KR20050092836A - Apparatus and method for reproducing a text subtitle stream of high density optical disc - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a playback apparatus for reproducing a text subtitle on a high density optical disc such as a Blu-ray Disc (BD). In reproducing a text subtitle stream, the present invention relates to a text subtitle stream. As recorded information, information (Player_style_flag) indicating whether or not to allow the change of the style information (Style Info) is read, and when it is recognized that the change of the style information is allowed from the information, it is determined whether or not to change the style information and the text It is characterized in that the subtitle is reproduced, through which the style information can be provided in various ways as the reproduction management information for the reproduction of the text subtitle, thereby enabling efficient text subtitle reproduction on a high density optical disc. will be.

Description

Apparatus and method for reproducing a Text Subtitle stream of high density optical disc}

The present invention relates to a reproducing method and a reproducing apparatus for efficiently reproducing a text subtitle recorded in an optical disc, and in particular, a text subtitle as auxiliary data in a high density optical disc such as a Blu-ray Disc. The present invention relates to a method and apparatus for providing reproduction management information for reproducing a text file and reproducing a text subtitle using 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-definition 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 contain data that significantly surpasses the existing DVD. Recently, the world's standard technical specifications with other digital devices have been established.

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, various data for user convenience such as text subtitle information should be provided as auxiliary data related to the main AV data as well as the main AV data. In addition, management information for reproducing the main data and the auxiliary data recorded in the optical disc should be systematically provided.

However, the current Blu-ray Disc (BD) standard does not have a unified standard for the auxiliary data, especially the text subtitle information. Therefore, there are many limitations in developing an optical Blu-ray Disc (BD) -based optical recorder. This is particularly true in the case of recording and reproducing text subtitles on an optical disc.

The present invention was created in view of the above circumstances, and an object of the present invention is to provide a reproducing method and apparatus for reproducing text subtitles on a high density optical disc such as a Blu-ray Disc (BD). .

It is intended to provide a systemized reproduction management information for reproducing text subtitles in an optical disc as standardized information.

Another object of the present invention is to provide an efficient text subtitle playback method and apparatus using the configured text subtitle playback management information.

In the method for reproducing a text subtitle of a high density optical disc according to the present invention for achieving the above object, when reproducing a text subtitle stream, the information recorded in the text subtitle stream is changed to change style information (Style Info). Read information (Player_style_flag) indicating whether or not allowed, and if it is recognized that the change of the style information is allowed from the information, it is characterized by reproducing the text subtitle by determining whether or not to change the style information,

In addition, the apparatus for reproducing a high density optical disc text subtitle according to the present invention includes a preloading buffer which preloads and stores the text subtitle stream when reproducing the text subtitle stream in which unique style information is recorded. Reads the information (Player_style_flag) indicating whether to change the style information recorded in the text subtitle stream (Style Info), and if the change is allowed, applies the separately provided style information to apply the preloaded text sub And a decoder for playing the title.

In the high-density optical disc of the present invention, a main AV stream and a text subtitle stream related to the main AV stream are recorded in separate files, and style information is recorded in the text subtitle stream. Identification information (Player_style_flag) indicating whether or not to change the style information is recorded separately.

Hereinafter, exemplary embodiments of a method of reproducing a text subtitle 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 terms used in the present invention was selected as a general term widely used as possible now, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, The present invention is to be understood as the meaning of terms rather than names.

In this regard, the meaning of "main data" used in the present invention refers to 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 known as the "main AV stream."

In addition, the meaning of "auxiliary data" means all data related to main data provided for the user's convenience in playing back the "main data", including subtitle information, interactive graphic streams, presentation graphic streams, Sound information, audio data for additional browsable slideshows, etc., and depending on the nature of each auxiliary data, are recorded multiplexed into the main AV stream in MPEG2 format, or in MPEG2 format or other formats. It may also be recorded in a stream file independent of the AV stream.

In addition, in the present invention, the term "subtitle" as auxiliary data is a kind of subtitle information. When a user wants to watch a video (main AV data) currently being played with subtitles of a specific language, the subtitle supported by the optical disc If the subtitle of the language is selected, it means the information displayed on one side of the screen. Accordingly, the subtitles can be provided in various forms. In particular, the subtitles recorded as text data are referred to as "text subtitles".

