CN1934645A - Recording medium and method and apparatus for reproducing and recording text subtitle streams - Google Patents
Recording medium and method and apparatus for reproducing and recording text subtitle streams Download PDFInfo
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- CN1934645A CN1934645A CN 200580008726 CN200580008726A CN1934645A CN 1934645 A CN1934645 A CN 1934645A CN 200580008726 CN200580008726 CN 200580008726 CN 200580008726 A CN200580008726 A CN 200580008726A CN 1934645 A CN1934645 A CN 1934645A
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Abstract
A recording medium, method, and apparatus for reproducing text subtitle streams are disclosed. A microcomputer initially reads a set of PlayItems and a SubPlayItem included in a PlayList which is recorded on a recording medium, and it further reads synchronization information included in the SubPlayItem. Each PlayItem is configured to reproduce at least one main AV stream, and the SubPlayItem is configured to reproduce a text subtitle stream. The synchronization information indicates a presentation start time of the SubPlayItem on a global time axis of the PlayList. When the PlayList is randomly accessed at a random access time on the global time axis, the microcomputer calculates a corresponding access time on a time axis of the SubPlayItem. Then a text subtitle decoder decodes for presentation a dialog presentation segment with the closest dialog start time after the corresponding access time on the axis of the SubPlayItem.
Description
Technical field
The present invention relates to a kind of recording medium, relate in particular to a kind of recording medium, method and apparatus that is used to reproduce text subtitle stream.Although the present invention is applicable to the application of broad range, it is specially adapted to text subtitle stream files is recorded in the recording medium and the text subtitle stream of reproducing recorded effectively.
Background technology
CD is widely used as the optical record medium that is used to write down mass data.At present, in the CD of broad range, the new high-density optical record medium (hereinafter referred to as " HD-DVD ") such as Blu-ray disc (hereinafter referred to as " BD ") is just under development, is used to write and store the video and the voice data of high definition.Current, as everyone knows the global standard technical specification as the Blu-ray disc (BD) of next-generation technology is being created as to having the optical recording scheme of future generation of the data that surmount traditional DVD and many other digital devices greatly.
Therefore, also at the optical reproducing apparatus of Application and Development Blu-ray disc (BD) standard.Yet, because Blu-ray disc (BD) standard still remains to be finished, so in the process of the complete optical reproducing apparatus of exploitation, have many difficulties.Particularly in order to reproduce data from Blu-ray disc (BD) effectively, main AV data not only should be provided and make things convenient for the required various data of user, such as caption information as the supplementary data relevant with main AV data, and answer systematization and management information is provided, be used for reproducing the general data and the caption data that are recorded in CD.
Yet, in existing Blu-ray disc (BD) standard, because the supplementary data standard complete unity as yet of subtitle stream files particularly, so in comprehensive research and development, have many restrictions based on the optical reproducing apparatus of Blu-ray disc (BD).And these restrictions can cause some problems in the process that the supplementary data such as captions is provided to the user.
Summary of the invention
Therefore, the present invention relates to a kind of recording medium, method and apparatus that is used to reproduce text subtitle stream, it has avoided one or more problems of causing owing to the restriction of correlation technique and shortcoming basically.
An object of the present invention is to provide and be used for text subtitle stream is recorded in method and apparatus such as the recording medium of Blu-ray disc, and be provided for the method and apparatus of the text subtitle stream of reproducing recorded.
Another object of the present invention provides the method for creation-time information when recording text subtitle streams on recording medium.
Another purpose of the present invention provides the method and apparatus that is used to reproduce text subtitle stream, and it can reproduce text subtitle stream effectively.
The part of other advantage of the present invention, purpose and feature will be set forth in the following description, and a part will become apparent after those of ordinary skills read following explanation, perhaps can recognize from the practice of the present invention.Purpose of the present invention and other advantage can realize by the structure that particularly points out in printed instructions and claim and accompanying drawing and obtain.
In order to realize these purposes and other advantage, and according to embodying the also purposes of the present invention of broad description in this article, the recording medium that is used to reproduce text subtitle stream comprises: first data field that is used to store playlist (PlayList), this playlist comprises a group of playltems (PlayItem) and son is play (SubPlayItem), each is play item and all is configured to reproduce at least one main AV stream, son is play item and is configured to reproduce text subtitle stream, and this son broadcast item comprises the synchronizing information that present start time of indication broadcast item on length of a game's axle of playlist; And second data field that is used to store at least one main AV stream and text subtitle stream, if random access playlist on the random access time on length of a game's axle wherein then presents the dialogue with immediate time beginning of conversation after son is play corresponding random access time on the time shaft and presents fragment.
In another aspect of this invention, the method that is used for reproducing text subtitle stream comprises: read the group of playltems that is included in the playlist that is recorded on the recording medium and a son and play, each broadcast item all is configured to reproduce at least one main AV stream, and son is play item and is configured to reproduce text subtitle stream; Read the synchronizing information that is included in the son broadcast item, this synchronizing information indication is play the start time that presents on length of a game's axle of playlist, if and on the random access time on length of a game's axle the random access playlist, then present dialogue and present fragment with immediate time beginning of conversation after son is play corresponding random access time on the time shaft.
In still another aspect of the invention, the device that is used to reproduce text subtitle stream comprises: microcomputer, it is configured to read the group of playltems and the son that are included in the playlist that is recorded on the recording medium and plays item, and read and be included in the synchronizing information of son in playing, each is play item and all is configured to reproduce at least one main AV stream, son is play and to be configured to reproduce text subtitle stream, and synchronizing information indication is play the start time that presents on length of a game's axle of playlist; And text subtitle decoder, it is configured to be coupled with microcomputer, be used for decoding text subtitle streams, if random access playlist on the random access time on length of a game's axle wherein, then the text subtitle decoder decoding has the dialogue of immediate time beginning of conversation after son is play corresponding random access time on the time shaft and presents fragment.
This aspect on the other hand in, the method that is used for reproducing text subtitle stream comprises: read the group of playltems that is included in the playlist that is recorded on the recording medium and a son and play, each broadcast item all is configured to reproduce at least one main AV stream, and son is play item and is configured to reproduce the text subtitle stream that is written into impact damper; Read and be included in the synchronizing information of son in playing, this synchronizing information indication is play the start time that presents on length of a game's axle of playlist; When on the random access time on length of a game's axle during the random access playlist, calculate the corresponding random access time on its time shaft of playing item at son, from entrance (EP) mapping, select a Data Position, selected Data Position and the son that equals to be calculated play on the item time shaft random access time or following closely to present time stamp corresponding; And the dialogue that presents in the selected data position that is stored in the impact damper presents fragment.
