KR100677099B1 - Recording medium recorded contents stream data thereon, recording apparatus, and reproducing apparatus therefor - Google Patents

Abstract

The present invention relates to a recording medium on which content stream data is recorded, a recording apparatus thereof, and a playback apparatus.

According to the present invention, in a recording medium recorded as a stream object in which at least one recording unit having a predetermined size of content stream data is collected, the recording unit includes one or more stream packs, and the stream packs have a playback time. And an application packet packed with an application time stamp and information stream data indicating information, and each of the recording units except for the last recording unit includes at least two application time stamps. As a result, the IAPAT value can be properly obtained for all SOBUs, so that the program search made with reference to the mapping list can be performed smoothly without error.

Description

Recording medium on which content stream data is recorded, its recording apparatus, and playback apparatus {Recording medium recorded contents stream data thereon, recording apparatus, and reproducing apparatus therefor}

1 is a data structure diagram of a conventional program.

2 illustrates a case where no ATS exists in the SOBU.

3 illustrates a conventional countermeasure when there is no ATS in the last SOBU.

4 is a data structure diagram according to a first embodiment of the present invention.

5 is a data structure diagram according to a second embodiment of the present invention.

6 is a block diagram of a recording apparatus according to a preferred embodiment of the present invention.

7 is a block diagram of a playback apparatus according to a preferred embodiment of the present invention.

8 is a block diagram of a recording / playback apparatus according to a preferred embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of recording and reproducing content stream data, and more particularly, to a recording medium on which content stream data is recorded, a recording apparatus, and a reproduction device.

Various contents shown to the user such as movies, music, etc. are commonly referred to as "programs".

1 is a data structure diagram of a conventional program.
In general, the content stream data constituting the program is formed of one stream object (SOB: Stream OBject). Referring to FIG. 1, an SOB is composed of a chain in which one or more Stream Object Units (SOBUs) are connected. The SOBU is a unit of recording / editing data and has a constant data size. However, since the input speed / output speed of the data stream constituting the program may vary with time when data is recorded / reproduced, the length of the SOBU corresponding to the time axis may be different. There are a plurality of stream packs in one SOBU. SOBUs belonging to the same SOB contain the same number of stream packs.

The stream pack consists of a pack header and a stream packet. The stream packet includes one or more application packets (AP_PKTs). An application packet indicates a fragment of a bitstream that is input / output when the recording / reproducing apparatus records / reproduces data. The application time stamp (ATS) is located in front of the application packet. ATS means the play time information of the application packet located immediately after. The start and end of the application packet may not match the start and end of the stream pack. In other words, application packets may be located across the boundaries of the stream pack, that is, the boundaries of neighboring SOBUs.

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On the other hand, in order to be able to arbitrarily access the recorded program as shown in FIG. The search information may include location information of predetermined data in the program, information of a reproduction time of the program, and information of a recording time of the program. The search information may have various formats according to the application field, but the hierarchical structure is often used to refer to the data in the program in order to reduce the amount of information and enable fast searching.

If the search information constituting the program is composed of three layers of cells, SOBs, and SOBUs, the search information indicates information about a cell corresponding to a predetermined program, and information indicating what SOB corresponds to a predetermined cell. , And information indicating what is an SOBU corresponding to a predetermined SOB. In particular, the information indicating the SOBU corresponding to the SOB is called a mapping list (MAPL).

The mapping list includes an Incremental Application Packet Arrival Time (IAPAT) indicating the duration of the corresponding SOBU. According to DVD-SR Draft 0.9, in order to obtain IAPAT, the arrival time of an application packet belonging to a corresponding SOBU is required.

Meanwhile, according to the DVD-SR Draft 0.9, the size of the application packet (AP_PKT_SZ) is

AP_PKT_SZ ≤ 2018 * [SOBU_SZ] -2

Has a range of. Here, SOBU_SZ means the size of the SOBU. The above expression assumes that one SOBU has as many stream packs as SOBU_SZ, and at least 30 bytes are needed for the pack header, and 2 bytes for the header extension and stuffing packet defined in the stream packet are defined. It was decided in consideration. That is, subtracting 2 bytes from 2018 byte minus 30 bytes from 2048 byte for one SOBU becomes the maximum area for the application packet.

However, according to the range of the size of the application packet described above, there is a case where ATS does not exist in one SOBU.

2 illustrates a case where an ATS does not exist in one SOBU.

When the last stream pack belonging to the SOB is located as shown in FIG. 2, the first byte constituting the ATS is not included in SOBU # M-1, and SOBU #M indicates that a part of the application packet configured in the last stream pack is located. There is no included ATS because it is only.

As described above, according to the size of the application packet defined in the DVD-SR Draft 0.9, a corresponding ATS such as SOBU # M-1 and SOBU #M does not exist. There is a problem that an IAPAT cannot be obtained for a SOBU in which a corresponding ATS does not exist, and thus, a mapping list composed of IAPATs cannot be obtained as search information, and thus a search for a program is impossible.

In particular, in DVD-SR Draft 0.9, when the last SOBU of the SOB does not have a corresponding ATS, as shown in FIG. 3, the IAPAT is obtained by using a value obtained by copying the ATS of the last application packet. According to the rule for calculating IAPAT defined in Draft 0.9, the mapping composed of IAPAT because IAPAT (M-1), which is the value of IAPAT of SOBU # M-1, and IAPAT (M), which is the value of IAPAT of SOBU #M, are all 0. The list-based search of programs will not work properly. Because as defined in DVD-SR Draft 0.9, IAPAT (i) must meet the following conditions:

1 <= IAPAT (i) <212, i = 1

1 <= IAPAT (i) <212-1, 1 <i <M

0 <= IAPAT (i) <212-1, i = M

However, referring to FIG. 3, IAPAT (M-1) becomes 0, which is inconsistent with the above condition.

