JP2000105977A - Data processing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the interval of time from the operating point of time to the switching point of time of an actual output video as much as possible when a scene is switched at the time of reproducing an interleave block part. SOLUTION: When a first channel unit is extracted among a data train, in which a unit of plural channels is interleaved and is written into a buffer 100 or written data are read out, a written pointer is obtd. in a writing pointer processing part 201, a reading pointer is obtd. in a reading pointer processing part 202 and a unit pointer is obtd. in a unit pointer processing part 203. Then, when instruction to take data of a second channel into a buffer is inputted, the writing pointer is rewritten into the unit pointer, provided that the relation between the writing pointer and the reading out pointer is satisfies prescribed conditions. The unit data of the second channel are written into the buffer from the position where this written unit pointer is shown.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing method and apparatus useful for reproducing data of an interleave block recorded on, for example, a digital video disk (DVD).

[0002]

2. Description of the Related Art In a DVD, a plurality of video scenes are finely divided into interleaved units.
A technology has been developed which has a portion in which interleaving units of each scene are mixed and arranged to form an interleaving block. This is to make it possible to freely select and reproduce video captured from different angles when the interleaved block portion is being reproduced.

[0003]

When a scene switching operation to the second channel is performed while a scene of the first channel of the interleaved block is being reproduced, the reproducing device operates the interleave unit of the second channel. To the playback state.

However, there is a case where the time from the operation time to the time when the video output state of the first channel is changed to the video output state of the second channel becomes long. SUMMARY OF THE INVENTION It is an object of the present invention to provide a data processing method and apparatus capable of shortening a time interval from an operation time to an actual output video switching time at the time of scene switching as much as possible.

[0005]

In order to achieve the above object, the present invention selectively extracts unit data of a first channel from a data string in which unit data of a plurality of channels are interleaved. In the data processing method for writing data to the buffer and reading the data written to the buffer, a position for sequentially writing data in the buffer is used as a write pointer, a position for reading data in the buffer is used as a read pointer, and data to be written to the buffer is used. Holds, as a unit pointer, at least one or more write positions in the case of the first data or the last data of the unit data,
When an instruction to take in data of the second channel into the buffer is inputted, the write pointer, the read pointer, and at least one unit pointer stored in the pointer position storage means are referred to, and the write pointer and the read pointer are referred to. When the relationship is a predetermined condition, the write pointer is rewritten to the unit pointer, and the unit data of the second channel is written to the buffer from the position indicated by the rewritten unit pointer.

According to the above means, in the buffer,
Since the write pointer is converted to the unit data pointer closest to the first channel unit data being reproduced, the next unit data of the second channel can be written starting from the unit pointer closest to the current read pointer. Becomes

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. A track buffer 100 is supplied via an input line 101 after data read from an optical disk is decoded and error-corrected. The write address and the read address of the track buffer 100 are given from the memory address generator 110 to the track buffer 100. The data read from the track buffer 100 is output via the output line 102.

[0008] The memory address generator 110 includes a write pointer processing unit 201 and a read pointer processing unit 20.
2 is attached. The memory address generator 110 generates a write real address from the value of the write pointer processing unit 201. The memory address generator 110 generates a read address from the value of the read pointer processing unit 202.

A unit pointer storage unit 203 is provided. The unit pointer storage unit 203 stores an interleave unit (described later) in the track buffer 10.
When it is written to 0, counting is performed in units of a unit, and a write pointer when the writing of the interlib unit into the track buffer is started is acquired from the write pointer processing unit 201 and stored. Therefore, every time the head of the interleaved unit is written to the track buffer 100, the unit pointer storage unit 203 has a write pointer at that time.

The writing timing of the interlibrary unit is grasped by the system control unit 204.
When the navigation pack arrives at the input line 101, the system control unit 204 can grasp whether the head of the interleave unit has arrived. As described later, the interleave unit includes at least a navigation pack at the beginning thereof, and the navigation pack includes whether the data to which the navigation pack belongs is an interleave unit or whether the data is data before the interleave unit. , And attribute information that describes whether it is the head of the interleave unit. Therefore, when the interleave unit arrives, the system control unit 204 controls the unit pointer storage unit 203 to take in the write pointer at that time.

