P2P流媒体技术原理及应用

P2P-Based Streaming Media Technology and Its Applications

基于P2P的流媒体技术是一项非常有前途的技术,该技术有两方面的优点:不需要互联网路由器和网络基础设施的支持,因此性价比高且易于部署;流媒体用户不只是下载媒体流,而且还把媒体流上载给其他用户,因此,这种方法可以扩大用户组的规模,且由更多的需求带来更多的资源。由于P2P流媒体系统中节点存在不稳定性,因此P2P流媒体系统需要在文件定位技术、节点选择技术、容错以及安全机制方面有所突破。此外在如何管理节点并建立发布树、如何应付不可预知的节点失效、如何适应网络状态变化方面也面临着一些挑战。

The P2P-based streaming media technology is very promising and has two advantages. First, because P2P-based streaming media network can distribute media data without the support of routers and specific network infrastructure, it is cost-effective and easy to deploy. Second, a streaming media user can not only download streaming media, but also supply streaming media to other users. Therefore, the user groups＇ scale can be expanded, and the more the demands increase, the more the available resources increase. As the peers in the P2P-based streaming media network are not stable, the P2P streaming media system needs improvement in the fields of file location technology, peer selection technology, fault-tolerance and security mechanism. Moreover, challenges such as managing the nodes, constructing a distribution tree, coping with the unpredictable failure of nodes, and adapting to changes in the network, also exist.