KR20050094024A - Method for managing and reproducing a data file of high density optical disc and apparatus for the same - Google Patents

Abstract

The present invention relates to a high density optical disc, and more particularly, to a file structure for managing auxiliary data in a high density optical disc, and a method and apparatus for reproducing the same. According to the present invention, text subtitle clips composed of independent clips for each language are managed as one sub playitem in a playlist, and font information and sequence information of the text subtitle stream are clips of the text subtitle clip. Incorporation in the Clip Info area has the effect of more efficiently recording and reproducing the high density optical disc.

Description

Method for managing and reproducing a data file of high density optical disc and Apparatus for the same}

The present invention relates to a high density optical disc, and more particularly, to a file structure for managing auxiliary data in a high density optical disc, and a method and apparatus for reproducing the same.

As optical recording media, optical disks capable of recording large amounts of data are widely used. Among them, recently, a new high-density optical recording medium (HD-DVD) capable of recording and storing high-quality video data and high-quality audio data for a long time, for example, Blu-ray Disc (hereinafter referred to as 'BD'). ) Is being developed.

Blu-ray Disc (BD), the next-generation HD-DVD technology, is a next-generation optical recording solution that can store data that is significantly surpassing that of conventional DVDs.

In relation to the Blu-ray Disc (BD) standard, the development of the optical record player has also begun, but the Blu-ray Disc (BD) standard is not complete yet, it is difficult to develop a complete optical record player.

In particular, in order to efficiently reproduce the data recorded in the Blu-ray Disc (BD) as described above, not only the information about the configuration data file should be provided, but also the information for effectively configuring and managing the data file is organized. Should be provided.

However, in the current Blu-ray Disc (BD) standard, the configuration of the data file, in particular, the unified standard for the auxiliary data file among the files is not complete, and thus, a full-fledged Blu-ray Disc (BD) -based optical recorder is developed. There are a lot of restrictions on this situation, which will be particularly problematic in reproducing and providing the data stream to the user.

Accordingly, an object of the present invention is to solve the problems of the prior art, and to provide a method, a playback method, and a device for constructing a new auxiliary data file suitable for a high density optical disk such as a Blu-ray Disc (BD). The technical problem is as follows.

A method of configuring an auxiliary data file, particularly a text subtitle, among data recorded in an optical disc is provided as a systemized standardized information.

In addition, an object of the present invention is to provide a method and apparatus for efficiently reproducing an optical disc (BD) using the configured auxiliary data file.

In the data file construction method of the high density optical disc according to the present invention for achieving the above object, the text subtitle clips composed of independent clips for each language are managed as one sub playitem in the playlist, and the text sub The font information and the sequence information of the title stream may be included in a clip info area of the text subtitle clip.

A data reproducing method of a high density optical disc according to the present invention comprises the steps of: reading information of a corresponding playitem and a sub-playitem in a playlist file according to a reproduction request command for a specific title of a user, and included in the readout information. And reproducing the playitem and the subplayitem according to the font and sequence information regarding the text subtitle of the main data and the auxiliary data.

A data reproducing apparatus of a high density optical disc according to the present invention includes a memory for reading out and storing information of a corresponding playitem and a subplayitem in a playlist file according to a reproduction request command for a specific title of a user, and including the readout information in the readout information. And a controller for reproducing the playitem and the subplayitem according to the font and sequence information of the text subtitle of the main data and the supplementary data.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an auxiliary data configuration method of a high density optical disc according to the present invention will be described in detail with reference to the accompanying drawings. In addition, the terminology used in the present invention was selected as a general term that is widely used at present, but in some cases, the term is arbitrarily selected by the applicant, and in this case, since the meaning is described in detail in the corresponding part of the present invention, a simple term is used. It is to be understood that the present invention should be understood as meanings of terms other than names.

In this regard, the meaning of "main data" used in the present invention means video and audio data provided to a user by a disc author as a title information recorded in an optical disc, and is generally recorded in MPEG2 format. Also called "main AV stream."

