面向视频应用的BitTorrent协议优化  

Optimization on BitTorrent Protocol for Video Application

作　　者：李敏宁[1,2] 鱼滨[1] 杨力[1] 

机构地区：[1]西安电子科技大学计算机学院,陕西西安710071 [2]渭南职业技术学院,陕西渭南714000

出　　处：《计算机技术与发展》2015年第11期115-119,124,共6页Computer Technology and Development

基　　金：国家自然科学基金资助项目(61172147;61202390)

摘　　要：Bit Torrent协议是一种基于P2P(Peer to Peer)的文件共享协议,具有"用户越多,下载速度越快"的特点,尤其是针对大文件的下载,更能体现出系统的优越性。视频媒体流是近年来网络用户占有量最多的一类文件,随着消费者带宽的进一步增加,越来越多的人希望得到像视频点播这样的多媒体应用。传统的C/S架构在当用户数目急剧增加时,容易产生服务器过载现象,使用服务器集群或分布式系统成本增大。Bit Torrent能够较好地降低服务器负担,提高系统的扩展性和健壮性。但是Bit Torrent针对普通大文件的共享设计,对文件的片段选择是无序进行的,不能有效地支持视频大文件的点播和直播。文中针对视频大文件的点播需求,对Bit Torrent协议的片段选择算法进行优化,实现了视频文件的点播和直播。BitTorrent protocol is a file sharing protocol based on P2P （ Peer to Peer）, with ＂the more users the download faster＂ feature. It reflects the superiority of the system especially for large files. In recent years, video media streams are a class file that the most amounts of Internet users occupied. With the further increase of consumer bandwidth, more and more people want to get the multimedia applica- tions such as video on demand. The traditional C/S architecture, when a sharp increase is conducted in the number of users,prone to over- load the server,using the server cluster or distributed system to cause the cost increases. Bifl＇orrent can better reduce server load and im- prove the scalability and robustness of the system. But BitTorrent is designed for ordinary share large files, selecting the file fragments are disorder conduction,and cannot effectively support on-demand and live video for large files. In this paper,for video-on-demand needs of large files, fragment selection algorithm is optimized of BitTorrent protocol, realizing on-demand and live of video files.

关 键 词：BITTORRENT协议 P2P技术 片段选择算法 视频流 

分 类 号：TP31[自动化与计算机技术—计算机软件与理论]