JPH10271449A - Data reproducing device and data reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the data reproducing device and the data reproducing method where a normally reproduced image is obtained through a normal angle switching even when a plurality of multi-angle blocks are stored in a track buffer. SOLUTION: On the occurrence of an angle switching event, when a non- seamless angle block is reproduced at a presentation side, a controller 11 executes non-seamless angle switching, when a nonseamless angle block is reproduced at the presentation side, a track buffer 4a terminates event processing of the angle switching. When a non-seamless angle block is not reproduced at the presentation side, the seamless angle switching is executed at the arrival of a border of an interleaved unit(ILVU) during reading of the seamless angle, and when the angle switching point is recognized at the presentation side, the event processing of an angle switching is controlled so as to terminate the angle switching event processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to PGC information (PGCI: PGCI) describing the essence and order of presentation.
C Information), an integer number of programs (P
Program chain (PG) composed of G: Program
DVD (Digital Vers) recorded with C: Program Chain
The present invention relates to a data reproducing apparatus and a data reproducing method for reproducing PGCI from a recording medium such as atile Disc / Digital Video Disc) and reproducing PGC based on PGCI.

[0002]

2. Description of the Related Art Digital video and digital audio signals are compressed and coded, and
The PEG (Motion Picture coding Experts Group) method has been proposed. In addition, a DVD-Video format has been proposed as a method for compressing and encoding digital images and digital audio signals by using the MPEG method, multiplexing the signals, recording the signals on an optical recording medium, and reproducing the signals.

In a DVD-VIDEO disc, multiplexed streams of a plurality of channels such as a video data stream for main video, an audio data stream for audio, and a sub-picture stream such as subtitles are recorded by a packet multiplexing method. Like that. Then, image information having different camera angles is transferred to a plurality of interleaved units (ILVUs).
By recording as a multi-angle block interleaved by dividing into multiple channels, by selectively reproducing it, one of a plurality of channels or streams existing at the same time is arbitrarily selected and reproduced. Further, an angle function for switching a channel to be reproduced during reproduction, that is, a stream is realized.

[0004]

That is, a DVD-V
The volume structure of an IDEO disk is defined as shown in FIG.
-Video manager with one VIDEO zone (VMG: V
video title set (VTS: Video Manager) and one to 99 video title sets (VTS). V
The MG is located at the head of the DVD-VIDEO zone,
It consists of two or three files. VTS is 3
It consists of at least 12 files.

FIG. 2 shows the structures of VMG and VTS. VM
For G, the first file is the control data (VMGI: Vi
deo Manager Information), and the following file is a VOBS for menu (VMGM_VOBS: VMGM Video Obje)
ct Set), and the last file is a VMGI backup. VMGI is available in the VMG menu (VMG
M: VMG Menu) and one or more VTSs.

In the VTS, the first file is control data (VTSI: Video Title Set Information), and the next file is a VOBS (VTSM) for menu.
_VOBS: VTSM Video Object Set), and the next 1 to 9 files are VOBS (VTSTT_
VOBS: VTSTT Video Object Set), and the last file is a VTSI backup. VTSI
Is a VTS menu (VTSM: Video Titl)
e Set Menu) and one or more titles (TT: Title).

Here, a video object set (VOB
As shown in FIG. 3, an S: Video Object Set is composed of one or more video objects (VOBs). VOB ID number (VOB_IDN: VOB ID number)
Is the smallest logical sector number (LSN: Log) in the VOBS.
ical Sector number). V
The OB is composed of one or more shells (Cell). Shell I
The D number (C_IDN: Cell ID number) is the smallest logical sector number (LSN) in the VOB.
Assigned from the shell. Also, shell (Cell)
Is an integer number of video object units (VOBU: Vide
o Object Unit). The VOBU includes an integer number of audio packs (A_PCK: Audio Pack), video packs (V_PCK: Video Pack), and sub-picture packs (S
P_PCK: Sub-picture Pack) and a navigation pack (NV_PCK: Navigation Pack) arranged at the head of the P_PCK.

