KR20000055900A - Method for generating and writing entry points of digital data stream - Google Patents

Abstract

PURPOSE: A method for generating and recording reproduction entrance point information of recording data stream is provided to improve the convenience of a user by automatically generating summary information for indicating a reproduction entrance point to access a specific location of a digital data stream and providing generated summary information. CONSTITUTION: A control unit detects a change of a PID(Packet Identification) value between a program #1 and a program #2(S11) and generates an entry point between the program #1 and the program #2. The control unit records the generated entry point in application management information stored in a management information region(M2) of a memory or records the generated entry point as a part of common management information(S12). A program name to a current recorded data stream is extracted from a broadcasting program service information stored in a broadcasting program information region(M1) of the memory, and the extracted program name is recorded in a recorded information region(S13). An entry point generated by a request of a user is recorded in a recording medium when being requested by the user(S31,S32). The control unit converts a presentation time(PTM) data of a data packet of a corresponding entry point into a text and records the text as summary information of the entry point in an information text region(S33).

Description

Method for generating and writing entry points of digital data stream

According to the present invention, when generating or reproducing entry point information for accessing a specific position of the digital data stream when recording or reproducing the digital data stream on a recording medium, the schematic information is generated so as to facilitate identification thereof. The present invention relates to a method of generating and recording reproduction point information of a recording data stream recorded on a recording medium in association with the reproduction point information.

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 rapidly progressing, and existing terrestrial, satellite, and cable broadcasting are based on MPEG (Moving Picture Experts Group) method. It is digitizing.

According to the development of digital video / audio compression technology and digital transmission technology, the digital broadcasting can provide a higher quality service than the 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 the MPEG scheme are multiplexed and transmitted in a transport stream (TS), which is received by a set top box installed on the receiving side. The multiple broadcast programs included in the transport stream are demultiplexed so that only one desired broadcast program is selected, and the original audio and video signal is decoded by a decoder built into the set-top box for the selected broadcast program. To the same A / V output device.

In addition to receiving such digital broadcast signals and outputting them to an A / V output device such as a television, a research into a system for storing, editing, and reproducing the received broadcast signals in a storage medium has been conducted. After receiving a digital data stream such as a digital broadcast signal from a set-top box, and storing it in a streamer such as a digital video disc (DVD) recording / reproducing apparatus through a communication interface such as an IEEE1394 serial bus, the stored digital Research into a system capable of reproducing digital audio and video through an AV output device such as a television by editing and reproducing a data stream and delivering the communication interface to the set-top box via media is provided.

In the above-described system, entry points, which are reproduction entry point information for accessing the recording position of a specific data stream unit among digital data streams such as the digital broadcast program, are provided in two forms depending on whether text is input. When there is no text input for the set entry point, as shown in FIG. 1, only the presentation time (PTM) information of the corresponding type and the designated data packet is present, and when the text is input from the user. As shown in FIG. 2, the type and PTM information, and the information that indexes the location where the text content is stored are divided and managed.

However, in the system having the above-mentioned reproduction entry point information, since the keyboard for text input must be provided in the system for text input of the user, not only a problem of increasing the volume and cost of the device occurs, Even if a keyboard for text input is provided, it is very cumbersome for the user to input descriptive text by keying every time an entry point is specified.

Accordingly, the present invention has been created to solve the above problems, and automatically generates schematic information on reproduction entry point information for accessing a specific position of a digital data stream, thereby recording a specific broadcast program recorded on a recording medium. It is an object of the present invention to provide a method of generating and recording reproduction point information of a recording data stream, wherein the selection and reproduction thereof can be performed quickly based on the outline information.

1 and 2 illustrate the form of reproduction entry point information (entry point) according to the presence or absence of text information;

FIG. 3 schematically shows a system to which a reproduction entry point information generation and recording method of a recording data stream according to the present invention is applied;

4 is a diagram illustrating a configuration of a received digital broadcast program stream.

Fig. 5 shows the flow of a preferred embodiment of the reproduction entry point information generation and recording method of the recording data stream according to the present invention;

6 exemplarily shows a position of generating an entry point for each broadcast program (PG),

Fig. 7 shows a detailed format of program reproduction connection (PGC: Program Chain) information recorded in a specific area of the optical disc.

