KR100538857B1 - Management Information Generation and Recording Method for Recorded Digital Data Streams - Google Patents

Abstract

According to the present invention, when the received data stream is divided and recorded into a recording unit of a certain size, or when the recorded recording unit is deleted and edited, recording digital data for generating and recording management information for identifying a change in the recording size of the recording unit accordingly. A method for generating and recording management information of a stream, the method comprising: dividing an input data stream into recording units having a predetermined size; And detecting the recording position information spaced apart from the display position of the unit time indicating the predetermined time interval of the data stream and recording size information spaced apart from the boundary of the partitioned recording unit. And dividing the information into spaces separated from the display position of the unit time indicating the predetermined time interval of the data stream by the boundary of the partitioned recording unit, and additionally recording the information into the management information of the recording aggregate composed of the recording unit. As a result, it is possible to accurately identify and manage the change in the recording size of the partitioned recording unit or recording assembly, and to perform the correct operation by the management information in the subsequent recording / reproducing or editing operation.

Description

Method of generating and recording management information of a recorded digital data stream.

According to the present invention, when the received data stream is divided into recording units of a certain size or when the recorded recording units are deleted and edited, the recording digital for generating and recording management information for identifying the change in the recording size of the recording units accordingly is recorded. A method of generating and recording management information of a data stream.

In the conventional analog television broadcasting, a video signal to be transmitted is modulated by AM or FM and transmitted through radio waves or cables. Recently, with the development of digital technologies such as digital image compression and digital modulation and demodulation, the standardization of digital television broadcasting is advancing at a rapid pace, and digitalization based on MPEG (Moving Picture Experts Group) is also used in conventional terrestrial, satellite, and cable broadcasting. Doing.

According to the development of digital video / audio compression technology and digital transmission technology, the digital broadcasting can provide higher quality service than analog service, and can transmit a plurality of broadcast programs in the same bandwidth, and use digital communication media and digital storage media. Has the advantage of increasing interoperability.

In such digital broadcasting, a plurality of broadcast programs encoded on the basis of MPEG are multiplexed and transmitted in the form of a transport stream (TS), which is received by a set top box or the like installed on the receiving side. A plurality of broadcast programs included in the transport stream are demultiplexed so that only one desired broadcast program is selected. The selected broadcast program is decoded by a decoder built into the set-top box to decode the original audio and video signal such as a television. It is delivered to A / V output device.

FIG. 1 schematically illustrates a conventional digital data stream recording system. The system includes a set top box 100, a communication interface (IEEE 1394), and a streamer 200. The set top box 100 Receives and demultiplexes a transport stream (TS) multiplexed by a system encoder multiplexed by a system encoder from a broadcasting station, and tunes in the channel selection unit 110 by the control unit 140 at the user's request. The stream stream for the broadcast program is decoded by the system decoder 120 to be output through an AV set such as a television, or the broadcaster tuned at the request of the user through the IEEE 1394 communication interface 130 or 210 as a streamer 200. To record the broadcast program to a recording medium 230 such as a digital video disc (DVD). have.

In addition, the set-top box 100 receives a broadcast program read from the recording medium 230 by the streamer 200 in response to a user's request via the IEEE1394 communication interface 210 or 130 and decodes it in the decoder 120. The broadcast program can be reproduced by outputting to a television set.

As described above, the system for receiving digital broadcast signals and outputting them to an A / V output device such as a television, as well as storing, editing, and playing the received broadcast signals on a storage medium is currently under development. How to partition and record the Stream OBject (SOBU, or Mapping Unit: MAPU, hereinafter referred to as MAPU), which is the minimum recording unit for digital data streams, on the recording medium. Since the record unit division method and management information generation recording method of how to manage the data are not standardized, methods independently researched and developed about the partition method of the recording unit (MAPU) and the management information generation recording method are related. It is being proposed one after another by companies.

Hereinafter, a method of dividing the recording unit proposed by the related companies will be described in detail with reference to FIGS. 2 and 3.

