PLAYBACK DEVICE, PLAYBACK METHOD, AND RECORDING MEDIUM
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`This is a continuation of U.S. Patent Application No. 16/251,688, filed January 18,
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`2019, whichis a continuation of U.S. Patent Application No. 15/278,582, filed September
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`28, 2016, now U.S. Patent 10,255,951, issued April 9, 2019, which is a continuation of
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`International Patent Application No. PCT/JP2015/003547, filed July 14, 2015, which
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`claims the benefit of U.S. Provisional Patent Application No. 62/034,389, filed August 7,
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`2014, and of Japanese Patent Application No. 2015-115045,filed June 5, 2015. The
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`entire disclosure of each of the above-identified documents, including the specification,
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`drawings, and claims, is incorporated herein by referencein its entirety.
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`1. Technical Field
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`BACKGROUND
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`[0001] The present disclosure relates to a playback device that plays encoded video
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`streams, a playback method, and a recording medium.
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`2. Description of the Related Art
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`[0002]
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`Technologyrelating to digital versatile discs (DVD) has conventionally been
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`disclosed (e.g., Japanese Unexamined Patent Application Publication No. 9-282848).
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`SUMMARY
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`[0003]
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`In one general aspect, the techniques disclosed here feature A playback device
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`that reads out a video stream, which is encoded video information, from a recording
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`medium,and plays the video stream. The playback device includes: an attribute reader
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`that reads outfirst attribute information, indicating whether a dynamic rangeof luminance
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`of the video streamis a first dynamic range or a second dynamicrangethat is wider than
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`the first dynamic range, from a managementinformationfile recorded in the recording
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`medium in a mannercorrelated with the video stream; a decoder that generates decoded
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`video information by reading the video stream out from the recording medium and decode
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`the video stream; and an outputter that, in a case wherethefirst attribute information that
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`has beenread out indicates the second dynamic range, outputs the decoded video
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`information, along with maximum luminance information indicating a maximum luminance
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`of the video stream in accordance with the second dynamic range.
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`[0004] According to the above form, further improvement can berealized.
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`[0005]
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`It should be noted that general or specific embodiments may be implemented as
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`a system, a method, an integratedcircuit, a computer program, a storage medium, or any
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`selective combination thereof.
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`[0006]
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`Additional benefits and advantages of the disclosed embodiments will become
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`apparent from the specification and drawings. The benefits and/or advantages may be
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`individually obtained by the various embodiments and features of the specification and
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`drawings, which need notall be provided in order
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`to obtain one or more of such benefits and/or advantages.
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`BRIEF DESCRIPTION OF THE DRAWINGS
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`(0007)
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`Fig. 1 is a diagram illustrating an SD-DVD structure;
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`Fig. 2 is a schematic diagram for describing navigation information embedded in
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`an MPEG stream, which is AV data:
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`Fig. 3 is a schematic diagram illustrating a VOB structure in a DVD;
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`Fig. 4 is a diagram illustrating a data hierarchy of a BD-ROM;
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`Fig. 5 is a diagram illustrating a structure of logical data recorded in a BD-ROM;
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`Fig. 6 is a diagram illustrating an overview of a basic configuration of a BD-ROM
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`player that plays BD-ROMs;
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`Fig. 7 is a block diagram where the configuration of the player ilustrated in Fig. 6
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`is detailed;
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`rig. 8 is a diagram illustrating application space of a BD-ROM;
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`Fig. 9 is a diagram illustrating the configuration of an MPEG stream (VOB);
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`Fig. 10 is a diagram illustrating the configuration of packs in an MPEG stream:
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`Fig. 14 is a diagram for describing the relationship between AV data and player
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`configuration:
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`rig. 12 is a diagram for describing a VOB data continuous supply model using a
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`track buffer:
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`Fig. 13 is a diagram illustrating the internal structure of a VOB management
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`information file;
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`Fig. 14 is a diagram for describing the details of VOBU information;
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`Fig. 15 is a diagram for describing an address information acquisition method
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`using a time map;
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`Fig. 16 is a diagram illustrating the configuration of a playlist:
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`Fig. 17 is a diagram illustrating the configuration of an event handier table:
