The object priority order compositor for MPEG-4 player

摘要

PURPOSE: An object priority compositor of an MPEG-4 player is provided to dynamically change order of objects by searching object priorities, and to present objects only to be reconfigured, thereby implementing efficient usage of multimedia data and supplying dynamic scenes to users. CONSTITUTION: A drawing node list generator receives a scene tree from a parser manager, firstly searches drawing nodes necessary when being substantially presented on a screen from the scene tree, and prepares a list. An object priority manager processes insertion, deletion, change commands received from scene configuration information, and gives priorities to objects. The drawing node list generator consists of an object priority register, a drawing node extractor, and a field-node extractor. The object priority register sequentially registers drawing priorities in a head list of a drawing node list. The drawing node extractor is handed over with a route node of the scene tree from the parser manager, searches the scene tree, and extracts a drawing node. The field-node extractor extracts a field-node only, and registers the field-node in a sub list of the drawing node list.