JP4235658B2 - Information processing method and information processing apparatus - Google Patents

Description

  The present invention relates to an information processing technique for recording and reproducing moving image data and the like on a disk-shaped recording medium.

  In recent years, a camera-integrated recording / reproducing apparatus (hereinafter referred to as “video camera”) adopting a disk-shaped recording medium such as a DVD (hereinafter referred to as “disc”) as a recording medium for recording various data has appeared. ing. In such a video camera, data input / output characterized by random accessibility to a recording medium that was not found on a magnetic tape is performed.

  For example, in the video camera, a moving image, a still image, or a sound relating to a photographed scene can be recorded as a file in an arbitrary place on the disc. The video camera can perform easy and high-speed playback processing of recorded data by directly accessing each file during playback (see, for example, Patent Document 1).

  In general, when a file such as a moving image or audio is recorded on a disc, the data is divided into a plurality of pieces of continuously recorded data and recorded in a remote area on the disc. Hereinafter, an area on the disc in which a lump of data recorded in a continuous area forming a part of the file is referred to as an “Extent”.

  When playing back moving images and audio recorded on a plurality of extents, a time (seek time) for the head for playing back data to move between extents occurs. For this reason, when the extent size is small, supply of data to be reproduced cannot catch up and continuous reproduction may not be possible. Therefore, for example, in a DVD that is a kind of disc adopted in the video camera, the minimum recording unit that satisfies the length necessary to enable continuous playback processing of moving image data and audio data is defined as a standard. Yes. In general, the minimum recording unit for guaranteeing such continuous reproduction is called CDA (Continuous Data Area).

JP 2002-314916 A

  However, if the continuous free space is interrupted when recording a video on the disc and the extent after seek is less than the minimum recording unit, continuous playback may be possible if it is continuously played back with other videos due to the presence of that portion. There was a problem that it was impossible.

  The present invention has been made in view of such circumstances, and can make all extent sizes of data divided and recorded on a disc equal to or larger than the minimum recording unit, and can continuously reproduce the divided and recorded data. An object is to provide an information processing method and an information processing apparatus that can be guaranteed.

In order to achieve the above object, the method according to the present invention comprises:
An information processing method for reading and reproducing a plurality of pieces of data divided and recorded on a disk-shaped recording medium,
A control step of controlling the reproduction order of the plurality of data based on a minimum recording unit determined by the recording medium;
The control step includes
A first step of reading the first data from the first recording area;
After reading data from the first recording area to the discontinuous part on the condition that there is a discontinuous part of the first data before reading data less than a predetermined multiple of the minimum recording unit, A second step of seeking to the second recording area;
A third step of reading second data from the second recording area;
And a fourth step of seeking from the second recording area to the recording area where the data ahead of the discontinuous portion of the first data is recorded after the second data is read.
The apparatus according to the present invention is
An information processing apparatus that reads and reproduces a plurality of data divided and recorded on a disk-shaped recording medium,
Control means for controlling the reproduction order of the plurality of data based on a minimum recording unit defined in the recording medium;
The control means includes
The first data is read to the discontinuous portion on the condition that the discontinuous portion of the first data exists from the first recording area until the first data less than a predetermined multiple of the minimum recording unit is read. After that, seek to the second recording area, read the second data from the second recording area, and after the second data is read, the tip of the discontinuous portion of the first data from the second recording area Control is performed so as to seek to the recording area where the data is recorded.

  According to the present invention, it is possible to make all extent sizes of data divided and recorded on the disc equal to or larger than the minimum recording unit, and to guarantee continuous reproduction of the divided and recorded data.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the constituent elements described in this embodiment are merely examples, and are not intended to limit the scope of the present invention only to them.

<First Embodiment>
[Configuration of information processing device]
FIG. 1 is a schematic diagram showing a configuration of an information processing apparatus according to the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an application program that instructs the file system driver 2 to record / reproduce or edit a file on the disk 5. The file system driver 2 checks the free area on the disk 5 and the recording position of the file, and gives the disk controller 3 an instruction to read / write data from / to the disk 5. At this time, the application program 1 does not need to care about the position of the data on the disk 5, and the file system driver 2 searches for and records the free space on the disk 5, or searches for the position of the data on the disk 5. And read out.

