Patent ID: 7664370
Filing Date: 2010-02-16
Classification: G11B,H04N

Abstract:
1. A reproduction apparatus for reproducing a digital stream generated by multiplexing a video stream and a graphics stream, comprising: a video decoder operable to decode the video stream to generate a moving picture; a graphics decoder; and a plane memory, wherein the graphics stream is a sequence of packets, the packets constituting the graphics stream include two types, one of which is packets containing graphics data and the other is packets containing control data, the sequence of packets includes a pair of a packet containing graphics data and a packet containing control data, the pair is followed by a packet containing control data that performs a forward reference, the control data that performs the forward reference indicates that graphics, which corresponds to the graphics data contained in the pair of packets which precedes the control data that performs the forward reference, is to be displayed, the graphics decoder includes: an object buffer; a processor operable to generate graphics on the object buffer by decoding the graphics data contained in the pair of packets; and a controller operable to execute a graphics display by writing the graphics generated on the object buffer into a partial area in the plane memory, based on the control data contained in the pair of packets, wherein the plane memory is a memory for overlay with moving pictures and is provided in the reproduction apparatus, and when control data that performs a forward reference has been read into the graphics decoder from a recording medium, the controller updates the graphics display by writing the graphics generated on the object buffer into the partial area again based on the read control data that performs the forward reference.