JP2005346775A - Playback device and playback method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a playback device and a playback method, in which the combination of a cell and the corresponding cell control information can be easily recognized, without performing the FIFO management by a stream separation part in a PE, by adding identification number to cell playback information (C_PBI) to perform packing and by embedding it into a stream. <P>SOLUTION: There are provided: a first reading means for reading the cell playback information (C_PBI) from a management area of a recording medium, by the unit of one piece of object data; a packing means for performing the packing by providing the identification number to the cell playback information read by the reading means; a second reading means for reading the cell from a data area of the recording medium, by the unit of one piece of object data; a providing means for providing a cell playback information pack packed by the packing means to the head of each cell of the object data read by the second reading means; and a playback means for reproducing the information of each cell of the object data following the pack, using the cell playback information in the cell playback information pack. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a playback apparatus and playback method for playing back a DVD video.

  Conventionally, in a playback apparatus for playing back DVD video, VOBU still or STC discontinuous seamless playback processing is essential. (Patent Document 1) When performing these processes, it is necessary to acquire reproduction information for each cell (DVD stream reproduction unit). This cell playback information is included in the management information (VTSI), acquired by the navigation manager NM (VMGI, VTSI, navigation pack management part, host), and presents information (Cell_playback_flag, Seamsess_playback_flag, etc.) necessary for playback control. It is necessary to set the engine PE (part for decoding the DVD stream). However, since the cell and the cell reproduction information are separately described on the disc, the PE needs a means for recognizing the combination of the cell and the corresponding cell control information.

As a conventional method,
(1) The NM sets the combination of the cell head address in the track buffer and the cell control information in the PE.

(2) The NM inserts marker data at the head of a cell in the stream, and sets cell control information in the PE.

In any case, in order for the PE to associate the cell with the cell control information, the combination of the cell head recognition information and the cell control information needs to be managed by the FIFO.
JP2003-230089

  According to the present invention, the stream separation unit in the PE can easily recognize the combination of the cell and the cell reproduction information corresponding to the cell without performing FIFO management.

  The present invention has a data area and a management area in which management data for managing the data in the data area is recorded. In the data area, data is divided into a plurality of program chains and each program chain is recorded. Management of the recording medium in a reproducing apparatus for reproducing data from a recording medium recorded in a hierarchical structure in which one object data consists of a plurality of cells, and one cell consists of a plurality of packs. First reading means for reading cell reproduction information (C_PBI) in one object data unit from the area, packing means for packing the cell reproduction information read by the first reading means with an identification number, and the recording medium Second reading means for reading one object data unit cell from the data area of the second data area; The adding unit for adding the cell reproduction information pack packed by the packing unit to the head of each cell of the object data read by the reading unit, and the cell reproduction information in the cell reproduction information pack. And reproducing means for reproducing information of each cell of the object data following.

  The present invention relates to a playback apparatus for playing back a recording medium in which management information including cell playback information is recorded and a DVD stream to be played back in units of cells composed of a plurality of packs in which data is recorded. Means for reading management information and cells of the DVD stream from the recording medium, means for acquiring cell reproduction information from the read management information, and means for packing the acquired cell reproduction information with an identification number Means for adding the packed cell reproduction information to the head of the cell of the DVD stream read by the reading means and writing it to the track buffer; reading the DVD stream from the track buffer; and reading the read data according to the identification number From a pack containing cell playback information and a stream separation means for separating other data packs It is intended to be made.

  As described above in detail, according to the present invention, the cell reproduction information (C_PBI) is added with an identification number to be packed and embedded in the stream, so that the stream separation unit in the PE can perform cell management without performing FIFO management. It is possible to easily recognize the combination of cell reproduction information corresponding to this.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration at the time of DVD video playback according to the present invention, FIG. 8 is a diagram showing a stream structure of DVD video, and FIG. 9 is a diagram showing a position of cell playback information (C_PBI).

