基于门限的连续媒体流动态播放算法及其参数研究  

Threshold-based dynamic playout algorithm and choice of its parameters for continuous streams

作　　者：许延[1] 常义林[1] 刘增基[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2003年第2期215-219,共5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);ISN国家重点实验室资助项目

摘　　要：从端系统的观点解决视频媒体的同步连续播放,提出了一种动态的媒体播放算法.该方法在接收端设置缓冲区,根据缓冲区的占用情况动态地调整媒体的播放速率.根据媒体内同步的要求,给出动态播放速率的选取方法.另外,通过分析所建立的排队模型,给出了缓冲区门限的选取原则.选择合适的参数,该算法可以有效地防止缓冲区下溢造成的播放停顿以及缓冲区上溢造成的播放跳跃,从而实现同步平滑播放.A dynamic playout algorithm is proposed in order to keep multimedia playing smoothly, which deals with the problem from the perspective of an end system. In the algorithm, playout rates of multimedia are variable according to the occupied buffer level with an intention of eliminating buffer underflow or overflow. The playout rates are chosen based on the requirement of the intramedia synchronization. To determine the thresholds of the occupied buffer level, a queuing model is established. Based on the analytical results, suitable thresholds can be determined according to the system parameters, including the probability of buffer underflow, the probability of buffer overflow, the average playout rate and the average occupied buffer level.

关 键 词：动态播放 缓冲区门限 视频媒体 同步连续播放 多媒体通信 

分 类 号：TN919.85[电子电信—通信与信息系统]