基于TAPI3.0的IP组播视频会议系统的研究与实现
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摘要
随着网络技术和多媒体技术的迅速发展,视频会议系统的研究和应用已经成为一个世界性的热点。当前,视频会议系统呈现出两个主要的发展趋势:一是由传统基于专用网的视频会议模式向基于Internet的视频会议模式发展;二是由硬件的视频会议解决方案向纯软件的视频会议解决方案发展。另外,IP组播技术的不断成熟,组播应用的范围越来越广泛,开发基于组播的应用也就显得日益重要。国内对于采用Microsoft TAPI3.0构建视频会议系统的研究不多见,并且没有针对于IE浏览器的实现方案。在这种背景下,本论文以Microsoft TAPI3.0作为核心组件,构建了一套基于IE浏览器的纯软件实现的组播视频会议系统。
本论文详细介绍了微软TAPI3.0的体系结构和对象模型、TAPI3.0中的H.323通信和IP组播会议服务体系。还有Windows 2000活动目录、DirectShow、Site Server ILS服务等实现系统所用到的技术。在此基础上,根据项目要求,详细描述了系统功能、系统网络结构和系统部署情况。
文章最重要的部分是详细阐述了如何利用TAPI3.0 API COM组件提供的丰富接口函数,实现了会议管理、组播视频会议和点对点会议三个模块。最后,经过对系统在安全性、通信能力和通信效果三方面的测试,给出了实验结果,并且在“系统对Mbone的依靠性”和“系统展望”方面进行了探讨。
本文提供了一种基于IE浏览器实现中小型视频会议的解决方案,并且按照设计要求进行了系统的开发。鉴于当前多媒体的组播通信方兴未艾,基于IP网的视频会议系统更是研究中的热点,因此开展该方面的实验研究具有较高的研究和应用价值。
With the rapid development of the network technology and multimedia technology, study and application of video conferencing system have become one of the world focuses. At present, the video conferencing system demonstrates two main development trends. First, the mode of video conferencing based on private Network is developing into that based on Internet. Second, the solution of video conferencing is developing from hardware towards software. In addition, IP multicast technology is ripe, and the range of application based on multicast is more and more extensive. So it is increasingly importance for the development of the application based on multicast. The study of video conferencing system adopting Microsoft TAPI3.0 is seldom inside. And there is not a solution which aims at IE Browser. Under the background, this paper discusses how to adopt the TAPI3.0 of Microsoft to construct a set of multicast videoconferencing system based on IE Browser.This paper introduces the system construction and TAPI3.0 (Telephony Application Program Interface) Object Model of Microsoft, communication of H.323 and the service system of IP multicast conferencing in detail. And the technologies used for implementing the system are introduced, such as Windows 2000 Active Directory, DirectShow, Site Server ILS Service, etc. On these foundations, according to the project request, it describes the functions of system, network structure and the setting-up of system.The most important part of the article is to explain in detail how to utilize abundant interface functions of TAPI3.0 API COM components. With the help of them, we have realized three important modules, which are conferencing management, multicast conferencing and peer-to-peer conferencing. Finally, we provide the experimental result after finishing the test of the system. The test includes the security of system, communication capabilities and communication results. And "the attribute of depending on Mbone" and "prospect of the system" are discussed.This paper aims to provide a kind of solution to the small or middle video
conferencing system based on IE Browser, and precede the development of the application according to the desired design. Nowadays the multicast communication is in the ascendant and the study of video conferencing system based on IP is hot. So the present research work has both practical and investigative values.
