JP4078538B2 - REPRODUCTION DEVICE AND METHOD, RECORDING MEDIUM, AND PROGRAM - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a playback apparatus and method, a recording medium, and a program. For example, a playback suitable for playing back a data file that is fragmented and recorded on an information recording medium according to the FAT (File Allocation Table) method. The present invention relates to an apparatus and method, a recording medium, and a program.
[0002]
[Prior art]
Conventionally, the FAT system is known as a format for recording and reproducing data files on a randomly accessible information recording medium such as a hard disk. The FAT method is the most popular file format method because personal computers equipped with an OS (Operating System) such as MS-DOS (trademark) and WINDOWS (registered trademark) are supported as standard. be able to.
[0003]
The FAT method will be described. As shown in FIG. 1, the recording area of the information recording medium in which data is recorded according to the FAT system is divided into physical recording units called sectors. Each sector has a predetermined capacity (for example, 512 bytes), and a sector address is assigned to each sector. Access to the information recording medium is performed in units of sectors.
[0004]
In addition, the recording area of the information recording medium is divided into logical recording units called clusters composed of a plurality of sectors (for example, 64 sectors). Each cluster is given a cluster address. Reading / writing of the file with respect to an information recording medium is performed per cluster.
[0005]
That is, when the size of the file to be recorded is larger than the capacity of one cluster, the file is divided and recorded in a plurality of clusters. On the other hand, when the size of the file to be recorded is less than the capacity of one cluster, only the file is recorded in one cluster.
[0006]
At a predetermined address in the recording area, a directory entry indicating the connection of the first cluster in which the file is recorded and a file allocation table (hereinafter referred to as FAT) indicating the connection of the cluster in which the file is recorded are recorded. Has been.
[0007]
In the directory entry, for each file, the file name, extension, attribute, reserved area, file creation time, file creation date, last access date, update date and time, and the data of the first part of the file are recorded. A cluster address (hereinafter referred to as a start cluster address), a file size, and the like are recorded.
[0008]
In the FAT, spaces corresponding to each of all clusters of the information recording medium are provided. Therefore, the larger the capacity of the information recording medium, the larger the FAT size. A FAT address is assigned to each FAT space.
[0009]
Information indicating whether the cluster of the cluster address CL0 is free or used is recorded in the space of the FAT address 0. As information indicating that the data has been used, if there is continuous data in the data recorded in the cluster having the cluster address CL0, the cluster address of the cluster in which the continuous data is recorded is recorded. When there is no continuous data in the data recorded in the cluster at the cluster address CL0 (that is, when the file ends with data recorded in the cluster at the cluster address CL0), EOF (End Of File) is used as an end mark. Is recorded.
[0010]
Similarly, information indicating whether the clusters of the cluster addresses CL1, 2, 3,... Are vacant or used is recorded in the spaces of the FAT addresses 1, 2, 3,.
[0011]
Note that the cluster address of the cluster in which the directory entry is recorded and the cluster address of the cluster in which the FAT is recorded are included in the management information recorded in the first sector of the information recording medium. The management information includes information indicating the capacity of the information recording medium and how many sectors each cluster is composed of.
[0012]
The directory entry and FAT will be described specifically. For example, as shown in FIG. 2, the file A is divided into files A-1 to A-18, each of which is a cluster address CL1, CL2, CL3, CL5, CL6, CL110, CL112, CL113, CL114 of the information recording medium. , CL115, CL116, CL119, CL320, CL323, CL324, CL328, CL329, and CL330. In this way, the division and recording of one file into non-contiguous clusters is called fragmentation.
[0013]
In this case, the cluster address CL1 is recorded as the start cluster address of the file A in the directory entry.
[0014]
On the other hand, in the FAT, as shown in FIG. 3, the cluster address CL2 is recorded in the space of the FAT address 1, the cluster address CL3 is recorded in the space of the FAT address 2, and the cluster address is recorded in the space of the FAT address 3. CL5 is recorded. Hereinafter, although description is omitted, EOF is finally recorded in the space of the FAT address 330.
[0015]
Next, a process of reading the file A recorded on the information recording medium as shown in FIG. 2 from the information recording medium by a conventional reproducing apparatus will be described.
[0016]
First, the directory entry of the information recording medium is referred to, and the starting cluster address (in this case, the cluster address CL1) of the file A is read.
[0017]
Next, the FAT recorded on the information recording medium is copied to a memory (DRAM (Dynamic Random Access Memory) etc.) built in the playback apparatus.