  As shown in FIG. 8, the volume space is composed of a volume and file configuration zone, a DVD video zone, and other zones. In the volume and file configuration zone, a UDF bridge configuration is described, and the data can be read by a computer of a predetermined standard. The DVD video zone has a video manager (VMG) and a video title set (VTS). Each of the video manager (VMG) and the video title set (VTS) is composed of a plurality of files. The video manager (VMG) is information for controlling the video title set (VTS).

The video manager (VMG) includes a video manager information (VMGI) as control data for controlling a video title set and the like, and a video object set (VMGM) as data for menu display. VOBS). It also has a video manager information (VMGI) for backup.

The video title set (VTS) includes a video title set information (VTSI) as control data and a video object set (VMGM) 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 video display. VOBS). It also has a video title set information (VTSI) for backup.

Furthermore, it is a video object set for video display (VTSTT A VOBS is composed of a plurality of cells. A cell ID number is assigned to each cell.

  FIG. 8 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, video segmentation (scene change, angle change, story change, etc.) and special playback are performed in cell units or in video object unit (VOBU) units that are lower layers. It is to be handled.

A video object set (VOBS) starts with one or more video objects (VOB). IDN1 to VOB IDNii). In addition, one video object can contain one or more cells (C IDN1 to C IDNj). Furthermore, one cell (Cell) is composed of one or a plurality of video object units (VOBU). And one video object unit (VOBU) is one navigation pack (NV) PCK) one or more audio packs (A PCK) one or more video packs (V PCK), one or more sub-picture packs (SP PCK).

Navigation pack (NV PCK) is mainly used as control data for performing reproduction / display control of data in the video object unit to which it belongs and control data for performing data search of the video object unit.

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 for the main video. For example, movie subtitles, scenarios, etc., and run-length compression technology is used. Audio pack (A PCK) is audio information.

FIG. 9 shows video title set information (VTSI) in the video title set (VTS). Video title set information (VTS) in the video title set information (VTSI) PGCIT) is described. Therefore, when a video object set (VOBS) in one video title set (VTS) is played back, this video title set program chain information table (VTS) A program chain selected by the user from among a plurality of program chains presented in (PGCIT) is used.

  In the VTS program chain information table (VTS_PGCIT), information (VTS_PGCI) related to the VTS program chain (VTS_PGC) is described. Information (VTS_PGCITI) in the information table (VTS_PGCIT) related to the VTS program chain (VTS_PGC) and VTS program chain (VTS_PGC) ) VTS_PGCI search pointer (VTS_PGCI_SRP) for searching the VTS program chain (VTS_PGC) by the number (# 1 to #n), and each VTS program chain by the number (# 1 to #n) corresponding to the VTS program chain (VTS_PGC). Information (VTS_PGCI) related to (VTS_PGC) is described.

  The PGC information (VTS_PGCI) in the video title set includes program chain general information (PGC_GI), a program chain program map (PGC_PGMAP), a cell playback information table (C_PBIT), and a cell location information table (C_POSIT). It is described in the information (VTS_PGCI).

  The program chain general information (PGC_GI) describes the contents (PGC_CNT) of the program chain (PGC), the start address (C_PBIT_SA) of the cell playback information table (C_PBIT), and the start address (C_POSIT_SA) of the cell position information table (C_POSIT). Has been. Any start address (C_PBIT_SA and C_POSIT_SA) is described in the relative number of logical blocks from the first byte of the VTS_PGC information (VTS_PGCI).

  The cell playback information table (C_PBIT) defines the playback order of PGC cells. In this cell playback information table (C_PBIT), cell playback information (C_PBIT) is described continuously. Basically, the cells are reproduced in the order of the cell numbers. Cell category (C_CAT) is described in the cell playback information (C_PBIT).

