JP2004334969A - Method for recording multifile in real time and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of the impossibility of guaranteeing the real timeness of recording/reproducing due to frequent head seeking between the areas for recording a plurality of files when a plurality of data having real timeness are simultaneously recorded/reproduced in/from different files by using a file system. <P>SOLUTION: When a plurality of data having real timeness are recorded, the plurality of data are multiplexed and continuously recorded as 1-dimensional data, and file management information is updated so as to manage the data as the different files. When the plurality of data having real timeness are reproduced, a plurality of file reading addresses are sorted in the order of the addresses on a medium to continuously read the data with minimum head seeking, and subsequently the data are classified in different files based on the file management information to obtain a plurality of reproduced data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for simultaneously recording or reproducing real-time data in a plurality of files in parallel.
[0002]
[Prior art]
With the transition of recording media from tape media to disk media and memory media, systems for recording and reproducing data in a form that can be recognized as files have become widespread. A typical example is a data file that is recorded and played back by a computer.However, recording and playback of files handled by a computer often do not guarantee real-time performance, and are tuned to operate at the best speed and the best effort. . However, in the case of recording / reproducing real-time data such as audio and video as a file, if the writing / reading is delayed due to random access of a recording medium, the sound or video is disturbed. Therefore, a standard that can guarantee real-time performance in applications for recording and reproducing audio and video has been formulated.
[0003]
For example, in “DVD Specifications for Rewritable / Re-recordable Discs”, real-time recording and reproduction of audio and video using an optical disk medium is defined as a standard. According to the standard, real-time performance can be guaranteed by encoding audio and video into an MPEG2 program stream and recording / reproducing it as a single file in a continuous address area of a recording medium having a certain length or more. This requires a seek operation to physically move the pickup of the optical disk drive at the point where the recording address becomes discontinuous, thus avoiding frequent seeks that prevent data from being written or read from occurring frequently. To do that. In this way, in recording / reproducing on a single file, real time performance can be guaranteed by suppressing the occurrence of seek in the file.
[0004]
Japanese Patent Application Laid-Open No. 2001-67802 proposes a method of interleaving and alternately recording data of a plurality of channels in a multi-channel recording apparatus and recording method. If a plurality of channels are recorded irregularly, an unpredictable seek occurs between the channels, so that real-time performance can be guaranteed by sequentially interleaving the data of each channel and recording continuously.
[0005]
[Patent Document 1]
JP 2001-67802 A
[Problems to be solved by the invention]
However, it is not possible to record data in a separate file for each channel using a file system only by recording data in a continuous area of a medium. In order to have a structure that can be independently recognized as a file, it is necessary to generate and record file management information in a file system. Generally, the area where the file management information is recorded is located at a position distant from the data recording area, and a seek occurs in reading and writing data and reading and writing the file management information. Since the interruption of the recording / reproducing operation due to the seek impairs the real-time performance, there is a problem that the real-time performance cannot be guaranteed unless the control of the file management information is updated or read out is reliably performed.
[0007]
[Means for Solving the Problems]
Therefore, in the present invention, as a method of actively controlling a seek condition among a plurality of files, a method of recording a plurality of real-time data in a separate file in parallel by using a file system is called a file system. A free space securing means for securing a free recording area in a continuous address area of a recording medium, and dividing a plurality of pieces of real-time data to be recorded into fragments in units of error correction coding blocks of a medium for individually recording. A data dividing means, a multiplexing means for time-division multiplexing the data fragments divided by the data dividing means at a rate corresponding to a data rate for recording the data fragments into one-dimensional data, Multiplexing order storage means for storing the order in which the data has been multiplexed, and securing the free space in the multiplexed data. The recording means for recording in the continuous address area of the recording medium secured in advance in the stage, and the file system management information is updated according to the information of the multiplexing order storage means after the recording of all the multiplexed data fragments is completed. An object of the present invention is to provide a multi-file real-time recording method, comprising a file management information updating unit for dividing a file into a plurality of files.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0009]
(Embodiment 1)
The first and second embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of Embodiment 1 of the present invention, and FIG. 2 shows the operation of a free area securing unit. In FIG. 1, reference numeral 100 denotes a file system for managing files on a recording medium; 101, a free area securing means for securing a free recording area in a continuous area for the file system; and 102 and 103, real-time input data 1 to be recorded And input data 2, 104 and 105 are data dividing means 1 and data dividing means 2, 106 for dividing into two pieces of real-time data 1 and data 2 to be recorded, which are error-correction coded block units of a medium for recording data 2. Is a multiplexing means for performing time-division multiplexing at a rate corresponding to a data rate for individually recording the divided data fragments into one-dimensional data, and 107 multiplexing what kind of data and in what order in the multiplexing means A multiplexing order storage means 108 for storing whether or not the multiplexed data has been stored in advance by the empty area securing means. Recording means 109 for recording in a continuous area which has been recorded, file management for updating the file system management information in accordance with the information in the multiplexing order storage means and dividing the file into a plurality of files after all the multiplexed data fragments have been recorded This is information updating means. In FIG. 2, reference numerals 201 and 202 denote the real-time input data 1 and input data 2 capacities, 203 a free space capacity secured by the free space securing means, and 204 a state after data recording. ing. The operation of the multi-file real-time recording system configured as described above will be described below.
