KR20010054092A - Data recording medium recorded navigation data - Google Patents

Abstract

PURPOSE: A data recording medium is provided to perform random access of data rows distributed in plural files. CONSTITUTION: A navigation data is supplied to control recording, reproducing, and editing of a bit stream. Herein, the navigation data is called as an SRI(Stream Recorder Information) in recording the bit stream. The SRI is formed by an SMIT(Stream Management Information Table), an SFIT(Stream File Information Table), an ORG_PGCIT(Original PGC Information Table), and an EIMT(Extended Information Management Table). Herein, the information tables are stored in a stream recording information file and a stream recording information backup file. Herein, the backup file is stored in an opposite recording area from the stream recording information file.

Description

Data recording medium on which navigation data is recorded {DATA RECORDING MEDIUM RECORDED NAVIGATION DATA}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium of a digital stream data recording apparatus. In particular, navigation data necessary for random access to each data string is recorded when a plurality of data strings are scattered in multiple files or a plurality of data strings exist in the same file. To a recorded data recording medium.

The hard disk drive, which is a secondary memory device of a computer system, can be randomly accessed. The digital stream, an AV device, has a high data transfer speed and can be cheaper and larger in capacity than other auxiliary memory devices. It is used as a random access storage device of a data recording device.

An HDD-type broadcast receiving system, which is an example of a digital stream data recording apparatus, is a system capable of recording and playing back a broadcast video stream and simultaneously viewing time delay. In such a broadcast receiving system, respective data strings for reserved recording and time delay viewing are input and recorded in a recording medium. In this case, a plurality of data strings (data strings for time-delay viewing, data streams for reservation recording, etc.) form a respective file or have a structure in which they are continuously arranged in one file.

If a plurality of data strings having the same attribute are scattered in a plurality of files or a plurality of data strings having different attributes are present in one file, navigation information for random access to each data string is required. In addition, the above-described broadcast reception system does not have a structure in which one type of data string exists in a single file like a PC, but may have multiple types of data strings (text format and JAVA format) in one file. You also need information to identify the type or format of the data column.

Accordingly, an object of the present invention is to provide a data recording medium on which navigation data is recorded which can randomly access each data string interspersed in a plurality of files.

Still another object of the present invention is to provide a data recording medium on which navigation data for randomly accessing each data string is recorded even when a plurality of data strings exist in one file.

Still another object of the present invention is to provide a data recording medium on which navigation data having attribute information for distinguishing the type or format of each data string recorded in a file is recorded.

The present invention for achieving the above object is composed of information for controlling the recording, reproduction and editing of the bit stream, and the stream file information table including at least the attribute information of the application packet to be recorded and the first disc packet position information of the AV data. and;

An original program chain information table composed of data structure information about a program chain generated at the time of recording a bit stream;

Navigation data including a start address of the stream file information table, an end address information of the navigation data, a start address information of the original program chain information table, and an end address information of its own are recorded. It is characterized by.

1 is a block diagram of a broadcast receiving system as an example of a digital stream data recording apparatus according to an embodiment of the present invention;

2 is a structural diagram of navigation data according to an embodiment of the present invention;

3 is a structure diagram of a stream management information table (SMIT) in FIG. 2;

4 is a structure diagram of a stream file information table (SFIT) in FIG. 2;

FIG. 5 is a structure diagram of stream file information (SFI) in FIG. 4; FIG.

6 is a structure diagram of AV data information (AVDT) in FIG. 5;

FIG. 7 is a time map (TMAP) structure diagram of FIG. 6. FIG.

8 is a structure diagram of a reference picture map (RPMAP) in FIG. 6.

9 is an original PGC information table structure diagram of FIG.

10 is a clip information structure diagram of FIG. 9;

FIG. 11 is a structure diagram of an extended information management table in FIG. 2; FIG.

Hereinafter, a structure of navigation data according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a part of a broadcast reception system employing a data recording medium according to an embodiment of the present invention.

Referring to FIG. 1, first, a broadcast receiving system according to an embodiment of the present invention includes a broadcast signal receiver 400, a buffer and time stamp inserter 410, a buffer and timing playback unit 420, and a main control unit (MCU). ) 430, the HDD 440, and the physical layer connection unit 450.

