CN101023483A - Method and apparatus of reproducing data recorded on recording medium and local storage - Google Patents

Abstract

A device used for reproducing data recorded on a recording medium comprises: a pick-up unit, a local storage unit and a decoder. The pick-up unit reads master data recorded on the recording medium. The local storage unit is used for storing subdata relevant to the master data. The decoder is used for decoding the master data and the subdata by using play list file including a major path and a subpath. The major path comprises a play item used for playing back the master data, and the subpath comprises at least a sub-play item relevant to the play item, and is used for playing back subdata relevant to the playback of the master data. The subpath can comprise a single sub-play item or a plurality of sub-play items.

Description

Method and apparatus for reproducing data recorded on recording medium and local storage

technical field

The present invention relates to a recording medium, and in particular to a method and device for reproducing data recorded on the recording medium and local storage.

Background technique

Optical discs are widely used as recording media for recording large-capacity data. Recently, among various optical discs, new high-density optical recording media such as Blu-ray Disc (hereinafter referred to as "BD") are being developed for recording (or writing) and storing high-definition degree of video and audio data. Currently, as a next-generation optical recording scheme capable of having data significantly exceeding conventional DVDs, a global standard specification of Blu-ray Disc (BD) called a next-generation recording medium technology is under development along with various other digital devices. Accordingly, an optical recording and reproducing apparatus adopting the Blu-ray Disc (BD) standard is also under development. However, since the Blu-ray Disc (BD) standard has not been sufficiently perfected, there are many difficulties in developing a perfect optical recording and reproducing device.

In particular, in the above-mentioned optical recording and/or reproducing apparatus, basic functions of recording and/or reproducing Blu-ray Disc (BD) and additional functions involving use in conjunction with related peripheral digital devices are considered. Therefore, an optical recording and/or reproducing device generally must have the ability to receive an external input signal and display the received signal, or to use the external input signal for reproduction (or presentation or playback) together with a built-in Blu-ray Disc (BD) playback signal. function.

However, since a unified standard for implementing the above-mentioned additional functions has not been provided in the current Blu-ray Disc (BD) standard, there are many difficulties in developing a full-fledged Blu-ray Disc (BD)-based optical recording and reproducing apparatus. More specifically, a problem arises when attempting to reproduce both data existing outside a recording medium and data recorded in a recording medium such as a Blu-ray Disc as a single reproduction unit.

Contents of the invention

Accordingly, the present invention is directed to a method and apparatus for reproducing data recorded on a recording medium and local storage that substantially obviate one or more problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a method of configuring a reproduction management file for reproducing both data recorded in a high-density recording medium and data stored in a local storage.

Some of the other advantages, objectives and features of the present invention will be clarified in the following description, and some of them will become obvious to those skilled in the art by carefully reading the following content, or can be known from the practice of the present invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with the object of the present invention, as embodied and broadly described herein, a method of reproducing data recorded on a recording medium comprises: using a playback system comprising a main path and a sub-path The list file reproduces main data recorded on the recording medium and sub data stored in the local storage, wherein the main path contains one play item for playback of the main data, and the sub path contains at least one sub data associated with the play item. PlayItem to play back sub data in association with playback of main data.

In another aspect of the present invention, a method of reproducing data recorded on a recording medium includes: reproducing the main data recorded on the recording medium and stored in the local storage using a playlist file including a main path and a sub path. , wherein the main path contains a plurality of playitems for playback of the main data, and the subpath contains at least one subplayitem associated with the plurality of playitems to be associated with the playback of the main data The sub data is played back sequentially.

In another aspect of the present invention, a method of reproducing data recorded on a recording medium includes: reproducing the main data recorded on the recording medium and stored in the local storage using a playlist file including a main path and a plurality of sub paths. , wherein the main path contains one play item for playback of the main data, and each sub-path contains at least one sub play item associated with the play item for playback of the sub data in association with playback of the main data .

In another aspect of the present invention, an apparatus for reproducing data recorded on a recording medium includes: a pickup unit for reading main data recorded on the recording medium; a local storage for storing sub-data; and a decoder for decoding the main data and the sub-data by using a playlist file including a main path and a sub-path, wherein the main path contains a play item for playback of the main data, and the sub-path contains a play item related to the At least one sub-play item associated with the play item is used to play back the sub-data in association with the playback of the main data.

In another aspect of the present invention, an apparatus for reproducing data recorded on a recording medium includes: a pickup unit for reading main data recorded on the recording medium; a local storage for storing sub-data; and a decoder for decoding the main data and the sub-data by using a playlist file including a main path and a sub-path, wherein the main path contains a plurality of play items for playback of the main data, and the sub-path contains a plurality of play items related to At least one sub-play item associated with these play items is used to play back the sub-data in association with the playback of the main data.

In another aspect of the present invention, an apparatus for reproducing data recorded on a recording medium includes: a pickup unit for reading main data recorded on the recording medium; a local storage for storing sub-data; and a decoder for decoding the main data and the sub-data by using a playlist file including a main path and a plurality of sub-paths, wherein the main path contains a play item for playback of the main data, and the sub-path contains a play item related to the At least one sub-play item associated with the play item is used to play back the sub-data in association with the playback of the main data.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Description of drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention. In the attached picture:

Figure 1 shows an overview of the present invention;

2A and 2B show a recorded file structure and a structure of a playlist file as a reproduction management file reproducing the recorded file structure in the present invention;

3 shows a record structure of data recorded on a recording medium according to the present invention;

Figure 4 shows an optical recording and/or reproducing device according to the present invention;

5A and 5B illustrate a method and device for reproducing data recorded in a recording medium and data stored in a local storage according to the present invention;

6A to 6E show an example of configuring a subplay item among the methods of configuring a reproduction management file according to the present invention;

7A to 7D show examples of configuration subpaths among the method of configuring a reproduction management file according to the present invention;

8A to 8C show other examples of configuring subplay items in the method of configuring a reproduction management file according to the present invention;

9A to 9D show other examples of configuration subpaths in the method of configuring a reproduction management file according to the present invention; and

10A to 10F show the syntax of a reproduction management file according to the present invention.

Detailed ways

Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the specification of the present invention are selected by the applicant based on his or her judgment, and their detailed meanings are defined in the specification. described in the relevant section. Furthermore, it is required that the present invention be understood not simply by the actual terms used, but by the meaning implied by each term.

