Research On The Data Instauration And Error Correction Project Of Multimedia Transport System Based On UClinux

With the fast development of telecommunications in recent years, all kinds of multimedia business, gloriously, provide subsribers with various services. The service of the network transmission of real time multimedia data is practiced more and more broadly, and becomes the mainstream step by step. The original design purpose of IP network is to deal with non-realtime data, and just can provide "best effort" service. Therefore, it cannot provide the quality of service for multimedia services such as audio and video playback. Moreover, the real time multimedia service with high bandwidth occupation is growing more, in the condition of certain total bandwidth, every user has no enough bandwidth to receive multimedia service, so the playback performance is poor. One key problem in the research of real time multimedia service is how to increase the reliability of real time multimedia data transmission, and how to ensure QoS of telecommunications.This article introduces a practical proposal, which is based on the embedded operating system and can ensure the real time playback performance of multimedia service. Based on this proposal, this article analyses the method and progress of building embedded operating system on M5249C3 development board, and analyses and compares the data recovery method which is suitable for real time multimedia transmission.On the basis of the research on the technical background and development future of embedded operationg system and real time multimedia applications, this article describes the internal modules and external interfaces of development board M5249C3, analysis the fundamentals of embedded operating system uClinux and its realization on M5249C3, including the selection of kernel modules, the realization of JFFS file system, kernel compilation and program debugging. And then, it introduces the real time transmission protocol RFC 1889, and then on its basis analysizes the factors which affect the playback performance of real time multimedia, and the balance of the performance of real time multimedia. At last, this article brings up a method to use forward error correction proposal (RFC 2733) to ensure the performance of real time multimedia playback, and carries out practical test. The test shows that the FEC (forward error correction) proposal introduced in this article can greatly decrease the packet loss ratio, increase the performance of real time multimedia playback, increase the reliability of real time multimedia data...