Regarding the present invention, when the "Text Subtitle" is configured in MPEG2 format and is recorded in a stream file independent from the main data, the "Text Subtitle" data and the The present invention provides a method and apparatus for recording and managing management information in optical disc file information and reproducing "Text Subtitle" by using the same.

Hereinafter, a recording format for recording auxiliary data including the main data and text subtitle data in 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 shows a file structure for managing data recorded on a disc, where at least one BD directory exists under one root directory, and a user exists in the BD directory. It contains the index file (index.bdmv) and the object file (MovieObject.bdmv) as general file (parent file) information to ensure interactivity with the file, and plays back data recorded on the actual disk. As four directories having information on information, a method of playing them, and the like, a playlist directory (PLAYLIST), a clip information directory (CLIPINF), a stream directory (STREAM), and an auxiliary data directory (AUXDATA) are provided. Hereinafter, the above four types of directories and files included therein will be described first, and then the relation between text subtitle information and files related to the present invention will be described in detail.

First, in the stream directory (STREAM), auxiliary streams such as files and text subtitles for the main video and audio streams (called "main AV streams") recorded in a specific format on the disc (called "text subtitle streams"). Is independently present, and as described above, the stream file is recorded as a transport packet of the MPEG2 method, which is now widely known, and thus, the stream file (01000.m2ts, 02000). .m2ts, 10001.m2ts) extension will be used as "* .m2ts", but the "text subtitle stream (10001.m2ts)" has a different nature of auxiliary data than the main AV stream. For example, you can use file extensions separated by "* .txtst".

In the BD specification, such a stream file is sometimes called a "clip stream file." In connection with the present invention, the above-described text subtitle data is in the form of a separate file from the AV stream. That is, it will exist as a text subtitle stream file (10001.m2ts or .txtst).

The clip information directory (CLIPINF) is composed of each stream (* .m2ts) file and one-to-one corresponding clip info file (* .clpi). In particular, the clip information file (* .clpi) records attribute information and timing information of a corresponding stream file. Among the information, the presentation time stamp (PTS) is determined by an entry point map method. : One-to-one correspondence between a Presentation Time Stamp (SPN) and a Source Packet Number (SPN) in a table form, and then time information (In) provided by a PlayItem or a SubPlayItem that will be described later. Mapping information for searching a specific position of a corresponding stream file (* .m2ts) from -Time and Out-Time may be provided depending on the type of clip.

As described above, a stream (* .m2ts) file and a clip information file (* .clpi) corresponding to each other are bundled together, and the BD standard calls it "clip." Therefore, the file "10001.clpi" in the clip information directory (CLIPINF) contains attribute information for the file in the stream directory (STREAM), for example, the text subtitle stream file "10001.m2ts", and the file "10001. clpi "and" 10001.m2ts "form one clip.

The playlist directory (PLAYLIST) consists of playlist files (* .mpls), and each playlist file (* .mpls) contains at least one play that specifies the playing interval for a particular clip. Contains an item (PlayItem). Therefore, PlayItem (PlayItem) is the playback start time (In-Time) and end of playback of a particular clip (Clip) specified by the clip name (Clip_Information_File_ name) in the PlayItem (PlayItem) It has time information on Out-Time, which has been used in mapping information in ClipInfo (* .clpi), as described above.

As a result, the playlist file (* .mpls) becomes basic playback file information for playing a desired clip combination by combining at least one PlayItem. Also, a playlist file (* .mpls) is provided with 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 will be synchronized with the PlayItem, and if the SubPlayItem is provided to play a browsable slide show, the asynchronous to the PlayItem is non- -synchronized) to reproduce the data.

In relation to the present invention, a case of managing auxiliary data including a text subtitle as the subplayitem (SubPlayItem) will be described by way of example. A detailed description thereof will be described later.

The auxiliary data directory (AUXDATA) is an area for separately recording auxiliary data files for disc playback. For example, an auxiliary data directory (AUXDATA) provides a "sound file" for providing a click sound to support user-friendly disc playback. Sound.bdmv) " and " font files (* .font or * .otf) " applied to the reproduction of text subtitles.