  The disk controller 3 actually writes data on the disk 5 and reads data recorded from the disk 5. Data is read from and written to the disk 5 by the recording / reproducing head 4. The disk controller 3 is equipped with a buffer RAM 8 used for temporarily storing data when reading / writing data from / to the disk 5.

  Reference numeral 6 denotes actual data already written on the disk 5 (already written data). Reference numeral 7 denotes actual data newly written (currently) on the disk 5 (newly written data). In this embodiment, one file is divided and each partial data is recorded in a different area on the disk 5 and there are a plurality of recording areas. In some cases, it is recorded in one recording area.

[CDA when playing a movie alone]
FIG. 2 is a diagram for explaining the relationship between recorded data and playback time when a single moving image is played back by the information processing apparatus according to the first embodiment. In FIG. 2, the thick line indicates the time for the recording / reproducing head 4 to move in the area (extent) where data is recorded on the disk 5, and the broken line indicates the time for the recording / reproducing head 4 to seek (seek time). . In FIG. 2, the thin line represents the time for reproducing the data read by the recording / reproducing head 4.

  As shown in FIG. 2, the data is usually divided into a plurality of partial data, and is divided and recorded in respective recording areas on the disk 5 called extents. At this time, when data is continuously reproduced across extents, the recording / reproducing head 4 seeks between the extents. For this reason, if the combined time of the read time of data recorded in a certain extent and the seek time until the next extent is shorter than the data reproduction time in the extent, the data cannot be reproduced continuously. Therefore, as described above, it is common to record data in an empty area that is equal to or larger than the minimum recording area (CDA) where data can be continuously reproduced without interruption.

  Hereinafter, a method for obtaining the CDA at the time of reproducing the moving image alone will be described with reference to FIG. A thick line portion in FIG. 2 indicates a time for reading data included in one extent, and includes moving image data for a reproduction time Tv (seconds). The moving image data of the reproduction time Tv has a size of Sv × Tv (bit) when the moving image reproduction rate is Sv (bps). In addition, since there may be a defective block in the extent, if the defective block size is Dv (bit), the extent size is Sv × Tv + Dv (bit).

  That is, when the transfer rate for reading data from the disk is St (bps), the time for reading the data in the extent from the disk is represented by (Sv × Tv + Dv) / St (seconds). Also, assuming that the time (seek time) until the recording / reproducing head 4 arrives at the next extent is Tj (seconds), in order to continuously play a video without interruption, the playback time Tv of the video contained in one extent During (seconds), data reading and head seeking must be completed. That is, the following equation should be satisfied.

上式より、

From the above formula,

となり、ＣＤＡは、

CDA is

となる。

It becomes.

  Here, Tv is the minimum recording time (seconds) of a moving image for which continuous playback is guaranteed, and Lv is the minimum recording size (bits) of a moving image for which continuous playback is guaranteed. In the above description, the unit of time is “second” and the unit of size is “bit”, but other units may be used.

  FIG. 3 is a diagram showing an example of CDA calculation at the time of reproducing a moving image alone. First, assuming that the seek time Tj is 1.0 (second), the transfer rate St is 24 M (bps), the video playback rate Sv is 12 M (bps), and the bad block size Dv is 0 bits.

となり、不良ブロックがない場合は最低３．０Ｍ（Ｂ）のエクステントサイズで記録すればよいことがわかる。次に、条件を変えて計算してみると、動画再生レートSvが６Ｍ（ｂｐｓ）の場合は、

Thus, it can be seen that if there is no defective block, it is sufficient to record with an extent size of at least 3.0M (B). Next, when calculating with different conditions, if the video playback rate Sv is 6M (bps),

となり、動画再生レートが１／２になると、最小記録時間が約２／３に、最小記録サイズが約１／３になることがわかる。尚、この変化量は、転送レートStや動画再生レートSvにより異なってくる。さらに、不良ブロックサイズDvが３００Ｋ（Ｂ）、すなわち不良ブロック率が最小記録サイズの約１割とした場合は、

Thus, it can be seen that when the moving image playback rate is halved, the minimum recording time is about 2/3 and the minimum recording size is about 1/3. Note that the amount of change varies depending on the transfer rate St and the moving image playback rate Sv. Furthermore, when the defective block size Dv is 300K (B), that is, when the defective block rate is about 10% of the minimum recording size,

となり、不良ブロック率が１割増加すると、最小記録時間が約１割、最小記録サイズが約２割増加することがわかる。

Thus, it can be seen that when the defective block rate increases by 10%, the minimum recording time increases by about 10% and the minimum recording size increases by about 20%.