[0008] VOBs in VOBS include a contiguous block (CTGB) and an interleaved block (ILVB). The CTGB is a VOB in units of one positioned adjacent to each other as shown in FIG. Further, as shown in FIG. 5, the ILVB includes a plurality of interleaved VOBs.
Consists of Each BOV in ILVB includes a plurality of interleaved units (ILVUs).
t) is divided.

Further, as shown in FIG. 6, the NV_PCK includes a pack header, a system header, and a PCI packet (PCI_PKT: Presentation Control Information pack).
et) and DSI packet (DSI_PKT: Data Search Infor)
mation packet). Presentation control information (PCI: Present
ation Control Information) is navigation data for controlling the presentation of the VOBU. As shown in FIG. 7, the PCI includes PCI general information (PCI_GI) and non-seamless angle information (NSML_AGLI).
for non-seamless), highlight information (HLI: Highligh)
t Information) and recording information (RECI: Record)
ing Information). PCI_GI
Is the logical block number of the navigation pack (NV_PCK_LBN: Logical Block number of Navigation P), as shown in FIG.
ack), VOBU category (VOBU_CAT: Category of
VOBU), user operation control of VOBU (VOBU_UOP_CTL:
User Operation control of VOBU), VOBU presentation start time (VOBU_S_PTM: Start Presenta)
tion Time of VOBU), VOBU presentation end time (VOBU_E_PTM (End PTM of VOBU),
Presentation end time of sequence in VOBU (VOBU_SE_E_PTM: End PTM of sequence in VOBU)
And information such as shell elapsed time (C_ELTM: Cell Elapse Time). Further, NSML_AGLI is switching destination information in angle switching as shown in FIG. 9, and is valid only for non-seamless angle shell switching.

Further, data search information (DSI: Data Search Information) given as the DSI packet is provided.
Is navigation data for performing seamless playback and search of the VOBU. This DCI is, as shown in FIG. 10, DSI general information (DSI_GI: DSI General In).
formation), seamless playback information (SML_PBI: Seamless)
Playback Information), Seamless Angle Information (S
ML_AGLI: Angle Information for seamless), VOB
U search information (VOBU_SRI: VOB Unit Search Informatio
n) and synchronous information (SYNCI: Synchronous Information). DSI_GI is, as shown in FIG. 11, NV_PCK_SCR (SCR_System Clock Ref).
erence of Navigation Pack), NV_PCK_LBN
(Logical Block number of Navigation Pack), VO
BU_EA (End address of VOBU), VOBU_1S
TREF_EA (End address of the first Reference
Picture in VOBU), VOBU_2NDREF_EA
(End address of the secnd Reference Picture in VO
BU), VOBU_3RDREF_EA (End address of
the third Reference Picture in VOBU), VOBU_
VOB_IDN (VOB ID number of VOBU), VOBU
_C_IDN (Cell ID number of VOBU) or C_EL
Information such as TM (Cell Elapse Time). here,
VOBU_1 STREF_EA, VOBU_2ND
As shown in FIG. 12, REF_EA and VOBU_3RDREF_EA are relative logical block numbers (RLBN: Relative Logical Block number) from the first logical block (LB: Logical Block) LB of the VOBU of the DSI packet.
Is a video pack (V_PCK: Video pack) recorded after the DSI packet, and the address of the video pack of the last data of the reference image (first I picture) to be encoded first is VOBU_1STREF_
EA indicates the address of the video pack of the final data of the reference image (P picture) to be encoded next, VOBU
—2NDREF_EA indicates the address of the video pack of the final data of the reference image (P picture) to be encoded next, and VOBU_3RD_EA indicates the address.

