KR100329229B1 - How to create playlist - Google Patents

Abstract

The present invention relates to a play list generating method for generating a play list of a stored digital broadcast program stream when receiving a digital broadcast program stream and storing the same on a recording medium such as a digital video disc. By detecting and using the detected PID, an entry point (playback entry information) is recorded, and a playlist is automatically generated using this recorded entry point. The present invention also detects the PID and the random access indication included in the broadcast program stream, records the entry point using the recorded entry point, and randomly accesses the recorded program stream using the recorded entry point to record the image on the screen. Create a playlist while checking the contents of the program.

Description

How to create a playlist

The present invention relates to a play list generating method for generating a play list of a stored digital broadcast program stream when receiving a digital broadcast program stream and storing the same on a recording medium such as a digital video disc.

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 programs in the same bandwidth, and with digital communication media and digital storage media. It 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 installed on the receiving side. A plurality of programs included in the transport stream are demultiplexed so that only one desired program is selected, and the original audio and video signal is decoded by a decoder built into the set-top box for the selected program, and the original audio and video signal is A / V. To the 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 the digital data stream from the set-top box, and storing it in a streamer such as a digital video disc (DVD) recorder through a communication interface such as an IEEE-1394 serial bus, and storing the stored digital data stream. Research into a system that can reproduce digital audio and video through an AV output device such as a television by editing and reproducing and transmitting the communication interface to a set-top box via a medium is in progress.

In the above system, there is a need for a method of storing a received digital broadcast program stream on a recording medium, and then efficiently generating a playlist, which is playback order information for the stored digital broadcast program stream. have.

Accordingly, the present invention was created in view of the above circumstances, and when a digital broadcast program stream is received and stored in a recording medium such as a digital video disk, the present invention efficiently generates a playlist for the stored digital broadcast program stream. The purpose is to provide a method for creating a playlist.

1 schematically shows a system to which a play list generating method according to the present invention is applied,

2 schematically shows the configuration of a digital broadcast program stream,

3 is a diagram illustrating a process of generating a play list for the stored broadcast program stream by a play list generating method according to an embodiment of the present invention when storing a digital broadcast program stream,

4 is a flowchart illustrating a play list generating method according to an embodiment of the present invention;

5 is a diagram illustrating a process of generating a play list for the stored broadcast program stream by a play list generating method according to another embodiment of the present invention when storing a digital broadcast program stream.

6 is a flowchart illustrating a play list generating method according to another embodiment of 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

According to an aspect of the present invention, there is provided a method for automatically generating a play list according to the present invention, the method comprising: detecting a specified play entry point information corresponding to a recorded digital broadcast data stream; And a second step of generating a reproduction list of the recorded data stream on the basis of the entry position in the detected reproduction entry point information.

Hereinafter, preferred embodiments of the playlist generating method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 schematically shows an example of a system to which a method for generating a playlist according to the present invention may be applied. The system includes a set-top box 100, a communication interface (IEEE 1394), and a streamer (200). It is.

The set-top box 100 receives a transport stream (TS) multiplexed by a system encoder multiplexed by a system encoder from a broadcasting station, demultiplexes it, and selects a processing unit by the controller 140 according to a user's request. The transport stream for the program tuned at 110 is decoded by the system decoder 120 and output through an AV set such as a television, or through a communication interface IEEE 1394 to store the selected transport stream. 200).

In addition, the set-top box 100 decodes program specific information (PSI) included in the transport stream for the program tuned by the channel selection processing unit 110 in the decoder 120 to the control unit 140. As transferred, the controller 140 stores the program service information in the program information area M1 of the memory 150. Here, the program configuration information may be recorded program information for all programs of all the channels received, the program configuration information in the transmission channel number, channel name, program name, schedule, program category information of each program, each program Attribute information of the constituent streams and the viewing ratings of each program may be included.

In the set-top box 100, the control unit 140 forms a program table having a time axis and a channel axis on the television screen by using program configuration information stored in the program information area M1 of the memory 150 at the request of a user. You can control the display.

In addition, the set-top box 100 transmits the program tuned at the request of the user to the streamer 200 via the IEEE1394 communication interface 130, 140, and transmits the program by the streamer 200 to the digital video disc (DVD). It can be recorded on the recording medium 230, such as).