Therefore, in a specific use example, it may be possible to record the text subtitle stream 10001.m2ts, which is a kind of auxiliary data, in the auxiliary data directory AUXDATA.

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

Fig. 2 briefly shows a form in which information related to the file structure is recorded on a disc. From the inside of the disc, a file system information area and a recorded stream as system information for managing the entire file are shown. Playlist files and clip information files for playing (* .m2ts) files, and areas where index files (index.bdmv) and object files (MovieObject.bdmv) are recorded as parent files (regular files) (referred to as "Database Area"). It can be seen that there is a stream file area in which main data and auxiliary data, such as "," and audio / video / graphic, are recorded.

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

Hereinafter, a method of newly defining management information for reproducing the text subtitle of the present invention, recording it as disk file information, and a method and apparatus for reproducing the text subtitle using the recorded management information will be described in detail.

3 illustrates an example in which the text subtitle data and the main data are simultaneously displayed in one screen of the present invention, and show that the text subtitle data is provided in synchronization with the main data in time.

4 is a diagram schematically showing a method of reproducing and managing a text subtitle of the present invention in connection with file information on a file structure. The text subtitle of the present invention is managed by a SubPlayItem in a playlist. A plurality of text subtitle clips (Clips) are reproduced and managed together in one subplayitem (SubPlayItem).

Specifically, at least one PlayItem (PlayItem) for managing the playback of the main AV clip (Clip) in the PlayList (PlayList) file, and if there is a text subtitle related to the main AV data Managed as a SubPlayItem, for example, there is a text subtitle clip 1 in English and a text subtitle clip 2 in Korean, respectively. The title clips 1 and 2 are synchronized with the main AV data in time, and will be displayed on the screen together with the main AV data at a desired presentation time.

Therefore, in order to reproduce the text subtitle, it can be seen that information about the presentation time to be played and the position and size to be played in the screen is required as the minimum management information. A method of recording various management information for reproducing the subtitle as file information in the optical disc will be described in detail.

5A to 5C are diagrams for explaining management information for reproducing and managing text subtitles of the present invention. FIG. 5A is dialog information, FIG. 5B is region information, and FIG. 5C is style. It is shown for explaining the information (Style Info).

FIG. 5A is information for reproducing and managing a text subtitle of the present invention, and relates to dialog information, wherein "Dialog" means at least one or more text data existing within a specific presentation time. Refers to management information that integrates and manages (Text data).

That is, the presentation time that informs the playing time of the screen is generally expressed as a "PTS (Presentation Time Stamp)", and defines the entire text subtitle displayed during a specific PTS section as a dialog. Therefore, the playback management can be convenient.

For example, if the text subtitle data displayed during the PTS (k) and PTS (k + 1) time is composed of two lines, all the text subtitle data are defined by the same dialog. I can see that. In this regard, a maximum of 100 conditions for the number of character codes of the text subtitle data included in the dialog may be desirable.

FIG. 5B is information for reproducing and managing a text subtitle of the present invention, and relates to region information, and a "region" constitutes a dialog existing within a specific presentation time. As information to be described, it refers to an area to which style information (Style Info, in particular, “global style information”) to be described later is equally applied, and up to two regions may exist in one dialog. That is, a dialog may be composed of one region and two regions.

In relation to this, in the present invention, the reason for defining only a maximum of two regions in one dialog is that the decoding burden is taken into account when reproducing a text subtitle. It is obvious that at most n (n> = 2) regions can be defined in the Dialog.

Fig. 5C is information for reproducing and managing text subtitles of the present invention, which relates to style information, and " Style Info " is information specifying how to display text subtitle data on the screen. The position, size, and background color of the screen correspond to essential style information. In addition, the alignment method, text flow, etc. Accordingly, various types of information can be defined as style information and used as a standard.

In this regard, the present invention intends to utilize style information by dividing the style information into "Global Style Info" and "Local Style Info". This is to make various displays.