  In this cell category (C_CAT), a cell block mode (Cell Block mode) indicating whether this cell is a cell in a cell block, or if it is a cell in a cell block, this cell Is a part of the block, or is a cell block type indicating whether it is an angle block (cell block type), whether this cell should be played back seamlessly after playback of the preceding cell or cells in the preceding block Seamless playback flag (Seamless playback flag) indicating the presence of this cell, an interleaved allocation flag (Interleaved allocation flag) indicating whether this cell exists in a continuous block or an interleaved block, this book STC discontinuity flag (STC discontinuity flag) that indicates whether or not a cell must be played after STC reset after playback of the preceding cell or cell in the preceding block, either non-seamless angle changing function or seamless angle changing function A seamless angle change flag (Seamless Angle Change flag) indicating that the cell is used, and a cell playback mode indicating whether the cell playback must be stopped or continuously played at the end PTM of each VOBU (Cell playback mode), an access restriction flag (Access Restriction flag) indicating the restriction on the playback method of this cell, and the application is “Karaoke”. Cell type used, the presence or absence of still after this cell playback and the cell still time indicating the still time (Cell Still time), the presence or absence of cell command executed after this cell playback and the cell command Then, a cell command number (Cell Command number) indicating the cell command number is described.

  As shown in FIG. 4, the cell playback information table (C_PBIT) includes a cell playback time (C_PBTM) describing the total playback time of the PGC. Further, in the cell playback information table (C_PBIT), the start of the first video object unit (VOBU) in the cell is indicated by the relative number of logical sectors from the first logical sector of the video object unit (VOBU) in which the cell is recorded. The address (C_FVOBU_SA) is described, the end address (C_FILVU_EA) of the first ILVU in the cell is described by the relative number of logical sectors from the first logical sector of the video object unit (VOBU) in which the cell is recorded, and The start address (C_LVOBU_SA) and end address (C_LV) of the last video object unit (VOBU) in the cell with the relative number of logical sectors from the first logical sector of the video object unit (VOBU) in which the cell is recorded BU_EA) is described.

  The cell location information table (C_POSI) specifies the identification number (VOB_ID) of the video object (VOB) of the cell used in the PGC and the identification number (C_ID) of the cell. In the cell location information table (C_POSI), cell location information (C_POSI) corresponding to the cell number described in the cell playback information table (C_PBIT) is described in the same order as the cell playback information table (C_PBIT). The cell location information (C_POSI) describes the identification number (C_VOB_IDN) and cell identification number (C_IDN) of the video object unit (VOBU) 85 of the cell.

  In FIG. 1, a recording medium 100 is placed on a turntable (not shown) and is rotationally driven by a spindle motor 101. If it is currently being reproduced, the information recorded on the recording medium 100 is picked up by the pickup unit 102. The pickup unit 102 is controlled to move in the radial direction of the disk, focus control, and tracking control by the servo unit 103. The servo unit 103 also sends a control signal to the motor drive unit 104 to perform rotation control of the spindle motor 101 (that is, rotation control of the recording medium 100).

  The output of the pickup unit 102 is input to the demodulation / error correction unit 105 and demodulated. Here, the demodulated demodulated data is input to the stream separation unit 107 via the track buffer 106. The demodulated data is input to the DSI decoder 109 via the DSI buffer 108. A DSI decoder buffer 110 is connected to the DSI decoder 109.

The decoded DSI (data search information) is sent to the system control unit 200. The demodulated data is sent to the system control unit 200 via the management information buffer 111. VMGI, VTSI, and the like are written in the management information buffer 111, and the system control unit 200 reads this information and performs reproduction control.
The stream separation unit 107 performs separation processing for each pack. The video pack (V_PCK) extracted from the stream separation unit 107 is input to the video decoder 123 via the video buffer 121 and decoded. A video decoder buffer 124 is connected to the video decoder 123. The video signal output from the video decoder 123 is input to the video mixing unit 125.

  Also, the sub picture pack (SP_PCK) extracted from the stream separation unit 107 is input to the sub picture decoder 127 via the sub picture buffer 126 and decoded. A sub picture decoder buffer 128 is connected to the sub picture decoder 127. The sub picture output from the sub picture decoder 127 is input to the video mixing unit 125.