[0010]
The real-time input data 1 and the real-time input data 2 are recorded using a general file system 100 that divides the data into fragments and records the fragments on the medium, and records the reproduction order of the recorded fragments on the medium as file management information. In a system in which two files are recorded simultaneously in parallel, the free space securing means 101 removes free space from the file system 100 by the total capacity 203 of real-time input data 1 and input data 2 to be recorded as shown in FIG. Secure. The input data 1 and the input data 2 are divided by the data dividing means 1 and the data dividing means 2 into the size of the error correction coding block of the medium to be recorded, and the multiplexing means 106 sets the data rate of the input data 1 and the input data 2 to the data rate. The data is time-division multiplexed at a proportion corresponding to a one-dimensional data sequence. At this time, the multiplexing order storage means 107 stores the order in which the data is time-division multiplexed and made one-dimensional. The recording means 108 records the data sequence arranged in one-dimensional data by the multiplexing means 106 in the recording area secured by the free space securing means 101. As a result, the recorded data 204 is in a state as shown in FIG. When the recording of all data is completed, the file management information updating means 109 updates the file management information according to the multiplexing order storage means 107 so that the input data 1 and the input data 2 can be correctly read as separate files.
[0011]
By operating as described above, two input data 1 and input data 2 having real-time properties are alternately recorded in the continuous address area, so that the head seek between the recording of the input data 1 and the input data 2 is performed. Does not occur. Further, since the file management information is updated as two independent files, the input data 1 and the input data 2 can be read as separate files. Continuously recording two different real-time data as one-dimensional data and updating the file management information to be separate files guarantee the real-time data recording provided by the present invention.
[0012]
In the first embodiment, an example of two real-time input data is described. However, the number of input real-time input data is not limited to two, and a larger number of input data may be used. Absent.
[0013]
(Embodiment 2)
Next, a third embodiment of the present invention will be described with reference to FIGS. The first embodiment is characterized in that the free area securing means 101 reserves a free area in advance by the total capacity of the input data 1 and the input data 2, but in the second embodiment, it is described in claim 3. As described above, first, a free space is secured by a predetermined capacity and a recording operation is started (corresponding to the first capacity of the capacity 303 secured by the free space securing means in FIG. 3). When the recording is completed by the reserved capacity, the file management information updating unit 109 partially updates the management information according to the file recording state at that time. Further, if the input data 1 or input data 2 to be recorded still continues, the empty area securing means 101 secures an empty area again by a predetermined capacity and continues the recording operation (the second and third times in FIG. 3). Equivalent).
[0014]
By operating in this way, it is possible not only to continue the recording operation in advance for a live input in which the end of the input data 1 and the input data 2 is unknown, but also by a predetermined capacity. Even if the recording operation is stopped due to some kind of failure because the file management information is updated when the recording is completed, the file information up to the point at which the file management information was updated immediately before is saved. It is possible to avoid the risk of losing recorded information.
[0015]
Although the example of two real-time input data has been described in the second embodiment, the number of input real-time input data is not limited to two, and a larger number of input data may be used. Absent. Further, an example of three times of the number of repetitions of the area reservation by the free area reserving means is shown, but the same operation is performed for one or more repetitions.
[0016]
(Embodiment 3)
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 shows an area opening operation according to the third embodiment of the present invention. In FIG. 4, reference numeral 401 denotes a state of recorded data, and 402 denotes a state in which an unrecorded area is opened.