[0018]
As described above, after the FAT is copied to the built-in memory, reading of the file A-1 is started from the cluster having the cluster address CL1. In parallel with reading of the file A-1, the FAT address 1 of the FAT of the built-in memory is referred to, and the cluster address of the cluster in which the file A-2 is recorded (in this case, the cluster address CL2) is obtained. After the detection and the reading of the file A-1 are completed, the reading of the file A-2 is started from the cluster of the cluster address CL2. Similarly, the files A-3 to A-18 are read out.
[0019]
As described above, when reading a file, the FAT is frequently referred to. Therefore, the FAT copied on the memory built in the playback apparatus is referred to instead of referring to the FAT of the information recording medium so that the time required for this reference is shortened as much as possible. (For example, see Patent Document 1)
[0020]
[Patent Document 1]
JP-A-8-110868 (first page)
[0021]
[Problems to be solved by the invention]
Here, as shown in FIG. 2, the fragmented file A is AV (Audio and Visual) signal stream data encoded by, for example, MPEG (Moving Pictures Experts Group) 2 system or the like. And
[0022]
When this stream data is reproduced from an information recording medium (when it is read and decoded, and the resulting video is displayed on a display and audio is output), the stream data is fragmented and recorded. For this reason, it takes time to seek the read head of the information recording medium. For example, the reproduced video or audio may be interrupted, or the image may be lost or skipped. There was a problem that could be done.
[0023]
The present invention has been made in view of such circumstances, and an object thereof is to enable continuous reproduction of streaming data such as AV signals recorded on an information recording medium in accordance with the FAT system without delay. .
[0024]
[Means for Solving the Problems]
  The reproduction apparatus of the present invention is based on an acquisition unit that acquires an address of a unit recording area of an information recording medium in which a fragment of a data file is recorded from the information recording medium, and a table acquired by the acquisition unit, A designation means for designating a read address, a read means for reading a data file fragment from a unit recording area of the information recording medium corresponding to the read address designated by the designation means, and a fragment read by the read means are stored. A first storage means, a generation means for generating reread information based on the table acquired by the acquisition means, and a data file stored by the first storage means based on the reread information generated by the generation means Storage means for rearranging the fragments in the reproduction order and storing themReproduction means for reproducing the data file stored in the reproduction order in the second storage means;It is characterized by including.
[0025]
The table may be FAT.
[0026]
Based on the table acquired by the acquisition means, the designation means shortens the time required to read the address of the unit recording area where the fragment of the data file is recorded from the information recording medium regardless of the reproduction order of the fragments. As described above, the read address can be designated.
[0027]
The designation means designates the address of the unit recording area where no data file fragment is recorded, based on the table obtained by the obtaining means, as a read address so that the time required for reading from the information recording medium is shortened. Can be.
[0028]
The reading means can read data that is not a fragment of a data file from the unit recording area of the information recording medium corresponding to the read address specified by the specifying means, and the first storage means Data that is not a fragment read by the means can also be stored.
[0030]
  In the reproducing method of the present invention, the table indicating the address of the unit recording area of the information recording medium in which the data file fragment is recorded is acquired from the information recording medium and the table acquired in the processing of the acquiring step. Based on the designation step for designating the readout address, the readout step for reading out the data file fragment from the unit recording area of the information recording medium corresponding to the readout address designated in the processing of the designation step, and the readout in the processing of the readout step Based on the first storage step for storing the fragment obtained, the generation step for generating reread information based on the table acquired in the processing of the acquisition step, and the reread information generated in the processing of the generation step. The pieces of data files stored in the processing of one storage step are arranged in the playback order. A second storage step of Ete storesA reproduction step of reproducing the data file stored in the reproduction order by the processing of the second storage step;It is characterized by including.
[0031]
  The recording medium program of the present invention is acquired by the acquisition step of acquiring the table indicating the address of the unit recording area of the information recording medium in which the fragment of the data file is recorded, and the processing of the acquisition step. Based on the table, a designation step for designating a read address, a read step for reading a fragment of the data file from the unit recording area of the information recording medium corresponding to the read address designated in the process of the designation step, and a process of the read step Based on the first storage step for storing the read fragment, the generation step for generating reread information based on the table acquired in the processing of the acquisition step, and the reread information generated in the processing of the generation step The data file fragment stored in the process of the first storage step is A second storage step of storing rearrange the raw sequenceA reproduction step of reproducing the data file stored in the reproduction order by the processing of the second storage step;It is characterized by including.