Should understand of the present invention is exemplary and indicative in preceding general introduction and following detailed description, and aims to provide the further explanation to the present invention for required protection.
Description of drawings
Included with provide to further understanding of the present invention, and the combined accompanying drawing that wherein constitutes the application's a part each embodiment of the present invention is shown, and be used from instructions one and explain principle of the present invention.In the accompanying drawings:
Fig. 1 illustrates the structure that is recorded in the data file in the high density compact disc according to of the present invention;
Fig. 2 illustrates the data storage area according to high density compact disc of the present invention;
Fig. 3 illustrates text subtitle and the master image that is presented on the display screen according to of the present invention;
Fig. 4 illustrates the synoptic diagram according to the reproducing control of text subtitle stream of the present invention;
Fig. 5 A illustrates the application that is used to reproduce the reproduction control information of text subtitle stream according to of the present invention to 5C;
Fig. 6 illustrates the dialogue of formation according to text subtitle stream of the present invention, and with the relation of presentative time;
Fig. 7 illustrates the structure according to text subtitle stream of the present invention;
Fig. 8 illustrates one group of subpath (SubPath) information in the reproducing control fileinfo, is used to control the reproduction according to text subtitle stream of the present invention;
Fig. 9 A illustrates according to text subtitle stream and the synchronous method of main AV stream of making of the present invention;
Fig. 9 B illustrates the method according to the random access between realization text subtitle file of the present invention and the main AV stream;
The method of preload text subtitle stream and corresponding font information when Figure 10 is illustrated in and reproduces text subtitle stream according to the present invention;
Figure 11 illustrates the structure according to text subtitle decoder of the present invention;
Figure 12 A and 12B are illustrated in the mapping table that is used to reproduce text subtitle stream in the method for reproducing text subtitle stream according to the present invention; And
Figure 13 illustrates the mapping table that is recorded in according to the present invention on the CD.
Embodiment
Now will be in detail with reference to preferred embodiment of the present invention, its example is shown in the drawings.Under possible situation, all indicating same or analogous parts with identical label in the accompanying drawing.In addition, though the term that uses among the present invention is selected from term well-known and that used, some term of mentioning in the instructions of the present invention is selected according to his or her judgement by the applicant, and its detailed meanings is described in the relevant portion of this instructions.In addition, the present invention needs not only to understand according to employed actual terms and according to the meaning that is contained in each term.
In this detail specifications, " recording medium " refers to all types of media of energy record data, no matter and comprise all types of media of taking which kind of recording method widely, such as CD, tape etc.Hereinafter, in order to simplify explanation of the present invention, a CD particularly example of " Blu-ray disc (the BD) " recording medium that will propose as this paper provides.Yet the recording medium that the spirit or scope of the present invention can be applied to comparably other type is conspicuous.
In this detail specifications, " master data " expression belongs to audio/video (AV) data that are recorded in the title (for example movie title) in the CD by the author.Usually, the AV data also usually are called as AV stream or main AV stream with the MPEG2 format record.In addition, all required other data of master data are reproduced in " supplementary data " expression, and its example is text subtitle stream, interactive graphic stream, present graphical stream and supplementary audio streams (for example, but be used for browsable slide shows).These supplementary data stream can be used MPEG2 form or any other data layout record.They can flow multiplexed with AV or can exist as independent data files in CD.
" captions " expression is corresponding to the caption information of the video that is reproduced (image) data, and its available scheduled instruction is represented.For example, when when the user is watching image on the display screen, selecting to watch the option of one of a plurality of captions with various language representations, be displayed on the predetermined portions of display screen corresponding to the caption information of selected captions.If shown caption information is text data (a for example character), then selected captions often are called as " text subtitle ".According to an aspect of the present invention, the text subtitle stream of a plurality of MPEG2 forms can be recorded in the CD, and they can be used as a plurality of independently stream files existence.Each " text subtitle stream files " is created and is recorded in the CD.And, the object of the present invention is to provide a kind of method and apparatus that is used for the text subtitle stream files of reproducing recorded.The most in particular, synchronous by making text subtitle stream and master data (AV stream), the present invention proposes to provide the method with the synchronous text subtitle stream of master data (AV stream) and the method for permission random access to the user.
Fig. 1 illustrates the file structure that is recorded in the data file in the Blu-ray disc (hereinafter referred to as " BD ") according to of the present invention.Referring to Fig. 1, comprise at least one BD catalogue (BDMV) in the root directory (root).Each BD catalogue comprises index file (index.bdmv) and obj ect file (MovieObject.bdmv), is used for and one or more user interactions.For example, but index file can comprise the data of concordance list that expression has a plurality of choice menus and movie title.Each BD catalogue also comprises four file directorys, and they comprise audio/video (AV) data and the required various data of reproduction of AV data that will reproduce.
Included file directory is stream catalogue (STREAM), clip information directory (CLIPINF), playlist directory (PLAYLIST) and auxiliary data directory (AUXDATA) in each BD catalogue.At first, stream catalogue (STREAM) comprises audio/video (AV) stream file with format.For example, the AV stream file can be the form of MPEG2 transmission grouping, and is named as " * .m2ts ", as shown in Figure 1.This stream catalogue also can comprise one or more text subtitle stream files, and wherein each text subtitle stream files comprises text (for example character) data of the text subtitle of representing with language-specific and the reproduction control information of text data.Text subtitle stream files conduct independently stream file is present in the stream catalogue, and can be named as " * .m2ts " or " * .txtst ", as shown in Figure 1.Included AV stream file or text subtitle stream files often is called clip stream file in the stream catalogue.
Then, clip information directory (CLIPINF) comprises the clip information file that corresponds respectively to all stream files (AV or text subtitle) included in the stream catalogue.Each clip information file comprises the attribute of respective streams file and reproduces timing information.For example, clip information file can comprise map information, wherein presents time stamp (PTS) and source packet number (SPN) is an one-to-one relationship, and shines upon by entrance mapping (EPM) according to clip type.Therefore, according to the present invention relevant with the text subtitle stream example that comprises and be not included in the map information in the clip information file (* .clpi) with reference to the accompanying drawings 10A describe in detail in the process in the back to Figure 11.
