WO2005036550A1 - Recording medium having data structure for managing reproduction of text subtitle and recording and reproducing methods and apparatuses - Google Patents

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

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Publication number
WO2005036550A1
WO2005036550A1 PCT/KR2004/002054 KR2004002054W WO2005036550A1 WO 2005036550 A1 WO2005036550 A1 WO 2005036550A1 KR 2004002054 W KR2004002054 W KR 2004002054W WO 2005036550 A1 WO2005036550 A1 WO 2005036550A1
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WO
WIPO (PCT)
Prior art keywords
text subtitle
file
text
recording medium
stream
Prior art date
Application number
PCT/KR2004/002054
Other languages
French (fr)
Inventor
Jea Yong Yoo
Byung Jin Kim
Kang Soo Seo
Original Assignee
Lg Electronics Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=36499776&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2005036550(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to BRPI0415436-3A priority Critical patent/BRPI0415436A/en
Priority to JP2006535258A priority patent/JP4654191B2/en
Priority to DE602004027935T priority patent/DE602004027935D1/en
Priority to AT04774324T priority patent/ATE472799T1/en
Priority to EP04774324A priority patent/EP1676275B1/en
Priority to CN2004800300922A priority patent/CN1867992B/en
Priority to KR1020067007083A priority patent/KR101102397B1/en
Publication of WO2005036550A1 publication Critical patent/WO2005036550A1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/102—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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1289—Formatting of user data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2541—Blu-ray discs; Blue laser DVR discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • 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
    • H04N9/82—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

Definitions

  • the present invention relates to high density recording media such as optical discs, and in particular, blu-ray read-only discs.
  • high density recording media such as optical discs, and in particular, blu-ray read-only discs.
  • DVD digital versatile disc
  • Subtitle data that is to be displayed on screen as characters or logo during playback of video data (e.g., a movie) is generally recorded on a DVD in the bitmapped format .
  • a recording medium includes a data structure for managing reproduction of text subtitle data.
  • the recording medium stores a main file and at least one separate text file.
  • the main file includes multiplexed audio and video data streams
  • the text subtitle file includes a single text subtitle stream.
  • the text subtitle file stores the text subtitle stream as transport packets, and each transport packet in the text subtitle stream has a same packet identifier.
  • the main file also stores the multiplexed audio and video data streams as transport packets.
  • the packet identifier of the text subtitle stream is distinguishable from packet identifiers for the transport packets in the main file.
  • the main file includes multiplexed audio data, video data and bitmap streams.
  • the bitmap stream is a bitmap subtitle stream.
  • the present invention further provides apparatuses and methods for recording and reproducing the data structure according to the present invention.
  • the method includes 'loading, from the recording medium, a text subtitle file into memory before decoding of a text subtitle stream included in the text subtitle file.
  • the text subtitle file is stored separately from a main file on the recording medium.
  • the main file includes multiplexed audio and video data streams, and the text subtitle file includes a single text subtitle stream.
  • An example apparatus includes at least a pick-up, a memory and a text processor. The pick-up is for reproducing at least one text subtitle file from the recording medium; the text subtitle file being stored separately from a main file on the recording medium.
  • the main file includes multiplexed audio and video data streams
  • the text subtitle file includes a single text subtitle stream.
  • the memory is for storing the reproduced text subtitle file
  • the text processor is for decoding the text subtitle stream stored in the memory. 4.
  • Figs. 1 to 6 illustrate embodiments of the present invention showing various configurations of bitmap- formatted subtitle stream and text-form subtitle stream on a BD-ROM; Figs.
  • FIG. 7 to 12 illustrate embodiments of the present invention showing different writing schemes of a plurality of text subtitle streams separately from a main A/V stream
  • Fig. 13 illustrates a block diagram of an embodiment of the optical disc reproducing apparatus according to the present invention
  • Figs. 14 to 16 illustrate block diagrams of embodiments of partial components of the optical disc reproducing apparatus according to the present invention. 5.
  • MODES FOR CARRYING OUT THE INVENTION In order that the invention may be fully understood, exemplary embodiments thereof will now be described with reference to the accompanying drawings.