[0032]
  The program of the present invention is based on an acquisition step for acquiring an address of a unit recording area of an information recording medium in which a fragment of a data file is recorded from the information recording medium, and a table acquired in the processing of the acquisition step. A read step that reads a data file fragment from the unit recording area of the information recording medium corresponding to the read address specified in the specified step, the read step that specifies the read address, and the read step process. A first storage step for storing the fragments, a generation step for generating reread information based on the table acquired in the processing of the acquisition step, and a first step based on the reread information generated in the processing of the generation step. Data file fragments stored in the storage step process A second storage step of storing in place fineA reproduction step of reproducing the data file stored in the reproduction order by the processing of the second storage step;It is characterized by causing a computer to execute a process including:
[0033]
  In the reproducing apparatus and method and the program of the present invention, the data file fragment is read out and stored from the unit recording area of the information recording medium corresponding to the designated read address. Further, based on the generated reread information, the stored data file fragments are rearranged in the playback order and stored,The data file stored in the playback order is played back.
[0034]
The playback device may be an independent device, or may be a block that executes playback of a recording / playback device such as a digital video camera.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an AV playback apparatus according to an embodiment of the present invention will be described with reference to the drawings.
[0036]
The AV playback apparatus plays back the streaming data of the AV signal recorded on the information recording medium 3 (FIG. 4) in accordance with the FAT system continuously and without any delay.
[0037]
FIG. 4 shows a configuration example of the AV playback apparatus. The control unit 1 reads a control program stored in a recording medium 2 composed of a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, and controls each part of the AV playback device according to the read control program.
[0038]
  For example, in a randomly accessible information recording medium 3 composed of a hard disk, a micro disk, etc., a file B which is streaming data of an AV signal is shown in FIG.YouSo that it is fragmented and recorded. That is, the file B is fragmented into files B-1 to A-10, and each of them is clustered into the cluster of the cluster address CL24, CL25, CL23, CL26, CL27, CL31, CL36, CL37, CL40, CL38 of the information recording medium 3. It is recorded.
[0039]
It is assumed that data X1 to X8 unrelated to the file B are recorded between the clusters in which the file B is recorded after being fragmented.
[0040]
The information recording medium 3 records a directory entry including information on the file B and FAT. In the directory entry, the cluster address CL24 is recorded as the start cluster address of the file B.
[0041]
FIG. 6 shows a part related to FAT file B. For example, the cluster address CL25 of the cluster in which the file B-2 is recorded is recorded in the FAT space corresponding to the cluster address CL24 of the cluster in which the file B-1 is recorded. Further, for example, the cluster address CL23 of the cluster in which the file B-3 is recorded is recorded in the FAT space corresponding to the cluster address CL25 of the cluster in which the file B-2 is recorded.
[0042]
Returning to FIG. The reading unit 4 reads the directory entry and FAT recorded on the information recording medium 3 and outputs them to the reading address generation unit 5. The reading unit 4 reads data (fragmented files and other data) from the information recording medium 3 according to the read address of the information recording medium 3 input from the read address generation unit 5 and outputs the data to the data buffer 6. To do.
[0043]
The read address generation unit 5 generates a read address so that a file can be efficiently read based on the directory entry and FAT input from the read unit 4 and outputs the read address to the read unit 4 and the reorder information generation unit 7. To do. The data buffer 6 stores the data input from the reading unit 4 in the input order.
[0044]
The reorder information generation unit 7 generates reorder information indicating the correspondence between the storage area address of the data buffer 6 and the reading order based on the read address input from the read address generation unit 5 and outputs the reorder information to the reorder unit 8. .
[0045]
The reorder unit 8 reads out the file fragments stored in the data buffer 6 based on the reorder information input from the reorder information generation unit 7 and outputs them to the reorder buffer 9 in the order of constituting the original file. The reorder buffer 9 stores the pieces of the file read from the data buffer 6 by the reorder unit 8 in the order of input. The decoding unit 10 reads and decodes the file recorded in the reorder buffer 9, and outputs the obtained video signal and audio signal to a subsequent display or speaker (both not shown), respectively.
[0046]
Next, the reproduction processing of the file B that is fragmented and recorded on the recording medium 3 by the AV reproduction apparatus will be described with reference to the flowchart of FIG.
[0047]
In step S <b> 1, the reading unit 4 reads the directory entry and FAT from the information recording medium 3 and outputs them to the read address generation unit 5. In step S2, the read address generation unit 5 generates a read address so that the file can be efficiently read based on the directory entry and FAT input from the read unit 4, and generates the read unit 4 and the reorder information. Output to unit 7.