Accordingly, an object of the present invention is to provide a recording medium including the content stream data recorded in a data structure in which a SOBU included in an SOB has a corresponding ATS, so that a search of a program based on a mapping list can be performed properly, a recording apparatus, and reproduction thereof. To provide a device.

According to an embodiment of the present invention, a recording medium in which content stream data is recorded as a stream object (SOB) in which at least one stream object unit (SOBU) having a predetermined size is collected, wherein the SOBU is one or more stream packs. Wherein the stream pack includes an application time stamp (ATS) indicating the reproduction time information and an application packet packed with content stream data, and stuffing packets among remaining SOBUs except the last SOBU among the SOBUs. The remainder except for the SOBU is achieved by a recording medium, each comprising at least two ATSs.
The size of the application packet is preferably small enough to allow the SOBU to include at least two ATSs, and more preferably satisfies the following equation.

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AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ]

Where ATS_SZ is the size of the ATS in bytes, SPayload_SZ is the size of the data space that can hold the information except the fixed header area in the stream pack, and N_AHE is the number of Application Header Extensions of the corresponding SOBU. , N_SByte means the number of stuffing bytes of the corresponding SOBU.

SOBU_SZ means the size of the SOBU.

The recording medium may further include a mapping list (MAPL: Mapping List) having IAPAT (Incremental Application Packet Arrival Time) indicating a duration of the corresponding SOBU as search information indicating which SOBU corresponds to the SOB. Include.

In addition, the object of the present invention is a recording medium recorded as an SOB in which at least one SOBU having a predetermined size of content stream data is gathered, wherein the SOBU includes one or more stream packs, and the stream packs include play time information. And an application packet packed with a time stamp ATS and a content stream data, wherein each of the SOBUs except for the last SOBU includes at least two ATSs except for a SOBU including a stuffing packet. The remaining SOBU is also achieved by a recording medium comprising a pre-determined ATS and a compensating stuffing packet recorded in connection with the stream pack.

The correction stuffing packet is continuously recorded in the last application packet, the ATS included in the correction stuffing packet has the same value as the ATS included in the last stream pack, and the payload in which predetermined data is recorded or no data is recorded. It is preferable to further include a payload, and it is particularly preferable that 0 is recorded in the payload.

The size of the application packet is small enough to allow the SOBU to include at least two ATSs, and it is preferable that the following equation is satisfied.

AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ]

Where ATS_SZ is the size of the ATS in bytes, SPayload_SZ is the size of the data space that can hold the information except the fixed header area in the stream pack, and N_AHE is the number of Application Header Extensions of the corresponding SOBU. , N_SByte means the number of stuffing bytes of the corresponding SOBU.

The search information indicating what is the SOBU corresponding to the SOB, and further includes a mapping list (MAPL) having an incremental application packet arrival time (IAPAT) indicating a duration of the corresponding SOBU.

According to another aspect of the present invention, there is provided a recording apparatus for recording content stream data into an SOB composed of at least one SOBU having a predetermined size, comprising: a controller for generating a mapping list as search information; A clock generator for generating a clock value; A buffer unit for adding a clock value supplied from the clock generator to the input content stream data, buffering the buffer, and outputting the buffer at an appropriate speed; A SOBU generation unit for packing the content stream data output from the buffer unit to generate an SOBU so that each of the remaining SOBUs except for the last SOBU except the SOBU including stuffing packets includes at least two ATSs; And a recording unit for recording the SOBU generated from the SOBU generation unit and the mapping list generated by the control unit.

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The size of the application packet is small enough to allow the SOBU to include at least two ATSs, and it is preferable that the following equation is satisfied.

AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ]

Where ATS_SZ is the size of the ATS in bytes, SPayload_SZ is the size of the data space that can hold information except the fixed header area in the stream pack, and N_AHE is the number of Application Header Extensions of the corresponding SOBU. , N_SByte means the number of stuffing bytes of the corresponding SOBU.

The mapping list is discovery information indicating what SOBU corresponds to the SOB, and includes IAPAT (Incremental Application Packet Arrival Time) indicating a duration of the corresponding SOBU.

A recording apparatus for recording content stream data into an SOB composed of at least one SOBU having a predetermined size, comprising: a control unit for generating a mapping list as search information; A clock generator for generating a clock value; A buffer unit for adding a clock value supplied from the clock generator to the input content stream data, buffering the buffer, and outputting the buffer at an appropriate speed; In generating the SOBU, the SOBU having no corresponding ATS includes: a SOBU generation unit including a correction stuffing packet including an ATS having the same value as the last ATS among the ATSs belonging to the immediately preceding SOBU; And a recording unit for recording the SOBU generated from the SOBU generation unit and the mapping list generated by the control unit.

Each of the SOBUs except for the last SOBU includes all of at least two ATSs, the SOBU generation unit includes the correction stuffing packet in the last SOBU, and the recording unit includes the last application packet included in the SOB. It is preferable to record continuously after the packet.

The ATS included in the correction stuffing packet has the same value as the ATS included in the last stream pack, and the correction stuffing packet further includes a payload in which predetermined data is recorded or no data is recorded. The recording unit preferably records zero in the payload.