Since the attribute information also describes information (end) information at the end of the interleave unit, the information may be grasped and a unit pointer may be stored. When the unit pointer matches the read pointer, the corresponding unit pointer is deleted by the system control unit 204.

The attribute information also describes the address and size of the next interleave unit of each scene. By recognizing this size, one pack is defined by the predetermined number of bytes (2048), so that it is possible to calculate the number of packs of the next interleave unit.

Timing pulses for writing to and reading from the track buffer 100 are sent from the memory timing pulse generator 205 to the track buffer 10.
0, which enables high-speed writing and reading.

The above device has the following functions as a whole. In the DVD, a plurality of video scenes are each divided into small pieces, and are interleaved units.
A technology has been developed which has a portion in which interleave units of each scene are continuously mixed and arranged on a track to form an interleave block. This is to allow a desired scene to be freely selected and continuously played back when the video captured from different angles is played back in the interleaved block.

When the channel is switched, that is, when the scene of the first channel is switched to the scene of another channel having a different angle, scene switching information is inputted from the outside, and the information is executed by the system control unit 204 grasping this. Is done.

Here, the above apparatus selectively extracts the data of the first channel interleave unit from the data sequence in which the data of the interleave units of a plurality of channels are interleaved and writes the data into the track buffer. When performing control to read data written in the track buffer, the following configuration is provided.

That is, write pointer processing means for indicating a position at which data is sequentially written in the track buffer as a write pointer, read pointer processing means for indicating a position at which data in the buffer is read as a read pointer, and writing to the track buffer. Unit pointer storage means for storing at least one write position as a unit pointer when the data is the first data or the last data of the unit data.

When an instruction to input the data of the second channel into the track buffer is inputted, the write pointer, the read pointer, and at least one unit pointer stored in the unit pointer storage means are referred to. And a system control means for rewriting the write pointer to a unit pointer stored in the unit pointer storage means when the relationship between the interleaved units indicated by the write pointer and the read pointer is a predetermined condition. Thus, the unit data of the second channel is written to the track buffer from the address indicated by the rewritten unit pointer.

This means that, when the interleave unit indicated by the write pointer and the read pointer is a different interleave unit, the write pointer is corrected to be a pointer position that has returned in time, and as a result, the read pointer is The write pointer is set at the position of the unit pointer closest to the end of the indicated interleave unit. As a result, the writing of the next new interleave unit of the second channel is started from the backward pointer,
The interleave unit of the second channel closest in time to the interleave unit currently being read is reproduced.

FIG. 2 is an explanatory diagram of the interleave unit shown for further explaining the operation of the above-mentioned device.
In this example, the first, second, and third
3 shows an example in which each scene is divided into six.
These interleaving units are arranged on the track of the optical disc in the order shown by the dotted line. In other words, the units having the same order of division in each scene are mixedly arranged.

FIG. 3 is a diagram showing an example of a transition state of the interleave unit on the track buffer. FIG.
(A1) and (A2) are examples in which the write pointer (W) and the read pointer (R) at the time of scene switching point to the same interleave unit (unit 2 of scene 1). In this case, the system control unit 204
Determines that the same interleaved unit has been written and read, and starts writing unit 3 of scene 3 from the position where reading of unit 2 of scene 1 ends, that is, the position of the next unit pointer. . The setting of the unit pointer is performed by the system control unit 2
04 may be either when the unit end information of the unit 2 of the scene 1 is detected or when the tip information of the unit 3 of the scene 3 is detected.

