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US20050084248A1 - Recording medium having data structure for managing reproduction of text subtitle data and recording and reproducing methods and apparatuses - Google Patents

Recording medium having data structure for managing reproduction of text subtitle data and recording and reproducing methods and apparatuses Download PDF

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Publication number
US20050084248A1
US20050084248A1 US10/960,514 US96051404A US2005084248A1 US 20050084248 A1 US20050084248 A1 US 20050084248A1 US 96051404 A US96051404 A US 96051404A US 2005084248 A1 US2005084248 A1 US 2005084248A1
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US
United States
Prior art keywords
text subtitle
data
subplayitem
recording medium
clip
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Abandoned
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US10/960,514
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English (en)
Inventor
Jea Yoo
Kang Seo
Byung Kim
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LG Electronics Inc
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Individual
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Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, BYUNG JIN, SEO, KANG SOO, YOO, JEA YONG
Publication of US20050084248A1 publication Critical patent/US20050084248A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • G11B27/32—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 separate auxiliary tracks of the same or an auxiliary record carrier
    • G11B27/327—Table of contents
    • G11B27/329—Table of contents on a disc [VTOC]
    • 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
    • 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
    • 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
    • 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
    • G11B2220/2545—CDs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • 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
    • 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
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
    • 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
    • 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
    • H04N9/8233—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 a character code 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
    • H04N9/87—Regeneration of colour television signals
    • H04N9/8715—Regeneration of colour television signals involving the mixing of the reproduced video signal with a non-recorded signal, e.g. a text signal

Definitions

  • the present invention relates to high density recording media such as optical discs, and in particular, blu-ray read-only discs.
  • DVD digital versatile disc
  • Subtitle information that is to be displayed on screen as characters or logo during playback of a DVD title (e.g., a movie) is, in general, recorded on the DVD as bitmap-formatted image data.
  • the subtitle information is read out from the digital versatile disc and output to an external device such as a TV set after a series of signal processing steps so that the subtitle is displayed on the screen of the external device.
  • an external device such as a TV set after a series of signal processing steps so that the subtitle is displayed on the screen of the external device.
  • BD-ROM blu-ray read-only disc
  • a recording medium includes a data structure for managing reproduction of text subtitle data.
  • the recording medium stores at least one subplayitem.
  • the subplayitem identifies more than one clip information file name, and each clip information file named by the subplayitem indicates an associated clip of text subtitle data to reproduce from the recording medium.
  • the text subtitle data in each clip is associated with at least a portion of main presentation data recorded on the recording medium, and the subplayitem indicates a single presentation interval for the associated clips.
  • the navigation area also stores at least one playitem, and the playitem indicates at least a portion of the main presentation data to reproduce.
  • the playitem identifies a clip information file name that indicates a clip of main presentation data to reproduce, and the clip information files identified by the subplayitem and the playitem are separate files.
  • each clip information file named by the subplayitem indicates a different associated clip of text subtitle data.
  • more than one of the associated clips of text subtitle data are each associated with a different foreign language.
  • the recording medium stores at least one playlist including navigation information for reproducing main presentation data and text subtitle data associated with the main presentation data.
  • the navigation information also indicates that the text subtitle data is part of a text subtitle subpath.
  • the playlist includes at least one subplayitem that provides navigation information for reproducing more than one clip of text subtitle data from the recording medium.
  • the subplayitem indicates a single presentation interval for the clips of text subtitle data.
  • the recording medium stores separate clips of text subtitle data and at least one separate clip of main presentation data.
  • the text subtitle data is associated with the main presentation data.
  • the recording medium also stores a subplayitem providing navigation information for reproducing the separate clips of text subtitle data for a same presentation interval, and stores a playitem providing navigation information for reproducing the clip of main presentation data.
  • the present invention further provides apparatuses and methods for recording and reproducing the data structure according to the present invention.