[0048]
The read address generation process in step S2 will be described with reference to the flowchart of FIG.
[0049]
In step S <b> 11, the read address generation unit 5 refers to the FAT input from the read unit 4, where the clusters in which the fragments of the file B are recorded are not continuous (hereinafter referred to as discontinuous points). Is detected. In this case, the cluster addresses CL28 to CL30 are detected as the first discontinuous points, the cluster addresses CL32 to CL35 are detected as the second discontinuous points, and the cluster address CL39 is detected as the third discontinuous point.
[0050]
In step S12, the read address generation unit 5 detects the number of clusters at each discontinuous point. In this case, 3 clusters are detected as the number of clusters at the first discontinuous point, 4 clusters are detected as the number of clusters at the second discontinuous point, and 1 cluster is detected as the number of clusters at the third discontinuous point.
[0051]
In step S <b> 13, the read address generation unit 5 takes the time required to read, for each discontinuous point, data X unrelated to the file B recorded in the discontinuous point cluster following the file B fragment. a is calculated.
[0052]
Specifically, for the first discontinuous point, subsequent to the reading of the file B-5, the time a1 = 3 × tc required when the data X1 to X3 are also read is calculated. For the second discontinuous point, subsequent to the reading of the file B-6, the time a2 = 4 × tc required when the data X4 to X7 are also read is calculated. For the third discontinuous point, subsequent to the reading of the file B-10, the time a3 = 1 × tc required for reading the data X8 is calculated. Here, tc is the time required to continuously read out data for one class.
[0053]
In step S <b> 14, the read address generation unit 5 calculates the time “b” required for skipping the data X unrelated to the file B recorded in the discontinuous point cluster for each discontinuous point.
[0054]
Specifically, for the first discontinuous point, after reading the file B-5 recorded in the cluster having the cluster address CL27, the time b1 for seeking to the cluster having the cluster address CL31 is calculated. For the second discontinuous point, after reading the file B-6 recorded in the cluster of the cluster address CL31, a time b2 for seeking to the cluster of the cluster address CL36 is calculated. For the third discontinuous point, after reading the file B-10 recorded in the cluster having the cluster address CL38, a time b3 for seeking the cluster having the cluster address CL40 is calculated.
[0055]
In step S15, the read address generation unit 5 compares the times a and b calculated in steps S13 and S14 for each discontinuous point. For the discontinuous point where it is determined that the time a is longer than the time b, the process proceeds to step S16, and the read address generation unit 5 designates the read address so as to skip the irrelevant data X.
[0056]
On the other hand, for a discontinuous point in which it is determined that time a is not longer than time b, the process proceeds to step S17, and the read address generation unit 5 reads the irrelevant data X following the reading of the file B fragment. Specify the read address.
[0057]
The processing of steps S15 to S17 will be specifically described. For example, when it is determined that time a1> time b1 is satisfied for the first discontinuous point, a cluster address CL31 that is separated from the cluster addresses CL23, CL24, CL25, CL26, and CL27 is designated as a read address. The For the second discontinuous point, when it is determined that time a2> time b2 holds, a cluster address CL36 that is separated from the cluster address CL31 is designated as a read address. For the third discontinuous point, when it is determined that time a3> time b3 does not hold, the cluster address CL39 in which irrelevant data X8 is recorded is designated as the read address following the cluster address CL38. .
[0058]
Therefore, in this case, cluster addresses CL23, CL24, CL25, CL26, CL27, CL31, CL36, CL37, CL38, CL39, and CL40 are sequentially specified as read addresses.
[0059]
In step S18, the read address generation unit 5 sequentially reads the cluster addresses CL23, CL24, CL25, CL26, CL27, CL31, CL36, CL37, CL38, CL39, and CL40 as read addresses, and the reorder information generation unit 7. Output to. This is the end of the description of the read address generation process.
[0060]
The process returns to step S3 in FIG. In step S <b> 3, the reading unit 4 reads the data recorded in the cluster of the information recording medium 3 corresponding to the read address input from the read address generation unit 5 and outputs the data to the data buffer 6. In step S4, the data buffer 6 buffers the data input from the reading unit 4 in the input order.
[0061]
In this case, the files B-3, B-1, and B recorded in the clusters of the cluster addresses CL23, CL24, CL25, CL26, CL27, CL31, CL36, CL37, CL38, CL39, and CL40 of the information recording medium 3 are used. -2, B-4, B-5, B-6, B-7, B-8, B-10, data X8, and file B-9 are read out, as shown in FIG. In this order, the data are buffered in the addresses DB0 to DB10 of the data buffer 6.
