基于H.323的视频会议客户端的设计与实现
摘要
自“信息高速公路”提出以来,网络在全世界以惊人的速度发展着。Internet将全世界联系起来,LAN、WAN等局域网技术使局域网内资源、信息得以传播和共享。视频会议系统正是在这种背景下发展起来。基于H.323协议的IP网络视频会议系统,可以支持人们远距离进行实时音视频信息交流、开展协同工作,并且具有互操作性。H.323协议已经比较成熟,高端企业级产品已经出现了很多,但普通桌面型产品还并不是很成熟,目前视频会议系统正向灵活易用、大众平民化和家用小型化的方向发展。
本文介绍了VoIP相关协议H.323和SIP,并对两者进行了比较。然后对视频会议系统的发展、系统结构、组网方式等进行了简要的分析。接着介绍了基于H.323体系结构的桌面型视频会议客户端的设计以及实现过程。同时介绍了开发过程中作者遇到的开发难点,对解决过程进行了详细介绍。接着详细介绍了基于H.323的视频会议系统客户端软件的测试过程,作者进行了详细的、多方面的测试,设计了数十个测试用例,并对测试结果进行仔细分析,最后总结了开发过程中的收获,并且提出了今后的科研方向。
The network was developing at a surprising rate since the "information superhighway" was taken. Internet linked the world to together. The LAN resource and information could be transmitted and shared because of LAN and WAN. Video Conference System was booming in this background. IP network video conference System based on H.323 protocol can support the remote exchange of real-time audio and video information and the collaborative work. Those products based on H.323 have interoperability. H.323 protocol has been relative mature. At present, there have been a lot of H.323 enterprise-class products. But the ordinary desktop products are not very mature. H.323 protocol still has a strong advantage in the field of the video communication.
This paper introduces protocols related VoIP, including H.323 and SIP, and compares them. Then I analyze simply the development, system architecture and networking method about the video conference system. It is particular introduced about the design and realization process of the desktop client of the video conference based on H.323 architecture. At the same time, this paper also introduces the difficulties in the development process and the settlement process in detail. In addition, the testing process of the client software is introduced in detail. The author has done testing carefully, designed many test cases, analyzed the test results, and pointed the direction of the future work.
本文介绍了VoIP相关协议H.323和SIP,并对两者进行了比较。然后对视频会议系统的发展、系统结构、组网方式等进行了简要的分析。接着介绍了基于H.323体系结构的桌面型视频会议客户端的设计以及实现过程。同时介绍了开发过程中作者遇到的开发难点,对解决过程进行了详细介绍。接着详细介绍了基于H.323的视频会议系统客户端软件的测试过程,作者进行了详细的、多方面的测试,设计了数十个测试用例,并对测试结果进行仔细分析,最后总结了开发过程中的收获,并且提出了今后的科研方向。
The network was developing at a surprising rate since the "information superhighway" was taken. Internet linked the world to together. The LAN resource and information could be transmitted and shared because of LAN and WAN. Video Conference System was booming in this background. IP network video conference System based on H.323 protocol can support the remote exchange of real-time audio and video information and the collaborative work. Those products based on H.323 have interoperability. H.323 protocol has been relative mature. At present, there have been a lot of H.323 enterprise-class products. But the ordinary desktop products are not very mature. H.323 protocol still has a strong advantage in the field of the video communication.
This paper introduces protocols related VoIP, including H.323 and SIP, and compares them. Then I analyze simply the development, system architecture and networking method about the video conference system. It is particular introduced about the design and realization process of the desktop client of the video conference based on H.323 architecture. At the same time, this paper also introduces the difficulties in the development process and the settlement process in detail. In addition, the testing process of the client software is introduced in detail. The author has done testing carefully, designed many test cases, analyzed the test results, and pointed the direction of the future work.