First, FIG. 2 is a diagram illustrating the proposed conventional digital data stream recording and recording unit partitioning operation, and FIG. 3 shows management information according to the proposed conventional recording unit partitioning operation. As shown in FIG. The received data stream is counted at regular time intervals (e.g. X = 25.1 ms), and after a certain time (aX (i + N), a = integer), after the previously partitioned recording unit (MAPU N-1) The amount of data streams recorded in the A + B + C area, i.e., 32 sectors or more, for example, 32 sectors or more. In this case, 32 sectors (A + B) recorded in the A + B area are partitioned into one recording unit (MAPU N), or when the counted sector number is 32 sectors, then the recording unit is partitioned until then. Generate and record counted predetermined time interval information as management information. In other words, there does not include the sectors of the C region aX (i + N) of the recording unit (MAPU N) in the compartment.

On the other hand, the management information for the recording unit (MAPU) partitioned as described above and the recording assembly (MAP) consisting of the recording units, is generated as shown in Figure 3 and recorded on the recording medium, the recording program (Program) Stream time map information (STMAPI: Stream Time Map Information) generated in units is divided into stream time map general information (STMAP_GI: Stream Time Map General Information) and a mapping list (MAPL: Mapping List). The information (STMAP_GI) is again the size of the recording unit (MAPU) (MAPU_SZ) field, the mapping unit time shift value (MTU_SHFT) field, the reserved area (Reserved) field, the mapping list entry number (MAPL_ENT_Ns) field, the start packet arrival time ( S_S_APAT) field and the last packet arrival time (S_E_APAT) field, while the mapping list (MAPL) is composed of packet arrival time increase information (IAPAT: Incremental Application Packet Arrival Time) field.

Therefore, as shown in FIG. 2, the number of sectors (A + B = 32 sectors) of the recording unit MAPU N partitioned and the number of sectors detected at the partition time aX (i + N) (A + B + C>). 32 sectors), that is, information on sectors in the C region cannot be generated and managed, and thus, when the editing operation is performed after the end of the data stream recording, for example, when the deleting operation is performed, the deletion and management are not performed correctly. In the data stream deleting operation, the data stream deleting operation is performed in units of the recording unit (MAPU) shown in FIG. 2 based on the packet arrival time increase information (IAPAT), and based on the deleted recording unit (MAPU). Record sets (MAPs) are generated separately. For example, when the N recording units (MAPU N) are deleted, the sectors actually deleted are not A + B areas of the N recording units (MAPUs), but aX (i + N) in aX (i), which is a predetermined time interval unit area. Sectors corresponding to the B + C region are deleted.

In addition, the M 'recording aggregate (MAP M') generated accordingly has an N-1 recording unit (MAPU) as the last recording unit (MAPU). The M '+ 1 recording aggregate (MAP M' + 1), which is not separately generated, also has an N + 1 recording unit (MAPU) as the first recording unit (MAPU). Information on sectors is also not generated separately so that the management of the undeleted A area and the deleted C area cannot be performed.

Therefore, there is a problem that it is impossible to perform the correct operation corresponding to the recording / reproducing operation or the editing operation.

Therefore, the present invention was created to solve the above problems, and divides the received data stream into recording units of a predetermined size, and the unit time in which the boundaries of the partitioned recording units indicate a predetermined time interval of the data stream. By detecting and generating information spaced apart from the display position of the display unit, and additionally recording the information into the management information of the recording aggregate composed of the recording unit, and matching the partitioning recording unit or the recording aggregate with the management information managing the same to ensure accurate recording / reproduction or SUMMARY OF THE INVENTION An object of the present invention is to provide a method for generating and recording management information of a recordable digital data stream for performing an editing operation.

According to an aspect of the present invention, there is provided a method of generating and recording management information of a recording digital data stream, the method comprising: dividing an input data stream into recording units having a predetermined size; And detecting, by the boundary of the partitioned recording unit, the recording position of the unit time indicating the predetermined time interval of the data stream and recording size information spaced apart from each other.

In addition, the management information generation and recording method of the recording digital data stream according to the present invention comprises the steps of: detecting the recording size of the data stream to be recorded at predetermined time intervals; Dividing a recording unit having a predetermined size according to the detection result; And generating and recording information on the remaining size not partitioned into the recording unit at the recording size at the time of detection of the first step as management information on the recording unit partitioned thereafter.

In addition, the management information generation and recording method of the recording digital data stream according to the present invention comprises the steps of: deleting the recording unit of the recorded data stream; Separating and generating management information of the recording aggregate before and after the deleted recording unit; And updating the recording size information for the specific recording unit in each of the separately generated management information.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a management information generation recording method of a recording digital data stream according to the present invention will be described in detail with reference to the accompanying drawings.

