KR100242133B1 - Seamless reproducing method hauing a toughness for extortion - Google Patents

Abstract

end. TECHNICAL FIELD This invention relates to a seamless playback method of a multi-angle playback system comprising a digital video disc playback apparatus.

I. An object of the present invention is to provide a seamless reproducing method of searching for a cell to be reproduced next, even if a cell does not obtain a start position of a cell to be replayed from a cell currently being reproduced.

All. SUMMARY OF THE INVENTION A seamless playback method of a multi-angle playback system, comprising: seamless angle change information when a position information of an interleaved unit to be played next cannot be obtained from an interleaved unit currently playing during a predetermined angle playback. Search for the start address of the interleaved unit to be reproduced next.

la. Significant use of the invention: Can be used in multi-angle playback systems such as digital video disc playback devices.

Description

SEAMLESS REPRODUCING METHOD HAUING A TOUGHNESS FOR EXTORTION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to angle reproduction in a multi-angle reproduction system, and more particularly to a seamless reproduction method capable of continuously playing angle pictures despite disturbances such as defects and external shocks of a recording medium.

Digital video disc is one of digital moving picture disc media. It is a next-generation high-definition and high-definition multimedia recording medium that stores digital video of MPEG (Moving Picture Experts Group) 2 for more than two hours. The digital video disc may include an interleaved block made for reproduction of a screen shot at multiple angles for the same scene.

1 shows a form (a) in which an interleaved block including a plurality of angles is recorded on a disc, a configuration (b, c, d) of a cell for each angle, and a bitstream structure (e). An illustration is shown. Interleaved blocks (or angle blocks) are created when you want to play scenes shot from different angles for the same scene. In the conventional multi-angle reproducing system, when an interleaved block is encountered during reproducing of the disc 10, only a specific angle specified by an external key or by an angle number already set inside the apparatus is reproduced. A digital video disc can record up to nine angles. In FIG. 1, an interleaved block in which only three angles are recorded is illustrated. Referring to FIG. 1, one interleaved block is composed of four interleaved video units (hereinafter referred to as ILVUs) 1 to ILVU4, and this one ILVU is further divided into three angle cells (called C). Is done. The actual picture reproduced during interleaved block reproduction as shown in (a) is composed of one specific angle selected from each ILVU. In one angle, several screens can be inserted as shown in (b), (c) and (d). The number is inconsistent because the amount of data to be recorded varies depending on the complexity of the screen. Assuming that the multi-angle playback system is set to angle 1 by the user, the system control unit only uses C # 10, C # 11, C # 12, and C # 13 as shown in (b) of the interleaved block (a). Must be selected and played.

For example, in the case of playing angle 1, first, the system control unit controls the data pack (Data Pack: DP) hereinafter included in C # 10 when C # 10 is input to the buffer of the data processor when playing angle 1. ) Get the start and end addresses of C # 11. The control DP refers to a data sector containing information (HLI) capable of controlling the bitstream and position information of a cell to be reproduced next when an angle is reproduced. The control DPs are arranged at intervals of about 0.5 seconds and are arranged as shown in FIG. 1 (e) so that at least one of them is necessarily read while regenerating one ILVU. (E) shows an example of a bitstream of a digital video disk, where V and A represent an MPEG video pack and an AC3 audio pack, respectively, and SP represents a sub-picture data pack representing subtitles, menus, and the like. On the other hand, when the start and end addresses of C # 11 are obtained from the control DP of C # 10, the system controller should search (track jump) C # 11 and write data to the buffer before the buffer is empty. Otherwise, an underflow of the screen occurs and the playback screen is stopped.

As described above, the most important thing in the multi-angle reproduction system is to find and quickly move to the start address of the ILVU to be reproduced next through the control DP of the ILVU currently input to the buffer. However, if the control DP is damaged due to a defect on the digital video disc, or if the control DP is not played back normally due to an external shock or a failure of the playback system, the start position of the angle cell in the next ILVU is unknown and the playback picture is frozen or unintentional. There is a problem that the angle can be reproduced.

Accordingly, an object of the present invention is to provide a seamless playback method in which a cell to be played next can be searched even if a start position of a cell to be played next is not obtained from a cell currently being played in a multi-angle playback system.

In order to achieve the above object, the present invention provides a single interleaved unit (ILVU) in which cells of multiple angles photographed from different angles of the same scene are reproduced, and the interleaved unit (ILVU) is recorded. In a seamless playback method in a multi-angle playback system,

A first step of checking whether cell position information of an interleaved unit (ILVU) to be reproduced next is obtained through a control data pack during cell reproduction of a selected angle among angles in a predetermined interleaved unit (ILVU);

If the cell position information of the interleaved unit ILVU to be reproduced is not obtained after the inspection result, one interleaved unit may be added to the start position information value of the interleaved unit ILVU positioned before the cell of the currently playing angle. A second process of acquiring position information of an interleaved unit (ILVU) cell to be reproduced next by adding a double value of the ILVU size;

And a third process of seamlessly reproducing a series of cells constituting the same angle selected by searching the acquired position information.