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`rig. 18 is a diagram illustrating the configuration of BD.INFO whichis overall BD-
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`ROM information;
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`Fig. 19 is a diagram illustrating the structure of a global event handler table;
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`Fig. 20 is a diagram illustrating an example of a time event;
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`Fig. 21 is a diagram illustrating an example of a user event due fo a user having
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`operaied a menu:
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`Fig. 22 is a diagram illustrating an example of a global event:
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`Fig. 23 is a diagram for describing the functional configuration of a prograrn
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`processor;
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`Fig. 24 is a diagram illustrating a list of system parameters (SPRM}:
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`Fig. 25 is a diagram illustrating an example of a program in an event handier
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`according to control of a menu screen having two selection buttons:
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`Fig. 26 is a diagram illustrating an example of a program in an event handler
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`relating io a menu selection user event:
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`Fig. 27 is a flowchart illustrating the flow of basic processing for playback of AV
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`data in a BD-ROM player;
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`Fig. 28 is a flowchart illustrating the flow of processing in a BD-ROM player from
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`starting fo play a playlist until ending playing of the VOB;
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`Figs. 29A and 298 are flowcharts, Fig. 29A illustrating the flow of processing
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`relating to a time event in a BD-ROM player, and Fig. 29B illustrating the flow of
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`processing relating to a user event in a BD-ROM player;
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`Fig. 30 is a flowchart illustrating the flow of processing subtitie data in a BD-ROM
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`player:
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`Figs. 31A and 318
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`are diagrams describing the arrays of NAL units;
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`Fig. 32 is a diagram for describing an example of MPEG-2 TS multiplexing of an
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`HDR video stream;
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`Fig. 33 is a diagram for describing an example of MPEG-2 TS multiplexing of an
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`HOR video stream;
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`Fig. 34 is a diagram for describing an example of MPEG-2 TS multiplexing of an
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`HDR video stream;
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`Fig. 35 is a diagram for describing an example of MPEG-2 TS multiplexing of an
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`HDR video stream;
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`Fig. 36 is a diagram for describing an example of MPEG-2 TS muttiplexing of an
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`HDR video stream;
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`rig. 37 is a diagram for describing an example of MPEG-2 TS multiplexing of an
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`HDR video stream;
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`Fig. 38 is a diagram for describing an example of MPEG-2 TS multiplexing of an
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`HOR video stream;
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`Fig. 39 is a diagram for describing management information of an HDR video
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`stream:
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`Fig. 40 is a diagram for describing a decoder model of an HDR video stream;
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`Fig. 41A is a block diagram illustrating an exarnple of the configuration of a
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`playback device: and
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`Fig. 41B
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`is a flowchart illustrating an example of a playback method.
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`DETAILED DESCRIPTION
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`Underlying Knowledge Forming Basis of the Present Disclosure
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`{6608} However, further improvement was needed with the aforementioned
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`Japanese Unexamined Patent Application Publication No. 9-282848. The present
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`inventors found that a problem occurs relating to the technology mentioned in the
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`“Related Ari”. This problem will be described below in detail.
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`[0603] Most representative of information recording media recording video data
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`is the DVD (hereinafier, may also be referred to as “Standard Definition” (SD-
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`DVD). A conventional DVD will be described below.
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`{0010}
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`Fig. 1 is a diagram illustrating the structure of an SD-DVD. As iustrated
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`to the lower side of Fig. 1, the DVD disc has a logical address space provided
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`between a read-in and a read-out. Volurne information of a file system is recorded
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`from the beginning of the logical address space, and after that is recorded
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`application data such as video, audio, and so forth.
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`{0071}
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`Thefile system is an arrangement for managing data, that is stipulated by
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`Standards such as 1SO8660, Universal Disc Format (UDF), and so forth, and is an
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`arrangement to express data on the disc in increments called directories or files.
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`There are file systems called File Allocation Tables (FAT) and NT File System
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`(NTFS) in everyday-use personal computers (PC) as well, whereby data recorded
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`in a hard disk are expressed on ihe computer as structures called directories or
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`files, thereby improving usability.
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`{OG12]
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`inthe case of an SD-DVD, both UDF and iSOS660 fille systems are used.