Use this map information, the ad-hoc location of stream file can be according to by playing or son is play one group of timing information that item provided (entry time In-time and jump out time Out-time) and determined, and is as described below.In industrial standard, each file that is made of stream file and its respective clip message file is to all being designated as a montage.For example, included 01000.clpi comprises the attribute of 01000.m2ts included among the STREAM and reproduces timing information among the CLIPINF, and 01000.clpi and montage of 01000.m2ts formation.
Referring again to Fig. 1, playlist directory (PLAYLIST) comprises one or more play list file (* .mpls), and wherein each play list file comprises at least one broadcast item, and it specifies the recovery time of at least one main AV montage and this main AV montage.More specifically, the broadcast item comprises specifies entry time and jumps out the information of time, and this information representation is by the reproduction start and end time of the main AV montage of playing Clip_Information_File_Name (clip information file name) appointment in the item.Therefore, play list file is represented the basic reproduction control information of one or more main AV montages.In addition, play list file also can comprise son broadcast item, and its expression is used for the basic reproduction control information of text subtitle stream files.Group is play item and is included in the playlist when reproducing one or more text subtitle stream files, and this son is play and play synchronously.On the other hand, but when group is play item and is used for reproducing browsable slide shows, it can not with play synchronously.According to the present invention, the major function of son broadcast item is to control the reproduction of one or more text subtitle stream files.
Therefore, main path refers to by a path of using at least one included in play list file broadcast item to reproduce master data, and subpath refers to text subtitle stream is reproduced as the path of supplementary data.More specifically, main path must be included in the play list file, and when supplementary data exists, comprise at least one subpath for each attribute of corresponding one group of supplementary data.Thereby, describe the reproduction of using main path and subpath in detail in the process in the back with reference to Fig. 4.At last, auxiliary data directory (AUXDATA) can comprise supplementary data stream files, its example be font file (for example, aaaaa.font or aaaaa.otf), pop-up menu file (not shown) and being used to produce click sound audio files (for example, Sound.bdmv).Above-mentioned text subtitle stream files can be included in auxiliary data directory but not flow in the catalogue.
Fig. 2 illustrates according to optical disc data of the present invention memory block.Referring to Fig. 2, CD comprises the file system information area that takies the inside part of coiling, take the stream district of the outermost part of coiling and take database community between file system information area He Liu district.In file system information area, storage is used to manage the system information of entire data files shown in Figure 1.Then, master data and supplementary data (that is, AV stream and one or more text subtitle stream) are stored in the stream district.Master data can comprise voice data, video data and graph data.And supplementary data (that is, text subtitle) is separately stored in the stream district, and not multiplexed with master data.General file shown in Figure 1, play list file and clip information file are stored in the database community of coiling.As mentioned above, general file comprises index file and obj ect file, and play list file and clip information file comprise AV stream and the required information of text subtitle stream that is stored in the stream district of reproducing.Use is stored in the information in database community and/or the stream district, and the user can select specific playback mode, and reproduces main AV and text subtitle stream with selected playback mode.
To describe structure below in detail according to text subtitle stream files of the present invention.At first, redetermination is used to reproduce the control information of text subtitle stream.Thereby be the detailed description of the method and apparatus of the method and being used to of creating the text flow file of the control information the comprise redetermination stream file that reproduces the text subtitle stream reproducing recorded then.Fig. 3 illustrates text subtitle and the master image that is presented on according to the present invention on the display screen.When reproduced in synchronization master AV stream and corresponding text caption stream, this master image and text subtitle are simultaneously displayed on the display screen.Therefore, text subtitle stream must provide in mode synchronous in master data, and the synchronous method of text subtitle stream and master data will be proposed in the present invention.
Fig. 4 is the synoptic diagram that illustrates according to the reproducing control of main AV montage of the present invention and text subtitle clip.Referring to Fig. 4, play list file comprises at least one son broadcast item of playing item and controlling the reproduction of a plurality of text subtitle clip of the reproduction of controlling at least one main AV montage.More specifically, at least one is play and to be included in the play list file, as the main path of the reproduction that is used to control master data (promptly main montage).And when the corresponding text caption stream existed in master data, text subtitle stream was play a control as the subpath quilt.For example, referring to Fig. 4, text subtitle clip 1 (English) and text subtitle clip 2 (Korean) can be play a reproduction and control by single son.And text subtitle clip 1 and text subtitle clip 2 are synchronous with master data separately, thereby main title and master data are simultaneously displayed on the display screen at the presentative time of expection.
In order on display screen, to show text captions, need display control information (for example position and size information) and presentative time information, its example at Fig. 5 A to shown in Fig. 5 C.Then, included various information describe in detail to Fig. 7 with reference to Fig. 5 A in the text subtitle stream.And, make text subtitle stream and master data synchronously and allow the method for random access to describe in detail with reference to Fig. 8 to 11.
Fig. 5 A illustrates the dialogue that presents according to the present invention on display screen.Conversational guidance is shown in the entire text subtitle data that shows on the display screen during the given presentative time, so that the reproducing control of text subtitle stream.Usually, the presentative time of dialogue can be with presenting time stamp (PTS) expression.More specifically, the PTS that is used to reproduce a dialogue partly comprises " dialog_start_PTS (the beginning of conversation PTS) " and " dialog_end_PTS (end-of-dialogue PTS) " of each dialogue.In addition, for example, the PTS (k) (being dialog_start_PTS) that is presented on that talks with shown in Fig. 5 A locates beginning, and locates to finish at PTS (k+1) (being dialog_end_PTS).Therefore, when the conversational guidance shown in Fig. 5 A is shown in when being presented at the text subtitle data of whole unit on the display screen between PTS (k) and the PTS (k+1), entire text subtitle data is defined by same dialogue.At this, dialogue comprises 100 character codes at most in a text subtitle.