In the next example, FIGS. 3B1 and 3B2, the write pointer (W) at the time of scene switching points to the unit 3 of the scene 1, and the read pointer (R) points to the unit 2 of the scene 1. If it is. In this case, the system control unit 204 refers to the write pointer and the read pointer, and determines that the written interleave unit is different from the read interleave unit. In this case, the unit pointer storage unit 203 is referred to. Then, at least one unit pointer is stored. This is because at least the unit pointer at the head position P1 is recognized at the time of writing the unit of scene 1 and is written in the unit pointer storage unit 203. Therefore, the system control unit 204 transfers the unit pointer written in the unit pointer storage unit 203 to the write pointer processing unit 201 as a write pointer. As a result, the data is taken into the track buffer 100 from the head of the unit 3 of the scene 3 as shown in (B2). As a result, next to the unit 2 of the currently reproduced scene 1, the unit of another channel is
In addition, the reproduction of the unit 3 of the scene 3 which continues temporally is performed.

In the next example, that is, FIGS. 3C1 and 3C2, the write pointer (W) at the time of scene switching points to the unit 5 of the scene 1, and the read pointer (R) points to the unit 2 of the scene 1. If it is. As an example where such a case occurs, the track buffer 10
This occurs when the memory capacity of 0 is large. In this case, the system control unit 204 refers to the write pointer and the read pointer, and determines that a different interleave unit has been written or read. Also,
Referring to the unit pointer storage unit 203, in this case, three unit pointers P1, P2, and P3 are stored. This is because at the time of writing the unit of scene 1, at least the unit pointers at the head positions P1, P2, and P3 are recognized and the unit pointer storage unit 20
3 is written. Therefore, the system control unit 204 sets the unit pointer P1 written first as a write pointer in the write pointer processing unit 201.

Then, in the track buffer 100 after the scene switching, the interleave units are written in the order shown in (C2) of FIG. For this reason, after the unit 2 of the scene 1 currently being reproduced, the unit 3 of the temporally successive scene 3 of another channel is reproduced.

FIG. 4 shows a more specific block diagram of the present invention. 1 will be described with the same reference numerals. Input data from the input unit is output to the input line 101 via an input buffer 401 using a memory (FIFO) capable of high-speed writing and reading, and supplied to the track buffer 100. The data of the input unit 400 is provided to a navigation pack (NVP) detector 402 and an ID detection and control circuit 403 for detecting the ID of the pack.

The ID detection and control circuit 403 determines the ID of the pack when the write pointer counter 411 stops.
Is to be kept. And there is kickback operation, and when the same pack arrives as when it stopped again,
This is a circuit for supplying a timing signal for restarting writing to the timing generator 405.

Next, the operation of writing and reading data to and from the track buffer 100 will be described. The input data is temporarily buffered in the input buffer 401 and written into the track buffer 100 at high speed. The track buffer 100 uses a DRAM of about 4 Mbit and operates as a ring buffer. The data read from the track buffer 100 at high speed is temporarily stored in the output buffer 406, and is read from the output buffer 406 at a rate required by the subsequent stage. Output buffer 40
When 6 becomes empty, data is read from the track buffer 100 again at high speed.

At the time of writing / reading control, the write pointer counter 411 and the read pointer counter 4
The output of the counter 12 is monitored by the ring counter 413. The ring counter 413 controls the write pointer so that it does not overtake the read pointer.

When the write pointer catches up with the read pointer, or when the read pointer catches up with the write pointer, the ring counter 413
Supplies a write or read stop signal to the timing generator 405. Thus, writing or reading stops.

In particular, when the writing is stopped, the full information of the track buffer is given to the host computer 408 via the host interface 407 as a memory full signal. Then, the host computer 40
8 indicates the pack ID at that time in the ID and control circuit 403.
Hold. Further, the host computer 408 causes a kickback operation of the pickup to be performed one track before, for example, via a pickup control unit (not shown).
There is a kickback operation, and when the same pack arrives again when stopping, a timing signal for restarting writing is supplied to the timing generator 405. When writing stops after kickback, the track buffer 100
In, the reading progresses, and after that, there is a margin for writing, so that there is no problem even if the writing is restarted.

Next, for example, a basic operation for reproducing scene 1 will be described. When the navigation pack (NV_P) arrives at the input unit 400, the navigation pack detector 402 extracts various information included in the navigation pack and notifies the host computer 408 via the host interface 407.
The various information includes the number of packs of the interleave unit, the ID of the first pack, and the like. These pieces of information are recognized by the host computer 408.

