面向对象的分布式视频会议系统模型

Object-Oriented Model for Distributed Video-Conference System

针对分布式视频会议 ,提出了一个基于对象的分层系统模型 ,描述了组成系统的各种构件的对象化方法和多媒体间的语义关系 .这种模型将多媒体数据流在I/O级、处理级和传输网络级进行对象分解 .多个对象的分布处理 ,易于按数据流编程实现 ,能很好地适应编程环境和网络环境 .该模型可充分开发不同粒度的并行性 ,使媒体处理满足实时应用的需求 .程序模块具有很好的可重用性 ,有利于在不同操作环境下系统的实现及互通 .

A video conference system is developed using a layered model. Object oriented components and semantic relations among multimedia are specified. The model decomposes the multimedia data into a set of objects at the I/O level, processing level, transport level and network level, respectively, where different objects could be handled simultaneously. It is easy to implement the system by data flow programming; it is adaptive to programming and networking environments. Based on this model, the parallelisms with various granularities could be exploited for real time applications. The program modules based on the model have a good reusability such that systems under different operational environments could be developed easily, and this facilitates intercommunications.