Multi-channel Audio And Video Monitoring System Of Mobile Terminal Based On Embedded Operating System

With the continuous development of Internet technology and video codec technology, networkvideo monitoring system has been widely used in the security industry. Meanwhile, in the context ofthe rapid development of smart mobile terminal, people have a higher security requirement: anytime, any where, any device. This makes video surveillance on the intelligent mobile terminal intoa new direction of application in the field of security.For the practical application, a multi-channel audio and video surveillance system of mobileterminal is designed and implemented based on embedded operating system. The system softwareconsists of an embedded server software and client software of mobile terminal. The server canimplement multi-channel audio and video capture, coding, wireless real-time transmission function,and the client can implement real-time monitoring, parameter control function. Make the systembetter meet people’s demand for audio and video surveillance of mobile terminal.Firstly, based on the analysis of audio and video surveillance system of mobile terminal’sspecific value, the paper focuses on the key technology such as Android software developmenttechnology, wireless technology, audio and video codec technology, pipe a communication.Designed the overall of the system, and given the server software and the Android softwaredevelopment platform to build process.Secondly, elaborated on the main building blocks of the system server software and clientsoftware and implementation. Server software consists of audio and video capture, encoding,wireless transmission and video parameters control modules, to achieve the function of capture,encoding, audio and video data transmission. The client software runs on mobile terminal ofAndroid system. It consists of audio-video receiving and analyzing, decoding, playback and display,video parameter setting modules, to achieve the function of remote audio and video reception andanalysis, decoding display and playback, video parameter settings. To meet the different mobileterminals, the system designed three video decoding method, comprising vfp+ffmpeg, neon+ffmpeg and stagefright hardware decoding.Finally, test the function of the system, and gives the local real-time video display image, videosurveillance of Android mobile terminal image, video parameter control and channel selectionimage, and decoding efficiency comparison table based on three decoding way under differentresolution. The test results show that the system implements audio and video monitoring of mobile terminal and parameter setting functions, and also achieves a switching function between differentvideo channels.