Now, interleave unit 1 of scene 1
Arrives, the number of packs of the interleave unit 1 of the scene 1, the interleave unit 2 of the scene 1,
The ID, address, and the like of the first pack of the interleave unit 2 of scene 2, the interleave unit 2 of scene 3, and the interleave unit 2 of scene 3 are detected and held.

Then, based on the control of the host computer 408, the timing generator 405 changes so that the capture ends at the end of the interleave unit 1 of scene 1. That is, assume that the count number of packs at the beginning of the interleave unit 1 of scene 1 is K, the number of packs taken in by default is M, and the number of packs of interleave units of scene 1 is N. At this time,
The host computer 408 includes a timing generator 405
To change the number of fetched packs to K + M.

When the capture is completed up to the pack at the end of the interleave unit 1 of scene 1, the pack count value of the timing generator 405 becomes N + M, and reaches the changed number of captured packs. Then, the writing stops. Next, in order to skip the interleave unit 1 of scene 2 and the interleave unit 1 of scene 3 on the disc, the host computer 408 sets the ID of the first pack of the interleave unit 2 of scene 1 to the ID and control circuit 403. I do. At this time, since the number of packs counted by the timing generator 405 is not known, the initial set value M is set. Then, the pack counter in the timing generator 405 is reset. Next, when the first navigation pack of the unit 2 next to the scene 1 read from the pickup arrives, the ID is found and the writing is restarted. Also, the number of packs is changed to the number of packs O, which is also known by M + O.

By repeating such an operation, scene 1 is reproduced. Note that the above method is an example,
Various methods are available for taking only the interleave unit of the selected scene (channel) into the track buffer 100.

Next, specific components provided in the apparatus of the present invention will be described. That is, this apparatus is provided with a latest unit pointer register 501, a unit pointer register 502, and a write (W) pointer jump determiner 503. Each time the head or tail of the interleave unit is written to the track buffer 100, the latest unit pointer register 501 stores
The value of the write pointer counter 411 is latched as a unit pointer. The unit pointer latched in the latest unit pointer register 501 is immediately written to the unit pointer register 502. The unit pointer register 502 can store a plurality of unit pointers.

In the unit pointer register 502, the pointer overwritten by the write pointer is deleted. When the channel (scene) is switched by a user operation, the latest unit pointer register 501
And the read pointer of the read pointer counter 412 are input to the write pointer jump determiner 503 and compared. Here, if the read pointer is later than the latest unit pointer, the write pointer jump determiner 503 causes the timing generator 405 to stop the write pointer.
To the stop signal. As a result, the jump determiner 40
5 supplies a stop signal to the write pointer counter 411 to stop the write pointer counter 411. As a result, the data capturing process stops. In parallel with this, in the unit pointer register 502,
The unit pointer closest to the write pointer is determined as compared to the write pointer. Then, the closest unit pointer is set in the write pointer counter 411.

As a result, the write pointer jumps. Then, from the address indicated by the write pointer, the interlibrary unit of the scene of the angle selected by the user is written into the track buffer 100.

Next, another case will be described. When the channel (scene) is switched by a user operation, the latest unit pointer of the latest unit pointer register 501 and the read pointer of the read pointer counter 412 become the write pointer jump determiner 50.
3 and a comparison is made. Here, if the read pointer is earlier than the latest unit pointer, the write pointer jump determiner 503 does not stop the write pointer. In this case, the currently written interleave unit is taken into the track buffer 100 to the end. Then, when the next interleave unit is taken in, the interleave unit of the channel designated by the user is taken in.

By performing such an operation, FIG.
The function as described in FIG. 3 can be obtained. next,
The data structure recorded on the DVD will be briefly described.

FIG. 5 shows the volume space of the optical disk. The volume space includes a volume and file configuration zone, a DVD video zone, and other zones. UDF (Universal)
Disk Format Specification Revision 1.02) Describes a bridge configuration so that a computer of a predetermined standard can read the data. The DVD video zone has a video manager (VMG) and a video title set (VTS). The video manager (VMG) and the video title set (VTS) are each composed of a plurality of files. The video manager (VMG) is information for controlling a video title set (VTS).

