WO2004036578A1 - Recording medium having data structure for managing reproduction of multiple graphics streams recorded thereon and recording and reproducing methods and apparatuses - Google Patents

Recording medium having data structure for managing reproduction of multiple graphics streams recorded thereon and recording and reproducing methods and apparatuses Download PDF

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Publication number
WO2004036578A1
WO2004036578A1 PCT/KR2003/002100 KR0302100W WO2004036578A1 WO 2004036578 A1 WO2004036578 A1 WO 2004036578A1 KR 0302100 W KR0302100 W KR 0302100W WO 2004036578 A1 WO2004036578 A1 WO 2004036578A1
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WO
WIPO (PCT)
Prior art keywords
recording medium
graphics
stream
multiple graphics
streams
Prior art date
Application number
PCT/KR2003/002100
Other languages
French (fr)
Inventor
Byung Jin Kim
Kang Soo Seo
Soung Hyun Um
Original Assignee
Lg Electronics Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to JP2004545028A priority Critical patent/JP4903998B2/en
Priority to AT03751516T priority patent/ATE547792T1/en
Priority to CA002469178A priority patent/CA2469178C/en
Priority to EP03751516A priority patent/EP1552520B1/en
Priority to AU2003269521A priority patent/AU2003269521B2/en
Publication of WO2004036578A1 publication Critical patent/WO2004036578A1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B20/1251—Formatting, e.g. arrangement of data block or words on the record carriers on discs for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B20/1252—Formatting, e.g. arrangement of data block or words on the record carriers on discs for discontinuous data, e.g. digital information signals, computer programme data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
    • G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/84—Television signal recording using optical recording
    • H04N5/85—Television signal recording using optical recording on discs or drums
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1288—Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/213—Read-only discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2541—Blu-ray discs; Blue laser DVR discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
    • H04N9/8227—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal the additional signal being at least another television signal

Definitions

  • the present invention relates to a recording medium having a data structure for managing reproduction of at least multiple graphics streams recorded thereon as well as methods and apparatuses for reproduction and recording.
  • An optical disc such as a DVD (Digital Versatile Disc) , capable of recording high quality video and audio data for many hours, is being developed and released to consumer markets.
  • DVD-ROM and DVD-RW DVD-Rewritable
  • Video and audio streams in a DVD-ROM are recorded in units of a program stream packet defined by the MPEG standard.
  • one pack corresponds to a single physical sector with the record size of 2048 bytes.
  • a single pack is composed of a pack header and includes packets of video, audio, and sub-pictures.
  • the pack header includes pack start code (Pack_start_code) , SCR, program mux rate (program_mux_rate) , and stuffing length (Stuffing_length) .
  • multiple audio streams may be recorded in a number of respective coding formats in a data area of the DVD-ROM.
  • an optical disc apparatus such as a DVD player may comprise an optical pickup 111, a VDP (Video Disc Play) system 112, a D/A converter 113.
  • the VDP system 112 may comprise a PS DEMUX 120 and a decoding block 121.
  • the VDP system 112 reads out and plays video and audio streams recorded in the DVD-ROM 110 in units of a program stream packet.
  • the PS DEMUX 120 may output, for example, subtitle data, recorded with main video and audio streams in a part of data area of said DVD-ROM, to the decoding block 121 by demultiplexing in units of a PES (Packetized Elementary Stream) .
  • PES Packetized Elementary Stream
  • the decoding block 121 then performs a series of decoding operations on the subtitle data of packetized elementary streams received from the PS DEMUX 120 in order for the subtitle data to be displayed together with the main video, e.g., as a caption overlay.
  • a user can watch the caption overlay of the subtitle data together with the main video frame.
  • the recording medium includes a data structure for managing reproduction of at least multiple graphics streams recorded on the recording medium.
  • a data area of the recording medium stores at least multiple graphics streams in at least one portion thereof, the multiple graphics streams being multiplexed.
  • Each graphics stream is a transport stream and stored as one or more packets.
  • Each packet has a packet identifier, and the packets of a same graphics stream have a same packet identifier.
  • at least one of the multiple graphics streams is a subtitle stream.
  • the recording medium includes a clip information file area having at least one clip information file stored therein.
  • the clip information file includes management information for reproducing multiple graphics streams recorded on the recording medium.
  • the multiple graphics streams are recorded as transport packets, and each transport packet in a same graphics stream has a same packet identifier.
  • the management information identifies each of the multiple graphics streams based on the associated packet identifier.
  • the management information indicates the coding and display information for each graphics stream.
  • the recording medium includes a management area having at least one program information field stored therein.
  • Each program information field includes one or more program sequences.
  • Each program sequence is associated with a different segment of at least a graphics presentation and includes management information for managing reproduction of at least one graphics stream in the associated segment.
  • At least one of the program sequences includes management information for multiple graphics streams in the associated segment.
  • a data area of the recording medium has at least one graphics information packet stored therein.
  • the graphics information packet includes management information for managing reproduction of multiple graphics streams recorded as packets along with the graphics information packet.