And at least one stream pack S_PCK including an application packet A_PKT packed with ATS and content stream data, wherein the stream packs arranged in a row are divided into predetermined sizes and sequentially assigned to each other. A recording apparatus for recording a SOB (Stream OBject) including an SOBU of the SOBU, except for the last SOBU of the SOBU, each of which includes at least two ATSs, comprising: a clock generator for generating a clock value; A buffer unit for adding a clock value supplied from the clock generator to the input content stream data, buffering the buffer, and outputting the buffer at an appropriate speed; A SOBU generation unit for generating an SOBU by packing the content stream data output from the buffer unit; The last SOBU which does not have a corresponding ATS is considered to have a virtual ATS control unit for generating a mapping list as discovery information; And a recording unit for recording the SOBU generated from the SOBU generation unit and the mapping list generated by the control unit.

The controller generates a mapping list including an incremental application packet arrival time (IAPAT) obtained by considering the ATS of the last stream pack belonging to the SOB as the virtual ATS.

The size of the application packet is small enough to allow the SOBU to include at least two ATSs, and it is preferable that the following equation is satisfied.

AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ]

Where AP_PKT_SZ is the size of the application packet, SOBU_SZ is the size of the SOBU, ATS_SZ is the size of the ATS in bytes, and SPayload_SZ is the size of the data space that can hold information in the stream pack, excluding the fixed header region, and N_AHE corresponds. The number of Application Header Extensions of the SOBU (N_SByte) means the number of stuffing bytes of the corresponding SOBU.

On the other hand, according to another field of the present invention, the object is recorded as a stream object (SOB) composed of at least one stream object unit (SOBU) having a predetermined size of the content stream data, the SOBU is one or more streams A pack, wherein the stream pack includes an application time stamp (ATS) indicating the play time information and an application packet packed with content stream data, and stuffing packets of the remaining SOBUs except the last SOBU in the SOBU Each of the remaining SOBUs includes at least two ATSs, and the last SOBU is regarded as having a virtual ATS, and a reproduction for reproducing content stream data from a recording medium on which a mapping list generated as search information is recorded. An apparatus, comprising: a reading unit for reading a mapping list and the SOBU as search information; A controller configured to control the reader to read the corresponding SOBU by referring to the mapping list read by the reader; A clock generator for generating a clock value; An SOBU analyzer for extracting content stream data by analyzing the SOBU read by the reader from the controller; And a buffer unit for buffering and outputting the content stream data provided from the SOBU analyzing unit based on the clock value supplied from the clock generating unit at an appropriate speed.

The size of the application packet preferably satisfies the following equation.

AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ]

Where AP_PKT_SZ is the size of the application packet, SOBU_SZ is the size of the SOBU, ATS_SZ is the size of the ATS in bytes, and SPayload_SZ is the size of the data space that can hold information in the stream pack, excluding the fixed header region, and N_AHE corresponds. The number of Application Header Extensions of the SOBU (N_SByte) means the number of stuffing bytes of the corresponding SOBU.

The mapping list is discovery information indicating what SOBU corresponds to the SOB, and includes IAPAT (Incremental Application Packet Arrival Time) indicating a duration of the corresponding SOBU.

In addition, the object is recorded as a SOB (Stream OBject) composed of at least one SOBU (Stream OBject Unit) having a content stream data having a predetermined size, the SOBU includes one or more stream packs, the stream The pack includes an application time stamp (ATS) indicating the play time information and an application packet packed with content stream data, and the rest of the SOBUs except for the last SOBU except for the SOBU including stuffing packets A reproducing apparatus for reproducing content stream data from a recording medium including at least two ATSs in total and the last SOBU includes a correction stuffing packet having a predetermined ATS, the read list for reading the mapping list and the SOBU as search information. Reading unit; A controller configured to control the reader to read the corresponding SOBU by referring to the mapping list read by the reader; A clock generator for generating a clock value; An SOBU analyzer for extracting content stream data by analyzing the SOBU read by the reader from the controller; And a buffer unit for buffering and outputting the content stream data provided from the SOBU analyzing unit based on the clock value supplied from the clock generating unit at an appropriate speed.

The ATS included in the correction stuffing packet has the same value as the ATS included in the last stream pack, and the correction stuffing packet further includes a payroad in which predetermined data is recorded or no data is recorded. It is preferable.

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Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The recording medium according to the present invention is a rewritable recording medium which allows a user to directly record and edit a program consisting of content stream data. Recording the content stream data means recording the input content stream data as it is without encoding. That is, a method of receiving and buffering audio or video stream data such as music or movie, packing them in predetermined recording units, and recording them on a recording medium.

The DVD (Digital Versatile Disc) -SR (Stream Recording) recording medium according to the present embodiment includes at least one program recorded in SOB and navigation information for navigation of the program.

Here, the SOB means a program such as music or movie recorded as content stream data as in the related art, and includes one or more stream packs S_PCK. SOBU is divided into one or more stream packs arranged in a row to have a constant size. Therefore, one SOBU may include a plurality of stream packs, but the start and end of the stream pack may not coincide with the start and end of the SOBU. That is, stream packs may be located across the boundaries of the SOBU.

The stream pack consists of a pack header and a stream packet. The stream packet includes one or more application packets (AP_PKTs). An application packet indicates a fragment of a bitstream that is input / output when the recording / reproducing apparatus records / reproduces data. Therefore, the ATS is located before the application packet.