According to the present invention, a "reproduction management file" refers to a management file for reproducing both data recorded on a recording medium and data stored in local storage. More specifically, in a Blu-ray Disc (BD), a reproduction management file is called a "playlist". A detailed description of the reproduction management file will be made with reference to FIGS. 2A and 2B in conjunction with a description of the overall file structure. In other words, although "playlist" refers to a reproduction management file in the present invention, it is obvious that different terms may be used for recording media of different standards other than Blu-ray Disc (BD). However, it is also apparent that the technical scope of other recording media does not depart from the scope or spirit of the present invention.

Figure 1 shows an overview of the invention. More specifically, FIG. 1 shows an example of the combined use of the optical recording and/or reproducing device 10 and other peripheral devices. Accordingly, the "optical recording and/or reproducing apparatus 10" can record data on and/or reproduce data from optical discs of various standards. Depending on its design, the device can record/reproduce data on/from an optical disc of a specific standard, such as Blu-ray Disc (BD), or the device can simply reproduce data only from the optical disc. However, considering the fact that the Blu-ray Disc (BD) standard is expected to be perfected, and the association of Blu-ray Disc (BD) with other peripheral devices, Blu-ray Disc players (BD player) or a Blu-ray Disc recorder (BD recorder) that records data on a Blu-ray Disc (BD) are examples of the optical recording and/or reproducing device 10 according to the present invention. It is also apparent that the "optical recording and/or reproducing apparatus 10" may refer to a "drive" that can be equipped in a computer.

In addition to the function of recording and/or reproducing an optical disc, the optical recording and/or reproducing apparatus 10 according to the present invention also has the functions of receiving an external input signal and processing the received signal and displaying the signal by sending the processed signal to the screen through the display 20 The function that the signal provides to the viewer. In this case, there is no limitation on external signals that can be input. However, the most common external input signals are digital broadcast programs (DTV) or the Internet. More specifically, since the Internet is a medium that the public can easily access, users can utilize specific data provided on the Internet by downloading the data via the optical recording and/or reproducing apparatus 10 . When main data is recorded in an optical disc (i.e., BD) loaded in the optical recording and/or reproducing apparatus 10, and sub data associated with the main data exists in an external source such as the Internet, the present invention attempts to Combined with subdata to efficiently reproduce data.

To simplify the description of the present invention, "main data" refers to signals recorded in an optical disc, and "sub data" refers to signals existing in an external source other than the optical disc. However, these terms are not purely based on the method of obtaining the data, and master data and child data do not limit the data to a specific data type. Therefore, the main data generally includes audio data, presentation graphics (PG) data, text subtitles, interactive graphics (IG) data, and the like. In addition, without being limited to the above examples, other types of data existing in external sources associated with the main data may be used as sub data.

More specifically, when a video stream and an audio stream (for example, Korean) of a certain movie are recorded on an optical disc as main data, and an audio stream for a different language (for example, English) for the movie exists on the Internet as subdata , the user may wish to download the audio stream (English) as sub-data existing on the Internet and reproduce the downloaded audio stream (English) together with the video stream within the main data. In order to meet the user's request, it is necessary to determine the association between main data and sub-data, and a systematic method of managing (or controlling) and reproducing such data according to the user's request is required. The present invention seeks to provide a method to meet such needs.

In order to meet the user's requirements, a file structure associated with main data and sub-data is required, which will be described in detail with reference to FIGS. 2A to 3 . 2A and 2B and FIG. 3 show a file structure and a data recording structure usable for a recording medium according to the present invention. Referring to FIG. 2A in which a file structure for controlling control information recorded in a disc is shown, at least one BD directory (BDMV) is included in the root directory (root). Each BD directory includes an "index.bdmv" and a "MovieObject.bdmv", which represent common files used when interacting with one or more users. Each BD directory includes three file directories containing data to be reproduced and information necessary to reproduce the data. File directories included in each BD directory are a stream directory (STREAM), a playlist directory (PLAYLIST), and a clip information directory (CLIPINF).

The stream directory includes audio/video (AV) stream (hereinafter referred to as "AV stream") files. More specifically, AV streams (01000.m2ts, 02000.m2ts) may generally be in the form of MPEG2 transport packets and named "*.m2ts". In the BD standard, an AV stream is called a clip file, but in the description of the present invention, "main data" and "sub data" will be constituted as an AV stream file. In addition, the clip information directory (CLIPINF) includes clip information files (01000.clpi, 02000.clpi) corresponding to AV stream files (clip files) included in the stream directory.

The clip information file (*.clpi) includes attribute information and timing information of the corresponding AV stream. More specifically, the timing information includes mapping information that maps presentation time stamps (PTS) with source packet numbers (SPNs) using entry point mapping. In the BD standard, each pair of an AV stream (*.m2ts) and a corresponding clip information file (*.clpi) corresponding to each other one by one is called a clip. For example, 01000.clpi contained in CLIPINF includes attributes and timing information of 01000.m2ts contained in STREAM, and 01000.clpi and 01000.m2ts constitute one clip (Clip). In the present invention, "main clip" refers to a clip associated with main data, and "sub clip" refers to a clip associated with sub data.

Referring back to FIG. 2A, the playlist directory (PLAYLIST) includes one or more playlist files (*.mpls), wherein each playlist file (*.mpls) includes at least one play item specifying a play interval of a specific clip. More specifically, the PlayItem includes information specifying the presentation start and end times (In-Time and Out-time) of a specific clip, which may be specified by clip_Information_File_name in the PlayItem. Accordingly, a PlayList file (*.mpls) represents a reproduction management control file for reproducing (or playing back) a desired clip from a combination of one or more PlayItems.

Accordingly, FIG. 2B shows the relationship (or association) between the playlist file and the main clip. More specifically, the playlist file includes a main path with at least one play item, and each play item includes a reproduction (or playback) for reproducing (or playing back) a specific main clip (clip #1, clip #2, clip #3). or playback) management information. Therefore, when the PlayList of FIG. 2B is reproduced (or played back), AV stream #1 within Main Clip #1 is reproduced by PlayItem #1. Then, AV stream #2 within Main Clip #2 is subsequently reproduced by PlayItem #2, and AV stream #3 within Main Clip #3 is reproduced by PlayItem #3.

