A QoS adaptive transport system
Andrew Thomas Campbell, Geoff Coulson · 1996
Distributed audio and video applications need to adapt to fluctuations in delivered quality of service (QoS).By trading off temporal and spatial quality to available bandwidth, or manipulating the playout time of continuous media in response to variation in delay, audio and video flows can be made to adapt to fluctuating QoS with minimal perceptual distortion.In this paper we describe the implementation of a QoS adaptive transport system that incorporates a QoS oriented API and a range of mechanisms to assist applications in exploiting QoS and adapting to fluctuations in QoS.The system, which is an instantiation of the QoS Architecture (QoS-A), 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 Video-on-Demand application scenario is presented and discussed.'ACM Multimcdia 96, Boston MA USA