The search information includes a hierarchical structure including information indicating what cells correspond to a given program, information indicating what SOB corresponds to a given cell, and information indicating what SOBU corresponds to a given SOB. Have In particular, the information indicating the SOBU corresponding to the SOB is called a mapping list (MAPL). The mapping list includes an Incremental Application Packet Arrival Time (IAPAT) indicating the duration of the corresponding SOBU. The rules for obtaining the IAPAT will be described later.

Meanwhile, according to the present invention, the remaining SOBU except the last SOBU belonging to a predetermined SOB includes at least two ATSs. In other words, at least two ATSs have their first byte included in the corresponding SOBU. This is because the size (AP_PKT_SZ) of the application packet according to the present invention satisfies the following equation. However, this is not the case in SOBU including stuffing packets. Here, the stuffing packet is packet data that is forcibly inserted in order to prevent the overflow of the IAPAT when the SOBU cannot be filled with the application packet even with the maximum duration that can be represented by the IAPAT at a low bit rate. Its main purpose is to be independent of the content and used for timing regeneration required for playback.

The size of the application packet is limited to the range represented by the following general formula.

AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ]

Where AP_PKT_SZ is the size of the application packet, SOBU_SZ is the size of the SOBU, ATS_SZ is the size of the ATS in bytes, and SPayload_SZ is the size of the data space that can hold information in the stream pack, excluding the fixed header area, and N_AHE corresponds. The number of Application Header Extensions of the SOBU (N_SByte) means the number of stuffing bytes of the corresponding SOBU.

The general formula can be simplified by applying the following special cases.

That is, as mentioned in the problem of the prior art, assuming that one SOBU has as many stream packs as SOBU_SZ, at least 30 bytes (fixed header size) are required for the pack header and the header extension defined in the stream packet If both (Header extention) and Stuffing Packet (Stuffing Packet) are 2 bytes, 2018 * [SOBU_SZ] -2 remains. Here, 2018 refers to a size of a data space (SPayload_SZ) that can hold information except the size of a fixed header region in a stream pack of 2048 size. However, considering that the size of the ATS is 4 bytes, if the size of the application packet is smaller than or equal to 2018 * [SOBU_SZ / 2] -6 according to the present invention, except for the SOBU including stuffing packets among the remaining SOBUs except the last SOBU. The rest will contain the first byte of at least two ATSs each. The general formula is thus simplified as follows.

(AP_PKT_SZ + 4) * 2 ≤ 2018 * [SOBU_SZ] -2 * 2

AP_PKT_SZ ≤ 2018 * [SOBU_SZ / 2] -6

Meanwhile, according to the present invention, a data structure for allowing the last SOBU to have IAPAT may be implemented in two embodiments described below.

First, a first embodiment of a data structure for allowing the last SOBU to have IAPAT will be described.

4 is a data structure diagram according to a first embodiment of the present invention.

Referring to FIG. 4, the SOB is formed of an SOBU chain in which M SOBUs are connected. Since the size of the application packet has the size as described above according to the present invention, the remaining SOBUs except the last SOBU contain at least two first bytes of ATS. That is, SOBU # M-1 includes the first bytes of ATS # N-1 and ATS #N.

On the other hand, the SOBU #M does not include the ATS and part or all of the application packet AP_PKT #N belongs. That is, when there is no ATS belonging to SOBU #M which is the last SOBU, the correction stuffing packet 100 is recorded after AP_PKT #N which is the last application packet according to the present embodiment. The correction stuffing packet 100 is composed of an ATS #N 101 and a payload 102. That is, the ATS included in the correction stuffing packet has a value copied from the ATS #N added to the AP_PKT #N as it is. 0 is recorded in the payload 102 according to the present embodiment. On the other hand, since the SOB is actually terminated with the last application packet AP_PKT #N and data recorded after the last application packet AP_PKT #N is not read even when the SOB is reproduced, the format and contents of the data recorded in the payload 102 Various changes can be made as needed. At times, no data may be recorded in the payload 102.

Next, a data structure according to the second embodiment for allowing the last SOBU to have IAPAT will be described.

5 is a data structure diagram according to a second embodiment of the present invention.

Referring to FIG. 5, an SOB is formed of an SOBU chain in which M SOBUs are connected. Since the size of the application packet has the size as described above according to the present invention, the remaining SOBUs except the last SOBU contain at least two first bytes of ATS. That is, SOBU # M-1 includes the first bytes of ATS # N-1 and ATS #N.

At this time, the ATS belonging to SOBU #M has the same value as ATS #N added to AP_PKT #N as described above with reference to FIG. 4, but is not actually recorded. In other words, in calculating the IAPAT value required when recording the mapping list as the search information, the ATS #N is read and only this value is regarded as the ATS included in the SOBU #M. However, IAPAT obtained by considering ATS #N as an ATS for SOBU #M is recorded in the mapping list as search information.

According to the first and second embodiments described with reference to FIGS. 4 and 5, the first ATS belonging to SOBU # M-1 and SOBU #M becomes ATS # N-1 and ATS #N, respectively, and different values are obtained. Therefore, the value of IAPAT of SOBU # M-1 does not become zero. In other words, IAPAT values of all SOBUs can be properly obtained for all SOBUs according to the rules set forth in DVD-SR Draft 0.9. As a result, all SOBUs have IAPAT values that can be distinguished from each other, so that a program search made by referring to a mapping list can be smoothly performed without errors.

