Playback device, playback method, recording medium, recording device, recording method to record a video stream and graphics with window information that remains fixed for a time

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 graph data (ODS), control data (PCS) and window definition information (WDS); 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 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) in the inside the rectangular area and in order 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 graphic data in the rectangular area, and a PTS [PCS] indicating an end-of-execution time to model the graphics data in the plane memory (8), the transfer rate between the object buffer (15) and the plane memory (8) is of 2 56 Mbps and the accuracy of said PTS is 90000 Hz, the PTS [WDS] that indicates the execution start time 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), the window definition information (WDS) is set during a Time, and the Time is defined as a period from memory erase from plane (8) until the memory of plane memory (8) is cleared again.