JP3931102B2 - Playback apparatus and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a playback apparatus and a playback method for playing back an optical disc on which data can be additionally written.
[0002]
[Prior art]
Conventionally, in order to effectively use a recording area in an optical disc such as a CD-R (Compact Disc-Recordable) or a CD-RW (Compact Disc-ReWritable), Such a reproducing apparatus has been devised.
[0003]
With reference to FIG. 5, the data structure of an optical disc employing the above-described multi-session method will be described.
[0004]
FIG. 5 is a diagram showing a storage position of data recorded on the optical disc. An optical disc is physically configured to record information in a spiral from the inside to the outside. More specifically, as shown in FIG. 5, the optical disc is divided into a power calibration area (PCA), a program memory area (PMA), a first session, and a second session from the inside of the optical disc. Each session includes a program area, and a lead-in area and a lead-out area are arranged before and after the program area.
[0005]
The PCA is an area for adjusting the laser power (recording output value) when recording data on the optical disc to an optimum value. The PMA is an area for recording information (track information; track number, track start position, end position, etc.) related to the program recorded in the program area before finalization processing.
[0006]
The lead-in area is an area that indicates the start of the session. The track information recorded in the PMA, the total length of the program area, and the like are recorded as TOC (Table Of Contents) information, and the program area of the next session is started. Record the address etc.
[0007]
The program area is an area for recording a path table, a directory, a track (for example, a song, a file), etc. included in the session or the previous session, and includes a PVD (Primary Volume Descriptor) or SVD (SVD) included therein. Supplementary Volume Descriptor) manages the location where the session or the path table, directory (including root directory), track, etc. included in the previous session are recorded.
[0008]
Here, the path table is a search table that indicates all directories on the optical disk, and specifically records the physical storage position of each directory.
[0009]
The lead-out area is an area indicating the end of the session.
[0010]
Next, with reference to FIG. 6, a description will be given of a DISC reproduction process in the case where the above-described optical disk or the like is reproduced by a conventional reproducing apparatus. FIG. 6 is a flowchart showing the flow of the DISC reproduction process. Note that a conventional reproducing apparatus includes a control unit such as a CPU (Central Processing Unit) and a ROM, a reproduction driving unit (for example, an optical pickup) and the like. Then, the CPU controls various operations such as disk reproduction by the reproduction driving unit in accordance with various application programs stored in the ROM.
[0011]
In FIG. 6, first, the CPU of the playback device loads a loaded disc and determines whether the disc is a CDDA or a CD-ROM based on the format of the disc (step D1). If the CPU determines that the disc is CDDA (step D1; CDDA), the CPU reproduces the disc based on the TOC information included in the lead-in area (step D2).
[0012]
When the CPU determines that the disk is a CD-ROM (step D1; CD-ROM), the CPU further determines whether the CD-ROM is a multi-session system. Specifically, whether or not the start address of the program area of the next session (that is, the second session) is recorded in the lead-in area of the first session of the CD-ROM, or the multi-session pointer included in the lead-in area To determine whether there is a next session (step D3).
[0013]
Here, if the start address of the program area of the next session (that is, the second session) is not recorded in the lead-in area of the first session of the CD-ROM or there is no multi-session pointer (step D3; NO) The CPU determines that this CD-ROM is not a multi-session method (that is, a single-session method). Then, the CPU acquires the position of the path table and directory managed by the PVD in the program area of the first session (step D4), and reads the path table and directory at the acquired position (steps D5 and D6). Next, the CPU acquires link information of tracks (here, files) included in the directory (step D7), and each track (based on the acquired link information of the track and the directory structure described in the session). Here, the file is reproduced (step D8).
[0014]
In step D3, the start address of the program area of the next session (that is, the second session) is recorded in the lead-in area of the first session of the CD-ROM, or the multi-session method is used by the multi-session pointer. (Step D3; Yes), the CPU determines that this CD-ROM is a multi-session method. Then, the CPU obtains the start address of the program area of the next session from the lead-in area (step D9), moves the optical pickup to the lead-in area of the next session (step D10), and moves the next session to the moved lead-in area. It is determined whether or not the start address of the program area is recorded (step D11).