In addition, Fig. 5 B illustrates a plurality of zones according to dialogue of the present invention.The segmentation part of the text subtitle data that region representation shows on display screen during given presentative time (dialogue).In other words, dialogue comprises at least one zone, and each zone can comprise delegation's captioned test at least.Can on display screen, show this regional entire text subtitle data of expression according to the region style of distributing to a zone (global style).Should determine to be included in maximum number of regions in the dialogue according to the potential solution bit rate of caption data, because the many more decoding rates that cause usually of number in zone are low more.For example, maximum number of regions of a dialogue can be restricted to 2, to realize rational higher decode rate.
Fig. 5 C illustrates the style information according to a plurality of zones of dialogue of the present invention.Style information represents to define the information of the required attribute of at least a portion of showing included zone in the dialogue.Some example of style information is position, area size, background color, text justification, text flow information or the like.Style information can be categorized into region information style information (global style) and inline style information (local style information).
The region style (global style) in the whole zone that the region information style information definition is applied to talk with.For example, but the regional location of region information style information inclusion region, area size, font color, background color, text flow, text justification, line space, font name, font and font size one of at least.For example, shown in Fig. 5 C, two different region style are applied to regional 1 and regional 2.Have position 1, size 1 and the region style of blue background color and be applied to zone 1, and the zones of different pattern with position 2, size 2 and red background color is applied to zone 2.
On the other hand, the inline style information definition is applied to the inline style (local pattern) of the specific part of text string included in the zone.For example, inline style information can comprise font type, font size, font and font color one of at least.The specific part of text string can be the interior whole line of text in zone or the specific part of this article one's own profession.Referring to Fig. 5 C, particular inline style is applied to included textual portions " mountain " in the zone 1.In other words, the font type of this specific part of text string, font size, font and font color is one of at least different with the remainder of text string in the zone 1.
Fig. 6 illustrates the method for creating each dialogue that is applied to each presentative time (PTS) part.For example, when having 4 dialogues between PTS6 at PTS1, dialogue # 1 is shown as text data text # 1 between PTS1 and PTS2.And dialogue # 2 is included in 2 zones between PTS2 and the PTS3 (zone 1 and zone 2), and wherein zone 1 is shown as text data text # 1 and zone 2 is shown as text data text #2.In addition, dialogue # 3 is shown as text data text # 2 between PTS3 and PTS4, and dialogue # 4 is shown as text data text # 3 between PTS5 and PTS6.Referring to Fig. 6, text subtitle data does not exist between PTS4 and PTS5.In the method that is used for creating above-mentioned each dialog information, each dialogue must comprise timing information (being the PTS group), style information and the actual text data (hereinafter being called " dialogue data ") that are used to show respective dialog.
Therefore, as mentioned above, shown timing information (being the PTS group) is registered as " dialog_start_PTS " and " dialog_end_PTS ".This style information is defined as above-mentioned global style (Global_Style_Info) and local style information (Local_Style_Info).Yet in the present invention, style information will be registered as region style (region_style) and inline style (inline_style).In addition, the text data that shows on the actual displayed screen is recorded in the dialogue data.More specifically, comprise two zones (zone 1 and zone 2) because talk with #2, institute thinks that regional 1 and regional 2 write down one group of style information and dialogue data separately.
Fig. 7 illustrates according to text subtitle stream files of the present invention (for example, shown in Figure 1 10001.m2s).Text subtitle stream files can be made of the MPEG2 transport stream that comprises a plurality of transmission groupings (TP), and all transmission groupings all have identical packet identifier (for example, PID=0xl8xx).When disk player received the many inlet flows that comprise particular text subtitle stream, it found all transmission groupings that belong to text caption stream with their PID.Referring to Fig. 7, each subclass of transmission grouping constitutes the basic stream of grouping (PES) grouping.One of PES grouping shown in Figure 7 is corresponding to the dialog style segment (DSS) of one group of region style of definition.All the other PES groupings of after the 2nd PES grouping all present fragment (DPS) corresponding to dialogue.
In the text subtitle stream structure of above-mentioned Fig. 7, Fig. 5 A represents that to 5C and each dialog information shown in Figure 6 a dialogue presents fragment (DPS).And, included style information is represented one group of information in the dialog information, and any and inline style that it is linked at a plurality of region style set (also can be described as " region_style_id (region style id) ") of definition in the dialog style segment (DSS) connect.Standardized a limited number of region style set is recorded in the dialog style segment (DSS).For example, write down 60 groups of specific style information at most, its each group is described by region_style_id.
Fig. 8 illustrates the syntactic structure according to subpath of the present invention and son broadcast item.At this, it is not the reproduction that only is used to control text subtitle stream that subpath and son are play item.On the contrary, subpath is according to the sub paths types definition and reproduces the different supplementary data that comprises text subtitle stream with the purpose that son is play item, described in process in the back.Therefore, when specific fields and text subtitle stream are irrelevant or when specific fields is used in the text subtitle stream, the interior specific fields of syntactic structure that subpath and son are play will be defined as having particular value.
More specifically, referring to Fig. 8, SubPath () sentence structure specify be included in single playlist in the path of the supplementary data that is associated of master data.SubPath () sentence structure comprises SubPath_type field, is_repeat_SubPath field, number_of_SubPlayItems field and SubPlayItem (i) field.At this, the SubPath_type field is specified the type of subpath.But SubPath_type=2 represents the browsable slide shows of supplementary audio, and SubPath_type=3 represents that interactive graphics presents menu, and SubPath_type=4 represents that text subtitle presents.Therefore, can determine which class montage is controlled by each corresponding subpath by the SubPath_type field according to optical recording of the present invention and transcriber.In addition, the number_of_SubPlayItems field is represented the number of son broadcast item included in the subpath.At this, optical recording and transcriber can be play the number of item by son controlled in the specific subpath of number_of_SubPlayItems field verification.The is_repeat_SubPath field is represented one group of 1 byte flag information, is used for verification and whether reuses corresponding subpath.More specifically, when is_repeat_SubPath=0b, do not reuse subpath, and when is_repeat_SubPath=1b, reuse subpath.
Therefore, when controlling the reproduction of text subtitle stream by the use subpath, SubPath_type=4, number_of_SubPlayItems=1, and is_repeat_SubPath=0b.In other words, in the subpath of control text subtitle stream, single son is play a reproduction (for example as shown in Figure 4) of the single text subtitle stream of control, and does not reuse subpath.Therefore, when but the browsable slide shows with supplementary audio is reproduced as SubPath_type=2, and when interactive graphic presentation menu stream is rendered as SubPath_type=3, can differently define and use number_of_SubPlayItems field and is_repeat_SubPath field.
