| In recent years, the enhancement of intelligent terminal data processing capability and the increase of network bandwidth promote the growth of audio and video applications, which meet the needs of community users for audio and video interaction. On the other hand, audio and video interaction in the community is often confined to a fixed area, and the independent system increases the cost of user access. Metro audio and video interactive system highly integrated existing community of visual intercom system, video monitoring system, information release system and property management system, providing convenience for mobile phones in a wider range of access.Metro audio and video interactive system consists of two parts, service platforms and mobile terminal. This paper designs and implements the mobile terminal software for the interactive system of the metropolitan audio and video. Under the cooperation of the service platform, the software has completed a number of functions: Audio and video data processing; Communication between terminals; Information interaction with service platform; Multimedia information presentation.The main research contents of this paper include the following points:1. The design and implementation of access control response module. After the mobile terminal software is logged in, Mobile terminal check message, waiting for the control order from the server. Mobile terminal and server establish communication through a custom communication protocol, and then video and audio visual intercom by using the web Real-Time Communication technology. Mobile terminal software awake video intercom interface after receiving message from service platform, finally the user decide whether to open the door.2. The design and implementation of video monitoring module. Users in the community can only access to a specific area associated with them. The mobile terminal sends authentication messages to the server, then the server returns the list of IP camera via SOAP messages. The user can request the corresponding monitoring and service platform pushing video data. Terminal decodes video data and ensures images clearly to be shown.3. The design and implementation of multimedia information module. The mechanism of message pushing is established between the mobile terminal and service platform. The mobile terminal receive two types of messages sent by the server side: data-order message, play-list message. Data-order message of terminal, such as display size and network status, can provide the basis for the play-list template settings of the server; play-list message is used for terminal interface presentation. Server according to the selected play-list template and the material information generate play-list file, then terminal analysis the play-list file and render interface dynamically.It is proved that, the mobile terminal software, introduced in this paper, can well meet the needs of users in the community for the audio and video interaction on access control, security and multimedia information. |
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