  • the present invention further provides apparatuses and methods for recording and reproducing the data structure according to the present invention, and recording and reproducing multiple audio streams according to the present invention. 4. BRIEF DESCRIPTION OF DRAWINGS
  • FIG. 1 is a diagram illustrating the data pack structure of a DVD-ROM
  • FIG. 2 is a diagram illustrating the structure of a DVD player reading out data recorded in a DVD-ROM;
  • Fig. 3 illustrates an exemplary embodiment of a recording medium file or data structure according to the present invention
  • Fig. 4 illustrates an example of a recording medium having the data structure of Fig. 3 stored thereon;
  • Fig. 5 illustrates portions of the structure of a program information field recorded on an optical disc according to an embodiment of the present invention
  • FIG. 6 illustrates a graphical representation of an A/V stream including multiple graphics streams structured and managed according to an embodiment of the present invention
  • FIG. 7 is a diagram illustrating the structure of an optical disc apparatus where the present invention is applied.
  • a high-density optical disk for example, a Blu-Ray ROM (BD-ROM), BD-RE, etc. in accordance with the invention may have a file or data structure for managing reproduction of video and audio data as shown in Fig. 6.
  • BD-ROM Blu-Ray ROM
  • BD-RE Blu-Ray ROM
  • Fig. 6 A high-density optical disk, for example, a Blu-Ray ROM (BD-ROM), BD-RE, etc. in accordance with the invention may have a file or data structure for managing reproduction of video and audio data as shown in Fig. 6.
  • the root directory contains at least one
  • the BD directory includes general files (not shown) , a PLAYLIST directory in which playlist files (e.g., *.mpls) are stored, a CLIPINF directory in which clip information files
  • MPEG2-formatted A/V stream clip files (*.m2ts) , corresponding to the clip information files, are stored.
  • the STREAM directory includes MPEG2-formatted A/V stream files called clips or clip files.
  • the A/V stream includes source packets of video and audio data.
  • a source packet of video data includes a header and a transport packet .
  • a source packet includes a source packet number, which is generally a sequentially assigned number that serves as an address for accessing the source packet.
  • Transport packets include a packet identifier (PID) .
  • PID packet identifier
  • the CLIPINF directory includes a clip information file associated with each A/V stream file.
  • the clip information file indicates, among other things, the type of A/V stream associated therewith, sequence information, program information and timing information.
  • the sequence information describes the arrival time basis (ATC) and system time basis (STC) sequences.
  • the sequence information indicates, among other things, the number of sequences, the beginning and ending time information for each sequence, the address of the first source packet in each sequence and the PID of the transport packets in each sequence.
  • a sequence of source packets in which the contents of a program is constant is called a program sequence.
  • the program information indicates, among other things, the number of program sequences, the starting address for each program sequence, and the PID(s) of transport packets in a program sequence.
  • the timing information is referred to as characteristic point information (CPI) .
  • CPI characteristic point information
  • EP entry point map
  • the EP map maps a presentation time stamp (e.g. , on an arrival time basis (ATC) and/or a system time basis (STC) ) to a source packet address (i.e., source packet number) .
  • ATC arrival time basis
  • STC system time basis
  • PTS and the source packet number (SPN) are related to an entry point in the A/V stream; namely, the PTS and its related SPN point to an entry point on the A/V stream.
  • SPN source packet number
  • the packet pointed to is often referred to as the entry point packet .
  • the PLAYLIST directory includes one or more playlist files.
  • the concept of a playlist has been introduced to promote ease of editing/assembling clips for playback.
  • a playlist file is a collection of playing intervals in the clips. Each playing interval is referred to as a playitem.
  • the playlist file identifies each playitem forming the playlist, and each playitem, among other things, is a pair of IN-point and OUT-point that point to positions on a time axis of the clip (e.g., presentation time stamps on an ATC or STC basis) .
  • the playlist file identifies playitems, each playitem points to a clip or portion thereof and identifies the clip information file associated with the clip.
  • the clip information file is used, among other things, to map the playitems to the clip of source packets.
  • the general information files (not shown) provide general information for managing the reproduction of the A/V streams recorded on the optical disk.
  • Fig. 3 represents the areas of the recording medium.
  • the general information files are recorded in one or more general information areas
  • the playlist directory is recorded in one or more playlist directory areas
  • each playlist in a playlist directory is recorded in one or more playlist areas of the recording medium, etc.
  • Fig. 4 illustrates an example of a recording medium having the data structure of Fig. 3 stored thereon.
  • the recording medium includes a file system information area, a data base area and an A/V stream area.
  • the data base area includes a general information file and playlist information area and a clip information area.
  • the general information file and playlist information area have the general information files recorded in a general information file area thereof, and the PLAYLIST directory and playlist files recorded in a playlist information area thereof.
  • the clip information area has the CLIPINFO directory and associated clip information files recorded therein.
  • the A/V stream area has the A/V streams for the various titles recorded therein.
  • Video and audio data are typically organized as individual titles; for example, different movies represented by the video and audio data are organized as different titles. Furthermore, a title may be organized into individual chapters in much the same way a book is often organized into chapters.
  • BD-ROM and BD-RE optical disks Because of the large storage capacity of the newer, high-density recording media such as BD-ROM and BD-RE optical disks, different titles, various versions of a title or portions of a title may be recorded, and therefore, reproduced from the recording media. For example, video data representing different camera angles may be recorded on the recording medium. As another example, versions of title or portions thereof associated with different languages may be recorded on the recording medium. As a still further example, a director's version and a theatrical version of a title may be recorded on the recording medium. Or, an adult version, young adult version and young child version (i.e., different parental control versions) of a title or portions of a title may be recorded on the recording medium. Each version, camera angle, etc.