  • an optical disc such as blu-ray read-only disc
  • subtitle data is recorded thereon so as to provide the subtitles associated with main audio and video (A/V) data.
  • the subtitle data is bitmap-formatted or in text form (e.g., character codes) .
  • bitmap subtitle data and text subtitle data may be recorded on the optical disc, or either, or neither.
  • the subtitle data may be multiplexed with the main A/V data.
  • the bitmap subtitle data or text subtitle data may be supplied from a content provider server (CP server) through networks such as the internet.
  • CP server content provider server
  • the text subtitle data from the CP server is transmitted in the MPEG2 transport stream (TS) format or extensible markup language (XML) format.
  • a plurality of the text subtitle data may be sent from the CP server so as to supply subtitles for several different language.
  • another type of data stream such as an audio stream may be supplied from the CP server together with the subtitle data.
  • the text subtitle data and bitmap subtitle data may be organized on a BD-ROM in different ways, which will be described hereinafter in detail. In a first embodiment shown in Fig. 1, both a bitmap subtitle stream and a text subtitle stream are recorded on a BD-ROM as a main subtitle and an auxiliary subtitle, respectively.
  • the bitmap subtitle stream is multiplexed with a main A/V stream and then recorded as a main MPEG2 TS clip file on the BD-ROM.
  • the text subtitle stream is recorded as a text subtitle file separately from the main MPEG2 TS clip file.
  • the text subtitle stream is uploaded on to a hard disk drive (HDD) or other memory such as a RAM, flash memory, etc., and is then decoded by a text processor (discussed in detail below with respect to Fig. 13) .
  • the text subtitle stream may be decoded directly by the text processor without uploading.
  • the bitmap subtitle stream is recorded on the BD-ROM in a transport packet (TP) format, where the transport packets have a unique packet ID (PID) distinguishable from the PIDs of the main A/V stream.
  • TP transport packet
  • PID packet ID
  • the text subtitle and the bitmap subtitle may be used for subtitles of different languages such as Korean and English. While seamless reproduction between the bitmap subtitle and the text subtitle is possible, whether seamless reproduction between the text subtitle streams may be supported or not depends on the optical reproducing apparatus .
  • both a bitmap subtitle stream and a text subtitle stream are recorded on a BD-ROM in such a way that both streams are multiplexed with the main A/V stream and then recorded as a main MPEG2 TS clip file on the BD-ROM. Both streams are recorded on the BD-ROM in a TP format.
  • the transport packets of each stream have a unique PID distinguishable from PIDs of the main A/V stream.
  • both streams are directly decoded by a text processor without loading into memory in the optical reproducing apparatus.
  • the text subtitle and the bitmap subtitle streams may be used for different languages such as Korean and English.
  • the main A/V stream is recorded on a BD-ROM, for example, as a main MPEG2 TS clip file without the bitmap subtitle and the text subtitle stream being multiplexed therewith.
  • the text subtitle stream is recorded as a text subtitle file separately from this main file.
  • the text subtitle stream is uploaded on a hard disk drive (HDD) , or other memory such as a RAM, flash memory, etc., and then decoded by a text processor.
  • the text subtitle stream may be decoded directly by the text processor without uploading.
  • HDD hard disk drive
  • the ' text subtitle streams for different languages such as Korean and English may be recorded as distinct text subtitle files (text subtitle files #1 and #2, shown in Fig. 3) , or may be recorded as distinct streams within a text subtitle file such that seamless reproduction between text subtitle streams of different languages may be performed.
  • the text subtitle stream only is multiplexed with a main A/V stream and then recorded as a main MPEG2 TS clip file on a BD-ROM.
  • the text subtitle stream is recorded in a TP format, where the packets have PIDs distinguishable from the PIDs of the main A/V stream.
  • the text subtitle stream is directly decoded by a text processor without loading into a memory in the optical reproducing apparatus. As shown in Fig.
  • the text subtitle streams for different languages have distinct PIDs such that seamless reproduction between the text subtitle streams of different languages may be performed.
  • the bitmap subtitle stream only is multiplexed with a main A/V stream and then recorded as a main MPEG2 TS clip file on a BD-ROM.
