JP2006164383A - Apparatus for recording and reproducing data on disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable continuous reproduction of picture data by reading data without causing jump at the middle of a region in which animation or voice data recorded alternately in a disk is recorded continuously. <P>SOLUTION: In a program for indicating to a recording and reproducing apparatus in order to reproduce animation and/or voice data recorded alternately, indication of reproduction of the data is performed for the recording and reproducing apparatus for each unit region for based on arrangement information of data recorded for each unit region. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for recording and reproducing data taken by a 3D camera or the like on a disk medium in a moving image or audio data recording and reproducing apparatus such as a disc camcorder.

  Since data taken by a 3D camera or the like creates two moving images on the left and right, when recorded on a disk medium, it is recorded alternately in an arrangement as shown in FIG. 1 so as not to cause a seek operation as much as possible. That is, data A is a moving image shot by the right camera, and data B is a moving image shot by the left camera. When the two data are alternately recorded while being stored in the buffer memory at the time of shooting, the seek operation occurring during the recording can be minimized.

During playback, 3D display is performed while playing back two data alternately, but the application that issues the playback command does not know the data arrangement on the disk, so issue the playback command at the appropriate size from the beginning of the file. It will be. As shown in Fig. 1, when data A consists of three 10MB extents (continuous recording area) and data B consists of three 10MB extents, the conventional playback command is related to the extent size as shown in Fig. 6. Instead, playback was performed in a predetermined size (for example, 8 MB). That is, the data A is 30 MB of data that is reproduced 3 times every 8 MB, the last is 6 MB, and the data B is 30 MB of data that is reproduced 3 times every 8 MB, and the last is 6 MB.
Japanese Patent Laid-Open No. 2003-059196

  However, in the conventional reproducing method, the jump of the reproducing head occurs 11 times as shown in FIG. That is, jump to data B while reading the extent of data A, and jump to data A while reading the extent of data B. Furthermore, the jump is made to the beginning of the next extent at the end of the extent of data A or data B. The numbers in FIG. 7 indicate the jump order, but it can be seen that 11 jumps occur in total.

  In this case, time is taken for jumping, and there is a possibility that image data cannot be continuously reproduced.

  Therefore, an object of the present invention is to enable continuous reproduction of image data by reading data without causing a jump in the middle of a continuous recording area.

The object is achieved by the following invention. In a computer system configured to be connectable to a disk drive device capable of driving a recording medium in which different information is alternately recorded for each predetermined size, and capable of reproducing the information recorded on the recording medium,
When reading and reproducing the different information from the storage medium, a CPU that executes an operating system and an application program on the memory, and arrangement information and extent size of each area recorded alternately on the recording medium A computer system comprising: means for acquiring the information from a disk drive device; and means for alternately reading different information from the recording medium using the acquired extent size as a unit of reading.

  In the present invention, it is possible to continuously reproduce image data by reading data without causing a jump in the middle of the continuous recording area.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a schematic diagram of the configuration of the present invention. A CPU 11 controls the entire apparatus and includes an application program 1 and a file system driver 2. The application program 1 controls the input / output of the data 10 through the input / output device 3, instructs the codec 4 to encode and decode the data 10, stores the encoded data in the memory 5, and onto the disk medium The file system driver 2 is instructed to record / reproduce or edit the data. The file system driver 2 checks the free space on the disk and the recording position of the file, and gives the disk controller 6 an instruction to read / write data from / to the disk 8. At this time, the application program 1 does not need to care about the position of the data on the disk, the file system driver 2 searches for and records the free space on the disk, or searches and reads the position of the data on the disk. To do. The disk controller 6 actually writes and reads data on the disk 8. Reference numeral 9 denotes actual data written on the disk 8, which is read and written by the recording / reproducing head 7. In the present embodiment, one file may be recorded in a continuous area or a plurality of data recorded in different areas, and a lump of data recorded in a continuous area forming part of the file. Is called an extent.