[Actual data recording size]
In an actual apparatus, the maximum seek time Tj and the transfer rate St are constant. Therefore, when data is actually recorded, the CDA size is determined by the reproduction rate and defective block size of moving image data and audio data. Normally, considering the worst case, the CDA size is determined in advance regardless of the playback rate and the bad block size. Note that the audio playback rate is usually constant, and even if it changes, it is sufficiently smaller than the playback rate of the moving image, so the influence on the CDA change may be ignored.

  FIG. 4 is a diagram for explaining a procedure for recording moving image data on a disc using the information processing apparatus according to the first embodiment of the present invention. FIG. 5 is a flowchart for explaining the moving image data recording procedure on the disc by the information processing apparatus according to the first embodiment.

  First, data is written to the extent 11 on the disk 5 via the buffer RAM 8 (step S51). When data is written to the extent 11 (part indicated by reference numeral 12) via the buffer RAM 8 as it is, the file system driver 2 reaches the extent 16 where the already written data exists (Yes in step S52). ) Seek to another extent 13 on the disk 5 and write the remaining data (step S53). It is assumed that the remaining part written in the extent 13 is completed in less than the minimum recording time. As described above, if there is an extent less than the minimum recording unit, it becomes an obstacle to continuous reproduction of the data.

  Therefore, when the application program 1 obtains information that has been written in less than the minimum recording unit after seek from the file system driver 2 after recording data on the disk 5 (in the case of Yes in step S54), the extent 13 after seek is obtained. And the data 12 of the extent 11 before seeking are combined to generate data for the minimum recording unit, and the data is copied to another area on the disk 5 (step S55). Then, the copy source portion (extent 12 and extent 13) is released so that it can be used for the next writing (step S56).

  In the embodiment described above, the area before and after the seek of the disk 5 has been read and copied again. However, in general, the data immediately after writing remains in the buffer RAM 8 in the disk controller 3 in general. In this case, if the contents of the corresponding buffer RAM 8 are written to the disk 5 again, it is not necessary to seek and read them. In addition, extents in which partial data other than the final portion are recorded are usually recorded in the minimum recording unit or more, but in the unlikely event that there is a recording area less than the minimum recording unit in the extent other than the final portion. However, by performing the same procedure as described above, it is possible to make all the recording areas equal to or larger than the minimum recording unit.

[Application example]
FIG. 6 is a diagram for explaining another procedure for recording moving image data on a disc using the information processing apparatus according to the first embodiment of the present invention. FIG. 7 is a flowchart for explaining another moving image data recording procedure on the disc by the information processing apparatus according to the first embodiment.

  First, data is written to the extent 21 on the disk 5 via the buffer RAM 8 (step S71). Subsequently, when data is written to the extent 21 (the portion indicated by the data 22) via the buffer RAM 8, the file system driver 2 writes the data to the extent 26, which is the recording area of the already written data. Since it is approaching (Yes in step S72), seek to another extent 23 and write the remaining data (step S73). It is assumed that the remaining portion written in the extent 23 is completed in less than the minimum recording time.

  When the application program 1 obtains information indicating that the extent 23 written after seeking is completed from the file system driver 2 after recording data on the disk 5 (in the case of Yes in step S64), after seeking. Data (data consisting of data 24 and data 25) is generated by combining the data of the extent 23 and the data 22 of the extent 21 corresponding to the minimum recording unit before seeking, and the data is stored in another area on the disk 5. Copy (step S75). Then, the copy source part (extent 22 and extent 23) is released so that it can be used for the next writing (step S76).

  As described above, in this embodiment, when data such as a moving image to be recorded on the disk 5 is recorded in an extent that is less than the minimum recording unit, all extents are automatically set to the minimum recording unit or more. By copying the data once recorded, an effect of guaranteeing continuous reproduction of the data recorded on the disk 5 can be obtained. Further, by deleting the original data after copying, another data can be recorded in the released part. Furthermore, as shown in the application example, by setting the portion released after copying to the minimum recording unit or more, it is possible to record other data in the released portion with the minimum recording unit or more, and the disk usage efficiency The effect that it can improve further is acquired.