The broadcast signal receiver 400 may include an RF tuner for receiving a digital broadcast signal input from the outside, a plurality of RF tuners for receiving an analog broadcast signal input from the outside, and an analog signal input through the plurality of RF tuners. It consists of a plurality of data compressors that convert digital signals and compress them into multimedia files (AV files). The physical layer connection unit 460 receives and outputs a multimedia file from an external network such as an IEEE 1394 network.

The buffer and time stamp inserter 410 controls the buffering of the multimedia file input from the broadcast signal receiver 400 and the physical layer connection unit 450, and at the 27 MHz clock when a source packet constituting the multimedia file arrives. It captures the incremental internal counter value and inserts it into the input source packet to output it.

The MCU 430 controls the overall operation of the broadcast receiving system according to the embodiment of the present invention. For example, a series of source packets output from the buffer and time stamp inserting unit 410 are disk-packed, recorded and stored in the file recording area of the HDD 440, and the editing and reproduction operations of the recorded stream are controlled. On the other hand, the buffer and timing reproducing unit 420 temporarily stores the AV stream played by the HDD 440, and reads the time-stamped source packet from the buffer and then removes the time stamp when the time is written in the time stamp. Output the source packet to an A / V decoder (not shown).

Hereinafter, the structure of the navigation data required for random access to each data string recorded on the data recording medium (hard disk) of the above-described broadcast receiving system will be described.

Before describing the structure of the navigation data, the terms used below are briefly defined. First, a program chain (PGC) corresponds to a program set and is a conceptual unit representing connection of programs. The program set refers to all contents recorded on a hard disk, and a program is a logical unit recognized and defined by a user. Each program consists of one or more clips. The clip is a data structure representing a part of the program. In an original PGC (representing a program set), a program consists of one or more clips. Meanwhile, AV data refers to stream data generated by recording broadcast data once and continuously. A disk packet is composed of source packets recorded as a basic unit of AV data, which becomes a basic unit of editing and random access. The source packet is a packet added with an Arrival Time Stamp (ATS) to a packet received in a broadcast.

Meanwhile, the STR_REC.AVT / STR_REC.AVR file is a file that stores a program belonging to the original PGC. The STR_REC.AVT file is used for time delay viewing, and will be defined as a time delay viewing file below. The AVR file will be defined as a schedule recording or recording file.

Time Map (TMAP) is a table that associates the location of the disk packet with the ATS of the stored source packet. TMAP has a time list and a size in sector list. Program Chain Information (PGCI) is a data structure representing information related to a PGC such as a playback order of a program, and the program playback order follows the order of clips defined in the PGCI. AV Data Information (AVDTI) is a data structure representing information about AV data.

Referring to navigation data, navigation data is data provided for controlling recording, reproduction, and editing of a bit stream. In bit stream recording, the navigation data is referred to as "stream recorder information (SRI)". Such stream recorder information (SRI) is referred to as "Stream Management Information Table (SMIT)", "Stream File Information Table (SFIT)", "Original PGC information table as shown in FIG. (Original PGC Information Table: ORG_PGCIT) "and" Extended Information Management Table (EIMT) ". The extended information management table (EIMT) is an auxiliary data area for future upgrade. The four information tables described above are recorded in the form of an original and a copy in the stream record information file STR_REC.IFO and the stream record information backup file STR_REC.BAK, respectively. The stream record information file STR_REC.IFO is a file in which navigation data such as a program set, a program, and an entry point exists. The stream record information backup file STR_REC.BAK is a file containing the stream record information file ( STR_REC.IFO) backup file. Such a backup file is preferably recorded in a recording area opposite to the position where the stream recording information file (STR_REC.IFO) is recorded. The reason for this is that assuming that a scratch occurs on the hard disk surface, the scratch appears to have a constant length in the transverse or longitudinal direction on the disk surface.

Hereinafter, the information constituting the above-described navigation data (stream recorder information) will be described. FIG. 3 illustrates a structure of a stream management information table (SMIT) in FIG. 2. As shown in FIG. 3, the stream management information table SMIT includes one " Stream Management Information Table Information SMITI. &Quot; The stream management information table information SMITI is shown in Table 1 below. It is composed as follows.