  • the bitmap subtitle stream is recorded in a " TP format, where the packets have a unique PID distinguishable from the PIDs of the main A/V stream.
  • a text subtitle stream is supplied as a separate text subtitle file from a CP server that is connected via networks such as the internet to the reproducing apparatus (an example of which is described in detail below with respect to Fig. 12) .
  • the text subtitle stream is uploaded on a hard disk drive (HDD) or other memory such as a RAM, flash memory, etc. and then decoded by a text processor.
  • HDD hard disk drive
  • the bitmap subtitle stream and text subtitle stream may be reproduced seamlessly.. It depends on the optical reproducing apparatus whether or not seamless reproduction between the text subtitle streams may be supported.
  • the bitmap subtitle stream only is multiplexed with a main A/V stream and then recorded as a main MPEG2 TS clip file on a BD-ROM.
  • the bitmap subtitle stream is recorded in a TP format, where the packets have a PID distinguishable from the PIDs of the main A/V stream.
  • a text subtitle stream is supplied as a separate text subtitle file from a CP server that is connected via networks such as the internet to the reproducing apparatus.
  • another bitmap subtitle stream is supplied from the CP server as a separate bitmap subtitle file.
  • the streams are uploaded on a hard disk drive (HDD) or other memory such as a RAM, flash memory, etc. and then decoded by a text processor.
  • the bitmap subtitle stream on the BD-ROM and the bitmap and text subtitle streams from the CP server may be used for the subtitles of different languages such as Korean, English, and Chinese, and may reproduced seamlessly, as shown in Fig. 6.
  • bitmap subtitle ' streams and the text subtitle streams may be supplied from both a BD-ROM and a CP server.
  • a plurality of the text subtitle streams may also be written on a BD-ROM in various ways and the writing formats will be described below in detail .
  • a plurality of text subtitle streams (text subtitle streams #1 to #n) are multiplexed with each other and are then written as a single MPEG2 TS stream clip file.
  • Each text subtitle stream has a unique PID so that each stream may be distinguished from each other.
  • the single MPEG2 TSP clip file may contain the total text subtitle streams or some text subtitles that need to be uploaded or downloaded.
  • a plurality of text subtitle streams are written as individual files, each being in accordance with either the MPEG2 TS stream format or non- MPEG2 TS format such as XML. In either case, each text subtitle stream is distinguishable and chosen selectively by referencing the corresponding text subtitle files so as to determine text subtitle streams to be uploaded or downloaded.
  • a portion of a plurality of the text subtitle streams are multiplexed with each other and are then written as a single MPEG2 TS stream file.
  • Each text subtitle stream has a unique PID so that each stream may be distinguished from the other.
  • the other portions of the plurality of the text subtitle streams are written as individual MPEG2 TS stream files without insertion of unique PIDs.
  • a plurality of the text subtitle streams (text subtitle streams #1 to #n) are written as a single non-MPEG2 TS file Each text subtitle stream may. be organized separately or intermixed within the non-MPEG2 TS file.
  • a portion of a plurality of the text subtitle streams (text subtitle streams #1 to #(n-2)) are multiplexed with each other and are then written as a single non-MPEG2 TS file.
  • the other portion of the plurality of the text subtitle streams are written as individual non-MPEG2 TS files, separately.
  • a plurality of the text subtitle streams are multiplexed with the audio or bitmap subtitle streams and then written as a single MPEG2 TS stream clip file.
  • a user can choose subtitle and audio selection in any combination desired, for example, Korea sound and Korean text or bitmap subtitle, English audio and Korean text or bitmap subtitle for English listening practice, or English text subtitle and Korean bitmap subtitle for multiple language subtitles.
  • 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; and several mixers 29, 30, 31.
  • 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 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 are uploaded to memory 13, which is a HDD, RAM, flas.h memory, etc. The decoding process of the bitmap and text subtitle streams will be described below in detail.
  • 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, and reproduced A/V data is suppli.ed 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. In this manner, either 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
  • 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.
  • 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. 16 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 subtitle data, and provides methods and apparatuses for recording the data structure on the recording medium.