FIG. 3 shows a general structure of information (or data) associated with a file structure recorded on an optical disc according to the present invention. More specifically, starting from the inner circumference (or center) of the disc, the volume includes: a file system information area occupying the innermost portion of the volume, an AV stream area occupying the outermost portion of the volume, and a file system information area occupying the outermost portion of the volume. and the database area between the stream data area. System information for controlling the entire data file is recorded in the file system information area. In addition, main data such as audio/video/graphic data is recorded in the AV stream area. General files, playlist files and clip information files are recorded in the database area of the reel. More specifically, as described above, the data recorded in the AV stream area in the disc is called main data. Therefore, by using the information in the database area, the user can select the AV stream he wants to reproduce, and determine and use an appropriate reproduction method for the selected AV stream.

The present invention relates to a method for reproducing (or playing back) a recording combining main data recorded in an optical disc and sub-data existing in an external source. Hereinafter, various examples of the present invention will be described with reference to the accompanying drawings. Fig. 4 shows an optical recording and/or reproducing device 10 according to the invention. The optical recording and/or reproducing apparatus 10 basically includes: a pickup unit 11 for reproducing control information including main data and file information recorded on an optical disc; a servo 14 for controlling the operation of the pickup unit 11; a signal processor 13 for Used to restore the playback signal received from the pickup unit 11 to a desired signal value, or to modulate a signal to be recorded into a disc recordable signal and transmit the modulated signal; and a microcomputer 16 for controlling the above operations.

Furthermore, the controller 12 downloads sub data existing in an external source according to a user command, and stores the downloaded sub data in the local storage 15 . The controller 12 then creates a new combined playlist for reproducing the main data recorded in the optical disc and the sub data stored in the local storage 15 . Thereafter, according to a user command, the controller 12 reproduces the main data and the sub data by using the combined playlist. The AV decoder 17 performs final decoding of output data (ie, main data and/or sub data) according to the control of the controller 17, and provides the decoded data to the user. Furthermore, in order to record the signal in the optical disc, the AV encoder 18 converts the input signal into a specific format signal (eg, MPEG2 transport stream) according to the control of the controller 12 and supplies the converted signal to the signal processor 13 .

The local storage 15 storing sub data may also be configured as, for example, a hard disk drive (HDD). In addition, the newly created combined playlist can either be stored in the local storage 15 for future use, or can be temporarily stored in a separate dynamic storage and used. As an example of the present invention, the optical recording and/or reproducing apparatus alone creates a new combined playlist. In another example, when the sub data is downloaded and the downloaded sub data is stored, the combined playlist can also be downloaded and stored. In this case, the optical recording and/or reproducing apparatus 10 is not required to create another separate combined playlist.

Furthermore, if the user wants to store the sub-data and combined playlist in the local storage 15 for future use, it is preferable to give higher priority to using the playlist that manages only the main data recorded in the disc. The method for creating a combined playlist will be described in detail below with reference to FIGS. 6A to 7D .

Among the structures of the optical recording and/or reproducing apparatus 10 according to the present invention shown in FIG. 4, FIGS. 5A and 5B respectively show an apparatus for reproducing data and a method for reproducing data. More specifically, when an optical disc having a disc ID (disc_id) of #1—that is, disc_id=#1) is loaded, the controller 12 of the optical recording and/or reproducing apparatus 10 uses the pickup unit 11 and the signal processor 13 To verify the identity of the corresponding disk. Then, the controller 12 verifies whether a set of sub data associated with "disc_id=#1" exists among the sub data stored in the local storage 15 (S10).

For example, if there are first auxiliary audio stream (AuxAudiol), second auxiliary audio stream (Aux Audio2) and auxiliary rendering graphics stream (Aux PG) for “disc_id=#1” in the local storage 15, the controller 12 according to the user A request or system setting selects to reproduce (or play back) the stream (S20). In other words, the controller 12 may notify the user that the sub data exists, and then the controller 12 reproduces only the main data recorded in the disc or selects and reproduces a combined playlist including the sub data in the local storage according to a user command or a system setting. Therefore, when the user wishes to combine and reproduce the main data recorded in the optical disc and the sub data stored in the local storage 15, the controller 12 creates a reproduction management file such as a combined playlist file to manage the reproduction of the combined data, and uses The newly created reproduction management file reproduces data (S202).

Accordingly, the newly created combined playlist file is stored in the local storage 15, and it can be used again when the sub data is reproduced later. FIG. 5A shows an example of an assembled playlist file that has been stored in the local storage 15 to reproduce a text subtitle stream as subdata for "disc_id=#2". Therefore, when an optical disc whose disc ID is "disc_id=#2" is loaded into the optical recording and/or reproducing apparatus 10, the combined playlist already stored in the local storage 15 is used, and data reproduction can be performed immediately without creating New combo playlist. Additionally, as described above, composite playlists can also be downloaded and used. Preferred embodiments of the internal structure of the playback management file according to the present invention will be described in detail below with reference to FIGS. 6A to 9D.

The common features of all the embodiments for configuring reproduction management files (such as playlists) according to the present invention will be described below. File information for reproducing main data and sub data in combination is contained in the playlist file. Here, the main data is reproduced by at least one playitem included in the main path within the playlist file. In addition, sub data is reproduced by a sub play item included in a sub path within the play list file. In addition, the subplayitems for subdata included in the subpath are either associated with each playitem included in the main path (as shown in FIGS. 6A to 6E ), or are reproduced with the entire playlist within the main path. (or playback) sections are associated (as shown in FIGS. 9A to 9C ).

Furthermore, an auxiliary audio stream (AUX audio) or an auxiliary presentation graphics (PG) stream is suitable for use as sub-data in the present invention. More specifically, the auxiliary stream within the sub data may be configured in a language different from the main stream included in the main data. Alternatively, even if the sub data is configured in the same language as the main stream, the sub data may be configured to have different attributes. Such attributes may include different number of channels, different encoding types, etc. Furthermore, even if the auxiliary stream is configured in the same language as that of the main stream included in the main data, the content of the auxiliary stream may be configured in a different form. Therefore, in the description of the present invention, an auxiliary audio stream and an auxiliary presentation graphics stream will be exemplified as sub-data.

Finally, when configuring a combined playlist according to the invention, relevant information should be stored in the local storage 15 . More specifically, related information is prepared in advance by the disc author and downloaded together with the sub data. Accordingly, as shown in FIG. 5A, the "information" stored in the local storage 15 represents information used to configure the combined playlist.