SMITI Contents Number of bytes SRI_EA End Address of SRI 4 SMIT_EA End Address of SMIT 4 VERN Version Number of Stream Recording Specification 2 TM_ZONE Time zone 2 CHRS Character set code for text 2 SFIT_SA Start Address of SFIT 4 ORG_PGCIT_SA Start Address of ORG_PGCIT 4 EIMT_SA Start Address of EIMT 4

For reference, in Table 1, SRI_EA represents an end address as a RLBN (Relative Logical Block Number) based on the first logic block (LB) of the stream recorder information (SRI). SMIT_EA represents the end address of the stream management information table (SMIT) as a relative byte number (RBN) based on the first byte of the SMIT, and the format of TM_Zone follows the Time Zone Describing format of the DVD-VR.

Hereinafter, another configuration information of the stream recorder information SRI will be described. FIG. 4 shows a structure diagram of the stream file information table SFIT in FIG. The stream file information table (SFIT) includes only navigation data directly related to the operation of the stream recorder. As shown in FIG. 4, the stream file information table SFIT includes one piece of "Stream File Information Table Information (SFITI)", zero or a plurality of pieces of "AV Data Stream Information (AVDT_STI). ) ", Zero, or one" Stream File Information (SFI) ".

The "stream file information table information (SFITI)" is composed of the number of AV data stream information existing after the SFITI and the end address of the SFIT as shown in Table 2 below.

SFITI Contents Number of bytes AVDT_STI_Ns Number of AVDT_STI 2 SFIT_EA End Address of SFIT 4

On the other hand, the AV data stream information AVDT_STI is composed of an attribute of an application packet, an application packet size, and a time stamp size as shown in Table 3 below.

AVDT_STI Contents Number of bytes AP_ATR Attribute of Application Packet 4 AP_SZ Size of Application Packet 2 ATS_SZ Size of ATS 2

In Table 3, the attribute of the application packet (AP_ATR) is the information corresponding to the various applications to distinguish the MPEG-format data stream, non-MPEG format data stream (ie, AVI format, text format, Java format, etc.) Used as information for

Referring to the configuration of the stream file information (SFI) constituting the stream file information table (SFIT) shown in FIG. 4, first, FIG. 5 shows a structure diagram of the stream file information (SFI) in FIG. The information SFI includes one "Stream File General Information (SF_GI)", zero or a plurality of "AV Data Information Search Pointer (AVDTI_SRP)", and the same number of "AV data." Information (AV Data Information: AVDTI). The stream file general information SF_GI indicates the number of AV data information AVDTI, and the AV data information search pointer AVDTI_SRP uses the start address of the AV data information AVDTI as an RBN based on the first byte of SFI. It is shown as.

FIG. 6 is a diagram illustrating the structure of AV data information AVDTI in FIG. 5, wherein the AV data information AVDTI includes one piece of "AV data information general information" as shown in FIG. 6. AVDTI_GI) ", one" Time Map (TMAP) ", and an optional" Reference Picture Map (RPMAP) ". Among them, the AV data general information information AVDTI_GI includes information as shown in Table 4 below.

AVDTI_GI Contents Number of bytes AVDT_TY AV data type One AVDT_REC_TM Recording time of AV data 5 AVDT_STI_N AV data stream information number One AVDT_S_ATS AV data start ATS 6 AVDT_E_ATS AV Data End ATS 6 AVDT_FDP_LOC AV data first disc packet position 6 TMAP_ENT_Ns TMAP Entry Count 4 RPMAP_ENT_Ns RPMAP entry count 4

In Table 4, AVDT_TY indicates a type of related AV data. The least significant bit is a continuity flag information bit and indicates whether it is continuity with previous AV data, and the second least significant bit indicates whether temporary AV data is temporarily deleted and Used to indicate steady state. In Table 4, AVDT_STI_N represents the index of AVDT_STI corresponding to the relevant AV data, and AVDT_S_ATS is the full precision of the arrival time of the first AP among the APs forming the AV data. In addition, AVDT_E_ATS also represents the arrival time of the first AP among the APs forming the AV data in full resolution. On the other hand, AVDT_FDP_LOC represents the position of the first disk packet (based on the first logical block of the file (STR_REC. ###) that stores related AV data) of the disk packets constituting the AV data in RLBN.

FIG. 7 illustrates a structure of a time map (TMAP) in FIG. 6. The time map TMAP is composed of a plurality of time map entries TMAP_ENT #, and each time map entry TMAP_ENT # has ATS information DP_FATS of the first source packet among the source packets recorded in the disk packet DP. And disk packet size (DP_SZ) information. The size of the disk packet is expressed in sector units.