That is, "Global Style Info" is Style Info applied to each region in the same manner, and information specifying the location and size of each region of the text subtitle in the screen. This is also referred to as "region style information" (region_styles). FIG. 5C illustrates an example in which two regions (region # 1, # 2) have different “region style information (region_styles)”. For example, region 1 (region # 1) represents region style information (region_styles). This is a case where "position1, size1, color = blue" is shown, and region 2 (region # 2) shows a case where "position2, size2, color = red" is used as region style information (region_styles).

Further, "Local Style Info" is Style Info applied to each text data line or text data character in a region, and is referred to as "Inline Style Information ( inline _styles) ". For example, in FIG. 5C, when "inline_styles" is applied to region # 1, the "mountain" portion of the text data is applied with inline style information (inline_styles) different from other text data. The case is shown.

In this regard, the data to which specific inline style information (inline_styles) of text data is applied as described above is referred to as a "text string".

6A and 6B illustrate a method of providing a text subtitle by using the dialog information, region information, style information, etc. as the text subtitle reproduction management information. .

FIG. 6A relates to a method of defining each dialog applied to each presentation time (PTS) section. There are four dialogs between PTS1 and PTS6, and dialog # 1 is shown in FIG. Displayed as "Text # 1" as text data in the PTS1 to PTS2 section, Dialog # 2 has two regions (region1 and region2) in the PTS2 to PTS3 section, and "Text in region1". # 1 "is displayed as" Text # 2 "as text data in region2, and Dialog # 3 is displayed as" Text # 2 "as text data in the PTS3 to PTS4 section. , Dialog # 4 shows a case where "Text # 3" is displayed as text data in the PTS5 to PTS6 section. The PTS4 to PTS5 section means a section without text subtitle data.

The method of defining each dialog information constituted as described above will be described in detail. First, in each dialog, it is essentially necessary to include a time information (PTS set) in which the dialog is displayed. Information on the style information, style information, and actual text data is necessary.

In this regard, the displayed time information (PTS set) is divided into " PTS start " and " PTS end " information, and the style information is described in the above-described " Global Style Info " Defined as "Local Style Info", in the present invention will be recorded as "region style information (region_styles)" and "inline_styles", respectively, "Text Data" The text data actually displayed will be recorded.

In particular, in the case of Dialog # 2, two regions (regions 1 and 2) are included, so style information and text data for each region (regions 1 and 2) are provided. ) Will be recorded.

FIG. 6B is a diagram for explaining a method of continuous playback between adjacent dialogs. For example, region 1 of dialog # 1 and dialog # 2 is continuously played. (continuous), and region 2 of dialog # 2 and dialog # 3 are continuously displayed.

That is, for continuous playback between adjacent dialogs, the following conditions must be satisfied. First, the PTS must be continuous without interruption (for example, in FIG. 6B, "presentation end time of dialog # 1 = dial in FIG. 6B). Continuity of reproduction is given by matching presentation start time = PTS2 "of log # 2), and next, the style info of consecutive dialogs should be the same. Therefore, in the case of Dialog # 3 and Dialog # 4, since the PTS is not continuous, it is a discontinuous section rather than continuous playback.

In connection with this, information ("continuous_presentation_flag") indicating whether or not continuous playback with the previous dialog is provided in the current dialog information can be further facilitated.

FIG. 7 is a diagram for explaining the information recorded in the text subtitle stream of the present invention in detail. For example, the recording sub form of the text subtitle file " 10001.m2ts "

That is, the text subtitle stream of the present invention is composed of an MPEG-2 transport stream, and all of the transport packets (TP) included in the stream are the same as PID (Packet Identifier). Is assigned as "PID = 0x18xx". Therefore, the optical recording / reproducing apparatus reads out the transport packet TP to which " PID = 0x18xx " is assigned to the input stream, thereby making it possible to easily read only the text subtitle stream.

In addition, the plurality of transport packets TP constitutes one "PES (Packet Elementary Stream) paxket". In the present invention, a plurality of "PES packets" are formed for each of the dialogs described above. This has the advantage of easy playing of the dialog.

In addition, the first "PES packet" in the text subtitle stream is a set unit of region styles of the above-described style information, and the "Dialog Style Unit (DSU)" is located. The "PES packet" has a structure of recording "Dialog Presentation Unit (DPU)" as a unit in which actual dialog information is recorded.