本论文详细介绍了微软TAPI3.0的体系结构和对象模型、TAPI3.0中的H.323通信和IP组播会议服务体系。还有Windows 2000活动目录、DirectShow、Site Server ILS服务等实现系统所用到的技术。在此基础上,根据项目要求,详细描述了系统功能、系统网络结构和系统部署情况。
文章最重要的部分是详细阐述了如何利用TAPI3.0 API COM组件提供的丰富接口函数,实现了会议管理、组播视频会议和点对点会议三个模块。最后,经过对系统在安全性、通信能力和通信效果三方面的测试,给出了实验结果,并且在“系统对Mbone的依靠性”和“系统展望”方面进行了探讨。
本文提供了一种基于IE浏览器实现中小型视频会议的解决方案,并且按照设计要求进行了系统的开发。鉴于当前多媒体的组播通信方兴未艾,基于IP网的视频会议系统更是研究中的热点,因此开展该方面的实验研究具有较高的研究和应用价值。
With the rapid development of the network technology and multimedia technology, study and application of video conferencing system have become one of the world focuses. At present, the video conferencing system demonstrates two main development trends. First, the mode of video conferencing based on private Network is developing into that based on Internet. Second, the solution of video conferencing is developing from hardware towards software. In addition, IP multicast technology is ripe, and the range of application based on multicast is more and more extensive. So it is increasingly importance for the development of the application based on multicast. The study of video conferencing system adopting Microsoft TAPI3.0 is seldom inside. And there is not a solution which aims at IE Browser. Under the background, this paper discusses how to adopt the TAPI3.0 of Microsoft to construct a set of multicast videoconferencing system based on IE Browser.This paper introduces the system construction and TAPI3.0 (Telephony Application Program Interface) Object Model of Microsoft, communication of H.323 and the service system of IP multicast conferencing in detail. And the technologies used for implementing the system are introduced, such as Windows 2000 Active Directory, DirectShow, Site Server ILS Service, etc. On these foundations, according to the project request, it describes the functions of system, network structure and the setting-up of system.The most important part of the article is to explain in detail how to utilize abundant interface functions of TAPI3.0 API COM components. With the help of them, we have realized three important modules, which are conferencing management, multicast conferencing and peer-to-peer conferencing. Finally, we provide the experimental result after finishing the test of the system. The test includes the security of system, communication capabilities and communication results. And "the attribute of depending on Mbone" and "prospect of the system" are discussed.This paper aims to provide a kind of solution to the small or middle video
conferencing system based on IE Browser, and precede the development of the application according to the desired design. Nowadays the multicast communication is in the ascendant and the study of video conferencing system based on IP is hot. So the present research work has both practical and investigative values.
引文
[1] 陈柏生、郑建德、施华,IP视频会议系统及其关键技术,厦门大学学报(自然科学版),2004,Vol.43 Sup.
[2] 陈凯,中国宽带市场发展透析,通信企业管理,2005年02期,21～22.
[3] 杨菠,视频会议系统发展分析报告,江苏通信技术,2003,Vol.19,No.3.
[4] Visual Telephone System and Terminal Equipment for local Area Networks which Provide a Nonguaranteed Quality of Service, ITU-T Recommendation H.323 [S] 199626.
[5] Narrow Band ISDN Visual Telephone Systems and Terminal Equipment, ITU-T Recommendation H.320[S] 199626.
[6] Terminal for Low Bitrate Multimedia Communication, ITU-T Recommendation H.324[S] 199626.
[7] 封浩宇、郑力明,分布式视频会议系统的软件实现,广东通信技术,2002,Vol.22,No.11, 35～41.
[8] Thomas C.Schrnidt, Matthias Wahlisch, Hans L.Cycon, Mark Palkow, Global serverless videoconferencing over IP, Future Generation Computer Systems, 2003, Vol.19, Issue.2, 219～227.
[9] Http://www.liumeiti.com/art/new/200542192515197.htm
[10] 赵洪利,视频技术的最新发展,中国计算机报,2003.10.
[11] Http://www.liumeiti.com/art/Service/200482124947149.htm
[12] Http://www.win118.com/efala/598624334/home
[13] Http://www.viewgood.com
[14] Http://www.penteview.com
[15] 杨丹,视频会议由“硬”到“软”的发展趋势,当代通信,2004年08期.
[16] 徐志宏,视频会议系统在专网中的应用,中国远程教育,2004年12期,52～53.