In addition, the set-top box 100 receives a program read from the recording medium 230 by the streamer 200 according to the user's request via the IEEE1394 communication interface (140,130) to decode the decoder 120 The 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 programs recorded on the recording medium in order to play respective roles in recording and reproducing the programs. Therefore, in the above system, a file for recording program management control information used only by the set-top box 100 (hereinafter, referred to as an "application management information file") and a record program management control information used by the streamer 200 only. File for the program (hereinafter referred to as "streamer management information file"), and recorded program management control information that can be shared between the set-top box 100 and the streamer 200 (hereinafter, "common management information"). Files, which are recorded on the recording medium 230 of the streamer 200, are used to manage the programs recorded on the recording medium.

The application management information file is read by the read stream processing unit 240 of the set-top box 200 at the initial operation of the set-top box 100 and transmitted to the set-top box 100 via the IEEE 1394 communication interface and the set-top box 100 The controller 140 stores information in the management information area M2 of the memory 150 by the controller 140 of the memory 150, and then adds and updates the management information for the newly recorded program when the program is recorded by the user's request. Is recorded. In addition, when the recording program is reproduced by a user request, the controller 140 makes a request for playback to the streamer 200 using management information of an application management information file. The application management information file 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 through a communication interface to control the controller 250 of the streamer 200. The recording stream is recorded on the recording medium 230 by the storage stream processing unit 220 under the control of.

The streamer management information file and the common management information file are read by the read stream processing unit 240 of the set-top box 200 when the streamer 200 is initially driven, and is controlled by the control unit 250 of the streamer 200. After being stored in the memory 260, management information for a newly recorded program at the time of recording a program by a user request is added and updated by the controller 250. In addition, when the recording program is reproduced by the user's request, the control unit 250 reproduces the program stored in the recording medium 230 by using the management information of the streamer management information file according to the request signal from the set-top box 100. Will be performed. The streamer management information file stored in the memory 260 is read at the end of the recording operation of the streamer 200 or at the time of turning on / off the recording medium, and is recorded by the storage stream processing unit 220 under the control of the controller 250. Is recorded on 230.

As shown in FIG. 2, the transport 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 the entry point of the 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, a playlist generation method according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.

In the present embodiment, as shown in Fig. 3, it is assumed that records # 1 to # 4 (Records # 1 to 4; where records are data recorded by one recording operation) are recorded.

First, when a recording mode for a program stream tuned by the channel selection processing unit 110 is set by the control of the control unit 140 at the request of a user, the control unit 140 controls the input program stream to the IEEE1394 communication interface 130 or 210. ) Is transmitted to the streamer 200, and a write control signal is transmitted to the controller 250 of the streamer 200 via the IEEE 1394 communication interface 130 and 210, and the streamer 250 is controlled. The control unit 250 recognizes a recording control signal transmitted from the control unit 140 of the set-top box 100 and controls the storage stream processing unit 220 to record the transmitted program on the recording medium 230. It controls (step S11).

Thereafter, the control unit 140 of the set-top box 100 checks the input PID decoded by the system decoder 120 and checks whether the PID value is changed (step S13). Here, since the PID value is set to a value that can be distinguished from each other in different programs, it is possible to easily distinguish between programs.

Here, if it is assumed that the PID of the program # 1 (PG # 1) and the advertisement (CM) is transmitted to a value that can be distinguished, it is checked whether the PID value changes between them, the control unit 140 is a program # 1 An entry point (playback entry point information) is recorded between the PG # 1 and the advertisement CM, and stored in the memory 150 (step S15). As the above steps S11 to S15 are repeatedly performed by the user until the recording mode is terminated, the control unit 140 switches between the advertisement CM and the program # 2 (PG # 2), and the program # 2. At the end, the PID value confirms the change, records the entry point at that position, stores it in the memory 150, and terminates the recording operation for record # 1 as the recording mode is terminated at the request of the user (step) S17).

Subsequently, the controller 140 includes a program PG # 2 recorded between entry points (playback entry point information) at which the interval between the recorded entry points is greater than or equal to a predetermined size, in the playlist PlayList # 1. Automatically record (step S19). Here, the interval of entry points is for not including the fragment of the program recorded too short or the commercial in the playlist.

Next, as records # 2 to # 4 are recorded at the request of the user, the controller 150 controls the end of the program # 3 (PG # 3), between the program # 4 (PG # 4) and the advertisement CM. , Between advertisement (CM) and program # 5 (PG # 5), between program # 5 (PG # 5) and program # 6 (PG # 6), program # 6 (PG # 6) and program # 7 (PG # Between 7), record each entry point.