[0015]
If the start address of the program area of the next session is recorded in the moved lead-in area (step D11; Yes), the process returns to step D9 to continue the process. Further, when the start address of the program area of the next session is not recorded in the moved lead-in area, or when the multi-session pointer included in the lead-in area of the session indicates the last session (that is, “FF” .FF.FF "or B0 is omitted) (step D11; NO), the CPU regards the current session as the last session and the path table and directory managed by the PVD in the program area of the last session. The position is acquired (step D12), and the path table and directory at the acquired position are read (steps D13 and D14). Next, the CPU obtains link information of tracks (files here) included in the directory (step D15), and proceeds to step D8.
[0016]
[Problems to be solved by the invention]
As described above, when playing back each file recorded on the CD-ROM in the conventional playback device, the last session (first session in the case of a single session) is searched and recorded in the last session. I had to read out the directory and files. For this reason, there is a problem that it takes time to play back when the number of sessions included in the disc is large.
[0017]
Conventionally, it is determined in advance whether the optical disk is a CDDA or a CD-ROM, and based on the determination result, a reproduction process corresponding to the CDDA or a reproduction process corresponding to the CD-ROM is performed on the entire optical disk. As a result, the CDDA format and the CD-ROM format cannot be handled together on a single optical disc.
[0018]
An object of the present invention is to reduce the time required to reproduce a multi-session type optical disc and to cope with the case where a CDDA format and a CD-ROM format are mixed on the optical disc. It is.
[0019]
[Means for Solving the Problems]
The present invention
In a playback device capable of playing a multi-session optical disc,
Reading means for reading each session recorded on the optical disc;
Extraction means for extracting a difference between information indicating a directory and a file included in each session read by the reading means and information indicating a directory and a file up to the previous session of each session;
Based on the difference extracted by the extracting means, reproducing means for reproducing the optical disc;
It is characterized by having.
[0020]
The present invention
The system further comprises management means for managing the difference extracted by the extraction means in association with each session.
[0021]
In the present invention,
The management means manages data recorded on the optical disc by format.
[0022]
In the present invention,
The reproduction means reproduces the optical disc for each session based on a difference corresponding to each session managed by the management means.
[0023]
The present invention also provides:
It is further characterized by further comprising changing means for changing hardware or software settings for each session.
[0024]
The present invention also provides:
It further comprises storage means for storing the start address and end address of the lead-in area, the end address of the lead-out area, or the start address of the program area included in each session.
[0025]
The present invention also provides:
It is further characterized by further comprising a display control means for displaying on the display means the session number indicating the session and the number of sessions that have been read during reading of each session by the reading means.
[0026]
In the present invention,
The display control means causes the display means to display the number of directories and files included in the session and the number of directories and files that have been read, during reading of each session by the reading means. Yes.
[0027]
The present invention also provides:
When the optical disc is reproduced, further comprising designation means for designating any one of reproduction of all sessions and reproduction of a session instructed by the user,
The reproducing means reproduces the optical disk based on the reproduction mode designated by the designation means.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a disk reproducing apparatus to which the present invention is applied will be described below in detail with reference to the drawings.
[0029]
First, the configuration will be described. FIG. 1 is a block diagram showing the internal configuration of the disc playback apparatus 1. As shown in FIG. 1, the disc playback apparatus 1 includes a system control unit 11, a display unit 12, an operation unit 13, a playback operation drive unit 14, a signal processing circuit 15, a D / A converter 16, an amplification circuit 17, and an audio. An output terminal 18 is used.
[0030]
The system control unit 11 outputs control signals to the respective constituent elements of the disc playback apparatus 1 to control them uniformly, and includes a CPU 11a, a ROM 11b, and a RAM (Random Access Memory) 11c.
[0031]
The CPU 11a reads out a control program stored in the ROM 11b in accordance with a press signal input from the operation unit 13, develops it in the work memory of the RAM 11c, and executes and controls operations according to the control program. Note that data exchange between the CPU 11a and the outside is performed via an input port and an output port (not shown).