FIGS. 6A to 6E and FIGS. 7A to 7D illustrate embodiments of subplayitems within a combined playlist associated with each playitem among methods of configuring a combined playlist. Therefore, FIGS. 6A to 6E show examples of configuring subplayitems among the method of configuring a combined playlist according to the present invention. Referring to FIG. 6A , when subplayitems in a subpath are configured, subplayitems matched by one-to-one correspondence with each playitem in a main path are independently configured.

More specifically, by specifying subplayitems corresponding to all playitems within the playlist at the same time, the secondary audio stream included in the subclips and specified by each corresponding subplayitem can be used instead of the Plays the primary audio stream specified by the item. This simplifies the system and facilitates the management of each play item. Therefore, when an optical disc is reproduced using the above combined playlist, video signals are reproduced from the main video stream recorded in the disc, and audio signals are reproduced from the auxiliary audio stream recorded in the local storage 15 . In other words, the primary audio stream recorded in the disc is replaced by the secondary audio stream stored in the local storage 15 .

Referring to FIG. 6B , when configuring the subplayitems in the subpath, the subplayitems that match each playitem in the main path one by one are configured independently. However, not all playitems have matching child playitems. In other words, by designating a subplayitem corresponding to a specific playitem within a playlist, only the main audio stream included in the main clip and specified by the specific playitem can be included in the subclips and specified by the corresponding subplayitem replaced by the auxiliary audio stream.

Therefore, when an optical disc is reproduced using the above combined playlist, video signals are reproduced from the main video stream recorded in the disc. And, when a subplayitem exists according to a subpath, an audio signal is reproduced from the auxiliary video stream recorded in the local storage 15 . However, when the subplayitem does not exist, the disc is reproduced from the main audio stream included in the main path and specified by the playitem. In other words, a part of the main audio stream in the disc is replaced by the auxiliary audio stream stored in the local storage 15 .

Referring to FIG. 6C , when configuring the subplayitems in the subpath, the subplayitems that match each playitem in the main path in a one-to-one correspondence are configured independently. However, there may be multiple matching subplayitems for one playitem. In other words, in FIGS. 6A and 6B, there is one matching subplayitem for each playitem. In contrast, in FIG. 6C, there are multiple matching subplayitems for one playitem. Here, FIG. 6C shows an example of only one PlayItem (PlayItem #1). However, it is obvious that this aspect of the present invention is equally applicable to other play items (play item #2, play item #3).

More specifically, by specifying a plurality of subplayitems corresponding to a particular playitem within a playlist, an auxiliary audio stream included in a plurality of subclips and specified by a corresponding plurality of subplayitems can be used instead of the secondary audio stream included in the main clip and specified by the playback The primary audio stream specified by the item. For example, reproduction may be performed by replacing the main audio signal reproduced by PlayItem #1 with two auxiliary audio signals having different attributes (eg, language) per part. Therefore, when an optical disc is reproduced using the above combined playlist, the video signal is reproduced from the main video stream recorded in the optical disc, and when there are subplay items according to the subpath, then from the auxiliary audio stream recorded in the local storage 15. Reproduces audio signals. However, when the SubPlayItem does not exist, an audio signal is reproduced from the Main Audio Stream included in the MainClip and specified by the PlayItem.

Referring to FIG. 6D , when configuring the subplayitems in the subpath, the subplayitems matching each playitem in the main path are configured independently. However, a subplayitem matching the playitem may exist only in a partial portion among the entire portion reproduced by the playitem. More specifically, in FIGS. 6A, 6B and 6C, one or more subplayitems partially match a complete playitem. However, in FIG. 6D, a subplayitem corresponding to one playitem exists only in one partial section. In other words, by specifying a subplayitem corresponding to a specific playitem included in a playlist only during a partial section, the entire section reproduced by the corresponding playitem includes: the main clip contained in the main clip and specified by the playitem The audio stream and the auxiliary audio stream contained in the subclip and specified by the subplayitem. For example, the main audio signal and the auxiliary audio signal having different attributes (for example, language) are reproduced only in a part of the entire part reproduced by PlayItem #1.

Therefore, when an optical disc is reproduced using the above combined playlist, the video signal is reproduced from the main video stream recorded in the disc, and the sub-audio stream recorded in the local storage 15 and specified by the sub-play item in the sub-path is reproduced by the specific play. A portion (or partial portion) of the entire presentation portion of the audio signal reproduced by the item. In this case, since the reproduction part (or presentation part) of the subplayitem in the subpath is not required to be the same as the playitem in the main path, the subplayitem can apply the auxiliary audio stream in a more diverse manner. However, in this case, a boundary between reproduction (or presentation) of the main clip and reproduction (or presentation) of the sub clip is generated. Here, the Main Clip is reproduced by a PlayItem (for example, PlayItem #1), and then the reproduction of the Main Clip becomes reproduction of the Sub Clip. At this point, the system needs to be supported to enable seamless rendering between audio streams even at boundaries.

Referring to FIG. 6E , when configuring the subplayitems in the subpath, the subplayitems matching each playitem in the main path are configured independently. However, each subplayitem is matched to its corresponding playitem by a different method. More specifically, in FIG. 6E, an example of configuring subplayitems as shown in FIGS. 6A to 6D is applicable to each playitem. For example, the method of replacing the entire part of PlayItem #1 with a subPlayItem (as shown in FIG. 6A or 6B), the method of replacing the entire part of PlayItem #2 with a plurality of SubPlayItems (as shown in FIG. The method in which a SubPlayItem replaces only a part of the entire part of PlayItem #3 is fully applied in FIG. 6E. Therefore, it is obvious that for each play item, the combined play list can be reproduced (or presented) according to the methods shown in FIGS. 6A to 6D .

7A to 7D show examples of configuring subpaths among the method of configuring a reproduction management file according to the present invention. Therefore, the method for configuring subplayitems in a subpath is applicable to any of the examples shown in FIGS. 6A to 6E . However, a new method for configuring subplayitems is shown in the case of FIG. 7D , which will be described in detail later.

Referring to FIG. 7A , when sub-paths are configured for sub-data, a sub-path is configured for each auxiliary data flow. For example, subpaths may be configured such that subpath #1 designates auxiliary audio stream #1, subpath #2 designates auxiliary audio stream #2, and subpath #3 designates auxiliary rendering graphics stream. Therefore, when the above combined playlist is reproduced, one of the subpath #1 and subpath #2 designating the same auxiliary stream file stored in the local storage 15 is selected and accompanied by the main data recorded in the disc and designated by the main path reproduce. Here, sub-path #3 designating an auxiliary presentation graphics stream may also be reproduced.