The detailed syntax of SubPlayItem (i) field will be described in addition.The Clip_Information_file_name field is used as appointment and plays an information of the filename of the stream of control by corresponding son, and the Clip_codec_identifier field is represented the coded format of specified montage.As mentioned above, because text subtitle information according to the present invention is with MPEG-2 form coding, so the Clip_codec_identifier field is defined as Clip_codec_identifier=M2TS.In addition, SubPlayItem_IN_time field and SubPlayItem_OUT_time field are used as and specify the information of reproducing start time and reproduction end time in the specified montage.Therefore, as shown in Figure 1, SubPlayItem_IN_time and SubPlayItem_OUT_time are changed to a group address message (being also referred to as source packet number (SPN)) in specified clip information file (* .clpi), so that judge the reproducing part in the actual montage.In addition, the ref_to_STC_id field represents to judge the information of the position of seamless reproduction unit in specified montage that is applied to reproducing part.Therefore, text subtitle stream constitutes seamless reproduction unit by using individual system clock (STC) (being also referred to as " 1STC_sequence ").
The is_multi_clip_entries field is one group of 1 byte flag information, represents that numerous clip entries are by a corresponding son broadcast control.For example, referring to Fig. 4, because playing when item is controlled 2 text subtitle clip, single son has a plurality of montages, so is_multi_clip_entries=1b.Therefore, when is_multi_clip_entries=1b, there are at least two clip entries, and in this case, distribute subclip_entry_id to each clip entries, and to specific Clip_information_file_name field, Clip_codec_identifier field and the ref_to_STC_id field of each subclip_entry_id definition.
At last, be used for being included in son with the synchronous one group of information of master data and play in the sentence structure, wherein this information comprises sync_PlayItem_id field and sync_start_PTS_of_PlayItem field.More specifically, sync_PlayItem_id field and sync_start_PTS_of_PlayItem field are only just used when item is carried out by using son to play in the reproducing control of text subtitle stream.Therefore, when but the browsable slide shows with supplementary audio is reproduced as SubPath_type=2, and when interactive graphics being presented menu stream be reproduced as SubPath_type=3, sync_PlayItem_id field and sync_start_PTS_of_PlayItem field become unnecessary information, and in this case, respective field is set to ' 00h '.
When describing sync_PlayItem_id field and sync_start_PTS_of_PlayItem field, describe according to the synchronizing information that is used to reproduce text subtitle stream of the present invention with reference to Fig. 9 A and Fig. 9 B.At first, text subtitle stream and master data is synchronous, and judge according to sync_PlayItem_id field and sync_start_PTS_of_PlayItem field with the reproduction start time of the synchronous text subtitle stream of master data.More specifically, the sync_PlayItem_id field is to specify specific one group of information playing during in play list file at least one play.And the sync_start_PTS_of_PlayItem field is specified specific interior one a group of information playing a PTS that the reproduction start time of text subtitle stream is appointed as of playing.For example, referring to Fig. 9 A, at the son broadcast item that is used for reproducing text subtitle stream, as being used to judge and the information of reproduction start time of the synchronous text subtitle stream of master data that sync_PlayItem_id field and sync_start_PTS_of_PlayItem field can be defined as sync_PlayItem_id=0 and sync_start_PTS_of_PlayItem=t1.More specifically, use the specified point of playing in 1 (PlayItem_id=0) " t1 (PTS) " that is reproduced in of the text subtitle stream of son broadcast item to begin.
The second, text subtitle stream is used as system clock with the counter of 90 KHz (khz).And the initial value of counter is that as shown in Figure 7 first dialogue presents the dialog_start_PTS in the fragment (DPS# 1).More specifically, be different from other stream, text subtitle stream does not have the timer reference of programs (PCR) as initial value.Therefore, to present all PTS (dialog_start_PTS and the dialog_end_PTS) value in the fragment (DPS) all be to count and judge by present dialog_start_PTS in the fragment (DPS#1) from first dialogue to subsequent dialog.
Therefore, the reproduction of text subtitle is from the time according to sync_PlayItem_id field and the judgement of sync_start_PTS_of_PlayItem field.Then, have the system clock counter of 90 KHz (kHz) that presents the identical initial value of the dialog_start_PTS in the fragment (DPS#1) with first dialogue, be used to present each dialogue of PTS (dialog_start_PTS and dialog_end_PTS) value reproduction of each dialogue of definition fragment (DPS) in according to included dialogue in text subtitle stream.Then, being reproduced in the dialog_end_PTS that last included dialogue presents in the fragment (last DPS) in the text subtitle stream finishes.
The 3rd, referring to Fig. 9 B, but random access text subtitle stream and main AV stream.More specifically, comprise can be by one group of temporal information of user ID for play list file.This group temporal information included initial broadcast start time (for example In_time0) that presents that (for example playing a #0) is interior from play list file begins, and is defined as consecutive hours countershaft (being also referred to as " length of a game's axle of playlist ").For example, shown in Fig. 9 B, when the random access time of user expectation appeared in the reproducing part of playing a #0 on length of a game's axle of playlist, main AV stream began to reproduce from this random access time.And, as mentioned above, this be because this broadcasts to present (or reproduction) time identical with length of a game's axle of playlist.On the contrary, as mentioned above, the special time (t1) in text subtitle stream and the main AV stream is synchronous, and this special time (t1) is with to present beginning (or reproducing initial) time (In_time0) different.Therefore, text subtitle stream is gone up reproduced at different time shaft (hereinafter being called " time shaft that text subtitle presents ").Therefore, in order synchronously to reproduce text caption stream, need following treatment step with the random access time of user expectation.
At first, need be converted to time value on the time shaft that text subtitle presents (son play) random access time on length of a game's axle of playlist.Therefore, the time value on the time shaft that presents of text subtitle can deduct by the random access time from length of a game's axle son play the sync_start_PTS_of_PlayItem of indication obtain.In order to simplify description of the invention, the time value of calculating on the time shaft that text subtitle presents is defined as " RAT_TXTST ".Subsequently, the dialog_start_PTS in the value of obtaining (RAT_TXTST) and each DPS is made comparisons, so that the value of obtaining (RAT_TXTST) first dialog_start_PTS afterwards begins to reproduce text subtitle stream from being present in.In other words, to present fragment (DPS) all be a random access point in the text subtitle stream in each dialogue.Therefore, if random access one playlist then should present and has on the time shaft that text subtitle presents the DPS of immediate dialog_start_PTS after random access time.