<Second Embodiment>
In the first embodiment, the continuous free area is interrupted when moving images are recorded on the disc, and when the recording after seek is completed and the writing is finished with less than the minimum recording unit, continuous reproduction with other moving images becomes impossible. Solved the problem. Next, in the second embodiment, when writing is finished with the size of the continuous free area immediately after the end of moving image recording on the disc being less than the minimum recording unit, the other moving image is recorded as an area. An information processing method and an information processing apparatus for solving the problem of being unusable will be described.

  Note that the configuration of the information processing apparatus used in the second embodiment, the CDA and the actual data recording size at the time of independent playback of the moving image are the same as those of the information processing apparatus according to the first embodiment, and therefore detailed description thereof Is omitted.

  FIG. 8 is a diagram for explaining a procedure for recording moving image data using the information processing apparatus according to the second embodiment of the present invention. FIG. 9 is a flowchart for explaining the moving image data recording procedure on the disc by the information processing apparatus according to the second embodiment.

  First, data is written to the extent 31 on the disk 5 via the buffer RAM 8 (step S91). Subsequently, data is written to the extent 31 (data 32 portion) via the buffer RAM 8, and it is determined whether or not the writing is completed (step S92). Then, the file system driver 2 determines whether or not the partial Tr up to the extent 34 that is the recording area of the next written data is less than the minimum recording unit (step S93). As a result, if Tr is less than the minimum recording unit (Yes), the data 32 for the minimum recording time is traced back to the other area (extent 33) from the end of the data (step S84).

  Then, the data 32 that is the copy source portion is released so that it can be used for the next writing (step S85). By doing so, the free space that has been released also exceeds the minimum recording unit, data recorded in this free space can be reproduced properly, and no waste space is created on the disc. Is possible.

  In the above embodiment, the image data for the minimum recording time is read and copied again. However, in reality, the disk controller 3 has the buffer RAM 8 and the data immediately after the writing is generally left. is there. In this case, if the contents of the buffer RAM 8 are written as they are, it is not necessary to seek and read again.

  As described above, in the present embodiment, when the continuous free space following the extent in which data such as moving images to be recorded on the disk is recorded is less than the minimum recording unit, the data is automatically set to the minimum recording unit or more. By performing the copying, it is possible to assure the effect that continuous reproduction of moving images can be ensured even when other data is recorded in the empty area.

<Third Embodiment>
In the present embodiment, an information processing method and an information processing apparatus for reducing the number of seeks during post-recording playback will be described.

[CDA for general post-recording playback]
First, a general CDA at the time of post-recording playback will be described. In the post-recording, the moving image data and the audio data are recorded on the disc as separate files, and the audio included in the moving image is replaced with the after-recording audio while reading both files simultaneously. The same applies to not only after-recording but also synthesizing and outputting the audio channel included in the moving image data and the audio channel of another file.

  FIG. 10 is a diagram for explaining the relationship between recorded data and playback time during post-recording playback by a general information processing apparatus. In FIG. 10, a thick line indicates a time for moving the moving image reproducing head in an area (extent) where data is recorded, and a broken line indicates a time for the moving image reproducing head to seek. The thin line is the time for actually reading the read data. As shown in FIG. 9, both the moving image data and the audio data are divided into extents and recorded separately on the disc.

Here, when continuous reproduction is performed across extents, a head seek occurs between extents (seek 3). In the case of post-recording, a seek for reading audio data occurs during the reading of moving image data (seeks 1 and 2).
Therefore, the reading time of data recorded in the extent of video data and audio data existing from one extent of video to the next extent (the range surrounded by the dotted line in the figure) and the next data If the time combined with the seek time is longer than the data playback time in the extent, post-recording cannot be played back continuously. Therefore, it is necessary to determine a CDA (minimum recording area) even during post-recording.