[0032]
Further, the CPU 11a executes a DISC playback process (see FIG. 2) described later, and if the disk 101 is a multi-session system, it determines whether the track format is CDDA or CD-ROM for each session.
When the track format in the session is CDDA, the disc 101 is reproduced based on the TOC information included in the lead-in area.
When the track format in the session is CD-ROM, the path table and directory in the program area are read, link information is obtained from the files included in the directory, and the link information and the session information are described. The disc 101 is reproduced on the basis of the directory structure.
That is, the CPU 11a has a function as a determination unit.
[0033]
When the disk 101 is a multi-session method and the track format in the session is CD-ROM, the directory structure described in the session is the directory structure of the current session and the directory structure up to the previous session. , Including. That is, the directory structure of “first session” + “second session” is described in the second session. For this reason, the CPU 11a acquires the directory structure of the session to be read by extracting the difference between the directory structure of the session to be read (for example, the second session) and the previous session (in this case, the first session). The disc 101 is reproduced based on the directory structure of the session.
That is, the CPU 11a has a function as extraction means.
[0034]
The ROM 11b is composed of a magnetic or optical recording medium or a nonvolatile memory such as a semiconductor. The ROM 11b stores a control program or the like corresponding to the disk playback device 1.
[0035]
The RAM 11c has a work area for temporarily storing a program read from the ROM 11b, a program read from the ROM 11b, data read from the disk 101, and input or output data in various processes executed by the CPU 11a. Form.
[0036]
Further, the RAM 11c stores the link information of the tracks included in each session and the directory structure described in the current session in association with the session number. The RAM 11c stores and manages the directory structure of each session extracted by the CPU 11a in association with the session number.
That is, the RAM 11c has a function as management means.
[0037]
The display unit 12 is configured by an LCD (Liquid Crystal Display) or the like, and a session number (for example, a first number) being read from the disk 101 is displayed on the display screen according to an instruction of a display signal input from the CPU 11a of the system control unit 11. In the case of session: “S1”, in the case of second session: “S2”), and the number of sessions that have been read are displayed. In addition, during reading of each session, the display unit 12 displays the number of directories and files included in the session being read and the number of directories and files that have been read.
That is, the CPU 11a has a function as a display control unit, and the display unit 12 has a function as a display unit.
[0038]
The operation unit 13 includes various function keys such as a reproduction key, a numeric keypad, a SKIP UP / DOWN key, a stop key, and an EJECT key, and outputs an operation signal generated by the key operation to the system control unit 11. The operation unit 13 may output an operation signal by remote control to the system control unit 11.
Further, the operation unit 13 outputs an operation signal instructing an instruction such as “setting of reproduction format” and “setting of reproduction mode” to the system control unit 11 as necessary.
That is, the operation unit 13 has a function as a designation unit.
[0039]
The reproduction operation drive unit 14 includes an optical pickup (not shown), a tracking thread servo circuit, a spindle servo circuit, and the like. Based on the control signal input from the reproduction operation drive unit 14 and the system control unit 11, the target address on the loaded disk 101 is searched and the data corresponding to the address is reproduced.
That is, the reproduction operation drive unit 14 has a function as reproduction means.
[0040]
The optical pickup moves in the radial direction of the disk 101 by a thread controlled by a tracking thread servo circuit, which will be described later, when the disk 101 is reproduced, irradiates the disk 101 with laser light, and converts the reflected light into an electrical signal. Data recorded on the disk 101 is read by conversion.
That is, the optical pickup has a function as reading means.
[0041]
The tracking sled servo circuit moves the optical pickup in the radial direction of the disc 101 by applying a sled drive signal to the sled motor during reproduction of the disc 101.
[0042]
The spindle servo circuit controls the spindle motor to a constant linear velocity by rotating the disk 101 by applying a spindle drive signal to the spindle motor that supports the disk 101 from below when the disk 101 is reproduced.
[0043]
The signal processing circuit 15 is configured by a DSP (Digital Signal Processor) or the like, and performs a decoding process corresponding to data (digital signal) read by the optical pickup. Specifically, the CPU 11a sets a decoding method (such as EFM decoding / AAC decoding / MP3 decoding) according to the track (file) for each session, and performs decoding processing of the decoding method on the track.