  FIG. 1 shows the arrangement of data to be reproduced on the disk in this embodiment, where data A and data B are alternately recorded in units of 10 MB. Although the recording unit in this embodiment is 10 MB, this is an example, and the recording unit may not be 10 MB, and the size of each recording area may be variable. As shown in FIG. 1, the extents may be distributed on the disk. These two data are played back alternately, but the conventional method does not consider the continuous recording area on the disc, so the application program 1 plays back the file system 2 appropriately as shown in FIG. Specify the size (in this example, 8MB). As a result, a jump from the middle of the extent of data A to data B, a jump from the middle of the extent of data B to data A, and a jump from the end of each data extent to the beginning of the next extent occur, and continuous playback is possible. It may not be possible.

  FIG. 7 shows the actual movement of the head 7. First, the first extent of data A is read for 8 MB, then the first extent of data B is read by jumping to the beginning of data B (jump 1). Return to the middle of the first extent of data A (jump 2), read the remaining 2MB, jump to the next extent of data A (jump 3), and read 6MB of data. Next, return to the middle of the first extent of data B (jump 4), read the remaining 2MB, jump to the next extent of data B (jump 5), and read 6MB of data. Similarly, the remaining data is read out, but as shown in FIG. 7, the jump of the head 7 occurs a total of 11 times.

  Accordingly, an object of the present invention is to reduce the number of jumps and reliably perform continuous reproduction. Since the application program 1 issues a playback instruction including the size read from the disk, the application program 1 needs to know the data arrangement information on the disk. In this case, the application program 1 may instruct the file system 2 at the time of recording, and the information may be held in the management information file, or may be received from the file system at the time of reproduction.

  FIG. 3 shows a write command issued by the application program 1 to the file system 2. Data A and data B are alternately recorded, and this one write command is limited to be recorded in one continuous recording area (extent), and size information for each data is recorded in the management information. In this case, the application program 1 can obtain the extent size of each data from the management information at the time of reproduction, and issue a reproduction command so as not to cross the extent. At this time, if there is no restriction that a single write command is recorded in one continuous recording area (extent), the application program 1 does not know the size of each extent, so the extent size is obtained by other means. There is a need.

  4 and 5 show arrangement information of data A and data B in the file system 2, respectively. This consists of a set of a start address represented by a sector (2 KB unit) number and a size represented by a byte size, and one set represents one extent. For example, since the size of each extent is 10 MB, it corresponds to 5000 sectors, and the first extent of data A starts at sector address 50001 and ends at sector address 55000. The same applies to the other extents. The first two extents (total 4) of data A and data B are contiguous, and the last extent of data A and data B (2 total) are also contiguous. However, it can be seen that it is recorded at a position apart from the previous four extents. By passing the extent information to the application program 1, the application program 1 can issue a playback command so as not to cross the extent.

  FIG. 8 is a command for alternately reading two data from the disk in this embodiment. In this example, the application program 1 issues a playback command so as not to straddle the extents of data A and data B. As a result, the head position of the disk drive device moves as shown in FIG. 9, and the jump of the head 7 occurs only between the extents of data A and data B. Note that the first four extents of data A and data B and the last two extents are arranged consecutively on the disk, so the jump waits for rotation and a seek occurs during that time. That is, in FIG. 9, jump numbers 1, 2, 3, and 5 are waiting for rotation, and jump number 4 is accompanied by a seek.

  Here, the rotation wait occurs because the next extent read command is issued after waiting for each extent to be read. The application program 1 issues the read command continuously, and the disk controller 6 If you can process the read command continuously, there is no waiting for rotation. Therefore, FIG. 10 shows the movement of the head 7 when the application program 1 issues a read command and immediately issues a read command instead of a completion return. In this case, the head can read data continuously without jumping between extents recorded continuously on the disk. That is, a jump occurs only once between extents recorded at distant positions.

