Modular Design And Implementation Of Emergency Command And Dispatch Software Based On Android

The popularity of mobile devices to the development of many industries to speed up the pace,the function of software for mobile devices based on the software to emerge in an endless stream,people's life has brought great convenience,communication distance limit breakthrough let dispatching has been developed greatly.This article designs and implements an Android-based emergency command and dispatch software that enables long-distance many-to-one video browsing,multi-person voice calls,point-to-point voice calls,mail and software updates and so on,each function is modularly designed and is easy to use and manage.The whole software uses the network for the transmission carrier,frees the communication distance.This article firstly introduces all the key of technologies involved in this emergency command and control software,including Android system framework and the development of technology,audio and video coding technology,real-time transmission protocol and other technologies.Secondly,introduces the demand analysis and feasibility analysis of the emergency command and dispatch software are carried out.According to the requirement,the overall framework of the system is designed.On this basis,introduces the SIP signaling interaction process of each function module and the interaction process between the modules.In the aspect of Audio,Android client using AudioRecord and AudioTrack for voice acquisition and playback,through MediaCodec audio hard-coding decoding,access to third-party Jlibrtp library for RTP audio data transmission.In the aspect of Video,through the Android device camera capture callback video original yuv data,using the MediaCodec hard-coded H.264 format,and then uses a third party Jlibrtp library to achieve RTP video data transmission,when the video receiver receives the video rtp packet frames,using MediaCodec hardware decoding and playing the picture.Chat mail,realized by the combination of Sip,XML and FTP to make the text and other information transmission.Finally,this article also optimizes the memory usage of the software,and tests the stability and effectiveness of the software thoroughly.The result shows that the software can run stably and achieve the expected result.