桌面视频会议系统研究开发

Research and Development of Desktop Video Conference Systems

本文介绍了基于IP多播协议的桌面视频会议系统的结构、原理及实现方法,讨论了以MCU为核心的客户-服务器模型结构。为保证系统的实时性,我们将信令和多媒体数据分开处理,采用基于TCP协议的可靠连接策略构筑信令处理模块,设计了用于多媒体数据传输的CIgmpSocket类,保证了系统的实时性。另外,我们讨论了视频及信号的采集、压缩及回放问题,针对音频回放过程中周期性爆破噪音,提出了流水线播放技术。

This paper introduces the architecture, theory and implementation of desktop video conference systems based on IP multicasting protocols and discusses the structure of the client/server model linked up to a central MCU. In order to ensure realtime transmission, we deal with signal command and multimedia data respectively. We adopt a reliable connection strategy based on the TCP protocol to construct a signal command processing module and design a CIgmpSocket class to transmit multimedia data and ensure realtime transmission. These problems which include video collection, compression and playback are also discussed in the paper. At the end, aiming at the periodical plosive noise problem in the process of audio playback, we propose the technique of streamlined playback.