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`The two together are also referred to as "UDF bridge”. The recorded data is
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`arranged so thai the data can be read out by a file system driver according to
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`either UBF or 1SO9660. Note that the DVD used here is a ROM disc for packaged
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`media, to which writing is physically impossible.
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`[0013] Data recorded in the DVD can be viewed through the UDF bridge as
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`directories or files such as illustrated to the upperleft in Fig. 7.
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`Immediately below
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`the root directory CROOT"in Fig. 1) is placed a directory called “VIDEOTS", and
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`it is here that DVD application data is recorded. Application data is recorded as
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`mulipie files, primary files being the following typesoffiles.
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`VIDEOTS.FO Disc play control information file
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`VTS_01_G.1FO
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`Videotitle set #1 play control information file
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`VTS_01_0.VOB
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`Videotitle set #1 stream file
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`[0614] As shown in the above example, two suffixes are stipulated. "IFO" is a
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`suffix indicating that the file has play control information recorded therein, and
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`"/OB"is a suffix indicating that the file has an MPEG stream, which is audiovisual
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`{AV) data, recorded therein.
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`[0075]
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`Play control information is information attached to the AV data, such as
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`information to realize interactivity employed with the DVD (technology to
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`dynamicaily change playing in response to user operations), metadata. and se
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`forth. Play control inforrnation is commonly referred fo as navigation information
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`regarding DVDs.
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`[0076] The play control information files include the “VIDEOQ_TS.IFO"that
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`manages the entire disc, and the "VTS_01_0.IFO"thatis play control information
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`for individual video title sets. Note that multiple titles, in other words, multiple
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`different movies and tunes, can be recorded in a single disc in the case of DVD.
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`Now, "01" in the file name body indicates the No. of the video title set, and in the
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`case of the videotitle set #2, for example, this is "VTS_02_0.IFO".
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`{60717} The upper right portion in Fig. 1 is OVD navigation spacein the
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`application layer of the DVD, and is the logical structure space where the
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`aforementioned play control information is loaded.
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`information within the
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`"VIDEO_TS.IFO"is loaded in the DVD navigation space as VIDEO Manager
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`information (VMGH, as well as are "VTS_01_0.iFO" and play contro! information
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`existing for each of other videotitle sets as Video Title Set Information (VTSH.
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`{0018} Described in the VTSI is Program Chain Information (PGC) whichis
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`information of a play sequence called Program Chain (PGC}. PGC is made up of
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`a set of Cells and a type of programing information called commands.
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`[0613] A Cell itself is information indicating a partial section or a whole section of
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`a VOB (short for Video Object, and indicates an MPEG stream), and playing a Cell
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`means to play the section of this VOB instructed by the Cell.
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`{06020} Commands are processed by a virtual machine of the DVD, and are
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`close to JavaScript (a registered trademark} and so forth executed in browsers to
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`display Web pages, for example. However, while JavaScript (registered
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`trademark} performs window or browser control (e.g., opening a new browser
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`window, etc.) besides logical operations, DVD command differin that they only
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`execute playback control of AV titles, e.g., instructing a chapter to play or the like,
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`for example, besides logical operations.
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`[0621] A Cell has the start and end addresses (logical addresses) of a VOB
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`recorded in the disc as internal information thereof. A player reads out data using
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`the start and end address information of the VOB described in the Cell, and
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`executes playback.
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`[0022]
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`Fig. 2 is an overview for describing navigation information embedded in
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`an MPEG stream, which is AV data.
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`Interactivity, which is a feature of the SD-
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`DVD, is realized not only by the navigation information recorded in the
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`aforementioned "VIDEO_TS.IFO" and "VTS_01_0.1FO" and so forth. Several
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`important sets of information are multiplexed in the VOB along with video and
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`audio data, using a dedicated carrier called navigation packs (called navi-pack or
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`NV_PCK}.
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`{0023} A menu screen will be described here as a simple example of interactivity.
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`Several butions are shown on the menu screen, with processing to be executed
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`defined for each button when that button is selected.
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`[0624] One button is selected on the menu screen (a translucent coloris
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`overlaid on the selected bution in highlight that button, indicating to the user that
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`button is in a selected state), and the user can move the button in the selected
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`state to any of the butions above or below,fo the left or to the right, using arrow
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`keys on a remote controller.