In addition, the meaning of "auxiliary data" means all data related to main data provided to the user for the convenience of reproduction when the "main data" is reproduced, and includes an auxiliary audio stream and a pop-up menu ( PopUp menu, Click Sound, Interactive graphic stream interactive with the user, presentation graphics such as subtitle information or song lyrics, and subtitle streams that mean text subtitles stream).

Accordingly, the auxiliary data may be multiplexed and recorded in the main AV stream in the MPEG2 format according to the characteristics thereof, or may be recorded in the stream file independent of the main AV stream in the MPEG2 format or another format.

The meaning of the "subtitle" means that when a user wants to watch a video currently being played (main AV data) in a subtitle of a specific language, the user selects a subtitle of the corresponding language from among subtitles supported by the optical disc. It means a presentation graphic such as subtitles or song lyrics to be displayed, and the subtitles can be recorded in various formats, such as MPEG2 Transport (TS) packets. It is possible to record in binary format in the form of bit-map or text data, and in particular, a subtitle recorded as text data such as the subtitle information is referred to as a "text subtitle". Subtitle) ".

In relation to the present invention, a case in which the text subtitle is configured in the MPEG2 format and is recorded as a stream file independent of the main data will be described as an example.

Hereinafter, a recording format for recording the main data and the auxiliary data on a disc and a file structure for managing the same will be described in detail with reference to FIGS. 1 to 2.

  First, Fig. 1 is a diagram showing a file structure for managing data recorded in a disc according to the present invention.

As shown in FIG. 1, at least one BD directory BDMV exists under one root directory, and a general file for ensuring interactivity with a user in the BD directory BDMV. It is a four directory including the index file (index.bdmv) and the object file (MovieObject.bdmv) as information, and the information on the playback information on the data recorded on the actual disk and how to play it. , A playlist directory (PLAYLIST), a clip information directory (CLIPINF), a stream directory (STREAM), and an auxiliary data directory (AUX DATA).

Hereinafter, the four types of directories and files included therein will be described first. Next, a method of recording auxiliary data and management information for reproducing and managing the same in the optical disc file information will be described.

First, there are files for the main video and audio stream (main AV stream) recorded in a specific format in the disc in the stream directory STREAM. In some cases, an auxiliary data stream such as a text subtitle may exist. .

As mentioned above, the stream file is recorded as a transport packet of the MPEG2 scheme, which is widely known, and thus the extension of the stream file (01000.m2ts, 02000.m2ts) is " * .m2ts ".

In this case, according to a specific use case, in the case of the "text subtitle stream" recorded in the transport packet of the MPEG 2 system, the file extension is divided into "m2ts" and "* .txtst", and the stream directory (STREAM) is used. It can also be stored in an auxiliary data directory (AUX DATA).

In addition, the clip information directory (CLIPINF) is composed of Clip info files (* .clpi) corresponding to each stream (* .m2ts) files one-to-one. In particular, the clip information file (* .clpi) stores attribute information and timing information of a corresponding stream file, and among these information, an entry point map (hereinafter referred to as "EP_map") method The Presentation Time Stamp (PTS) and Source Packet Number (SPN) are one-to-one correspondences in a table form, and then to PlayItems or SubPlayItems, which will be described later. Mapping information for searching a specific position of a corresponding stream file (* .m2ts) from time information (In-Time, Out-Time PTS) provided by the search may be provided according to the type of clip. do.

As described above, a stream (* .m2ts) file and a clip info file (* .clpi) corresponding to each other are bundled together, and the BD standard calls it "clip." Therefore, the file "01000.clpi" in the clip info directory (CLIPINF) contains attribute information about the file "01000.m2ts" in the stream directory (STREAM), and the files "01000.clpi" and "01000.m2ts" You will make up a clip.

Further, the playlist directory PLAYLIST is composed of playlist files (* .mpls), each playlist file (* .mpls) having at least a playing interval for specifying a playing time of a particular clip. Contains one or more PlayItems.

Therefore, the PlayItem (PlayItem) is the playback start time (In-Time) and the playback end of the specific clip (Clip) specified by the clip name (Clip_Information_File_name) in the PlayItem (PlayItem) to be played back. It has time information on out-time, which has been used as mapping information in clip information (* .clpi).

