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基于局域网的视频聊天室系统的设计与实现摘要视频聊天系统作为一种新型的通信和交流工具，突破了地域的限制，可以提供更为便捷、灵活、全面的音、视频信息的传递和服务，具有极其广泛的发展前景。本文介绍了采用MicrosoftVisualC++6.0编程开发视频聊天系统的一套比较常用的解决方案。文字聊天采用TCP模式；语音视频聊天采用UDP模式，在客户端之间点对点的进行。在该方案中，通过函数库VFW来实现视频捕获、影像压缩以及影像播放。微软公司提供的专门用于视频捕获开发的工具包VFW，为在Windows操作系统中实现视频捕获提供了标准的接口，从而大大降低了程序的开发难度。在视频传输方面，则通过组建视频帧，将位图形式的视频帧压缩成帧格式的Mpeg4流，传输到客户端后，解压并显示影像。同时，在本方案中，采用了线程来实现语音录制和语音回放，最终实现了通过服务器中转的文字聊天、点对点的语音视频聊天。关键词：文字聊天；VFW；视频捕获；视频传输；语音录制；语音回放TheDesignandRealizationofLAN-BasedVideoChatRoomSystemAbstractAsanewtoolaboutcommunication,videochattingsystemhasbrokenthroughgeographicalrestrictions,hasprovidesmoreconvenient,flexibleandcompletetransmissionandservice.Furthermore,ithasaverybrightfuture.ThecommonsolutionabouthowtodevelopavideochattingsystemisintroducedbytheMicrosoftVisualC++6.0programming.TCPmodelisusedinthetextchattingandUDPforthepoint-to-pointvideochatsbetweentheClients.Inthisplan,VideoCapture,VideoCompressionManagerandDrawDibarerealizedbythefunctionsofVFWLibrary.ThespecialkitVFW(VideoforWindows)invideocaptureofferedbyMicrosoftCorporation,hasprovidedastandardinterfaceforvideocaptureinWindowsOperatingSystemandthusgreatlyreducedthehardshipofprogramming.Invideotransmissionaspect,itrequiresavideoframewhichiscompressedthevideoframeofbitmapintoMpeg4steamofframeform.ThenitwillbedecompressedintoimagessinceithasbeenarrivedtheClient.Meanwhile,thethreadisusedtoachieveaudiorecordingandreplaying.Finally,ithasrealizedthetextchattingthroughaservertotransit,thepoint-to-pointaudioandvideochats.Keywords:textchatting;VFW;VideoCapture;videotransmission;audiorecording;audioplaying目录论文总页数：24页1引言...........................................................................................................................................11.1课题背景...........................................................................................................................11.2国内外研究现状...............................................................................................................12理论知识介绍...........................................................................................................................12.1VFW简介.........................................................................................................................12.2线程的实现方法...............................................................................................................43需求分析...................................................................................................................................53.1软硬件环境.......................................................................................................................53.2需求分析...........................................................................................................................54系统结构...................................................................................................................................74.1硬件结构...........................................................................................................................74.2软件结构...........................................................................................................................74.2.1功能需求..................................................................................................................74.2.2系统功能模块图......................................................................................................84.3系统各模块流程图...........................................................................................................85系统的详细设计.....................................................................................................................105.1文字聊天.........................................................................................................................105.1.1TCP套接字的运用...............................................................................................105.1.2文字聊天实现.........................................................................................................115.2语音视频聊天.................................................................................................................135.2.1UDP套接字的运用...............................................................................................135.2.2视频的捕获............................................................................................................145.2.3捕获窗口................................................................................................................165.2.4视频捕获驱动........................................................................................................185.2.5语音录制................................................................................................................185.2.6语音回放................................................................................................................195.2.7视音频的传输........................................................................................................20结论.......................................