Design And Implementation Of WFD Based Intelligent Multi Screen Interaction System

With the development of wireless Internet technology, people are eager topursue a variety of home network devices interconnection, digital media sharing andmulti-screen interactive experience. Household equipment may include one or morePC, smart phones, tablet PCs, smart TVs and home entertainment center, wirelessInternet technology, allowing users to fully experience the "family cloud" content.Convenient to access the content, pushed the content from one device to anotherdevice seamlessly, is the key requirements of the user’s experience. In order toachieve the user’s needs and solve interoperability issues of Digital Living NetworkAlliance service and quality problems of the content of WiFi Display, make usershave a better experience, this paper presents a new multi-screen interactive systemthat content streaming mode coexists display streaming mode, and two kinds ofseamless integration together to complete a series of home network of shareinformation and displaying work.First, this paper proposed system functional requirements and performancerequirements description detaily. According to the system requirements, and at thisstage multi-screen interactive technology development decisions, we use DLNAservice based on the UPnP protocol to implement content streaming model, usescreen based on the WFD display sharing to achieve flow pattern.Then, according to the requirements definition, the system is divided into threemodules, respectively, for the three modules of the design and implementation of adetailed description:(1) DMP player module based on DLNA service. DMP player uses UPnP AVArchitecture to implementation. When DMS server connection is established, phonesact as ControlPoint and MediaRender ask for media content to play to PC act asMediaServer. The architecture is divided into three steps: Invoke UPnP actions tobrowser and select content; Request the content for playback; Transport the contentto the DMP.(2) Screen sharing module based on WFD, after mobile terminal connected withTVs through the Wi-Fi Direct directly, the handheld screen sharing the projectorscreen to the TV side. Access to the mobile terminal screen images, compression,then encoding the compressed stream data using RTP/RTSP protocols encapsulatedinto network transport stream, stream via Wi-Fi network physical layer transmission.TV receives the restore stream audio and video stream data, then use the TV SOChardware decoder for real-time video or image decoding, restore screen projectionanimation. (3) Seamless integration of DLNA and WFD module. DLNA and WFDintegration, make them coexist in the multi screen interactive system. Automaticdecision-making is based on what kind of mode for data transmission and playbackaccording to the user’s operation.Finally, tested the system and analyzed the results. This system runs normally,The performance meet the design requirements.