  As a result, a signal obtained by superimposing the sub-picture on the main video signal is obtained from the video mixing unit 125 and supplied to the display. The audio pack (A_PCK) extracted from the stream separation unit 107 is input to the audio decoder 130 via the audio buffer 129 and decoded. An audio decoder buffer 131 is connected to the audio decoder 130. The output of the audio decoder 130 is D / A converted (not shown) and supplied to a speaker.

  The PCI pack extracted from the stream separation unit 107 is input to the PCI decoder 133 via the PCI buffer 132 and decoded. A PCI decoder buffer 134 is connected to the PCI decoder 133. The output of the PCI decoder 133 is input to a highlight information (HLI) processing unit 135. The stream separation unit 107 separates and derives main video information, sub-picture (caption and character) information, audio information, control information, and the like. That is, sub-picture (caption and character) information, audio information, management information, and control information are recorded on the recording medium 100 corresponding to the video information.

  In this case, various languages can be selected as sub-picture information, subtitle and character information, and audio information, which are selected according to control of the system control unit 200. An operation input by the user is given to the system control unit 200 through the operation unit 201.

  In the video decoder 123 that decodes the main video information, a decoding process corresponding to the method of the display device is performed. For example, the main video information is converted into NTSC, PAL, SECAM, wide screen, and the like. Also, audio information of a stream designated by the user is input to the audio decoder 130 and decoded. Also, the sub-picture data of the stream designated by the user is input to the sub-picture decoder 127 and decoded.

Next, a DVD video stream will be described.
FIG. 8 shows the DVD video stream structure, FIG. 10 shows the DVD video pack structure, and FIG. 11 shows the contents of the DVD video pack header, packet header, and packet payload.

  A DVD stream is constituted by a series of video object units (VOBU) which are the minimum access units. The VOBU conforms to the MPEG2 program stream, and always starts with a navigation pack (NV_PCK), and then a video pack (V_PCK), a sub-picture pack (SP_PCK), and an audio pack (A_PCK) are continuously formed.

  In the pack header, time information SCR (System Clock Reference) at which the pack arrives at the input buffer (in FIG. 1, the video buffer 121, the sub picture buffer 126, the audio buffer 129, and the PCI buffer 132 in FIG. 1) is described. Each pack can have one or more packets. The payload of the packet (excluding the packet header) can only have a single elementary data. For example, video data and audio data cannot be mixed as a payload of one packet.

  Stream_id is described in the packet header of each packet, and sub_stream_id is described in the first byte of the packet payload for a packet having stream_id of private_stream_1 (= BDh) and private_stream_2 (= BFh).

  In the packet header of the video packet, when the head of picture data is included in the packet, a time DTS (Decoding TimeStamp) for decoding the picture data or a time PTS (Presentation TimeStamp) for displaying the picture data for the first appearing picture is included. Can be described. When the picture is an I picture or a P picture, DTS and PTS can be described in the packet header, and when the picture is a B picture, only PTS can be described.

  In the packet header of the audio packet, when the head of the audio frame is included in the packet, a time PTS (Presentation TimeStamp) for decoding and displaying the audio data for the audio frame that appears first can be described. .

  When the head of a sub-picture unit (SPU) is included in the packet in the packet header of the sub-picture packet, the SP_DCSQ (Sub-pictureDisplayControlSequence: sub-picture at the head of this sub-picture unit with respect to the first sub-picture unit that appears. A time PTS (PresentationTimeStamp) for executing the (display control sequence) can be described.

  There is no field for writing time information in the packet header of the PCI packet.

DVD video management information will be described with reference to FIG.
The system control unit 200 reads management information called VMGI (Video Manager Information) and VTSI (Video Title Information) from the management information buffer 111, and performs playback control of the system according to this information. In particular, when a title is played back with a DVD video, playback is performed in units of Cell. The playback information of this cell is described in C_PBI (Cell Playback Information) included in VTS_PGCI (VTS ProgramChainInformation) in VTSI.