  Next, the arrangement of data read from the disk on the memory will be described. Normally, when one kind of data is read continuously, one data buffer area is prepared as shown in FIG. 11, and this area is used as a ring buffer. However, when two types of different data are read alternately as in the present embodiment, the process becomes easier if the buffer area on the memory is divided into two. FIG. 12 shows an example in which a buffer area is provided and recorded for each of data A and data B. In this way, when the encoded data on the memory is decoded, the data in the buffer can be decoded only by being transferred to the codec alternately.

  In general, the reading speed from the disk is higher than the speed at which data is transferred to the codec. Therefore, during reproduction, there is a waiting time for temporarily stopping data reading from the disk until the memory capacity becomes somewhat free. If this waiting time is set between the end of the extent of data A and data B and the start of the next extent, the reading efficiency is further improved. That is, as shown in FIG. 1, even when the extents of data A and data B are not continuous on the disk, the head can be jumped during the waiting time, and there is a possibility that continuous reproduction of data is interrupted. Less. FIG. 13 shows a graph of power consumption and memory usage during the time when the head reads data and the waiting time. As can be seen from the figure, the power consumption is large when reading data from the disk, and the power consumption is small when waiting. In addition, data is accumulated in the memory when data is read from the disk, and decreases when waiting. If the wait timing is set between the end of one extent and the beginning of the next extent as shown in this example, the waiting time for one session becomes longer, the possibility of interruption of continuous playback is reduced, and the power consumption is also minimized. It can be suppressed to the limit.

  In the present embodiment, two moving images are alternately recorded and reproduced. However, the present invention can be applied even when there are two sounds alternately or one moving image and one sound.

Data placement on disk. The structure schematic of a present Example. A command that writes two data to the disk alternately. Placement information in the file system of data A. Placement information in the file system of data B. A command that reads two data from a conventional disk alternately. Procedure to read two data from a conventional disk alternately. A command for alternately reading two data from the disk of this embodiment. Procedure 1 for alternately reading two data from the disk of this embodiment. Step 2 for alternately reading two data from the disk of this embodiment. Normal data placement on memory. Data arrangement on the memory of this embodiment. Intermittent operation and memory usage for each extent size.

Explanation of symbols

1 Application program
2 File system driver
3 Input / output devices
4 codec
5 memory
6 Disk controller
7 Recording / playback head
8 disk media
9 Recorded data
10 Input data
11 CPU

Claims (6)

  In a computer system configured to be connectable to a disk drive device capable of driving a recording medium in which different information is alternately recorded for each predetermined size and capable of reproducing information recorded on the recording medium, a memory, and In the case of reading out and reproducing the different information from the storage medium, the CPU for executing the operating system and application program on the memory, and the disk drive device shows the arrangement information and extent size of each area recorded alternately on the recording medium And a means for alternately reading different information from the recording medium using the acquired extent size as a unit of reading.   In an information recording apparatus for alternately recording a series of different information on a recording medium for each predetermined size on the basis of a command from an application program running on a higher-level computer system, the command from the application program An information recording apparatus comprising: means for alternately recording the different series of information on the recording medium while changing the size of the alternately recorded data. In an information reproducing apparatus for reproducing a series of different information alternately recorded for each predetermined size on a recording medium based on a command from an application program running on a higher-level computer system, Means for transferring the arrangement information and extent size of each area alternately recorded in the computer system,
An information reproducing apparatus comprising: means for alternately reading and reproducing the different series of information using the extent size as a reading unit based on a command from the application program.   Application configured to be connectable to a disk drive device capable of driving a recording medium in which different information is alternately recorded for each predetermined size, and operable on a computer system capable of reproducing the information recorded on the recording medium In the program, the step of acquiring from the disk drive device the arrangement information and extent size of each area recorded alternately on the recording medium, and alternately reading different information from the recording medium using the acquired extent size as a unit of reading. For issuing a reproduction command to the disk drive device. In claims 1 to 4,
The extent size is stored in the management information area on the recording medium or the arrangement information of the file system. In claims 1 to 4,
The information is video / audio information, and the extent size corresponds to a video / audio size for a certain time.

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