Referring to FIG. 7B , when sub-paths are configured for sub-data, a sub-path is configured for each auxiliary data stream attribute. For example, subpath #1 is configured to designate an auxiliary audio stream. Accordingly, the corresponding sub-path #1 specifies and manages all sub-data having auxiliary audio stream attributes stored in the local storage 15 and corresponding to the same disc. More specifically, auxiliary audio stream #1 is defined and managed as group #1, and auxiliary audio stream #2 is defined and managed as group #2. Similarly, subpath #2 is configured to designate a secondary rendering graphics (PG) stream. Accordingly, the corresponding subpath #2 designates and manages all subdata stored in the local storage 15 and corresponding to the same disc, having a secondary rendering graphics (PG) stream attribute. More specifically, auxiliary presentation graphics (PG) stream #1 is defined and managed as group #1, and auxiliary presentation graphics (PG) stream #2 is defined and managed as group #2. Therefore, when the above combined playlist is reproduced, subpath #1 and subpath #2 specifying subdata stored in the local storage 15 are each reproduced together with main data recorded in the disc and specified by the main path. However, when sub-path #1 and sub-path #2 are reproduced, one of group #1 and group #2 specified within each sub-path may be selectively reproduced.

Referring to FIG. 7C , when sub-paths are configured for sub-data, multiple auxiliary data streams may be configured in one sub-path. More specifically, one subpath is configured to reproduce subdata stored in the local storage 15, and a plurality of groups are formed for each auxiliary data stream within the corresponding subpath. For example, group #1 may be defined to be associated with auxiliary audio stream #1, group #2 to be associated with auxiliary audio stream #2, and group #3 to be associated with auxiliary presentation graphics (PG) stream. Therefore, when reproducing the above combined playlist, the sub path designating the sub data stored in the local storage 15 is reproduced together with the main data recorded in the disc and designated by the main path. However, when reproducing the sub-path, one of group #1, group #2, and group #3 may be selectively reproduced.

Referring to FIG. 7D , when sub-paths are configured for sub-data, multiple auxiliary data streams can be configured in one main path. Here, a combined subplayitem for reproducing subdata is created within the subpath. More specifically, a subpath is configured to reproduce subdata stored in the local storage 15, and a match is created within the corresponding subpath to each playitem (playitem #1, #2, #3) within the main path. The combined subplayitems of (combined subplayitems #1, #2, #3). Here, each composite subplayitem collectively manages at least one of auxiliary data streams to be reproduced with the corresponding playitem.

For example, Combo SubPlayItem #1 includes information for reproducing Sub Clip #1, Sub Clip #2, and Sub Clip #3. Here, sub clip #1, sub clip #2, and sub clip #3 reproduce auxiliary audio stream #1, auxiliary audio stream #2, and auxiliary presentation graphics (PG) stream stored in local storage 15, respectively. All of Sub Clip #1, Sub Clip #2, and Sub Clip #3 are simultaneously or selectively reproduced with the Main Clip specified by PlayItem #1. Although the method of configuring each of the combined sub-playitem #2 and the combined sub-playitem #3 is not shown in FIG. 7D, it is obvious that these combined sub-playitems can be configured by using the same method as the combined sub-playitem #1.

FIGS. 8A to 8C and FIGS. 9A to 9D illustrate an embodiment in which a subplayitem is associated with an entire part of a playitem in a method of configuring a combined playlist. Accordingly, FIGS. 8A to 8C show examples of configuring subplayitems among the method of configuring a combined playlist according to the present invention. Referring to FIG. 8A , when configuring subplayitems within a subpath, subplayitems matching an entire part of a playlist are independently configured. More specifically, by specifying subplayitems corresponding to all playitems within the playlist at the same time, the main audio stream included in the main clip and specified by each playitem is included in a subclip and specified by the corresponding A secondary audio stream specified by the subplayitem is replaced. The system can thus be simplified. Therefore, when an optical disc is reproduced using the above combined playlist, the video signal is reproduced from the main video stream recorded in the disc, and the audio signal is reproduced from the auxiliary audio stream recorded in the local storage 15 . In other words, the main audio stream recorded in the disc is replaced by an auxiliary audio stream recorded in the local storage 15 .

Referring to FIG. 8B , when configuring the subplayitems within the subpath, the subplayitems matching the entire part of the playlist are independently configured. Here, presentation sections are defined in time order within the SubPlayItem. More specifically, in the case of FIG. 8A, the SubPlayItem includes a start time (In-time) and an end time (Out-time). However, in the case of FIG. 8B, the SubPlayItem includes a plurality of start times and end times. Therefore, each section defined as a start time and an end time is called a "slot". For example, FIG. 8B shows three slots "Slot #1", "Slot #2" and "Slot #3" included in the SubPlayItem. A slot can be created starting from a random portion. However, the time slots may also match PlayItem #1, PlayItem #2, and PlayItem #3 within the main path.

Therefore, when an optical disc is reproduced using the combined playlist described above, video signals are reproduced from the main video stream recorded in the disc, and audio signals are reproduced from the auxiliary audio stream recorded in the local storage 15 . However, reproduction (or presentation) is performed according to the start time and end time specified by each slot #1, #2, and #3. In other words, the main audio stream recorded on the optical disc is replaced by the auxiliary audio stream stored in the local storage 15 .

Referring to FIG. 8C , when configuring the subplayitems within the subpath, only subplayitems matching a part of the entire playlist portion are individually configured. More specifically, a part of the entire main data presentation portion reproduced (or presented) by the playlist is replaced by sub data. For example, a part of the entire section reproduced by the combined playlist reproduces the main audio signal, and another part of the entire section reproduces the auxiliary audio signal. Therefore, when an optical disc is reproduced using the above combined playlist, video signals are reproduced from the main video stream recorded in the optical disc. When an audio signal is reproduced, a part of the entire portion of the audio signal reproduced by the combined playlist is reproduced from the main audio stream within the main path. In addition, another part of the audio signal is reproduced from the auxiliary audio stream recorded in the local storage 15 and specified by the subplayitem.

In this case, since the reproduction part (or presentation part) of the subplayitem in the subpath is not required to be the same as the playitem in the main path, the subplayitem can apply the auxiliary audio stream in a more diverse manner. However, in In this case, a boundary between reproduction (or presentation) of the main clip and reproduction (or presentation) of the sub clip is generated. Here, during reproduction of the main clip, the main clip is changed to reproduction of the sub clip. At this point, the system needs to be supported to enable seamless rendering between audio streams even at boundaries. Therefore, the time slots applied to FIG. 8B can be equally applied to FIG. 8C.