引文
[1]张江山,鲁平.视频会议系统及其应用.北京:北京邮电出版社,2002
[2]吴志军,马兰,沈笑云.Visual C++视频会议开发技术与实例.北京:人民邮电出版社,2006
[3]糜正琨.IP网络电话技术[M].北京:人民邮电出版社,2000
[4]Collins D.Carrier grade voice over IP[M].New York:McGrawHill Professional,2002
[5]Phu Truong;Nieh D;Moh M,Specification-based intrusion detection for H.323-based voice over IP,Signal Processing and Information Technology,2005,Proceedings of the Fifth IEEE International Symposium on 18-21 Dec,2005 Page(s):387-392
[6]Ray mundo,B.M;Pedro,G.A;Luis,V.L.J,Implimentation of Voip at the University of Colima,Utilizing H.323 Protocol,Electrical and Electronics Enqineering,2006 3~(rd)International Conference on Sept,2006 Page(s):1-4
[7]OpenH323 project[EB/OL].http://www.openh323.rog,1993-2007
[8]毕敏娜,王清阳,胥布工 基于H.323的视频会议系统及应用 微计算机信息 2006年第22卷 156-158
[9]ITU-T Recommendation H.323-2003,Packet-based multimedia communication systems[S].
[10]ITU-T Recommendation H.225.0-2003,Call signalling protocols and media stream packetization for packet-based multimedia communication systems[S].
[11]ITU-T Recommendation H.245-2005,Control protocol for multimedia communication[S].
[12]张荣,武波 SIP协议的应用研究 计算机技术与发展 2006.6 71-73
[13]2006-2007年度中国视频会议市场研究报告.Available[Online]:http://data.chinabyte.com/460/3053460.shtml
[14]张永光 基于H.323协议的视频会议系统研究 视频技术应用与工程2006.8 128-130
[15]马二虎 基于H.323协议的视频会议系统的研究和实现[学位论文],北京邮电大学,2006
[16]卢海燕 基于H.323协议的桌面视频会议系统的研究与实现[学位论文],北京邮电大学,2005
[2]吴志军,马兰,沈笑云.Visual C++视频会议开发技术与实例.北京:人民邮电出版社,2006
[3]糜正琨.IP网络电话技术[M].北京:人民邮电出版社,2000
[4]Collins D.Carrier grade voice over IP[M].New York:McGrawHill Professional,2002
[5]Phu Truong;Nieh D;Moh M,Specification-based intrusion detection for H.323-based voice over IP,Signal Processing and Information Technology,2005,Proceedings of the Fifth IEEE International Symposium on 18-21 Dec,2005 Page(s):387-392
[6]Ray mundo,B.M;Pedro,G.A;Luis,V.L.J,Implimentation of Voip at the University of Colima,Utilizing H.323 Protocol,Electrical and Electronics Enqineering,2006 3~(rd)International Conference on Sept,2006 Page(s):1-4
[7]OpenH323 project[EB/OL].http://www.openh323.rog,1993-2007
[8]毕敏娜,王清阳,胥布工 基于H.323的视频会议系统及应用 微计算机信息 2006年第22卷 156-158
[9]ITU-T Recommendation H.323-2003,Packet-based multimedia communication systems[S].
[10]ITU-T Recommendation H.225.0-2003,Call signalling protocols and media stream packetization for packet-based multimedia communication systems[S].
[11]ITU-T Recommendation H.245-2005,Control protocol for multimedia communication[S].
[12]张荣,武波 SIP协议的应用研究 计算机技术与发展 2006.6 71-73
[13]2006-2007年度中国视频会议市场研究报告.Available[Online]:http://data.chinabyte.com/460/3053460.shtml
[14]张永光 基于H.323协议的视频会议系统研究 视频技术应用与工程2006.8 128-130
[15]马二虎 基于H.323协议的视频会议系统的研究和实现[学位论文],北京邮电大学,2006
[16]卢海燕 基于H.323协议的桌面视频会议系统的研究与实现[学位论文],北京邮电大学,2005