[17] Loic Bernable aka leto, Technical review about the mbone, 1999.8.
[18] Microsoft Corporation. IP Telephony with TAPI3.0. White Paper, 1999.
[19] Anjali Agarwal, Kang Bin Wang, Supporting Quality of Service in IP multicast networks, Computer Communications, 2003, Vol.26, Issue.14, 1533～1540.
[20] Lu.G, Support for multimedia communications over the internet, Computer Communications, 2000, Vol.23, Issue.14～15, 1321～1322.
[21] 张杰,IP电话面临机遇与挑战,世界电信,2004年10期,3～5.
[22] 张登银、张玮伟,基于TAPl3.0的IP电话连接与控制,微机发展,2004,Vol.14,No.11,71～73.
[23] 黄求根、吴宛萍、卢强华,TAPl3.0的体系结构与应用,计算机应用研究,2000年01期,33～34.
[24] James Toga、Jorg Ott, ITU-T standardization activities for interactive multimedia communications on packet-based networks:H.323 and related recommendations, Computer Networks, 1999, Vol.31, Issue.3, 205-223.
[25] 王菽兰、赵东风,H.323视频会议体系结构的应用研究,云南民族学院学报(自然科学版),2003,Vol.12,No.2.
[26] Pantelis Balaouras, loannis Stavrakakis、Lazaros Merakos, Potential and limitations of a teleteaching environment based on H.323 audio-visual communication systems, Computer Networks, 2000, Vol.34, Issue.6, 945-958.
[27] 李勇、袁红照,基于h.323标准的视频会议系统的设计与实现,安阳师范学院学报,2004年05期,61～44.
[28] Michael R.Macedonia、Donald P.Brutzman, Mbone Provides Audio and Video Across the Internet, IEEE Computer, 1994.4.
[29] 吴洪潭,MBone网络技术的发展与应用,现代计算机,2003年07期.
[30] Microsoft Corporation. Platform SDK. 2003.
[31] 桂宁、陈松乔、黄东军,基于TAPl3.0的IP多播桌面会议系统,计算机工程与应用,2002年16期,165～167.
[32] 李发旭、卫良,Windows2000活动目录技术及其应用,青海师范大学学报(自然科学版),2004年01期,36～39.
[33] 向炜、赵文静,活动目录服务及应用,微机发展,2003,Vol.13,11-14.
[34] Http://www.avcom.cn/
[35] 沈俊、罗军舟、顾冠群,基于策略和域的网络管理,计算机工程与应用,2001年23期,22～25.
[36] GAO Yu-jin、SHI Feng, ZHANG Yan-su, Adaptive DirectShow Framework for Layered MPEG-4 Video Multicast, Journal of Beijing Institute of Technology, 2003, S1.
[37] 谢亚光、章琦、刘济林,基于Microsoft DirectShow的多媒体应用程序开发,计算机应用研究,2003年04期,72～74.
[38] M.Handley、J.Crowcroft, C.Bormann、J.Ott, Very large conferences on the Internet: the Intemet multimedia conferencing architecture, Computer Networks, 1999, Vol.31, Issue.3, 191～204.
[39] 张金波、孙海翠、郑雪峰,COM技术及其程序设计,河海大学常州分校学报,2004年02期,34～38.
[40] 孔梦荣、郑秋生、杜献峰,COM组件技术探究,中原工学院学报,2004,Vol.15,No.2.
[41] 郑晓光、铁玲、诸鸿文,LDAP目录服务的身份认证机制研究,信息安全与通信保密,2004年01期,30～32.
[42] 童舜海、丁风雷,Active Directory与Windows2000安全性,丽水师范专科学校学报,2001,Vol.23.No.2
[43] Douglas E.Comer, Computer network and internet[M]. Prentice Press, 1999.
[44] 李彦新,虚拟专用网(VPN)技术及其应用,交通与计算机,2004年04期,71～73.