  • FIGS. 1 to 4 illustrate embodiments of a file system structure, navigation data structure, and disc volume of an optical disc in accordance with the present invention
  • FIGS. 5 to 20 illustrate embodiments of navigation data structure in accordance with the present invention for linking a plurality of text subtitle streams to a main audio/video stream;
  • FIG. 21 illustrates a block diagram of the optical disc reproducing apparatus in accordance with the present invention.
  • FIGS. 22 to 24 illustrate block diagrams of embodiments of partial components of the optical disc reproducing apparatuses in accordance with the present invention.
  • the file structure of an optical disc such as a BD-ROM in accordance with one embodiment of the present invention is shown in FIG. 1 .
  • the root directory includes, among other things, at least one BD directory.
  • the BD directory includes an index.bdmv file, a MovieObject.bdmv file, a JavaObject.bdmv file, a PLAYLIST directory, a CLIPINF directory, and a STREAM directory. Each of these files and directories will be discussed in detail below.
  • the PLAYLIST directory includes a plurality of playlist files (*.mpls), the CLIPINF directory including a plurality of clip information files (*.clpi), and the STREAM directory includes a plurality of MPEG2 transport stream formatted audio/video (A/V) stream clip files (*.m2ts).
  • the playlist file is associated with and identifies at least one clip information file.
  • the clip information file is associated with and identifies an A/V stream clip file to reproduce.
  • the MovieObject.bdmv or JavaObject.bdmv files include executable navigation commands or a command program for controlling the playback of playlists.
  • FIG. 2 illustrates example movie objects in the MovieObject.bdmv file.
  • the navigation commands contained in movie objects includes, among other things, playback of a playlist and jump to another movie object in response to a user's request.
  • the index.bdmv file links movie and/or Java objects to, for example, a plurality of titles.
  • movie objects are linked to elements of an index table that includes, for example, a plurality of titles (title # 1 to #n) and a title menu.
  • the index.bdmv file, MovieObject.bdmv file and/or JavaObject.bdmv file provide a hierarchical structure for controlling the playback of playlists.
  • the playlist files and clip information files provide a hierarchical structure for controlling reproduction of A/V stream clip files.
  • the disc volume of a BD-ROM is organized into a file system information area, a database area, and an A/V stream area.
  • the database area includes a general files and playlist information area and a clip information area.
  • the general files and playlist information area stores general files such as the MovieObject.bdmv file and the PLAYLIST directory.
  • the clip information area stores the clip information files.
  • the MPEG2 transport stream formatted clip files (*.m2ts) belonging to titles are stored in the A/V stream area.
  • bitmap-formatted subtitle data in addition to the main video data, bitmap-formatted subtitle data, text-formatted subtitle data, and/or etc. may be recorded thereon.
  • Either or both of the bitmap-formatted subtitle data and text-formatted subtitle data (hereinafter referred to as bitmap subtitle and text subtitle, respectively) may be multiplexed with the main video data before it is recorded on the BD-ROM (referred to as ‘in-mux’) or may be recorded separately thereon with no multiplexing (referred to as ‘out-of-mux’).
  • Bitmap subtitle data or text subtitle data may also be supplied from a content provider server (CP server) through networks such as the Internet.
  • the text subtitle data from the CP server may be transmitted in the MPEG2 transport stream (TS) format or a predetermined binary stream format like the extensible markup language (XML) format.
  • TS MPEG2 transport stream
  • XML extensible markup language
  • a plurality of the text subtitle data may be supplied from the CP server so as to provide the subtitles for several different languages.
  • streams of another type like audio streams may be supplied from the CP server together with the subtitle data.
  • the subtitle data that are either read out from an optical disc or supplied from a CP server may be linked to a main video data in such a way that the subtitle data are chosen and displayed appropriately, in a various way in response to a user's request while playback of the main video data, which will be described below in detail.
  • New navigation data structures based on playlist, playitem, subplayitem, or a predetermined structure are defined and used to link the bitmap subtitle data and/or text subtitle data with a main A/V stream being read out from the optical disc.
  • the navigation data structures are applicable when the text subtitle data is recorded on the BD-ROM or when it is already stored in memory such as a hard disk (HDD), RAM, flash memory, etc. in the optical reproducing apparatus. It is onto this memory that the text subtitle data supplied from the CP server (or read out from the BD-ROM) may be downloaded (or uploaded).