Therefore, in the case of following the text subtitle stream structure as shown in Fig. 7, each dialog information defined in Figs. 6A and 6B described above means dialog presentation information (DPU), and is represented in the dialog information. Style Info includes information that links any one of a variety of region styles set defined in the dialog style information DSU and region_style identifier and inline style information. styles).

In relation to the present invention, the dialogue style information (DSU) records the maximum number of region styles (set) set by standard, for example, up to 60 unique style information is recorded. Each of these is identified by a region style ID (region_style_id).

Accordingly, the disc author (Author) records the dialog style information (DSU) as a set of style information to be applied to the text subtitle when the disc is produced, the dialog style information (DSU) recorded in the disc is as described above. Since only a limited number (for example, up to 60) can be recorded, it is possible to play back text subtitles having more diverse styles by utilizing the style information that can be provided outside the disc in addition to the style information recorded in the disc. It may be.

Hereinafter, a method and apparatus for reproducing a text subtitle stream using various style information will be described in detail with reference to FIGS. 8 to 11.

First, Fig. 8 shows the syntax of the text subtitle stream (“Text_subtitle _stream ()”) of the present invention. As described above with reference to Fig. 7, “Text _subtitle_stream ()” of the present invention is style information. (Style Info) A plurality of dialog presentation information ("dialog_style_unit ()" syntax relating to one dialog style information (DSU) defining a set and actual dialog information is recorded) The load is composed of "dialog_presentation_unit ()" syntax regarding the DPU).

9A to 9C illustrate specific configurations of the "dialog_style_unit ()" syntax.

FIG. 9A relates to the overall configuration of the "dialog_style_unit ()" syntax of the present invention. In "dialog_style_unit ()", a set of various style information (Sytle Info) utilized in a dialog is shown. You can see that defining "dialog_styleset ()" is defined.

FIG. 9B relates to the "dialog_style set ()" of the present invention, which is defined in the "dialog_style_unit ()". In addition to the region-styles described above, the style information is changed in the "dialog_style set ()". There are "Player_style_flag" indicating whether to allow and "user_changeable_styleset ()" which defines the range of style information change by the user. The details are as follows.

First, as described above, the region-styles mean "global style information" defined for each region, and the identification information (region-style) is defined for each region style. "region_style_id") is assigned, and a style information set corresponding to a specific "region_style_id" is defined.

Therefore, in the dialog, the "region_style_id" applied to the dialog is recorded, and when the dialog is to be played, the same "region_style_id" in the "dialog_style set ()" is recorded. Plays by applying the style information set defined by.

In relation to this, individual style information (Style Info) included in a style information set provided for each "region_style_id" will be described below.

First, "region_horizontal_position", "region_vertical_position", "region_width", and "region_height" are provided as information defining the position and size of the screen of the region, and the background color of the region is provided. Information about "region_bg_color_index" is provided.

Next, as information defining the origin position of text in the region, "text_horizontal_position" and "text_vertical_position" are provided, and the writing direction of the text (left-> right, right-> left, up->) is provided. Defines "text_flow" and "text_alignment" which defines the alignment direction of the text (left, center, and right). In particular, in the case of "text_flow", a plurality of regions are defined in a specific dialog. ) Exists, each region in the dialog is defined to have the same "text_flow" value, in order to prevent user's viewing confusion.

In addition, as individual style information included in a style information set, "line_space" for specifying an interval between lines in a region, and font information for actual text data. "Font_type", "font_style", "font_size" and "font_color_index" information are provided.

On the other hand, "Player_style_flag" recorded in "dialog_style set ()" is information indicating whether or not the disk author (Author) can use the style information held by the player, for example, "Player_style_flag = 1b". In this case, in addition to the style information defined in the "dialog_style set ()" in the disk, the player allows the player to play the text subtitle using the style information provided in the device, and "Player_style_flag = 0b". This means that only style information defined in "dialog_style set ()" on disk can be used. The reproducing method and the reproducing apparatus will be described later in detail with reference to FIGS. 10 and 11.

Figure 9C relates to the "user_changeable_style set ()" syntax of the present invention, which is defined in the "dialog_style_unit ()" syntax.