[45] 封浩宇,IP VPN在电信运营网中的实现,电信科学,2002年04期,13～15.
[46] 鹿凯宁、周慧勇,LDAP目录服务的研究及其在internet上的实现,天津通信技术,2002年01期,37～41.
[47] 贾凤军,netmeeting在校园办公网的应用,计算机与网络,2003年19期,40.
[48] Tie Liao, WebCanal: a multicast Web application, Computer Networks and ISDN Systems, 1997, Vol.29, Issue.8-13, 1091-1102.
[49] Sudhir Aggarwal、Sanjoy Paul、Daniel Massey、Daniela Caldararu, A flexible muiticast routing protocol for group communication, Computer Networks, 2000, Vol.32, Issue.1, 35-60.
[50] Shutang Yang、Shengsheng Yu、Jingli Zhou、QiHan, Multipoint communications with speech mixing over IP network, Computer Communications, Vol.25, Issue.1, 46～55.
[51] 黄东军,一个基于IP组播技术的桌面视频会议系统,湖南工业职业技术学院学报,2002,Vol.2,No.2.
[52] 周强、赵鹭娜、罗焱、黄东军,基于netmeeting组件的web模式个人会议系统,微型电脑应用,2002年12期,63～64.
[2] 陈凯,中国宽带市场发展透析,通信企业管理,2005年02期,21～22.
[3] 杨菠,视频会议系统发展分析报告,江苏通信技术,2003,Vol.19,No.3.
[4] Visual Telephone System and Terminal Equipment for local Area Networks which Provide a Nonguaranteed Quality of Service, ITU-T Recommendation H.323 [S] 199626.
[5] Narrow Band ISDN Visual Telephone Systems and Terminal Equipment, ITU-T Recommendation H.320[S] 199626.
[6] Terminal for Low Bitrate Multimedia Communication, ITU-T Recommendation H.324[S] 199626.
[7] 封浩宇、郑力明,分布式视频会议系统的软件实现,广东通信技术,2002,Vol.22,No.11, 35～41.
[8] Thomas C.Schrnidt, Matthias Wahlisch, Hans L.Cycon, Mark Palkow, Global serverless videoconferencing over IP, Future Generation Computer Systems, 2003, Vol.19, Issue.2, 219～227.
[9] Http://www.liumeiti.com/art/new/200542192515197.htm
[10] 赵洪利,视频技术的最新发展,中国计算机报,2003.10.
[11] Http://www.liumeiti.com/art/Service/200482124947149.htm
[12] Http://www.win118.com/efala/598624334/home
[13] Http://www.viewgood.com
[14] Http://www.penteview.com
[15] 杨丹,视频会议由“硬”到“软”的发展趋势,当代通信,2004年08期.
[16] 徐志宏,视频会议系统在专网中的应用,中国远程教育,2004年12期,52～53.
[17] Loic Bernable aka leto, Technical review about the mbone, 1999.8.
[18] Microsoft Corporation. IP Telephony with TAPI3.0. White Paper, 1999.
[19] Anjali Agarwal, Kang Bin Wang, Supporting Quality of Service in IP multicast networks, Computer Communications, 2003, Vol.26, Issue.14, 1533～1540.
[20] Lu.G, Support for multimedia communications over the internet, Computer Communications, 2000, Vol.23, Issue.14～15, 1321～1322.
[21] 张杰,IP电话面临机遇与挑战,世界电信,2004年10期,3～5.
[22] 张登银、张玮伟,基于TAPl3.0的IP电话连接与控制,微机发展,2004,Vol.14,No.11,71～73.
[23] 黄求根、吴宛萍、卢强华,TAPl3.0的体系结构与应用,计算机应用研究,2000年01期,33～34.
[24] James Toga、Jorg Ott, ITU-T standardization activities for interactive multimedia communications on packet-based networks:H.323 and related recommendations, Computer Networks, 1999, Vol.31, Issue.3, 205-223.
[25] 王菽兰、赵东风,H.323视频会议体系结构的应用研究,云南民族学院学报(自然科学版),2003,Vol.12,No.2.
