JPH0675833A - File managing device - Google Patents

Abstract

PURPOSE:To divide an original file into plural files so that these divided files can be read out successively to execute smoothly reverse reproduction without requiring the time for reading in data. CONSTITUTION:A file dividing part 1 divides a file into plural divided files in order that they can be managed. A control file generating part 2 generates a divided file control file in which its sequence is registered, with respect to plural divided files divided by this file dividing part 1. Subsequently, a data reading-in part 3 reads in successively data from plural divided files, based on the divided file control file generated by the control file generating part 2. A reverse reproducing part 4 executes a reverse reproduction processing of the divided file read in such a way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file management device, and more particularly to a file management device capable of reverse reproduction of a file using a file allocation table (FAT).

[0002]

2. Description of the Related Art FA of currently used MS-DOS
In a file system that manages files using T, the disks are managed by preparing a table for each disk. And this FAT has only a forward pointer. Therefore, in the case of reading data in the forward direction, corresponding data is read from the first FAT entry number in the file directory while sequentially referring to the FAT.

As shown in FIG. 7, the structure of FAT is as follows.
Since it only has a connection in the forward direction, the connection in the reverse direction is unknown. Therefore, when reading the data in the reverse direction, it is necessary to follow the connection from the head of the FAT to the target FAT portion every time the data is read.

[0004]

As described above, the FA
Since the connection of T is only in the forward direction, the case of reading data in the forward direction is good, but in the case of reading data in the reverse direction, the connection of the FAT is followed from the beginning every time the data is read. For this reason, a short file is not so affected, but if the size is large, such as a moving image data file, the efficiency becomes poor. In particular, reverse reproduction of the latter half of the file requires a long time to read the data, and smooth reverse reproduction cannot be performed.

The present invention has been made in view of the above problems, and even when reading data in the reverse direction, it is not necessary to follow the connection of the FAT from the beginning every time the data is read, and it takes time to read the data. An object of the present invention is to provide a file management device that can perform smooth reverse playback without doing so.

[0006]

That is, the present invention relates to a file management device for managing a file using a file allocation table, and a file dividing means for dividing the file into a plurality of divided files, and the file dividing means. Based on the divided file control file created by the control file creating means for creating a divided file control file in which the order is registered for a plurality of divided files created by the means, and the divided file control file created by the control file creating means,
It is characterized by further comprising a reading means for sequentially reading data from the plurality of divided files and a means for reversely reproducing the divided files read by the reading means.

[0007]

The file management apparatus of the present invention manages files using the file allocation table. The above file is created by the file dividing means.
Split into multiple split files. With respect to the plurality of divided files divided by the file dividing means, a divided file control file in which the order is registered is created by the control file creating means. Then, the reading means sequentially reads data from the plurality of divided files based on the divided file control file created by the control file creating means. The divided files thus read are reversely reproduced by the reverse reproduction means.

[0008]

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

FIG. 1 is a functional block diagram showing the concept of the first embodiment of the file management apparatus of the present invention. In the figure, the contents of the file to be managed are supplied to the file dividing unit 1, and further supplied to the control file creating unit 2 to create the divided file control file. The data reading unit 3 reads the data from the file dividing unit 1 and the control file creating unit, and outputs the read data to the reverse reproducing unit 4.

In the file management device having such a configuration, a file, for example, a moving image data file, to be managed is first divided into a plurality of files by the file dividing unit 1. Here, when the moving image data file is registered, it is divided into files that are not affected by smooth reproduction even if reverse reproduction is performed while following the FAT. At this time, there are a method of creating a control file in which the order of the divided files is registered, and a method of adding a number indicating the order to the divided file names. For a plurality of split files split by the file splitting unit 1,
The control file creation unit 2 creates a split file control file in which the order is registered.

FIG. 2 shows an example of the divided file control file created by the control file creating section 2 in which the numbers indicating the order are added to the divided file names. Now, the moving image data file is divided into file names “file1, file2, file3, ...” In accordance with the registered sequence numbers “1, 2, 3, ...”. The frames of the respective divided files are “0-100, 101-200, 201-300,
... "is set.

Based on the divided file control file created in this way, the data reading unit 3 sequentially reads data from the plurality of divided files. And
The read division file is reversely reproduced by the reverse reproduction unit 4. Next, with reference to the flowchart of FIG. 3, an operation of reversely reproducing the divided files divided as described above will be described.