Figure 10 illustrates the method and apparatus that is used to reproduce text subtitle stream according to of the present invention to Figure 13, especially shows the method for specific DPS in search or the random access text subtitle stream.Figure 10 illustrate according to of the present invention when reproducing text subtitle stream the method for preload text subtitle stream and corresponding font information.Referring to Figure 10, comprise main AV montage and text subtitle clip by the list-directed fragment of each played column.Each main AV montage comprises main AV stream and corresponding control information thereof, and each text subtitle clip and main AV montage are synchronous.More specifically, main AV montage is controlled by playing item, and text subtitle clip is play a control by son.In addition, play and son is play item and controlled the reproduction of montage by the start and end time (entry time and jump out the time) that presents of using each respective clip separately.
In addition, as mentioned above, can in single playlist, comprise a plurality of text subtitle streams (or montage) of various language.Therefore, can change or be transformed into the text subtitle stream of another kind of language according to user's selection (or selecting) corresponding to the text subtitle stream of the language-specific in the broad range language of a plurality of text subtitles.In addition, seamless-reproduced in order to carry out in the conversion of text subtitle stream or between tour, each of a plurality of text subtitle streams (or montage) all is required to be preloaded in the impact damper (label 10 of Figure 11).In other words, when all text subtitle streams all are preloaded in the independent impact damper and are used, can only read and use text subtitle data easily, thereby be convenient to the control of impact damper.On the contrary, when preload text subtitle data not and corresponding font file, at text subtitle data and the corresponding font file of reading and recording in different text subtitle stream files (different physical region) constantly during the playback of playlist, thus the problem when causing controlling these processes.
At this moment, the text subtitle stream that is preloaded into impact damper preferably is created as and is equal to or less than predetermined normal size.Therefore, expression equals based on the size of a text subtitle stream of one group of language message of the film of 2 hour projection time: 2000 captions/film * 2 row/captions * 30 characters per line * 2 byte/word symbol=240kB.And the other 240kB of the style information of the size of final impact damper by will being used to create above-mentioned text subtitle stream adds that the size of text subtitle stream forms, and makes total size be no more than about 0.5MB.Therefore, with reference to Figure 10, in the time will storing 3 text subtitle streams, need 3*0.5MB=1.5MB.Simultaneously, as shown in figure 10, be preferably in the playback playlist preload of execution contexts caption stream on the borderline region between the playlist before.In other words, text subtitle stream should be before reproducing main AV stream preload in advance.
Figure 11 illustrates the device that reproduces text subtitle stream according to the present invention.Referring to Figure 11, this device comprises subtitle preload buffer (SPB) 10, font preload buffer (FPB) 20, text subtitle decoder 30, graphics plane 40, color look-up table (CLUT) 50 and microcomputer 60.At this, the whole of text subtitle stream are preloaded in the subtitle preload buffer (SPB) 10, and are preloaded in the font preload buffer (FPB) 20 with the corresponding font information of text caption stream.Graphics plane 40 is used to regulate the picture that is showing.And color look-up table (CLUT) 50 is provided for regulating the controlling value of transparency with form.
To describe the coding/decoding method of carrying out by device shown in Figure 11 now in detail.When being written into CD, microcomputer 60 reads and is used to reproduce the required fileinfo of data stream that is recorded on the CD.Then, when microcomputer 60 receives the specific title reproduction command of user, reproduce and replaying user is wanted this title and the corresponding playlist thereof that reproduce.More specifically, when the playback playlist, the audio/video decoder (not shown) reproduces by playing the main AV stream of each of control.And in play a text subtitle stream of control by son, the stream (such as the text subtitle clip of creating with the Korean 1) of the language-specific of being selected by the user is stored in the subtitle preload buffer 10.Simultaneously, depend on the font information of appointment in the clip information included in text subtitle clip 1, specific font file (aaaaa.font for example shown in Figure 1 or aaaaa.otf) is read from CD and is stored in the font preload buffer 20.
As mentioned above, when finishing all operations and show that on screen a main AV who is controlled by the broadcast item flows, the decode procedure that starts text subtitle stream is so that provide its corresponding text subtitle to main flow.In addition, present start time and master data reproduced in synchronization through the text subtitle stream of decoding what judge according to synchronizing information, this synchronizing information is recorded in son and plays in the sync_PlayItem_id field and sync_start_PTS_of_PlayItem field of item, as shown in Figure 8.
A group of playltems and a son included in the playlist of microcomputer 60 reading and recording on recording medium are play item.It also reads this son and plays an interior included synchronizing information.Each is play and to be configured to reproduce at least one main AV stream, and son is play to be configured to reproduce and had the text subtitle stream that a plurality of dialogues that are preloaded in the SPB 10 present fragment.This synchronizing information indication is play the start time that presents on length of a game's axle of playlist.When the random access time of playlist on length of a game's axle during by random access, microcomputer 60 deducts by the random access time from length of a game's axle of playlist and indicatedly the synchronizing information presents the start time, calculates its corresponding random access time on the time shaft that son plays.The text subtitle decoder 30 that is coupled to microcomputer 60 then plays from having son that the dialogue of immediate time beginning of conversation presents fragment after random access time on the time shaft, and begin the dialogue of decode stored in SPB 10 and present fragment.This immediate beginning of conversation time representation equals or follows closely the time of the random access time on the son broadcast time shaft.
The decode procedure of text subtitle decoder 30 comprises three steps.In first step, the text subtitle stream information is separated based on application target, more specifically is divided into composition information, drafting information and dialog text information.This is called as " syntax analysis step ".In order to carry out this syntax analysis step, text subtitle (TXT-ST) processor 31 is set in the text subtitle decoder 30.Composition information of having separated and drafting information are stored in the dialog composition buffer (after this being called " DCB ") 35.And the dialog text information of having separated is stored in the dialog buffer (after this being called " DF ") 32.
