基于门限的连续媒体流动态播放算法及其参数研究

基于门限的连续媒体流动态播放算法及其参数研究

许延;常义林;刘增基

(西安电子科技大学综合业务网理论及关键技术国家重点实验室，陕西西安 710071)

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2003-04-20 发布日期:2003-04-20

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

XU Yan;CHANG Yi-lin;LIU Zeng-ji

(State Key Lab. of Integrated Service Networks, Xidian Univ., Xi’an China， 710071)

Received:1900-01-01 Revised:1900-01-01 Online:2003-04-20 Published:2003-04-20

摘要/Abstract

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.

关键词: 动态播放, 媒体内同步, 缓冲区门限

Abstract: 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 burrfer 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 verage playout rate and the average occupied buffer level.

Key words: dynamic playout, intramedia synchronization, threshold of buffer level

中图分类号:

TN915.01

许延;常义林;刘增基. 基于门限的连续媒体流动态播放算法及其参数研究[J]. J4, 2003, 30(2): 215-219.

XU Yan;CHANG Yi-lin;LIU Zeng-ji.

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

[J]. J4, 2003, 30(2): 215-219.