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`[0625] Using the arrow keys of the remote controller to move the highlight to the
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`button to be selected and executed, and okaying (pressing an OK key) executes
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`the program of the corresponding command. Generally, playback of a
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`corresponding tithe or chapter is execuled by ihe command.
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`[0626] The upper iefi portion in Fig. 2 shows an overview of information stored in
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`an NV_PCK. Highlight color information, information of individual buttons, and so
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`forth, are included in the NV_PCK. Color palette information is described in the
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`highlight color information, specifying the highlight translucent color to be
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`displayed overiaid.
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`[0627] Described in the bution information are rectangular region information
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`which is the position information of each button, moving information from that
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`button to other buttons (specification of destination buttons corresponding to each
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`operation of the arrow keys by the user}, and button command information (a
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`command to be executed when that button is ckayed).
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`[0028] The highlight on the menu screen is created as an overlaid image, as
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`ilustrated to the upper right portion in Fig. 2. The overlaid image is an object
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`where rectangular region information of button information has been given colorin
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`color palette information. This overlaid image is composited with the background
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`image illustrated at the right portion in Fig. 2, and displayed on the screen.
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`0029] The menu screen of a DVD is realized as described above. The reason
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`why part of the navigation data is embedded in the strearn using an NV_PCKis as
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`follows. That is, to realize without problem processing where synchronization
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`timing readily becomes problematic, such as dynamically updating menu
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`information synchronously with the stream, for example, displaying a menu screen
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`for just five to ten minutes partway through playing a movie.
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`[6630] Another major reason is to improve user operability, such as fo store
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`information for supporting special playback in an NV_PCK, so that AV data can be
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`decoded and played smoothly during non-normal playback, such as fast-forward
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`and fast-rewind while playing the DVD.
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`[0631]
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`Fig. 3 is a schematic diagram illustrating the configuration of a VOB ina
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`DVD. Data such as video, audio, and subtitles (1) in Fig. 3) are packelized and
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`packed according to the MPEG system (SO/IEC13818-1)} Standard ((2)in Fig. 3),
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`and these are multiplexed to form a single MPEG program stream ((3} in Fig. 3},
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`as illustrated in Fig. 3. The NV_PCKs including button commands for realizing
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`interactivity are also multicolexed along with these, as described above.
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`{0632} A feature of multiplexing in the MPEG system is that the individual pixels
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`of data that are multiplexed are in a bit string based on decoding order, but the bit
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`string is not necessarily formed in playback order, that is to say decoding order,
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`among the multiplexed data, L.e., among the video, audio, and subtitles.
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`[0633] This is due to a decoder model of the MPEG system stream ((4) in Fig. 3,
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`generally referred to as System Target Decoder or STD) has decoder buffers
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`corresponding fo each elementary stream after demultiplexing, that temporarily
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`stored the daia until the decoding timing.
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`[0634] These decoder buffers have different sized according to each of the
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`individual elementary streams, having 232 KB for video, 4 KB for audio, and 52 kB
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`for subtitles. Accordingly, the data input timing to each decoder buffer differs
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`among the individual elementary streams, so there is discrepancy between the
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`order of forming the bit string as the MPEG system stream, and the timing of
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`displaying (decoding). That is to say, the subtitle data multiplexed aiong with the
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`video data is not necessarily decoded at the same time.
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`[0635] Now, in a large-capacity recording media such as a Blu-ray (registered
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`trademark} disc, there is a possibility that extremely high-definition video
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`information can be stored. Note that Blu-ray (registered trademark) disc, is also
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`called BD or BD-ROM.
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`[0636]
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`For example,it is conceivable that video information such as 4K (video
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`information having resolution of 3840 = 2160 pixels) or HDR (high-luminosity
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`video information, generally called High Dynamic Range) may be stored in a BD.
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`However, there are various methods to express luminosity including HDR, and
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`there has been no format that can record and manage video information of these
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`realization methods efficiently as a video stream. Accordingly, there is a problem
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`that the playback device cannot suitably express luminosity according io the type
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`of video stream recorded in the recording medium such as the BD (the above-
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`described realization method). The Present inventors studied the following
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`improvement measures to solve the above problem.
