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1、畢業(yè)論文(設計)題目:基于RTP的linux實時語音通信系統(tǒng)的設計與實現(xiàn)II摘要隨著信息社會的高速發(fā)展,Internet已經(jīng)成為很多人生活不可缺少的一部分。當前Internet中流動的“比特”所代表的內(nèi)容已從原來的數(shù)據(jù)逐漸向?qū)崟r多媒體數(shù)據(jù)演變,它們的特點是對實時性要求非常高。但是,Internet是建立在TCP/IP之上的計算機網(wǎng)絡,最初設計時的定位決定了它不適合實時數(shù)據(jù)的傳輸。因此,1996年1月IETF音視頻傳輸工作頒布了針對實時應用的實時傳輸協(xié)議RTP/RTCP。RTP/RTCP使Internet從理論上具備了處理實時業(yè)務的能力,解決了媒
2、體同步問題和滿足了多媒體通信業(yè)務的要求,現(xiàn)在在IP電話、網(wǎng)絡多媒體會議、遠程網(wǎng)絡教學和遠程網(wǎng)絡診斷等領(lǐng)域都有著重大的應用。本文結(jié)合RTP/RTCP高實時性的特點,主要針對局域網(wǎng),提出了音頻數(shù)據(jù)采用G729a壓縮,傳輸數(shù)據(jù)采用ortp庫,在linux平臺下開發(fā)的實時語音通信系統(tǒng)。本文首先介紹了實時傳輸協(xié)議的簡單應用后,詳細分析了RTP/RTCP協(xié)議;接著介紹系統(tǒng)的具體實現(xiàn),主要分三個部分:音頻數(shù)據(jù)的采集和播放,音頻數(shù)據(jù)的解碼和編碼以及音頻數(shù)據(jù)包的發(fā)送和接收。最后簡單闡述了本系統(tǒng)在其他領(lǐng)域的可擴展性及前景。【關(guān)鍵詞】實時性,音頻傳輸,RTP/RTC
3、P,音頻壓縮IIAbstractWiththerapiddevelopmentofinformationsociety,theInternethasbecomeanindispensablepartofalotofpeoplelife.ThecurrentflowsthroughtheInternet"bits"representedbythecontentsofwhichhavebeengraduallyfromtheoriginaldatatoreal-timemultimediadata,thecharacteristicofthemis
4、veryhighdemandforreal-time.However,theInternetisbasedonTCP/IPcomputernetworks,theinitialdesignoflocationdeterminesitisnotsuitableforreal-timedatatransmission.Therefore,IETFaudioandvideotransmissionworkinJanuary1996issuedforreal-timeapplicationofreal-timetransmissionprotocolR
5、TP/RTCP.RTP/RTCPmakeInternettheoreticallywiththereal-timeabilityofthebusiness,themediasynchronizationproblemsandmeettherequirementsofthemultimediacommunicationservice,theIPtelephone,network,multimediaconference,remotenetworkteachingandremotediagnosis,etcallhaveimportantappli
6、cations.Inthispaper,combiningwiththecharacteristicsofRTP/RTCPhighreal-timeperformance,mainlyforlocalareanetwork(LAN),isputforwardusingG729aaudiodatacompression,datatransmissionusingortplibrary,developmentofreal-timevoicecommunicationsystemontheLinuxplatform.Thispaperfirstint
7、roducesthesimpleapplicationofreal-timetransportprotocol,RTP/RTCPprotocolareanalyzedindetail.Thenthispaperintroducestheimplementationofsystem,mainlydividedintothreeparts:audiodataacquisitionandplayback,audiodatadecodingandencodingandaudiopacketssentandreceived.Thelastsimplyex
8、poundsthesystemscalabilityandprospectsinotherareas.【Keywords】Realtimeaudiot