[0017]
As described in the second embodiment, when the securing of the free area is secured by a predetermined capacity in advance, an unused area may be left at the end of the input data. Even if the area is left as it is, there is no problem in the recording operation, but the use efficiency of the recording medium may be deteriorated. Therefore, in the case where the end of the recording data is shorter than the reserved free space, an unrecorded reserved area is released. As a result, it is possible to effectively use the vacant area that is left unnecessarily secured in the subsequent recording.
[0018]
(Embodiment 4)
Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram of claim 5, which stores the multiplexing order of input data by ID. In FIG. 5, reference numerals 501 and 502 denote input data 1 and input data 2 and 503 which are two pieces of real-time input data to be recorded. A multiplexing means 504 for performing time-division multiplexing at a rate corresponding to a data rate at which fragments are individually recorded into one-dimensional data, and stores, by ID, which type of data is multiplexed in the multiplexing means and in which order. A multiplexing order storage means 505 is a file for updating management information of the file system according to the ID information of the multiplexing order storage means and dividing the file into a plurality of files after all the multiplexed data fragments have been recorded. This is management information updating means.
[0019]
The multiplexing means 503 performs time-division multiplexing on the data divided into pieces in units of error-correction coded blocks of the recording medium at a rate corresponding to the data rate for individually recording to form one-dimensional data, and the multiplexing order. Is transmitted to the multiplexing order storage means 504 as an ID. The multiplexing order storage means stores the ID and transmits the information to the file management information updating means 505. When updating the file management information, the file management information updating unit 505 updates the file management information according to the output of the multiplexing order storage unit 504 so that the data fragments having the same ID become the same file.
[0020]
By operating as described above, two input data can be recorded as separate files.
[0021]
(Embodiment 5)
Finally, an embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram of a reproducing method for simultaneously and concurrently reproducing a plurality of files having real-time properties recorded in claims 1 to 5. In FIG. 6, reference numeral 600 denotes a general file system for recording data in a fragmented manner and managing the fragmented data as a continuous file. Reference numeral 601 denotes fragmentary data of a plurality of files to be read in parallel from file management information of the file system. Address reading means for reading the read address in units of error correction coding blocks; 602, an address buffer means for temporarily storing the read address information; and 603, the address information of the address buffer means for determining the magnitude of the address value. An address rearranging means for sorting and rearranging the data in accordance with the relationship; 604, data reading means for reading out data fragments in the order of the addresses rearranged by the address rearranging means; 605, data for temporarily storing the read data fragments Buffer means, 6 Reference numeral 6 denotes a file specifying unit that specifies which file is the data fragment read from the file management information of the file system, and 607 temporarily stores in the data buffer unit for each file specified by the file specifying unit. Data rearranging means 608 and 609 for rearranging the data fragments are real-time output data 1 and output data 2 which are finally read in parallel.
[0022]
In the fifth embodiment, a case where two real-time files are read in parallel will be described. When the positions to be read of the two files to be read are specified, the address reading means 601 reads a plurality of pieces of address information on the medium on which the fragment data of the two files are recorded, and stores them in the address buffer means 602. The address rearranging unit 603 rearranges the plurality of addresses read by the address buffer unit 602 in ascending order of address. This arranges the data reading order so that the seek of the head is reduced as much as possible. When two files to be read are recorded according to claims 1 to 5, and the read start positions are the same in the two files, the read addresses are rearranged in ascending order to enable continuous read without any seek at all. Become. Based on the result of the address rearranging means 603, the data reading means 604 reads data at high speed with a minimum head seek and temporarily stores the data in the data buffer means 605. At this stage, the data of the two files is mixed and cannot be output as it is. The file specifying means 606 specifies which file is the data fragment read from the management information of the file system, and the data rearranging means 607 instructs the data buffer means 605 based on the result of the file specifying means 606. Classify the stored data into data of each file. By operating as described above, finally, real-time output data 1 and output data 2 can be obtained.
[0023]
In the fifth embodiment, an example in which two files are read has been described. However, even when there are two or more files, the files can be similarly reproduced.
[0024]
【The invention's effect】
As described above, according to the present invention, unnecessary head seeking when simultaneously recording / reproducing a plurality of real-time data as separate files is prevented, and recording / reproduction is performed without data loss. It becomes possible to do.
