Design And Implementation Of Wi-Fi Display Based Multi-screen Interaction System

The paper discussed the design and implementation of Wi-Fi Display based multi-screen interactive system. Wi-Fi Display was proposed by Wi-Fi Alliance. Its purpose is to achieve wireless connectivity between smartphones and smart TVs or mobile PC, its good stability and maneuverability, widely recognized at home and abroad. Based on the research status of Wi-Fi Display technology, the paper designs and implements a multi-screen interactive system based on Wi-Fi Display platform. Smartphone without connecting any hardware cable, through its own Wi-Fi module, to transfer the phone information to the high-definition display screen, and presented with the mobile terminal synchronous playback. The main work of this paper are as follows:1. Design and implementation of Wi-Fi Direct module. Wi-Fi Display technology, based on the Wi-Fi Direct technology to achieve real-time sharing of data between the user equipment. In this paper, through Wi-Fi Direct technology, achieve data connection between smartphones(source) and Smart TV(sink). In the implementation of this module, the focus needs to solve the problem: INTERNET permission problems, determine the status of P2 P, ip address of sink, and so on;2. RTSP interaction module and data transfer. Before the source and sink transmission data stream, the paper implements session negotiation based on RTSP, resolution display, audio and video format. After the negotiation succeeds, access to audio and video stream of source, coding, packaged into a stream, transferred to the sink. After the sink to get audio and video streams, decode analysis, reduced to specific audio and video displayed on the screen. In the implementation of this module, the focus needs to solve the problem: the establishment RTSP channel, Message flow, audio and video streaming quality assurance process, and so on;3. Design and implementation of UIBC module. UIBC, namely User Input Back Channel. In general, users can only operate the source to control the playout sink, designed and implemented the UIBC function that allows users to operate sink by a mouse click, a touch click and other methods, reverse control source, to achieve multi-screen interactive features in the true sense. In the implementation of this module, the focus needs to solve the problem: the sink cross-ordinate access, Message flow, establishing UIBC channel, and so on;4. Functional testing. In the paper, the function has been tested in detailed, including screen sharing, photo sharing, audio and video sharing, UIBC functional testing.The system is stable and reliable after testing and verifying. Functions meet the demand.