基于DM3730的无线数字电视视频实时传输系统的研究

发布时间：2018-03-08 06:06

本文选题：流媒体　切入点：DM3730　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：随着移动通信技术和流媒体技术的快速发展,基于网络来传输多媒体信息成为研究热点。在现场报道,远距离的户外直播活动中,经常需要设备能满足实时采集和传输视频数据的要求。因此论文提出一种基于DM3730的无线数字电视视频实时传输系统的解决方案,在便携式、低功耗的嵌入式移动终端上实现视频流媒体的实时采集和传输。首先,在分析了无线视频传输系统的功能需求以及要满足数字电视的标清标准后,论文设计了基于达芬奇技术的无线数字电视视频实时传输系统。系统以TI公司的DM3730作为主要芯片,根据系统功能需求,完成基于DM3730核心板的外围电路设计,包括电源模块、视频采集模块、存储模块、显示模块以及3G模块。系统采用TI公司的CAM8000-A摄像头作为视频采集设备,它内置的TVP5146解码芯片将模拟视频信号转化成数字信号,使其满足DM3730的输入信号要求。然后,从应用实际出发,实现了3G上网卡驱动生成和拨号上网,并且通过策略路由方法实现了多网卡绑定的方式来增加传输带宽,这是论文的难点。接着采用多线程程序设计的思想,开发了视频采集、编码、传输的应用程序：使用V4L2编程方式实现嵌入式Linux系统下的实时视频采集；研究ARM+DSP双核处理器的软件开发方法,并利用达芬奇软件技术对视频数据使用H.264编码算法进行编码；对编码完成的数据采用RTP/RTCP流媒体传输协议进行分片打包,通过3G无线网卡传输给接收端。系统测试结果表明,接收端接收到的视频实时播放基本能满足25帧/s的速率,画质满足720*576的标清标准。通过研究表明,论文所设计的系统能现场采集视频数据并通过无线网络传输,远端接收视频同时实时连续播放,满足低延时、低功耗的要求。系统要是结合音频数据一起处理的话将有更大的应用空间。
[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.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN949.197

【参考文献】