  • the video data in these instances is referred to as multiple reproduction path video data.
  • the different audio data available e.g., different languages, director's commentary, audio coding formats, etc.
  • Optical disks of high density also provide the opportunity to have multiple graphic or sub-picture streams recorded thereon and reproduced therefrom.
  • Graphics streams include subtitles, menus, images, etc.
  • subtitles of different languages may be recorded as different graphic streams.
  • a graphics stream is reproduced along with associated video and/or audio data and, for example, overlaid on the associated video.
  • the CLIPINF directory includes a clip information file associated with each A/V stream file, and a clip information file includes a program information field.
  • Fig. 5 illustrates portions of the structure of a program information field recorded on an optical disc according to an embodiment of the present invention. As shown, a length field indicates a length of the program information field, and a reserved_for_word_align field is reserved for future use. Next, a number of program sequences is indicated by the number_of_program_sequences field.
  • a program sequence is associated with a segment of, for example, a video, audio and/or graphics presentation.
  • the program information field provides at least the fields of: SPN_j?rogram_sequence_start [i] , program_map_PID [i] , graphics_PID [i] [ stream_index] , graphicsCodinglnfo (i, stream_index) , and graphicsDisplaylnfo (i, stream_index) .
  • the SPN_program_sequence_start [i] field indicates a source packet number of a source packet where the ith program sequence starts in the A/V stream file.
  • the program_map_PID [i] field indicates the value of the PID of the transport packets that shall contain the program map section applicable for the ith program sequence.
  • the graphic_PID [i] [stream_index] field indicates the PID value of each graphic stream in the ith program sequence .
  • the graphicCodinglnfo (i, stream_index) field indicates the coding format or method of coding each graphics stream in the ith program sequence.
  • the graphicsDisplaylnfo (i, stream_index) field indicates various display information for each graphics stream in the ith program sequence. For example, the display information may include display start and end information, display position information about the corresponding graphics data, size information, etc.
  • graphics_PID field may be used in several different ways.
  • graphics stream may be a subtitle, menu, image, etc.
  • Each graphics stream may be differentiated from another using the graphics_PID value.
  • the transport packets of a graphics stream have a same graphics_PID, and different graphics streams have different graphics_PIDs .
  • Fig. 6 illustrates a graphical representation of an A/V stream including multiple graphics streams structured and managed according to an embodiment of the present invention. As shown, transport packets for multiple graphics streams are divided into groups and the groups are multiplexed with groups of the other A/V stream transport packets (e.g., video and/or audio transport packets) .
  • groups of the other A/V stream transport packets e.g., video and/or audio transport packets
  • each graphics stream includes transport packets having a same graphics_PID, and the different graphics streams have different graphics_PIDs .
  • Fig. 6 shows the source packets, but as discussed above, a source packet is comprised of a header and a transport packet .
  • Fig. 6 shows first - third graphic streams #1 - #3 in a group.
  • the transport packets of the first graphics stream #1 each have a graphic_PID value of A'
  • the transport packets of the second graphics stream #2 each have a graphic_PID value of 'B'
  • the transport packets of the third graphics stream #3 each have a graphic_PID value of C .
  • a group of graphic stream packets begins with a graphics information packet.
  • the graphics information packet may include the same graphics coding and display information supplied by the program information field regarding the graphics streams in the associated group of graphic stream packets.
  • Fig. 7 illustrates a schematic diagram of an embodiment of an optical disk recording and reproducing apparatus according to the present invention.
  • an AV encoder 9 receives and encodes data (e.g., movie video, audio, graphics, etc.) .
  • the AV encoder 9 outputs the encoded data along with coding information and stream attribute information.
  • a multiplexer 8 multiplexes the encoded data based on the coding information and stream attribute information to create, for example, an MPEG-2 transport stream.
  • a source packetizer 7 packetizes the transport packets from the multiplexer 8 into source packets in accordance with the audio/video format of the optical disk.
  • the operations of the AV encoder 9, the multiplexer 8 and the source packetizer 7 are controlled by a controller 10.
  • the controller 10 receives user input on the recording operation, and provides control information to AV encoder 9, multiplexer 8 and the source packetizer 7.
  • the controller 10 instructs the AV encoder 9 on the type of encoding to perform, instructs the multiplexer 8 on the transport stream to create, and instructs the source packetizer 7 on the source packet format.
  • the controller 10 further controls a drive 3 to record the output from the source packetizer 7 on the optical disk.
  • the controller 10 also creates the navigation and management information for managing reproduction of the data being recorded on the optical disk. For example, based on information received via the user interface (e.g., instruction set saved on disk, provided over an intranet or internet by a computer system, etc.) the controller 10 controls the drive 3 to record one or more of the data structures of Figs. 3-6 on the optical disk.
  • the controller 10 controls the drive 3 to record one or more of the data structures of Figs. 3-6 on the optical disk.