※ Explanation of code for main part of drawing

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

120: decoder 130, 210: 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

A digital data stream recording method according to the present invention for achieving the above object comprises the steps of: generating reproduction entry point information for accessing an arbitrary position of the recorded digital data stream; A second step of extracting and generating schematic information on the arbitrary reproduction entry point information from predetermined information received together with the digital data stream; And a third step of recording the generated schematic information on the recording medium in association with the reproduction entry point information.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the reproduction entry point information generation recording method of a recording data stream according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 schematically shows an embodiment of a system to which a method for generating and recording reproduction point information of a recording data stream according to the present invention can be applied. The system includes a set-top box 100, a communication interface (IEEE1394), and a switch. It consists of a streamer 200.

The set-top box 100 receives a transport stream (TS) multiplexed by a plurality of broadcast programs encoded by a system encoder from a broadcasting station, and demultiplexes the transport stream (TS) according to a user's request. The decoding stream for the broadcast program tuned by the channel selection processing unit 110 is decoded by the system decoder 120 and output through a AV set such as a television.

In the set-top box 100, the decoder 120 decodes the broadcast program service information included in the transport stream for the broadcast program tuned by the channel selection processing unit 110 and transmits it to the control unit 140 by decoding the broadcast program service information. 140 stores the broadcast program service information in the broadcast program information area M1 of the memory 150. The broadcast program service information may include broadcast program information of all broadcast programs of all received channels. In the broadcast program service information (SI), a transmission channel number, a channel name, a broadcast program name, a schedule, each Program category information of a broadcast program, attribute information of streams constituting each broadcast program, and a viewing grade of each broadcast program may be included.

The control unit 140 of the set-top box 100 forms a broadcast program table having a time axis and a channel axis by using broadcast program service information stored in the broadcast program information area M1 of the memory 150 at the request of a user. Control to display on the screen.

The set-top box 100 transmits the broadcast program tuned at the request of the user to the streamer 200 via the IEEE1394 communication interface 130 or 210, and transmits the broadcast program by the streamer 200 to the digital video disc. Recording on a recording medium 230 such as a DVD.

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 set-top box 100 and the streamer 200 need to know management control information of the broadcast programs recorded on the recording medium in order to play respective roles in recording and reproducing the broadcast programs. Therefore, in the above system, "application management information" which is recording broadcast program management control information used only by the set-top box 100, "streamer management information" which is recording broadcast program management control information used only by the streamer 200, And "common management information" which is recording program management control information that can be shared between the set-top box 100 and the streamer 200, and is used to manage broadcast programs recorded on a recording medium. The file is recorded on the recording medium 230 of the streamer 200.

On the other hand, application management information, streamer management information, and common management information, which are management control information of broadcast programs recorded on the recording medium, are divided into individual files and stored on the recording medium or in one file. May be stored in three divided areas ("application management information area", "streamer management information area", and "common management information area").

The application management information is read by the read stream processing unit 240 of the streamer 200 at the time of initial driving of the set-top box 100 or by request of the set-top box, and transmitted to the set-top box 100 via the IEEE 1394 communication interface. The management information for the broadcast program, which is stored in the management information area M2 of the memory 150 by the control unit 140 of the set-top box 100, and is newly recorded at the time of recording the broadcast program by the user's request, is displayed. It is added by the control unit 140 and updated. In addition, when the recorded broadcast program is reproduced by a user request, the controller 140 makes a request for playback to the streamer 200 using management information of application management information. The application management information stored in the memory 150 is read at the end of the recording operation or the power-off operation of the set-top box and transmitted to the streamer 200 via a communication interface to control the control unit 250 of the streamer 200. According to the control, the data is recorded on the recording medium 230 by the storage stream processor 220.

The streamer management information and the common management information are read by the read stream processing unit 240 of the set-top box 200 at the initial operation of the streamer 200 and the memory 250 is controlled by the controller 250 of the streamer 200. The management information for the newly recorded broadcast program at the time of recording the broadcast program by the user's request is added by the control unit 250 and updated and recorded. In addition, when the recording broadcast program is reproduced by a user request, the control unit 250 broadcasts stored in the recording medium 230 using management information of streamer management information according to a reproduction request signal from the set-top box 100. Program playback will be performed. The streamer management information and the common management information stored in the memory 260 are read out at the end of the write operation or the power-off operation of the streamer 200, and are read to the storage stream processor 220 under the control of the controller 250. Is recorded on the recording medium 230.

As shown in Fig. 4, the transmission packet of the broadcast program stream includes an 8-bit sync byte, an error indication indicating the presence or absence of a bit error of the packet, and packet identification information indicating an attribute of data in a payload. (PID), a packet header including an adaptation field into which additional information on the payload can be optionally inserted, and the payload. The adaptation field includes a random access indicator indicating the start of the sequence header of the video to indicate an entry point for random access. In addition, the packet identification information (PID) present in each of the two programs included in the program stream selected by the channel selection processing unit 110 has a value that can be distinguished from each other.