The SML_PBI is, as shown in FIG. 13, a seamless VOBU category (VOBU_SML).
_CAT: Category of seamless VOBU), end address of interleave unit (ILVU: Interleaved Unit) (ILVU_EA: End Address of Interleaved Unit), start address of next ILVU (NXT_ILVU_SA: Start address)
of the next Interleaved Unit), the size of the next ILVU (NXT_ILVU_SZ: Size of the next Interleaved Uni)
t), presentation start time of video in VOB (VOB_V_S_PTM: Video Start PTM in VOB), VO
B video presentation end time (VOB_
V_E_PTM: Video End PTM in VOB, audio presentation stop time in VOB (VOB_A_STP_PT)
M: Audio Stop PTM in VOB and audio gap length in VOB (VOB_A_GAP_LEN: Audio Gap Length in)
VOB).

Further, the SML_AGLI is shown in FIG.
This is information of the switching destination in the angle switching as shown in (1), and is valid only for seamless angle shell switching.

On a DVD-Video disk, a program chain (PGC: Pro
gram Chain) structure, and PGC information (PGCI: PGCI) describing the essence and order of the presentation.
C Information) based on an integer number of programs (P
Program chain (PG) composed of G: Program
C: Program Chain).
The PGC is a logical unit that provides a menu or a title or a part thereof, and is configured based on the PGCI. One PGC is divided into an integer number of PGs.
PG is a unit obtained by dividing the content of PGC, and one P
G is composed of an integer number of shells (Cell). DVD-VI
The playback device of the DEO disk plays the PGCI,
Play PGC based on PGCI. PG is PGC
A collection of shells (Cells) defined in I.
The PGCI includes a pre-command area, a post-command area, and a presentation control block. The presentation control block provides navigation data for controlling the playback order of the shell and the VOB presentation.

The PGCI is, as shown in FIG.
General GC information (PGC_GI: Program Chain General Inform)
ation), PGC command table (PGC_CMDT: Program
Chain Command Table), PGC Program Map (PG
C_PGMAP: Program Chain Program Map, shell playback information table (C_PBIT: Cell Playback Information Table)
), Shell position information table (C_POSIT: Cell Positio)
n Information Table).

As shown in FIG. 17, the contents of PGC_GI include PGC contents (PGC_CNT: PGC Contents),
GC playback time (PGC_PB_TM: PGC Playback Time), P
GC user operation control (PGC_UOP_CTL: PGC Use Operation)
Control), a PGC audio stream control table (PGC_AST_CTLT: PGC Audio stream Control Table),
PGC sub-picture stream control table (PGC_SPST
_CTLT: PGC Sub-picturestream Control Table), PG
C navigation control (PGC_NV_CTL: PGC Navigation C
ontrol), PGC sub-picture palette (PGC_SP_PLT:
PGC Sub-picture Palette), PGC_CMDT start address (PGC_CMDT_SA: Start address of PGC_CMDT)
_SA), the start address of PGC_PGMAP (PGC_P
GMAP_SA: Start address of PGC_PGMAP), PGC_P
BIT start address (C_PBIT_SA: Start address)
of C_PBIT) and the start address of PGC_POSIT (C_POSIT_SA: Start address of C_POSIT).

The C_PBIT is a table that defines the order of presentation of shells (Cells) in the PGC. As shown in FIG. 18, shell playback information (C_PBI: Cell Playback Information) is continuously described. ing. As shown in FIG. 19, the C_PBI is a shell category (C_CAT: Cell Categor).
y), shell playback time (C_PBTM: Cell Playback Tim)
e), start address of the first VOBU of the shell (Cell) (C
_FVOBU_SA: Start address of the First VOBU in Cel
l), end address of the first VOBU of the shell (Cell) (C
_FVOBU_EA: End address of the First VOBU in Cel
l :), Start address of the last VOBU of the shell (Cell) (C_LVOBU_SA: Start address of the Last VOBU in Ce)
ll), the end address of the last VOBU of the shell (Cell) (C_LVOBU_SA: End address of the Last VOBU in Cel)
l :)

As described above, in the DVD-VIDEO disc, two types of data, ie, navigation data, ie, reproduction control data, and presentation data, ie, data for reproducing video, audio, sub-pictures, etc., are recorded in the DVD-VIDEO zone. Have been.