  • memory such as a hard disk (HDD), RAM, flash memory, etc. in the optical reproducing apparatus. It is onto this memory that the text subtitle data supplied from the CP server (or read out from the BD-ROM) may be downloaded (or uploaded).
  • navigation information or linking information required to associate the text subtitle stream on the memory with a main A/V stream may have different representation based on utilization of the uniform resource locator (URL) representation scheme, which will be described below.
  • URL uniform resource locator
  • the text subtitle stream file recorded thereon may be uploaded automatically in the directory of ‘lid://bd-disc-name/directories or title-name or chapter-number’ on the local persistent memory.
  • the HTTP-based or FTP-based directory name may be directly used for the URL-style representation of the linking information.
  • the memory may interpret the directory and filenames from the representations of ‘http://A-studio.com/directories/filename.ext’, or ‘ftp://A-studio.com/directories/filename.ext’, or ‘lid://A-studio.com/directories/filename.ext’, or the designated directory and file name that is automatically interpreted in reproduction.
  • FIG. 5 illustrates a first embodiment of a data structure according to the present invention.
  • one movie object or Java object is associated with and instructs playback of a playlist.
  • the playlist includes a playitem and a number of subplayitems, two in this example.
  • the playitem is a data structure providing the start or in time and the end or out time for playing back a clip file to which the playitem is indirectly linked. This is graphically represented in FIG. 5 by the double headed arrow labeled PlayItem. Also graphically shown in FIG. 5 , the playitem identifies a clip information file, which identifies a clip of the main A/V stream data to reproduce.
  • Each of the subplayitems belonging to the playlist (SubPlayItem # 1 , # 2 ) is linked to an associated clip information file.
  • the clip information files identified by the subplayitems are for text subtitles, and each clip information file identifies a different text subtitle stream.
  • the different text subtitle streams provide different language text subtitles.
  • the first text subtitle steam associated with the first subplayitem provides English language text subtitle data
  • the second text subtitle stream associate with the second playitem provides Korean language text subtitle data.
  • a plurality of subplayitems are used to link a plurality of text subtitle streams to the main A/V steam.
  • each of the text subtitle streams is associated uniquely with one of the plurality of the subplayitems belonging to a playlist.
  • Choice of a text subtitle stream is made in the playlist layer.
  • the text subtitle stream of a particular language is chosen by selecting a subplayitem belonging to the playlist that is associated with the desired language during reproduction of the main A/V stream pointed by the playitem in the playlist. Accordingly, during reproduction of the main A/V stream, the selected text subtitle data is reproduced.
  • the clip filename associated with the subplayitem may also be represented by the URL representation scheme.
  • the clip information of the text subtitle stream may be included in the clip information corresponding to the main A/V stream.
  • FIG. 6 illustrates an example of the data structure of a subplayitem according this embodiment of the present invention.
  • the subplayitem syntax includes, among other things, ‘Clip_Information_file_name’ field pointing to the text subtitle data or information file, ‘SubPlayItem_type’ field indicating whether or not the subplayitem is associated with a text subtitle stream (for example, the SubPlayitem_type is set to 3 to indicate a text subtitle), and ‘Application’ field for indicating application-oriented auxiliary information about the text subtitle stream such as an application type of the text subtitle stream (subtitle, karaoke, etc.) and a language code (English, Korean, etc.).
  • the subplayitem also includes a ‘length’ field indicating the length of the subplayitem, a ‘Clip_Codec_identifier’ field indicating the coding of the data, a ‘ref_to_STC_id’ field indicating a system time id for the clip steam file associated with the subplayitem, and ‘SubPlayItem_IN_time’ and ‘SubPlayItem_OUT_time’ fields indicating the presentation in time and presentation out time that define the playback interval of the clip stream file associated with the subplayitem.
  • the playitem defines the presentation interval of the main A/V stream. Referring back to FIG. 5 , FIG.