FIG. 6 shows a video manager (VMG).
And the structure of a video title set (VTS). The video manager (VMG) includes video manager information (VMGI) as control data and a video object set (VMGM) as data for menu display. VOBS). Also, backup video manager information (VMG) having the same contents as the VMGI
I).

The video title set (VTS) includes video title set information (VTSI) as control data and a video object set (VTSM) as data for menu display. VOBS)
And a video object set (VTSTT) for a title of a video title set which is a video object set for displaying video. VOBS).
It also has backup video title set information (VTSI) having the same contents as the VMGI.

Furthermore, a video object set for displaying images (VTSTT VOBS) is composed of a plurality of cells. Each cell (Cel)
1) is assigned a cell ID number.

FIG. 7 hierarchically shows the relationship between the video object set (VOBS) and the cell (Cell) and the contents of the cell (Cell). When DVD playback processing is performed, for video breaks (scene change, angle change, story change, etc.) and special playback, a video object unit (VOBU) which is a cell (Cell) unit or a lower layer thereof
Units and even interleaved units (ILVU)
It is now handled in units.

Video Object Set (VOBS)
Is a multiple video object (VOB) IDN1 to V
OB IDNi). Further, one video object includes a plurality of cells (C IDN1 to C I
DNj). One more cell (C
ell) includes a plurality of video object units (VOs).
BU) or an interleaved unit described later. One video object unit (VOBU) is composed of one navigation pack (NV PCK), multiple audio packs (A PC
K), multiple video packs (V PCK), multiple sub-picture packs (SP PCK).

Navigation Pack (NV PCK)
Are mainly used as control data for controlling the reproduction and display of data in the video object unit to which it belongs, and control data for performing data search of the video object unit.

The video pack (V PCK) is main video information and is compressed according to a standard such as MPEG. Sub picture pack (SP PCK) is sub-picture information having auxiliary contents with respect to the main picture. Audio Pack (A PCK) is audio information.

FIG. 8 shows a video object unit (V
OBU) and a video pack in this unit. The video data in the VOBU contains one or more G
It is composed of OP. The encoded video data conforms to, for example, ISO / IEC13818-2. A VOBU GOP is composed of an I picture and a B picture, and this data sequence is divided into a video pack.

Next, a data unit when multi-angle information is recorded / reproduced will be described. When a plurality of scenes having different viewpoints with respect to a subject are recorded on a disc, an interleaved block is constructed on a recording track to realize seamless reproduction. In the interleave block portion, a plurality of video objects (VOBs) having different angles are respectively divided into a plurality of interleave units. As described above, the data is arranged and recorded so that seamless reproduction is possible.

FIG. 9 shows an example of the arrangement of interleaved blocks. This example shows an example in which 1 to m video objects (VOBs) are each divided into n interleave units (ILVUs) and arranged. Each video object (VOB) is divided into the same number of interleave units. In the figure, (1, 1) is the first division unit of scene 1,
(2, 1) means that it is the first division unit of scene 1.

FIG. 10 shows a configuration example of one pack and a packet. One pack includes a pack header and a packet. A pack start code, a system clock reference (SCR), and the like are described in the pack header. The pack start code is a code indicating the start of a pack, and the system clock reference (SCR) is information indicating the location of the entire playback apparatus in the elapsed playback time. The length of one pack is 2048
A byte is defined and recorded as one logical block on the optical disk.

One packet is composed of a packet header and video data, audio data, sub-picture data, or navigation data. The packet header of the packet may be provided with stuffing. Padding may be provided in the data portion of the packet.

FIG. 11 shows the NV The PCK is extracted and shown. NV The PCK basically has a picture control information (PCI) pack for controlling a display image and a data search information (DSI) pack existing in the same video object. In each pack, a packet header and a substream ID are described, followed by data. A stream ID is described in each pack header, and the NV PCK, indicating that the substream I
D identifies PCI and DSI. In each pack header, a packet start code, a stream I
D and the packet length are described, followed by each data. By determining these pieces of information, a navigation pack can be detected.