Further, in such a DVD-VIDEO disc reproducing apparatus, a first play domain (FP) generated by a special entry PGC executed at the time of initial access such as after power-on or disc loading.
_DOM: First Play Domain), a VMG menu domain (VMG_DOM: VMG Menu Domain) used for each language in the title menu, a root menu,
The VTS menu domain (VTSM menu) used for each VTS and each language that appears in the PTT menu, audio menu, sub-picture menu, and angle menu
_DOM: VTS MenuDomain, and a title domain used for each VTS and each title (TT_DOM: Title Doma)
In), four types of domains are defined, and transition between the domains can be made in response to a navigation command or a user operation input. In the state transition due to the user's operation input, as shown in FIG.
There is no transition between OM and OM, and a stop state, VMGM_DOM and VTSM_DOM according to the command.
And TT_DOM transition as follows. VMGM
Transition to _DOM or VTSM_DOM is menu ID
This is caused by a Menu_Call () command for instructing the start of execution of the entry PGC of the menu specified by the command. The transition to the stop state is caused by a Stop () command instructing to stop the reproduction of the PGC, and in VMGM_DOM and VTSM_DOM, Resum instructing the return to the resume position.
It is also caused by the e () command. Also, TT_DOM
The transition to is performed by a Title_Play () command instructing the start of reproduction of the title specified by the title number, a PTT_Play () command instructing the start of reproduction of the title specified by the PTT (Part_of_Title) number, and the title specified by the time. This is caused by a Time_Play () command for instructing the start of playback of.

Here, the DVD-VIDEO disc reproducing apparatus is equipped with a memory called a track buffer in order to realize variable rate reproduction, and reproduces reproduced data recorded on the disc for a multi-angle function or the like. The above memory absorbs the time for the pickup to read only the data necessary for the reproduction of the video and audio selected by the user while the track jumps, thereby connecting, for example, simultaneously progressing video of different angles without a break. To perform seamless playback.

In the angle function of the DVD, a seamless angle stream and a non-seamless angle stream are defined. In the non-seamless angle stream, the angle, that is, the stream switching process, that is, from the issuance of the switching command from the user, is designated. Reproduction of a new angle starts in a relatively short time, but reproduction of video, audio, and subtitles is temporarily stopped during switching, and intermittent reproduction is performed at the time of switching. This is called non-seamless angle switching processing. In contrast, in a seamless angle stream, a time relationship is maintained between streams having different angles,
Even if the angle is switched, a continuous reproduction output maintaining the time relationship can be obtained. Since seamless angle switching is performed using a track buffer, a relatively long time is required from when a switching command is issued by a user to when reproduction of a specified new angle starts.

As described above, in the angle function of the DVD, there is a seamless angle stream and a non-seamless angle stream. For example, if the angle is switched while the non-seamless angle block exists in the track buffer, the track buffer is If the information of the non-seamless angle block in the block is read out after the occurrence of the angle switching event, and the event is processed only by the subject of the angle switching, the past angle may be visible.

Therefore, an object of the present invention is to provide a data reproducing apparatus capable of performing normal angle switching to obtain a normally reproduced image even when a plurality of multi-angle blocks are contained in a track buffer. And a data reproducing method.

[0023]

According to the present invention, image information having different angles is stored in a plurality of interleaved units (ILVs).
U: Video Object Unit (VOBU) divided into Interleaved Units and interleaved
nit) includes a program chain (PG) composed of an integer number of programs (PG: Program) based on PGC information (PGCI Information) describing the essence and order of the presentation. A data reproducing apparatus that reproduces PGC based on PCI from a recording medium recorded as PGC (Program Chain). When an angle switching event occurs, a non-seamless angle block is reproduced on the presentation side if a non-seamless angle block is being reproduced. Execute angle switching, and on the track buffer side, end the event processing of angle switching if the non-seamless angle block is being reproduced on the presentation side, and seamlessly if the non-seamless angle block is not being reproduced on the presentation side. Angle reading event processing is performed such that seamless angle switching is performed when the ILVU boundary is reached during angle reading, and the angle switching event processing is terminated when the presentation side recognizes the angle switching point. It is characterized by comprising control means for performing control.

