tive Transports: Delivering Media to the Desktop
Andrew Thomas Campbell, Geoff Coulson · 1997
By trading off temporal and spatial quality with available bandwidth, or manipulating the pla out time of continuous media in response to variation in delay, audio mal perceptual distortion. In this artic e the authors describe the implementation of an adaptive transport system that incorporates a QoS-oriented API and a range of mechanisms that best assist multimedia applications in adapting to fluctuations in the delivered network QoS. The system, which is an instantiation of the transport and network layers of a architecture, is implemented in a multi-ATM switch network environment with Linux-based PC end systems and continuous media file servers. A performance evaluation of the system configured to support a video-ondemand application scenario is presented and discussed. A novel as ect of the system is the implementation of a QoS adaptation algorithm which al P ows applications to delegate to the transport system responsibility for augmenting or reducing the perceptual quality of video and audio flows when network resource availability increases or decreases, respectively. P and video Y lows can be made to ada t to fluctuating network conditions with mini