基于RTP的linux实时语音通信系统的设计与实现.doc
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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的要求,现在在IP
2、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AbstractWith the rapid development of infor
3、mation society, the Internet has become an indispensable part of a lot of people life.The current flows through the Internet bits represented by the contents of which have been gradually from the original data to real-time multimedia data, the characteristic of them is very high demand for real-time
4、.However, the Internet is based on TCP/IP computer networks, the initial design of location determines it is not suitable for real-time data transmission.Therefore, IETF audio and video transmission work in January 1996 issued for real-time application of real-time transmission protocol RTP/RTCP.RTP
5、/RTCP make Internet theoretically with the real-time ability of the business, the media synchronization problems and meet the requirements of the multimedia communication service, the IP telephone, network, multimedia conference, remote network teaching and remote diagnosis, etc all have important a
6、pplications.In this paper, combining with the characteristics of RTP/RTCP high real-time performance, mainly for local area network (LAN), is put forward using G729a audio data compression, data transmission using ortp library, development of real-time voice communication system on the Linux platfor
7、m.This paper first introduces the simple application of real-time transport protocol, RTP/RTCP protocol are analyzed in detail.Then this paper introduces the implementation of system, mainly divided into three parts: audio data acquisition and playback, audio data decoding and encoding and audio pac
8、kets sent and received.The last simply expounds the system scalability and prospects in other areas.【Keywords】 Real time audio transmission, RTP/RTCP, audio compressionII21嘉应学院毕业论文(设计)前 言随着多媒体网络的发展,RTP/RTCP在众多领域也得到了深入的应用,如VOIP电话、多媒体会议系统等应用的出现,也让语音传输通信技术也得到了迅速的发展。然而,语音通信需要的实时性是非常高的,而且数据量大。例如,一个多媒体会议系
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