FIG. 8 is a diagram illustrating a structure of a reference picture map (RPMAP) in FIG. 6, which is composed of a plurality of reference picture map entries (RPMAP_ENT #), and each reference picture map entry (RPMAP_ENT) is shown in Table 5 below. Contains the same information.

RPMAP_ENT Contents Number of bytes DP_N Disk Packet Number 4 SRC_PKT_N Source Packet Number 4 SRC_PKT_Ns Number of Source Packets constituing a Ref.Picture 4

In Table 5, DP_N represents the number of the disk packet to which the reference picture belongs, and SRC_PKT_N represents the number of the source packet including the first part of the reference picture in the disk packet. SRC_PKT_Ns represents the size of the reference picture in units of source packets and represents the number of source packets constituting the reference picture.

FIG. 9 illustrates a structure diagram of an original PGC information table (ORG_PGCIT) in FIG. 2. The original PGC is a data structure for a program chain generated when recording broadcast data, and has a structure as shown in FIG. The original PGC information table (ORG_PGCIT) includes one "Program Chain General Information (PGC_GI)", one or more "Program Information (PGI)", one or more "Clip Information Search Pointers". (Clip Information Search Pointer: CI_SRP) "and" Clip Information (CI) "equal to the CI_SRP.

The program chain general information PGC_GI includes information PG_Ns indicating the number of programs existing in the PGC, and information indicating the number of clip information search pointers present in PGCI (CI_SRP_Ns, equal to the number of clip information). . The program information PGI includes information as shown in Table 6 below, and the clip information search pointer CI_SRP expresses the start address of the clip information CI as an RBN based on the first byte of the PGCI (Start Address). of CI: CI_SA).

PGI Contents Number of bytes PG_TY Program Type 4 C_Ns Number of Clips in this Program Title Title of Program PRG_CREATE_TM Create Time of this Program Bookmark BookMark for restart FileName File name associated with Program SourceName Channel Source Name Copy Protection Story line Content Category Audience rating PSI Information MaxBps MaxBps

In Table 6, BookMark is information indicating a previously viewed position so that only a part of the recorded program can be viewed, and then only the rest of the recorded program can be viewed. The file name indicates a file name where the program is stored. The least significant bit of PG_TY is a protect flag and is used as an information bit indicating whether a program is protected. On the other hand, in Table 6, C_Ns represents the number of clips belonging to the program (PG). For all programs and clips in the PGC, the programs and the clips connected thereto are arranged in ascending order. That is, if PG # 1.C_Ns = 1 and PG # 2.C_Ns = 2, the first CI is connected to PG # 1, and the second and third CIs are connected to PG # 2.

FIG. 10 illustrates a structure diagram of clip information CI in FIG. 9, wherein the clip information CI includes clip general information (C_GI) and clip entry point information (C_EPI). do. In this case, the clip general information (C_GI) is a clip type (C_TY), the AV data number (AVDT_N) associated with the clip, the number of entry point information (C_EPI) belonging to the clip information (C_EPI_Ns), the arrival of the first AP in the clip Information C_S_ATS indicating time, and information C_E_ATS indicating arrival time of the last AP in the clip.

FIG. 11 illustrates an extended information management table (EIMT) structure diagram of FIG. 2, which includes extended information management table information (EIMTI), extended information search pointer (EI_SRP), and extended information. It consists of information (Extended Information: EI). The extended information management table information EIMTI includes information on the number of EI_SRPs present in the EIMTI and information indicating an end address of the extended information management table (EIMT) in RBNs based on the first byte of the EIMT. The extended information search pointer EI_SRP includes information indicating the start address of the extended information EI in RBN based on the first byte of the EIMT. Finally, the extended information EI is data corresponding to the content of the extended information and has a variable length.

As described above, the present invention records the attribute information (AP_ATR) of the application packet in the AV data stream information (AVDT_STI) constituting the stream file information table (SFIT). Navigation data is configured to respond appropriately by explicitly providing such attribute information.

Furthermore, in the AV data information general information (AVDTI_GI) of the stream file information (SFI) constituting the stream file information table (SFIT), the disc constituting the AV data based on the first logic block of the file which stores the relevant AV data. By recording the information (AVDT_FDP_LOC) indicating the first position of the packet, even if multiple data strings are scattered in one file, the first disk packet position of the data string to be accessed can be read based on the first logical block of the file. The data column can be randomly accessed. Of course, even if the data strings having the same attribute are scattered among the various files, since the first disk packet position information AVDT_FDP_LOC of the data string is associated with the file as described above, the data string may be randomly accessed.