That is, the CPU 11a has a function as changing means.
[0044]
The D / A converter 16 converts the digital signal processed by the signal processing circuit 15 into an analog signal when the disc 101 is reproduced.
[0045]
The amplifier circuit 17 amplifies the analog signal input from the D / A converter and outputs the amplified analog signal to the audio output terminal 18.
The audio output terminal 18 includes an earphone or a headphone connected via a connector unit (not shown), a speaker built in the main body, and the like, and reproduces and outputs the audio amplified by the amplifier circuit 17 to the outside.
[0046]
Next, the operation will be described.
FIG. 2 is a flowchart showing the flow of the DISC reproduction process executed by the CPU 11a of the disk reproduction apparatus 1.
[0047]
In FIG. 2, first, the CPU 11a of the disc playback apparatus 1 loads the disc 101 loaded in the playback operation drive unit 14, and determines whether or not the disc 101 is of a multi-session system. Specifically, whether or not the start address of the program area of the next session (that is, the second session) is recorded in the lead-in area of the first session of the disc 101, or the multi-session pointer included in the lead-in area To determine whether there is a next session (step A1).
[0048]
In step A1, if the start address of the program area of the next session is not recorded in the lead-in area of the first session or if there is no multi-session pointer (step A1; NO), the CPU 11a determines that this disk 101 is a single session. Judged to be a method. Then, the CPU 11a determines whether the disk 101 is a CDDA or a CD-ROM based on the format of the disk 101 (step A2).
[0049]
In step A2, if the CPU 11a determines that the disc 101 is CDDA (step A2; CDDA), the CPU 11a plays the disc based on the TOC information included in the lead-in area (step A3).
[0050]
In step A2, if the CPU 11a determines that the disk is a CD-ROM (step A2; CD-ROM), the CPU 11a determines the location of the path table and directory managed by the PVD in the program area of the first session. Obtain (step A4) and read out the path table and directory of the obtained position (steps A5 and A6). Next, the CPU acquires link information of tracks (here, files) included in the directory (step A7), and tracks each track based on the acquired link information of the tracks and the directory structure described in the first session. (File here) is reproduced (step A8).
[0051]
In step A1, if the start address of the program area of the next session is recorded in the lead-in area of the first session or the multi-session pointer indicates that the multi-session method is used (step A1; Yes) The CPU 11a determines that the disk 101 is a multi-session method. Next, the CPU 11a determines whether the track format of the current session corresponds to CDDA or CD-ROM (step A9).
[0052]
In step A9, when the track format of the current session corresponds to CDDA (step A9; CDDA), the CPU 11a plays the disc based on the TOC information included in the lead-in area (step A10), and step A19. Migrate to
[0053]
In step A9, when the track format of the current session corresponds to CD-ROM (step A9; CD-ROM), the CPU 11a manages the path table and directory managed by the PVD in the program area of the current session. Is acquired (step A11), and the path table and directory at the acquired position are read (steps A12 and A13). Next, the CPU acquires link information of tracks (here, files) included in the directory (step A14).
[0054]
Subsequently, the CPU 11a corresponds the acquired link information and the directory structure described in the current session with the session number (for example, “S1” for the first session, “S2” for the second session). Then, it is stored in the RAM 11c (step A15). Then, the CPU 11a determines the difference between the directory structure of the session immediately before the current session stored in the RAM 11c and the directory structure described in the current session (that is, the directory structure of the current session. If it is a session, the directory structure described in the current session is extracted from the first session, and the session number (eg, “S1” for the first session: “S1”, for the second session: “S2”) and stored in the RAM 11c (step A16).