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`[0037] A playback device according to one form of the present disclosure reads
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`out a video stream, which is encoded video information, frorn a recording medium,
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`and plays the video stream. The playback device includes: an attribute reader that
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`reads out first attribute information, indicating whether a dynamic range of
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`luminance of the video stream is a first dynamic range or a second dynamic range
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`that is wider than the first dynamic range, frornm a managementinformation file
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`recorded in ine recarding medium in a manner correlated with the video stream: a
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`decoder that generates decoded video information by reading the video stream out
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`from the recording medium and decoding the video stream; and an outoutter that,
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`in a case where thefirst altrioute information that has been read out indicates the
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`second dynamic range, outputs the decoded video information, along with
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`maximum luminance information indicating a maximum luminance of the video
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`stream in accordance with the second dynamic range.
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`[0038] Accordingly, luminance according to the type of video stream recorded in
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`the recording medium (particularly, the dynamic range} can be appropriately
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`expressed.
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`(0039) Also, in a case where thefirst attribute information indicates the second
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`dynamic range, the first attribute information may also indicate the type of the
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`second dynamic range, and wherein the outputier may output the maximum
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`luminance information and the decoded video information in accordance with the
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`type of the second dynamic range. For example, in a case where the type
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`indicated by the first attribute information is a type where the luminance range of
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`the video stream is statically expressed, the outputter outputs the maximum
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`luminance information where the maximum luminanceis statically indicated, and
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`the decoded video information. Alternatively, in a case where the type indicated
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`by the first attribute information is a type where the luminance range of the video
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`stream is statically and dynamically expressed, the outputter outouts the maximum
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`luminance information where the maximum luminance is statically and dynamically
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`indicated, and the decoded video information. Note that the maximum luminance
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`information statically indicates the luminance range by indicating a luminance
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`range defined by the maximum luminance ofall pictures in the video stream, and
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`dynamicaily indicates the luminance range by indicating a luminance range for
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`each of groups made up of one or a plurality of pictures included in the video
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`stream, the luminance range being defined by the maximum luminance of the
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`group. Alternatively, in a case where the type indicated by the first altribute
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`information is a type where luminanceis expressed by a base video stream, and
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`an enhanced video stream to enhance luminance of the base video stream, the
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`decoder generates the decoded video information by decoding the video stream
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`as the enhanced video stream, and further reads out the base video stream from
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`the recording medium and decodes the base video stream to generate ihe base
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`video Information, and the outputter outputs the maximum luminance information
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`and the decoded video information subjected to image processing using the base
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`video information
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`[0640] Accordingly, luminance can be suitably expressed in accordance with the
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`type of the video stream, regardless of what type of video stream is recorded in
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`the recording medium.
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`in other words, regardless of the realization method of the
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`HDR video stream recorded in the recording medium, luminance can be suitably
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`expressed in accordance with thai realization method.
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`[0641] The attribute reader may further read out second attribute information
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`indicating the maximum luminance of the video stream from the management
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`information file, and the outputter may further output the maximum luminance
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`information including the second altribute information. Accordingly, the luminance
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`of the video stream can be expressed even more appropriately.
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`[0642] Also, a recording medium according to one form of the present disclosure
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`has recorded therein a video stream that is encoded video information, and a
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`management information file correlated with the video stream. The management
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`information file includesfirst attribute information, indicating whether a dynamic
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`range of luminance of the video stream is a first dynamic range or a second
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`dynamic range that is wider than the first dynamic range.
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`[0043] Accordingly, the playback device can be made to appropriately express
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`luminance in accordance with the type of the video stream. Also, HDR video
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`streams of different realization methods can be efficiently recorded and managed
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`in the same recording medium.
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`[0044]
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`Ina case where thefirst atirioute information indicates the second
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`dynamic range,the first attribute information may also indicate the type of the
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`second dynamic range. For example, The first attribute information indicates a
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`first type where the luminance range of the video stream is statically expressed, as
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`the type of the second dynamic range. Alternatively, Thefirst attribute information
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`indicates a second type where the luminance range of the video strearn is
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`statically and dynamically expressed, as the type of the second dynamic range.