As a result, the playlist file (* .mpls) becomes basic playback file information for playing back a desired combination of clips by combining at least one PlayItem (PlayItem).

Also, a playlist file (* .mpls) may include a subplayitem (SubPlayItem) for managing reproduction of auxiliary data. For example, a subplayitem (SubPlayItem) for playing a text subtitle is provided. In this case, the data is reproduced in synchronization with the PlayItem, and when a SubPlayItem for playing a browsable slide show is provided, the data is asynchronous with the PlayItem. -synchronized) to reproduce the data.

In the context of the present invention, an example of managing auxiliary data, in particular, a text subtitle as the subplayitem (SubPlayItem), will be described with reference to the following description.

The auxiliary data directory (AUX DATA) is data that is not multiplexed to the main data stream among the auxiliary data streams, and includes a font (aaaaa.font, aaaaa.otf), a popup menu (not shown), and a click sound ( Auxiliary data streams such as Click Sound (Sound.bdmv) are included, and auxiliary data such as audio information for a browsable slideshow are multiplexed into the main data stream and included in the stream directory STREAM.

In addition, an index file (index.bdmv) and an object file (MovieObject.bdmv) exist in the above-described BD directory (BDMV) as a general file for ensuring interactivity with a user. (index.bdmv) mainly consists of an index table, and a user selectable menu information and title information are provided in the index table.

Meanwhile, FIG. 2 is a diagram briefly illustrating a form in which information related to the file structure according to the present invention is recorded in a disc.

As shown in Fig. 2, a file system information area (File System Information Area) and a play list file and a clip information file for reproducing the recorded stream (* .m2ts) file as system information for managing the entire file from the inner circumference of the disc. And main data and auxiliary data such as an area where an index file (index.bdmv), an object file (MovieObject.bdmv) is recorded (also referred to as a "Database Area"), and audio / video / graphics as a parent file (regular file) There is a recorded stream file area.

Accordingly, the user determines and utilizes main data and auxiliary data to be reproduced and reproduction methods thereof through file information in the database area and / or stream management information in the stream file area. Done.

Hereinafter, a method of newly defining management information for reproducing auxiliary data, particularly text subtitle data according to the present invention, recording it as disk file information, and a method of reproducing auxiliary data using the recorded management information will be described in detail. I would like to.

3 is a diagram showing a method of recording management information in file information for reproducing and managing auxiliary data according to the present invention.

As shown in FIG. 3, a specific title to be reproduced is managed by a PlayList file, and main AV data constituting substantial contents of the title is recorded in a main clip (not shown). It is managed by a play item which is a main path.

At this time, one main clip may be managed by a plurality of playitems as necessary, and different main clips may be managed by a plurality of playitems in one playlist. .

In addition, the auxiliary data supporting the main AV data is recorded in a separate clip and managed by sub play items (SubPlayItems) which are sub paths.

That is, the auxiliary data is managed according to a plurality of sub play items by being separated according to a clip type. For example, one or more pieces of auxiliary data are included in a clip managed by sub play item 1 (SubPlayItem 1). An audio clip, which is managed by SubPlayItem 2, includes a plurality of text subtitle clips that support subtitle information such as Korean, English, and Japanese, or text such as song lyrics. This can be In addition, among the auxiliary data, data such as a pop-up menu except for the audio clip and the text subtitle clip, such as an interactive graphic stream, may be managed by SubPlayItem 3.

At this time, the PlayItem (PlayItem) in the PlayList (PlayList) includes the reproduction management information for reproducing the main data, the Sub PlayItem (SubPlayItem) includes the reproduction management information for reproducing the auxiliary data, In particular, as mentioned above, the reproduction of the clips using information on the reproduction start time (In-Time) and the reproduction end time (Out-Time) of each clip as the reproduction management information. Will be managed.

As described above, the file structure according to the present invention has a structure managed by a plurality of subplayitems (SubPlayItem) for each clip type according to a clip type of each clip independently configured.

In particular, a plurality of text subtitle clips may exist independently to express various languages (eg, Korean, English, ...), and the plurality of text subtitle clips may be present. Clips have a structure managed by one SubPlayItem.

