Journal of Systems and Software - Special issue: Adaptive multimedia computing
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In this paper, we propose a mechanism of an adaptive multimedia stream service that can support continuous data transmissions in mobile computing environment. This mechanism contains an effective buffering method, an intelligent filtering and QoS negotiation method, and a playout control method to provide seamless playback of multimedia streams. To implement the mechanisms in the mobile computing environment, we take the concept of proxy. It is located in the intermediate place between two communication endpoints and it plays the role of an agent of the mobile hosts. The proxy uses the buffering method to keep constant transmission rates using feedback so that it can provide an adaptive stream service to the network. If needed, the proxy may transform the streams by applying filters to make mobile hosts' environments more optimal. And it does QoS negotiation with mobile hosts if the network bandwidth cannot support required QoS or if the environment of mobile host was changed.