一种新的媒体同步反馈控制算法  

A new feedback control scheme for media synchronization

作　　者：吴炜[1] 常义林[1] 罗忠[2] 

机构地区：[1]西安电子科技大学综合业务网理论与关键技术国家重点实验室,陕西西安710071 [2]华为技术公司,广东深圳518129

出　　处：《西安电子科技大学学报》2006年第3期359-365,共7页Journal of Xidian University

基　　金：高等学校博士学科点专项科研基金资助项目(20010701006);综合业务网理论与关键技术国家重点实验室基金;华为基金资助项目

摘　　要：提出一种新的媒体同步反馈控制算法.该算法检测播放缓冲区的占用水平,发现失步时通过反馈的方式改变发送端媒体流的发送帧率,补偿时延抖动和网络异常,实现媒体内同步.在音频流和视频流保持媒体内同步的基础上,接收端同步启动播放音视频,从而达到媒体间同步.实验结果表明,该算法在不增加播放时延的情况下可以显著地降低媒体单元丢失率,保证单个媒体流的平滑播放,并实现音视频的媒体间同步.A new feedback control scheme for media synchronization is proposed. The playout buffer level is checked to detect asynchronism. Once an asynchronism occurs, a required corrective transmission frame rate of the media stream is fed back to the sender to compensate for delay jitter and network anomaly to restore intra-media synchronization. With intra-media synchronization within a single media stream such as audio and video performed, the receiver synchronously initiates to play them back, and then inter-media synchronization between audio and video is required. Experimental results show that in the case of an unincreased playout delay the scheme could remarkably decrease the probability of lost media unit. The scheme could keep continuous presentation of a single media stream, and require inter-media synchronization between audio and video.

关 键 词：播放缓冲区 时延抖动 媒体内同步 媒体间同步 

分 类 号：TN915.01[电子电信—通信与信息系统]