First, a digital data stream recording and management information generating method according to the present invention will be described in detail with reference to FIGS. 4, 6, 7 and 8. First, the controller 250 of the streamer 200 shown in FIG. 1 records a data stream received from the set-top box 100 on a recording medium such as a DVD as a recording unit (MAPU). When the recording mode is set as shown in FIG. 7 (S10), the received data stream is recorded on the recording medium (S11), and the recording size of the recorded data stream, that is, the number of sectors and the recording time, are counted (S12). Thereafter, when the counted time TC coincides with a predetermined time interval aX (S13), if the number of sectors recorded is a certain number of sectors, for example, when 32 sectors or more are detected (S14), the recorded sectors ( 32 sectors among the 32 sectors or more) are divided into one recording unit (MAPU) (S15).

For example, the partitioned recording unit (MAPU), the N recording unit (MAPU N) is a predetermined time interval (aX (i + N) after the N-1 recording unit (MAPU N-1) previously recorded as shown in FIG. Are sectors recorded up to), that is, sectors corresponding to the A + B area. That is, the area C of the sector B + C recorded during the predetermined time interval aX (i) to aX (i + N) is excluded, and instead, the previously recorded N-1 recording unit (MAPU N-1) In the partitioning unit (aX (i)), the sectors of the excluded area A are summed so that the 32-sector recording unit MAPU N is partitioned.

Subsequently, offset size (OFFSET_SZ) information for managing the number of sectors corresponding to the C area excluded from the N recording unit (MAPU N) section is additionally recorded in the recording unit entry (MAPU_ENT) information field (S16).

The offset size (OFFSET_SZ) information to be additionally recorded is information corresponding to the number of sectors in the area A in the case of partitioning the N-1 recording unit (MAPU N-1), and in the case of the partitioning of the N recording unit (MAPU N). The offset size (OFFSET_SZ) information includes at least one predetermined time interval (aX, X = 25.1ms) during recording of 32 sectors required for the recording unit (MAPU) partition. , X is 'unit time' indicating the interval of time.) Since the offset size, that is, the number of sectors, exists up to 31 sectors depending on the transmission speed of the data stream to be transmitted, the offset size ( In the case of additional recording with OFFSET_SZ) information, a field of 1 byte may be used, and if the offset size (OFFSET_SZ) information amount is to be simplified to 4 bits, the predetermined time interval aX is shortened to 1/2 ( X '= 25 / 2ms) in the C region Since the maximum number of sectors is 1/2 of 31 sectors so as not to exceed the maximum of 16 sectors, the offset size OFFSET_SZ can be represented by all four bits.

Meanwhile, the offset size (OFFSET_SZ) information generated as described above is additionally recorded in the recording unit entry (MAPU_ENT) information as shown in FIG. 6, and the recording unit entry (MAPU_ENT) information has been described with reference to FIG. 3. In addition to the packet arrival time increase information IAPAT, the offset size (OFFSET_SZ) information field is included. FIG. 6 illustrates an embodiment in which offset size (OFFSET_SZ) information is generated and recorded using 4 bits.

Further, the size of the offset size (OFFSET_SZ) information field, that is, the size of the offset size (SZ_OFFSET_SZ), which is management information for identifying whether the offset size (OFFSET_SZ) information is generated and recorded by using a bit or how many bytes, FIG. 6 shows an example in which an additional size of one byte is recorded in the stream time map general information (STMAP_GI) described with reference to FIG. 3. For reference, when the size of the offset size (OFFSET_SZ) information is fixed, for example, if it is fixed to 4 bits, it is not necessary to record the size (SZ_OFFSET_SZ) information of the offset size as described above.

On the other hand, when the recording end request for terminating the recording operation is input after the offset size (OFFSET_SZ) information generation recording, the data stream recording and management information generation recording operation is terminated (S17).