  • the controller 10 controls the drive 3 to reproduce this data structure. Based on the information contained therein, as well as user input received over the user interface (e.g., control buttons on the recording and reproducing apparatus or a remote associated with the apparatus) , the controller 10 controls the drive 3 to reproduce the data from the optical disk.
  • the controller 10 controls the drive 3 to reproduce the data from the optical disk.
  • the reproduced source packets are received by a source depacketizer 4 and converted into a data stream (e.g., an MPEG-2 transport packet stream) .
  • a demultiplexer 5 demultiplexes the data stream into encoded data.
  • An AV decoder 6 decodes the encoded data to produce the original data that was feed to the AV encoder 9.
  • the controller 10 controls the operation of the source depacketizer 4, demultiplexer 5 and AV decoder 6.
  • the controller 10 receives user input on the reproducing operation, and provides control information to AV decoder 6, demultiplexer
  • the controller 10 instructs the AV decoder 9 on the type of decoding to perform, instructs the demultiplexer 5 on the transport stream to demultiplex, and instructs the source depacketizer 4 on the source packet format .
  • the controller 10 checks the characteristic packet ID (graphics_PID) recorded in each graphics packet. Next, graphics packets having packet IDs corresponding to a graphics stream selected by a user via the user interface (e.g., subtitle of a particular language) are routed to the AV decoder
  • the controller 10 also searches for and checks the corresponding graphics coding information (graphicsCodinglnfo) and graphic display information (graphicsDisplaylnfo) in the program information field or graphics information packet and instructs the decoder 6 to perform decoding and display operations according to the coding format and display information designated by the graphics coding and display information. For example with reference to Fig. 6, if the first graphics stream is a subtitle data for the English language and this subtitle stream is selected for display by the user, the optical disk recording and reproducing apparatus reproduces source packets #2, #4, #7, etc., having transport packets with a graphics_PID value of A" , which corresponds to the selected graphics stream.
  • Fig. 7 has been described as a recording and reproducing apparatus, it will be understood that only a recording or only a reproducing apparatus may be provided using those portions of Fig.
  • the present invention provides a recording medium having a data structure for managing multiple graphics streams recorded on a high-density recording medium (e.g., a high-density optical disk such as a BD-ROM) .
  • a high-density recording medium e.g., a high-density optical disk such as a BD-ROM
  • the present invention provides methods and apparatuses for recording a data structure on a high density recording medium for managing multiple graphics streams recorded on the recording medium.
  • the above description further provides methods and apparatus for reproducing multiple graphics streams recorded on a high density recording medium based on a data structure, also recorded on the high density recording medium, for managing the reproduction of the multiple graphics streams.

Abstract

The recording medium includes a data area storing at least multiple graphics streams in at least one portion thereof. The multiple grapics streams are multiplexed, and each graphics stream is a transport stream stored as one or more packets. Each packet has a packet identifier, and the packets of the same graphics stream have the same packet identifier.

Description

D E S C R I P T I O N
RECORDING MEDIUM HAVING DATA STRUCTURE FOR MANAGING REPRODUCTION OF MULTIPLE GRAPHICS STREAMS RECORDED THEREON AND RECORDING AND REPRODUCING METHODS AND APPARATUSES
1. TECHNICAL FIELD
The present invention relates to a recording medium having a data structure for managing reproduction of at least multiple graphics streams recorded thereon as well as methods and apparatuses for reproduction and recording.
2. BACKGROUND ART
An optical disc such as a DVD (Digital Versatile Disc) , capable of recording high quality video and audio data for many hours, is being developed and released to consumer markets. Various types of DVD exist including DVD-ROM and DVD-RW (DVD-Rewritable) . Video and audio streams in a DVD-ROM are recorded in units of a program stream packet defined by the MPEG standard. As shown in FIG. 1, one pack corresponds to a single physical sector with the record size of 2048 bytes. A single pack is composed of a pack header and includes packets of video, audio, and sub-pictures. The pack header includes pack start code (Pack_start_code) , SCR, program mux rate (program_mux_rate) , and stuffing length (Stuffing_length) .
In a DVD-ROM where a single physical sector corresponds to a single pack in the above-described manner, multiple audio streams may be recorded in a number of respective coding formats in a data area of the DVD-ROM.
As shown in FIG. 2, an optical disc apparatus such as a DVD player may comprise an optical pickup 111, a VDP (Video Disc Play) system 112, a D/A converter 113. The VDP system 112 may comprise a PS DEMUX 120 and a decoding block 121.
The VDP system 112 reads out and plays video and audio streams recorded in the DVD-ROM 110 in units of a program stream packet. The PS DEMUX 120 may output, for example, subtitle data, recorded with main video and audio streams in a part of data area of said DVD-ROM, to the decoding block 121 by demultiplexing in units of a PES (Packetized Elementary Stream) .
The decoding block 121 then performs a series of decoding operations on the subtitle data of packetized elementary streams received from the PS DEMUX 120 in order for the subtitle data to be displayed together with the main video, e.g., as a caption overlay.
Accordingly, a user can watch the caption overlay of the subtitle data together with the main video frame.
Recently, standardization of high-density optical discs such as a read-only Blu-ray disc (BD-ROM) , which has a higher recording capacity than a DVD, is underway. However, an appropriate method for managing multiple graphics streams for the high-density optical disc has not been established.
