JP2001028165A - Method and device for recording digital data stream and management information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To define recognition information for recognizing the addition of invalid header data so as to be completely matched with management information and the packet of a transmission stream by adding the recognition information to the header information of a recording unit. SOLUTION: The identification information of one bit showing the validity of application header extension information is recorded while being contained in each of application header extension information. Then, information corresponding to the number of application packets recorded in a unit sector is recorded in an application packet field by the identification information. This identification information and application packet number information according to the information are determined and recorded. Thus, the invalid header data distinguished from the application header extension information is inserted and recorded before the application packet and the number of application packets to be actually recorded in one unit sector is matched with the application header extension information on management information generated and recorded thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sequentially records packets such as application packets of a received digital data stream on a disk recording medium such as a DVD (Digital Versatile Disk), and searches and manages the recorded packets. The present invention relates to a digital data stream recording method and apparatus for generating and recording management information to be recorded.

[0002]

2. Description of the Related Art In a conventional analog television broadcast, a video signal to be transmitted is AM or FM modulated and transmitted through a radio wave or a cable. Recently, digital technologies such as digital video compression and digital modulation / demodulation have been developed, and standardization of digital television broadcasting is progressing at a high speed. Existing terrestrial, satellite, and cable broadcasting are also digitized based on MPEG.

[0003] Digital broadcasting can provide services with higher picture quality than analog services with the development of digital video / audio compression technology and digital transmission technology, and can transmit a large number of broadcasting programs in the same bandwidth. It has the advantage that interoperability with digital communication media and digital recording media can be improved.

In such digital broadcasting, a large number of broadcast programs encoded based on MPEG are transmitted in the form of a multiplexed transmission stream (Transport Stream: TS). The transmission stream TS is received by a set-up box provided on the receiving side, and a plurality of broadcast programs included in the transmission stream are demultiplexed to select only one desired broadcast program. The selected broadcast program is decoded by a decoder built in the setup box, and the original audio and video signals are transferred to an A / V output device such as a television.

FIG. 1 schematically shows a general digital data stream recording system. The system comprises a set-up box 100, a communication interface (IEEE 1394) and a streamer 200.
It is composed of The setup box 100 receives a transmission stream in which a number of broadcast programs encoded by a system encoder are multiplexed from a broadcasting station, and demultiplexes the received transmission stream. Further, the control section 140 selects a channel from the demultiplexed one in the channel selection processing section 110 in response to a user input. The transmission stream of the selected broadcasting program is decoded by the system decoder 120 and output through an AV set such as a television,
It is sent to the streamer 200 via the IEEE 1394 communication interface 130. The streamer 200 receives the transmission stream via the interface 210, and can record the broadcast program selected by the user on the recording medium 230 such as a digital video disk (DVD).

The set-up box 100 reads out a broadcast program recorded on the recording medium 230 and reads the broadcast program recorded on the IEEE 1394 communication interfaces 210 and 13.
0 may be received via the decoder 120, decoded by the decoder 120, and output to a television set.

As described above, a system for not only receiving a digital broadcast signal and outputting it to an A / V output device such as a television, but also recording, editing, and reproducing the received broadcast signal on a recording medium has already been proposed. ing. However, the system currently under development is concerned with how to partition and record a digital data stream on a recording medium such as a DVD and how to manage the partitioned and recorded digital data stream. The digital data stream recording method and the management information generation recording method are not yet standardized. For this reason, the current situation is that related businesses have successively proposed methods independently researched and developed for the digital data stream recording method and the management information generation recording method.

Hereinafter, a method of recording a digital data stream and a method of generating and recording management information will be described in detail with reference to the accompanying drawings.
First, FIG. 2 shows a hierarchical diagram for a recording unit of a general digital data stream. A stream object (SO
B) is a large number of recording units (SOBU: Stream Object Un
it). The recording unit is divided into a number of sectors, and each sector includes a number of application packets (AP) and header information (HDRS) for the application packets. The recording size of the application packet is 192 bytes, and the recording size of the sector is 2048 bytes. One application packet includes 4-byte time information (time stamp) indicating the packet arrival time and 1
It consists of an 88-byte data packet.