The PCI packet is navigation data for changing the display content in synchronization with the reproduction of the video data in the video object unit (VOBU) to which the NV packet belongs.

In the PCI packet, PC which is general information
I General Information (PCI GI),
Non-seamless angle information (NSML
ANGLI) and highlight information (H
LI), and recording information (RECI), which is recording information.

PCI The GI has a general description of this PCI.
It is information and the following information is described. This na
Logical block number that is the address of the navigation pack
Bar (NV PCK LBN), managed by this PCI
Indicates the attributes of the video object unit (VOBU)
Video object unit category (VOBU C
AT), a video object unit managed by this PCI.
Prohibition or permission of user operation during the display period of the knit
User operation control as information indicating
(VOBU UOP CTL), video object
Start time of unit display (VOBU S PT
M), at the end time of the display of the video object unit
Yes (VOBU E PTM). VOBU S
The first video specified by the PTM is an MPEG standard.
This is an I picture in a case. Furthermore, video
A video showing the duration of the last video in the object unit.
Video object unit sequence end pre
Presentation time (VOBU SE E PTM)
Or relative display progress since the first video frame in the cell
Cell Elapse Time (C ElTM) etc.
Is also described.

Also, NSML ANGLI indicates the address of the destination at the time of an angle change. That is, the video object unit also has images captured from different angles. Then, when the user specifies to display an image at an angle different from the currently displayed angle, the address of the VOBU to be shifted to the next reproduction is described.

The HLI is information for designating a specific area in the screen in a rectangular shape, and changing the luminance of this area, the color of the sub-picture displayed here, and the like. This information includes the Highlights General Information (HL G
I) A button color information table (BTN) for allowing the user to select a button for color selection COLIT), and a button information table (BTNIT) for the selection button.

The RECI is video, audio, and sub-picture information recorded in the video object unit, and describes what data is to be decoded. For example, the information includes a country code, a copyright holder code, and a recording date.

The DSI packet is navigation data for executing a search for a video object unit. The DSI packet contains DSI, which is general information.
General information (DSI GI) and Seamless Playback Information (SML) PBI), Seamless Angle Information (SML) AGLI), Video Object Unit Search Information (VOBU) SRI), synchronization information (SYNCI), and the like.

As shown in FIG. GI has the following
Is described. NV PCK Deco
System start reference time
Some NV PCK SCR, NV PCK logical address
(NV) PCK LBN), this NV PCK
Indicates the end address of the video object unit to which it belongs.
(VOBU EA) is described. Furthermore,
First reference picture (I picture) for decoding first
End address (VOBU1STREF) E
A) A second reference picture to decode first
(P picture) end address (VOBU 2NDR
EF EA), a third reference point for decoding first
End address (VOBU) of ture (B picture) 3
RDREF EA) is described. Furthermore, this
ID number (VOBU) to which the DSI belongs VOB
IDN) and the ID number of the cell to which this DSI belongs
(VOBU C IDN), the first video frame in the cell
Cell Elaps Time, which indicates the relative elapsed time from the
(C ElTM) is also described.

As shown in FIG. The PBI has the following
Is described. V to which this DSI belongs
OBU is an interleaved unit (ILVU)
Or indicate a video object connection, ie
Data is the reference immediately before the interleave unit
Video object indicating whether it is a pre-unit (PREU)
Project Unit Seamless Category (VOBU SM
L CAT). Also the interleaved unit
Indicates the end address (ILVU EA) Next Inter
Indicates the start address of the driven unit (ILVU S
A) indicates the size of the next interleaved unit
(ILVU SZ), in video object (VOB)
Indicates the video display start time in (VOB) V S P
TM), Video Table in Video Object (VOB)
Show end time (VOB V E PTM), video
Audio stop time within the object (VOB)
Show (VOB A STP PTM), video objects
Indicates the audio gap length in the VOB (VOB).
OB A GAP LEN). Pre-unit
(PREU) is the BO immediately before the interleave unit.
This is the last unit of the VU.

