【摘要】：自20世紀(jì)60年代起人們就開始研究視頻通信技術(shù),由于當(dāng)時各種技術(shù)都不成熟,加之市場需求不強(qiáng),視頻通信類應(yīng)用沒有流行起來。借助網(wǎng)絡(luò)環(huán)境的改善和計(jì)算機(jī)技術(shù)的發(fā)展,各種音視頻類通信應(yīng)用讓越來越多的人開始通過互聯(lián)網(wǎng)享受到通信的便利,各種即時通訊工具已經(jīng)成為人們?nèi)粘贤ú豢扇鄙俚囊徊糠�。近年�?信息交流的載體不再僅僅局限于文字,圖像、音視頻等載體開始流行。實(shí)時視頻通信技術(shù)逐漸被提上了研究和應(yīng)用日程。隨著移動終端硬件能力的增強(qiáng)和3G/4G網(wǎng)絡(luò)的普及,在移動終端進(jìn)行實(shí)時視頻通信無論在技術(shù)上還是市場上都變的可行,并逐漸受到了越來越多人的關(guān)注。 然而實(shí)時視頻通信系統(tǒng)的開發(fā)需要處理各種各樣的復(fù)雜問題,個人開發(fā)者和小公司沒有相應(yīng)的技術(shù)積累和資金支持,阻礙了實(shí)時視頻通信類應(yīng)用的發(fā)展。直到Html5WebRTC技術(shù)的出現(xiàn),WebRTC包含了視頻通信的核心技術(shù),能夠通過調(diào)用Javascript API的方式實(shí)現(xiàn)瀏覽器之間的視頻通信。WebRTC不僅提供了視頻通信音視頻采集、編解碼、網(wǎng)絡(luò)傳輸?shù)裙δ?而且作為Html5標(biāo)準(zhǔn),可以跨平臺,做到了“一次編寫,到處運(yùn)行”,大大節(jié)省了開發(fā)和維護(hù)的成本。 基于以上背景,本文研究了WebRTC音頻引擎模塊、視頻引擎模塊以及網(wǎng)絡(luò)傳輸模塊,并在此基礎(chǔ)上初步設(shè)計(jì)了基于WebRTC技術(shù)的實(shí)時視頻通信系統(tǒng),實(shí)現(xiàn)了移動終端和電腦瀏覽器間的一對一視頻通信和一對多視頻通信。最后,運(yùn)行結(jié)果表明該系統(tǒng)語音通話良好,視頻畫面清晰流暢。本文所做的工作,應(yīng)當(dāng)可以為后續(xù)相關(guān)研究提供參考。
[Abstract]:Since the 1960s, people began to study the video communication technology. At that time, all kinds of technologies were immature and the market demand was not strong, so the video communication applications did not become popular. With the improvement of network environment and the development of computer technology, more and more people begin to enjoy the convenience of communication through the Internet. All kinds of instant messaging tools have become an indispensable part of people's daily communication. In recent years, the carriers of information exchange are no longer limited to words, images, audio and video carriers and so on. Real-time video communication technology has been put on the research and application agenda. With the enhancement of the hardware capability of mobile terminal and the popularization of 3G/4G network, real-time video communication in mobile terminal becomes feasible in both technology and market, and has been paid more and more attention. However, the development of real-time video communication system needs to deal with a variety of complex issues, personal developers and small companies do not have the corresponding technology accumulation and financial support, which hinders the development of real-time video communication applications. Until the emergence of Html5WebRTC technology, WebRTC includes the core technology of video communication, which can realize the video communication between browsers by calling Javascript API. WebRTC not only provides the functions of video communication, audio and video acquisition, coding and decoding, network transmission, etc. And as a Html5 standard, it can cross platform, can be "write once, run everywhere", greatly saving the cost of development and maintenance. Based on the above background, this paper studies the WebRTC audio engine module, video engine module and network transmission module. On this basis, a real-time video communication system based on WebRTC technology is preliminarily designed. One-to-one video communication and one-to-many video communication between mobile terminal and computer browser are realized. Finally, the running results show that the system has good voice communication and clear and smooth video picture. The work done in this paper should provide a reference for the follow-up research.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5;TP311.52

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