The operation of the stream separation unit 107 will be described.
When the cell is played back, the system control unit 200 superimposes the C_PBI data extracted from the management information in advance on the C_PBI pack of the present invention and inserts it at the top of the cell (see FIG. 2). 3 shows the structure of the C_PBI pack, FIG. 4 shows the pack header, packet header, and packet payload of the C_PBI pack, and FIG. 5 shows the contents of C_CAT (cell category) included in the data sent in the C_PBI pack.

  The stream separation unit 107 uses the Seamless_playback_flag included in the C_CAT to determine seamless / non-seamless connection when an STC discontinuity occurs, and uses the Cell_playback_mode to determine whether to execute the VOBU still.

  The contents stored in the internal register 107b of the stream separation unit 107 will be described with reference to FIG.

In FIG. 6, Seamless_playback_flag (R3) is inserted, that is, Flag Registors (R1 to R7), stream_id Registers (R8 to R16), STC per Vsync, PTM Registors (R18 to R22T, R22T to R22T, R22T to R22T) Consists of

  Flag Registers (R1 to R7) are configured by Stream_read_enable, First_process, Seamless_play_back_flag, Seamless_connect, Non_Seamless_connect, and Cell_playLack.

  stream_id REGISTORS (R8 from R16) is, Video_stream_id, Audio_stream_id, Audio_sub_stream_id, Sub_picture_stream_id, Sub_picture_sub_stream_id, PCI_data_stream_id, PCI_data_sub_stream_id, C_PBI_data_stream_id, is constituted by C_PBI_data_sub_stream_id.

  The PTM Registers (R18 to R22) are configured by old_VOBU_S_PTM, old_VOBU_E_PTM, cur_VOBU_S_PTM, cur_VOBU_E_PTM, and delta_PTM.

  The STILL_TIME FIFO (R23 to R [N + 25]) is composed of Ocupancy, w_ptr, r_ptr, STILL_TlME [0]... STILL_TIME [N-1].

  Accordingly, as shown in FIG. 7, a FIFO for holding the execution time of VOBU_STILL is configured.

  As shown in FIG. 12, the stream separation unit 107 performs Vsync processing by interruption of Vsync (video field synchronization signal), and returns to Pack processing when Vsync processing ends. 13 to 14 show the processing flow of the stream separation unit 107.

  The Vsync processing of the stream separation unit 107 will be described with reference to FIG.

  That is, the command register 107b is checked in ST0001, and command processing is executed in ST0002. After this execution, ST0003 when Seamless_connect = 1, ST0004 for executing seamless connection processing. After this execution, or when Seamess_connect is other than 1 in step 0003, ST0005 performs non-seamless connection processing when Non_Seamless_connect = 1. After this execution, or when Non_Seamless_connect is other than 1 in step 0005, ST0007 which executes VOBU still execution processing when Cell_playback_mode = 1.

  The pack processing of the stream separation unit 107 will be described with reference to FIG.

  That is, when Stream_read_enable = 1ST1001 and Non_Seamless_connect = 1, ST1002, end sector data is read from the track buffer 106, held in the internal temporary buffer, ST1004, and pack processing is executed ST1004.

Command processing in the stream separation unit 107 will be described with reference to the flowchart shown in FIG.
That is, it is checked whether a Stop command has been received from the system control unit 200, ST0101, and whether a Start command has been received from the system control unit 200, ST0102.
When this Start command is received, the Seamless_connect = 0 of the internal register 107b, Non_seamless_connect = 0, Cell_playback_mode = 0, On_VOBU_STILL = 0, Stream_read_enablc = 1, and ST0104 are performed.
When receiving the Stop command, ST0109 sets Stream_read_enable = 0 in the internal register 107b.
After STC initialization processing or when a Start command or Stop command is not received, On_VOBU_STILL of the internal register 107b is 1 and ST0105, and when a VOBU still release command is received from the system control unit 200, ST0106, VOBU still release processing ST0107 I do.

