流媒体缓存代理单一流映像机制与流预取策略研究

Research of Single Streaming Image Mechanism and Streaming Pre-Fetching Policy in Streaming Media Caching Proxy

为了解决传统的流媒体服务模式(客户端/服务器)中存在的流媒体服务器负载重、客户端播放抖动频繁等问题,本文详细研究了实现流媒体缓存代理的单一流映像机制,并针对缓存代理端的接收和发送阶段提出了实现这一机制的相关算法.同时在深入研究流预取理论模型的基础上,创新性地提出了基于RTCP包反馈和RTP包网络延迟的流预取策略,从而保证了客户端的播放质量.测试表明单一流映像机制的正确性和流预取策略的高效性.

Traditional streaming media service pattern（client/server） has the problems of heavy load of streaming media server and frequent jitter during playback. To solve the issues mentioned above, the paper illustrates the Single Streaming Image （SSI） mechanism for implementing streaming media caching proxy system and proposes corresponding algorithms for receiving and sending streaming data. Also the paper does a deep research of theoretic model about streaming pre-fetching and innocatively proposes streaming pre-fetching policy based on the of RTCP packet feedback and RTP packet network delay, which can guarantee the quality of playback. The result of performance test shows that our proposed mechanisms including SSI and streaming pre-fetching are corrective and efficient.