Next, the structure of the recording data management file generated in accordance with the recording of the received digital data stream and the configuration of the recording data will be described.

Application management information (application.IFO) includes a table of contents (TOC) in which entry points, which are randomly accessible information about a recorded data stream, are recorded, and service information (Service) in which information about the recorded data stream is recorded. Manage information (SI) tables. The entry point is recorded using information of a transport packet layer (TS packet layer) such as packet identification information (PID) and random access indicator information included in the transport stream of the data stream, or at a broadcast station. It may be recorded using the service information (SI) recorded by selecting and sorting from the broadcast program service information that is transmitted, or may be recorded by user's location designation. Here, the entry point may be recorded in the application management information as described above or in the common management information.

The common management information (common. IFO) is an original playlist which is automatically generated as the data stream is recorded, the reproduction order information (Cell) for the recorded data stream, and the reproduction order for the recorded data stream. Manage user defined playlists created as you edit.

The streamer management information (streamer.IFO) is for managing a mapping list, which is an address for a stream object unit (SOBU) recorded on a recording medium. The mapping list consists of a plurality of maps MAP1, MAP2, .... The maps correspond one-to-one with the playback order information cells included in the original playlist, respectively, and the playback order information cells included in the user defined playlist are one-to-one with the map. Correspond to or correspond to a portion of the map. Each map includes a stream recording unit SOBU accumulated address and a stream recording unit address SOBU address, and the SOBU accumulation address is, for example, the first stream recording unit of the map every 10 seconds. From the position of the SOBU, the cumulative relative positions ACC_SZ are formed, and the stream recording unit SOBU address is composed of, for example, the SOBU size SOBU_SZ in units of 0.5 seconds. That is, the mapping list is configured to be accessible in units of 0.5 seconds, for example. In addition, the initial position SOB_OFF_ADDR information of the stream recording assembly SOB corresponding to each map is also required. In this case, a program clock reference (PCR), a packet arrival time (PAT), a presentation time stamp (PTS), or the like may be used as the reference time.

The streamer record management file (streamer.SOB) is an SOB / SOBU layer that manages a stream record SOB corresponding to the map MAP and a stream record unit SOBU corresponding to the SOBU size SOBU_SZ. A sector layer for managing a plurality of sectors (Sector1 to Sectork) on a recording medium recorded in the SOBU unit, and a transport stream packet layer for managing transport stream packets TS Pkt1 to TS Pkt k in each sector unit. It is to manage.

FIG. 5 is a flow chart showing a preferred embodiment of the reproduction entry point information generation recording method of the recording data stream according to the present invention. Referring to FIG. 3, the reproduction point information generation method of FIG. This will be described in detail.

First, when a user request to record a digital data stream such as a digital broadcast signal selected and input by the channel selection processing unit 110 on a recording medium is input, the control unit 140 of the set-top box 100 is the IEEE1394 communication interface (130,210). In addition to notifying the control unit 250 of the streamer 200 that the current recording mode is set, the received stream is transmitted to the streamer 200 through the communication interfaces 130 and 210, and thus the streamer ( It is to be recorded on the recording medium 230 in the 200 (S1).

At the same time, the control unit 140 of the set-top box 100 uses the packet identification information (PID) included in the transmission packet of the data stream to access playback point information (hereinafter, 'entry') for accessing a specific location of the data stream. Point '(entry point)), the control unit 140 of the set-top box 100 continuously checks the PID of the packet decoded by the system decoder 120, the value is It is confirmed whether the change (S2). Here, since the PID value is set to a value that can be distinguished from each other in different programs, it is easy to distinguish between programs.

As described above, in a state in which a program and a PID of a program are being transmitted as a distinguishable value, the controller 140 changes the PID value between the program # 1 (PG # 1) and the program # 2 (PG # 2). Is detected (S11), an entry point (a in FIG. 6) is generated between program # 1 (PG # 1) and program # 2 (PG # 2) as shown in FIG.

In addition, the controller 140 records the entry point generated between the program and the program in the application management information (application.IFO) stored in the management information area M2 of the memory 150 as described above, or common management information. can be recorded as a part of the playlist of common.IFO (S12), and is also recorded in the data stream currently recorded in the broadcast program service information SI recorded in the broadcast program information area M1 of the memory 150. The program name is extracted and recorded as the schematic information in the format of FIG. 2 in the recorded information area, and the types thereof are separately recorded (S13).

In addition, at the time of user's request at the time of recording (or playback) (S31), the same entry point is generated. In this case, the entry point for the digital data stream corresponding to the point selected by the user is generated ( As shown in FIG. 6B), as described above, the entry point generated by the user's request is also recorded on the recording medium 230 (S32).