Abstract

In the data structure for managing reproduction of text subtitle data, a recording area stores a main file and at least one separate text file. The main file includes multiplexed audio and video data streams, and the text subtitle file includes a single text subtitle stream.

Description

D E S C R I P T I O N
RECORDING MEDIUM HAVING DATA STRUCTURE FOR MANAGING REPRODUCTION OF TEXT SUBTITLE AND RECORDING AND REPRODUCING METHODS AND APPARATUSES
1. TECHNICAL FIELD The present invention relates to high density recording media such as optical discs, and in particular, blu-ray read-only discs. 2. BACKGROUND ART Optical discs that are capable of storing large amounts of high-quality video and audio data, have been available on the market. The digital versatile disc (DVD) is one example of such an optical disc. Recently, DVD players and DVD recorders have been available on the market and have become one of the most popular consumer electronic products . Subtitle data that is to be displayed on screen as characters or logo during playback of video data (e.g., a movie) is generally recorded on a DVD in the bitmapped format . While the main video data recorded on the DVD is reproduced, the bitmap-formatted subtitle data is read out from the DVD and output to an' external display device such as a TV after a series of signal processing steps so that the bitmap subtitle is displayed on the screen of the external device. In this way, a user can watch subtitles or logo on the screen of a TV during playback of a DVD title. Recently, the standardization of new higher density optical discs; for example, blu-ray read-only disc (BD-ROM) has been under development. An effective method of reproducing the subtitles recorded on a BD-ROM in a various ways has not been established. 3. DISCLOSURE OF INVENTION A recording medium according to the present invention includes a data structure for managing reproduction of text subtitle data. In one embodiment, the recording medium stores a main file and at least one separate text file. The main file includes multiplexed audio and video data streams, and the text subtitle file includes a single text subtitle stream. In one embodiment, the text subtitle file stores the text subtitle stream as transport packets, and each transport packet in the text subtitle stream has a same packet identifier. In another embodiment, the main file also stores the multiplexed audio and video data streams as transport packets. Here, the packet identifier of the text subtitle stream is distinguishable from packet identifiers for the transport packets in the main file. In a further embodiment, the main file includes multiplexed audio data, video data and bitmap streams. For example, in one embodiment, the bitmap stream is a bitmap subtitle stream. The present invention further provides apparatuses and methods for recording and reproducing the data structure according to the present invention. For example in a method of reproducing a recording medium having a data structure for managing a text subtitle, the method includes 'loading, from the recording medium, a text subtitle file into memory before decoding of a text subtitle stream included in the text subtitle file. Here, the text subtitle file is stored separately from a main file on the recording medium. The main file includes multiplexed audio and video data streams, and the text subtitle file includes a single text subtitle stream. An example apparatus includes at least a pick-up, a memory and a text processor. The pick-up is for reproducing at least one text subtitle file from the recording medium; the text subtitle file being stored separately from a main file on the recording medium. The main file includes multiplexed audio and video data streams, and the text subtitle file includes a single text subtitle stream. The memory is for storing the reproduced text subtitle file, and the text processor is for decoding the text subtitle stream stored in the memory. 4. BRIEF DESCRIPTION OF DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention, illustrate the exemplary embodiments of the invention, and together with the description, serve to explain the principles of the present invention. In the drawings: Figs. 1 to 6 illustrate embodiments of the present invention showing various configurations of bitmap- formatted subtitle stream and text-form subtitle stream on a BD-ROM; Figs. 7 to 12 illustrate embodiments of the present invention showing different writing schemes of a plurality of text subtitle streams separately from a main A/V stream; Fig. 13 illustrates a block diagram of an embodiment of the optical disc reproducing apparatus according to the present invention; and Figs. 14 to 16 illustrate block diagrams of embodiments of partial components of the optical disc reproducing apparatus according to the present invention. 5. MODES FOR CARRYING OUT THE INVENTION In order that the invention may be fully understood, exemplary embodiments thereof will now be described with reference to the accompanying drawings. For an optical disc such as blu-ray read-only disc