In this regard, the "user_changeable_style set ()" of the present invention pre-defines the type and range of changeable style information by the user, so that the user can easily change the style of the text subtitle data. To be utilized.

However, if all the style information described above in FIG. 9B is changeable by the user, this may increase the user's confusion. Therefore, in the present invention, only "font_size" and "region_horizontal / vertical_position" are defined as changeable style information. It is characterized in that, but also may be defined at the same time the increase and decrease of "text position" and "line space" that is changed by the increase and decrease of "font_size".

That is, "user_changeable_style set ()" is defined for each of the "region_style_id" mentioned above. For example, up to 25 kinds of user change style information ("user_style_id") can be stored in "user_changeable_style set () within a specific" region_style_id = k ". It is possible to define within "".

In addition, "region_horizontal _position_direction" and "region_vertical_position_direction" information for specifying change movement direction of changeable "region_horizontal / vertical_position" are provided for each "user_style_id", and one change in each direction is specified in pixels. "region_horizontal _position_delta" and "region_vertical_position_delta" information are provided.

That is, for example, "region_horizontal_position_direction = 0" means to move to the right, and "region_horizontal_position_direction = 1" to change to the left. If "region_vertical_position_direction = 0", (change) to (down). If "region_vertical_position_direction = 1", it means to change to up.

Each "user_style_id" is provided with "font_size_inc_dec" information for specifying the change direction of "font_size" which can be changed, and "font_size_delta" information for specifying one change of "font_size" in pixel units. .

That is, for example, if "font_size_inc_dec = 0", it means the direction in which "font_size" increases, and if "font_size_inc_dec = 1", it defines as the direction in which "font_size" decreases. It can be utilized.

In this regard, the characteristics of the "user_changeable_style set ()" of the present invention are as follows.

First, the number of "user_control_style ()" defined in all "region_style ()" included in the dialog style information (DSU) is the same. That is, the number of "user_control_style" applicable to all dialog presentation information (DPU) is the same.

Second, each " user_control_style () " is represented by a different " user_style_id ", and the same order of " user_control_style () " is applied to all " region_style () "

Third, in one "user_control_style ()" all combinations of modifiable styles are defined together. That is, "region_position" and "font_size" are not defined separately, but together.

Fourth, the movement direction (* _direction) or the increment (* _inc_dec) is recorded separately for each change (* _delta). That is, by defining only the change (* _delta) without having the actual style value, in order to obtain a style value that is actually changed, the change is made to the value defined in "region_style ()". The final value should be obtained by adding together (* _delta).

Hereinafter, a method of using style information for reproducing the above-described text subtitle of the present invention will be described.

That is, the disc author (Author) is provided with a plurality of style information ("region_style") related to the production of the text subtitle by dividing the "region_style_id", each "region_style_id" is "font_size" and "region" that can be changed by the user A plurality of "user_style_id" defining _horizontal / vertical_position "is provided. In addition, the disc author (Author) is more diverse by having a "Player_style_flag" as information that allows the player to apply the player-specific style information in addition to the style information ("region_style") recorded in the disc. It can be seen that it is possible to provide style information.

Hereinafter, a method and apparatus for reproducing a text subtitle of the present invention will be described with reference to FIGS. 10 and 11, and will be described in detail with particular reference to the use of the aforementioned style information.

Fig. 10 shows an optical disc reproducing apparatus of the present invention centered on a decoder, and in particular, a decoding means 40 for reproducing a text subtitle is provided separately.

That is, a PID filter for separating the video, audio, graphic, and text subtitle streams from the input stream by the PID (Packet Identifier) basis to reproduce the streams corresponding to the video, audio, graphic, and text subtitles recorded in the optical disc. PID filter 5, video decoding means 20, audio decoding means 10, graphics decoding means 30, and text subtitle decoding means 40 for reproducing each of the separated streams, respectively. Done.

In addition, the text subtitle of the present invention may not only be recorded in the form of a stream in the optical disc, but also may be an input of an external source external to the optical disc. It is provided with a selection means (6) for selecting the input source () of ().