[Brief description of the drawings]
FIG. 1 is a block diagram of a real-time data recording method according to a first embodiment of the present invention; FIG. 2 is a schematic diagram showing a state of free space securing means and recording data according to a first embodiment of the present invention; FIG. 4 is a schematic diagram showing a state of free space securing means and recording data according to a second embodiment of the present invention; FIG. 4 is a schematic diagram showing opening of an unrecorded region according to a third embodiment of the present invention; FIG. 6 is a block diagram of a multiplexing order storage unit using an ID according to the fourth embodiment. FIG. 6 is a block diagram of a method of reproducing a real-time data file according to a fifth embodiment of the present invention.
100 file system 101 free space securing means 102 real time input data 1
103 Real-time input data 2
104 data division means 1
105 Data dividing means 2
106 multiplexing means 107 multiplexing order storage means 108 recording means 109 file management information updating means 201 capacity of real time input data 1 capacity 202 capacity of real time input data 2 203 capacity secured by free area securing means 204 of recorded data State 301 Real-time input data 1
302 Real-time input data 2
303 Capacity secured by free space securing means 304 State of recorded data 401 State of recorded data 402 State where unrecorded area is released 501 Input data 1 of real time divided
502 Divided real-time input data 2
503 multiplexing means 504 multiplexing order storing means 505 for storing multiplexing order by ID file management information updating means 600 for updating file management information by ID file system 601 address reading means 602 address buffer means 603 address rearranging means 604 Data reading means 605 Data buffer means 606 File specifying means 607 Data rearranging means 608 Real time output data 1
609 Real-time output data 2

Claims (6)

In a method of recording a plurality of real-time data in a separate file in parallel by using a file system, a free area securing means for securing a free recording area in a continuous area with respect to the file system; A data dividing unit that divides real-time data into pieces in units of error correction coding blocks of a medium that individually records the data, and a data rate according to a data rate at which the data fragments divided by the data dividing unit are individually recorded. Multiplexing means for performing time-division multiplexing at a ratio to form one-dimensional data; multiplexing order storage means for storing which kind of data is multiplexed in which order in the multiplexing means; Recording means for recording data in a continuous address area of a recording medium previously secured by the free area securing means; A multi-file real-time recording method, comprising: file management information updating means for updating the file system management information in accordance with the information of the multiplexing order storage means and dividing it into a plurality of files after recording of one piece is completed. . 2. The multi-file real-time recording method according to claim 1, wherein said empty area securing means secures a total capacity of a plurality of data in a continuous address area of a recording medium. The free space securing means always reserves a free area of a predetermined capacity in a continuous address area of the recording medium, and each time the reserved area becomes insufficient in accordance with the progress of the recording operation, the file management information updating means updates the free space by that time. 2. The multi-file real-time recording method according to claim 1, further comprising: updating the information of the file whose recording has been completed, and repeating the operation of securing the free space of the predetermined capacity in the continuous address area of the recording medium. . 4. The multi-recording apparatus according to claim 3, wherein at the end of the recording operation, the unrecorded area is released when the recording is completed before all the continuous address areas of the recording medium secured by the empty area securing means are used up. How to record files in real time. The multiplexing order storage means assigns a unique ID to a plurality of data recorded at the same time, and stores the multiplexing order of the data in the form of an ID in order from the top in the form of a table. 2. The multi-file real-time recording method according to claim 1, further comprising: reading a table of IDs stored by the multiplexing order storage means, collecting data having the same ID, and generating separate files. 6. A method for reading and reproducing a plurality of files recorded by the multi-file real-time recording method according to claim 1 to 5 in real time, wherein data of a plurality of files to be read in parallel is recorded from file management information of a file system. Address reading means for reading the set address in units of error correction coding blocks, address buffer means for temporarily storing the read address information, and address information of the address buffer means based on the magnitude relationship between the address values. Address rearranging means for sorting and rearranging, data reading means for reading data fragments in the order of the addresses rearranged by the address rearranging means, data buffer means for temporarily storing the read data fragments, File system file management information A file specifying unit for specifying which file each of the data fragments read from the file belongs to, and a data fragment temporarily stored in the data buffer unit for each file specified by the file specifying unit; A real-time reproduction method of a multi-file, comprising a data rearranging means.

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