If the divided files are moving image data, each moving image divided file is opened (step S1). Here, if an open error occurs (step S2), an error notification is given by a display device (not shown) or the like (step S3). On the other hand, if there is no error, according to the sequence number added to the next divided file,
The divided file is selected (step S4).

Next, reverse reproduction is performed for each divided file based on the selected sequence number (step S5). Then, it is determined whether or not the divided file for which the reverse reproduction is performed has reached the file end (step S6). When the divided file is reversely reproduced to the end, it is determined whether or not there is another divided file for reverse reproduction (step S7). If there is no divided file, the operation is terminated, and if there is, a step S
Returning to step 4, steps S4 to S7 are repeated thereafter.

As described above, in the file management apparatus using the FAT, when a file having a large amount of data such as moving image data is reversely reproduced, a plurality of divided files are sequentially read out, so that a smooth reverse operation is performed. Playback can be performed. Next, a second embodiment of the present invention will be described. FIG. 4 is a functional block diagram showing the concept of the second embodiment of the file management device of the present invention.

In the figure, the contents of the file to be managed are supplied to the search unit 5, and the block number is supplied to the block number registration unit 6 of a recording medium, such as a disk. The data reading unit 3 reads the data from the searching unit 5 and the block number registering unit 6, and outputs the read data to the reverse reproducing unit 4. Next, FIG. 5 and FIG.
The operation of the second embodiment will be described with reference to FIG.

If the divided files are moving image data, each moving image divided file is opened (step S11). Here, if an open error occurs (step S12), an error notification is given by a display device (not shown) or the like (step S13). On the other hand, if there is no error, the FAT is analyzed (step S15).
That is, the FA of the moving image data file should be managed.
The T section is searched by the search section 5, and the block number of the data section on the medium used, for example, the disk, is acquired.
The block numbers of the data portion on the disc obtained here are registered in the block number registration portion 6 by creating a block number order table in the order of reproduction (step S1).
5).

FIG. 5 shows the connection of FAT.
Information about which block on the disk is used, that is, the block number is acquired in advance and stored in the memory.

Here, when reproduction is performed (step S16), a sequence number corresponding to the reproduction position is set (step S17). Next, the program number corresponding to the sequence number is acquired from the block number sequence table (step S18). Then, based on the block number order table, the data reading unit 3 sequentially reads the moving image data from the data unit (step S1).
9). The moving image data read in this way is reproduced by the reverse reproduction unit 4
Then, the reverse reproduction process is performed (step S20).

This is because the FAT of the moving image file to be reproduced is searched in advance, a table in which the block numbers of the data areas to be used are arranged in order, and the table is stored in the memory. FA when reading
The block number of the data area can be directly known without accessing the T portion, so that the reproduction is smoothed.

[0021]

As described above, according to the present invention, even when data is read in the reverse direction, FAT is read every time data is read.
It is not necessary to follow the connection from the beginning, and it is possible to provide a file management device that can perform smooth reverse reproduction without requiring time to read data.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing the concept of a first embodiment of a file management device of the present invention.

FIG. 2 is a diagram showing an example of a divided file control file created by a control file creation unit 2 in FIG.

FIG. 3 is a flowchart illustrating the operation of the first embodiment.

FIG. 4 is a functional block diagram showing the concept of a second embodiment of the file management device of the present invention.

FIG. 5 is a diagram schematically showing connection of FATs according to a second embodiment.

FIG. 6 is a flowchart illustrating the operation of the second embodiment.

FIG. 7 is a diagram schematically showing a connection of conventional FATs.

[Explanation of symbols]

1 ... File dividing unit, 2 ... File creating unit, 3 ... Data reading unit, 4 ... Reverse reproduction unit, 5 ... Search unit, 6 ... Block number registration unit.

Claims (1)

[Claims] 1. A file management device for managing files using a file allocation table, and a file dividing means for dividing the file into a plurality of divided files, and a plurality of divided files divided by the file dividing means. A control file creating means for creating a split file control file in which the order is registered for, and a reading means for sequentially reading data from the plurality of split files based on the split file control file created by the control file creating means. And a means for reversely reproducing the divided files read by the reading means.