Meanwhile, according to the DVD-SR Draft 0.9, the rules for obtaining IAPAT are as follows.                     

If there are M SOBUs in one SOB, the cumulative sum from the first IAPAT IAPAT (1) to the i th IAPAT IAPAT (i) for the i th SOBU (i) excluding SOBU #M is the SOBU (i It must be greater than or equal to the arrival time of the first application packet of +1) and less than the sum of the arrival time of the first application packet of SOBU (i + 1). At this time, IAPAT has an integer value and the initial value is 0. The expression is as follows.

SOBU_S_APAT (i + 1) <= SUM_IAPAT (i) <SOBU_S_APAT (i + 1) +1

Here, SOBU_S_APAT (i + 1) is the sum of the arrival time of the first application packet belonging to SOBU # i + 1, and SUM_IAPAT (i) is the sum of IAPAT values of all preceding SOBUs including the corresponding SOBU #i. it means.

In addition, SOBU #M must be equal to or larger than the arrival time of the last application packet belonging to SOBU #M and the sum of IAPATs is less than or equal to the arrival time of the last application packet belonging to SOBU #M. The expression is as follows.

SOBU_E_APAT (M) <SUM_IAPAT (M) <SOBU_E_APAT (M) +1

Here, SOBU_E_APAT (M) means the arrival time of the last application packet belonging to SOBU #M.

6 is a block diagram of a recording apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 6, the recording device 5 is a recording device for recording contents such as music, movies, and the like into one SOB having a data structure as described above, and includes a buffer unit 51, a clock generation unit 52, The SOBU generation unit 53, the recording unit 55, and the control unit 56 are provided. The buffer unit 51 receives the content stream from the outside and buffers the content stream based on the clock value supplied from the clock generation unit 52 and outputs the buffer at an appropriate speed. The SOBU generation unit 53 packs the content stream to generate an SOBU. The recording unit 55 records the search information such as the SOBU and the mapping list on the optical disk 500 under the control of the control unit 56. The controller 56 generates a mapping list and provides it to the recording unit 55 while controlling the recording apparatus 5 collectively so that the content stream is recorded on the optical recording medium 500.

First, the recording method according to the first embodiment of the present invention will be described.

When the content stream is input to the buffer unit 51 from an application device such as a set-top-box, and the user presses a record button (not shown) provided in the recording device, the controller 56 clocks. The generation unit 52 is reset. The clock generator 52 generates a clock value from zero and provides the clock value to the buffer 51.

The buffer unit 51 adds the clock value received from the clock generator 52 to the received content stream, and buffers the received content stream to output at an appropriate speed. The SOBU generation unit 53 packs the content stream received from the buffer unit 51 to generate an SOBU. The generated SOBU is transferred to the recording unit 55, and the recording unit 55 records the received SOBU on the optical disc 500 based on the control of the controller 56.

In this case, as shown in FIG. 4, when at least two ATSs are included in the SOBUs belonging to the SOB except for the last SOBU, and there are no ATSs belonging to the last SOBU, subsequent correction is performed after AP_PKT #N. The stuffing packet 100 is recorded. In the present embodiment, the ATS #N 101 is copied and recorded as the ATS included in the correction stuffing packet 100. 0 is recorded in the payload 102 according to the present embodiment.

In addition, the recording unit 55 records the mapping list received from the control unit 56 as the navigation information recording area navigation data of the optical disc 500.

Next, a recording method according to the second embodiment of the present invention will be described.

When the content stream is input to the buffer unit 51 from an application device such as a set-top-box, and the user presses a record button (not shown) provided in the recording device, the controller 56 clocks. The generation unit 52 is reset. The clock generator 52 generates a clock value from zero and provides the clock value to the buffer 51.

The buffer unit 51 adds the clock value received from the clock generator 52 to the received content stream, and buffers the received content stream to output at an appropriate speed. The SOBU generation unit 53 packs the content stream received from the buffer unit 51 to generate an SOBU. The generated SOBU is transferred to the recording unit 55, and the recording unit 55 records the received SOBU on the optical disc 500 based on the control of the controller 56.

In addition, the recording unit 55 records the mapping list as the search information recording area navigation data of the optical disc 500. Here, the mapping list is generated by the controller 56 and provided to the recording unit 55. More specifically, as shown in FIG. 5, the controller 56 reads ATS #N, regards this value as the ATS of SOBU #M, and maps the IAPAT value obtained by the above-described rule based on this value to the mapping list. To record. In other words, the ATS of SOBU #M has the same value as ATS #N, but is not a value actually recorded as data, but a virtual value used by the controller in calculating the IAPAT value constituting the mapping list.

7 is a block diagram of a playback apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 7, the playback apparatus is a playback apparatus for playing back contents from the optical disc 600 recorded in the data structure as described with reference to FIGS. 4, 5, and 6, and includes a control unit 66 and a reading unit 65. ), A SOBU analyzer 64, a clock generator 62, and a buffer 61.

The control unit 66 collectively controls the playback apparatus so as to decode the various control information including the mapping list and reproduce the contents recorded on the optical recording medium 600 based on the user's request. The reading unit 65 reads data from the optical recording medium 600. The SOBU analysis unit 64 analyzes the read SOBU to extract content stream data constituting the content, and the buffer unit 61 buffers the content stream data based on the clock value supplied from the clock generation unit 62. Ensure that content stream data is output at an appropriate rate.

First, the playback method according to the first embodiment of the present invention will be described.