3. DISCLOSURE OF INVENTION
The recording medium according to the present invention includes a data structure for managing reproduction of at least multiple graphics streams recorded on the recording medium. In one exemplary embodiment, a data area of the recording medium stores at least multiple graphics streams in at least one portion thereof, the multiple graphics streams being multiplexed. Each graphics stream is a transport stream and stored as one or more packets. Each packet has a packet identifier, and the packets of a same graphics stream have a same packet identifier. In one exemplary embodiment, at least one of the multiple graphics streams is a subtitle stream. According to another exemplary embodiment of the present invention, the recording medium includes a clip information file area having at least one clip information file stored therein. The clip information file includes management information for reproducing multiple graphics streams recorded on the recording medium. For example, the multiple graphics streams are recorded as transport packets, and each transport packet in a same graphics stream has a same packet identifier. The management information identifies each of the multiple graphics streams based on the associated packet identifier. As further examples, the management information indicates the coding and display information for each graphics stream.
According to another exemplary embodiment of the present invention, the recording medium includes a management area having at least one program information field stored therein. Each program information field includes one or more program sequences. Each program sequence is associated with a different segment of at least a graphics presentation and includes management information for managing reproduction of at least one graphics stream in the associated segment. At least one of the program sequences includes management information for multiple graphics streams in the associated segment.
In a further exemplary embodiment, a data area of the recording medium has at least one graphics information packet stored therein. The graphics information packet includes management information for managing reproduction of multiple graphics streams recorded as packets along with the graphics information packet.
The present invention further provides apparatuses and methods for recording and reproducing the data structure according to the present invention, and recording and reproducing multiple audio streams according to the present invention. 4. BRIEF DESCRIPTION OF DRAWINGS
The above features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a diagram illustrating the data pack structure of a DVD-ROM;
FIG. 2 is a diagram illustrating the structure of a DVD player reading out data recorded in a DVD-ROM; Fig. 3 illustrates an exemplary embodiment of a recording medium file or data structure according to the present invention;
Fig. 4 illustrates an example of a recording medium having the data structure of Fig. 3 stored thereon;
Fig. 5 illustrates portions of the structure of a program information field recorded on an optical disc according to an embodiment of the present invention;
Fig. 6 illustrates a graphical representation of an A/V stream including multiple graphics streams structured and managed according to an embodiment of the present invention; and FIG. 7 is a diagram illustrating the structure of an optical disc apparatus where the present invention is applied.
5. MODES FOR CARRYING OUT THE INVENTION
A high-density optical disk, for example, a Blu-Ray ROM (BD-ROM), BD-RE, etc. in accordance with the invention may have a file or data structure for managing reproduction of video and audio data as shown in Fig. 6.
As shown in Fig. 3, the root directory contains at least one
BD directory. The BD directory includes general files (not shown) , a PLAYLIST directory in which playlist files (e.g., *.mpls) are stored, a CLIPINF directory in which clip information files
(*.clpi) are stored, and a STREAM directory in which
MPEG2-formatted A/V stream clip files (*.m2ts) , corresponding to the clip information files, are stored.
The STREAM directory includes MPEG2-formatted A/V stream files called clips or clip files. The A/V stream includes source packets of video and audio data. For example, a source packet of video data includes a header and a transport packet . A source packet includes a source packet number, which is generally a sequentially assigned number that serves as an address for accessing the source packet. Transport packets include a packet identifier (PID) . The CLIPINF directory includes a clip information file associated with each A/V stream file. The clip information file indicates, among other things, the type of A/V stream associated therewith, sequence information, program information and timing information. The sequence information describes the arrival time basis (ATC) and system time basis (STC) sequences. For example, the sequence information indicates, among other things, the number of sequences, the beginning and ending time information for each sequence, the address of the first source packet in each sequence and the PID of the transport packets in each sequence. A sequence of source packets in which the contents of a program is constant is called a program sequence. The program information indicates, among other things, the number of program sequences, the starting address for each program sequence, and the PID(s) of transport packets in a program sequence.
The timing information is referred to as characteristic point information (CPI) . One form of CPI is the entry point (EP) map.
The EP map maps a presentation time stamp (e.g. , on an arrival time basis (ATC) and/or a system time basis (STC) ) to a source packet address (i.e., source packet number) . The presentation time stamp
(PTS) and the source packet number (SPN) are related to an entry point in the A/V stream; namely, the PTS and its related SPN point to an entry point on the A/V stream. The packet pointed to is often referred to as the entry point packet .
The PLAYLIST directory includes one or more playlist files. The concept of a playlist has been introduced to promote ease of editing/assembling clips for playback. A playlist file is a collection of playing intervals in the clips. Each playing interval is referred to as a playitem. The playlist file, among other things, identifies each playitem forming the playlist, and each playitem, among other things, is a pair of IN-point and OUT-point that point to positions on a time axis of the clip (e.g., presentation time stamps on an ATC or STC basis) . Expressed another way, the playlist file identifies playitems, each playitem points to a clip or portion thereof and identifies the clip information file associated with the clip. The clip information file is used, among other things, to map the playitems to the clip of source packets. The general information files (not shown) provide general information for managing the reproduction of the A/V streams recorded on the optical disk.