On the other hand, terms used herein are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a person skilled in the art and the definitions should be made based on the contents throughout the present application. .

In addition, although specific embodiments of the present invention have been described and illustrated, it is obvious that the present invention can be variously modified by those skilled in the art. And since the present invention has been described in the present invention through a preferred embodiment of the present invention, when considering the technical difficulty aspects of the present invention, those skilled in the art can easily be modified to another embodiment and other embodiments of the present invention As can be added, it will be apparent that all embodiments and modifications cited in the above description belong to the appended claims.

As described above, the present invention includes attribute information such as a file type and type, a file name as information for identifying a file, and first data location information from a file storing a related data string in an application packet received in the navigation data. This provides the advantage of explicitly providing the user with attributes such as the type / type of the data column prior to interpretation of the data column, and allows random access to the data column even when multiple data columns are scattered in one file. There is an advantage.

Claims (13)

A data recording medium on which navigation data is recorded, A stream file information table comprising information for controlling the recording, reproducing, and editing of the bit stream, and including at least attribute information of the application packet to be recorded and first disc packet position information of the AV data; An original program chain information table composed of data structure information about a program chain generated at the time of recording a bit stream; Navigation data including a start address of the stream file information table, an end address information of the navigation data, a start address information of the original program chain information table, and an end address information of its own are recorded. Data recording medium, characterized in that. The data recording medium of claim 1, further comprising: an extended information management table for later upgrade, and navigation data in which a start address is additionally recorded in the stream management information table is recorded. 3. The system of claim 1 or 2, wherein the stream file information table; Stream file information table information consisting of the number of AV data stream information existing thereafter and an end address of the stream file information table; AV data stream information consisting of attribute information and a size of the application packet and a size of a time stamp; A data recording medium comprising stream file information. 4. The data recording medium of claim 3, wherein the end address of the stream file information table is recorded in a relative number of bytes based on the first byte of the stream file information table. 4. The apparatus of claim 3, wherein the stream file information comprises: Stream file general information indicating the number of AV data information; AV data information search pointers indicating a start address of each AV data information; A data recording medium comprising: AV data information. 6. The data recording medium of claim 5, wherein the start address of the AV data information is recorded in a relative number of bytes based on the first byte of the stream file information. The method of claim 5, wherein the AV data information; The type of the AV data, the recording time of the AV data, the index of the AV data stream corresponding to the relevant AV data, the arrival time of each of the first and last application packets forming the AV data, and the disk packet constituting the AV data. AV data information general information including the position information of the first disk packet and the number of entries of the time map and the number of entries of the reference picture map; A time map composed of a plurality of time map entries comprising arrival time stamp information of a first source packet of the source packets constituting the disk packet and a disk packet size; It consists of a number of reference picture map entries comprising a number of a disk packet to which a reference picture belongs, a number of a source packet including a first portion of a reference picture in the disk packet, and a number of source packets constituting the reference picture. And a reference picture map. 8. The data record as claimed in claim 7, wherein the position information of the first disk packet among the disk packets constituting the AV data is recorded in a relative logic block number on the basis of the first logic block of the file storing the relevant AV data. media. The method according to claim 1 or 2, wherein the original program chain information table; Program chain general information comprising a number of programs existing in the program chain, and a number of clip information search pointers present in the program chain information; A number including at least the type of the program, the number of clips of the program, the program title, the program creation time, a bookmark showing the previously viewed location as time information, the file name where the program is stored, and the source name. Program information, Clip information search pointers which are starting addresses of respective clip information, A data recording medium comprising clip information. 10. The data recording medium of claim 9, wherein the least significant bit of the program type is used as a protection flag bit of the program. 10. The data recording medium of claim 9, wherein the start address of the clip information is recorded in a relative byte number based on the first byte of the program chain information. 10. The method of claim 9, wherein the clip information; Clip general information consisting of the clip type, the AV data number associated with the clip, the number of entry point information belonging to the clip information, the arrival times of the first and last application packets in the clip, A data recording medium comprising a plurality of clip entry point information indicating the arrival time of each entry point. The method of claim 2, wherein the extended management information table; Extended information management table information consisting of the number of extended information and the end address of the extended information management table; Extension information search pointers indicating a start address of each extension information; And a data recording medium comprising extension information consisting of data of extension information.