The above video object unit seam
Less category (VOBU SML CAT)
The interleave unit is
Flag indicating whether or not it is a knit, and at the end point
A flag indicating whether the unit is
Have been.

FIG. 14 shows seamless angle information (SM
L AGLI). C1 to C9 indicate the number of angles, and can indicate the address and size of the destination interleave unit even when information of up to nine angles exists. That is, the address and size (SML) of the next interleaving unit to be shifted in each angle AGL Cn DSTA) (n = 1 to
9) is described. If an angle change operation is performed by the user during viewing, this information is referred to,
The playback device can recognize the playback position of the next interleave unit.

As described above, the number of packs in the interlibrary unit can be determined based on the size. FIG. 15 is a diagram showing an overall configuration of a disk reproducing apparatus to which the present invention is applied. The signal recorded on the optical disc 600 is read by the pickup unit 601, and the read signal is sent to the data synchronous reproduction unit 603. The digital signal reproduced by the data synchronous reproduction unit 603 is sent to an ECC and demodulation unit 606, and a signal necessary for servo is sent to a servo circuit 604. The servo circuit 604 controls the disk motor 605 so that the signal from the disk 600 is reproduced at a predetermined frequency. Further, the servo circuit 604 outputs signals for performing focus control and tracking control in the pickup unit 601, and
Signal reading position is controlled.

The ECC and demodulation unit 606 performs error correction processing and data demodulation from 16 bits to 8 bits. The demodulated signal is supplied to the track buffer 607. As described with reference to FIGS. 1 and 4, the system control unit 608 controls the blocks of each unit in order to perform switching of a scene of a reproduction signal or the like according to operation information. The data output from the track buffer 607 is
09 is input. The separation unit 609 performs separation for each packet, the main video data to the main video decoder (MPEG decoder) 611, the sub video data to the sub video decoder (run length decoder) 612, and the audio data to the audio decoder (AC3). Decoder or linear PCM decoder) 613. The decoded main video data and the decoded sub video data are sent to the synthesizing circuit 614 and are synthesized as necessary.

FIG. 16 is a flowchart showing the operation of the control unit. The data is read, and it is determined whether or not the scene has been switched (steps S1 and S2). If there is no scene switching, the stream ID and the pack are detected in step S3, and the number of packs is counted up in step S4. Next, it is determined whether or not the fetched pack is NV_P.
_P, SP_P, and A_P are determined. Each pack is written to the track buffer (steps S6, S7). When the number of packs reaches the set value, the ID of the next interleave unit is set as the stream ID. For example, when all packs of unit 1 of scene 1 are captured, a stream ID is set for capturing of unit 2 of scene 1. If there is a scene change, the ID of the scene to be changed
Is set.

If it is determined in step S5 that the read pack is NV_P, it is determined in step S10 whether the read pack is the head of the interleave unit. This can be determined by the content of the information included in NV_P.

If it is not the head of the interleave unit, the old NV_P information in the register is rewritten with the new one, and the process returns to step S1. If it is the head of the interleave unit, set the number of packs. This set number is obtained, for example, from the size of the interleave unit, as previously set. Next, the write pointer is transferred to the latest unit pointer register, and also to the unit pointer register, and then the process returns to step S1.

Next, a case where a scene change is performed will be described. This is determined in step S2.
In this case, in step A1, the latest unit pointer (UP) is compared with the read pointer (R). If UP> R, read pointer (R)
Is written in the interleave unit next to the interleave unit pointed by. Therefore, in this case, the next write pointer closest to the read pointer (R) is set as the latest unit pointer (UP) (steps A2 and A3). After this setting, the scene switching instruction register is cleared, and when returning to step S1, the interleave unit of the switching destination scene can be fetched. In step A2, if the latest unit pointer (UP) is smaller than the read pointer (R), it means that writing to the interleave unit next to the interleave unit indicated by the read pointer (R) has not been performed yet. In this case, in step A5, the process waits until the latest unit pointer is obtained, and when this unit pointer is obtained, the latest unit pointer is set in the write pointer counter as the next write pointer, and the process proceeds to step A4.

