基于Android的视讯终端

发布时间：2018-01-14 15:24

本文关键词：基于Android的视讯终端　出处：《吉林大学》2013年硕士论文　论文类型：学位论文

【摘要】：嵌入式系统的快速发展，使其逐渐开始取代原有工控机在应用领域的地位。相比传统工控机，嵌入式电子产品具有低功耗、体积小、成本更低的特点，且随着硬件工艺的快速发展，处理能力已经逐渐接近甚至超过一些传统工控机的水平。在人机交互界面领域，基于Android系统的嵌入式电子产品具有更好的亲和力和适应性。系统自身对互联网多种协议的支持使得产品已经可以适应各种网络通讯任务。使用Java编写的应用软件通用性强，功能强大，研发周期较短，为本文中介绍的视讯终端的研发提供了充足的条件。文章结合小区视讯终端为应用背景，主要提供了解决小区中信息公告、信息采集、用户视频交流等问题的方案，力求达到便民、快速、有效的特点。使用基于Android系统的平板电脑作为显示和输入设备，根据一个省级重点项目的需求，，详细介绍了一个小区视讯播报软件系统的总体架构，分析了实现该系统所需要的一些Java编码知识和用到的一些编解码算法。根据项目具体要求给出了实现所需功能的具体方案：在文本广播方面，介绍了在Android下使用UDP广播方式发送消息和显示消息的方法，另外简单介绍了使用Android中自带的SQLite数据库对过往信息的存储和查询；在文件广播方面，在分析传统传输协议的同时，提出了一种基于FTP协议的主动请求文件的文件广播方式；在音频传输方面，介绍了在Java下移植音频编解码库的方法；在视频通讯方面，介绍了使用硬编码方式获取视频信息的配置方式以及获取视频帧的方法，并基于UDP协议打包进行网络传输。分析了打包的原则和可能遇到的问题，给出了实现方案。最后将以上几个方面的内容用一个主应用界面结合，形成一个综合了以上所有功能的应用软件。文章中根据提出的解决方案设计了一套完整的视讯播报系统，包括平板电脑使用的视讯播报软件和上位机服务器使用的管理软件两部分内容，在数台基于Android系统的平板电脑上作了运行测试，测试效果良好，验证了系统的可行性。文章结尾提出了系统需要改进和继续研究发展的部分，为之后的研究做下了铺垫。
[Abstract]:With the rapid development of embedded system, it has gradually begun to replace the position of the original industrial control computer in the application field. Compared with the traditional industrial control computer, embedded electronic products have the characteristics of low power consumption, small size and lower cost. And with the rapid development of hardware technology, the processing capacity has gradually approached or even exceeded the level of some traditional industrial control computers, in the field of man-machine interface. Embedded electronic products based on Android system have better affinity and adaptability. The support of the system for various protocols of the Internet makes the products can already adapt to various network communication tasks. The application software written by va has strong generality. The function is powerful and the R & D cycle is short, which provides sufficient conditions for the R & D of video terminal introduced in this paper. Based on the application background of video terminal in residential area, this paper mainly provides a solution to the problems of information announcement, information collection, user video exchange and so on, in order to achieve convenience and speed. Effective features. Use a tablet based on Android system as display and input device, according to the requirements of a provincial key project. The overall architecture of a video broadcast software system in a residential area is introduced in detail. Some Java coding knowledge and some coding and decoding algorithms used in the system are analyzed. According to the specific requirements of the project, the specific scheme to realize the required function is given: in the aspect of text broadcasting. This paper introduces the method of sending and displaying messages using UDP broadcast under Android. In addition, it simply introduces how to store and query the past information by using the SQLite database in Android. In the aspect of file broadcasting, while analyzing the traditional transmission protocol, a file broadcasting method based on FTP protocol is proposed. In the aspect of audio transmission, the method of transplanting audio codec library under Java is introduced. In the aspect of video communication, this paper introduces the configuration method of obtaining video information by hard coding and the method of obtaining video frame. And based on the UDP protocol packaging for network transmission. The principle of packaging and possible problems are analyzed, and the implementation scheme is given. Finally, the contents of the above aspects are combined with a main application interface. Form an application software that integrates all of the above functions. According to the proposed solution, this paper designs a complete video broadcast system, which includes two parts: the video broadcast software used by the tablet computer and the management software used by the upper computer server. The test results are good and the feasibility of the system is verified. At the end of the paper, some parts of the system need to be improved and continue to research and development. For the next research made a foreshadowing.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TN929.5;TP368.1

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