9A to 9D show examples of configuring subpaths among the method of configuring a reproduction management file according to the present invention. Correspondingly, the method for configuring subplayitems in a subpath can be applied to any of the examples shown in FIG. 8A to FIG. 8C . However, a new method of configuring subplayitems is shown in the case of FIG. 9D , which will be described in detail later. Therefore, the structure of the subpath is the same as that described in FIGS. 7A to 7D except for the structure of the subplayitems within the subpath.

Referring to FIG. 9A , when sub-paths are configured for sub-data, sub-paths are configured for each auxiliary data flow. For example, subpaths may be configured such that subpath #1 designates auxiliary audio stream #1, subpath #2 designates auxiliary audio stream #2, and subpath #3 designates auxiliary rendering graphics stream. Therefore, when the above combined playlist is reproduced, one of the subpath #1 and subpath #2 designating the same auxiliary stream file stored in the local storage 15 is selected and accompanied by the main data recorded in the disc and designated by the main path. reproduce. Here, sub-path #3 designating an auxiliary presentation graphics stream may also be reproduced.

Referring to FIG. 9B , when sub-paths are configured for sub-data, a sub-path is configured for each auxiliary data stream attribute. For example configure subpath #1 to specify an auxiliary audio stream. Accordingly, the corresponding subpath #1 specifies and manages all subdata having auxiliary audio stream attributes stored in the local storage 15 and corresponding to the same disc. More specifically, auxiliary audio stream #1 is defined and managed as group #1, and auxiliary audio stream #2 is defined and managed as group #2. Similarly, subpath #2 is configured to designate a secondary rendering graphics (PG) stream. Accordingly, the corresponding subpath #2 designates and manages all subdata stored in the local storage 15 and corresponding to the same disc, having a secondary rendering graphics (PG) stream attribute. More specifically, auxiliary presentation graphics (PG) stream #1 is defined and managed as group #1, and auxiliary presentation graphics (PG) stream #2 is defined and managed as group #2. Therefore, when reproducing the above combined playlist, each sub path #1 and sub path #2 designating the sub data stored in the local storage 15 is reproduced together with the main data recorded in the disc and designated by the main path. However, when sub-path #1 and sub-path #2 are reproduced, one of group #1 and group #2 specified within each sub-path may be selectively reproduced.

Referring to FIG. 9C , when sub-paths are configured for sub-data, multiple auxiliary data streams may be configured in one sub-path. More specifically, one subpath is configured to reproduce subdata stored in the local storage 15, and a plurality of groups are formed for each auxiliary data stream within the corresponding subpath. For example, group #1 may be defined to be associated with auxiliary audio stream #1, group #2 to be associated with auxiliary audio stream #2, and group #3 to be associated with auxiliary presentation graphics (PG) stream. Therefore, when reproducing the above combined playlist, the sub path designating the sub data stored in the local storage 15 is reproduced together with the main data recorded in the disc and designated by the main path. However, when reproducing the sub-path, one of group #1, group #2, and group #3 may be selectively reproduced.

Referring to FIG. 9D , when sub-paths are configured for sub-data, multiple auxiliary data streams may be configured in one sub-path. Here, a combined subplayitem for reproducing subdata is created within the subpath. More specifically, a sub-path is configured to reproduce sub-data stored in the local storage 15, and a combined sub-play item (combined sub-play item) corresponding to the reproduction time (or presentation time) in the main path is created in the corresponding sub-path. Item #1). The Composite SubPlayItem includes information for reproducing Sub Clip #1, Sub Clip #2, and Sub Clip #3. Here, each of sub clip #1, sub clip #2, and sub clip #3 reproduces auxiliary audio stream #1, auxiliary audio stream #2, and auxiliary presentation graphics (PG) stream stored in local storage 15, respectively. Sub Clip #1, Sub Clip #2, and Sub Clip #3 are simultaneously or selectively reproduced along with the Main Clip designated by the respective PlayItem #1, PlayItem #2, and PlayItem #3.

10A to 10F show the syntax of the combined playlist file for reproducing the sub data stored in the local storage 15 layer by layer. Fig. 10A shows the syntax of the header portion of the playlist file (xxxxx.mpls). Identification information identifying the current file as a playlist file, such as a "MPLS" character code, is recorded in the "type_indicator" field. Information indicating the version of the playlist file is recorded in a 'version_number' field. Position information indicating the start position of the "PlayList()" field is recorded in the "PlayList_start_address" field, and position information indicating the start position of the "PlayListMark()" field is recorded in the "PlayListMark_start_address" field. In addition, the playlist file (xxxxx.mpls) includes an "AppInfoPlayList()" field, a "PlayList()" field, and a "PlayListMark()" field. The "AppInfoPIayList()" field includes information on a reproduction (or playback) method (ie, PlayList_playback_type). The "PlayList()" field includes PlayItem information and SubPath information, and the "PlayListMark()" field includes a mark pointer for special reproduction (or playback). The following is a detailed description of the "PlayList()" field according to the present invention.

FIG. 10B shows the header syntax of the "PlayList()" field included in the PlayList file. Here, information on the size of the "PlayList()" field is recorded in the "length" field. Information on the number of PlayItems included in the PlayList file is recorded in a 'number_of_PlayItem' field, and information on the number of subpaths included in the PlayList file is recorded in a 'number_of_SubPaths' field. Accordingly, a "PlayItem( )" field and a "SubPath( )" field are created based on the above-mentioned number information. The 'PlayItem( )' field includes a 'STN_table( )' field in which there is all stream information that can be used in the corresponding PlayItem. When reproducing the 'PlayItem( )' field and the 'SubPath( )' field associated therewith, the optical recording and/or reproducing apparatus 10 may select and reproduce stream information defined in the 'STN_table( )' field. Therefore, all the above-mentioned stream information (as shown in FIGS. 6A to 9D ) are recorded in the "STN_table()" field.