(BD-ROM) in accordance with the present invention, subtitle data is recorded thereon so as to provide the subtitles associated with main audio and video (A/V) data. The subtitle data is bitmap-formatted or in text form (e.g., character codes) . Hereinafter, these two types of subtitle data will be referred to as bitmap subtitle data and text subtitle data, respectively. Both bitmap subtitle data and text subtitle data may be recorded on the optical disc, or either, or neither. Before being recorded on the optical disc, the subtitle data may be multiplexed with the main A/V data. The bitmap subtitle data or text subtitle data may be supplied from a content provider server (CP server) through networks such as the internet. The text subtitle data from the CP server is transmitted in the MPEG2 transport stream (TS) format or extensible markup language (XML) format. A plurality of the text subtitle data may be sent from the CP server so as to supply subtitles for several different language. Moreover, another type of data stream such as an audio stream may be supplied from the CP server together with the subtitle data. According to the present invention, the text subtitle data and bitmap subtitle data may be organized on a BD-ROM in different ways, which will be described hereinafter in detail. In a first embodiment shown in Fig. 1, both a bitmap subtitle stream and a text subtitle stream are recorded on a BD-ROM as a main subtitle and an auxiliary subtitle, respectively. The bitmap subtitle stream is multiplexed with a main A/V stream and then recorded as a main MPEG2 TS clip file on the BD-ROM. On the other hand, the text subtitle stream is recorded as a text subtitle file separately from the main MPEG2 TS clip file. When reproduced, the text subtitle stream is uploaded on to a hard disk drive (HDD) or other memory such as a RAM, flash memory, etc., and is then decoded by a text processor (discussed in detail below with respect to Fig. 13) . Or, the text subtitle stream may be decoded directly by the text processor without uploading. The bitmap subtitle stream is recorded on the BD-ROM in a transport packet (TP) format, where the transport packets have a unique packet ID (PID) distinguishable from the PIDs of the main A/V stream. As shown in Fig. 1, the text subtitle and the bitmap subtitle may be used for subtitles of different languages such as Korean and English. While seamless reproduction between the bitmap subtitle and the text subtitle is possible, whether seamless reproduction between the text subtitle streams may be supported or not depends on the optical reproducing apparatus . In a second embodiment shown in Fig. 2, both a bitmap subtitle stream and a text subtitle stream are recorded on a BD-ROM in such a way that both streams are multiplexed with the main A/V stream and then recorded as a main MPEG2 TS clip file on the BD-ROM. Both streams are recorded on the BD-ROM in a TP format. The transport packets of each stream have a unique PID distinguishable from PIDs of the main A/V stream. When reproduced, both streams are directly decoded by a text processor without loading into memory in the optical reproducing apparatus. As shown in Fig. 2, the text subtitle and the bitmap subtitle streams may be used for different languages such as Korean and English. While seamless reproduction between the bitmap subtitle and the text subtitle is possible, whether seamless reproduction between the text subtitle streams may be supported or not depends on the optical reproducing apparatus. In a third embodiment shown in Fig. 3, the main A/V stream is recorded on a BD-ROM, for example, as a main MPEG2 TS clip file without the bitmap subtitle and the text subtitle stream being multiplexed therewith. The text subtitle stream is recorded as a text subtitle file separately from this main file. When reproduced, the text subtitle stream is uploaded on a hard disk drive (HDD) , or other memory such as a RAM, flash memory, etc., and then decoded by a text processor. Or, the text subtitle stream may be decoded directly by the text processor without uploading. As shown in Fig. 3, the 'text subtitle streams for different languages such as Korean and English may be recorded as distinct text subtitle files (text subtitle files #1 and #2, shown in Fig. 3) , or may be recorded as distinct streams within a text subtitle file such that seamless reproduction between text subtitle streams of different languages may be performed. In a fourth embodiment shown in Fig. 4, the text subtitle stream only is multiplexed with a main A/V stream and then recorded as a main MPEG2 TS clip file on a BD-ROM. The text subtitle stream is recorded in a TP format, where the packets have PIDs distinguishable from the PIDs of the main A/V stream. When reproduced, the text subtitle stream is directly decoded by a text processor without loading into a memory in the optical reproducing apparatus. As shown in Fig. 4, the text subtitle streams for different languages have distinct