Recording medium, reproduction apparatus, recording method, program, and reproduction method

A reproduction apparatus for reproducing a video stream and a graphics stream, said apparatus comprising:

• a graphics decoder operable to decode the graphics stream which represents an interactive display including a plurality of graphical buttons to be overlaid with a motion picture, and
• a graphics plane operable to store decompressed graphics data, wherein:
• the graphics stream includes a plurality of object definition segment sets and a control information which controls states of each of the plurality of graphical buttons, each having at least a normal state, a selected state and an active state;
• and
• the plurality of object definition segment sets comprise a first object definition segment set forming a group of graphics data for rendering the normal state of each of the plurality of graphical buttons, a second object definition segment set forming a group of graphics data for rendering the selected state of each of the plurality of graphical buttons, and a third object definition segment set forming a group of graphics data for rendering the active state of each of the plurality of graphical buttons;
• the first, second and third object definition segment sets are disposed in a sequential order of the first object definition segment set for rendering the normal state of each of the plurality of graphical buttons, the second object definition segment set for rendering the selected state of each of the plurality of graphical buttons, and the third object definition segment set for rendering the active state of each of the plurality of graphical buttons;
• the control information includes information indicating one of the graphical button materials as a default selected button to be displayed in the selected state at an initial display of the interactive display;
• the control information includes button information of the one of the graphical buttons indicated as the default selected button, the button information including an object identifier that specifies an object ID of an object to be displayed as the default selected button;
• and
• the graphics data for rendering the selected state for the default selected state button is disposed at a beginning of said second object definition segment set,
• said graphics decoder includes:
• a graphics processor operable to decode the graphics data;
• an object buffer operable to store decompressed graphics data obtained by the decoding;
• and
• a graphics controller operable to write the decompressed graphics data in the second object definition segment set to the graphics plane.

A recording method for recording to a recording medium, said method comprising:

• creating application data;
• and
• recording the created application data to the recording medium;
• wherein:
• the application data includes a graphics stream;
• the graphics stream represents an interactive display to be overlaid with a motion picture, the interactive display including a plurality of graphical buttons;
• the graphics stream includes a plurality of object definition segment sets and a control information which controls states of each of the graphical buttons, each having at least a normal state, a selected state and an active state;
• and
• the plurality of object definition segment sets comprise a first object definition segment set forming a group of graphics data for rendering the normal state of each of the plurality of graphical buttons, a second object definition segment set forming a group of graphics data for rendering the selected state of each of the plurality of graphical buttons, and a third object definition segment set forming a group of graphics data for rendering the active state of each of the plurality of graphical buttons;
• the first, second and third object definition segment sets are disposed in a sequential order of the first object definition segment set for rendering the normal state of each of the plurality of graphical buttons, the second object definition segment set for rendering the selected state of each of the plurality of graphical buttons, and the third object definition segment set for rendering the active state of each of the plurality of graphical buttons;
• the control information includes information indicating one of the graphical buttons as a default selected button to be displayed in the selected state at an initial display of the interactive display,
• said control information includes button information of the one of said graphical buttons indicated as the default selected button, the button information including an object identifier that specifies an object ID of an object to be displayed as the default selected button;
• and
• said graphics data for rendering the selected state for the default selected state button is disposed at a beginning of said second object definition segment set.

A program embodied on a computer readable medium for enabling a computer to reproduce a graphics stream, said program comprising code operable to cause the computer to perform:

• a decoding of the graphics stream;
• and
• a displaying of an interactive display to be overlaid with a motion picture, the interactive display including a plurality of graphical buttons;
• wherein:
• the graphics stream includes a plurality of object definition segment sets and control information which controls states of each of the graphical buttons, each having at least a normal state, a selected state and an active state;
• the plurality of object definition segment sets comprise a first object definition segment set forming a group of graphics data for rendering the normal state of each of the plurality of graphical buttons, a second object definition segment set forming a group of graphics data for rendering the selected state of each of the plurality of graphical buttons, and a third object definition segment set forming a group of graphics data for rendering the active state of each of the plurality of graphical buttons;
• the first, second and third object definition segment sets are disposed in a sequential order of the first object definition segment set for rendering the normal state of each of the plurality of graphical buttons, the second object definition segment set for rendering the selected state of each of the plurality of graphical buttons, and the third object definition segment set for rendering the active state of each of the plurality of graphical buttons;
• the control information includes information indicating one of the graphical buttons as a default selected button to be displayed in the selected state at an initial display of the interactive display;
• said control information includes button information of the one of said graphical buttons indicated as the default selected button, the button information including an object identifier that specifies an object ID of an object to be displayed as the default selected button;
• and
• said graphics data for rendering the selected state for the default selected state button is disposed at a beginning of said second object definition segment set;
• and
• the computer includes:
• a graphics processor operable to decode the graphics data;
• an object buffer operable to store decompressed graphics data obtained by the decoding;
• and
• a graphics plane operable to store at least some of the decompressed graphics data that are to be overlaid with the motion picture;
• and
• wherein the decompressed graphics data in the second object definition segment set is written to the graphics plane.

A method of reproducing a graphics stream which represents an interactive display including a plurality of graphical buttons to be overlaid with a motion picture, said reproduction method comprising:

• decoding the graphics stream, wherein:
• the graphics stream includes a plurality of object definition segment sets and control information which controls states of each of the graphical buttons, each having at least a normal state, a selected state and an active state;
• and
• the plurality of object definition segment sets comprise a first object definition segment set forming a group of graphics data for rendering the normal state of each of the plurality of graphical buttons, a second object definition segment set forming a group of graphics data for rendering the selected state of each of the plurality of graphical buttons, and a third object definition segment set forming a group of graphic data for rendering the active state of each of the plurality of graphical buttons;
• the first, second and third object definition segment sets are disposed in a sequential order of the first object definition segment set for rendering the normal state of each of the plurality of graphical buttons, the second object definition segment set for rendering the selected state of each of the plurality of graphical buttons, and the third object definition segment set for rendering the active state of each of the plurality of graphical buttons;
• the control information includes information indicating one of the graphical buttons as a default selected button to be displayed in the selected state at an initial display of the interactive display;
• the control information includes button information of the one of said graphical buttons indicated as the default selected button, the button information including an object identifier that specifies an object ID of an object to be displayed as the default selected button;
• and
• the graphics data for rendering the selected state for the default selected state button is disposed at a beginning of said second object definition segment set;
• and
• said decoding includes:
• decoding the graphics data;
• storing decompressed graphics data obtained by the decoding onto an object buffer;
• storing at least some of the decompressed graphics data that are to be overlaid with the motion picture onto a graphics plane;
• and
• writing the decompressed graphics data in the second object definition segment set to the graphics plane.