Therefore, as shown in FIG.
One unit sector having a recording size of 8 bytes is:
It is composed of header information HDRS, a plurality of application packets AP, and a padding area in which null data is recorded as necessary.

On the other hand, FIG. 3 shows a detailed configuration of the application header information and the application header extension information recorded in the header information HDRS area. The application header information is information on a number of application packets recorded in a unit sector of 2048 bytes, and includes a field indicating a header format version (Version) and a field AP_N indicating the number of application packets.
S, and the like, the application header extension information is information selectively generated and recorded for each application packet recorded in the unit sector, and has a size of 1 byte. The 1-byte application header extension information includes a field (AU) indicating whether the data stream is a start or end of a randomly accessible data stream such as base video I-Picture data.
_Start: Access Unit Start, AU_End: Acces
s Unit End) and a margin area field (Reser
ved) and a field (Copyr) indicating whether copying is prohibited or not.
right). In the figure, PER indicates a packetized elementary stream (Packetized Elementary Strategies).
ream).

Meanwhile, among methods of recording received application packets in a sector of a recording unit, a recently proposed recording method forms a padding area on a received digital data stream as shown in FIG. Instead, the entire unit sector of 2048 bytes is used as a recording area. If the last remaining area of the sector cannot accept one entire application packet, the packet is divided and a part is recorded in the sector and the rest is divided into the next sector and recorded in two sectors. In this method, null data is recorded only in the last unit sector of a stream object (SOB).

For example, as shown in FIG. 4, an application packet of 192 bytes is divided into 130 bytes and 62 bytes as shown in FIG. 4, and the last application packet AP _M-2 # 10 of the second sector of _M-2. When,
The first application packet AP _M-1 # 1 of the (M-1) -th sector is respectively recorded. At that time, M-2
The application header extension information for the second sector is
A total of 10, ie, 10 bytes of application header extended information is generated and recorded corresponding to 10 application packets including the application packet AP _M-2 # 10 divided into 130 bytes. The number AP_NS field contains' 0000001010 (= 1
0) 'is recorded.

On the other hand, in the case of the (M-1) -th sector, 62
The first application packet AP # 1 divided into bytes and the ten application packets AP _M-1 # 2 to # 11 normally recorded in the 192 bytes, and the 54 bytes (described above with reference to FIG. 3) 14 + 14 + 1 +
15) Header information and 11-byte application header extension information generated and recorded corresponding to 11 application packets are recorded, and have a recording size of 2047 bytes (= 62 + 1920 + 54 + 11).

Therefore, in order to use all the 2048-byte unit sectors, the 192-byte application packet to be received thereafter must be recorded separately in 1 byte and 191 bytes.
A new 1-byte application header extension information corresponding to the application packet must be additionally recorded in the (M-1) th sector where only bytes are recorded.

However, if the 1-byte application header extension information is additionally recorded, the sector becomes 204
A packet to be recorded when all 8 bytes have been used must be recorded in the next Mth sector. This causes a problem that the application packet recorded in the unit sector and the header extension information do not correspond one-to-one, and also causes a problem when recording the number of packets recorded in the sector at the same time. . That is, if the number of packets in the sector is recorded in the packet number field AP_NS with the number of packets actually recorded, a mismatch occurs with the number of header extension information. It does not match the number of recorded packets.

In order to avoid this, the header extension information must also be recorded in the next M-th sector, but in this case, a 1-byte unrecorded area is generated in the sector. This causes a problem that the sector which is not the last sector of the stream object does not meet the standard that the entire area must be used without an unrecorded area.

[0017]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. In recording a packet of a digital transmission stream on a unit recording area of a predetermined size, the transmission stream When only the size of the management information remains in the allocated unit recording area when the management information corresponding to one packet is generated and recorded on a one-to-one basis, it is generated corresponding to the recording stream packet and one-to-one. It is an object of the present invention to provide a digital data stream recording and management information generation recording method and apparatus for recording stream packets and management information such that the one-to-one correspondence with the management information defined as described above is maintained.

Another object of the present invention is to allocate a digital transmission stream packet to a unit recording area of a predetermined size when generating and recording management information corresponding to the transmission stream packet on a one-to-one basis. When the size of the management information remains in the unit recording area, the value of the information for managing the number of packets of the transmission stream recorded on the unit recording area is different from the management information and the packet of the transmission stream. An object of the present invention is to provide a digital data stream recording and management information generation recording method and apparatus for recording a stream packet and management information so that all of them can be determined to match.