8 is a flowchart illustrating another digital data stream recording and management information generation recording method according to the present invention. When the recording mode is set as described above (S50), the received data stream is recorded on the recording medium. In S51, the recording size of the data stream to be recorded, that is, the number of sectors and the recording time, is counted (S52). Thereafter, when the number of sectors counted is a constant (N) sector, for example, 32 sectors (S53), 32 sectors are divided into recording unit MAPU (S54), and the number of sectors thereafter is continuously counted (S55). When the time TC coincides with a predetermined time interval aX (S56), the number of sectors SC counted after the partition of the recording unit MAPU is temporarily stored as offset size (OFFSET_SZ) information (S57), and then again. Additional recording (S58) is performed using offset size (OFFSET_SZ) information of the partitioning recording unit MAPU.

On the other hand, when the recording end request for terminating the recording operation is input after the offset size (OFFSET_SZ) information generation recording, the data stream recording and management information generation recording operation ends (S59).

Accordingly, the digital data stream received from the set-top box 100 is partitioned and recorded on a recording medium in units of recording units (MAPU), and according to the management information, in particular, the number of sectors recorded and recording units for a predetermined time interval. Offset size (OFFSET_SZ) information is generated and recorded as difference information between sector numbers.

Hereinafter, a method of deleting recorded digital data streams and generating management information according to the present invention will be described in detail with reference to FIGS. 5, 6, and 9. In the recording data stream deleting operation, when a command for deleting a data stream recorded in recording unit (MAPU) units on a record is input to the control unit 250 of the streamer 200 as shown in FIG. The requested area is detected based on packet arrival time increase information IAPAT in the recording unit entry (MAPU) information shown in FIG. 6 (S31). For example, aX (i) in aX (i) of FIG. The B + C area up to i + N) is detected, and the sectors corresponding to the B + C area are deleted. That is, the sectors corresponding to the area B of the N recording unit MAPU N and the sectors corresponding to the area C of the N + 1 recording unit MAPU N + 1 are divided and deleted (S32).

Thereafter, the M 'recording assembly in which the M recording assembly MAP M, which is the recording assembly MAP before the erasing operation, is the two recording assemblies, that is, the last recording unit MAPU is the N-1 recording unit MAPU N-1. (MAP M ') and the first recording unit (MAPU) are separated (S33) into an M' + 1 recording assembly (MAP M '+ 1) having N + 1 recording units (MAPU N + 1). During the recording operation, the offset size (OFFSET_SZ) information additionally recorded in the recording unit entry (MAPU) information is detected to determine whether the offset size (OFFSET_SZ) is 0 (S35). The last recording unit size (END_MAPU_SZ) information, which is management information indicating that the last recording unit MAPU N-1 of the aggregate MAP M 'is the recording size of 32 sectors and the number of sectors corresponding to the area A, is generated, and FIG. As shown in Fig. 6, additional update recording (S36) is performed in the stream time map general information (STMAP_GI).

In addition, the first recording unit (MAPU N + 1) of the separated M '+ 1 recording assembly (MAP M + 1) is the start recording which is management information indicating that the recording size is subtracted the number of sectors corresponding to the C region in 32 sectors. The unit size (START_MAPU_SZ) information is generated and additionally updated and recorded (S37) in the stream time map general information (STMAP_GI) as shown in FIG.

On the other hand, as a result of the determination (S35), when the offset size (OFFSET_SZ) is 0, the last of each of the separated M 'recording assembly MAP M' and M '+ 1 recording assembly MAP M' + 1 The last recording unit size (END_MAPU_SZ) information and the starting recording unit size (START_MAPU_SZ) information, which are the size information for the recording unit MAPU N-1 and the first recording unit MAPU N + 1, are maintained.

FIG. 6 is a diagram illustrating management information according to the present invention, and stream time map information (STMAPI: Stream Time Map Information) generated in a recording program unit, as shown in FIG. (STMAP_GI: Stream Time Map General Information) and Mapping List (MAPL). The stream time map general information (STMAP_GI) is again a size (MAPU_SZ) field of a recording unit (MAPU), and a mapping unit time shift. A value (MTU_SHFT) field, a reserved area, a mapping list entry count (MAPL_ENT_Ns) field, a start packet arrival time (S_S_APAT) field, a last packet arrival time (S_E_APAT) field, and an offset size additionally recorded by the present invention. The size (SZ_OFFSET_SZ) field, the last recording unit size (END_MAPU_SZ) field, and the starting recording unit size (START_MAPU_SZ) field are added.

