Information recording medium wherein stream convertible at high-speed is recorded, and recording apparatus and recording method therefor

Abstract

An information recording medium capable of converting a stream including seamless connection, which is recorded in a constrained format allowing format conversion, from a first format (MPEG-TS) to a second format (MPEG-PS), into a second stream, and an apparatus and method for recording information in the information recording medium. The constrained format is provided for enabling conversion from a first format (for example, MPEG transport stream) to a second format (for example, MPEG program stream). According to the constrained format, when the connection information of the playback portion indicates a seamless playback, the system stream immediately before a seamless connection point ends with a complete data management unit (Capsule).

1 . A non-transitory information recording medium having stored thereon a data structure for storing video information and audio information which are encoded into a system stream, together with associated management information, wherein, in the data structure:
 the system stream is allowed to have a first format (TS), the first format (TS) having a packet structure for storing data segmented in packets,   the first format (TS) is allowed to have a constrained format used for converting the system stream from the first format (TS) to a second format (PS), the second format (PS) having a pack structure for storing data segmented in packs;   with the constrained format, a predetermined number of packets are grouped and managed as a multiplexing unit, which corresponds to the pack of the second format (PS), and the system stream is managed in a data management unit (Capsule), which includes a plurality of multiplexing units;   the management information contains playback sequence information (PGC) indicating a playback sequence of the system stream;   the playback sequence information (PGC) is described by a combination of playback portions (Cells) corresponding to one or a plurality of continuous system streams;   the management information contains connection information (connection_code) for each playback portion, the connection information (connection_code) indicating whether each playback portion is played back seamlessly from the playback portion in a previous playback sequence; and   according to the constrained format, the system stream immediately before a seamless connection point is recorded to end with a complete data management unit (Capsule), when the connection information (connection_code) of the playback portion indicates a seamless playback, and the complete data management unit (Capsule) starts with a Tip packet.   
     
     
         2 . An information recording apparatus for encoding audio information and video information into a system stream and recording the system stream with associated management information to an information recording medium, wherein
 the system stream is allowed to have a first format (TS), the first format (TS) having a packet structure for storing data segmented in packets,   the first format (TS) is allowed to have a constrained format used for converting the system stream from the first format (TS) to a second format (PS), the second format (PS) having a pack structure for storing data segmented in packs,   with the constrained format, a predetermined number of packets are grouped and managed as a multiplexing unit, which corresponds to the pack of the second format(PS), and the system stream is managed in a data management unit (Capsule), which includes a plurality of multiplexing units,   the management information contains playback sequence information (PGC) indicating a playback sequence of the system stream,   the playback sequence information (PGC) is described by a combination of playback portions (Cells) corresponding to one or a plurality of continuous system streams,   the management information contains connection information (connection_code) for each playback portion, the connection information (connection_code) indicating whether each playback portion is played back seamlessly from the playback portion in a previous playback sequence,   the information recording apparatus comprises:
 a first encoding section that applies a specific encoding process to the video information and the audio information to generate a video elementary stream and an audio elementary stream based on the first format (TS); 
 a second encoding section that applies system-encoding to multiplex the video elementary stream and the audio elementary stream into a system stream based on the first format (TS); and 
 a controller that controls the first and second encoding sections, and 
 the controller controls the first and second encoding sections so that the system stream immediately before a seamless connection point ends with a complete data management unit (Capsule), when the connection information (connection_code) of the playback portion indicates a seamless playback, and the complete data management unit (Capsule) starts with a Tip packet. 
   
     
     
         3 . A method for encoding audio information and video information into a system stream and recording the system stream with associated management information to an information recording medium, wherein
 the system stream is allowed to have a first format (TS), the first format (TS) having a packet structure for storing data segmented in packets,   the first format (TS) is allowed to have a constrained format used for converting the system stream from the first format (TS) to a second format (PS), the second format (PS) having a pack structure for storing data segmented in packs,   with the constrained format, a predetermined number of packets are grouped and managed as a multiplexing unit, which corresponds to the pack of the second format(PS), and the system stream is managed in a data management unit (Capsule), which includes a plurality of multiplexing units,   the management information contains playback sequence information (PGC) indicating a playback sequence of the system stream,   the playback sequence information (PGC) is described by a combination of playback portions (Cells) corresponding to one or a plurality of continuous system streams,   the management information contains connection information (connection_code) for each playback portion, the connection information (connection_code) indicating whether each playback portion is played back seamlessly from the playback portion in a previous playback sequence,   when the connection information (connection_code) indicates seamless playback, a third system stream (Bridge-VOB) including a part of each of two seamlessly connected system streams is used to enable seamless playback,   the information recording method comprises:
 applying a specific encoding process to the video information and the audio information to generate a video elementary stream and an audio elementary stream based on the first format (TS); and 
 multiplexing and system encoding the video elementary stream and the audio elementary stream based on the first format (TS) to generate the system stream, and 
   wherein the encoding process encodes so that the system stream immediately before a seamless connection point ends with a complete data management unit (Capsule), when the connection information (connection_code) of the playback portion indicates a seamless playback, and the complete data management unit (Capsule) starts with a Tip packet.