  Further, when other commands are received from the system control unit 200, ST010 performs processing for each command.

The STC initialization process will be described with reference to the flowchart of FIG.
When STC initialization has not been completed, ST0201, ST0202 that performs STC initialization for the video decoder 123, the audio decoder 130, and the sub-picture decoder 127.

The VOBU still release process will be described with reference to the flowchart of FIG.
When the reception of the VOBU still release command from the system control unit 200 is determined, ST0301, the video decoder 123, the audio decoder 130, and the sub-picture decoder 127 start counting up STCs, and ST0302 and the internal register On_VOBU_STILL = 0.

The seamless connection process will be described with reference to the flowchart of FIG.
ST0401 to read STC. When STC becomes the same as old_VOBU_E_PTM, ST0403 transmits STC offset deita_PTM to ST0402, the video decoder 123, the audio decoder 130, and the sub-picture decoder 127. Furthermore, ST0404 in which the internal register Seamless_connect = 0 is set.

Non-seamless connection processing will be described with reference to the flowchart of FIG.
Read STC ST0501. When STC becomes larger than old_VOBU_E_PTM, ST0502 checks the data amount of the video buffer 121, audio buffer 129, and sub-picture buffer 126 ST0503. When the playback of the last VOBU of the preceding CELL is completed, ST0504 performs STC resetting on the stream separation unit 107, the video decoder 123, the audio decoder 130, and the sub-picture decoder 127 ST0505. Furthermore, ST0506 in which Non_seamless_connect = 0 of the internal register is set.

The VOBU still execution process will be described with reference to the flowchart of FIG.
ST0601 reads ST0602 when STILL_TIME FIFO Ocupancy ≠ 0 and ST0602 reads STC. When STC = STILL_TIME [r_ptr], ST0603, ST0604 which stops the STC count-up of the stream separation unit 107, the video decoder 123, the audio decoder 130, and the sub-picture decoder 127. Further, On_VOBU_STILL of the internal register is set to 1, ST0605, w_ptr = (w_ptr + 1)% N (where “%” is a modulo calculation) ST0606, Ocapancy = Ocupancy-1 ST0607.
The Pack process will be described with reference to the flowchart shown in FIG.
First, when a navigation pack is detected, ST1101, VOBU_S_PTM and VOBU_E_PTM are read from PCIPcket, ST1102, VOBU_S_PTM and VOBU_E_PTM are held, and ST1103 is set as follows.

old_VOBU_S_PTM = VOBU_S_PTM
old_VOBU_E_PTM = VOBU_E_PTM
old_VOBU_S_PTM = VOBU_S_PTM
old_VOBU_E, PTM = VOBU_E_PTM
Next, ST1104 performs element addition processing to STILL_TIME_FiFO when Cell_playback_mode = 1.

  After this, when First_process = 0, STll06, and ST107 which performs the following calculation.

delta_PTM = old_VOBU_E_PTM-cur_VOBU_S_PTM
After this, when delta_PTM is not 0, ST1108 and STC discontinuity flag are set and ST1109 and PCI packet are transmitted to the PCI buffer 132 (ST1110).

  In the above step 1106, when First_process = 0 is not satisfied, First_Process = 0 of the internal register is set, and the process proceeds to ST1111 and step 1110.

  In addition, when Video Pack is detected, ST1112 performs Video Packct processing ST1113.

  Also, ST1114 when Audio Pack is detected, ST1115 for performing Audio Packct processing.

  In addition, ST1116 when Sub-picture Pack is detected, ST1117 which performs Sub-picture Packet processing.

  Further, when C_PBI Pack is detected, ST1118, the following flag of C_PBI data area is held in the internal register 107b ST1119.

・ Seamless_pIaybackflag
・ Cell_playback_mode
When no packet is detected, this sector data is discarded ST1120.