1 is a diagram illustrating a form in which an interleaved block including a plurality of angles is recorded on a disk, a configuration of a cell for each angle, and a bitstream structure;

2 is a block diagram of a digital video disc reproducing apparatus as an example of a multi-angle reproducing system;

3 is a control flowchart of a system controller 24 for explaining a seamless playback process according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. Also, in the following description, many specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In the following description, ″ seamless playback ″ is the opposite of non-seamless playback. In general, seamless playback is a technique that causes the screen to immediately jump to another angle when the user presses an angle change key (at the time of angle change). The non-seamless playback method refers to a technique of playing a different angle from the previous playback time when the user presses the angle change key and the screen is interrupted. In detail, referring to FIG. 1, first, in a seamless playback, assuming that the cell currently being played is C # 11 of the first angle, and there is a change key input from the user to the second angle, C # 11 of the first angle is used. After the playback is completed, playback of C # 22 of the second angle is started and playback is started, so that playback of C # 22 of the second angle is started after the screen proceeds continuously. On the other hand, in the above-described example, in the case of non-seamless playback, if there is an angle change key input during C # 11 playback of the first angle, the search for the first C # 21 is started and playback is resumed, thereby continuity of the playback screen is paused.

2 is a block diagram of a digital video disc reproducing apparatus as an example of a multi-angle system. In FIG. 2, the digital video disc (hereinafter referred to as disc) 10 is rotated at a predetermined speed by the rotation of the disc motor 16. Pick up and deck 12 generate laser light and receive the reflected light to read data from the disc 10, the rotation of the disc 10 and the transport of the pickup and the disc 10 ) Perform a loading operation. The signal reproducing section 18 reproduces the signals recorded on the disc 10, such as amplifying the RF signal output from the pickup, removing noise, digital conversion of the analog RF signal, and synchronous detection. The servo controller 26 performs disk rotation control, focusing and tracking control of pickup, etc. for accurately reading data recorded on the disk 10. The system control unit 24 collectively controls the overall operation for reproducing the signal recorded on the disc 10. The memory 22 connected to the digital signal processing unit 20 stores the processing data of the digital signal processing unit 20 as a track buffer memory. The digital signal processor 20 performs 16-8 demodulation of the signal input from the signal reproducing unit 18 and performs data PLL, descrambling, error detection, error correction, and track buffer control functions by synchronous detection. Specifically, the 16-8 demodulator provided in the digital signal processor 20 detects the synchronization with respect to the input data, performs 16-8 demodulation, and stores the same in the memory 22. In addition, the error correction unit provided in the digital signal processor 20 reads data stored in the memory 22 and corrects the error, and stores the result in the memory 22 again. In addition, the system controller 24 controls the operation of the disk 10 by finding ID data, which is information indicating the position of the disk 10, from the data stored in the memory 22 and transferring the ID data to the system controller 24. After the descrambling is performed on the remaining data, the data is written to the memory 22 again, and when the data is requested by the digital video decoding unit, the data is read from the memory 22 and handed over. The key input unit 28 is provided with a plurality of keys for operating commands such as play, stop, search, etc. as a user interface means, and the display unit 30 includes various display data related to the playback of the disc 10. Is displayed by. The video decoder 36 decodes the compressed video data and outputs the compressed video data in the form of digital video. The sub-picture decoder 38 decodes the sub-picture information into a still picture and outputs it in the form of digital video. The video blanking information (hereinafter referred to as VBI) decoder 40 and highlight information (hereinafter referred to as HLI) decoder 42 decodes data in the form of a still picture according to a specific purpose. Output in the form of digital video. The audio decoder 44 decodes the audio data and outputs it in the form of digital audio. The video mixer 46 mixes the outputs of the video decoder 36, the sub-picture decoder 38, the VBI decoder 40, and the HLI decoder 42 output in the form of digital video. Convert it properly so that it can be displayed on the screen. The video output unit 48 converts the digital video into an analog form and outputs the video to the monitor. The audio output unit 50 converts the digital audio into an analog form, amplifies it, and outputs the digital audio to the speaker. In the above configuration, the video decoder 36, the sub-picture decoder 38, the VBI decoder 40, the HLI decoder 42, and the audio decoder 4 are known video / audio decoders (MPEG2 decoders) ( 34). The demultiplexer 32 distinguishes the type of bitstream input as a data phaser, that is, a video signal, an audio signal, and a sub-picture signal, and transmits them to each decoder of the MPEG2 decoder 34.

3 shows a control flowchart of the system controller 24 for explaining a seamless playback process according to an embodiment of the present invention. Hereinafter, a seamless reproduction process having robustness against disturbance will be described in detail with reference to FIGS. 2 and 3.