[0062]
In step S 5, the reorder information generation unit 7 generates reorder information indicating the correspondence between the storage area address of the data buffer 6 and the reading order based on the read address input from the read address generation unit 5. Output to.
[0063]
In this case, as shown in FIG. 10, the data buffered at the address DB1 of the data buffer 6 is the 0th data, the data buffered at the address DB2 is the first, and the data buffered at the address DB0. Is second, data buffered at address DB3 is third, data buffered at address DB4 is fourth, data buffered at address DB5 is fifth, buffered at address DB6 Indicates that the data buffered at address DB7 is read seventh, the data buffered at address DB10 is eighth, the data buffered at address DB8 is read ninth. Reorder information is generated.
[0064]
The reorder information includes that the data buffered in the address DB 9 of the data buffer 6 is invalid data that is not related to the file B.
[0065]
The process of step S5 may be executed in parallel with the processes of steps S3 and S4 described above.
[0066]
In step S6, the reorder unit 8 converts files B-1 to B-8, which are fragments of the file B stored in the data buffer 6, into file B based on the reorder information input from the reorder information generation unit 7. Read in the order of configuration and output to the reorder buffer 9. The reorder buffer 9 buffers files B-1 to B-8, which are fragments of the file B read from the data buffer 6 by the reorder unit 8, in the order of input as shown in FIG.
[0067]
In step S8, the decoding unit 10 reads and decodes the file recorded in the reorder buffer 9. This is the end of the description of the playback process.
[0068]
According to the reproduction processing described above, the files B-1 to B-10 distributed and recorded on the recording medium 3 are sequentially arranged and buffered in the reorder buffer 9, so The file B can be supplied without any.
[0069]
Further, according to the reproduction process described above, even if the files are not distributed on the recording medium 3, for example, file fragments recorded in an order different from the reproduction order are also arranged and buffered in the reorder buffer 9 in order. Therefore, the file B can be supplied to the decoding unit 10 without delay.
[0070]
Therefore, it is possible to prevent image omission and sound skipping from occurring in the video signal and audio signal output from the decoding unit 10.
[0071]
The present invention can be applied to an AV recording / reproducing apparatus and a digital video camera having a recording function in addition to the AV reproducing apparatus according to the present embodiment.
[0072]
Further, the present invention can be applied not only to a device that reproduces AV signal streaming data, but also to other devices that read streaming data.
[0073]
Furthermore, the present invention can be applied to an apparatus for recording any data on an information recording medium formatted by the FAT method.
[0074]
By the way, the series of processes described above can be executed by hardware, but can also be executed by software. When a series of processes is executed by software, a computer (for example, the control unit 1 in FIG. 4) in which the program constituting the software is incorporated in dedicated hardware or various programs are installed. Thus, it is installed from a recording medium (for example, the recording medium 2 in FIG. 4) into a general-purpose personal computer or the like capable of executing various functions.
[0075]
The recording medium is distributed to provide a program to the user separately from the computer, and includes a magnetic disk (including a flexible disk) on which the program is recorded, an optical disk (CD-ROM (Compact Disc-Read Only Memory)) , DVD (Digital Versatile Disc)), magneto-optical disc (MD (Mini Disc)), or package media consisting of semiconductor memory, etc. Consists of a ROM, hard disk, etc. provided with programs.
[0076]
In the present specification, the step of describing the program recorded in the recording medium is not limited to the processing performed in time series according to the described order, but is not necessarily performed in time series, either in parallel or individually. The process to be executed is also included.
[0077]
【The invention's effect】
As described above, according to the present invention, streaming data such as AV signals recorded on an information recording medium can be continuously reproduced without delay.
[Brief description of the drawings]
FIG. 1 is a diagram showing sectors that are physical recording units and clusters that are logical recording units of an information recording medium.
FIG. 2 is a diagram illustrating a state in which a file is fragmented and distributed and recorded in a cluster.
3 is a diagram showing an example of a FAT corresponding to a file recorded in the state shown in FIG. 2. FIG.
FIG. 4 is a block diagram showing a configuration example of an AV playback device according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an example of a state in which a file is fragmented and recorded on a recording medium.
6 is a diagram showing an example of a FAT corresponding to a file recorded in the state shown in FIG.
7 is a flowchart for explaining playback processing by the AV playback device of FIG. 4; FIG.
FIG. 8 is a flowchart illustrating the process of step S2 of FIG.