In addition to illustrating the data structure of the recording medium according to an embodiment of the present invention, Fig. 3 represents the areas of the recording medium. For example, the general information files are recorded in one or more general information areas, the playlist directory is recorded in one or more playlist directory areas, each playlist in a playlist directory is recorded in one or more playlist areas of the recording medium, etc. Fig. 4 illustrates an example of a recording medium having the data structure of Fig. 3 stored thereon. As shown, the recording medium includes a file system information area, a data base area and an A/V stream area. The data base area includes a general information file and playlist information area and a clip information area. The general information file and playlist information area have the general information files recorded in a general information file area thereof, and the PLAYLIST directory and playlist files recorded in a playlist information area thereof. The clip information area has the CLIPINFO directory and associated clip information files recorded therein. The A/V stream area has the A/V streams for the various titles recorded therein.
Video and audio data are typically organized as individual titles; for example, different movies represented by the video and audio data are organized as different titles. Furthermore, a title may be organized into individual chapters in much the same way a book is often organized into chapters.
Because of the large storage capacity of the newer, high-density recording media such as BD-ROM and BD-RE optical disks, different titles, various versions of a title or portions of a title may be recorded, and therefore, reproduced from the recording media. For example, video data representing different camera angles may be recorded on the recording medium. As another example, versions of title or portions thereof associated with different languages may be recorded on the recording medium. As a still further example, a director's version and a theatrical version of a title may be recorded on the recording medium. Or, an adult version, young adult version and young child version (i.e., different parental control versions) of a title or portions of a title may be recorded on the recording medium. Each version, camera angle, etc. represents a different reproduction path, and the video data in these instances is referred to as multiple reproduction path video data. Similarly, the different audio data available (e.g., different languages, director's commentary, audio coding formats, etc.) provide different audio streams for reproduction. Optical disks of high density also provide the opportunity to have multiple graphic or sub-picture streams recorded thereon and reproduced therefrom. Graphics streams include subtitles, menus, images, etc. For example, subtitles of different languages may be recorded as different graphic streams. Typically, a graphics stream is reproduced along with associated video and/or audio data and, for example, overlaid on the associated video.
The data structure for managing reproduction of multiple graphics streams for a high-density optical disk in accordance with embodiments of the present invention will be described along with methods and apparatuses according to embodiments of the present invention for recording and reproducing multiple graphics streams . As discussed above, the CLIPINF directory includes a clip information file associated with each A/V stream file, and a clip information file includes a program information field. Fig. 5 illustrates portions of the structure of a program information field recorded on an optical disc according to an embodiment of the present invention. As shown, a length field indicates a length of the program information field, and a reserved_for_word_align field is reserved for future use. Next, a number of program sequences is indicated by the number_of_program_sequences field. As discussed above, a program sequence is associated with a segment of, for example, a video, audio and/or graphics presentation. For each program sequence i, the program information field provides at least the fields of: SPN_j?rogram_sequence_start [i] , program_map_PID [i] , graphics_PID [i] [ stream_index] , graphicsCodinglnfo (i, stream_index) , and graphicsDisplaylnfo (i, stream_index) .
The SPN_program_sequence_start [i] field indicates a source packet number of a source packet where the ith program sequence starts in the A/V stream file. The program_map_PID [i] field indicates the value of the PID of the transport packets that shall contain the program map section applicable for the ith program sequence. The graphic_PID [i] [stream_index] field indicates the PID value of each graphic stream in the ith program sequence . The graphicCodinglnfo (i, stream_index) field indicates the coding format or method of coding each graphics stream in the ith program sequence. The graphicsDisplaylnfo (i, stream_index) field indicates various display information for each graphics stream in the ith program sequence. For example, the display information may include display start and end information, display position information about the corresponding graphics data, size information, etc.
The graphics_PID field may be used in several different ways. As discussed above, graphics stream may be a subtitle, menu, image, etc. Each graphics stream may be differentiated from another using the graphics_PID value. Namely, according to the present invention, the transport packets of a graphics stream have a same graphics_PID, and different graphics streams have different graphics_PIDs . Fig. 6 illustrates a graphical representation of an A/V stream including multiple graphics streams structured and managed according to an embodiment of the present invention. As shown, transport packets for multiple graphics streams are divided into groups and the groups are multiplexed with groups of the other A/V stream transport packets (e.g., video and/or audio transport packets) . Within a group of graphic stream packets, the packets for different graphics streams are multiplexed. As shown, each graphics stream includes transport packets having a same graphics_PID, and the different graphics streams have different graphics_PIDs . Specifically, Fig. 6 shows the source packets, but as discussed above, a source packet is comprised of a header and a transport packet .
Fig. 6 shows first - third graphic streams #1 - #3 in a group. The transport packets of the first graphics stream #1 each have a graphic_PID value of A' , the transport packets of the second graphics stream #2 each have a graphic_PID value of 'B' , and the transport packets of the third graphics stream #3 each have a graphic_PID value of C .