The necessary font file information of the text subtitle stream having such a structure is recorded in an information area (Clip Info) of the text subtitle clip, and then, when playing a playlist (PlayList), The file in which the text subtitle clips are stored and the associated font files are preloaded into the buffer and used.

In addition, as in the embodiment of the present invention, when the main AV stream is managed by a plurality of PlayItems, a text subtitle managed by one SubPlayItem is also applied to the plurality of PlayItems. Seamless playback should be performed, and information on the language included in each of the text subtitle clips will also be needed. Details thereof will be described later.

4A through 4B are diagrams illustrating an example in which a main AV stream and an auxiliary data, in particular, a text subtitle are simultaneously provided for the purpose of understanding the present invention, and FIG. 4A is text as subtitle information in the main AV stream. For example, the subtitle is supported in Korean, and FIG. 4B illustrates an example in which the text subtitle is supported in English as subtitle information in the main AV stream.

As shown in FIGS. 4A and 4B, text subtitles such as Korean and English exist as independent clips, and are displayed on one side of the screen separately from the main AV stream according to a user's selection.

In connection with the present invention, a method for including various necessary information of the text subtitle in each Clip Information area (Clip Info area), an optical disc reproducing method, and a reproducing apparatus according thereto will be described.

5 is a diagram illustrating information included in a ClipInfo () area of auxiliary data clip information according to the present invention.

As shown in FIG. 5, the clip info file zzzzz.Clpi having attribute information and timing information for each corresponding stream file (* .m2ts, * .txtst, etc.) has five objects ( ClipInfo (), SequenceInfo (), ProgramInfo (), CPI (), and ClipMark ().

Among these, the "ClipInfo ()" area basically includes a "Clip_stream_type" field and an "application_type" field. The "Clip_stream_type" field is a field for specifying the type of the AV stream, and both the main AV stream and the text subtitle stream recorded in the MPEG 2 transport packet are set to one.

In addition, the "application_type" field is a field for specifying an application type of a clip. If the "application_type" field is 1, a transport stream for movie applications is shown. A transport stream for a time based slide show, a transport stream for a browsable slide show in the main pass if 3, a transport stream for a browsable slide show in the sub pass, If 5, the transport stream for the interactive graphics stream of the subpath is defined, and if 6, the transport stream for the text subtitle stream of the subpath is defined. That is, each stream attribute is defined according to the "application_type".

In this case, when the "application_type" is 6, that is, in the case of a text subtitle stream, a "character_code" field defining character code values, a "number_of_fonts" field defining the total number of fonts, and a plurality of font files Each field contains a "font_file_name [font_id]" field which defines the font file name.

At this time, the character code values used in the "character_code" field are summarized in Table 1 below.

value Character code Encoding 0x00 reserved 0x01 Unicode V1.1 (ISO 10646-1) UTF8 0x02 Unicode V1.1 (ISO 10646-1) UTF16 big endian 0x03 GBK18030-2000 (chinese) N.A 0x04 GB2312 (chinese) N.A 0x05 BIG5 (Chinese) N.A 0x06 Shift JIS (Japanese) N.A 0x07 KSC 5601-1987 including KSC 5653 for Roman character (Korean) N.A others reserved

Character code values can be specified and used according to the values in Table 1 above. Characters in a text subtitle stream are recorded in a big endian form.

In addition, the "font_file_name [font_id]" field included in the ClipInfo () area is mapping information between a font file recorded in an auxiliary data directory (AUX DATA) and font_id which is font information used in a text subtitle. When font information to be used in a specific region or text string in the text subtitle stream is represented by font_id, it indicates that font information stored in the “font_file_name [font_id]” field is applied according to the mapping information.

Meanwhile, the font file designated by the "font_file_name [font_id]" field (for example, the "aaaaa.font" file or the "aaaaa.otf" file of FIG. 1) is preloaded into the buffer before playing the playlist. pre-loaded).

6 is a diagram illustrating information included in a SequenceInfo () region of auxiliary data clip information according to the present invention.

