Research On Screen Sharing Control System Based On Android

For the problem in multi-screen interactive real-time multimedia transmission,this article describes three kinds of currently existing real-time multimedia transmission scheme,and compare these programs. By comparing the advantages and disadvantages of these programs, designed a scheme which based on the Android system and use WiFi Display standard real-time multimedia transmission.This article adopts the WiFi Direct as transport programme,So the devices can complete point-to-point high-speed transmission do not rely on AP.In the Android system,using the latest WiFi Display standard for multimedia real-time transmission,that need to use the TCP protocol for communication between the parameters of transmission equipment before transmission,then send the data by the UDP protocol after decide the parameters.The system includes Source device(Send device) and Sink device(Receive device).Source device’s main functions includes:to search and find Sink device;establish a connection with Sink device by WiFi Direct;via TCP to obtain screen display parameters of the Sink device;capture the video from the Source device and compress it in H.264 standard;send the video data by UDP protocol.Sink device’s main functions includes:to accept connection requests of WiFi Direct from Source device and establish the connection with the Source device; to obtain the transmit data parameters from the Source device by TCP;receiving the transmission with the data of Source device and output on a display device.In summary, the main work and innovations are as follows:1)This article adopted the WiFi Direct for point to point transmission.the traditional methods of data transmission include Bluetooth and WiFi,Bluetooth can make point to point transmission but that is relatively slow,The transmission speed of WiFi is faster but need AP access,the use of convenience is not as good as bluetooth.WiFi Direct obtains the double advantages of point to point transmission of Bluetooth and WiFi speed.2)Using WiFi Display as a standard of video transmission,when the traditional DLNA standard to share the data that need more time to push.The user experience relative is not very good, but WiFi Display can make multimedia sharing no longer need more time.Finally,to make the comprehensive test for Source device and Sink device.to record the problem encountered during testing and corresponding solutions,then analysis these problems to get the conclusion.The test shows that the screen sharing system can broadcast the video from Android mobile phone in real-time and share to the display device.