[0055]
Further, the CPU 11a selects a decoding method corresponding to a track (here, a file) included in the current session, sets the decoding method in the signal processing circuit 15 (step A17), and stores the track (here, the RAM 11c). , File) link information and the directory structure of the difference (that is, the directory structure of the current session), each track of the current session is reproduced (step A18). The CPU 11a determines whether the start address of the program area of the next session is recorded in the lead-in area of the current session before, during, or after the reproduction of each track, or the It is determined whether the session pointer indicates the last session (“FF.FF.FF” or B0 is omitted), that is, whether there is a next session, and the determination result is stored in the RAM 11c. deep. Then, after the reproduction of each track, the CPU 11a reads the determination result stored in the RAM 11c, and when there is a next session (step A19; Yes), moves the optical pickup to the program area of the next session (step A20). ), And returns to Step A9. If there is no next session (step A19; No), the DISC reproduction process is terminated.
[0056]
As described above, when the disc 101 is a multi-session system, the CPU 11a of the disc playback apparatus 1 determines whether the track format is CDDA or CD-ROM for each session, and for each session based on the determination result. Thus, playback corresponding to CDDA (that is, playback of the disc 101 based on the TOC information included in the lead-in area) or playback corresponding to CD-ROM (that is, from the file included in the directory in the program area) The reproduction of the disc 101 based on the acquired link information and the directory structure of the current session is executed.
[0057]
Accordingly, when playing back the multi-session disc 101, for example, “read first session” → “play back first session” → “read second session” → “play back second session”. Since it can be played back for each session, the reading time until the start of playback can be shortened.
At this time, the directory structure of the current session can be acquired by taking the difference between the directory structure of the previous session and the directory structure of the current session. By repeating this process, the directory structure of each session (that is, directories and files included in each session) can be acquired and managed.
[0058]
In addition, the track format can be determined for each session, and playback corresponding to CDDA or playback corresponding to CD-ROM can be executed based on the determination result. It can also be used when formats are mixed.
[0059]
Conventionally, in order to shorten the reading time, a method of increasing the rotation speed of the disk 101 has been taken, but it is not necessary to increase the rotation speed unnecessarily.
[0060]
Conventionally, if there was a session that could not be read in the middle, there was a problem that all sessions could not be played back.However, if playback was possible for each session as in this embodiment, sessions that could not be read would be The removed session can be played.
[0061]
In addition, since track management is performed for each session, by leaving all session information in the RAM 11c, special playback for each session (random playback / program playback within a session, random playback / program playback for each session, ALL) CDDA playback, ALL compressed audio playback, etc.) are possible, and convenience is improved.
[0062]
Playback is possible even when there is no correlation between sessions (the directory structure up to the previous session is not included in the directory information of the current session), so convenience is improved.
[0063]
Further, in association with the above-described DISC reproduction process (see FIG. 2), the following reproduction setting process and reading display process may be further executed.
[0064]
FIG. 3 is a flowchart showing the flow of the playback setting process. In this reproduction setting process, “reproduction format” or “reproduction mode” to be further considered in the above-described DISC reproduction process (see FIG. 2) is set. Therefore, this playback setting process is a process that should be executed before the DISC playback process.
[0065]
In FIG. 3, the CPU 11a of the disc playback apparatus 1 causes the operation unit 13 to select “set playback format” or “set playback mode” (step B1).
[0066]
Here, when “set playback mode” is selected (step B2; playback mode), the CPU 11a causes the operation unit 13 to perform “1 session playback”, “all session playback”, and “every session playback end”. Then, one of the playback modes of “playback while asking whether to read the next session” is selected, and the selected playback mode is stored in the RAM 11c (step B3).
[0067]
Further, when “reproduction format setting” is selected in step B1 (step B2; reproduction format), the CPU 11a causes the operation unit 13 to perform “CDDA”, “CD-ROM”, and “CDDA and CD-ROM”. Is selected, and the selected playback format is stored in the RAM 11c (step B4).
[0068]
Here, when “CD-ROM” or “CDDA and CD-ROM” is selected as the playback format (step B5; Yes), the CPU 11a further determines that the priority format is “CDDA” by the operation unit 13, or “CD-ROM” is selected and stored in the RAM 11c (step B6).