Fig. 6 further shows that in one exemplary embodiment, a group of graphic stream packets begins with a graphics information packet. The graphics information packet may include the same graphics coding and display information supplied by the program information field regarding the graphics streams in the associated group of graphic stream packets. Fig. 7 illustrates a schematic diagram of an embodiment of an optical disk recording and reproducing apparatus according to the present invention. As shown, an AV encoder 9 receives and encodes data (e.g., movie video, audio, graphics, etc.) . The AV encoder 9 outputs the encoded data along with coding information and stream attribute information. A multiplexer 8 multiplexes the encoded data based on the coding information and stream attribute information to create, for example, an MPEG-2 transport stream. A source packetizer 7 packetizes the transport packets from the multiplexer 8 into source packets in accordance with the audio/video format of the optical disk. As shown in Fig. 11, the operations of the AV encoder 9, the multiplexer 8 and the source packetizer 7 are controlled by a controller 10. The controller 10 receives user input on the recording operation, and provides control information to AV encoder 9, multiplexer 8 and the source packetizer 7. For example, the controller 10 instructs the AV encoder 9 on the type of encoding to perform, instructs the multiplexer 8 on the transport stream to create, and instructs the source packetizer 7 on the source packet format. The controller 10 further controls a drive 3 to record the output from the source packetizer 7 on the optical disk.
The controller 10 also creates the navigation and management information for managing reproduction of the data being recorded on the optical disk. For example, based on information received via the user interface (e.g., instruction set saved on disk, provided over an intranet or internet by a computer system, etc.) the controller 10 controls the drive 3 to record one or more of the data structures of Figs. 3-6 on the optical disk.
During reproduction, the controller 10 controls the drive 3 to reproduce this data structure. Based on the information contained therein, as well as user input received over the user interface (e.g., control buttons on the recording and reproducing apparatus or a remote associated with the apparatus) , the controller 10 controls the drive 3 to reproduce the data from the optical disk.
The reproduced source packets are received by a source depacketizer 4 and converted into a data stream (e.g., an MPEG-2 transport packet stream) . A demultiplexer 5 demultiplexes the data stream into encoded data. An AV decoder 6 decodes the encoded data to produce the original data that was feed to the AV encoder 9. During reproduction, the controller 10 controls the operation of the source depacketizer 4, demultiplexer 5 and AV decoder 6. The controller 10 receives user input on the reproducing operation, and provides control information to AV decoder 6, demultiplexer
5 and the source packetizer 4. For example, the controller 10 instructs the AV decoder 9 on the type of decoding to perform, instructs the demultiplexer 5 on the transport stream to demultiplex, and instructs the source depacketizer 4 on the source packet format .
When multiple graphics streams are recorded in a data area of the BD-ROM, the controller 10 checks the characteristic packet ID (graphics_PID) recorded in each graphics packet. Next, graphics packets having packet IDs corresponding to a graphics stream selected by a user via the user interface (e.g., subtitle of a particular language) are routed to the AV decoder
6 by the demultiplexer 5 under the control of the controller 10.
The controller 10 also searches for and checks the corresponding graphics coding information (graphicsCodinglnfo) and graphic display information (graphicsDisplaylnfo) in the program information field or graphics information packet and instructs the decoder 6 to perform decoding and display operations according to the coding format and display information designated by the graphics coding and display information. For example with reference to Fig. 6, if the first graphics stream is a subtitle data for the English language and this subtitle stream is selected for display by the user, the optical disk recording and reproducing apparatus reproduces source packets #2, #4, #7, etc., having transport packets with a graphics_PID value of A" , which corresponds to the selected graphics stream.
While Fig. 7 has been described as a recording and reproducing apparatus, it will be understood that only a recording or only a reproducing apparatus may be provided using those portions of Fig.
7 providing the recording or reproducing function.
As will be appreciated from the forgoing disclosure, the present invention provides a recording medium having a data structure for managing multiple graphics streams recorded on a high-density recording medium (e.g., a high-density optical disk such as a BD-ROM) .
As apparent from the above description, the present invention provides methods and apparatuses for recording a data structure on a high density recording medium for managing multiple graphics streams recorded on the recording medium.
The above description further provides methods and apparatus for reproducing multiple graphics streams recorded on a high density recording medium based on a data structure, also recorded on the high density recording medium, for managing the reproduction of the multiple graphics streams.
While the invention has been disclosed with respect to a limited number of embodiments, those skilled in the art, having the benefit of this disclosure, will appreciate numerous modifications and variations there from. For example, while described with respect to a Blu-ray ROM optical disk in several instances, the present invention is not limited to this standard of optical disk or to optical disks. It is intended that all such modifications and variations fall within the spirit and scope of the invention.

Claims

1. A recording medium having a data structure for managing reproduction of multiple graphics streams, comprising: a data area storing at least multiple graphics streams in at least one portion thereof, the multiple graphics streams being multiplexed, each graphics stream being a transport stream and stored as one or more packets, each packet having a packet identifier, and the packets of a same graphics stream having a same packet identifier.
2. The recording medium of claim 1, wherein at least one of the multiple graphics streams is a subtitle stream.
3. The recording medium of claim 1, further comprising: a management area including management information for managing reproduction of the multiple graphics streams.
4. The recording medium of claim 3, wherein the management information includes the packet identifier for each of the multiple graphics streams.
5. The recording medium of claim 4, wherein the management information includes coding format information for each of the multiple graphics streams.
6. The recording medium of claim 4, wherein the management information includes display information for each of the multiple graphics streams .