Further, according to the present invention, image information having different angles is stored in a plurality of interleaved units (ILVU: Interleaved Unit).
image information of a shell structure composed of a plurality of VOBUs including a video object unit (VOBU: Video Object Unit) divided and interleaved into ved units based on PGC information (PGCI: PGC Information) describing the essence and order of presentation. A PGC based on PCI from a recording medium recorded as a program chain (PGC: Program Chain) composed of an integer number of programs (PG: Program), wherein an angle switching event occurs. Sometimes, the presentation side performs non-seamless angle switching if the non-seamless angle block is being played, and the track buffer side ends the angle switching event processing if the presentation side is playing the non-seamless angle block, Step If it is not in play non-seamless angle block presentation side, ILV reading the seamless angle
When the boundary of the U is reached, seamless angle switching is executed, and when the angle switching point is recognized on the presentation side, the event processing of the angle switching is terminated.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

The present invention is applied to, for example, an optical disk reproducing apparatus 100 having a configuration as shown in FIG. The optical disc reproducing apparatus 100 is a DVD-Video disc reproducing apparatus to which the present invention is applied, and includes a pickup 2 for reproducing an RF signal from a recording medium 1 on which data according to a DVD format is recorded, and a pickup 2 for reproducing the RF signal. An RF circuit 3 to which an RF signal reproduced by the pickup 2 is supplied and which performs a binarization process and the like of the RF signal; a data decoder 4 which is supplied with reproduction data from the RF circuit 3 and performs a decoding process such as error correction; A demultiplexer 5 for distributing the reproduction data decoded by the data decoder 4 into main video compression data, sub-video compression data, and audio compression data.

This optical disc reproducing apparatus 100
A video decoder 6 for expanding the compressed main video data,
A sub-picture decoder 7 for expanding the sub-picture compressed data and synthesizing it with the main video data, an audio decoder 8 for expanding the audio compressed data, and the main picture data and sub-picture data from the sub-picture decoder 7 are synthesized. A digital / video converter which receives video data and converts it into an NTSC signal or a PAL signal
An NTSC / PAL conversion circuit (hereinafter simply referred to as an NTSC conversion circuit) 9 and a digital / analog conversion circuit (hereinafter simply referred to as an A / D conversion circuit) to which audio data from the audio decoder 8 is supplied and converted into an analog signal. 10 is provided.

The DVD reproducing apparatus 100 includes a pickup 2, an RF circuit 3, a data decoder 4, a demultiplexer 5, a video decoder 6, a sub-picture decoder 7, an audio decoder 8, an NTSC conversion circuit 9, and an A / D conversion circuit. The controller 11 includes a controller 11 that controls the controller 10, a user interface 12 that mediates operation inputs of the controller 11 and a user, and a memory 13 that serves as a data storage unit of the controller 11.

The optical disk reproducing apparatus 100 reproduces a read-only, write-once, rewritable, etc. DVD disk and DVD-VIDEO disk as the recording medium 1.

The pickup 2 reproduces an RF signal from the recording medium 1 and supplies the RF signal to the RF circuit 3.

The RF circuit 3 generates digital data and a synchronizing signal thereof by performing waveform equalization and binarization of the RF signal. Digital data and the like generated by the RF circuit 3 are supplied to a data decoder 4.

The data decoder 4 performs processes such as data demodulation and error correction based on the digital data generated by the RF circuit 3. Digital data demodulated by the data decoder 4 is supplied to a demultiplexer 5.

In the data decoder 4, the MPE
Parameter information included in the system header and pack header in the G2 format and the navigation pack (NV_PCK: Navigation) in the DVD format
Pack) is detected. The detected parameter information and the like are supplied from the data decoder 4 to the controller 11.

The data decoder 4 has a track buffer at the output stage of digital data. The difference in processing speed between the data decoder 4 and the demultiplexer 5 is absorbed by the track buffer.

The demultiplexer 5 includes a data decoder 4
Divides the digital data reproduced from the recording medium 1 subjected to the error correction decoding processing and the like into compressed main video data, compressed sub-video data, and compressed audio data.