When the user presses a play button (not shown) provided in the playback device to request playback of predetermined content, the controller 66 reads out search information including a mapping list recorded in the optical recording device 600. Instructs 65 to receive the search information including the mapping list transmitted from the reader 65 to find the SOB or the SOBU. In this case, as shown in FIG. 4, even when the optical recording medium 600 includes at least two ATSs except for the last SOBU among the SOBUs belonging to the SOB and the ATS belonging to the last SOBU does not exist, the last application packet is present. Following the AP_PKT #N, the correction stuffing packet 100 including the ATS #N is recorded, and the mapping list having the IAPAT obtained based thereon is recorded as the search information, so that the content can be easily searched and played back at the desired location. Can be done.

On the other hand, the controller 66 resets the clock generator 62. The clock generator 62 generates a clock value from zero and provides the clock value to the buffer 61.

The reading unit 65 reads the content recorded in the SOBU and provides it to the SOBU analyzing unit 64. The SOBU analyzing unit 64 extracts content stream data from the provided SOBU. The buffer unit 61 outputs the corresponding content stream data when the clock value provided from the clock generator 62 becomes equal to the clock value added to the received content stream data.

Next, a reproduction method according to a second embodiment of the present invention will be described.

When the user presses a play button (not shown) provided in the playback device to request playback of predetermined content, the controller 66 reads out search information including a mapping list recorded in the optical recording device 600. Instructs 65 to receive the search information including the mapping list transmitted from the reader 65 to find the SOB or the SOBU. In this case, as shown in FIG. 5, the optical recording medium 600 includes at least one ATS except for the last SOBU among SOBUs belonging to the SOB and the ATS belonging to the last SOBU exists in the SOB #M. Since the mapping list including the IAPAT obtained by considering that the ATS #N is included is recorded as the search information, the content can be searched and the content can be played back at a desired position.

On the other hand, the controller 66 resets the clock generator 62. The clock generator 62 generates a clock value from zero and provides the clock value to the buffer 61.

The reading unit 65 reads the content recorded in the SOBU and provides it to the SOBU analyzing unit 64. The SOBU analyzing unit 64 extracts content stream data from the provided SOBU. The buffer unit 61 outputs the corresponding content stream data when the clock value provided from the clock generator 62 becomes equal to the clock value added to the received content stream data.

8 is a block diagram of a recording / playback apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 8, the recording and reproducing apparatus 7 is an integrated implementation of the recording apparatus 5 of FIG. 6 and the playback apparatus 6 of FIG. 7. A recording / reading section 75 for recording contents into one SOB having a data structure and reproducing contents from the optical disc 700 recorded with the data structure as described with reference to FIGS. 4, 5, and 6 during reproduction; The SOBU generation unit 73, the SOBU analysis unit 74, the buffer unit 71, the clock generation unit 72, and the control unit 76 are provided.

The buffer unit 71 receives the content stream data from the outside at the time of recording, buffers it based on the clock value supplied from the clock generator 72, outputs the buffer at an appropriate speed, and the clock supplied from the clock generator 62 during reproduction. By buffering the content stream data based on the value, the content stream data is output at an appropriate speed.

The SOBU generation unit 73 packs the content stream data to generate an SOBU. The SOBU analyzing unit 74 analyzes the SOBU to extract content stream data constituting the content.

The recording / reading unit 75 records the search information such as the SOBU and the mapping list on the optical disc 700 based on the content stream packed into the SOBU and the control of the control unit 76 at the time of recording, and at the time of reproduction, the control unit ( 76, the search information or SOBU including the mapping list recorded on the optical disc 700 is read out as requested.

The control unit 76 generates a mapping list during recording and provides the recording / reading unit 75 to the recording / reading unit 75, while totally controlling the recording / playback apparatus 7 so that the content stream data is recorded on the optical disc 700. Various control information, including the control unit, to control the recording and reproducing apparatus so that the contents recorded on the optical disc 700 can be reproduced based on the user's request.

Since the recording and reproducing methods of the recording and reproducing apparatus according to the above constitution are the same as those of the above-described recording and reproducing apparatus, repeated description thereof will be omitted.

As a result, the IAPAT value can be properly obtained for all SOBUs, so that the program search made with reference to the mapping list can be performed smoothly without error.

Claims (41)