Therefore, if the text subtitle is recorded in the MPEG format as the main data, the signal A input through the PID filter unit 5 will be reproduced. If the text subtitle is an external input source, the separate input signal B will be reproduced. Will play.

In addition, a transport buffer 11, 21, 31 for controlling decoding performance is provided in the video decoding means 20, the audio decoding means 10, and the graphic decoding means 30, respectively. 20 and the graphics decoding means 30 are provided with a video plane 23 and a graphics plane 33 for adjusting the displayed screen, respectively, and the graphics decoding means 30 are provided with a video plane. When combining with (Video Plane, 23), control values for adjusting color and transparency are provided in the form of a table (Color Look Up Table; CLUT, 34).

In addition, after the text subtitle decoding means 40 of the present invention receives the text subtitle data to be reproduced from the selecting means 6, it is preferable to preload and utilize all of them in the preloading buffer 41. Where possible, since the data of one text subtitle generally occupies about 0.5 Mbytes of capacity including associated playback management information, the preloading buffer 41 should be at least larger than the capacity. In addition, if you want to support seamless playback between text subtitles, a larger capacity preloading buffer (41) will be needed, which is optimal considering the data size of the text subtitles. It would be desirable to standardize on size.

The reason for preloading all the text subtitles to the buffer 41 as described above is that, in the case of the text subtitles, the entire text subtitles can be recorded with a small capacity as in the above example, and are recorded in a separate file. By doing so, it is possible to easily read and utilize only the text subtitle data, and the buffer control is easier as the full text subtitle data is preloaded into the buffer.

The preloaded text subtitle data is then changed to desired text subtitle data through a text subtitle decoder 42 (TXT-ST Decoder), and then adjusted to a desired display screen by a graphics plane 43. The "CLUT" control table adjusts the color and the transparency when combining with the above-described video plane (Video Plane) 23.

In relation to this, when reproducing the text subtitle by using the style information in the text subtitle decoder 42, only the style information recorded in the disc is utilized in reading out the "Player_style_flag" value and applying the style information therefrom. In other words, it is determined whether to apply the style information in the style set 45, for example, a means having separate style information in the playback apparatus.

That is, as shown in FIG. 11, if "Player_style_flag = 0b", only the style information recorded in the disc is utilized (S111). If "Player_style_flag = 1b", the style information held in the playback apparatus (for example, the style set 45). (S112), and according to the determination, one of the style information recorded in the disc or the style information held by the playback apparatus is applied to reproduce the text subtitle.

In relation to this, in the determination of step "S112", it is preferable to determine the direction of providing the optimal style information by comparing the presence and the variety of style information held by the playback apparatus with the variety of style information recorded in the disc. something to do.

In addition, it will be apparent that the style information allowed for the change application may be inline styles in addition to the region styles described above.

On the other hand, if the user wants to change the style of the text subtitle, after receiving the user input (User input) by the text subtitle decoder 42, the font (within the specified range in the "user_changeable_styleset ()" mentioned above) It is possible to change the font size and region location.

In this regard, the style change function by the user uses the style information recorded in the optical disc as the case of "Player_style_flag = 0b" because the "user_changeable_styleset ()" syntax for performing this is a kind of style information recorded in the optical disc. Of course, this may be applicable to the case where " Player_style_flag = 1b " may be applicable to the style information provided according to the same standard even when the player style information outside the optical disc is utilized.

In addition, the text subtitle decoded through the above process will be configured together with the output signals of the video decoding means 20 and the graphic decoding means 30 in one screen as shown in FIG. As a means for synthesizing, a synthesizing unit 50 is required, and basically, the signal of the video plane 23 becomes the background of the screen, and the graphic decoding means 30 and the text subtitle decoding means 40. For example, if the output signal of the superposition order is determined according to the mutual characteristics, for example, if the output of the graphic decoding means 30 is a presentation graphic, the presentation graphic is a video plan. 52, the text subtitle information of the text subtitle decoding means 40 will be re-overlaid 53, but the output of the graphics decoding means 30 is interleaved. If it is an interactive graphic, firstly, the text subtitle information of the text subtitle decoding means 40 is superimposed on the video plane 23, and then the interactive graphic is re-overlapping. The composition unit 50 is constituted in the manner of (53).

