Abstract
With the development of high bandwidth wireless technology, video codec improvement, SoC process upgrade and performance increase, portable device has become more powerful in computation with multipurpose in application today. Many applications can be executed in portable device, and do a lot of real time streaming service, such as "Video Conference", "IP TV", and "Remote Surveillance". Many streaming applications executed on desktop computer with wired network in the past, it is limited in portability, mobility and cost. The above problems can be solved by using wireless embedded platform and software design. Therefore, it provides the user to enjoy streaming services anywhere. The focus of this research is system prototyping for dual-core portable device to construct video streaming system in wireless environment. This system prototyping of streaming system consists of video streaming subsystem, video decoding subsystem and mobility subsystem. We will discuss the design and implementation of each subsystem and interface between subsystems in detail. Video streaming subsystem is mainly used to transmit and receive pre-recorded video or live event through “Real-Time Transport Protocol”, which adopts the newest video compression standard called “H.264/AVC”. Video decoding subsystem is mainly used to decode compressed video data through H.264/AVC decoder on dual-core platform. Mobility subsystem is mainly used to support mobility through “Session Initiation Protocol”, and this subsystem keeps ongoing video streaming despite handoff. By using three subsystems and its component-based design will achieve the maximum utilization of dual-core application platform which consists of MPU and DSP. The platform provides high computation power and low power consumption to enable richer multimedia capabilities in portable device. Finally, we will not only implement and explain the overall system prototyping design between subsystems but also discuss the related problems and solutions in video transmission and video quality, such as loss detection and concealment techniques.