Meanwhile, the mapping list MAPL includes recording unit entry (MAPU_ENT) fields including an Incremental Application Packet Arrival Time (IAPAT) field and an offset size (OFFSET_SZ) field.

When the received data stream is recorded or when the recorded data stream is edited, the offset size (OFFSET_SZ), the size of the offset size (SZ_OFFSET_SZ), the last recording unit size (END_MAPU_SZ) and the starting recording unit size (START_MAPU_SZ) information are separately provided. By additional recording, accurate management information on the change in the recording size of the recording unit MAPU or the recording aggregate MAP is generated and recorded. Subsequently, accurate recording is performed by the generated management information during the recording / reproducing or editing operation. This will be done.

In the recording digital data stream management information generation and recording method according to the present invention, the received data stream is divided into recording units having a predetermined size, and the boundaries of the partitioned recording units indicate a predetermined time interval of the data stream. By detecting and generating the information spaced apart from the display position of the unit time, and additionally recording the information in the management information of the recording assembly composed of the recording unit, it is possible to accurately identify and manage the change in the recording size of the divided recording unit or the recording assembly. Of course, it is a very useful invention to perform the correct operation by the management information during the recording / playback operation or editing operation.

1 schematically illustrates a conventional digital data stream recording system,

2 is a diagram illustrating a conventional digital data stream recording and recording unit partitioning operation.

3 shows management information according to a conventional recording unit section,

4 is a diagram illustrating the digital data stream recording and recording unit partitioning operation of the present invention;

5 is a diagram illustrating a recording unit deleting operation of the present invention;

6 illustrates management information according to a recording unit partitioning operation and a deleting operation according to the present invention;

7 is a flowchart illustrating an operation of a digital data stream recording and management information generation recording method according to the present invention;

8 is a flowchart illustrating another digital data stream recording and management information generation and recording method according to the present invention;

9 is a flowchart illustrating an operation of recording and deleting digital data streams and management information generation according to the present invention.

※ Explanation of code for main part of drawing

100: set-top box 110: station selection processing unit

120: decoder 130210: communication interface

140,250: control unit 150,260: memory

200: streamer 220: storage stream processing unit

230: recording medium (DVD) 240: read stream processing unit

Claims (12)

Dividing the input data stream into recording units having a predetermined size; And Management information of the recorded digital data stream, characterized in that the boundary of the divided recording unit comprises detecting and recording the display position of the unit time indicating the predetermined time interval of the data stream and the recording size information spaced apart from the recording unit; Generation recording method. The method of claim 1, And the recording size information is a number of sectors corresponding to the spaced amount of data. The method of claim 1, And the number of recording bits of the spaced recording size information is varied according to the size of the unit time. The method of claim 3, wherein And the information on the number of recording bits of the recording size information is additionally recorded in the management information of the recording aggregate composed of the recording unit. Detecting a recording size of a data stream to be recorded at predetermined time intervals; Dividing a recording unit having a predetermined size according to the detection result; And And recording and generating information on the remaining size not partitioned into the recording unit at the recording size at the time of detection of the first stage as management information on the recording unit partitioned thereafter. Method of generating and recording management information of a stream. Deleting a recording unit of the recorded data stream; Separating and generating management information of the recording aggregate before and after the deleted recording unit; And And updating the recording size information for a specific recording unit in each of the separately generated management information. The method of claim 6, Wherein the specific recording unit is the last recording unit of the recording assembly corresponding to the separately generated management information, and the starting recording unit of the recording assembly corresponding to the separately generated management information. How to record management information. The method of claim 7, wherein And the size of the last recording unit is updated and recorded to the sum of the number of some sectors of the deleted recording unit. The method of claim 7, wherein And the start recording unit is updated in size by subtracting some sectors of the deleted recording unit. The method of claim 6, And the first step of partially deleting the recording unit requested to be deleted. The method of claim 10, And the partial erasing of the recording unit requested to be deleted comprises deleting an area in which the recording unit excludes an area spaced apart from the display position of a unit time. Dividing the recorded data stream into recording units having a predetermined size; Detecting an elapsed time of a unit time periodically generated and displayed in the data stream; Detecting and storing a recording size of a data stream recorded between the partition time of the first step and the detection time of the second step; And And recording the stored recording size into management information on a size of a recording unit to be partitioned next.