[0069]
If “CD-ROM” is selected as the priority format (step B7; CD-ROM), the CPU 11a further selects whether or not there is a compression method to be prioritized by the operation unit 13, and gives priority to the compression method. If there is (step B8; Yes), the operation unit 13 selects the compression method from “MP3”, “AAC”, “others”, etc., and stores it in the RAM 11c (step B9). Exit.
[0070]
Then, the CPU 11a may execute the DISC playback process (see FIG. 2) according to the “playback format” or “playback mode” set in the above-described playback setting process. Also, in this playback setting process, by setting the “playback format”, it is possible to set and manage the priority for each format of the disk 101, so that playback is performed in accordance with the sound quality and music listening environment. It becomes possible to do. Also, by setting the “playback mode” in this playback setting process, it is possible to set according to the user's usage environment, and convenience is improved.
[0071]
FIG. 4 is a flowchart showing the flow of the reading display process. This reading and displaying process is a process to be incorporated in the above-described DISC reproduction process (see FIG. 2) or executed by an interrupt when the DISC reproduction process is executed.
[0072]
In FIG. 4, the CPU 11a of the disc playback apparatus 1 determines whether or not the disc 101 is a multi-session method (step C1). Here, if the disk 101 is not the multi-session system (step C1; No), the process proceeds to step C4. If the disk 101 is a multi-session method (step C1; Yes), the CPU 11a displays “MULTI SESSION” on the display unit 12 (step C2). Further, the CPU 11a displays the session number being read (for example, “S1” for the first session, “S2” for the second session) and the number of sessions that have been read on the display unit 12 ( Step C3).
[0073]
Next, the CPU 11a displays the number of files included in the session that is currently being read and the number of files that have been read on the display unit 12 (step C4), and ends the reading and displaying process.
[0074]
As described above, since the reading status of the disc 101 in the disc reproducing apparatus 1 can be displayed on the display unit 12 and notified to the user, even when the number of tracks included in the disc 101 is large and reading takes time, the user can be notified. The situation can be grasped. In addition, since the number of already read sessions is displayed on the display unit 12, it is possible to quickly cope with the case where the operation unit 13 instructs to reproduce the already read session.
[0075]
In the present embodiment, in the DISC playback process (see FIG. 2), the data of the previous session is set as Null data at the stage where reading of a new disc is started when the session is not multi-session or when reading the first session. It can also be realized by taking the difference from the session. By doing so, the flow of the multi-session and the single session becomes the same, so that software development can be simplified.
[0076]
In the present embodiment, the differences for all sessions are stored. However, the present invention is not limited to this, and the entire disk may be reproduced by storing the directory structure of the previous session. Further, the start address or end address of the lead-in area, the end address of the lead-out area, and the start address of the program area of each session that has been read may be stored in the RAM 11c. By doing so, the reading time can be improved. At this time, the RAM 11c has a function as a storage unit.
[0077]
In the present embodiment, the signal processing circuit 15 is set for each session. However, the present invention is not limited to this, and in the case of reproducing only a specific format, the signal processing circuit 15 is set for each session. It is not necessary to set.
[0078]
In this embodiment, the case where the disc 101 is a CDDA has been described. However, the present invention is not limited to this, and the disc 101 does not support CDDA multi-session or CDDA normal playback (for example, It is also possible to cope with a compressed audio reproducing apparatus using a CD-ROM.
[0079]
Also, in this embodiment, the data management method for each session is managed by information such as directories and files included in each session (difference of information such as directories and files included in each session is managed). However, the present invention is not limited to this, and information such as directories and files included in each session (that is, information such as directories and files included in each session is managed as it is) and the difference is used during playback. May be.
[0080]
In the present embodiment, the disk 101 played back by the disk playback apparatus 1 is not described in detail, but a disk having an ISO9660 file system or a file system conforming or similar to the disk system (for example, Joliet, Romeo etc.). Also, other file systems can be supported if the disk configuration is divided into several sessions and each session has a table for managing file information such as addresses and names. It is.
[0081]
In the present embodiment, the playback setting process (see FIG. 3) and the reading display process (see FIG. 4) are given as the processes accompanying the DISC playback process (see FIG. 2). The CPU 11a may execute it in response to the request.
