基于RTP/RTCP协议的实时数据传输与同步控制策略  

Real-Time Data Transport and Synchronization Scheme Based on RTP /RTCP

作　　者：任延珍[1] 喻占武[1] 胡瑞敏[1] 

机构地区：[1]武汉大学多媒体网络通信工程湖北省重点实验室,武汉430079

出　　处：《计算机工程与应用》2003年第10期144-147,共4页Computer Engineering and Applications

基　　金：国家测绘科技发展基金(编号:97009);湖北省自然科学基金(编号:98J080)资助项目

摘　　要：针对分组交换网络中的实时媒体传输,考虑非QOS保证的分组网络可能带来的传输丢包、乱序和抖动等情况,采用基于RTP/RTCP协议的媒体传输和媒体控制机制,在媒体流中添加时间戳等控制信息,通过播放时延控制算法进行媒体内同步,并在媒体内同步的基础上,根据发送方的绝对时间戳和RTP时间戳的对应关系,确定不同媒体流之间的同步点,从而达到多通道媒体间同步的效果。The synchronization of Real-Time multimedia transport is an important issue on non-qos packet based net-work which does not guratee the tranport quality and cause some troubles such as pakcet loss,packet out-of=order and transport jitter.To slove this problem,the paper proposes a scheme which is based on RTP/RTCP,adds control informa-tion such as relative timestamp and absolute timestamp in media stream and media-control stream,receiver will adopt an apropriate play-back delay according to the timestamp in sender's media stream to achieve the intramedia Synchro-nization,and find the Synchronization point between two meida stream through the relationship between the relatives timestamp and absolute timestamp in controlstream to achieve the intermedia Synchronization.

关 键 词：RTP/RTCP协议 实时数据传输 同步控制策略 计算机网络 分组交换网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]