The element addition processing to STILL_TIME_FIFO will be described with reference to the flowchart of FIG.
When the Ocupancy of STILL_TIME_FIFO is smaller than N, ST1201, STILL_TIME [w_ptr] = VOBU_E_PTM is set to ST1202, w_ptr = (w_ptr + 1)% N (where “%” is modulo calculation) ST1203, Ocupicc = 204.
The STC discontinuity flag setting will be described with reference to the flowchart of FIG.
ST1301 when Seamless_playback_flag is 0, and ST1302 which sets Non_seamless_connect of the internal register to 1. Also, ST1301 when Seamless_playback_flag is 1, and ST1303 which sets Seamess_connect of the internal register to 1.

The Video Packet process will be described with reference to the flowchart in FIG.
When PTS & DTSoPTS exists, ST1401, PTS & DTSoPTS is transmitted to the video decoder 123 and ST1402, and elementary data is transmitted to the video buffer 121 ST1403.

The Audio Packet process will be described with reference to the flowchart in FIG.
When PTS exists, ST1501, PTS is transmitted to the audio decoder 130 and ST1502, and elementary data is transmitted to the audio buffer 129 ST1503.

The Sub-picture Packet process will be described with reference to the flowchart of FIG.
When PTS exists, ST1601, PTS is transmitted to the sub-picture decoder 127, ST1602, and elementary data is transmitted to the sub-picture buffer 126, ST1503.

  As described above, in DVD playback, seamless playback processing with VOBU still or STC discontinuity is essential. When these processes are performed, it is necessary to obtain reproduction information for each cell (DVD stream reproduction unit). This cell playback information is included in the management information (VTSI), acquired by the navigation manager NM (VMGI, VTSI, navigation pack management part, host), and presents information (Cell_playback_flag, Seamsess_playback_flag, etc.) necessary for playback control. It is necessary to set the engine PE (part for decoding the DVD stream). However, since the cell and the cell reproduction information are separately described on the disc, the PE needs a means for recognizing the combination of the cell and the corresponding cell control information.

  Therefore, the present invention adds the identification number to the cell playback information (C_PBI), packs it, and embeds it in the stream, so that the stream separator in the PE does not perform FIFO management, and the cell control information corresponding to the cell. Can be easily recognized.

  That is, CELL reproduction information can be acquired in synchronization with the stream by embedding and embedding C_PBI at the head of the CELL of the DVD stream.

1 is a block diagram of a system of the present invention. It is a figure which shows insertion of a C_PBI pack. It is a figure which shows the structure of a C_PBI pack. It is a figure which shows the content of the pack header of a C_PBI pack, a packet header, and a packet payload. It is a figure which shows the content of C_CAT (cell category). It is a figure which shows the internal register of a stream separation part. It is a figure which shows FIFO for hold | maintaining VOBU still execution time. It is a figure which shows the stream structure of DVD-Video. It is a figure which shows the position of C_PBI (cell reproduction information). It is a figure which shows the pack structure of DVD-Video. It shows the contents of a pack header and a packet header of DVD-Video. It is a figure which shows the interruption process of a stream separation part. It is a flowchart of the Vsync process and Pack process in a stream separation part. It is a flowchart of the command processing in a stream separation part. It is a flowchart of the STC initialization process in a stream separation part. It is a flowchart of the VOBU still cancellation | release process in a stream separation part. It is a flowchart of the seamless connection process in a stream separation part. It is a flowchart of the non-seamless connection process in a stream separation part. It is a flowchart of the VOBU still execution process in a stream separation part. It is a flowchart of the pack separation processing in the stream separation unit. It is a flowchart of the element addition process to STILL_TIME_FIFO in the stream separation unit. It is a flowchart of the STC discontinuity flag setting process in a stream separation unit. It is a flowchart of the Video packet process in a stream separation part. It is a flowchart of the Audio packet process in a stream separation part. It is a flowchart of Sub-picture packet processing in a stream separation unit.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... DVD disk 101 ... Spindle motor 102 ... Pickup part 103 ... Servo part 104 ... Motor drive part 105 ... Demodulation / error correction part 106 ... Track buffer 107a ... Sector data buffer 107b ... Register 107 ... Stream separation part 108 ... DSI buffer 109 ... DSI decoder 110 ... DSI decoder buffer 111 ... management information buffer 121 ... video buffer 123 ... video decoder 124 ... video decoder buffer 125 ... video mixing unit 126 ... sub-picture buffer 127 ... sub-picture decoder 128 ... sub-picture decoder buffer 129 ... audio Buffer 130 ... Audio decoder 131 ... Audio decoder buffer 132 ... PCI decoder buffer 1 3 ... PCI decoder 134 ... PCI decoder buffer 135 ... HLI processor 200 ... system control unit 201 ... operation unit

