主动流媒体编码转换机制研究  

The Research of Active Media Transcoding Mechanism

作　　者：雷启明[1] 周利平[2] 

机构地区：[1]乐山师范学院计算机科学与技术系,四川乐山614001 [2]四川大学计算机学院,四川成都610064

出　　处：《四川师范大学学报（自然科学版）》2008年第6期770-774,共5页Journal of Sichuan Normal University（Natural Science）

基　　金：863项目基金(2002AA144020);四川省青年软件创新工程基金(04HJ027-027)资助项目

摘　　要：扩展了主动流媒体编码转换机制,该机制能进一步充分利用主动网络技术赋予网络的可编程、可计算的能力,除了只为同一组播内容建立一棵组播树外,组播源只发送一个最高质量的流媒体编码版本,在主动节点进行灵活的数据编码转换以满足组播用户的不同需求.该机制适用于任何种类流媒体的组播传输,不同的只是流媒体编码转换的复杂性和具体的编码转换过程.对该机制进行了大量的仿真实验,在协议设计和性能方面都予以了分析.In this paper, an extended active media transcoding mechanism is described which takes good advantages of the capability of programming and computing of active network. Only one muhicast tree is established and only one version of the media needs to be sent to perform transformations of the original data to the requested versions in intermediate nodes of the tree. This advanced multicast service can be used to stream a wide variety of streaming media content. This mechanism can be used to support either voice, audio or video content. The only difference lies in the implementation and the complexity of the respective transcoding processes. And many experiments to analyze the performance of the mechanism are presented.

关 键 词：编码转换 流媒体 主动网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]