基于H.323的IP視頻會(huì)議系統(tǒng)
畢業(yè)論文
目 錄
前言 1
1 視頻會(huì)議系統(tǒng)相關(guān)知識(shí) 2
1.1 視頻會(huì)議系統(tǒng)的主要概念和應(yīng)用領(lǐng)域 2
1.2 H.320和H.323介紹 4
1.3 視頻會(huì)議基于各網(wǎng)絡(luò)的解決方案 6
2 視頻會(huì)議系統(tǒng)分析 10
2.1 系統(tǒng)需求分析 10
2.2 系統(tǒng)功能模塊分析 10
2.3 系統(tǒng)軟硬件平臺(tái) 11
2.4 總體設(shè)計(jì)原則及功能要求 11
3 視頻系統(tǒng)概要設(shè)計(jì) 12
3.1 系統(tǒng)運(yùn)行過程設(shè)計(jì) 12
3.2 系統(tǒng)程序總體結(jié)構(gòu) 12
3.3 系統(tǒng)運(yùn)行相關(guān)問題的解決 13
4 IP視頻系統(tǒng)各部分詳細(xì)設(shè)計(jì) 13
4.1 IP視頻會(huì)議系統(tǒng)的組成設(shè)計(jì) 14
4.2 實(shí)時(shí)通信客戶端接口設(shè)計(jì) 15
4.3 通信類型的選擇設(shè)計(jì) 15
4.4 調(diào)整通信設(shè)備設(shè)計(jì) 16
4.5 初始化1個(gè)會(huì)話設(shè)計(jì) 16
4.6 處理實(shí)時(shí)通信事件設(shè)計(jì) 20
4.7 創(chuàng)建1個(gè)通信會(huì)話設(shè)計(jì) 23
4.8 處理實(shí)時(shí)流會(huì)話事件設(shè)計(jì) 25
4.9 共享應(yīng)用程序和白板設(shè)計(jì) 34
4.10 視頻會(huì)議質(zhì)量保證設(shè)計(jì) 35
4.11 系統(tǒng)的安全保密設(shè)計(jì) 38
5 系統(tǒng)測(cè)試和運(yùn)行 44
5.1 系統(tǒng)測(cè)試硬件環(huán)境 44
5.2 系統(tǒng)總體測(cè)試 44
6 結(jié)束語 47
參考文獻(xiàn) 48
致謝 49
基于H.323的IP視頻會(huì)議系統(tǒng)
摘要：視頻會(huì)議就是通過終端與網(wǎng)絡(luò)，使身處異地的與會(huì)者可以就同1議題參與討論，相互之間不僅可以聽到發(fā)言者聲音而且還可以看到發(fā)言者的圖像及背景，同時(shí)還可以交流有關(guān)該議題的數(shù)據(jù)、文字、圖表等信息，因而與會(huì)者可獲得比電話會(huì)議豐富得多的各種信息。本次系統(tǒng)的設(shè)計(jì)是使用微軟實(shí)時(shí)通信（RTC）API創(chuàng)建音頻與視頻會(huì)議，共享應(yīng)用程序，共享白板，簡(jiǎn)單的點(diǎn)對(duì)點(diǎn)聊天對(duì)話以及整合音頻與視頻調(diào)節(jié)向?qū)У慕涌�。因�(yàn)閷?shí)時(shí)通信API為任何基于Microsoft Windows XP的應(yīng)用程序提供了基于個(gè)人計(jì)算機(jī)的通信性能——即時(shí)消息，音頻與視頻會(huì)議，應(yīng)用程序的共享/協(xié)作。具體設(shè)計(jì)過程中利用了H.323協(xié)議，通過會(huì)議終端、網(wǎng)關(guān)、網(wǎng)閘、IP網(wǎng)絡(luò)以及多點(diǎn)控制器（MCU），創(chuàng)建了1個(gè)端到端的接口連接，然后通過設(shè)置動(dòng)態(tài)端口監(jiān)視連接中的各端口的動(dòng)態(tài)事件，從而來進(jìn)行音視頻等多媒體數(shù)據(jù)的處理和會(huì)話事件的處理，包括RTC媒體事件、音頻強(qiáng)度事件、即時(shí)消息事件和會(huì)話狀態(tài)改變等。最后利用T.120標(biāo)準(zhǔn)實(shí)現(xiàn)電子白板，文件傳輸，應(yīng)用程序共享等數(shù)據(jù)應(yīng)用功能，實(shí)現(xiàn)比較完整的視頻會(huì)議過程。
關(guān)鍵詞：IP; H.323; 視頻會(huì)議
IP videoconference system Based on H.323
Abstract：The videoconference, through the terminal and the network, enables the people in different places to be able to discuss together. Those people can not only hear or see each other, but also can exchange associated information each other. So videoconference participants can acquire more information than telephone conference. Overall, the tone of a video stream based on IP videoconferencing system, is uses the video frequency technology and the IP data communication technology establishes the visible correspondence through the IP network between two or the many places, thus achieving images, a voice and data exchange format. Now, this system was designed using Microsoft real-time communications (RTC) API for audio and videoconferencing, achieving shared applications, achieving shared whiteboard, chat dialogue to achieve simple point-and the integration of audio and video interface guides. Because API for real-time communications provides performance-based personal computer communications for any applications based on Microsoft Windows XP, just like instant news, audio and videoconferencing, application sharing/collaboration. In the specific design process with a H.323 agreement, buy using the terminals, gateways, network gateway and IP networks and multi-point control units (MCU), build a point-to-point interface, monitor the dynamic incident of every port while joining through setting up the dynamic port, thus come to carry on the treatment of multimedia data such as the audio frequency and video ,etc. and treatment of conversation incident. Including RTC media incident, audio frequency intensity incident, instant news incident and conversation state change etc. At last Make use of T.120 standard for screen, document transmission, and data applications sharing application functions, realize more intact video conference course.