First, if there is a playback start command from the user through the key input unit 28, the system control unit 24 enables data transmission and buffering in step 60, and then proceeds to step 62 to start playback address (Address: AD). Navigate. When the start address AD is found in step 64, the playback of the data recorded on the disc 10 is started. During data reproduction, the system control unit 24 checks whether the control DP is reproduced in step 66. If the control DP is reproduced, the system control unit 24 proceeds to step 68 to determine whether an error has occurred in the reproduced data. If no error occurs as a result of the test, the system controller 24 proceeds to step 70 and proceeds to step 72 when there is a seamless playback information, and performs the following calculation process. First, the system controller 24 determines the end address AD of the ILVU to which the currently playing angle cell C belongs, the start address AD of the next ILVU to the next ILVU to which the currently playing angle cell C belongs, and the current playback. The end address (AD) position of the next ILVU of the ILVU to which the corresponding angle cell belongs and the change information for each angle are calculated. If the buffer write of the currently transmitting ILVU is completed in step 74, the system controller 24 searches for the angle cell start address AD in the next ILVU calculated in step 72. When the start address AD is completed during the search, steps 66 through 76 are repeated to continuously reproduce the predetermined angle.

However, if a data error occurs due to the defect on the disk 10 in step 68, the system controller 24 proceeds to step 78 to check whether the position information of the angle cell C in the ILVU to be reproduced is obtained. If the result of the inspection fails to obtain the position information of the angle cell C to be reproduced next, the system controller 24 proceeds to step 80 and through the seamless angle change information, the angle cell start address (AD, that is, start position information) in the next ILVU Calculate Specifically, the playing time of each angle is the same. As this is defined in the digital video disc format, each ILVU is generally the same size. This makes it possible to calculate the exact position. Even if the size of each ILVU is slightly different, if the position can be found and the normal control DP can be read, information on the position of the ILVU can be obtained again, and playback can be performed normally. Of course, in this process, it is unavoidable to freeze the screen and not to play 1ILVU, but at least the disc 10 cannot be played back. The method of calculating the angle cell start address (AD) in the ILVU to be reproduced next through the seamless angle change information is as follows.

▶ Starting position of the angle cell to be played next = total of the previous ILVU starting position + 2 × ILVU size.

For example, if the control DP is damaged during regeneration of C # 11 in Fig. 1, and the position of the next ILVU C # 12 is not obtained, the starting position of C # 12 is calculated as follows.

C # 12 starting position = C # 10 ILVU starting address (AD) + 2 x (C # 10 ILVU size + C # 20 ILVU size + C # 30 ILVU size)

If the position for C # 13 is not obtained even during the playback of C # 12, the position can be calculated by the above method.

As described above, the system control unit 24, which calculates the start address AD of the angle cell C in the next ILVU, then checks whether the buffer write of the currently transmitting ILVU has ended in step 74. When the buffer write is completed, the process proceeds to step 76 to search for the start angle AD of the angle cell C in the next ILVU.

As described above, the present invention can obtain the position information of the angle cell to be reproduced next by the above calculation method even if the information on the angle cell to be reproduced next cannot be obtained due to disturbance such as a defect or external shock on the disc. Seamless playback is possible.

As described above, according to the present invention, even when the control data pack is damaged due to the defect or the error occurs in the control data pack due to external shock, the seamless angle change information is obtained to obtain the position information of the angle cell to be played next. There are advantages that can be done.

Claims (2)

Seamless playback in a multi-angle playback system in which cells of multiple angles photographed from different angles for the same scene form one interleaved unit ILVU, and reproduce the recording medium on which the interleaved units ILVUs are recorded. In the method, A first step of checking whether cell position information of an interleaved unit (ILVU) to be reproduced next is obtained through a control data pack during cell reproduction of a selected angle among angles in a predetermined interleaved unit (ILVU); If the cell position information of the interleaved unit ILVU to be reproduced is not obtained after the inspection result, one interleaved unit may be added to the start position information value of the interleaved unit ILVU positioned before the cell of the currently playing angle. A second process of acquiring position information of an interleaved unit (ILVU) cell to be reproduced next by adding a double value of the ILVU size; And a third process of seamlessly reproducing a series of cells of the same angle selected by searching the acquired position information. A digital video disc reproducing apparatus having an interleaved block composed of unit interleaved video units (ILVUs) composed of a plurality of angles on a disc, A first step of checking whether cell position information of an interleaved unit (ILVU) to be reproduced next is obtained through a control data pack during cell reproduction of a selected angle among angles in a predetermined interleaved unit (ILVU); If the cell position information of the interleaved unit ILVU to be reproduced is not obtained after the inspection result, one interleaved unit may be added to the start position information value of the interleaved unit ILVU positioned before the cell of the currently playing angle. A second process of acquiring position information of an interleaved unit (ILVU) cell to be reproduced next by adding a double value of the ILVU size; Searching for the acquired position information when the buffer write of the interleaved unit being played is finished; And a fourth process of reproducing the searched angle cell.

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