The control unit 140 automatically stores the programs PG # 3, PG # 4, and PG # 6 recorded between entry points whose intervals between the recorded entry points are greater than or equal to a predetermined size, in the playlist PlayList # 1. Record additional.

As described above, according to an embodiment of the present invention, an entry point is recorded using a PID included in a broadcast program stream, and a playlist can be automatically generated using the recorded entry point. In addition, by automatically generating a playlist by grouping only programs whose interval between the recorded entry points is greater than or equal to a predetermined size, it is possible to prevent the inclusion of undesired programs at the time and end of the recording operation. It is also possible to prevent the inclusion.

Next, a playlist generating method according to another embodiment of the present invention will be described in detail with reference to FIGS. 5 and 6.

Also in this embodiment, as in the above-described embodiment, it is assumed that records # 1 to # 4 (Records # 1 to 4) are recorded.

First, when a recording mode for a program stream tuned by the channel selection processing unit 110 is set by the control of the control unit 140 at the request of a user, the controllers 140 and 250 operate by the same operation as described above. Control to record the input program stream (step S21).

Thereafter, the control unit 140 of the set-top box 100 checks the input PID decoded by the system decoder 120 and checks whether the PID value is changed, and also displays random access on the transport packet as shown in FIG. 2. (random access indicator) is checked (step S23). Here, the random access indication marks the beginning of the sequence header of the video, so that random access is possible at that position.

Next, an entry point is recorded at the position identified in step S23 and stored in the memory 150 (step S25).

As the above operation is repeatedly performed for records # 1 to # 4 (Records # 1 to 4), a plurality of entry points are recorded as indicated by arrows in the program set of FIG.

Subsequently, at the request of the user, the controller 140 transmits the recorded entry points to the controller 250 of the streamer 200 via the IEEE1394 communication interface 130, 210, and the controller 250 is transmitted. By controlling the read stream processing unit 240 using an on entry point, each entry is performed by randomly accessing a position of a program stream recorded on the recording medium 230 corresponding to each entry point, thereby performing a reproducing operation. The recording data corresponding to the position is read out and input to the decoder 120 of the set-top box 100 via the IEEE 1394 communication interface 210 or 130. Accordingly, as the decoded data is output to the television, which is an AV output device, to the decoder 120, as the user selects a recorded program while checking the recorded program content corresponding to the entry point, as shown in FIG. List # 2) can be generated (step S29).

As described above, according to another embodiment of the present invention, an entry point is recorded using a PID and a random access indication included in a broadcast program stream, and the recorded program stream is randomly accessed using the recorded entry point to display the screen. Allows you to create a playlist while checking the contents of the recorded program.

In addition, this invention is not limited to the system demonstrated with reference to FIG. The apparatus for performing the same function as the set-top box and the apparatus for performing the same function as the streamer are installed in one set, and digital broadcasting programs are also provided in a system configured to communicate with each other via an internal bus. When receiving and storing the present invention can be applied.

According to the method and apparatus for generating a playlist according to the present invention as described above, a PID included in a broadcast program stream is detected and an entry point is recorded using the detected PID, and the entry point is reproduced using the recorded entry point. You can create lists automatically. In addition, the PID and the random access indication included in the broadcast program stream are detected, the entry point is recorded using the recorded program entry, the recorded program stream is randomly accessed using the recorded entry point, and the contents of the recorded program are displayed on the screen. You can create a playlist while checking.

Claims (3)

A first step of detecting packet identification information included in the data stream while recording a data stream of an input digital broadcast program on a recording medium; A second step of recording, when the detected packet identification information is changed, reproduction entry point information corresponding to the recording position of the data stream recorded at the time of the change; And And a third step of automatically generating a data stream recording section between the reproduction entry point information as a reproduction list when the recording interval between the reproduction entry point information is more than a predetermined recording size. . A first step of detecting a packet identification information or random access indication information included in the data stream while recording a data stream of an input digital broadcast program on a recording medium; A second step of recording, when the detected packet identification information or the random access instruction information is changed, reproduction entry point information corresponding to the recording position of the data stream recorded at the change time point; Detecting the recorded reproduction entry point information and displaying the information of the data recorded in the recording section between the reproduction entry point information; And And generating at least one of recording data of a recording section selected by the user as a playlist using the displayed information on the screen. A first step of confirming whether a user requests a section selection when playing a data stream of a recorded digital broadcast program; Detecting a playback entry point close to a corresponding playback point of the data stream in the section selection request; And And generating a playlist of the recorded data stream on the basis of the detected proximity playback entry point.