  Hereinafter, a method for obtaining CDA during post-recording reproduction will be described with reference to FIG. As described above, the thick line portion in FIG. 10 indicates the time for reading the data included in one extent for both the moving image and the sound. The moving image data for the reproduction time Tv (second) and the reproduction time Ta (second) are shown. Audio data is included. As with video playback alone, the video playback rate is Sv (bps), the audio playback rate is Sa (bps), the bad block size in the video extent is Dv (bits), and the bad block size in the audio extent is Da (bits). ) If the transfer rate from the disk is St (bps), the time to read the data in the movie extent from the disk is (Sv x Tv + Dv) / St (seconds)

  Thus, the time for reading the data in the audio extent from the disk is (Sa × Ta + Da) / St (seconds). If the time (seek time) for the head to move between extents is Tj (seconds), in order to perform post-recording playback continuously without interruption, the playback time Tv, Ta (seconds) of the video and audio contained in one extent During this time, data reading and head seeking must be completed, and eventually the following equation should be satisfied.

上式より、

From the above formula,

となり（TvとTaの最小値は同じ）、ＣＤＡは、

(Minimum value of Tv and Ta is the same), CDA is

となる。

It becomes.

  Here, Tv and Ta are the minimum recording times (seconds) of moving image data and audio data for which continuous reproduction is guaranteed. Lv and La are minimum recording sizes (bits) of moving image data and audio data for which continuous reproduction is guaranteed. As is clear from the above equation, the minimum values of Tv and Ta are the same. Also in this embodiment, in the above description, the unit of time is “second” and the unit of size is “bit”, but the present invention is not limited to this.

  However, in the above-described general CDA during post-recording playback, the minimum recording unit is determined assuming that the number of streams is one, and a plurality of streams such as images and audio are switched later by post-recording processing or the like. When the reproduction is changed so that the number of seeks is increased, the effective data amount included in the minimum recording unit is reduced in the initial minimum recording unit, which causes a problem that continuous reproduction cannot be performed. Also, if the minimum recording unit is determined assuming that playback is performed while switching between a plurality of streams in advance, there arises a problem that a recording unit larger than necessary is required.

  Furthermore, as described above, the minimum video recording time Tv, the minimum audio recording time Ta, the minimum video recording size Lv, and the minimum audio recording size La when performing post-recording playback using video data and audio data are three seeks. It can be seen that time Tj has an effect. Therefore, in the third embodiment, an information processing apparatus provided with a mechanism for reducing the number of seeks as described below will be described.

[Configuration of information processing device]
FIG. 11 is a schematic diagram showing the configuration of an information recording / reproducing apparatus according to the third embodiment of the present invention. In FIG. 1, reference numeral 111 denotes an application program that instructs the file system driver 112 to record / reproduce or edit a file on the disk 115. The file system driver 112 checks the free area on the disk 115 and the file recording position, and gives the disk controller 113 an instruction to read / write data from / to the disk 115. At this time, the application program 111 does not need to care about the position of the data on the disk 115, and the file system driver 112 searches and records a free area on the disk 115 or searches for the position of the data on the disk. Read out.

  The disk controller 113 actually writes data on the disk 115 and reads data from the disk. The disk controller 113 is equipped with a buffer RAM that is used to temporarily store data when reading / writing data from / to the disk 115.

  Reference numeral 116 denotes a recording area for data such as actual moving image data and audio data already written on the disk 115. Data is read from and written to the disk 115 by the recording / reproducing head 114. In the present embodiment, a single file may be recorded in a continuous area, or may be a plurality of data recorded separately in different areas.

  In FIG. 11, when the application program 111 instructs the file system driver 112 to start playback, the file system driver 112 gives a playback instruction to the disk controller 113. At this point, the file system driver 112 detects whether there is a discontinuous portion that requires seeking within twice the minimum moving image recording size. Normally, like the general CDA shown in FIG. 10, after reading out the minimum moving image recording size Lv, seeking is performed to read out the minimum audio recording size La. After the reading, the audio data is read, and then seek is directly performed to the moving image data ahead of the discontinuous portion of the moving image data.