PIDs such that seamless reproduction between the text subtitle streams of different languages may be performed. In a fifth embodiment shown in Fig. 5, the bitmap subtitle stream only is multiplexed with a main A/V stream and then recorded as a main MPEG2 TS clip file on a BD-ROM. The bitmap subtitle stream is recorded in a "TP format, where the packets have a unique PID distinguishable from the PIDs of the main A/V stream. In this embodiment, a text subtitle stream is supplied as a separate text subtitle file from a CP server that is connected via networks such as the internet to the reproducing apparatus (an example of which is described in detail below with respect to Fig. 12) . To be reproduced, the text subtitle stream is uploaded on a hard disk drive (HDD) or other memory such as a RAM, flash memory, etc. and then decoded by a text processor. As shown in Fig. 5, the bitmap subtitle stream and text subtitle stream, each having different languages, may be reproduced seamlessly.. It depends on the optical reproducing apparatus whether or not seamless reproduction between the text subtitle streams may be supported. In a sixth embodiment shown in Fig. 6, the bitmap subtitle stream only is multiplexed with a main A/V stream and then recorded as a main MPEG2 TS clip file on a BD-ROM. The bitmap subtitle stream is recorded in a TP format, where the packets have a PID distinguishable from the PIDs of the main A/V stream. In this embodiment, a text subtitle stream is supplied as a separate text subtitle file from a CP server that is connected via networks such as the internet to the reproducing apparatus. Beside the text subtitle stream, another bitmap subtitle stream is supplied from the CP server as a separate bitmap subtitle file. For the subtitle streams from the CP server to be reproduced, the streams are uploaded on a hard disk drive (HDD) or other memory such as a RAM, flash memory, etc. and then decoded by a text processor. The bitmap subtitle stream on the BD-ROM and the bitmap and text subtitle streams from the CP server may be used for the subtitles of different languages such as Korean, English, and Chinese, and may reproduced seamlessly, as shown in Fig. 6. Other embodiments of the present invention may be created from combinations of the foregoing embodiments. For example, the bitmap subtitle 'streams and the text subtitle streams may be supplied from both a BD-ROM and a CP server. A plurality of the text subtitle streams may also be written on a BD-ROM in various ways and the writing formats will be described below in detail . As shown in Fig. 7, a plurality of text subtitle streams (text subtitle streams #1 to #n) are multiplexed with each other and are then written as a single MPEG2 TS stream clip file. Each text subtitle stream has a unique PID so that each stream may be distinguished from each other. The single MPEG2 TSP clip file may contain the total text subtitle streams or some text subtitles that need to be uploaded or downloaded. According to the writing formats of Fig. 8, a plurality of text subtitle streams (text subtitle streams #1 to #n) are written as individual files, each being in accordance with either the MPEG2 TS stream format or non- MPEG2 TS format such as XML. In either case, each text subtitle stream is distinguishable and chosen selectively by referencing the corresponding text subtitle files so as to determine text subtitle streams to be uploaded or downloaded. According to the writing formats of Fig. 9, a portion of a plurality of the text subtitle streams (text subtitle streams #1 to #(n-2)) are multiplexed with each other and are then written as a single MPEG2 TS stream file. Each text subtitle stream has a unique PID so that each stream may be distinguished from the other. The other portions of the plurality of the text subtitle streams (text subtitle streams #(n-l) to #n) are written as individual MPEG2 TS stream files without insertion of unique PIDs. According to the writing formats of Fig. 10, a plurality of the text subtitle streams (text subtitle streams #1 to #n) are written as a single non-MPEG2 TS file Each text subtitle stream may. be organized separately or intermixed within the non-MPEG2 TS file. According to the writing formats of Fig. 11, a portion of a plurality of the text subtitle streams (text subtitle streams #1 to #(n-2)) are multiplexed with each other and are then written as a single non-MPEG2 TS file. The other portion of the plurality of the text subtitle streams (text subtitle streams #(n-l) to #n) are written as individual non-MPEG2 TS files, separately. According to the writing formats of Fig. 12, when one or more audio or bitmap subtitle streams need to be reproduced together with text* subtitle streams, a plurality of the text subtitle streams (text subtitle streams #1 to #n) are multiplexed with the audio or bitmap subtitle streams and then written as a single MPEG2 TS stream clip file. In this case, a user can choose subtitle and audio selection in any combination desired, for example, Korea sound and Korean text or bitmap subtitle, English audio and Korean text or bitmap subtitle for English listening practice, or English text subtitle and Korean bitmap subtitle for multiple language subtitles. Fig. 13 illustrates an optical disc reproducing apparatus according to an embodiment of the present invention. As shown, 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; and several mixers 29, 30, 31. 