[0082]
Further, in the reading and displaying process (see FIG. 4), when the disk 101 is a multi-session system, “MULTI SESSION” is displayed on the display unit 12. However, the present invention is not limited to this, and katakana and marks are displayed. It may be used to indicate the multi-session method. Further, when the disk 101 is not in a multi-session system, a display indicating that it is a single session may be performed.
[0083]
Further, the present invention is not limited to the contents of the above embodiment, and can be appropriately changed without departing from the gist of the present invention.
[0084]
【The invention's effect】
According to the present invention, playback is performed based on the difference between information on directories and files included in each session and information on directories and files included in the previous session. The reading time until the start of playback can be shortened.
Further, since playback can be executed based on the format of each session, it is possible to cope with a case where a plurality of formats are mixed on the disc.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an internal configuration of a disc playback apparatus 1;
FIG. 2 is a flowchart showing a flow of a DISC reproduction process in the present embodiment.
FIG. 3 is a flowchart showing a flow of a reproduction setting process.
FIG. 4 is a flowchart showing a flow of reading display processing.
FIG. 5 is a diagram showing a storage position of data stored on an optical disc.
FIG. 6 is a flowchart showing a flow of conventional DISC reproduction processing.
[Explanation of symbols]
1 Disc player
11 System controller
11a CPU
11b ROM
11c RAM
12 Display section
13 Operation part
14 Playback operation drive unit
15 Signal processing circuit
16 D / A converter
17 Amplifier circuit
18 Audio output terminal
101 disks

Claims (14)

In a playback device capable of playing a multi-session optical disc,
Reading means for reading each session recorded on the optical disc;
Extraction means for extracting a difference between information indicating a directory and a file included in each session read by the reading means and information indicating a directory and a file up to the previous session of each session;
Based on the difference extracted by the extracting means, reproducing means for reproducing the optical disc;
A playback apparatus comprising: The playback apparatus according to claim 1, further comprising a management unit that manages the difference extracted by the extraction unit in association with each session. 3. The playback apparatus according to claim 2, wherein the management unit manages data recorded on the optical disc by format. 4. The reproducing apparatus according to claim 2, wherein the reproducing unit reproduces the optical disc for each session based on a difference corresponding to each session managed by the managing unit. 5. The playback apparatus according to claim 1, further comprising changing means for changing hardware or software settings for each session. 6. The storage device according to claim 1, further comprising storage means for storing a start address and an end address of a lead-in area, an end address of a lead-out area, or a start address of a program area included in each session. The reproducing apparatus as described. 7. The display control unit according to claim 1, further comprising: a display control unit that displays a session number indicating the session and the number of sessions for which reading has been completed while the reading unit reads each session. The playback apparatus according to any one of the above. The display control unit causes the display unit to display the number of directories and files included in the session and the number of directories and files that have been read, during reading of each session by the reading unit. The playback apparatus according to claim 7. When the optical disc is reproduced, further comprising designation means for designating any one of reproduction of all sessions and reproduction of a session instructed by the user,
9. The reproducing apparatus according to claim 1, wherein the reproducing unit reproduces the optical disc based on a reproduction mode designated by the designation unit. To a computer that controls a playback device capable of playing a multi-session optical disc,
A reading function for reading each session recorded on the optical disc;
An extraction function for extracting a difference between information indicating a directory and a file included in each session read by the reading function and information indicating a directory and a file up to the previous session of each session;
A reproduction function for reproducing the optical disc based on the difference extracted by the extraction function;
A program to realize 11. The program according to claim 10, further comprising a management function for managing the difference extracted in the extraction function in association with each session. 12. The program according to claim 11, wherein the management function manages data recorded on the optical disc by format. The program according to claim 11 or 12, wherein the reproduction function reproduces the optical disc for each session based on a difference corresponding to each session managed by the management function. When the optical disc is played back, it further comprises a designation function for designating any one of the playback modes of playback of all sessions and playback of sessions instructed by the user,
The program according to any one of claims 10 to 13, wherein the reproduction function reproduces the optical disk based on a reproduction mode designated by the designation function.

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