[CDA during post-recording playback]
FIG. 12 is a diagram for explaining the relationship between recording data and playback time during post-recording playback by the information processing apparatus according to the third embodiment. The thick line portion in FIG. 12 indicates the time for reading the data included in one extent for both the moving image and the sound. The moving image data for the reproduction time Tv (second) and the audio data for the reproduction time Ta (second) are included. include. Video playback rate is Sv (bps), audio playback rate is Sa (bps), bad block size in video extent is Dv (bit), bad block size in audio extent is Da (bit), transfer rate from disk Assuming St (bps), the time to read the data in the video extent from the disk is (Sv × Tv + Dv) / St (seconds), and the time to read the data in the audio extent from the disk is (Sa × Ta + Da) / St (seconds) )

  Also, assuming that the time (seek time) for the head to move between extents is Tj (seconds), in order to perform post-recording playback continuously without interruption, the playback time Tv of the video and audio included in each extent, During Ta (seconds), data read and head seek must be completed twice. That is, the following mathematical formula should be satisfied.

上式より、

From the above formula,

となり（TvとTaの最小値は同じ）、ＣＤＡは、

(Minimum value of Tv and Ta is the same), CDA is

となる。

It becomes.

  Here, Tv and Ta are the minimum recording times (seconds) of moving image data and audio data for which continuous reproduction is guaranteed. Lv and La are minimum recording sizes (bits) of moving image data and audio data for which continuous reproduction is guaranteed. As is clear from the above equation, the minimum values of Tv and Ta are the same. Here, when the equation (9) relating to the general CDA described above and the equation (12) relating to the CDA in the present embodiment are compared, the influence of the seek time is equivalent to the decrease in the number of seeks from three to two. It can be seen that it has decreased by 2/3 times. In the above description, the unit of time is “seconds” and the unit of size is “bits”, but the present invention is not limited to this.

[Actual data recording size]
In an actual apparatus, the maximum seek time Tj and the transfer rate St are constant. Therefore, when data is actually recorded, the CDA size is determined by the reproduction rate and defective block size of moving image data and audio data.

  FIG. 13 is a diagram showing an example of CDA calculation at the time of general post-recording reproduction. FIG. 14 is a diagram showing an example of CDA calculation during post-recording playback according to the present embodiment. As can be seen from FIGS. 13 and 14, the CDA calculation example at the time of post-recording playback according to the present embodiment has a smaller value than the CDA calculation example at the time of general post-recording playback. Note that the audio playback rate is usually constant, and even if it changes, it is sufficiently smaller than the playback rate of the moving image, so the influence on the CDA change may be ignored.

  As described above, in this embodiment, when a stream of moving image data and audio data recorded on a disc is read, a stream that requires a seek until data less than twice the minimum recording unit is read. When there are discontinuous points, the amount read into the buffer RAM is increased up to less than twice the minimum recording unit. Also, seek is not performed between discontinuous parts in the same stream, but in the discontinuous part, a different stream is always read and another stream is read, and then seek is performed to the original stream. It is possible to reduce the enlargement of the minimum recording unit to cope with the above.

<Other embodiments>
Note that the present invention can be applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), but a device (for example, a copier, a facsimile machine, etc.) composed of a single device You may apply to.

  Another object of the present invention is to supply a recording medium (or storage medium) on which a program code of software that realizes the functions of the above-described embodiments is recorded to a system or apparatus, and to perform computer (or CPU or CPU) of the system or apparatus. Needless to say, this can also be achieved when the MPU) reads and executes the program code stored in the recording medium. In this case, the program code itself read from the recording medium realizes the functions of the above-described embodiment, and the recording medium on which the program code is recorded constitutes the present invention. Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an operating system (OS) or the like running on the computer based on an instruction of the program code. It goes without saying that a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.

  Further, after the program code read from the recording medium is written into a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. It goes without saying that the case where the CPU or the like provided in the card or the function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.

  When the present invention is applied to the recording medium, program code corresponding to the flowchart described above is stored in the recording medium.