  • FIG. 5 graphically represents the presentation interval for each subplayitem by the double headed arrows labeled SubPlayItem 1 and SubPlayItem 2 .
  • the presentation interval of the subplayitems, and therefore, the text subtitle streams falls within the presentation interval of the playitem. This graphically conveys that the text subtitle streams are associated with the main A/V stream and are reproduced, when selected, during reproduction of the main A/V stream.
  • the graphical representation used in FIG. 5 will be repeatedly used in graphically representing the other embodiments of the present invention.
  • FIG. 7 illustrates a second embodiment of a data structure according to the present invention.
  • a plurality of playlists are used to link a plurality of text subtitle streams to the main A/V stream.
  • one movie object or Java object is associated with a plurality of playlists (PlayList # 1 , # 2 in this example), each including one playitem and one subplayitem.
  • the playitem belonging to each of the plurality of playlists is associated with clip information on the main A/V stream.
  • the plurality of subplayitems are each respectively associated with clip information (i.e., a clip information file), and each clip information corresponds uniquely to one of the plurality of the text subtitle streams of different languages (stream # 1 for English and stream # 2 for Korean).
  • a movie object or Java object is linked to a plurality of playlists, and one subplayitem belonging to each playlist is, in turn, associated uniquely with one of the plurality of text subtitle streams.
  • the text subtitle stream of a particular language is chosen by selecting one playlist in the object layer.
  • only one subplayitem associated with a text subtitle stream may be included in each playlist.
  • another subplayitem may be included for linking an audio stream.
  • the clip filename associated with the subplayitem may be represented by the URL representation scheme.
  • the clip information of the text subtitle stream may be included in the clip information corresponding to the main A/V stream.
  • FIG. 8 illustrates an example of the data structure of a subplayitem and a portion of the data structure of a playlist according this embodiment of the present invention
  • the subplayitem syntax is the same as the subplayitem syntax described above with respect to FIG. 6 except for the additional field ‘is_repeat_SubPlayItem’, which is reserved for future use.
  • the portion of the playlist syntax, AppInfoPlayList, shown in FIG. 8 includes a ‘PlayList_playback_type’ field for indicating whether or not the ‘Application’ field is included. For example, if the ‘Application’ field is included, then the ‘PlayList_playback type’field is set to 4. As shown in FIG. 8 , the ‘Application’ field in the playlist syntax is the same as the ‘Application’ field in the subplayitem syntax. In this embodiment, the ‘Application’ field may be included either in the playlist syntax, the subplayitem syntax, or both.
  • a subtitle language register may exist that indicates the subtitle languages available. Movie object command procedures or Java programs perform changes in the text subtitle stream by changing playlists with reference to the register. An example of such a register is described below with respect to FIG. 10 .
  • FIG. 9 illustrates a third embodiment of a data structure according to the present invention.
  • a plurality of objects moveie or Java
  • the plurality of movie objects or Java objects whose configuration is similar to that of objects for multipath reproduction are each associated uniquely with a playlist (PlayList # 1 , # 2 in this example).
  • the playitem belonging to each playlist is associated with clip information on the main A/V stream.
  • Each playlist also includes a subplayitem associated with clip information that corresponds uniquely to one of the plurality of text subtitle streams of different languages (stream # 1 for English and stream # 2 for Korean in this example).
  • the plurality of movie objects or Java objects are linked respectively to each of the plurality of playlists, and each subplayitem is associated uniquely with one of the plurality of text subtitle streams.
  • the text subtitle stream of a particular language is chosen by changing objects in the object layer.
  • only one subplayitem associated with a text subtitle stream may be included in each playlist.
  • another subplayitem may be included for linking an audio stream.
  • the clip filename associated with the subplayitem may be represented by the URL representation scheme.
  • the clip information of the text subtitle stream may also be included in the clip information corresponding to the main A/V stream.
  • the subplayitem syntax in this embodiment is the same as described above with respect to FIG. 8 .
  • the fields of ‘Clip_Information_file_name’, ‘SubPlayitem_type’, and ‘Application’ are included in the playlist syntax and the subplayitem syntax, as described in the second embodiment with reference to FIG. 8 .
