【摘要】：隨著嵌入式技術(shù)的不斷發(fā)展以及無線快速數(shù)據(jù)通信需求的逐步增長,音視頻等多媒體應(yīng)用的發(fā)展也越來越受到人們的重視。人們迫切需要一種費(fèi)用低廉且高質(zhì)量的音視頻實(shí)時(shí)通信產(chǎn)品,因此,音視頻多媒體的開發(fā)具有廣闊的發(fā)展空間。嵌入式處理器結(jié)構(gòu)的不斷發(fā)展和改進(jìn)也為多媒體應(yīng)用的開發(fā)提供了硬件基礎(chǔ)。其中比較典型的有TI公司基于ARM+DSP異構(gòu)雙核架構(gòu)的DM3730處理器,它是專門針對嵌入式系統(tǒng)設(shè)計(jì)的開放多媒體應(yīng)用處理器,足以滿足現(xiàn)階段的多媒體通信的需要。而在操作系統(tǒng)方面,采用微內(nèi)核架構(gòu)的QNX實(shí)時(shí)操作系統(tǒng)在嵌入式系統(tǒng)終端領(lǐng)域逐步發(fā)展,以其實(shí)時(shí)性、安全性和可靠性等特點(diǎn)在通信領(lǐng)域占據(jù)一席之地。 VoIP技術(shù)由于其經(jīng)濟(jì)、靈活、功能豐富等優(yōu)點(diǎn)越來越廣泛地應(yīng)用,而其與無線技術(shù)結(jié)合產(chǎn)生的無線VoIP通信技術(shù)是其最重要的發(fā)展趨勢之一。經(jīng)過對現(xiàn)有的無線VoIP通信領(lǐng)域相關(guān)技術(shù)的研究,本文針對實(shí)際情況開展了基于ARM+DSP異構(gòu)雙核平臺(tái)下的音視頻實(shí)時(shí)通信系統(tǒng)的研究與設(shè)計(jì)。在本系統(tǒng)設(shè)計(jì)中,采用了模塊化的設(shè)計(jì)思想,完成了達(dá)芬奇子系統(tǒng)軟件模塊、SIP信令控制模塊和無線網(wǎng)絡(luò)傳輸模塊等主要部分組成。該系統(tǒng)可以極大地提高消費(fèi)者對于嵌入式音視頻實(shí)時(shí)通信的體驗(yàn)。 本論文通過深入分析ARM+DSP異構(gòu)雙核處理器架構(gòu)及其軟件開發(fā)模式,并結(jié)合VoIP音視頻多媒體通信技術(shù)進(jìn)行系統(tǒng)設(shè)計(jì)。系統(tǒng)首先完成了整個(gè)系統(tǒng)的方案論證,確定各個(gè)部分的技術(shù)要點(diǎn),然后根據(jù)ARM+DSP異構(gòu)雙核處理器的硬件特點(diǎn),選定達(dá)芬奇軟件框架進(jìn)行異構(gòu)雙核系統(tǒng)應(yīng)用程序的開發(fā)。依據(jù)達(dá)芬奇軟件框架設(shè)計(jì)的原則和規(guī)范,實(shí)現(xiàn)了從底層語音和視頻算法庫的xDM標(biāo)準(zhǔn)封裝到上層音視頻實(shí)時(shí)通信應(yīng)用程序的開發(fā)。將采用微內(nèi)核架構(gòu)的QNX嵌入式實(shí)時(shí)操作系統(tǒng)作為ARM核上的操作系統(tǒng),通過跨平臺(tái)的QT界面設(shè)計(jì)軟件完成嵌入式終端操作界面的設(shè)計(jì),實(shí)現(xiàn)了系統(tǒng)通信的控制和音視頻播放,人機(jī)交互界面簡潔友好。最后,搭建了OpenSIPS服務(wù)器并完成了終端上的SIP和RTP協(xié)議功能。通過對各個(gè)模塊的功能和性能進(jìn)行測試,結(jié)果顯示整個(gè)系統(tǒng)運(yùn)行良好,達(dá)到了當(dāng)初論文設(shè)計(jì)的初衷,最終可以通過本系統(tǒng)進(jìn)行音視頻通信。
[Abstract]:With the development of embedded technology and the increasing demand of wireless fast data communication, people pay more and more attention to the development of multimedia applications such as audio and video. People urgently need a kind of low cost and high quality audio and video real-time communication product, so the development of audio and video multimedia has a broad development space. The continuous development and improvement of embedded processor architecture also provides the hardware basis for the development of multimedia applications. The typical DM3730 processor based on ARM DSP heterogeneous dual-core architecture in TI is an open multimedia application processor designed for embedded system, which can meet the needs of multimedia communication at this stage. In the aspect of operating system, the QNX real-time operating system based on microkernel has been developed gradually in the field of embedded system terminal. The characteristics of security and reliability occupy a place in the field of communication. VoIP technology is more and more widely used because of its advantages of economy, flexibility, rich functions, etc. The wireless VoIP communication technology combined with wireless technology is one of the most important development trends. Through the research of the existing wireless VoIP communication technology, this paper develops the research and design of the audio and video real-time communication system based on the ARM DSP heterogeneous dual-core platform. In the design of the system, the modular design idea is adopted, and the main components of the software module of da Vinci subsystem, SIP signaling control module and wireless network transmission module, are completed. This system can greatly improve the consumer's experience of embedded audio and video real-time communication. In this paper, the architecture of ARM DSP heterogeneous dual-core processor and its software development mode are deeply analyzed, and the system is designed based on VoIP audio and video multimedia communication technology. The system has completed the scheme demonstration of the whole system and determined the technical key points of each part. Then according to the hardware characteristics of the ARM DSP heterogeneous dual-core processor, Leonardo da Vinci software framework has been selected to develop the application program of the heterogeneous dual-core system. According to the design principles and specifications of Leonardo da Vinci software framework, the development of real-time audio and video communication application program from the xDM standard of the underlying voice and video algorithm library to the upper layer audio and video real-time communication program is realized. The embedded real-time operating system (QNX) with microkernel architecture is used as the operating system on the ARM core. The embedded terminal operation interface is designed by the cross-platform QT interface design software, which realizes the control of system communication and audio and video playback. The man-machine interface is simple and friendly. Finally, the OpenSIPS server is built and the functions of SIP and RTP on the terminal are completed. By testing the function and performance of each module, the result shows that the whole system is running well, which reaches the original intention of the paper, and finally can communicate audio and video through this system.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TP332;TN919.8

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本文編號：2229641