At this time, the control unit 140 textizes the presentation time (PTM) data of the data packet of the entry point, records it in the information text area as outline information of the entry point (S33), and indexes it. Information is recorded in the IT_TXT_N field, and the type of the entry point in which the PTM text is recorded is a type code for distinguishing the type code from the aforementioned entry point in which the general program description text is recorded as the outline information, such as a broadcast program name. Will be recorded on

By repeating the above operation until the recording mode is terminated by the user (S21), the controller 140 switches between the program # 2 (PG # 2) and the program # 3 (PG # 3), and the program. When the change of the PID value between the # 3 (PG # 3) and the program # 4 (PG # 4) is confirmed, the schematic information of the entry point and the text is generated at the position and stored on the recording medium 230. When the user ends the recording request, the recording operation is terminated.

On the other hand, in the recording mode together with the above-described creation and operation of the entry point, the storage medium processor 220 stores the data stream input by the control unit 250 of the streamer 200 through the IEEE 1394 communication interface 130 or 210. In this case, the control unit 230 divides the recorded data stream in units of 0.5 seconds by using the time reference information included in the transport stream packet of the input data stream. The SOBU size SOBU_SZ corresponding to the generated stream recording unit SOBU and generating stream management information (streamer.IFO) stored in the memory 26. Write to SOBU address table. When the stream recording unit SOBU recorded by repeating the above operation is, for example, 20 units and the recording time is 10 seconds, for example, the accumulated size ACC_SZ is generated to generate the accumulated size ACC_SZ. The streamer management information (streamer.IFO) stored in the memory 26 is recorded in the SOBU cumulative address table.

The controller 250 of the streamer 200 continues the above operation until the recording mode ends, and the unit of the stream recorded once is the record RCD. When the recording mode is performed as described above, the controller 250 of the streamer 200 divides the recorded set of stream recording units SOBU into one stream recording unit SOB, and records the recording stream. When finished, the recorded set of accumulated size (ACC_SZ) and SOBU size (SOBU_SZ) is divided into one map and recorded in the streamer management information (streamer.IFO).

Subsequently, the controller 250 of the streamer 200 reproduces the connection sequence and structure of FIG. 7 having information on the entry point generated in the above-described manner with respect to the map MAP1 partitioned as described above. The information Cell 1 is configured and recorded as reproduction order information corresponding to the record RCD1 of the original reproduction connection information O_PGC in the reproduction order information area (Cell layer) of the common management information (common, IFO).

The control unit 140 of the set-top box 100 and the control unit 250 of the streamer 200 also perform a recording operation in the same manner as above.

After the completion of the recording of the digital data stream as described above, when the user selects and plays the playback connection unit generated and recorded as described above, the control unit 140 records the entry point in the cell information in the playback connection unit. By reading the outline information of the text in sequence to configure the data to be displayed on the screen of the external video device (TV) to transmit to the set-top box 100, the user on the recording medium 230 through the outline information With respect to the recorded broadcast program and the selected playback entry point, it is possible to more easily identify the desired playback position.

In addition, the present invention is not limited to the system described with reference to FIG. A digital broadcasting program is also provided in a system configured to perform a function such as the set-top box and a device that perform a function such as the streamer in a set, and to communicate with each other via an internal bus. The present invention can also be applied when receiving and storing.

The recording and reproducing point information generation recording method of the recording data stream according to the present invention as described above is provided by automatically generating and providing schematic information at the time of recording or reproducing, at which the recording and reproducing point for accessing a specific position of the digital data stream is provided. In addition, it is a very useful invention that improves the user's convenience by making it easy to find a desired playback start position without errors in a recording program bundled in a single playback connection unit through the above schematic information.

Claims (4)

A method of recording a digital data stream on a record carrier, the method comprising: A first step of generating reproduction entry point information for accessing an arbitrary position of the recorded digital data stream; A second step of extracting and generating schematic information on the arbitrary reproduction entry point information from predetermined information received together with the digital data stream; And And a third step of recording the generated schematic information on the recording medium in association with the reproduction entry point information. The method of claim 1, In the first step, reproduction entry point information generation and recording method of a recording data stream, wherein reproduction entry point information is generated at a position classified by program classification information among predetermined information received together with the digital data stream. . The method of claim 1, And the outline information indicates a broadcast program name among predetermined information received together with the digital data stream. The method of claim 1, And wherein the third step records type information for discriminating the method of generating the outline information on a recording medium in association with the reproduction entry point information.