  • a subtitle language register may exist to indicate the subtitle languages available. Movie object command procedures or Java programs perform changes in the text subtitle streams by changing playlists with reference to the register.
  • FIG. 10 illustrates an example embodiment of this register.
  • the subtitle language register includes, among other things, a subtitle type and a language code. For example, if the subtitle type is two bits long and is set to ‘01’, the subtitle type indicates the bitmap-formatted subtitle. If it is set to ‘10’, the subtitle type indicates the text subtitle.
  • FIG. 11 illustrates a fourth embodiment of a data structure according to the present invention.
  • a playitem is used to link a plurality of text subtitle streams to the main A/V stream.
  • one movie object or Java object is associated with a playlist.
  • a single playitem of the playlist is associated with clip information on the main A/V stream.
  • the playitem is also associated with a plurality of clip information that correspond respectively to each of the plurality of text subtitle streams of different languages (stream # 1 for English and stream # 2 for Korean in this example).
  • the playitem belonging to the playlist is linked to the main A/V stream and the plurality of text subtitle streams.
  • Choice of a text subtitle stream is made in the clip or stream layer.
  • the text subtitle stream of a particular language is chosen by selecting a text subtitle stream file based on the playlist while reproduction of the A/V stream.
  • the clip filename associated with the playitem may be represented by the URL representation scheme.
  • the clip information of the text subtitle streams may be included in the clip information corresponding to the main A/V stream.
  • the playitem syntax includes, among other things, the clip information filename ‘Clip_Information_file_name[0]’, an ‘exist_text_subtitle’ field for indicating whether or not text subtitle streams are included, and an ‘is_multi_angle’ field for indicating whether the playitem provides multiple camera angle main A/V streams.
  • the playitem further includes a ‘number_of_text_subtitles’ field for representing the number of text subtitles, an ‘is_seamless_text_subtitle_change’ field for indicating if seamless change between text subtitle streams is possible or not, and an ‘Application’ field as discussed above with respect to FIG. 8 .
  • the playitem For each text subtitle indicated by the ‘number_of_text_subtitles’ field, the playitem provides a clip information filename.
  • the clip information filename provides either a name of a clip information file that indicates a clip of a text subtitle stream or directly indicates the name of the clip of text subtitle stream.
  • FIG. 13 illustrates a fifth embodiment of a data structure according to the present invention.
  • a subplayitem is used to link a plurality of text subtitle streams to the main A/V stream.
  • one movie object or Java object is associated with a playlist.
  • the playitem belonging to the playlist is associated with clip information on the main A/V stream as was described with respect to the first embodiment.
  • a single subplayitem belonging to the playlist is associated with a plurality of clip information files, each corresponding uniquely to one of the plurality of text subtitle streams of different languages (stream # 1 for English and stream # 2 for Korean in this example).
  • the text subtitle streams in this and the other embodiments are not limited to two languages or these two languages.
  • one subplayitem belonging to the playlist is linked to the plurality of text subtitle streams.
  • Choice of a text subtitle stream is made in the clip or stream layer.
  • the text subtitle stream of a particular language is chosen by changing text subtitle stream files based on the playlist while reproduction of the A/V stream.
  • the playback or reproduction interval (e.g., ‘SubPlayItem_IN_time’ and ‘SubPlayItem_OUT_time’) is the same for each clip of text subtitle stream.
  • another subplayitem may be included for linking an audio stream.
  • the clip filename associated with the subplayitem may be represented by the URL representation scheme.
  • the clip information of the text subtitle streams may also be included in the clip information corresponding to the main A/V stream.
  • FIG. 14 illustrates an example of the data structure of a subplayitem according this embodiment of the present invention.
  • the subplayitem syntax includes, among other things, ‘SubPlayItem_type’ field for indicating whether or not the subplayitem is associated with text subtitle streams (for example, the SubPlayitem_type is set to 3 for text subtitles), a ‘number_of_text_subtitles’ field for representing the number of text subtitles, an ‘is_seamless_text_subtitle_change’ field for indicating if seamless change between text subtitle streams is possible or not, and an ‘Application’ field as described in the previous embodiments.