[0019]

According to the present invention, there is provided a digital data stream recording and management information generating / recording method according to the present invention, wherein a management generated in one-to-one correspondence with each application packet recorded in a recording unit. Generating header information of the recording unit including information, and comparing the generated header information and the size of the application packet to be recorded with the size of the recording unit;
Based on the comparison result, adding invalid header data to the header information so that the correspondence between each application packet recorded in the recording unit and each management information thereof does not become inconsistent, and adding the invalid header data. Recording additional recognition information for recognition to the header information of the recording unit.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 5 shows the configuration of the application header information and the application header extension information according to the present invention, and also refer to FIG. 2 and FIG. As described above, the header information HDR
The application header information in the S area is information on a large number of application packets recorded in a unit sector of 2048 bytes. It includes a field indicating the version of the header format, a field AP_NS indicating the number of application packets, and the like. There is no particular difference from the conventional application header information. The application header extension information is selection information generated and recorded in one-to-one correspondence with each application packet recorded in a unit sector,
It has a size of one byte. The 1-byte application header extension information includes fields (AU_Start, AU_End) indicating whether recording of a data stream that can be randomly accessed, such as base video I-Picture data, is started or ended, and a margin area. A field (Reserved), a field (Copyright) indicating whether or not copying is prohibited, and identification information N indicating whether the validity of the application header extension information is valid.
ul_Flag. The conventional one is Nu
The difference is that the ll_Flag is prepared. The application header extension information is recorded in a concentrated manner before the first application packet composed of a 4-byte time stamp and a 188-byte data packet.

That is, in the digital data stream recording method and the management information generation recording method according to the present invention, 1-bit identification information Null_Flag indicating whether the application header extension information is valid is included in each application header extension information and recorded. Let it. Then, information on the number of application packets recorded in the unit sector is recorded in the application packet number AP_NS field based on the identification information Null_Flag. The operation of determining and recording the identification information Null_Flag and the information on the number of application packets AP_NS along it will be described in detail with reference to the configuration of the recording system in FIG.

FIG. 6 shows the digital data stream recording method, management information generation and recording format according to the present invention in detail. In order to record the digital stream and the management information in such a format, the streamer 200 converts the digital data transmission packet received from the setup box 100 through the communication interface 210 while attaching a time of arrival (time stamp) to 2048 bytes. Are sequentially recorded in the sector No. without a null data recording area. At this time, the recording stream processing unit 220 divides one application packet into two sectors in the sector boundary area, records them through the optical pickup, and records them in the stream object (S
In the last unit sector belonging to OB), padding is performed with null data if a residual area is generated.

During recording as described above, the control unit 25
0 monitors the received digital stream,
Check the recording space of the sector of the recording medium 230 to be recorded.
However, the currently received packet is recorded as shown in FIG.
There is a remaining area of 130 bytes in the sector to be recorded and one
Smaller than the size of the application packet
The control unit 250 sends an error message to the recording stream processing unit 220.
Provide information about the added capacity, and
Application packet is 130 bytes and 62 bytes
Divide into the last application in the M-2nd sector
Packet AP _M-2# 10 and the M-1st sector
First application packet AP_M-1# 1 and each
Record.

At this time, the control unit 250 determines, for the application header extension information of the (M-2) -th sector,
For ten application packets including the application packet AP _M-2 # 10 divided into 130 bytes, ten application packets, that is, ten bytes of application header extension information are generated and recorded. '00001 corresponding to the value is set in the number field AP_NS.
010 (= 10) 'data is recorded.

On the other hand, in the case of the (M-1) th sector, 62
The first application packet APM-1 # 1 divided into bytes and 10 recorded normally in 192 bytes
Application packets APM-1 # 2 to # 11
, 54 bytes (14 + 14 + 1 + 15) of header information, and 11 bytes of application header extension information generated and recorded corresponding to 11 application packets. Therefore, the sector M-1
Is 2047 bytes after all (= 62 + 1920 + 54 + 11)
Is used as a recording area, and a 1-byte residual area is generated in a sector.