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`Note that in the second type, the luminance range of the video stream is statically
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`expressed by including in the video stream first supplemental extension
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`information indicating the maximum juminance of all pictures in the video stream,
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`and the luminance range of the video stream is dynamically expressed by
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`including in the video stream second supplemental extension information
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`indicating, for each of groups made up of one or a plurality of pictures included in
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`the video stream, the luminance range being defined by the maximum luminance
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`of the group. Alternatively, the first attribute information indicates a third type,
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`where luminance is expressed by a base video stream, and an enhanced video
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`stream which is a video stream fo enhance luminance of the base video stream,
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`as the type of the second dynamic range, and the recording medium further has
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`recorded therein the base video stream.
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`[0645] Accordingly, the playback device can be made to appropriately express
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`luminance in accordance with the type of the video stream, regardiess of what
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`type of video stream is recorded in the recording medium.
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`in other words,
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`regardiess of the realization method of the HDR video stream recorded in the
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`recording medium, the playback device can be made to appropriately express
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`luminance in accordance with that realization method.
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`[0648] Aliso, the management information file may further include second
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`attribute information indicating the maximum luminanceof the video stream.
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`Accordingly, the playback device can be made to appropriately express luminance
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`in accordance with the type of the video stream.
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`[0647] These general or specific aspects may be realized by a device, method,
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`sysiem, integrated circuit, computer program, or computer-readable recording
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`medium such as a CD-ROM, and may be realized by any combination of a system,
`
`method, integrated circuit, computer program, and recording medium.
`
`[0048]
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`Preferred embodiments to carry out the present disclosure will be
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`described below with reference fo the atlached drawings.
`
`it should be noted that
`
`the second embodiment is the closest to the disclosure in a first aspect of the
`
`present application, the basic configuration of the information recording medium
`
`and so forth in the second embedment will be described first by way of thefirst
`
`embodiment, to facililate understanding.
`
`First Embodiment
`
`[0049]
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`First, the basic structure and operations of a BD-ROM and a BD-ROM
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`player that plays BD-ROMs will be described with reference to Figs. 1 through 30.
`
`Logical Data Structure on Disc
`
`[0650]
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`Fig. 4 is a diagram illustrating data hierarchy on a BD-ROM. As
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`litustrated in Fig. 4, there are recorded in a 8D-ROM 104 thatis a disc medium,
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`AV data 103, BD managementinformation 102 such as management information
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`relating to the AV data, AV playback sequence, and so forth, and a BD playback
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`program 101 that realizes interactivity.
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`[0651] Note that in the present embodiment, description of BD-ROM will be
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`made primarily with regard fo an AV application that plays AV contents such as
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`movies, but a BD-ROM can be used as a recording medium for computer use,in
`
`the same way as with CR-ROMs and DVD-ROMs, as a matter of course.
`
`[0652]
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`Fig. 5 is a diagram illustrating the structure of logical data recorded on the
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`above BD-ROM 104. The BD-ROM 104 has a recording region in the form of a
`
`spiral from the inner perimeter thereof toward the outer perimeter, and has a
`
`logical address space where logical data can be recorded, between a read-in at
`
`the inner perimeter and a read-out at the outer perimeter, in the same way as with
`
`other optical discs, such as DVDs and CDs, for example.
`
`[0653] On the inner side of the read-in there is a special region called a Burst
`
`Cutting Area (BCA), that can only be read out by the drive. This region is
`
`unreadable by applications, and accordingly is often used in copyright protection
`
`technology and so forth, for example.
`
`[0054] Application data such as video data and thelike is recorded the logical
`
`address space, with file system information (volume) at the beginning thereof. The
`
`file system is the arrangement for managing data stipulated by a standard such as
`
`UDF or [SO9660 or the like, as described above in the conventional art. Logical
`
`data recorded therein can be read out using the directory and file structure, in the
`
`same way as with a normal PC.
`
`[0655]
`
`inthe case of the present embodiment, the directory and file structure on
`
`the BD-ROM 104 has a BDVIDEO directory immediately below the root directory
`
`(ROOT). This directory is a directory in which data, such as AV data and
`
`management information handied by the BD-ROM (ihe BD piayback program 101,
`
`BD managementinformation 102, and AV data 103 illustrated in Fig. 4) is
`
`recorded.
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`[0056] The following seven types of files are recorded beneath the BDVIBDEO
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`directory.