As shown in FIG. 6, "number_of_ATC_sequences" field information indicating the total number of Arrival Time Clock (ATC) -sequences is basically recorded in the SequenceInfo () area among the five objects of the clip info file (zzzzz.Clpi). Information of the "SPN_ATC_start [atc_id]" field, the "number_of_STC_sequences [atc_id]" field, and the "offset_STC_id" field, sequentially increasing from the ATC ID 0 (ATC_id = 0) which distinguishes the ATC-sequence by the total number of the ATC-sequences. Will be recorded.

In this case, in the case of a text subtitle, the "number_of_ATC_sequences" field indicating the total number of ATC sequences should be 1. That is, each text subtitle file always consists of a single ATC-sequence.

In detail, when the text subtitle stream is recorded on a disc, the text subtitle stream is recorded into a BD source packet composed of 192 bytes, and each source packet includes an Arrival Time Stamp (ATS) composed of 4 bits. do. In this case, the ATS is continuously increased for all source packets included in the text subtitle file, and thus should form a single ATC sequence without discontinuity. Therefore, the ATS is always included in ClipInfo () associated with all text subtitle files. It should be "number_of_ATC_sequences = 1".

The "SPN_ATC_start [atc_id]" field is an area for recording a source packet number (SPN: Source Packet Number) of the start position of the ATC sequence specified by atc_id in the AV stream file, and the "offset_STC_id" field is the first STC. A field indicating an offset stc_id value of a sequence, wherein the "number_of_STC_sequence [atc_id]" field is a field indicating the total number of System Time Clock (STC) -sequences in the ATC sequence specified by atc_id. In this case, in the case of a text subtitle stream, the total number of STC-sequences is set to 1 (a detailed description thereof will be described later).

Further, STC_id is sequentially increased from the offset value one by one by the number of the total number of STC-sequences designated by the "number_of_STC_sequence [atc_id]" field plus the offset value designated by the "offset_STC_id [atc_id]" field. Information of the "SPN_STC_start [atc_id] [stc_id]" field, the "presentation_start_time [atc_id] [stc_id]" field, and the "presentation_end_time [atc_id] [stc_id]" field.

The "SPN_STC_start [atc_id] [stc_id]" field is a field indicating a source packet number (SPN) of the start position of the STC-sequence specified by stc_id in the ATC-sequence by atc_id. In this case, in the case of a text subtitle stream, the field is set to zero.

Further, the "presentation_start_time [atc_id] [stc_id]" field and the "presentation_end_time [atc_id] [stc_id]" field indicate the start time and end time of the STC_sequence by stc_id of the ATC-sequence specified by atc_id in the AV stream. Field to represent. In this case, in the case of the text subtitle stream, the start time is set to 0, and the end time is the same as the end time of the last presentation.

Meanwhile, FIG. 7 is a diagram showing the STC-sequence of the text subtitle clip according to the present invention.

As illustrated in FIG. 7, a text subtitle managed by one sub-playitem (SubPlayItem) for an HDMV movie represented by a plurality of playitems (PlayItem) has one STC-sequence, and the STC-sequence is a playlist ( PlayList) is expressed in the same manner as the global time axis.

In order to provide continuous text subtitle information irrespective of the number of PlayItems, this is expressed in the same manner as the Global time axis of the PlayList using one STC-sequence. Because it is natural and desirable.

In more detail, the global time axis, as shown in Fig. 6, when the playitems included in any playlist have different time information (that is, the clips included in the playlist have different STC information). It is a time base for converting it into one continuous time information.

Therefore, text subtitles should be created based on playlists, not on individual playitems, and reduce the burden of decoding, so each data unit (e.g., on a global time axis with consecutive values within a playlist) In addition, the presentation time of the dialog or dialog presentation unit (DSU) is determined and included in the stream.

Accordingly, all text subtitle files are composed of a single STC sequence because a stream is generated based on one continuous time axis information. In other words, "number_of_STC_sequences = 1" should always be present in the ClipInfo () area associated with all text subtitle files.

Also, as mentioned above, the start time of the STC-sequence is set to 0, and the end time is equal to the end time of the last presentation.