  • ‘SubPlayItem_type’ field for indicating whether or not the subplayitem is associated with text subtitle streams (for example, the SubPlayitem_type is set to 3 for text subtitles)
  • a ‘number_of_text_subtitles’ field for representing the number of text subtitles
  • an ‘is_seamless_text_subtitle_change’ field for indicating
  • the subplayitem syntax also includes the ‘SubPlayItem_IN_time’ and ‘SubPlayItem_OUT_time’ fields indicating the presentation in time and presentation out time that define the playback or reproduction interval of the clip stream files associated with the subplayitem. Accordingly, when the ‘SubPlayItem_type’ field indicates the subplayitem is associated with text subtitles, the presentation interval defines the same playback time for each of the text subtitles referenced by the subplayitem. For each text subtitle provided by the ‘number_of_text_subtitles’ field, the subplayitem provides a clip information filename.
  • the clip information filename provides either a name of a clip information file that indicates a clip of a text subtitle stream or directly indicates the name of the clip of a text subtitle stream.
  • FIG. 15 illustrates a sixth embodiment of a data structure according to the present invention.
  • an additional text subtitle management information data structure is used to link a plurality of text subtitle streams to the main A/V stream.
  • one movie object or Java object is associated with a playlist.
  • One playitem of the playlist is associated with clip information on the main A/V stream.
  • a single subplayitem belonging to the playlist is linked to the text subtitle management information.
  • the text subtitle management information is, in turn, associated with a plurality of clip information, each corresponding uniquely to one of the plurality of text subtitle streams of different languages (stream # 1 for English and stream # 2 for Korean in this example).
  • a text subtitle management information layer is added to manage the text subtitle streams.
  • the text subtitle management information is referenced based on the subplayitem in the playlist layer.
  • Each playlist includes a single subplayitem associated with the text subtitle management information.
  • another subplayitem may be included for linking an audio stream.
  • the clip filename associated with the subplayitem_ may be represented by the URL representation scheme.
  • the clip information of the text subtitle streams may also be included in the clip information corresponding to the main A/V stream.
  • FIG. 16 illustrates an example of the data structure of a subplayitem and the text subtitle management information according this embodiment of the present invention.
  • the subplayitem syntax includes, among other things, a ‘length’ field indicating the length of the subplayitem, a ‘Clip_Information_file_name’ field for storing the text subtitle management information filename, a ‘SubPlayItem_type’ field for indicating whether or not the subplayitem is associated with text subtitle streams (for example, the SubPlayItem_type is set to 3 to indicate text subtitle streams), the ‘SubPlayItem_IN_time’ and ‘SubPlayItem_OUT_time’ fields as described in the previous embodiments, and an ‘Application’ field as described in the previous embodiments.
  • the syntax of text subtitle management information includes, among other things, a ‘number_of_text_subtitles’ field for representing the number of text subtitles, an ‘is_seamless_text_subtitle change’ field for indicating if seamless change between text subtitle streams is possible or not, and an ‘Application’ field as described in previous embodiments.
  • the subplayitem For each text subtitle provided by the ‘number_of_text_subtitles’ field, the subplayitem provides a clip information filename.
  • the clip information filename provides either a name of a clip information file that indicates a clip of a text subtitle stream or directly indicates the name of the clip of a text subtitle stream.
  • the ‘Application’ field is included either in the subplayitem syntax or in the text subtitle management information syntax.
  • FIG. 17 illustrates a seventh embodiment of a data structure according to the present invention.
  • an additional text subtitle management information data structure is associated with an object in the object layer, and is used to link a plurality of text subtitle streams to the main A/V stream.
  • a movie object or Java object is associated with a playlist, and one playitem belonging to the playlist is associated with clip information on the main A/V stream.
  • the clip filename of the movie object or Java object may be represented by the URL representation scheme.
  • the movie object or Java object is also directly linked to the text subtitle management information.
