Playback device, playback method, recording medium, recording device, recording method to record a video and graphics stream with window information on graphics display

摘要

A reproduction apparatus comprising: a reading unit operable to read, from a recording medium (100), a flow of graphics that includes a plurality of Epochs, each epoch including a plurality of Display Sets, wherein one of the Display Sets includes graphics data (ODS), window definition information (WDS) and control data (PCS); a processor (12, 14) operable to decode the graphics data (ODS); an object buffer (15) operable to store decoded graphics data; a plan memory (8); and a controller (17), wherein the window definition information (WDS) indicates a width, height and position of a rectangular area in the plane memory (8), the window definition information (WDS) is set during a Time, the control data (PCS) includes information indicating a type of one of the Display Sets, the controller (17) is operable, when the rectangular area is a part of the plane memory (8) , to model the decoded graphics data that is stored in the object buffer (15) inside the rectangular area and not to model the decoded graphics data outside the rectangular area, the graphics flow includes a PTS [ WDS] that indicates an execution start time to model the graph data in the rectangular area, and a PTS [PCS] that indicates an execution time to model the graph data in the plane memory (8) , the transfer rate between the object buffer (15) and the plane memory (8) is 256 Mbps and the accuracy of said PTS is 90000 Hz, and the PTS [WDS] indicating the start time of Execution is represented by: PTS [WDS] = PTS [PCS] - 90000 x SIZE [WDS. WIN] / 256000000, in which SIZE [WDS. WIN] is a total window size that derives from the window definition information (WDS).