[26] Pantelis Balaouras, loannis Stavrakakis、Lazaros Merakos, Potential and limitations of a teleteaching environment based on H.323 audio-visual communication systems, Computer Networks, 2000, Vol.34, Issue.6, 945-958.
[27] 李勇、袁红照,基于h.323标准的视频会议系统的设计与实现,安阳师范学院学报,2004年05期,61～44.
[28] Michael R.Macedonia、Donald P.Brutzman, Mbone Provides Audio and Video Across the Internet, IEEE Computer, 1994.4.
[29] 吴洪潭,MBone网络技术的发展与应用,现代计算机,2003年07期.
[30] Microsoft Corporation. Platform SDK. 2003.
[31] 桂宁、陈松乔、黄东军,基于TAPl3.0的IP多播桌面会议系统,计算机工程与应用,2002年16期,165～167.
[32] 李发旭、卫良,Windows2000活动目录技术及其应用,青海师范大学学报(自然科学版),2004年01期,36～39.
[33] 向炜、赵文静,活动目录服务及应用,微机发展,2003,Vol.13,11-14.
[34] Http://www.avcom.cn/
[35] 沈俊、罗军舟、顾冠群,基于策略和域的网络管理,计算机工程与应用,2001年23期,22～25.
[36] GAO Yu-jin、SHI Feng, ZHANG Yan-su, Adaptive DirectShow Framework for Layered MPEG-4 Video Multicast, Journal of Beijing Institute of Technology, 2003, S1.
[37] 谢亚光、章琦、刘济林,基于Microsoft DirectShow的多媒体应用程序开发,计算机应用研究,2003年04期,72～74.
[38] M.Handley、J.Crowcroft, C.Bormann、J.Ott, Very large conferences on the Internet: the Intemet multimedia conferencing architecture, Computer Networks, 1999, Vol.31, Issue.3, 191～204.
[39] 张金波、孙海翠、郑雪峰,COM技术及其程序设计,河海大学常州分校学报,2004年02期,34～38.
[40] 孔梦荣、郑秋生、杜献峰,COM组件技术探究,中原工学院学报,2004,Vol.15,No.2.
[41] 郑晓光、铁玲、诸鸿文,LDAP目录服务的身份认证机制研究,信息安全与通信保密,2004年01期,30～32.
[42] 童舜海、丁风雷,Active Directory与Windows2000安全性,丽水师范专科学校学报,2001,Vol.23.No.2
[43] Douglas E.Comer, Computer network and internet[M]. Prentice Press, 1999.
[44] 李彦新,虚拟专用网(VPN)技术及其应用,交通与计算机,2004年04期,71～73.
[45] 封浩宇,IP VPN在电信运营网中的实现,电信科学,2002年04期,13～15.
[46] 鹿凯宁、周慧勇,LDAP目录服务的研究及其在internet上的实现,天津通信技术,2002年01期,37～41.
[47] 贾凤军,netmeeting在校园办公网的应用,计算机与网络,2003年19期,40.
[48] Tie Liao, WebCanal: a multicast Web application, Computer Networks and ISDN Systems, 1997, Vol.29, Issue.8-13, 1091-1102.
[49] Sudhir Aggarwal、Sanjoy Paul、Daniel Massey、Daniela Caldararu, A flexible muiticast routing protocol for group communication, Computer Networks, 2000, Vol.32, Issue.1, 35-60.
[50] Shutang Yang、Shengsheng Yu、Jingli Zhou、QiHan, Multipoint communications with speech mixing over IP network, Computer Communications, Vol.25, Issue.1, 46～55.
[51] 黄东军,一个基于IP组播技术的桌面视频会议系统,湖南工业职业技术学院学报,2002,Vol.2,No.2.
[52] 周强、赵鹭娜、罗焱、黄东军,基于netmeeting组件的web模式个人会议系统,微型电脑应用,2002年12期,63～64.