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 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 are uploaded to memory 13, which is a HDD, RAM, flas.h memory, etc. The decoding process of the bitmap and text subtitle streams will be described below in detail. 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. Based on the text subtitle stream processed by the text subtitle processor 15, 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. As will be appreciated, 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. Meanwhile, reproduced background data (if any) is supplied by the switch 12 to a background plane 28, and reproduced A/V data is suppli.ed 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. In this manner, either bitmap subtitles or text subtitles may be displayed together with main video pictures. As alluded to before, both the text subtitle stream and the bitmap subtitle stream may be supplied from the CP server 300. When a text subtitle stream has been recorded on a
BD-ROM in a predefined binary format such as XML, 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. Based on the output of the text subtitle processor 15, font presentation graphic data are generated from the font engine 19 and then input to the presentation graphic data selector 24. Here, either presentation graphic data from the font engine 19 (text subtitle graphic data) or from the presentation graphic decoder 21 (bitmap subtitle graphic data) is chosen selectively as output. 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 Also, 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. 14 and 15, respectively. To be specific, while a text subtitle and a bitmap subtitle may not be displayed simultaneously if the switch embodiment is adopted, the mixer embodiment enables the two subtitles to be displayed simultaneously on non-overlapping regions of a screen. Furthermore, instead of using the interactive graphic data selector 24, a text presentation plane 40 may be additionally used as shown in Fig. 16 so as to display the text subtitle supplied from the font engine 19. As will be appreciated, this embodiment also uses an additional mixer to mix the output from the text presentation plane 40 and the mixer 31. In the configuration of Fig. 16, 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 subtitle data, and provides methods and apparatuses for recording the data structure on the recording medium. While the invention has been disclosed with respect to a limited number of embodiments, those skilled in the art, having the benefit of this disclosure, will appreciate numerous modifications and variations there from. For example, while described with respect to a Blu-ray ROM optical disk in several instances, the present invention is not limited to this standard of optical disk or to optical disks. It is intended that all such modifications and variations fall within the spirit and scope of the invention.

Claims

1. A recording medium having a data structure for managing a text subtitle, comprising: a recording area storing a main file and at least one separate text file, the main 'file including multiplexed audio and video data streams, and the text subtitle file including a single text subtitle stream.
2. The recording medium of claim 1, wherein the text subtitle file stores the text subtitle stream as transport packets.
3. The recording medium of claim 2, wherein each transport packet in the text subtitle stream has a same packet identifier.
4. The recording medium of claim 2, wherein the main file stores the multiplexed audio and video data streams as transport packets.
5. The recording medium of claim 2 , wherein each transport packet in the text subtitle file has a same packet identifier, and the packet identifier is distinguishable from packet identifiers for the transport packets in the main file.
6. The recording medium of claim 1, wherein the main file stores the multiplexed audio and video data streams as transport packets.
7. The recording medium of claim 1, wherein the recording area stores more than one text subtitle file, and each text subtitle file includes a single text subtitle stream.
8. The recording medium of claim 7, wherein one of the text subtitle files stores a text subtitle stream for one language text subtitle, and another of the text subtitle files stores a text subtitle stream for a different language text subti-tle.
9. The recording medium of claim 8, wherein the languages are Korean and English.
10. The recording medium of claim 7, wherein at least two of the text subtitle files store their respective text subtitle streams as transport packets.