Here, the main video compression data is MPEG data.
2 is video data compressed by a method such as DVD
Video streams in the format of. The sub-picture compressed data is data such as subtitles to be combined with the main picture, and is, for example, Sub-picture streams in the DVD format.
The audio compressed data is audio data compressed by a method such as MPEG2 or the like.
audio streams.

The demultiplexer 5 supplies the main video compression data to the video decoder 6, supplies the sub video compression data to the sub video decoder 7, and supplies the audio compression data to the audio decoder 8.

The video decoder 6 performs a decoding process of the main video compression data, and generates expanded main video data by the decoding process. The video decoder 6 has an image memory for three screens for performing a decoding process. That is, using the image memory for these three screens,
I picture, P picture, B in format 2
The picture is decoded on the memory, and each decoded picture is output from the memory. This image memory is not limited to three screens, but may have more screens. The video decoder 6 supplies the generated main video data to the sub video decoder 7.

The sub-picture decoder 7 decodes the sub-picture compressed data, and combines the decoded sub-picture data with the main picture data supplied from the video decoder 6 to generate picture data. That is, the sub-picture decoder 7 combines subtitle data and the like reproduced as sub-picture data with the main video. When there is no sub-video data, the sub-video decoder 7 outputs the main video data as it is as video data. The sub-video decoder 7 supplies the generated video data to the NTSC conversion circuit 9.

The audio decoder 8 decodes the compressed audio data to generate expanded audio data. That is, the audio decoder 8 determines that the audio compression data is M
If the data is compressed in the PEG2 format, the audio data is generated by performing a corresponding expansion process. In addition,
If it is a format such as PCM in addition to the MPEG2 format, processing corresponding to the format is performed. The audio decoder 8 supplies the generated audio data to the A / D conversion circuit 10.

The NTSC conversion circuit 9 converts the video data from digital data into a television signal such as NTSC or PAL and outputs it. By supplying this output to a monitor or the like, the user can view the video reproduced from the recording medium 1.

The A / D conversion circuit 10 converts digital audio data into analog audio data and outputs the analog audio data. By supplying this output to a speaker or the like, the user can view the video reproduced from the recording medium 1.

The controller 11 has a pickup 2, R
It controls the F circuit 3, data decoder 4, demultiplexer 5, video decoder 6, sub-picture decoder 7, audio decoder 8, NTSC conversion circuit 9, and A / D conversion circuit 10.

The controller 11 receives an operation input via an operation panel or a user interface 12 which is a remote controller, and controls each circuit based on the operation input.

The controller 11 stores each control data and the like in the memory 13 and controls each circuit based on the data stored in the memory 13. That is, in the optical disc reproducing apparatus 100, the controller 11 performs PGC information (PGCI: PGC Informatio) describing the essence and order of the presentation reproduced from the recording medium 1.
n), an integer number of programs (PG: Program)
Program chain (PGC: Program C)
In controlling the decoder 4 to reproduce the H.sub.hain), the reproduced PGCI is held in the cache area of the memory 13, and when the PGCI of the PGC to be reproduced is held in the cache area, the cache area is stored. The decoder 4 is controlled so that the PGC is reproduced by the PGCI held in the.

The controller 11 controls the seamless angle (SML_AGL: Seamless) on the track buffer 4a side.
Angle) Switching operation and non-seamless angle on the presentation side (NSML_AGL: Non-seamless Angle)
e) The switching operation is controlled as follows.

For the presentation side performing the NSML_AGL switching operation, when an angle switching event occurs, the controller 11 performs control as shown in the flowchart of FIG. That is, in step S1, the presentation side uses NSML_A
At point B where GL switching is performed, the current non-seamless angle block (NSML_AGL_BLK: Non-seamless Angle)
Block) is being reproduced.

When the result of the determination in step S1 is "N
O ", that is, if the NSML_AGL_BLK is not reproduced, the processing of this step S1 is performed by the NSML_AG
The determination is repeatedly performed until L_BLK is sent, and the determination result in step S1 is “YES”, that is, NSM
When the reproduction operation of L_AGL_BLK starts, it is determined whether or not the angle number (AGLN: Angle number) last designated by the user and the AGLN being reproduced are the same (step S2).

