Design and implementation of a screen sharing system based on embedded platform

YANG Liang; DENG Chun-jian; SONG Xi-jia

doi:10.3788/YJYXS20142906.0933

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Design and implementation of a screen sharing system based on embedded platform

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- Design and implementation of a screen sharing system based on embedded platform
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 6, Pages: 933-938(2014)
- 作者机构：
  
  1. 电子科技大学中山学院计算机学院, 广东中山 528402
  2. 广东工业大学自动化学院, 广东广州 510006
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20142906.0933
  CLC： TP919.8
- Received：14 March 2014，
  
  Revised：01 May 2014，
  
  Published：05 December 2014
- 稿件说明：
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杨亮, 邓春健, 宋喜佳. 一种基于嵌入式平台屏幕内容分享系统的设计与实现[J]. 液晶与显示, 2014,29(6): 933-938

YANG Liang, DENG Chun-jian, SONG Xi-jia. Design and implementation of a screen sharing system based on embedded platform[J]. , 2014,29(6): 933-938
杨亮, 邓春健, 宋喜佳. 一种基于嵌入式平台屏幕内容分享系统的设计与实现[J]. 液晶与显示, 2014,29(6): 933-938 DOI： 10.3788/YJYXS20142906.0933.

YANG Liang, DENG Chun-jian, SONG Xi-jia. Design and implementation of a screen sharing system based on embedded platform[J]. , 2014,29(6): 933-938 DOI： 10.3788/YJYXS20142906.0933.

摘要

为了实现多种智能设备之间低带宽高画质的屏幕内容分享，设计了一种基于嵌入式平台大屏幕内容分享系统。该系统由跨平台客户端及基于嵌入式平台的服务器端两部分组成，针对传统屏幕内容分享系统占用带宽大、不适合分享高分辨率视频信息的缺点，提出了一种基于场景识别的码率自适应调整算法，该算法采用H.264编码方式，能够根据网络拥塞状况及当前屏幕的应用场景对H.264码率进行自适应调整，以达到节约带宽、提高画质的目的；另一方面，服务器端基于嵌入式平台，采用多线程并发设计，将视频的接收、解码、显示分线程独立处理，在提高程序的健壮性的同时降低了程序的耦合性。实验结果表明，该系统支持720 p高分辨率视频信息共享，具有成本低、占用带宽小、实时性高的优点。

Abstract

In order to share screen among intelligent devices with high quality and low band width

a screen sharing system based on embedded system has been designed and implemented

which consists of a cross-platform client and server. For the purpose of reducing bandwidth and improving screen quality

a self-adaptive method based on scene recognition is proposed

which could recognize the application scene intelligently and adjust H.264 code rate according to network congestion state and application context. On the other hand

the server has been deployed on embedded board. For the server side

a solution based on multiple threads has been proposed

which consists of main thread

message receiving thread

decode thread and display thread. Every thread focuses on their own task

which could improve the robustness and coupling dramatically. Experiment results show that the proposed screen sharing system could support screen sharing between PC and embedded display system with 720 p high resolution. And this solution has the advantages including real time

low-bandwidth and low cost.

关键词

Keywords

references

潘兆泰.交互式屏幕共享的低复杂度压缩和低延时传输方法[D].合肥:中国科学技术大学,2013. Pan Z T. Low-complexity compression and low-latency transmission for interactive screen sharing[D].Hefei:University of Science and Technology of China,2013.(in Chinese)[2] Scheifler R W,Gettys J. The X Window system[J].ACM Transactions on Graphics,1986,5(2):79-109.[3] Richardson T,Stafford-Fraser Q, Wood K R,et al.Virtual network computing[J].IEEE Internet Computing,1998, 2(1):33-38.[4] Schwarz H, Marpe D, Wiegand T. Overview of the scalable video coding extension of the H. 264/AVC standard[J].IEEE Transactions on Circuits and Systems for Video Technology,2007, 17(9): 1103-1120.[5] 祝世平, 张玲. 基于分形和 H. 264 的视频编码系统[J]. 光学精密工程, 2013, 21(3): 774-781. Zhu S P,Zhang L.Video coding system based on fractal and H.264[J].Optics and Precision Engineering,2013,21(3): 774-781.(in Chinese)[6] 吴银花, 金龙旭, 张柯. 应用 Jmode 值单调性的快速 P 帧模式选择算法[J]. 液晶与显示, 2013, 28(2): 266-272. Wu Y H,Jin L X,Zhang K.Fast P-frame mode decision algorithm using monotonicity of Jmode[J].Chinese Journal of Liquid Crystals and Displays,2013,28(2): 266-272.(in Chinese)[7] 刘艳青, 苏桂莲. 基于 Qt4 的图形用户界面程序的设计与实现[J]. 现代计算机: 下半月版, 2009(3): 170-172. Liu Y Q,Su G L.Design and implementation of graphical user interface program based on Qt4[J].Modern Computer,2009(3):170-172.(in Chinese)[8] 吴银花, 金龙旭, 张宁, 等. 针对 H. 264 改进的快速整像素运动估计算法[J]. 光学精密工程, 2013, 21(4):1017-1025. Wu Y H,Jin L X,Zhang N, et al.Improvement of fast integer pixel motion estimation algorithm for H.264[J].Optics and Precision Engineering,2013,21(4): 1017-1025.(in Chinese)[9] 李军杰. 基于 FFmpeg 的 H. 264 解码器在 Symbian 上的移植和优化[D].武汉:华中科技大学, 2011. Li J J.The implementation and optimization of symbian's H.264 decoder based on the FFmpeg[D].Wuhan:Huazhong University of Science & Technology,2011.(in Chinese)[10] Liu Y H, Wang S. An embedded multimedia player on S3C6410 platform[J]. Advanced Materials Research,2012, 571: 680-686.[11] Ni H B, Cao S X. Research and implementation of asynchronous video converter based on Linux[J].Applied Mechanics and Materials,2013, 241: 2596-2600.

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