In the recording medium recorded in SOB (Stream OBject) is formed by collecting at least one stream object unit (SOBU) having a predetermined size of the content stream data, The SOBU includes one or more stream packs, The stream pack includes an application packet packed with an application time stamp (ATS) indicating content time and content stream data. The recording medium of claim 1, wherein the remaining SOBU except for the last SOBU except for the SOBU including the stuffing packet includes at least two ATSs. The method of claim 1, The size of the application packet is small enough to allow the SOBU to include at least two ATS. The method of claim 2, The size of the application packet satisfies the following equation. AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ] Where AP_PKT_SZ is the size of the application packet, ATS_SZ is the size of the ATS in bytes, SPayload_SZ is the size of the data space that can hold the information except the fixed header area in the stream pack, and N_AHE is the number of application header extensions in the corresponding SOBU ( N_SByte means the number of stuffing bytes of the corresponding SOBU. The method of claim 3, The size of the application packet satisfies the following equation. AP_PKT_SZ ≤ 2018 * [SOBU_SZ / 2] -6 Here, AP_PKT_SZ means the size of the application packet, and SOBU_SZ means the size of the SOBU. The method according to any one of claims 1 to 4, Search information indicating which SOBU corresponds to the SOB, and further includes a mapping list (MAPL) having an incremental application packet arrival time (IAPAT) indicating a duration of the corresponding SOBU. Recording medium. Claims [1] A recording medium recorded on an SOB in which at least one SOBU having a predetermined size of content stream data is collected. The SOBU includes one or more stream packs, The stream pack includes an application packet packed with a time stamp ATS and content stream data indicating playback time information. Each of the SOBUs except for the last SOBU except for the SOBU including stuffing packets includes all of at least two ATSs, And the remaining SOBU includes a correction stuffing packet including a predetermined ATS and connected to and recorded in the stream pack. The method of claim 6, And the correction stuffing packet is continuously recorded in the last application packet. The method of claim 7, wherein And the ATS included in the correction stuffing packet has the same value as the ATS included in the last stream pack. The method of claim 8, The stuffing packet for correction further comprises a payload in which predetermined data is recorded or no data is recorded. The method of claim 9, And 0 is recorded in the payload. The method according to any one of claims 6 to 10, The size of the application packet is small enough so that the rest of the SOBU except for the last SOBU each include at least two ATS. The method of claim 11, The size of the application packet satisfies the following equation. AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ] Where AP_PKT_SZ is the size of the application packet, ATS_SZ is the size of the ATS in bytes, SPayload_SZ is the size of the data space that can hold the information except the fixed header area in the stream pack, and N_AHE is the number of application header extensions in the corresponding SOBU ( N_SByte means the number of stuffing bytes of the corresponding SOBU. The method of claim 12, The size of the application packet satisfies the following equation. AP_PKT_SZ ≤ 2018 * [SOBU_SZ / 2] -6 Here, AP_PKT_SZ means the size of the application packet, and SOBU_SZ means the size of the SOBU. The method of claim 13, Search information indicating which SOBU corresponds to the SOB, and further includes a mapping list (MAPL) having an incremental application packet arrival time (IAPAT) indicating a duration of the corresponding SOBU. Recording medium. A recording apparatus for recording content stream data into an SOB composed of at least one SOBU having a predetermined size, A controller for generating a mapping list as search information; A clock generator for generating a clock value; A buffer unit for adding a clock value supplied from the clock generator to the input content stream data, buffering the buffer, and outputting the buffer at an appropriate speed; A SOBU generation unit for packing the content stream data output from the buffer unit to generate an SOBU so that all but the last SOBU of the SOBU include at least two application time stamps (ATS); And And a recording unit for recording the SOBU generated from the SOBU generation unit and the mapping list generated by the control unit. The method of claim 15, And the size of the application packet is small enough so that the remainder each contains at least two ATSs. The method of claim 16, And the size AP_PKT_SZ of the application packet satisfies the following equation. AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ] Where ATS_SZ is the size of the ATS in bytes, SPayload_SZ is the size of the data space that can hold the information except the fixed header area in the stream pack, and N_AHE is the number of Application Header Extensions of the corresponding SOBU. , N_SByte means the number of stuffing bytes of the corresponding SOBU. The method of claim 17, And the size of the application packet satisfies the following equation. AP_PKT_SZ ≤ 2018 * [SOBU_SZ / 2] -6 Here, AP_PKT_SZ means the size of the application packet, and SOBU_SZ means the size of the SOBU. The method according to any one of claims 15 to 18, And the mapping list is search information indicating what SOBU corresponds to the corresponding SOB, and includes an incremental application packet arrival time (IAPAT) indicating a duration of the corresponding SOBU. A recording apparatus for recording content stream data into an SOB composed of at least one SOBU having a predetermined size, A controller for generating a mapping list as search information; A clock generator for generating a clock value; A buffer unit for adding a clock value supplied from the clock generator to the input content stream data, buffering the buffer, and outputting the buffer at an appropriate speed; In generating the SOBU, an SOBU having no corresponding time stamp (ATS) generates an SOBU including a correction stuffing packet including an ATS having the same value as the last ATS among the ATSs belonging to the immediately preceding SOBU. part; And And a recording unit for recording the SOBU generated from the SOBU generation unit and the mapping list generated by the control unit. The method of claim 20, Each of the SOBUs except for the last SOBU except for the SOBU including stuffing packets includes all of at least two ATSs, The SOBU generation unit includes the correction stuffing packet in the last SOBU, And the recording unit continuously records the correction stuffing packet following the last application packet included in the SOB. The method of claim 21, And the ATS included in the correction stuffing packet has the same value as the ATS included in the last stream pack. The method of claim 22, The correction stuffing packet further comprises a payload in which predetermined data is recorded or no data is recorded. The method of claim 23, wherein And the recording unit writes zeros to the payload. A recording apparatus for recording content stream data into an SOB composed of at least one SOBU having a predetermined size, A clock generator for generating a