When the result of the determination in step S2 is "N
O ”, that is, the angle number specified by the user (AGLN: An
If the AGLN being reproduced is different from the AGLN being reproduced, the process proceeds to step S3 to perform NSML_AGL switching processing, and the determination result in step S2 is "YES", that is, the angle number (AG
If LN (Angle number) and the AGLN being reproduced are the same, the process returns to step S1 without performing the NSML_AGL switching process. NSML_A in step S3 above
In the GL switching process, the image is stopped, back-cleared, and the search destination is changed to the angle number (AGLN: Angle number) last designated by the user.

When an angle switching event occurs on the track buffer 4a that performs the SML_AGL switching operation, the controller 11 performs control as shown in the flowchart of FIG. That is,
In step S11, the presentation side sets NS.
At point B where ML_AGL switching is performed, the current NSM
It is determined whether or not L_AGL_BLK is being reproduced.

If the decision result in the step S11 is "YES", that is, NSML_AGL_B
If the LK is being reproduced, the event process ends without performing the SML_AGL switching process. If “NO” in step S11, that is, if NSML_AGL_BLK is not reproduced at point B,
The process proceeds to step S12, where S is
Seamless angle block at point A where ML_AGL switching operation is performed (SML_AGL_BLK: Seamless Angle Bl
ock) is being read.

If the decision result in the step S12 is "NO", that is, if SML_AGL_BLK has not been read, the decision processing in the step S12 is made NS.
The determination is repeatedly performed until ML_AGL_BLK is sent, and the determination result in step S12 is “YES”.
That is, when the reading of NSML_AGL_BLK starts, the process proceeds to step S13, and it is determined whether or not the boundary of an interleaved unit (ILVU: Interleaved Unit) has been reached.

If the result of the determination in step S13 is "NO", that is, if the boundary of ILVU is not reached, the determination processing of step S13 is repeated until the boundary of ILVU is reached, and the result of determination in step S13 is "YES". That is, when the boundary of the ILVU is reached, the process moves to step S14 to perform the SML_AGL switching process.

SML_AG in step S14
In the L switching process, the reading destination is changed to an angle number (AGLN: Angle number) specified last by the user.

In the next step S15, the process of determining whether or not the angle switching point has been recognized at point B on the presentation side is repeated, and the determination result is "YES", that is, the angle switching point is recognized at point B. Then, the event processing ends.

As described above, the seamless angle (SML_AG
L: Seamless Angle) Processing on the track buffer 4a side that performs switching operation and non-seamless angle (NSML_AG)
L: Non-seamless Angle) Handshake the process on the presentation side that performs the switching operation. When an angle switching event occurs, the non-seamless angle switching is executed on the presentation side if the non-seamless angle block is being played on the presentation side, and the track buffer side Then, if the non-seamless angle block is being reproduced on the presentation side, the angle switching event processing is terminated. If the non-seamless angle block is not being reproduced on the presentation side, the boundary of the ILVU has been reached during reading the seamless angle. By executing seamless angle switching at the point in time, and ending the angle switching event processing when the presentation side recognizes the angle switching point,
Even when a plurality of multi-angle blocks are included in the track buffer, it is possible to normally perform angle switching and obtain a normally reproduced image.

[0057]

In the data reproducing apparatus and the data reproducing method according to the present invention, the processing on the track buffer 4a for performing the seamless angle switching operation and the processing on the presentation side for performing the non-seamless angle switching operation are hand-shake, so that the track buffer is provided. Even if a plurality of multi-angle blocks are included in the image, it is possible to normally perform angle switching and obtain a normally reproduced image.

[Brief description of the drawings]

FIG. 1 is a diagram showing a volume structure of a DVD-Video disk.

FIG. 2 is a diagram showing a structure of VMG and VTS in the volume structure.

FIG. 3 is a diagram showing a configuration of a VOBS.

