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1、毕业论文(设计)题目:基于RTP的linux实时语音通信系统的设计与实现II摘要随着信息社会的高速发展,Internet已经成为很多人生活不可缺少的一部分。当前Internet中流动的“比特”所代表的内容已从原来的数据逐渐向实时多媒体数据演变,它们的特点是对实时性要求非常高。但是,Internet是建立在TCP/IP之上的计算机网络,最初设计时的定位决定了它不适合实时数据的传输。因此,1996年1月IETF音视频传输工作颁布了针对实时应用的实时传输协议RTP/RTCP。RTP/RTCP使Internet从理论上具备了处理实时业务的能力,解决了媒体同步问题和满足了多媒体通信业务
2、的要求,现在在IP电话、网络多媒体会议、远程网络教学和远程网络诊断等领域都有着重大的应用。本文结合RTP/RTCP高实时性的特点,主要针对局域网,提出了音频数据采用G729a压缩,传输数据采用ortp库,在linux平台下开发的实时语音通信系统。本文首先介绍了实时传输协议的简单应用后,详细分析了RTP/RTCP协议;接着介绍系统的具体实现,主要分三个部分:音频数据的采集和播放,音频数据的解码和编码以及音频数据包的发送和接收。最后简单阐述了本系统在其他领域的可扩展性及前景。【关键词】实时性,音频传输,RTP/RTCP,音频压缩IIAbstractWiththerapiddeve
3、lopmentofinformationsociety,theInternethasbecomeanindispensablepartofalotofpeoplelife.ThecurrentflowsthroughtheInternet"bits"representedbythecontentsofwhichhavebeengraduallyfromtheoriginaldatatoreal-timemultimediadata,thecharacteristicofthemisveryhighdemandforreal-time.However,theInternetis
4、basedonTCP/IPcomputernetworks,theinitialdesignoflocationdeterminesitisnotsuitableforreal-timedatatransmission.Therefore,IETFaudioandvideotransmissionworkinJanuary1996issuedforreal-timeapplicationofreal-timetransmissionprotocolRTP/RTCP.RTP/RTCPmakeInternettheoreticallywiththereal-timeability
5、ofthebusiness,themediasynchronizationproblemsandmeettherequirementsofthemultimediacommunicationservice,theIPtelephone,network,multimediaconference,remotenetworkteachingandremotediagnosis,etcallhaveimportantapplications.Inthispaper,combiningwiththecharacteristicsofRTP/RTCPhighreal-timeperfor
6、mance,mainlyforlocalareanetwork(LAN),isputforwardusingG729aaudiodatacompression,datatransmissionusingortplibrary,developmentofreal-timevoicecommunicationsystemontheLinuxplatform.Thispaperfirstintroducesthesimpleapplicationofreal-timetransportprotocol,RTP/RTCPprotocolareanalyzedindetail.Then
7、thispaperintroducestheimplementationofsystem,mainlydividedintothreeparts:audiodataacquisitionandplayback,audiodatadecodingandencodingandaudiopacketssentandreceived.Thelastsimplyexpoundsthesystemscalabilityandprospectsinotherareas.【Keywords】Realtimeaudiot