  • the text subtitle management information is, in turn, associated with a plurality of clip information, each corresponding uniquely to one of the plurality of text subtitle streams of different languages (stream # 1 for English and stream # 2 for Korean in this example).
  • the text subtitle management information is defined in the object layer, and therefore the plurality of the text subtitle streams are managed in the text subtitle management information layer.
  • the text subtitle management information has the same syntax as described above with respect to FIG. 16 .
  • FIG. 18 illustrates an eighth embodiment of a data structure according to the present invention.
  • an additional text subtitle management information data structure included in the movie object or Java object is used to link a plurality of text subtitle streams to the main A/V stream.
  • a movie object or Java object is associated with a playlist, and one playitem belonging to the playlist is associated with clip information on the main A/V stream.
  • the movie object or Java object is directly associated with a plurality of clip information, each corresponding uniquely to one of the plurality of text subtitle streams of different languages (stream # 1 for English and stream # 2 for Korean in this example).
  • the text subtitle management information is referenced and the plurality of text subtitle streams are managed in the object layer.
  • the clip filename in the movie object or Java object may be represented by the URL representation scheme.
  • FIG. 19 illustrates an example of the data structure the text subtitle management information according this embodiment of the present invention.
  • the syntax of text subtitle management information includes, among other things, a ‘number_of_text_subtitles’ field for representing the number of text subtitles, and an ‘is_seamless_text_subtitle_change’ field for indicating if seamless change between text subtitle streams is possible or not.
  • the subplayitem For each text subtitle provided by the ‘number_of_text_subtitles’ field, the subplayitem provides a ‘Clip_Information_file_name’ field, a ‘Target_PlayList’ field, a ‘Target_PlayItem’ field and an ‘Application’ field.
  • the clip information filename provides either a name of a clip information file that indicates a clip of a text subtitle stream or directly indicates the name of the clip of a text subtitle stream.
  • the ‘Application’ field is the same as described in previous embodiments.
  • the ‘Target_PlayList’ and ‘Target_PlayItem’ fields are for storing index information of the playlists and/or playitems that are associated in one-to-one correspondence with the plurality of text subtitle streams.
  • FIG. 20 illustrates another example embodiment of the data structure for the text subtitle management information.
  • the syntax of the text subtitle management information according to this embodiment is the same as in FIG. 19 except that for each text subtitle stream indicated by the ‘number_of_text_subtitles’ field, the syntax may further include a ‘Source_Clip_file_URL’ field for storing location information of the text subtitle streams; for example, a directory in the high-density optical disc or a URL address on the world wide web.
  • FIG. 21 illustrates an optical disc reproducing apparatus according to an embodiment of the present invention.
  • the apparatus includes an optical pickup 11 for reading out data from a BD-ROM 10 ; a source stream switch 12 ; a memory 13 ; a Java processor 14 ; a text subtitle processor 15 ; a first demultiplexer (demux) 16 ; a second demultiplexer (demux) 17 ; a presentation graphic source switch 18 ; a font engine 19 ; an interactive graphic decoder 20 ; a presentation graphic decoder 21 ; a video decoder 22 ; an interactive graphic data switch 23 ; a presentation graphic data selector 24 ; an interactive graphic plane 25 ; a presentation graphic plane 26 ; a video plane 27 ; a background plane 28 ; several mixers 29 , 30 , 31 , and a microcomputer 32 .
  • the optical disc reproducing apparatus may be connected to a CP sever 300 through the internet 200 .
  • the CP server 300 supplies bitmap subtitle streams or text subtitle streams that may be in the MPEG2 TS stream format or a predetermined binary stream of XML format.
  • the navigation data described before with reference to FIGS. 5-19 is read out from the BD-ROM 10 .
  • the microcomputer 32 Based on the navigation data to link the text subtitle streams to the main A/V streams, the microcomputer 32 performs a series of control operations to reproduce the text subtitle stream that is read out from the BD-ROM and/or supplied from the CP server 300 during reproduction of the main A/V stream.