In addition, it will be apparent that there is a system decoder 4 for performing system decoding on the AV stream, and the microcomputer 3 will be provided as a control means for controlling all the above-mentioned components.

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

Through the method and apparatus for reproducing the text subtitle of the high density optical disc according to the present invention, it is possible to variously provide the style information as the reproduction management information for the reproduction of the text subtitle, so that the effective text subtitle reproduction on the high density optical disc is possible. There is an advantage to being possible.

1 shows a file structure of a high density optical disc of the present invention,

2 shows a recording form of a high density optical disc of the present invention;

3 illustrates an in-screen display form of a text subtitle stream of the present invention.

4 shows a file structure for managing playback of a text subtitle stream of the present invention;

5A to 5C illustrate the use of the reproduction management information for reproducing the text subtitle of the present invention.

6A and 6B show an example of a method of describing reproduction management information in a text subtitle of the present invention;

7 illustrates a text subtitle stream structure of the present invention and playback management information included therein;

 8-9C illustrate the text subtitle stream syntax of the present invention,

10 shows a decoding apparatus in the entire optical recording and reproducing apparatus including the text subtitle stream reproduction of the present invention,

11 is a flowchart illustrating a method of reproducing a text subtitle stream of the present invention.

※ Explanation of code for main part of drawing

5: PID filter 40: text subtitle decoding means

42: Text Subtitle Decoder (TXT-ST Decoder)

41: preloading buffer

45: style set

Claims (16)

A main AV stream and a text subtitle stream related to the main AV stream are recorded in separate files, and style information is recorded in the text subtitle stream, and indicates whether to allow the style information to be changed. A high density optical disc, characterized in that identification information (Player_style_flag) is recorded separately. The method of claim 1, A high density optical disc characterized in that information (user_changeable_styleset) on the range of style information changeable by a user is further recorded. In playing the text subtitle stream, As information recorded in the text subtitle stream, information (Player_style_flag) indicating whether to change style information (Style Info) is read, And if it is recognized that the change of the style information is allowed from the information, it is determined whether or not to apply the change of the style information to reproduce the text subtitle. The method of claim 3, wherein And the style information to be changed is style information existing in addition to the optical disc. The method of claim 3, wherein The style information (Style Info) is a text subtitle playback method of a high density optical disc, characterized in that consisting of region styles (region styles) and inline styles (inline styles). The method of claim 5, And changing both the region styles and inline styles. The method of claim 5, And only the region styles are allowed to be changed. The method of claim 3, wherein A method of reproducing a text subtitle of a high density optical disc, wherein the style information recorded in the optical disc is continuously utilized even if the style information is allowed to be changed. The method of claim 3, wherein And recognizing that the change of the style information is not permitted from the information, utilizing only the style information recorded in the text subtitle stream. The method of claim 3, wherein The style information recorded in the text subtitle stream further includes information (user_changeable_styleset) regarding a range of change of style information by the user. The method of claim 10, And information (user_changeable_styleset) on the change range of the style information by the user is information on a change in position and font size for each region. The method of claim 11, The information on the position change for each region includes information for specifying a horizontal change direction for each region (region_horizontal_position_direction) and information for specifying a vertical change direction (region_vertical_position_direction). How to play subtitles. The method of claim 11, And the information on the font size change includes information (font_size_inc_dec) for identifying whether the font size is increased or decreased. In playing the text subtitle stream in which the unique style information (Style Info) is recorded, A preloading buffer for preloading and storing the text subtitle stream; The preloaded text subtitle is read by reading information (Player_style_flag) indicating whether to change the style information recorded in the text subtitle stream. And a decoder for reproducing a text subtitle of a high density optical disc. The method of claim 14, And a means for providing the decoder with applicable style information when the style information is allowed to be changed, the text subtitle reproducing apparatus of the high density optical disc. In recording a text subtitle stream in a high density optical disc, Record unique style information for reproducing the text subtitle stream, record user style information (user_changeable_styleset) designating a range changeable by the user for the style information, and styles outside the optical disc instead of the unique style information A method of recording a text subtitle of a high density optical disc, characterized by recording identification information (Player_style_flag) allowing application of the information.