system . As for our media player, the most important parts are three aspects. the design of the net-subsystem, the accomplish of the protocol stack and the design of streaming medias synchronization mechanism.These parts are so important that can influence the quality of our media player's work, so I go into details these parts in this paper , the main content is below.Firstly, this thesis briefly introduces the streaming media development trend, the basic concepts in this area including the basic important technologies and the stream media protocols standards. After that, this thesis introduces the Edcode (encode&decode) technologies such as MPEG-4.Secondly, after analyses the design of the main frame of the whole player and the importance of the net-subsystem in the player, this thesis pays more attention on the accomplishment of the idea. Then, this thesis describes the design details of the net-subsystem in the player. Those details include the interfaces between the main control module and the subsystem.Thirdly, this thesis emphasizes the application details about the implementation of the protocols such as RTSP,SDP,RTP&RTCP,including the major data structures , function interfaces and the details of the process of the analyzing Datagram . |
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