  • the text subtitle stream from the CP server 300 may be a multiplexed stream of multiple language text subtitle streams only or a multiplexed stream of text subtitle streams and audio streams.
  • the bitmap or text subtitle streams supplied from the CP server 300 are uploaded to memory 13 , which is a HDD, RAM, flash memory, etc.
  • a text subtitle stream recorded on a BD-ROM in the MPEG2 TS stream format separately from main A/V stream is read out from the BD-ROM and may then be uploaded to the memory 13 .
  • the text subtitle stream is then supplied to the text subtitle processor 15 through the source stream switch 12 and the second demux 17 .
  • the text subtitle processor 15 may be configured as a component of the Java processor 14 or a separate text processor as shown.
  • font presentation graphic data are generated from the font engine 19 and then input to the presentation graphic data selector 24 .
  • Presentation graphic data corresponding to, e.g., a bitmap subtitle stream may also supplied to the presentation graphic data selector 24 from the memory 13 through the switch 12 , the first demux 16 or second demux 17 , the presentation graphic source switch 18 and the presentation graphic decoder 21 .
  • the presentation graphic decoder 21 decodes the presentation graphic data.
  • the presentation graphic data selector 24 in one embodiment selectively chooses one of the presentation graphic data from the font engine 19 (text subtitle graphic data) or from the presentation graphic decoder 21 (bitmap subtitle graphic data), and supplies this data to the presentation graphic plane 26 .
  • reproduced background data (if any) is supplied by the switch 12 to a background plane 28
  • reproduced A/V data is supplied by the switch 12 to the video decoder 22 via the first demux 16 .
  • the video decoder 22 decodes the A/V data.
  • the mixer 29 mixes the decoded A/V data with the background data (if any).
  • the mixer 30 mixes the output of the mixer 29 with the output from the presentation graphic plane 26 .
  • bitmap subtitles or text subtitles may be displayed together with main video pictures.
  • both the text subtitle stream and the bitmap subtitle stream may be supplied from the CP server 300 .
  • the text subtitle stream is uploaded to the memory 13 and then supplied directly to the text subtitle processor 15 bypassing the second demux 17 .
  • font presentation graphic data are generated from the font engine 19 and then input to the presentation graphic data selector 24 .
  • presentation graphic data from the font engine 19 text subtitle graphic data
  • presentation graphic decoder 21 bitmap subtitle graphic data
  • the output of the presentation graphic data selector 24 is supplied to the presentation graphic plane 26 so that either bitmap subtitles or text subtitles may be displayed together with main video pictures. This is accomplished by mixer 30 which mixes the output from mixer 29 and the presentation graphics plane 26 .
  • both or either of the text subtitle stream and bitmap subtitle streams may be supplied from the CP server 300 .
  • Interactive graphic data such as menu selector button are supplied to the interactive graphic decoder 20 through the demux 16 , and the output of the interactive graphic decoder 20 is input to the interactive graphic data switch 23 .
  • Interactive graphic data may also be supplied from the Java processor 14 and/or the font engine 19 , and are input to the interactive graphic data switch 23 .
  • the interactive graphic data switch 23 determines which input is chosen as an output to the interactive graphic plane 25 .
  • the output from the interactive graphics plane 25 is then mixed by mixer 31 with the output from mixer 30 .
  • the interactive graphic data selector 24 may be implemented as a switch or as a mixer, as shown in FIGS. 22 and 23 , respectively.
  • the mixer embodiment enables the two subtitles to be displayed simultaneously on non-overlapping regions of a screen.
  • a text presentation plane 40 may be additionally used as shown in FIG. 24 so as to display the text subtitle supplied from the font engine 19 .
  • this embodiment also uses an additional mixer to mix the output from the text presentation plane 40 and the mixer 31 .
  • the text subtitles and bitmap subtitles may be displayed independently of each other.
  • the present invention provides a recording medium having a data structure for managing the reproduction of text subtitle data, and provides methods and apparatuses for recording the data structure on the recording medium.

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  • Management Or Editing Of Information On Record Carriers (AREA)
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