11. A recording medium having a data structure for managing a text subtitle, comprising: a recording area storing a main file and at least one separate text file, the main file including multiplexed audio data, video data and bitmap streams, and the text subtitle file including a single text subtitle stream.
12. The recording medium of claim 11, wherein the bitmap stream is a bitmap subtitle stream.
13. A method of reproducing a recording medium having a data structure for managing a text subtitle, comprising: loading a text subtitle file into memory before decoding of a text subtitle stream included in the text subtitle file, the text subtitle file being stored separately from a main file, the main file including multiplexed audio and video data ' streams , and the text subtitle file including a single text subtitle stream.
14. An apparatus for reproducing a recording medium, comprising : a pick up to reproduce at least one text subtitle file from the recording medium, the text subtitle file being stored separately from a main file on the recording medium, the main file including multiplexed audio and video data streams, and the text subtitle file including a single text subtitle stream; and a memory to store the reproduced text subtitle file; and a text processor to decode the text subtitle stream stored in the memory.
15. A method of recording a data structure for managing reproduction of a text subtitle on a recording medium, the method comprising: recording a main file and at least one separate text file on the recording medium, the main file including multiplexed audio and video data streams, and the text subtitle file including a single text subtitle stream.
16. A method of reproducing a data structure for managing reproduction of a text subtitle from a recording medium, comprising: reproducing a main file .and at least one separate text file from the recording medium, the main file including multiplexed audio and video data streams, and the text subtitle file including a single text subtitle stream.
17. An apparatus for reproducing a data structure for managing reproduction of text subtitle data from a recording medium, comprising: a pick-up to reproduce a main file and at least one separate text file from the recording medium, the main file including multiplexed audio and video data streams, and the text subtitle file including a single text subtitle stream.
18. A recording medium "having a data structure for managing a text subtitle, comprising: a recording area storing a main file and at least one separate text file, the main file including multiplexed audio and video data streams, the text subtitle file including a single text subtitle stream, the text subtitle file storing the text subtitle stream as transport packets, the main file storing the multiplexed audio and video data streams as transport packets, and each transport packet in the text subtitle file having a same packet identifier, and the packet identifier being distinguishable from packet identifiers for the transport packets in the main file.
19. A recording medium having a data structure for managing a text subtitle, comprising: a recording area storing a main file and more than one separate text file, the main file including multiplexed audio and video data streams, each text subtitle file including a single text subtitle stream, and at least two of the text subtitle files storing their respective text subtitle streams as transport packets.
PCT/KR2004/002054 2003-10-14 2004-08-17 Recording medium having data structure for managing reproduction of text subtitle and recording and reproducing methods and apparatuses WO2005036550A1 (en)

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BRPI0415436-3A BRPI0415436A (en) 2003-10-14 2004-08-17 recording medium having a data structure for managing the reproduction of subtitles in text and recording and playback methods and apparatus
JP2006535258A JP4654191B2 (en) 2003-10-14 2004-08-17 Recording medium having data structure for managing reproduction of text subtitle, and method and apparatus for recording and reproduction
DE602004027935T DE602004027935D1 (en) 2003-10-14 2004-08-17 RECORDING MEDIUM WITH A DATA STRUCTURE FOR MANAGING THE REPRODUCTION OF TEXT SUBTITLES AND RECORDING AND PLAYBACK PROCESSES AND DEVICES
AT04774324T ATE472799T1 (en) 2003-10-14 2004-08-17 RECORDING MEDIUM HAVING DATA STRUCTURE FOR MANAGING THE PLAYBACK OF TEXT SUBTITLES AND RECORDING AND PLAYBACKING METHODS AND APPARATUS
EP04774324A EP1676275B1 (en) 2003-10-14 2004-08-17 Recording medium having data structure for managing reproduction of text subtitle and recording and reproducing methods and apparatuses
CN2004800300922A CN1867992B (en) 2003-10-14 2004-08-17 Recording and reproduction method and device for managing reproduction of text subtitle
KR1020067007083A KR101102397B1 (en) 2003-10-14 2004-08-17 Recording medium having data structure for managing reproduction of text subtitle and recording and reproducing methods and apparatuses

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