It is the schematic which shows the structure of the information processing apparatus which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the relationship between the recording data at the time of the moving image independent reproduction | regeneration by the information processing apparatus which concerns on 1st Embodiment, and reproduction | regeneration time. It is a figure which shows the CDA calculation example at the time of a moving image independent reproduction | regeneration. It is a figure for demonstrating the procedure which records moving image data on a disk using the information processing apparatus by the 1st Embodiment of this invention. It is a flowchart for demonstrating the moving image data recording procedure to the disc by the information processing apparatus which concerns on 1st Embodiment. It is a figure for demonstrating another procedure which records moving image data on a disk using the information processing apparatus by the 1st Embodiment of this invention. It is a flowchart for demonstrating another moving image data recording procedure to the disc by the information processing apparatus which concerns on 1st Embodiment. It is a figure for demonstrating the procedure which records moving image data using the information processing apparatus by the 2nd Embodiment of this invention. It is a flowchart for demonstrating the moving image data recording procedure to the disc by the information processing apparatus which concerns on 2nd Embodiment. It is a figure for demonstrating the relationship between the recording data at the time of dubbing reproduction | regeneration by a general information processing apparatus, and reproduction | regeneration time. It is the schematic which shows the structure of the information processing apparatus which concerns on the 3rd Embodiment of this invention. It is a figure for demonstrating the relationship between the recording data at the time of the dubbing reproduction | regeneration by the information processing apparatus which concerns on 3rd Embodiment, and reproduction | regeneration time. It is a figure which shows the example of CDA calculation at the time of general dubbing reproduction | regeneration. It is a figure which shows the CDA calculation example at the time of the after-recording reproduction | regeneration which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,111 Application program 2,112 File system driver 3,113 Disk controller 4,114 Recording / reproducing head 5,115 Disk 6 Existing write data 7 New write data 8 Buffer RAM
116 Data recording area

Claims (6)

An information processing method for reading and reproducing a plurality of pieces of data divided and recorded on a disk-shaped recording medium,
A control step of controlling the reproduction order of the plurality of data based on a minimum recording unit determined by the recording medium;
The control step includes
A first step of reading the first data from the first recording area;
After reading data from the first recording area to the discontinuous part on the condition that there is a discontinuous part of the first data before reading data less than a predetermined multiple of the minimum recording unit, A second step of seeking to the second recording area;
A third step of reading second data from the second recording area;
And a fourth step of seeking from the second recording area to the recording area where the data before the discontinuous portion of the first data is recorded after the second data is read. Processing method.   When moving image data and audio data are read from the recording medium as the plurality of data and after-recording reproduction is performed, there is a discontinuous portion of the moving image data until moving image data less than a predetermined multiple of the minimum recording unit is read. In this case, the moving image data is read out without seeking to the other recording area up to the discontinuous portion, and then the audio data is read out by seeking into the storage region of the audio data, and then seek is performed to the moving image data ahead of the discontinuous portion. The information processing method according to claim 1. When the moving image data and the audio data recorded on the recording medium are read, there is a discontinuous portion that requires a seek before reading moving image data less than a predetermined multiple of the minimum recording unit. 3. The information processing method according to claim 2, wherein an amount of data read into the buffer memory is increased to less than the predetermined multiple of the minimum recording unit. The minimum recording unit is defined by the minimum video recording time Tv, the minimum audio recording time Ta, the minimum video recording size Lv, and the minimum audio recording size La during post-recording playback using the video data and the audio data,
The minimum video recording time Tv, minimum audio recording time Ta, minimum video recording size Lv, and minimum audio recording size La are the head seek time Tj, the transfer rate for reading data from a disk-shaped recording medium, St, If the playback rate is Sv, the audio playback rate is Sa, the bad block size included in the minimum video recording unit is Dv, and the bad block size included in the minimum audio recording unit is Da,
Tv = (2 × Tj + Dv / St + Da / St) / (1−Sv / St−Sa / St),
Ta = (2 × Tj + Da / St + Dv / St) / (1−Sv / St−Sa / St),
Lv = Sv × Tv + Dv,
The information processing method according to claim 2, wherein La = Sa × Ta + Da.   5. The information processing method according to claim 1, wherein the recording medium is an optical disk capable of rewriting data. An information processing apparatus that reads and reproduces a plurality of data divided and recorded on a disk-shaped recording medium,
Control means for controlling the reproduction order of the plurality of data based on a minimum recording unit defined in the recording medium;
The control means includes
The first data is read to the discontinuous portion on the condition that the discontinuous portion of the first data exists from the first recording area until the first data less than a predetermined multiple of the minimum recording unit is read. After that, seek to the second recording area, read the second data from the second recording area, and after the second data is read, the tip of the discontinuous portion of the first data from the second recording area An information processing apparatus that performs control so as to seek to a recording area in which data is recorded.

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