Keywords：IP; H.323; Videoconference
前言
會(huì)議是人類社會(huì)經(jīng)濟(jì)生活中不可缺少的1部分,有關(guān)的研究表明,有效的信息55%依賴于面對(duì)面的視覺效果,38%依賴于說話者的語音,而只有7%依賴于內(nèi)容。傳統(tǒng)通信工具，如電話、傳真等，都無法達(dá)到面對(duì)面或1群人聚集在1起的溝通效果。然而，圖像通信所占的帶寬太大，無法應(yīng)用于實(shí)際的通信中。進(jìn)入90年代，隨著ITU 制定第1個(gè)H.320標(biāo)準(zhǔn)和H.323標(biāo)準(zhǔn)，會(huì)議電視得到了很大的發(fā)展。
隨著多媒體的計(jì)算機(jī)技術(shù)和通信技術(shù)的發(fā)展，人們已經(jīng)不滿足簡(jiǎn)單的話音和文字通信，希望集語音、文字和圖像于1體的多媒體通信。這是繼電報(bào)、電話、傳真及電子郵件（E-MAIL）之后，點(diǎn)對(duì)多點(diǎn)的通信。它在同1傳輸線路上承載了多種媒體信息即視頻、音頻和數(shù)據(jù)等。實(shí)現(xiàn)多點(diǎn)實(shí)時(shí)交互通信，同時(shí)也可以將不同地點(diǎn)與會(huì)人員的活動(dòng)情況、會(huì)議內(nèi)容及各種文件以可視新聞的形式產(chǎn)縣在各個(gè)會(huì)場(chǎng)，這是1種快速高效、日益增長(zhǎng)、廣泛應(yīng)用的新的通信業(yè)務(wù)。
基于IP的音視頻流的視頻會(huì)議系統(tǒng)，是利用視頻技術(shù)和IP數(shù)據(jù)通信技術(shù)通過IP網(wǎng)絡(luò)在兩點(diǎn)或多個(gè)地點(diǎn)之間建立可視通信，實(shí)現(xiàn)圖像，語音及數(shù)據(jù)交流的1種會(huì)議形式。本設(shè)計(jì)的目的是讓與會(huì)者利用PC終端，攝像機(jī)和話筒等即能實(shí)時(shí)地看到對(duì)方發(fā)言人和會(huì)場(chǎng)場(chǎng)景，也能聽到對(duì)方的'聲音，再輔以電子白板，書寫電話等通信設(shè)備，即可實(shí)現(xiàn)與對(duì)方會(huì)場(chǎng)的與會(huì)人員進(jìn)行研討或磋商。
所以，本文主要是基于H.323的IP視頻會(huì)議系統(tǒng)的設(shè)計(jì)過程的具體的分析和相關(guān)問題的解決。對(duì)視頻會(huì)議系統(tǒng)的主要概念，相關(guān)應(yīng)用以及系統(tǒng)設(shè)計(jì)的需求進(jìn)行了分析，給出了系統(tǒng)的概要設(shè)計(jì)和詳細(xì)設(shè)計(jì)過程，介紹了IP視頻會(huì)議的實(shí)現(xiàn)原理及方法并給出了1個(gè)比較完整的IP視頻會(huì)議系統(tǒng)的實(shí)現(xiàn)代碼。
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