If the size of the remaining area thus generated is the same as the size of one piece of header extension information, that is, if it is 1 byte as in the example, the control unit 250
Generates invalid header data in the following process and causes the recording stream processing unit 220 to record the invalid header data. First, since the control unit 250 uses the entire area of the unit sector of 2048 bytes, the received 192 byte application packet must be divided into 1 byte and 191 bytes and recorded. In this case,
Since the application header extension information for a new one byte corresponding to the application packet recorded by being divided into one byte has to be additionally recorded in the (M-1) th sector, the sector has one byte. Will run short.

Therefore, the control unit 250 controls the recording stream processing unit 220 to record only the 1-byte application header extension information in the (M-1) th sector to fill in the 2048 bytes, The packet is recorded in the Mth sector without being divided.

At this time, the 1-byte application header extension information recorded in the (M-1) -th byte has no application packet corresponding thereto, and therefore, one invalid / invalid identification information flag (Null_Flag) of the header extension information field as invalid header data. )), An identification value 1 indicating that it does not correspond to a valid application packet is recorded. As a result, 11 valid application packets (AP _M-1 # 1, AP _M-1 # 2
This is distinguished from 11 pieces of application header extension information generated corresponding to # 11).

That is, the valid / invalid identification information flag (Null_Fl) of the 11 application header extension information
In ag), an identification value indicating that each application header extended information is valid, 0 is recorded, and in the valid / invalid identification information flag included in the last application header extended information, the application header extended information is valid. An identification value of 1 indicating that this is not the case is recorded.

Therefore, the 1st sector in the M-1 sector is 1
One application packet and twelve application header extension information are recorded, and it can be identified from the valid / invalid identification information that the last application header extension information is simply generated and recorded for padding. A field AP_NS indicating the number of packets recorded in the sector contains the number of 11 application packets recorded in the sector or the number of 11 application header extension information whose validity has been confirmed by identification information. '0000101 which is a value indicating
1 (= 11) 'is recorded.

[0031]

As described above in detail, the digital data stream recording method and the management information generation recording method according to the present invention are such that a 1-byte recording area equal to the size of the application header extension information remains in a unit sector. In this case, the number of application packets actually recorded in one unit sector by inserting and recording invalid header data, which is distinguished from normal application header extension information, before the application packet, and thereby generating By matching the number of application header extension information that is recorded management information, it is possible to prevent the value of the field AP_NS indicating the number of application packets from being inconsistent with the number on one side,
Further, it is possible to prevent an area where no actual data is recorded from being left at the boundary of the sector.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a general digital data stream recording system.

FIG. 2 illustrates a hierarchical diagram for a recording unit of a general digital data stream.

FIG. 3 shows a configuration for general application header information and application header extension information.

FIG. 4 illustrates a conventional digital data stream recording process.

FIG. 5 illustrates recording and configuration of application header information and application header extension information according to the present invention.

FIG. 6 illustrates in detail a digital data stream recording and management information generation process according to the present invention.

[Explanation of symbols]

100: Set-up box 110: Tuning processing unit 120:
Decoders 130, 210: communication interface 140,
250: control units 150, 260: memory 200: streamer 220: recording stream processing unit 230: recording medium (DV
D) 240: read stream processing unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Byung Jin Kim Republic of Korea 463-010 Gyeonggi-do Sangnam Bundang-ku Jeonja-dong 110 110 Hansol Chung Apartment 111-204 ( 72) Inventor Kang Seo Seo Republic of Korea 431-075 Gyeonggi-Dang Yang Yang-Gang-Pyeong-Gang-Dong 897-5 Cho-Won Han Yang Apartment 606-503 (72) Inventor Ki-Won・ Kang South Korea ・ 135-100 ・ SeoulKangnam-Kuk Chundam-Don ・ 15 ・ Daero Villa ・ 1-303

Claims (14)

