Abstract: Proxy cache is a way to improve the Qos of internet accessing. It has been proved that the proxy cache have some effect on streaming media. Cache algorithm is the core of proxy cache which includes storage mode, replication policy and so on. In this paper, based on the storage mode which divided streaming media file into grades by the bite-rate, a dynamic replication algorithm (DRA) was brought forward to improve request-hit-number of proxy cache.

Key words: streaming media cache, proxy cache, replication policy, prefix cache, CBR, DRA

摘要： 流媒体代理服务器缓存是针对流媒体访问的一项技术,能有效的提高流媒体访问质量。缓存算法是缓存代理服务器的重要技术组成部分,包括缓存保存方式、替换算法及进入策略三个方面。文中将介绍一套针对固定码率(CBR)流媒体的缓存算法,在包含码率分级保存方法的同时,使用了包含流媒体缓存基本特性的动态替换算法(DRA,DynamicReplicationAlgorithm)。

关键词: 流媒体缓存, 缓存代理服务器, 替换算法, 前缀缓存, CBR, DRA