Recording medium, reporduction apparatus, recording method, integrated circuit, program and reporduction method

A reproduction apparatus for a digital stream that is obtained by multiplexing a video stream and a graphics stream, the graphics stream being a packet sequence that includes a data packet storing graphics data and a control packet storing control information, the reproduction apparatus comprising:

• a video decoder operable to obtain a moving picture by decoding the video stream;
• and
• a graphics decoder including:
• a processor that starts decoding of graphics data when a current reproduction point of the video stream reaches a point shown by a decode time stamp of the data packet, and ends the decoding when the current reproduction point reaches a point shown by a presentation time stamp of the data packet;
• and
• a controller that, according to a presentation time stamp of the control packet, combines, with a video stream, the graphics data after the decoding, and displays the graphics data combined with the video stream.

A recording method for a recording medium, the recording method comprising:

• a step of creating application data;
• and
• a step of recording the created application data to the recording medium, wherein
• the application data includes a digital stream that is obtained by multiplexing a graphics stream and a video stream, the graphics stream being a packet sequence that includes a data packet storing graphics data and a control packet storing control information,
• the data packet has a time stamp whose value indicates a decoding time of the graphics data, and
• the control packet has a time stamp whose value indicates a time at which the graphics data, after being decoded, is displayed combined with the video stream.

An integrated circuit used in a reproduction apparatus for a digital stream, the digital stream being obtained by multiplexing a video stream and a graphics stream, the graphics stream being a packet sequence that includes a data packet storing graphics data and a control packet storing control information, the integrated circuit comprising:

• a video decoder operable to obtain a moving picture by decoding the video stream;
• and
• a graphics decoder including:
• a processor that starts decoding of graphics data when a current reproduction point of the video stream reaches a point shown by a decode time stamp of the data packet, and ends the decoding when the current reproduction point reaches a point shown by a presentation time stamp of the data packet;
• and
• a controller that, according to a presentation time stamp of the control packet, displays the graphics data, after being decoded, combined with the video stream.

A program that makes a computer perform reproduction of a digital stream, the digital stream being obtained by multiplexing a video stream and a graphics stream, the graphics stream being a packet sequence that includes a data packet storing graphics data and a control packet storing control information, the program comprising:

• a code that makes the computer obtain a moving picture by decoding the video stream;
• and
• a code that makes the computer perform graphics rendering by which the graphics data combined with the moving picture is displayed, the graphics rendering performed by the computer including:
• a process of starting decoding of graphics data when a current reproduction point of the video stream reaches a point shown by a decode time stamp of the data packet, and ending the decoding when the current reproduction point reaches a point shown by a presentation time stamp of the data packet;
• and
• a process of, according to a presentation time stamp of the control packet, displays the graphics data, after being decoded, combined with the video stream.

A reproduction method for a digital stream that is obtained by multiplexing a video stream and a graphics stream, the reproduction method comprising:

• a process of obtaining a moving picture by decoding the video stream;
• and
• a process of performing graphics rendering by which the graphics data combined with the moving picture is displayed, the graphics rendering including:
• a process of starting decoding of graphics data when a current reproduction point of the video stream reaches a point shown by a decode time stamp of the data packet, and ending the decoding when the current reproduction point reaches a point shown by a presentation time stamp of the data packet;
• and
• a process of, according to a presentation time stamp of the control packet, displays the graphics data, after being decoded, combined with the video stream.