Next, the syntax of the "STN_table()" field in the "PlayItem()" field will be described in detail with reference to Fig. 10C and Fig. 10E, and the syntax of the "SubPath()" field will be described in detail with reference to Fig. 10F. FIG. 10C shows the header syntax of the 'STN_table()' field included in the 'PlayItem()' field. More specifically, size information of the "STN_table( )" field is recorded in the "length" field. The number of reproducible video streams associated with the PlayItem is recorded in the "number_of_video_stream_entries" field, and the number of reproducible audio streams associated with the PlayItem is recorded in the "number_of_audio_stream_entries" field. The number of reproducible text subtitle streams associated with this PlayItem is recorded in the 'number_of_PG_textST_stream_entries' field. And finally, the number of reproducible interactive graphics streams associated with this PlayItem is recorded in the 'number_of_IG_stream_entries' field. Stream information is recorded based on the above-mentioned number information for each corresponding field. However, each stream information is recorded to a 'stream_entry( )' field and a 'stream_attributes( )' field, respectively. Here, a stream type, main clip information, and sub clip information are recorded in a 'stream_entry()' field, and attribute information of each stream is recorded in a 'stream_attribute()' field.

FIG. 10 shows the syntax of the 'stream_entry()' field included in the 'STN_table()' field. More specifically, size information of the 'stream_entry()' field is recorded in the 'length' field, and source information of the corresponding stream is recorded in the 'type' field. For example, Type "1" represents the stream type included in the Main Clip and specified by this PlayItem. Type "2" represents the stream type specified by the subpath and recorded in the disc. In addition, type “3” represents the flow type specified by the subpath and stored in the local storage 15 . Therefore, when the type of the current 'stream_entry()' field is '1', packet ID (PID) information of the corresponding main clip is recorded in the 'ref_to_stream_PID_of_mainclip' field. Also, when the type of the current 'stream_entry()' field is '2' or '3', packet ID (PID) information of the corresponding subclip is recorded in the 'ref_to_stream_PID_of_subclip' field. Obviously, when a plurality of subpaths are included, identification information of a corresponding subpath is recorded in a 'ref_to_SubPath_id' field, and identification information of a corresponding subclip is recorded in a 'ref_to_Subclip_entry_id' field.

FIG. 10E shows the syntax of the 'stream_attributes()' field included in the 'STN_table()' field. More specifically, the size information of the "stream_attributes( )" field is recorded in the "length" field, and the information of the stream type is recorded in the "stream_coding_type" field. For example, "stream_coding_type=0x02" represents a video stream (especially MPEG2 video stream), and attribute information is recorded in the "frame_rate" field. In addition, "stream_coding_type=0x80 or 0x81 or 0x82" represents audio streams encoded into various types. Here, the attribute information includes: "audio_presentation_type" in which the number of channels when the audio stream is reproduced (or presented) is recorded; and an "audio_language_code" field in which language information of the audio stream is recorded.

Also, "stream_coding_type=0x90" represents rendering graphics stream. The attribute information includes "PG_language_code" in which information of a language used in rendering graphics is recorded. And, "stream_coding_type=0x91" represents an interactive graphics stream. The attribute information includes "IG_language_code" in which information of a language used in an interactive graphic is recorded. Finally, "stream_coding_type=0x92" represents a text subtitle stream. The attribute information includes "textST_language_code" in which language information used in text subtitles is recorded, and a "character_code" field in which information of character codes used in text subtitles is recorded. Accordingly, only limited attribute information types of each stream are shown in FIG. 10E. However, it is obvious that a wider range of attribute information can be included in each stream type.

FIG. 10F shows the header syntax of the "SubPath()" field included in the "PlayList()" field. More specifically, the size information of the "SubPath()" field is recorded in the "length" field, the stream type information is recorded in the "stream_coding_type" field, and the source information of the corresponding subpath is recorded in the "SubPath_type" field . For example, SubPath_type “n” represents a subpath recorded in an optical disc, and SubPath_type “m” represents a subpath stored in the local storage 15 .

According to this embodiment, multiple sub-paths may be configured for each flow attribute (for example, as shown in FIGS. 7A, 7B, 9A and 9B). In this case, the subpath type is described more fully. More specifically, SubPath_type "n1" or "m1" may represent an audio stream, SubPah_type "n2" or "m2" may represent a text subtitle stream, Subpath_type "n3" or "m3" may represent an interactive graphics stream, and SubPath_type "n4 " or "m4" can represent the rendering graphics stream. In addition, flag information indicating whether subpath presentation is to be repeated is recorded in the 'is_repeat_Subpath' field. The number of SubPlayItems included in the SubPath is recorded in a 'number_of_SubPlayItems' field. Information corresponding to each SubPlayItem is recorded in the 'SubPlayItem()' field.

FIG. 10G shows the syntax of the "SubPlayItem()" field included in the "SubPath()" field. More specifically, the size information of the "SubPlayItem()" field is recorded in the "length" field, the name of the sub clip stored in the local storage 15 and managed by the corresponding subplay item is recorded in the "Clip_information_file_name" field, And the STC_id within the designated Sub Clip is recorded in the "ref_to_STC_id" field. In addition, the presentation start time (IN_time) and presentation end time (OUT_time) performed by the corresponding SubPlayItem are recorded in the "SubPlayItem_IN_time (1, 2, ..., k)" field and the "SubPlayItem_OUT_time (1, 2, ..., k)" field, respectively. ..., k)" field. If the SubPlayItem includes more than one "Time_slot" as shown in FIG. 8B, each "Time_slot" requires a presentation start time (IN_time) and a presentation end time (OUT_time). Therefore, a plurality of 'SubPlayItem_IN_time' fields and 'SubPlayItem_OUT_time' fields should be contained in the 'SubPlayItem()' field. Also, play item identification information (for example, play item #1, play item #2, play item #3) associated with the presentation start of the sub play item is recorded in the "sync_PlayItem_id" field. Information associated with a presentation start time of a SubPlayItem is recorded in a 'sync_start_PTS_of_PlayItem' field. More specifically, when the presentation of the PlayItem reaches a specific time specified by the identification information recorded in the 'sync_PlayItem_id' field, information to start presenting the SubPlayItem is recorded in the 'sync_start_PTS_of_PlayItem' field. In other words, since the information of the 'sync_PlayItem_id' field associated with the PlayItem and the information of the 'sync_start_PTS_of_PlayItem' field associated with the PlayItem are synchronized, the PlayItem and the subPlayItem may match each other.

Industrial Applicability

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention cover the modifications and variations of this invention that come within the scope of the appended claims and their equivalents.