[0072]

As described above, according to the present invention, the time interval from the operation time to the actual output video switching time at the time of scene switching can be shortened as much as possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of multi-scene configuration information recorded on a disc for explaining the operation of the apparatus of FIG. 1;

FIG. 3 is an explanatory diagram showing an example of a data state in a track buffer for explaining the operation of the device of the present invention.

FIG. 4 is a diagram showing another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a data structure in a volume space of a DVD disk.

FIG. 6 is an explanatory view further showing a data structure of a DVD.

FIG. 7 is a diagram hierarchically showing a data structure of a video object set in a DVD.

FIG. 8 is a view showing a video pack of a video object unit.

FIG. 9 is an explanatory diagram of an interleave unit and an interleave block.

FIG. 10 is an explanatory view showing a pack structure.

FIG. 11 is a diagram showing a data configuration of a navigation pack (NV_P).

FIG. 12 is an explanatory diagram for explaining DSI general information in NV_P.

FIG. 13 is an explanatory diagram for explaining seamless playback information in NV_P.

FIG. 14 is an explanatory diagram for explaining seamless angle information in NV_P.

FIG. 15 is a diagram showing an overall block configuration of a disc reproducing apparatus to which the present invention is applied.

FIG. 16 is a diagram showing still another embodiment of the present invention.

[Explanation of symbols]

100: track buffer, 110: memory address generator, 201: write pointer processing unit, 202: read pointer processing unit, 203: unit pointer processing unit, 204: system control unit, 401: input buffer,
402 ... NVP detector, 403 ... ID detection and control circuit, 405 ... Timing generator, 406 ... Output buffer, 407 ... Host interface, 408 ... Host computer, 411 ... Write pointer counter, 4
12: read pointer, 413: ring counter, 5
01: latest unit pointer, 502: unit pointer, 503: write pointer jump determiner.

Claims (3)

[Claims] 1. A data processing method for selectively extracting unit data of a first channel from a data string in which unit data of a plurality of channels are interleaved, writing the unit data in a buffer, and reading the data written in the buffer. A position where data is sequentially written in the buffer as a write pointer; a position where data in the buffer is read as a read pointer; and data to be written to the buffer is the first data or the last data of the unit data. There is a pointer position storing means for holding at least one position as a unit pointer, and when an instruction to take in data of the second channel into the buffer is input, the pointer is stored in the write pointer, the read pointer, and the pointer position storing means. When the relation between the write pointer and the read pointer is a predetermined condition, the position indicated by the write pointer is rewritten to the position indicated by the unit pointer, and the rewritten unit pointer is referred to. Wherein the unit data of the second channel is written to the buffer from the position indicated by (1). 2. A control unit for selectively extracting unit data of a first channel from a data string in which unit data of a plurality of channels are interleaved, writing the unit data in a buffer, and reading the data written in the buffer, Write pointer processing means for indicating a position at which data is sequentially written in the buffer as a write pointer; read pointer processing means for indicating a position at which data in the buffer is to be read as a read pointer; A unit pointer storing means for storing at least one write position when the data is the first data or the last data as a unit pointer; and when an instruction to take in data of the second channel into the buffer is input, the write pointer A pointer, a read pointer, and at least one unit pointer stored in the unit pointer storage means, and when the relationship between the units of the write pointer and the read pointer is a predetermined condition, the position indicated by the write pointer And a system control unit for rewriting the unit data stored in the unit pointer storage unit to the position indicated by the unit pointer, and writes the unit data of the second channel from the address position indicated by the rewritten unit pointer to the buffer. A data processing device characterized in that: 3. The read pointer is closest to the read pointer and newer than the read pointer when the read pointer indicates the position of the succeeding (temporal past) position of the buffer as compared with the latest one of the unit pointers. When the position indicated by the unit pointer is replaced with the position indicated by the next write pointer, and when the read pointer indicates the preceding (temporally new) position of the buffer as compared with the latest unit pointer, 2. The data processing method according to claim 1, wherein a position indicated by said next unit pointer is replaced by a position indicated by a next write pointer.