In second step, text data included in the dialog text information of having separated is drawn into one group of data bitmap by using drafting information.At this, drafting information refers to the style information used when text subtitle stream is modified to data bitmap.In order to carry out plot step, text renderer 33 and dialogue present controller 36 and should be arranged in the text subtitle decoder 30.Then, in the separated dialog text information, text data is plotted as data bitmap during analyzing step.In addition, in order to carry out plot step, text renderer 33 receives the font information that is applied to corresponding text data from font preload buffer (FPB) 20, and text renderer 33 presents the drafting information that controller 36 receptions are applied to corresponding text data from dialogue then.Subsequently, text renderer 33 is used the inline style information of each string that is applied to corresponding text data included in the dialog text, thereby text data is plotted as data bitmap.Then, text renderer 33 is stored in the result of drawing process in the bitmap object buffer (BOB) 34.
The 3rd and last step in, be added to graphics plane (GP) as the text data of the final drafting of data bitmap by using composition information, thereby finish the reproduction of text caption stream.Composition information refers to the specify text captions information of the demonstration time on screen.In order to carry out composition step, above-mentioned dialogue presents (DP) controller 36 and should be set in the text subtitle decoder 30.Then, by realizing plot step, be stored in bitmap object in the bitmap object buffer (BOB) 34 according to composition information in graphics plane (GP) 40, sets type (or establishment).More specifically, in composition information, palette information is imported in the CLUT 50 so that change information as color.
As mentioned above, at reproduction period, be preloaded into text subtitle streams in the subtitle preload buffer (SPB) 10 may have to sometimes the selection done according to the user and requirement, by using the searched every now and then or random access of text subtitle stream decoder.And time stamp (PTS) Info Link (or connection) that presents that therefore map information will have the preload text subtitle stream arrives an address in the actual preload buffer.At this, map information is created by optical recording and/or transcriber itself, or is recorded in advance in the text subtitle clip information file included in this disc by the author of disc.Map information is described in more detail to Figure 13 with reference to Figure 12 A.
Figure 12 A and 12B illustrate the method for reproducing text subtitle stream according to the present invention, especially illustrate according to an example when creating map information by optical recording and/or transcriber of the present invention.Referring to Figure 12 A, text subtitle stream is that unit is stored in the subtitle preload buffer (SPB) 10 with DPS.Each DPS that stores is given (or distribution) entrance (being also referred to as " search point ").Therefore, distribute a address in the impact damper of the dialog_start_PTS (hereinafter being called " byte number (BN) ") of corresponding DPS and corresponding DPS to the entrance." EP_map " or " search list " controls each entrance with form.
Therefore, shown in Fig. 9 B, when judgement is used for the DPS of random access text subtitle stream, on EP_map, judge the address (being byte number (BN)) in the impact damper 10 of the corresponding DPS of preload wherein.Thereby text subtitle decoder is allowed to begin to present (or beginning to reproduce) from impact damper 10 these interior addresses.More specifically, what EP_map comprised DPS presents time stamp (PTS) value and each entrance byte number in impact damper, thereby is convenient to the desired locations of accessing text caption stream.When therefore, being preferably in the impact damper preload text subtitle stream or create EP_map before.
In addition, by using single subpath, can in a play list file, reproduce and control maximum 255 text subtitle clip.Therefore, synchronous with identical main AV stream by the text subtitle clip of same sub path control, each montage has different language or pattern.Therefore, in play list file in included a plurality of text subtitle clip, by being that in EP_map each text subtitle stream creates entrance, can in the shorter period, carrying out to differ from one another but flow change and conversion between the synchronous text subtitle stream with identical main AV.
Figure 12 B illustrates the improvement of Figure 12 A example shown and uses, wherein to a plurality of DPS but not a DPS distributes an entrance.In other words, distribute an entrance to per 5 to 10 seconds reproduction (or presenting) time interval, and in this case, between each entrance, comprise 2 DPS at least.Simultaneously, when carrying out when reproducing by text subtitle stream being preloaded into impact damper 10, and when execution contexts caption stream fractionation group (de-packetize) was handled after text subtitle stream being preloaded in the impact damper, the entrance should comprise and presents time stamp (PTS) information and source packet numbering (SPN) information.This is because text subtitle stream is to be stored in the subtitle preload buffer 10 with the transmission unit of being grouped into before the fractionation group of text subtitle stream is handled.
Figure 13 illustrates the method for reproducing text subtitle stream according to the present invention, an example when map information especially being shown recording in the CD by the author of CD.Referring to Figure 13, the main AV stream in the single playlist is by the broadcast item control that is included in the playlist.More specifically, play item and comprise presenting the start time (entry time) and presenting the temporal information of concluding time (jumping out the time) of the PlayItem_File_Name of requirement reproducing control and indication specified clip.Therefore, by EP_map type map information being recorded in by in the clip information file of playing a reproduction and control, PTS information can be converted into the source packet numbering (SPN) of main AV stream.By using this Same Way, text subtitle stream is play a control by the son that is included in the playlist, and the sentence structure that its neutron is play is with shown in Figure 8 identical.More specifically, the sentence structure play of son comprises presenting the start time (entry time) and presenting the temporal information of concluding time (jumping out the time) of the Clip_information_File_Name of requirement reproducing control and indication specified clip.Therefore, play in the clip information file of a reproduction and control by EP_map type map information being recorded in by son, PTS information can be converted into the source packet numbering (SPN) of main AV stream.Therefore, because this optical recording and/or transcriber can read and use the EP_map that provides in the clip information file included from CD, just do not need to create independent EP_map, shown in Figure 12 A and 12B for text subtitle stream.
As mentioned above, this recording medium, method and apparatus that is used to reproduce text subtitle stream has the following advantages.Text subtitle stream and master data are synchronous, so text subtitle stream and master data be by reproduced in synchronization, and text subtitle stream can be by random access.
Industrial applicibility
It will be apparent for a person skilled in the art that and to make various modifications and variations in the present invention and do not deviate from The spirit or scope of the present invention. Thereby the present invention is intended to cover change of the present invention and variation, as long as they fall within Get final product in the scope of claims and equivalents thereof.
