| With the rapid development of China's economy in recent years,China has entered an aging society.The traditional high-cost and low-efficiency old-age care methods have not met the needs of the elderly.This paper designs and implements a mobile client software for the elderly escort system with real-time video call,distress alarm,voice group chat,family circle and other escort functions.The main achievements of this paper include:(1)The audio and video transmission module on the Android device is designed and implemented.The SIP protocol is used to control the entire session process.After collecting data,H.264 is used to encode the video image,and G.711 encodes the audio.The encoded data is encapsulated into RTP packets and sent by UDP,and decoded and played at the receiving end.At the same time taking into account the performance bottleneck of the mobile phone CPU,the paper uses MediaCodec hard codec to replace the traditional FFmpeg soft codec,so as to achieve a smooth and stable audio and video experience.After testing,the scheme meets the design requirements.(2)The family circle module and alarm module is designed and implemented.The mobile terminal scans the smart person's two-dimensional code to establish a correspondence relationship.The old device is the center,and all users who are bound to the same old device join the same community,and do not need the elderly to do any operation.The user's registration login is implemented by SIP and HTTP,and the heartbeat packet mechanism of SIP signaling is sent every 20 s to implement a long connection with the server.The children pay attention to the living of the elderly through the family circle module.In terms of safety,the wristband sensing alarm method is adopted.After the alarm information is forwarded to the mobile terminal by the server,the child is reminded by sound,vibration and graphic flashing,so as to timely feedback on the danger of the elderly.After testing,the scheme meets the design requirements. |
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