[Claims] 1. A method of recording a plurality of input packets of a predetermined size in a recording unit having a predetermined unit length, comprising the steps of: determining whether one packet is divided into the next recording unit and recorded; The first step of determining, and the determination of divisional recording, the management information generated corresponding to each packet recorded in the recording unit on a one-to-one basis before both recording units. A second step of generating header information of the recording unit including the recording unit; a third step of comparing the size of a packet recorded in the recording unit with the size of the recording unit; A fourth step of inserting invalid header data into the recording unit so that the correspondence between each packet and each piece of management information does not become inconsistent; and transmitting recognition information for recognizing insertion of invalid header data to the recording unit. Fifth stage and the digital transport stream and a recording method of management information, which comprises a adding records to the header information. 2. In the first step, when one packet is the last packet belonging to one stream object, the remaining area of the recording unit where the packet is recorded is filled with null data and recorded. The method of recording digital transmission streams and management information according to claim 1, wherein the determination is made. 3. When the difference between the sizes compared in the third step is the same as the size of the management information, if the single packet is to be divided and recorded at the boundary of the recording unit, the correspondence between the management information is determined. 2. The digital transmission stream according to claim 1, wherein there is no area to be assigned, and an attempt to record on the next recording unit results in an unrecorded area occurring on the previous recording unit. How to record management information. 4. The method as claimed in claim 1, wherein in the fourth step, the invalid header data is inserted after the area where the management information is recorded and recorded. 5. The method according to claim 1, further comprising, after inserting the invalid header data, recording information on the number of packets of the transmission stream recorded in the determined recording unit in the header area. Recording method of the described digital transmission stream and management information. 6. The number of packets of a transmission stream recorded in the sixth step is the same as the number of management information excluding invalid header data, which is generated and recorded in a recording unit in a one-to-one correspondence. The recording method of a digital transmission stream and management information according to claim 5, characterized in that: 7. A method of recording an input packet of a predetermined size in a recording unit of a predetermined unit length, wherein it is necessary to divide one packet into the next recording unit and record it. And the management information generated in a one-to-one correspondence with each packet recorded in the recording unit before both recording units when the divisional recording is determined. A second step of generating header information of the recording unit, a third step of comparing the size of a packet to be recorded with the size of the recording unit, and a packet generated one-to-one according to the comparison result. A fourth step of inserting invalid header data having the size of the management information into the recording unit, and a fifth step of additionally recording recognition information for recognizing insertion of the invalid header data to the header information of the recording unit. Features include Digital transmission stream and recording method of management information. 8. The first step is that, when a single packet is the last packet belonging to one stream object, the remaining area of the recording unit where the packet is recorded is filled with null data and recorded. 8. The method of recording digital transmission streams and management information according to claim 7, wherein: 9. The method as claimed in claim 7, wherein in the fourth step, the invalid header data is inserted after the area where the management information is recorded and recorded. 10. The method according to claim 7, further comprising: after inserting the invalid header data, recording information on the number of packets of the transmission stream recorded in the determined recording unit in the header area. Recording method of the described digital transmission stream and management information. 11. The number of packets of the transmission stream recorded in the sixth step is the same as the number of management information excluding invalid header data generated in one-to-one correspondence and recorded in the recording unit. The recording method of a digital transmission stream and management information according to claim 10, wherein: 12. An apparatus for recording a digital data stream on a recording medium, receiving means for receiving the packet of the digital data stream while adding its arrival time, and transmitting the packet to which the arrival time is added to a packet of a predetermined size on the recording medium. Recording means for recording such that there is no unrecorded area in the recording unit, and header information including management information generated in one-to-one correspondence with a packet to be recorded. Control means for inserting invalid header data into the generated header information and causing the recording means to record the invalid header data so that the correspondence between each packet and each piece of management information does not become inconsistent. Recording device for management information. 13. The recording means, when one packet is the last packet belonging to one stream object composed of these sets, the remaining area of the recording unit in which the packet is recorded is null. 13. The recording device of digital transmission stream and management information according to claim 12, wherein the recording is performed by filling with data. 14. An apparatus for recording a digital data stream on a recording medium, receiving means for receiving the packet of the digital data stream while adding the arrival time thereof, and transmitting the packet to which the arrival time is added to a packet of a predetermined size on the recording medium. Means for recording so that there is no unrecorded area in the recording unit, and the remaining area of the recording unit when generating header information including management information generated in one-to-one correspondence with packets to be recorded. And a control unit for inserting invalid header data into the generated header information and recording the same in the recording unit when the size is equal to the size of the management information.