Claims (6)

A data area and a management area in which management data for managing data in the data area is recorded;
In the data area, data is divided and recorded in a plurality of program chains, each program chain is composed of a plurality of object data, one object data is composed of a plurality of cells, and one cell is composed of a plurality of packs. In a reproducing apparatus for reproducing data from a recording medium recorded in a hierarchical structure,
First reading means for reading cell reproduction information (C_PBI) of one object data unit from the management area of the recording medium;
Packing means for packing the cell reproduction information read by the first reading means with an identification number;
A second reading means for reading one object data unit cell from the data area of the recording medium;
An adding unit for adding the cell reproduction information pack packed by the packing unit to the head of each cell of the object data read by the second reading unit;
Reproducing means for reproducing the information of each cell of the object data following the pack using the cell reproduction information in the cell reproduction information pack;
A playback apparatus comprising: A data area and a management area in which management data for managing data in the data area is recorded;
In the data area, data is divided and recorded in a plurality of program chains, each program chain is composed of a plurality of object data, one object data is composed of a plurality of cells, and one cell is composed of a plurality of packs. In reproducing data from a recording medium recorded in a hierarchical structure,
Read cell reproduction information (C_PBI) of one object data unit from the management area of the recording medium,
The read cell playback information is packed with an identification number,
Read one object data unit cell from the data area of the recording medium,
A packed cell reproduction information pack is attached to the top of each cell of the read object data,
Using the cell reproduction information in this cell reproduction information pack, the information of each cell of the object data following this pack is reproduced.
A reproduction method characterized by the above. In a reproducing apparatus for reproducing a recording medium on which a DVD stream to be reproduced in a cell unit composed of a plurality of packs in which data is recorded and management information including cell reproduction information is recorded.
Means for reading management information and cells of the DVD stream from the recording medium;
Means for obtaining cell reproduction information from the read management information;
Means for packing the acquired cell playback information with an identification number;
Means for adding the packed cell reproduction information to the head of the cell of the DVD stream read by the reading means and writing it to the track buffer;
Stream separating means for reading the DVD stream from the track buffer and separating the read data from the pack containing cell reproduction information and other data packs according to the identification number;
A playback apparatus comprising:   The stream separating means, when detecting that the pack read from the track buffer is a cell playback information pack, holds this information and controls STC discontinuity processing or VOBU still processing. The playback apparatus according to claim 3. Management information including cell playback information is recorded, and playback of a recording medium on which a DVD stream to be played back in units of cells including a plurality of packs in which data is recorded is played back.
Read management information and DVD stream cells from the recording medium,
Cell reproduction information is obtained from the read management information,
The obtained cell playback information is packed with an identification number,
This packed cell reproduction information is added to the head of the cell of the read DVD stream and written to the track buffer,
The DVD stream is read from the track buffer, and the read data is separated from the pack including the cell reproduction information according to the identification number and the other data pack.
A reproduction method characterized by the above.   The stream separating means, when detecting that the pack read from the track buffer is a cell playback information pack, holds this information and controls STC discontinuity processing or VOBU still processing. The reproduction method according to claim 5.

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