Claims (42)

1. A method of reproducing data recorded on a recording medium, the method comprising: The main data recorded on the recording medium and the sub data stored in the local storage are reproduced using a playlist file including a main path and a sub path, wherein the main path contains a play for playing back the main data. item, and the subpath includes at least one subplayitem associated with the playitem for playback of the subdata in association with playback of the main data. 2. The method of claim 1, wherein the subpath comprises a single subplayitem associated with the playitem. 3. The method according to claim 2, wherein the playing interval of the sub-play item is consistent with the entire part of the playing interval of the play item. 4. The method according to claim 2, wherein the playing interval of the sub-play item is consistent with the selected part of the playing interval of the play item. 5. The method of claim 4, wherein the sub-clips assigned to the selected portion and the main clip assigned to the remainder of the playback interval of the play item are presented seamlessly. 6. The method of claim 1, wherein the subpath comprises a plurality of subplayitems associated with the playitem. 7. The method of claim 6, wherein the plurality of subplayitems are divided into at least one group based on characteristics of subdata stored in the local storage. 8. The method according to claim 6, wherein the playing interval of at least one of the multiple sub-play items is consistent with the entire part of the playing interval of the play item. 9. The method according to claim 6, wherein the playing interval of at least one of the plurality of sub-play items is consistent with the selected part of the playing interval of the play item. 10. The method of claim 9, wherein the sub-clips assigned to the selected portion and the main clip assigned to the remainder of the play item's playing interval are presented seamlessly. 11. The method of claim 1, wherein at least one subplayitem contained in the subpath is synchronized with the playitem. 12. The method of claim 1, wherein the sub-data stored in the local storage includes additional audio data. 13. The method of claim 12, wherein the play item is further configured to play back original audio data recorded on the recording medium, and the additional audio data replaces the original audio data. 14. The method of claim 12 , wherein the play item is further configured to playback original audio data recorded on the recording medium, and the additional audio data is attached to the original audio data . 15. The method of claim 1, wherein the sub-data stored in the local storage comprises rendering graphics data. 16. The method according to claim 1, wherein the playlist file further comprises sub-path type information identifying the type of the sub-path. 17. The method of claim 1, wherein the playlist file further includes stream type information that distinguishes the main data and the sub data from each other. 18. A method of reproducing data recorded on a recording medium, the method comprising: Main data recorded on the recording medium and associated sub data stored in the local storage are reproduced using a playlist file comprising a main path and a sub path, wherein the main path contains information for playback of the main data a plurality of playitems, and the subpath includes at least one subplayitem associated with the playitem for playing back the subdata in association with playback of the main data. 19. The method of claim 18, wherein the subpath comprises a single subplayitem associated with the plurality of playitems. 20. The method according to claim 18, characterized in that, the playing interval of the sub-play item is consistent with the entire part of the combined playing interval of the plurality of play items. 21. The method according to claim 19, wherein the playing interval of the sub-play item is consistent with the selected part of the combined playing interval of the plurality of play items. 22. The method of claim 18, wherein the subpath comprises a plurality of subplayitems each associated with the plurality of playitems. 23. The method of claim 22, wherein the plurality of subplayitems are divided into at least one group based on characteristics of the subdata. 24. The method according to claim 22, wherein the playing interval of at least one of the plurality of sub-play items is consistent with a selected part of the combined playing interval of the play item. 25. The method according to claim 22, characterized in that, the playing interval of at least one of the plurality of sub-play items is consistent with the entire part of the combined playing interval of the play item. 26. The method according to claim 18, wherein the playlist file further comprises sub-path type information identifying the type of the sub-path. 27. The method of claim 18, wherein the playlist file further includes stream type information that distinguishes the main data and the sub data from each other. 28. A method of reproducing data recorded on a recording medium, the method comprising: The main data recorded on the recording medium and the sub data stored in the local storage are reproduced using a playlist file including a main path and a plurality of sub paths, wherein the main path includes a play for playing back the main data. items, and each subpath includes at least one subplayitem associated with the playitem for playing back the subdata in association with playback of the main data. 29. The method of claim 28, wherein at least one of the subpaths contains a single subplayitem associated with the playitem. 30. The method according to claim 29, wherein the playing interval of the single sub-play item coincides with the entire part of the playing interval of the play item. 31. The method of claim 29, wherein the playing interval of the single subplayitem coincides with a selected portion of the playing interval of the playitem. 32. The method of claim 28, wherein at least one of the subpaths includes a plurality of subplayitems associated with the playitem. 33. The method of claim 32, wherein the plurality of subplayitems are divided into at least one group based on characteristics of the subdata stored in the local storage. 34. The method according to claim 32, wherein the playing interval of at least one of the plurality of sub-play items coincides with a selected part of the playing interval of the play item. 35. The method according to claim 32, wherein the playing interval of at least one of the plurality of sub-play items is consistent with the entire part of the playing interval of the play item. 36. The method of claim 28, wherein the playlist file further includes subpath type information identifying a type of each subpath. 37. The method of claim 28, wherein the playlist file further includes stream type information that distinguishes the main data and the sub data from each other. 38. An apparatus for reproducing data recorded on a recording medium, the apparatus comprising: a pickup unit for reading the main data recorded on the recording medium; Local storage for storing sub-data associated with said main data; a decoder for decoding the main data and the sub data using a playlist file including a main path and a sub path, wherein the main path contains a play item for playing back the main data, and the sub path A path contains at least one subplayitem associated with the playitem for playback of the subdata in association with playback of the main data. 39. The apparatus of claim 38, wherein the playlist file is stored in the local storage. 40. The apparatus of claim 38, wherein the playlist file is recorded on the recording medium. 41. An apparatus for reproducing data recorded on a recording medium, the apparatus comprising: a pickup unit for reading the main data recorded on the recording medium; local storage for storing sub-data associated with said master data; and a decoder for decoding the main data and the sub data using a playlist file including a main path and a sub path, wherein the main path contains a plurality of playitems for playing back the main data, and The subpath includes at least one subplayitem associated with the playitem for playback of the subdata in association with playback of the main data. 42. An apparatus for reproducing data recorded on a recording medium, the apparatus comprising: a pickup unit for reading the main data recorded on the recording medium; local storage for storing sub-data associated with said master data; and a decoder for decoding the main data and the sub data using a playlist file including a main path and a plurality of sub paths, wherein the main path contains a play item for playing back the main data, and each A subpath contains at least one subplayitem associated with the playitem for playback of the subdata in association with playback of the main data.

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