Claims (21)
1. recording medium that is used to reproduce text subtitle stream, described recording medium comprises:
First data field of storage playlist, described playlist comprises a group of playltems and a son is play item, each is play item and all is configured to reproduce at least one main AV stream, son is play item and is configured to reproduce text subtitle stream, and described son broadcast item comprises the sub synchronizing information that present start time of item on length of a game's axle of playlist of playing of indication; And
Store second data field of at least one main AV stream and text subtitle stream, if random access playlist on the random access time on length of a game's axle wherein then presents the dialogue with immediate time beginning of conversation after son is play corresponding random access time on the time shaft and presents fragment.
2. recording medium as claimed in claim 1 is characterized in that, described son is play corresponding random access time on the time shaft and can be deducted the start time that presents of indicating the described synchronizing information by the random access time from described length of a game axle and calculate.
3. recording medium as claimed in claim 1 is characterized in that, described son is play in one of the selected reproduction time of the described group of playltems start time that presents at interval and begun it and present.
4. recording medium as claimed in claim 3 is characterized in that, described synchronizing information comprises first data field of the broadcast item ident value of indicating selected broadcast item, and sub second data field that presents the start time of playing item on the indication length of a game axle.
5. recording medium as claimed in claim 1 is characterized in that, described son play selected play present reach that son plays present the start time time begin it and present.
6. recording medium as claimed in claim 5 is characterized in that, described synchronizing information comprises first data field of the broadcast item ident value of indicating selected broadcast item, and sub second data field that presents the start time of playing item on the indication length of a game axle.
7. recording medium as claimed in claim 1 is characterized in that, described text subtitle stream comprises that a plurality of dialogues present fragment, and each dialogue presents fragment and comprises at least one region of dialog text.
8. recording medium as claimed in claim 7 is characterized in that, each dialogue presents fragment and specifies at least one region of dialog text to play start and end time that presents on the time shaft at son.
9. recording medium as claimed in claim 1 is characterized in that, described son is play item and comprised the data field of appointment corresponding to the title of the clip information file of text subtitle stream.
10. method that is used to reproduce text subtitle stream, described method comprises:
A group of playltems and a son included in the playlist of reading and recording on recording medium are play item, and each broadcast item all is configured to reproduce at least one main AV stream, and son broadcast item is configured to reproduce text subtitle stream;
Read and be included in the synchronizing information of son in playing, described synchronizing information indication is play the start time that presents on playlist length of a game axle; And
If random access playlist on the random access time on length of a game's axle then presents to have present fragment near the dialogue of time beginning of conversation after son is play corresponding random access time on the time shaft.
11. method as claimed in claim 10 is characterized in that, described son is play corresponding random access time on the time shaft and can be deducted the start time that presents of indicating the described synchronizing information by the random access time from described length of a game axle and calculate.
12. method as claimed in claim 10 is characterized in that, described son is play one of a selected reproduction time in the described group of playltems start time that presents at interval and is begun it and present.
13. method as claimed in claim 12 is characterized in that, described synchronizing information comprises first data field of the broadcast item ident value of indicating selected broadcast item, and sub second data field that presents the start time of playing item on the indication length of a game axle.
14. a device that is used to reproduce text subtitle stream, described device comprises:
Microcomputer, it is configured to read the group of playltems and the son that are included in the playlist that is recorded on the recording medium and plays item, and read and be included in the synchronizing information of son in playing, each is play item and all is configured to reproduce at least one main AV stream, son is play and to be configured to reproduce text subtitle stream, and synchronizing information indication is play the start time that presents on length of a game's axle of playlist; And
Be coupled to the text subtitle decoder of described microcomputer, described text subtitle stream is used to decode, if having the dialogue of immediate time beginning of conversation after son is play corresponding random access time on the time shaft, random access playlist on the random access time on length of a game's axle wherein, then described text subtitle decoder decoding present fragment.
15. device as claimed in claim 14, it is characterized in that described microcomputer calculates described sub corresponding random access time of playing on the time shaft by the start time that presents that the random access time from described length of a game axle deducts described son broadcast item.
16. device as claimed in claim 14 is characterized in that, described son is play in one of the selected reproduction time of the described group of playltems start time that presents at interval and is begun it and present.
17. device as claimed in claim 16 is characterized in that, described synchronizing information comprises first data field of the broadcast item ident value of indicating selected broadcast item, and sub second data field that presents the start time of playing item on the indication length of a game axle.
18. a method that is used to reproduce text subtitle stream, described method comprises:
A group of playltems that the playlist of reading and recording on recording medium is included and a son are play item, and each broadcast item all is configured to reproduce at least one main AV stream, and son broadcast item is configured to reproduce the text subtitle stream that is written into impact damper;
Read and be included in the synchronizing information of son in playing, described synchronizing information indication is play the start time that presents on length of a game's axle of playlist;
When on the random access time on length of a game's axle during the random access playlist, calculate its corresponding random access time on time shaft that son is play;
From entrance (EP) mapping, select a Data Position, selected Data Position and the son broadcast item number that equals to be calculated according to the random access time on the axle or following closely to present time stamp corresponding; And
The dialogue that presents in the selected data position that is stored in the impact damper presents fragment.
19. method as claimed in claim 18 is characterized in that, described son is play corresponding random access time on the time shaft and can be deducted the start time that presents of indicating the described synchronizing information by the random access time from described length of a game axle and calculate.
20. method as claimed in claim 18 is characterized in that, described son is play in one of the selected reproduction time of the described group of playltems start time that presents at interval and is begun it and present.
21. method as claimed in claim 20 is characterized in that, described synchronizing information comprises first data field of the broadcast item ident value of indicating selected broadcast item, and sub second data field that presents the start time of playing item on the indication length of a game axle.
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|---|---|---|---|
| KR20040018091 | 2004-03-17 | ||
| KR1020040018091 | 2004-03-17 | ||
| KR1020040022252 | 2004-03-31 |
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| CN1934645A true CN1934645A (en) | 2007-03-21 |
| CN100547670C CN100547670C (en) | 2009-10-07 |
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| CN109379641A (en) * | 2018-11-14 | 2019-02-22 | 腾讯科技（深圳）有限公司 | A kind of method for generating captions and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109379641A (en) * | 2018-11-14 | 2019-02-22 | 腾讯科技（深圳）有限公司 | A kind of method for generating captions and device |
| CN110418208A (en) * | 2018-11-14 | 2019-11-05 | 腾讯科技（深圳）有限公司 | A kind of subtitle based on artificial intelligence determines method and apparatus |
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