FIG. 9 is a diagram illustrating an example of data buffered in a data buffer.
FIG. 10 is a diagram illustrating an example of reorder information.
FIG. 11 is a diagram illustrating an example of a file buffered in a reorder buffer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Control part, 2 Recording medium, 3 Information recording medium, 4 Reading part, 5 Reading address production | generation part, 6 Data buffer, 7 Right order information production | generation part, 8 Reorder part, 9 Reorder buffer, 10 Decoding part

Claims (8)

In a playback device for playing back a data file that is fragmented and recorded on an information recording medium,
Obtaining means for obtaining from the information recording medium a table indicating an address of a unit recording area of the information recording medium in which a fragment of the data file is recorded;
Based on the table acquired by the acquiring means, a specifying means for specifying a read address;
Reading means for reading a fragment of the data file from a unit recording area of the information recording medium corresponding to the reading address specified by the specifying means;
First storage means for storing the fragment read by the reading means;
Generating means for generating reread information based on the table acquired by the acquiring means;
Based on the reread information generated by the generating means, a second storage means for storing the pieces of the data file stored by the first storage means in a reproduction order ; and
A playback device comprising: playback means for playing back the data files stored in the playback order in the second storage means . The playback apparatus according to claim 1, wherein the table is FAT. The designation means, based on the table obtained by the obtaining means, assigns the address of the unit recording area where the fragment of the data file is recorded, from the information recording medium regardless of the reproduction order of the fragments. The playback apparatus according to claim 1, wherein the read address is specified so that a time required for reading is shortened. Based on the table acquired by the acquisition unit, the designation unit is configured to reduce the time required for reading the address of the unit recording area in which the data file fragment is not recorded from the information recording medium. The playback apparatus according to claim 1, wherein the read address is designated. The reading means also reads data that is not the fragment of the data file from the unit recording area of the information recording medium corresponding to the read address specified by the specifying means,
The playback apparatus according to claim 4, wherein the first storage unit also stores non-fragment data read by the reading unit. In a playback method of a playback device for playing back a data file that is fragmented and recorded on an information recording medium,
An acquisition step of acquiring from the information recording medium a table indicating an address of a unit recording area of the information recording medium in which a fragment of the data file is recorded;
A designation step for designating a read address based on the table acquired in the processing of the acquisition step;
A reading step of reading a fragment of the data file from a unit recording area of the information recording medium corresponding to the reading address specified in the processing of the specifying step;
A first storage step of storing the fragment read in the processing of the reading step;
Based on the table acquired in the processing of the acquisition step, a generation step of generating reread information,
A second storage step for storing the pieces of the data file stored in the processing in the first storage step in the order of reproduction based on the reread information generated in the processing in the generation step ;
A reproduction step of reproducing the data files stored in the reproduction order by the processing of the second storage step . A program for controlling a playback device that plays back a data file that is fragmented and recorded on an information recording medium,
An acquisition step of acquiring from the information recording medium a table indicating an address of a unit recording area of the information recording medium in which a fragment of the data file is recorded;
A designation step for designating a read address based on the table acquired in the processing of the acquisition step;
A reading step of reading a fragment of the data file from a unit recording area of the information recording medium corresponding to the reading address specified in the processing of the specifying step;
A first storage step of storing the fragment read in the processing of the reading step;
Based on the table acquired in the processing of the acquisition step, a generation step of generating reread information,
A second storage step for storing the pieces of the data file stored in the processing in the first storage step in the order of reproduction based on the reread information generated in the processing in the generation step ;
A recording medium on which a computer-readable program is recorded, comprising: a reproduction step of reproducing the data file stored in the reproduction order by the processing of the second storage step . A program for controlling a playback device that plays back a data file that is fragmented and recorded on an information recording medium,
An acquisition step of acquiring from the information recording medium a table indicating an address of a unit recording area of the information recording medium in which a fragment of the data file is recorded;
A designation step for designating a read address based on the table acquired in the processing of the acquisition step;
A reading step of reading a fragment of the data file from a unit recording area of the information recording medium corresponding to the reading address specified in the processing of the specifying step;
A first storage step of storing the fragment read in the processing of the reading step;
Based on the table acquired in the processing of the acquisition step, a generation step of generating reread information,
A second storage step for storing the pieces of the data file stored in the processing in the first storage step in the order of reproduction based on the reread information generated in the processing in the generation step ;
A program for executing a process including a reproduction step of reproducing the data file stored in the reproduction order by the process of the second storage step .

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