The Design and Realization of Video Phone System in Embedded Platform

With the wide acceptance and development of the Internet, it is trend to integrate all of services and devices into Internet. At the same time, the fast development of communication technology that is evolved from narrowband dial-up networks to current broadband networks, from fixed PSTN phone to mobile phone and from wired network to wireless network. In the foreseeable future, the communication will be converged to IP centric networks to come up pervasive/ubiquitous network environments. In this paper, the functions of SIP protocol, video/audio codec, and video/audio streaming are integrated to realize a video/audio phone system in embedded platform. Based on the multi-thread environment, the modules of motion JPEG, SIP signaling protocol, and video/audio streaming are designed to come out a SIP-based video/audio streaming system. The system can be applied to the applications of remote surveillance, digital door phone, interphone, and Internet phone.