本文選題：流媒體　切入點(diǎn)：DM3730　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：摘要：隨著移動通信技術(shù)和流媒體技術(shù)的快速發(fā)展,基于網(wǎng)絡(luò)來傳輸多媒體信息成為研究熱點(diǎn)。在現(xiàn)場報(bào)道,遠(yuǎn)距離的戶外直播活動中,經(jīng)常需要設(shè)備能滿足實(shí)時(shí)采集和傳輸視頻數(shù)據(jù)的要求。因此論文提出一種基于DM3730的無線數(shù)字電視視頻實(shí)時(shí)傳輸系統(tǒng)的解決方案,在便攜式、低功耗的嵌入式移動終端上實(shí)現(xiàn)視頻流媒體的實(shí)時(shí)采集和傳輸。 首先,在分析了無線視頻傳輸系統(tǒng)的功能需求以及要滿足數(shù)字電視的標(biāo)清標(biāo)準(zhǔn)后,論文設(shè)計(jì)了基于達(dá)芬奇技術(shù)的無線數(shù)字電視視頻實(shí)時(shí)傳輸系統(tǒng)。系統(tǒng)以TI公司的DM3730作為主要芯片,根據(jù)系統(tǒng)功能需求,完成基于DM3730核心板的外圍電路設(shè)計(jì),包括電源模塊、視頻采集模塊、存儲模塊、顯示模塊以及3G模塊。系統(tǒng)采用TI公司的CAM8000-A攝像頭作為視頻采集設(shè)備,它內(nèi)置的TVP5146解碼芯片將模擬視頻信號轉(zhuǎn)化成數(shù)字信號,使其滿足DM3730的輸入信號要求。然后,從應(yīng)用實(shí)際出發(fā),實(shí)現(xiàn)了3G上網(wǎng)卡驅(qū)動生成和撥號上網(wǎng),并且通過策略路由方法實(shí)現(xiàn)了多網(wǎng)卡綁定的方式來增加傳輸帶寬,這是論文的難點(diǎn)。接著采用多線程程序設(shè)計(jì)的思想,開發(fā)了視頻采集、編碼、傳輸?shù)膽?yīng)用程序：使用V4L2編程方式實(shí)現(xiàn)嵌入式Linux系統(tǒng)下的實(shí)時(shí)視頻采集；研究ARM+DSP雙核處理器的軟件開發(fā)方法,并利用達(dá)芬奇軟件技術(shù)對視頻數(shù)據(jù)使用H.264編碼算法進(jìn)行編碼；對編碼完成的數(shù)據(jù)采用RTP/RTCP流媒體傳輸協(xié)議進(jìn)行分片打包,通過3G無線網(wǎng)卡傳輸給接收端。系統(tǒng)測試結(jié)果表明,接收端接收到的視頻實(shí)時(shí)播放基本能滿足25幀/s的速率,畫質(zhì)滿足720*576的標(biāo)清標(biāo)準(zhǔn)。 通過研究表明,論文所設(shè)計(jì)的系統(tǒng)能現(xiàn)場采集視頻數(shù)據(jù)并通過無線網(wǎng)絡(luò)傳輸,遠(yuǎn)端接收視頻同時(shí)實(shí)時(shí)連續(xù)播放,滿足低延時(shí)、低功耗的要求。系統(tǒng)要是結(jié)合音頻數(shù)據(jù)一起處理的話將有更大的應(yīng)用空間。
[Abstract]:Absrtact: with the rapid development of mobile communication technology and streaming media technology, the transmission of multimedia information based on network has become a research hotspot. It is often needed that the equipment can meet the requirements of real-time video data acquisition and transmission. Therefore, this paper proposes a solution of wireless digital TV video real-time transmission system based on DM3730, which is portable, Video streaming media is collected and transmitted in real time on low power embedded mobile terminal. First of all, after analyzing the function requirement of wireless video transmission system and meeting the standard of digital TV, This paper designs a real-time video transmission system based on Da Vinci technology. The system uses TI's DM3730 as the main chip, and completes the peripheral circuit design based on DM3730 core board, including power supply module, according to the functional requirements of the system. Video acquisition module, storage module, display module and 3G module. The system uses TI's CAM8000-A camera as the video acquisition device, and its built-in TVP5146 decoding chip converts analog video signal into digital signal. It can meet the requirement of DM3730 input signal. Then, from the practical application, the 3G network card driver generation and dial-up network access are realized, and the multi-network card binding method is implemented by policy routing method to increase the transmission bandwidth. This is the difficulty of the thesis. Then, the application program of video acquisition, coding and transmission is developed with the idea of multi-thread programming. The real-time video acquisition under embedded Linux system is realized by using V4L2 programming method. This paper studies the software development method of ARM DSP dual-core processor, and uses Da Vinci software technology to encode video data using H.264 coding algorithm, and uses RTP/RTCP streaming media transmission protocol to package the encoded data. The system test results show that the real-time video broadcast can meet the speed of 25 frames / s and the picture quality can meet the standard of 720 / 576. The research shows that the system designed in this paper can collect video data and transmit it through wireless network. The remote receiving video can be played continuously in real time at the same time, which can satisfy the low delay. The requirement of low power consumption. If the system is processed with audio data, it will have more application space.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN949.197

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本文編號：1582691