clock value; A buffer unit for adding a clock value supplied from the clock generator to the input content stream data, buffering the buffer, and outputting the buffer at an appropriate speed; A SOBU generation unit for generating an SOBU by packing the content stream data output from the buffer unit; The last SOBU which does not have a corresponding time stamp Application Time Stamp (ATS) comprises: a control unit for generating a mapping list as search information, considering the virtual ATS; And And a recording unit for recording the SOBU generated from the SOBU generation unit and the mapping list generated by the control unit. The method of claim 25, And the controller generates a mapping list including an incremental application packet arrival time (IAPAT) obtained by considering the ATS of the last stream pack belonging to the SOB as the virtual ATS. 27. The method according to claim 25 or 26. And the size of the application packet is small enough that each of the SOBUs except for the last SOBU includes at least two ATSs. The method of claim 27, And the size of the application packet satisfies the following equation. AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ] Where AP_PKT_SZ is the size of the application packet, ATS_SZ is the size of the ATS in bytes, SPayload_SZ is the size of the data space that can hold the information except the fixed header area in the stream pack, and N_AHE is the number of application header extensions in the corresponding SOBU ( N_SByte means the number of stuffing bytes of the corresponding SOBU. The method of claim 28, And the size AP_PKT_SZ of the application packet satisfies the following equation. AP_PKT_SZ ≤ 2018 * [SOBU_SZ / 2] -6 Here, SOBU_SZ means the size of the SOBU. A reproducing apparatus for reproducing content stream data from a recording medium recorded with SOB (Stream OBject) in which at least one stream object unit (SOBU) having a predetermined size of content stream data is collected. A reader for reading the mapping list and the SOBU as search information; A controller configured to control the reader to read the corresponding SOBU by referring to the mapping list read by the reader; A clock generator for generating a clock value; An SOBU analyzer for extracting content stream data by analyzing the SOBU read by the reader from the controller; And And a buffer unit for buffering and outputting the content stream data provided from the SOBU analyzer based on the clock value supplied from the clock generator. The method of claim 30, And the size AP_PKT_SZ of the application packet satisfies the following equation. AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ] Where ATS_SZ is the size of the ATS in bytes, SPayload_SZ is the size of the data space that can hold the information except the fixed header area in the stream pack, and N_AHE is the number of Application Header Extensions of the corresponding SOBU. , N_SByte means the number of stuffing bytes of the corresponding SOBU. The method of claim 31, wherein The size of the application packet satisfies the following equation. AP_PKT_SZ ≤ 2018 * [SOBU_SZ / 2] -6 Here, AP_PKT_SZ means the size of the application packet, and SOBU_SZ means the size of the SOBU. The method according to any one of claims 30 to 32, And the mapping list is search information indicating what SOBU corresponds to the SOB, and includes an incremental application packet arrival time (IAPAT) indicating a duration of the corresponding SOBU. Content stream data is recorded as a SOB (Stream OBject) composed of at least one SOBU (Stream OBject Unit) having a predetermined size, wherein the SOBU includes one or more stream packs, and the stream packs display playback time information. An application packet packed with an application time stamp (ATS) and a content stream data to be displayed, and at least two ATSs except for the SOBU including stuffing packets among the remaining SOBUs except the last SOBU among the SOBUs A reproduction apparatus for reproducing content stream data from a recording medium including all of the remaining SOBUs and including a stuffing packet for correction having a predetermined ATS. A reader for reading the mapping list and the SOBU as search information; A controller configured to control the reader to read the corresponding SOBU by referring to the mapping list read by the reader; A clock generator for generating a clock value; An SOBU analyzer for extracting content stream data by analyzing the SOBU read by the reader from the controller; And And a buffer unit for buffering and outputting the content stream data provided from the SOBU analyzer based on the clock value supplied from the clock generator. The method of claim 34, wherein And the ATS included in the correction stuffing packet has the same value as the ATS included in the last stream pack. 36. The method of claim 35 wherein And the correction stuffing packet further includes a payroad in which predetermined data is recorded or no data is recorded. Content stream data is recorded as a SOB (Stream OBject) composed of at least one SOBU (Stream OBject Unit) having a predetermined size, wherein the SOBU includes one or more stream packs, and the stream packs display playback time information. An application packet packed with an application time stamp (ATS) and a content stream data to be displayed, and at least two ATSs except for the SOBU including stuffing packets among the remaining SOBUs except the last SOBU among the SOBUs A playback apparatus for reproducing content stream data from a recording medium having all of them included in the final SOBU, which is regarded as having a virtual ATS, and in which a mapping list generated as navigation information is recorded. A reader for reading the mapping list and the SOBU as search information; A controller configured to control the reader to read the corresponding SOBU by referring to the mapping list read by the reader; A clock generator for generating a clock value; An SOBU analyzer for extracting content stream data by analyzing the SOBU read by the reader from the controller; And And a buffer unit for buffering and outputting the content stream data provided from the SOBU analyzer based on the clock value supplied from the clock generator. The method of claim 37, And the mapping list includes an incremental application packet arrival time (IAPAT) generated by considering an ATS of a last stream pack belonging to the SOB as an integer and adding the integer as the predetermined ATS. The method of claim 37 or 38. And the size of the application packet is small enough that each of the SOBUs except for the last SOBU includes at least two ATSs. The method of claim 39, And the size of the application packet satisfies the following equation. AP_PKT_SZ ≤ SPayload_SZ * [SOBU_SZ / 2]-[ceil ((N_AHE + N_SByte) / 2) + ATS_SZ] Where AP_PKT_SZ is the size of the application packet, ATS_SZ is the size of the ATS in bytes, SPayload_SZ is the size of the data space that can hold the information except the fixed header area in the stream pack, and N_AHE is the number of application header extensions in the corresponding SOBU ( N_SByte means the number of stuffing bytes of the corresponding SOBU. The method of claim 40, And the size of the application packet satisfies the following equation. AP_PKT_SZ ≤ 2018 * [SOBU_SZ / 2] -6 Here, AP_PKT_SZ means the size of the application packet, and SOBU_SZ means the size of the SOBU.

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