FIG. 4 is a diagram showing a continuous block CTGB.

FIG. 5 is a diagram showing an interleaved unit ILVU.

FIG. 6 is a diagram showing a configuration of a navigation pack NV_PCK.

FIG. 7 is a diagram showing a configuration of presentation control information PCI.

FIG. 8 is a diagram showing a configuration of PCI overall information PCI_GI.

FIG. 9 is a diagram showing a state of angle switching by NSML_AGLI.

FIG. 10 is a diagram showing a configuration of data search information DSI.

FIG. 11 is a diagram showing a configuration of DSI general information DSI_GI.

FIG. 12 shows VOBU_1STREF_EA, V of DSI.
OBU_2NDREF_EA and VOBU_3RDRE
It is a figure which shows the content instruct | indicated by F_EA.

FIG. 13 is a diagram showing a configuration of SML_PBI.

FIG. 14 is a diagram showing a state of seamless angle shell switching by SML_AGLI.

FIG. 15 is a diagram showing a program chain PGC structure adopted in a DVD-Video disk.

FIG. 16 is a diagram showing a configuration of a PGCI.

FIG. 17 is a diagram showing a configuration of PGC_II.

FIG. 18 is a diagram illustrating a configuration of C_PBIT.

FIG. 19 is a diagram showing a configuration of C_PBI.

FIG. 20 is a diagram showing a state transition between domains in response to a user's operation input in a DVD-VIDEO disc reproducing apparatus.

FIG. 21 is a block diagram illustrating a configuration of an optical disk reproducing device to which the present invention has been applied.

FIG. 22 is a flowchart showing a control procedure of non-seamless angle switching on the presentation side by the controller when an angle switching event occurs in the optical disc reproducing apparatus.

FIG. 23 is a flowchart showing a control procedure of seamless angle switching on the track buffer side by the controller when an angle switching event occurs in the optical disc reproducing apparatus.

[Explanation of symbols]

1 recording medium, 2 pickup, 3 RF circuit 3, 4
Data decoder, 5 demultiplexer, 6 video decoder, 7 sub-picture decoder, 8 audio decoder, 9 NTSC conversion circuit, 10 A / D conversion circuit, 1
1 controller, 12 user interfaces,
13 memory, 100 optical disk reproducing device

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takayuki Ishida 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (2)

[Claims] 1. A plurality of VOBUs including a video object unit (VOBU) in which image information having different angles are divided into a plurality of interleaved units (ILVUs) and interleaved.
PGC information (PGCI: PGC In) which describes the essence and order of the presentation
(PG: Progr)
am) (PGC: Progr)
a PGC based on PCI from a recording medium recorded as a non-seamless angle block when a non-seamless angle block is being reproduced on the presentation side when an angle switching event occurs. If the presentation buffer is playing back non-seamless angle blocks on the track buffer side, the event processing of angle switching is terminated.If the presentation side is not playing back non-seamless angle blocks,
During the seamless angle reading, the seamless angle switching is executed when the ILVU boundary is reached, and when the angle switching point is recognized on the presentation side, the angle switching event processing is completed so that the angle switching event processing is terminated. A data reproducing device comprising a control unit for controlling the data reproduction. 2. A plurality of VOBUs including a video object unit (VOBU) in which image information having different angles is divided into a plurality of interleaved units (ILVUs) and interleaved.
PGC information (PGCI: PGC In) which describes the essence and order of the presentation
(PG: Progr)
am) (PGC: Progr)
This is a data reproducing method for reproducing PGC based on PCI from a recording medium recorded as am Chain), and when an angle switching event occurs, a non-seamless angle switch is performed on the presentation side if a non-seamless angle block is being reproduced. When the non-seamless angle block is being played back on the presentation side, the angle switching event processing is terminated on the track buffer side, and the seamless angle is being read unless the non-seamless angle block is being played back on the presentation side. The seamless angle switch is executed when the ILVU boundary is reached, and the angle switch event processing is terminated when the angle switch point is recognized on the presentation side. Method.