一种面向多对象多媒体应用的同步控制方法  

Synchronization control scheme for multi-object multimedia applications

作　　者：姜学锋[1] 彭挺[2,3] 姜山[2] 杨冬[2] 

机构地区：[1]西北工业大学计算机学院,西安710049 [2]西安交通大学计算机科学与技术系,西安710049 [3]长安大学特殊地区公路工程教育部重点实验室,西安710064

出　　处：《计算机工程与应用》2010年第26期117-121,226,共6页Computer Engineering and Applications

基　　金：国家高技术研究发展计划(863)No.2004AA1Z2280;No.2008AA01Z131~~

摘　　要：多对象多媒体应用允许多路媒体同时呈现,其同步控制比较复杂,可分为传输过程中与呈现过程中的同步。然而现有的同步方法忽略了媒体在最后呈现过程中的同步,也没有考虑各媒体对象之间的同步要求差异。针对以上问题,为视频点播提出了一种在应用层上控制多对象多媒体同步呈现质量的方法。在采用多级缓冲门限实现媒体内同步反馈控制的基础上,依据主要媒体对象的呈现时间戳,在每一个呈现场景内调整次要媒体对象的呈现速率,从而实现媒体间的同步呈现。实验结果表明该方案能够有效地提高同步质量,且媒体间的同步性能平均提高28.45%。A multi-object multimedia application allows simultaneous presentation of multiple multimedia streams;its synchronization control is complicated which includes transmission synchronization and presentation synchronization.However, existing synchronization schemes ignore the synchronization of presentation process and the requirement difference for synchronizing different media objects.This paper presents a scheme which controls the quality of presenting multi-object multimedia synchronously on the application level for video-on-demand mode.Based on utilizing multi-threshold buffer to implement intra-media synchronization feedback control,the secondary medias＇ presentation rate is adjusted according to the primary media＇s presentation time stamp so as to achieve inter-media synchronization presentation.The experiment results demonstrate that the proposed scheme improves the quality of synchronization effectively, and the performance of inter-media synchronization increases 28.45% averagely.

关 键 词：多对象多媒体 同步呈现 媒体间同步 时间戳 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]