At this time, in order to decode the text subtitle having one STC-sequence, the decoder should know information about STC discontinuities (see circular arcs in FIG. 7) of the main AV clips of the playlist (PlayList).

8 is a diagram illustrating information included in a ProgrmaInfo () area of auxiliary data clip information according to the present invention.

As shown in FIG. 8, in the ProgramInfo () area of the five objects of the clip info file (zzzzz.Clpi), a program sequence (Program-sequence), which is a continuous collection of source packets related to the content of a program, is recorded and a text subtitle stream is generated. The number of program sequences is set to one. That is, only the text subtitle stream exists in the text subtitle clip.

The ProgramInfo () area includes a "number_of_program_sequence" field, a "SPN_program_sequence_start [i]" field, a "program_map_PID" field, a "number_of_streams_in_ps [i]" field, a "stream_PID [i]" field, and a "StreamCodingInfo (i, stream_index)" field Etc. The "StreamCodingInfo (i, stream_index)" field has coding information about an elementary stream of a main AV stream and an auxiliary data stream.

Therefore, referring to the configuration of the "StreamCodingInfo (i, stream_index)" field having coding information of an elementary stream, a "length" field indicating the length of the "StreamCodingInfo (i, stream_index)" field and an elementary stream There is a "stream_coding_type" field indicating a coding type of an elementary stream, and includes coding information for various types of streams according to the coding type of the elementary stream.

That is, for example, when the stream_coding_type is 0x02, coding information about an MPEG-2 video stream is displayed, HDMV LPCM audio when 0x80, Dolby AC-3 audio when 0x81, and dts audio when 0x82. 0x90 indicates a presentation graphic stream, 0x91 indicates an interactive graphic stream, and 0x92 indicates a text subtitle stream. In FIG. 8, the stream_coding_type is shown for convenience. The case where 0x02 and 0x92 are shown.)

In this case, when the stream_coding_type is 0x92, that is, in the case of the text subtitle stream, the language information of the text subtitle clips may be included using the "textST_language_code" field.

As described above, it is obvious that the method of inserting necessary language information in the text subtitle clip information is applicable to selecting a plurality of pieces of clip information in the sub playitem.

On the other hand, of the five objects of the clip info file (zzzzz.Clpi), CPI () is an area indicating the relationship between the time information and the address information of the AV stream, and the ClipMark () area is an undefined area. Therefore, since the method of managing the auxiliary data clip of the present invention as a sub-playitem is not highly related, a detailed description thereof will be omitted.

Thus, the main features of the present invention can be identified from the above-described embodiment is as follows.

First, each text subtitle having various language information is composed of independent clips and has a structure managed as sub playitems.

Second, necessary font information, sequence information, etc. of the text subtitle are recorded in a clip info (clip info area) region of the text subtitle clip. Configure as in

Each of the above-listed features has individual features, and only the main features of the various features are listed for the understanding of the present invention, and it is obvious that the present invention is not limited to the above-listed features.

9 is a block diagram showing the configuration of an optical recording and reproducing apparatus in which the technical idea of the present invention is implemented according to the above-described embodiment.

As shown in Fig. 9, the optical recording and reproducing apparatus according to the present invention includes a pickup section 11 for reading main data, auxiliary data, and reproduction management information recorded in the optical disk, and controlling the operation of the pickup section 11; Servo 14 and a signal processor 13 for restoring a reproduction signal received from the pickup unit 11 to a desired signal value or modulating and transmitting a signal to be recorded into a signal recorded on an optical disc. ), A memory 15 for pre-loading and temporarily storing the reproduction management information including the auxiliary data, and a microcomputer 16 for controlling the operation.

In this case, the memory 15 used in the present invention is represented by one memory 15 collectively as various storage means (RAM, buffer, etc.) that can exist in the optical recording and reproducing apparatus, and a plurality of storage means having different names. It is apparent that the memory 15 of the present invention can be replaced by the above.

Also, the AV decoder 17 finally decodes the output data under the control of the controller 12 and provides the same to the user. The AV encoder 18 controls the controller 12 to perform a function of recording a signal on an optical disc. According to the control of), the input signal is converted into a signal of a specific format, for example, an MPEG2 transport stream, and provided to the signal processor 13.