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`BD.INFO (fixed filename)
`
`This is one of “BD management information", and is a file in which is
`
`recorded information relating to the entire BD-ROM. The BD-ROM player reads
`
`out this file first.
`
`BD.PROG (fixed filename}
`
`This is one of "BD playback programs", and is a file in which is recorded a
`
`program relating to the entire BD-ROM.
`
`SXACPL (XMXK"is variable, suffix "PL"is fixed)
`
`This is one of "BD management information”, and is a file in which is
`
`recorded playlist (Play List} information that records a scenario. Each playlist has
`
`one file.
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`AXKX.PROG CXXXM"is variable, suffix "PROG"is fixed)
`
`This is one of "BD playback programs", and is a file in which is recorded a
`
`program for each aforementioned playlist. The correlation to the playlist is
`
`identified by the file body name (XXX" matches).
`
`YYY.VOB (@YYY"is variable, suffix "VOB"is fixed)
`
`This is one of "AV data’, and is a file in which is recorded a VOB (the same
`
`as the VOB described in the exampie of the conventional art), One VOB
`
`correspondsto onefile.
`
`YYY. VOBI CYYY"is variable, suffix "VOBI"is fixed)
`
`This is one of "BD management information", and is a file in which is
`
`recorded management information relating to the VOB which is AV data. The
`
`correlation to the VOB is identified by the file body name (YYY" matches}.
`
`222.PNG (ZZ2"is variable, suffix "PNG"is fixed)
`
`This is one of "AV data", and is a file in PNG (an image format standardized
`
`by the World Wide Web Consortium (WV/3C} and is pronounced “ping") which is
`
`image data for configuring subltities and menu screens. One PNG image
`
`corresponds to onefile.
`
`Piayer Configuration
`
`[0057] Next, the configuration of a player that plays ihe BD-ROM 104 will be
`
`described with reference to Figs. 6 and 7. Fig. 6 is a schematic diagram
`
`litustrating the basic configuration of a BD-ROM player that plays the BD-ROM 104.
`
`The BD-ROM playerillustrated in Fig. 6 reads oul data on the BD-ROM 104 via an
`
`optical pickup 202. The data that is read out is stored in dedicated memory in
`
`accordance with the type of each data.
`
`[0658] The BD playback program ("BD.PROG"or "XXX.PROG"file) is recorded
`
`in program recording memory 203, the BD management information (BD.INFO",
`
`"XXX.PL", or "YYY.VOBI"file) in management information recording memory 204,
`
`and AV data (U'YYYVOB"or "Z27,. PNG"file) in AV recording memory 205,
`
`respectively.
`
`[0653] The BD playback program recorded in the program recording memory
`
`203 is processed by a program processing unit 206. The BD management
`
`information recorded in the management information recording memory 204 is
`
`processed by a management information processing unit 207. Also, the AV data
`
`recorded in the AV recording memory 205 is processed by a presentation
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`processing unit 208.
`
`[6660] The program processing unit 206 receives information of a playlist to be
`
`played fram and event information such as the timing to execute a prograrn from
`
`the management information processing unit 207, and performs processing of the
`
`program. The playlist to play can be dynamically changed at the program, and this
`
`can be realized by sending a play command ofthe playlist after changing to the
`
`management information processing unit 207.
`
`{0061} The program processing unit 206 further accepts events from the user,
`
`such as requests from a remote controller that the user operates for example, and
`
`in a case where there is a program corresponding to the user event, executes the
`
`processing.
`
`[0062] The management information processing unit 207 receives instructions
`
`from the program processing unit 206 and analyzes a playlist corresponding to
`
`that instruction and the management information of a VOB corresponding to that
`
`playlist. Further, instructions of AV data to be played are given to the presentation
`
`processing unit 208.
`
`[0063] The management information processing unit 207 also receives
`
`reference time information from the presentation processing unit 208, and
`
`performs stopping instruction of the AV data playback to the presentation
`
`processing unit 208 based on the time information. Further, an event is generated
`
`indicating ine program executing timing as to the program processing unit 206.
`
`[0064] The presentation processing unit 208 has decoders corresponding to
`
`each data of video, audio, and subtitles, and decodes and outputs AV data in
`
`accordance with instructions from the management information processing unit
`
`207. The video data and subtitle data is drawn on respective dedicated planes
`
`a