SYNCHRONIZATION REPRESENTATION AND TRAFFIC SOURCE MODELING IN ORCHESTRATED PRESENTATION

Multimedia applications comprise several media streams, which are sema ntically synchronized at different time instants, The application beha vior is stored along with the multimedia database using representation mechanisms such as OCPN (object composition Petri nets) or dynamic ti med Petri nets (DTPN). It is imperative that one translates the applic ation behavior to the corresponding schedulable entities, such as pack ets, so that the performance engineering of any system can be done, us ing the traffic model arising out of the (media related) application b ehavior as opposed to individual media level behavior, This requires t hat a function be defined, which takes the stored temporal representat ion as input and produces packets as output, preserving the semantic r elationships among the streams. We propose a methodology based on prob abilistic, attributed context free grammar (PACFG) to address this iss ue, We demonstrate the appropriateness of this methodology by applying it to the OCPN/DTPN representation of a typical multimedia applicatio n vis-a-vis orchestrated presentation.