7. The recording medium of claim 3 , wherein a program information field includes the management information for managing reproduction of the multiple graphics streams .
8. The recording medium of claim 7, wherein a clip information file includes the program information field.
9. The recording medium of claim 3, wherein a clip information file stored in the management area includes the management information for managing reproduction of the multiple graphics streams.
10. The recording medium of claim 3, wherein a graphics information packet recorded with the packets of the multiple graphics streams includes the management information.
11. A recording medium having a data structure for managing reproduction of multiple graphics streams, comprising: a data area of the recording medium storing multiple graphics streams as transport packets, and each transport packet in a same graphics stream having a same packet identifier; and a clip information file area of the recording medium having at least one clip information file stored therein, the clip information file including management information for reproducing the multiple graphics streams recorded on the recording medium, the management information identifying each of the multiple graphics streams based on the associated packet identifier.
12. The recording medium of claim 11, wherein in at least a portion of the data area, transport packets for the multiple graphics streams are multiplexed.
13. The recording medium of claim 11, wherein the management information identifies a coding format for each of the multiple graphics streams .
14. The recording medium of claim 11, wherein the management information includes display information for each of the multiple graphics streams.
15. The recording medium of claim 11, wherein the clip information file includes at least one program information field, the program information field including the management information for one or more program sequences, each program sequence associated with a different segment of at least a graphics presentation.
16. A recording medium having a data structure for managing reproduction of multiple graphics streams, comprising: a management area having at least one program information field stored therein, each program information field including one or more program sequences, each program sequence associated with a different segment of at least a graphics presentation and including management information for managing reproduction of at least one graphics stream in the associated segment, and at least one program sequence including management information for multiple graphics streams in the associated segment.
17. The recording medium of claim 16, wherein the management information of each program sequence identifies each graphics stream in the associated segment.
18. The recording medium of claim 17, wherein a data area of the recording medium stores each graphics stream as transport packets, and each transport packet in a same graphics stream has a same packet identifier; and the management information identifies each graphics stream based on the associated packet identifier.
19. The recording medium of claim 17, wherein at least a portion of the data area stores a segment having multiple graphics streams associated therewith, and the transport packets for the associated multiple graphics streams are multiplexed in the portion of the data area.
20. The recording medium of claim 17, wherein the management information identifies a coding format for each graphics stream in the associated segment.
21. The recording medium of claim 17, wherein the management information provides display information for each graphics stream in the associated segment .
22. A recording medium having a data structure for managing reproduction of multiple graphics streams, comprising: a data area having at least one graphics information packet stored therein, the graphics information packet including management information for managing reproduction of multiple graphics streams recorded as packets along with the graphics information packet.
23. A method of reproducing a data structure for managing reproduction of multiple graphics streams from a recording medium, comprising: reproducing at least multiple graphics streams from a portion of the recording medium in which the multiple graphics streams are multiplexed, each graphics stream being a transport stream and stored as one or more packets, each packet having a packet identifier, and the packets of a same graphics stream having a same packet identifier.
24. An apparatus for reproducing a data structure for managing reproduction of multiple graphics streams from a recording medium, comprising: a driver for driving an optical reproducing device to reproduce data recorded on the recording medium; a controller for controlling the driver to reproduce at least multiple graphics streams from a portion of the recording medium in which the multiple graphics streams are multiplexed, each graphics stream being a transport stream and stored as one or more packets, each packet having a packet identifier, and the packets of a same graphics stream having a same packet identifier.
25. A method of recording a data structure for managing reproduction of multiple graphics streams on a recording medium, comprising: recording at least multiple graphics streams in a portion of the recording medium such that the multiple graphics streams are multiplexed, each graphics stream being a transport stream and recorded as one or more packets, each packet having a packet identifier, and the packets of a same graphics stream having a same packet identifier.
26. An apparatus for recording a data structure for managing reproduction of graphic data on a recording medium, comprising: a driver for driving an optical recording device to record data on the recording medium; an encoder for encoding at least multiple reproduction path video data; and a controller for controlling the driver to record at least multiple graphics streams in a portion of the recording medium such that the multiple graphics streams are multiplexed, each graphics stream being a transport stream and recorded as one or more packets, each packet having a packet identifier, and the packets of a same graphics stream having a same packet identifier.
PCT/KR2003/002100 2002-10-15 2003-10-11 Recording medium having data structure for managing reproduction of multiple graphics streams recorded thereon and recording and reproducing methods and apparatuses WO2004036578A1 (en)

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AT03751516T ATE547792T1 (en) 2002-10-15 2003-10-11 RECORDING MEDIUM HAVING A DATA STRUCTURE FOR MANAGING PLAYBACK OF MULTIPLE GRAPHICS STREAMS RECORDED THEREON AND RECORDING AND PLAYBACKING METHODS AND APPARATUS
CA002469178A CA2469178C (en) 2002-10-15 2003-10-11 Recording medium having data structure for managing reproduction of multiple graphics streams recorded thereon and recording and reproducing methods and apparatuses
EP03751516A EP1552520B1 (en) 2002-10-15 2003-10-11 Recording medium having data structure for managing reproduction of multiple graphics streams recorded thereon and recording and reproducing methods and apparatuses
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