In addition, the control unit 12 is a block for controlling the operation of the entire optical recording and reproducing apparatus. If there is a playback request command for a specific title of the user, the control unit 12 includes a corresponding PlayItem and a PlayItem in the PlayList directory. Read SubPlayItem information, and play the PlayItem and the SubPlayItem according to the font and sequence information regarding the text subtitle of the main data and the auxiliary data included in the read information. Will be performed.

As described above, the method, apparatus and method for configuring a data file of a high density optical disc according to the present invention independently configure text subtitle clips managed as sub playitems, and font information and sequence information about the text subtitle. By including in the clip info area of the text subtitle clip, there is an effect of more efficiently recording and reproducing the high density optical disc.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

1 is a diagram showing a file structure for managing data recorded on a disc according to the present invention.

2 is a diagram briefly illustrating a form in which information related to a file structure according to the present invention is recorded in a disc.

3 is a diagram showing a method of recording management information in file information for reproducing and managing auxiliary data according to the present invention;

4A to 4B illustrate an example in which a main AV stream and a text subtitle are simultaneously provided according to the present invention.

5 is a diagram illustrating information included in a ClipInfo () area of auxiliary data clip information according to the present invention.

6 is a diagram illustrating information included in a SequenceInfo () region of auxiliary data clip information according to the present invention.

7 illustrates an STC-sequence of a text subtitle clip in accordance with the present invention.

8 is a diagram illustrating information included in a ProgrmaInfo () region of auxiliary data clip information according to the present invention.

9 is a block diagram showing a configuration of an optical recording and reproducing apparatus according to the present invention.

-Explanation of symbols for the main parts of the drawing-

11 pickup 12 control unit

13 signal processing unit 14 servo

15: memory 16: microcomputer

17: AV decoder 18: AV encoder

Claims (18)

Manage text subtitle clips consisting of independent clips for each language as one sub play item in the playlist, And font information and sequence information of the text subtitle stream are included in a clip info area of the text subtitle clip. The method of claim 1, And the font information of the text subtitle stream is recorded in a "ClipInfo ()" area of the clip info area. The method of claim 2, The character code value of the font information is recorded in the "character_code" field. The method of claim 3, wherein And said character in said text subtitle stream is recorded in a big-endian form. The method of claim 2, And a total number of fonts in the font information is recorded in a "number_of_fonts" field. The method of claim 2, And mapping information between a font file and font information used in the text subtitle among the font information is recorded in a field "fotn_file_name [font_id]". The method of claim 1, ATC-sequence and STC-sequence information of the sequence information are recorded in the "SequenceInfo ()" area of the clip info area. The method of claim 7, wherein And a total number of ATC sequences in the ATC-sequence information is one for a text subtitle stream. The method of claim 7, wherein And a total number of STC sequences in the STC-sequence information is one in case of a text subtitle stream. The method of claim 9, And said one STC-sequence is represented in the same way as the global time axis of said playlist. The method of claim 7, wherein And a presentation start time of a text subtitle stream of the ATC-sequence and STC-sequence information is zero. The method of claim 7, wherein The presentation end time of the text subtitle stream of the ATC-sequence and STC-sequence information is the same as the end time of the last presentation. The method of claim 1, The program sequence information of the sequence information is recorded in the "ProgramInfo ()" area of the clip info area, the data file composition method of the high density optical disc. The method of claim 13, And the total number of the program sequences is one in case of a text subtitle stream. The method of claim 13, And the language information of the text subtitle is recorded in the "ProgramInfo ()" area. An optical disc in which a file is recorded by the file organization method according to claim 1. Reading information of the corresponding playitem and sub playitem in the playlist file according to a play request command for the specific title of the user; And reproducing the playitem and the subplayitem according to the font and sequence information of the text subtitle of the main data and the supplementary data included in the read information. . A memory for reading out and storing information of a corresponding playitem and a subplayitem in a playlist file according to a playback request command for a specific title of the user; And a control unit for reproducing the playitem and the subplayitem according to the font and sequence information of the text subtitle of the main data and the supplementary data included in the read information. Way.