JP5491072B2 - Optical disc playback apparatus and optical disc playback method - Google Patents

Description

  The present invention relates to an optical disc playback apparatus and optical disc playback method for performing disc analysis of an optical disc.

  Conventionally, there is a technique for dividing and recording a file on an optical disc (see, for example, Patent Document 1). According to this kind of technology, even if the data size that can be recorded on the optical disc at a time by the optical disc recording device is smaller than the data size of one file to be recorded, it is easy to divide the file. Can be recorded on an optical disc.

  Recently, a UDF (Universal Disk Format) format has been used as a recording format for optical disks such as CDs and DVDs. The UDF recording format is one of optical disc formats formulated by OSTA (Optical Storage Technology Association), an industry association of optical recording media, and is a file format that does not depend on the operating system. UDF allows one file to be distributed and written on an optical disk.

  According to a technique for dividing and recording a file on this type of optical disc, the user can use the file without being aware of the division of the file.

JP 2006-246422 A

  When reproducing one file (hereinafter referred to as a divided file) written in a distributed manner on the optical disc, the optical disc playback apparatus needs to perform a file search process on the optical disc in parallel with the playback process. For this reason, if the number of divisions increases, the search processing may not catch up with the reproduction processing depending on the size of the data buffer, and sound skipping or sound interruption may occur.

  However, the conventional disk reproducing apparatus performs disk analysis so as to recognize a file having a large number of divisions that may cause a problem during reproduction when the optical disk is loaded. For this reason, as a result of disc analysis of the loaded optical disc, the optical disc playback apparatus presents a file having a large number of such divisions as one of the files existing on the optical disc to the user.

  The user is not conscious of whether or not the file desired to be reproduced is divided, the number of divisions, and the reproduction of the file while searching for the divided data. For this reason, when a problem such as skipping or interruption of sound occurs due to the large number of divisions, the user is not satisfied with the performance of the optical disc playback device without being able to come up with the cause of the problem. May end up.

  The present invention has been made in consideration of the above-described circumstances, and an optical disc reproduction that can extract a file that may cause a problem during reproduction out of files that are divided and recorded on the optical disc at the time of disc analysis. It is an object to provide an apparatus and an optical disc reproducing method.

In order to solve the above-described problem, an optical disc reproducing apparatus according to the present invention analyzes a hierarchical structure and contents of directories and files recorded on an optical disc from a signal read from the optical disc when the optical disc is loaded. A disk analysis unit, and an analysis result storage unit to which an analysis result of the optical disk including information of a file analyzed by the disk analysis unit is written. The disk analysis unit is divided into a plurality of file elements. The division state acquisition unit for acquiring the division state of the file configured by the above, and the logical address at which the file element at the end of the file of consecutive file elements is recorded, and the file element at the head of the file is recorded If the value is smaller than the logical address, there is a possibility that the division state may hinder reproduction. By determining that the that state, and the split state is determined file registration judging section that judges whether the absence may compromise reproduction, the divided state without may compromise reproduction state And an analysis result writing unit for registering information of the file in the analysis result storage unit. Further, in order to solve the above-described problem, the optical disk reproducing apparatus according to the present invention has a hierarchical structure and contents of directories and files recorded on the optical disk from a signal read from the optical disk when the optical disk is loaded. And an analysis result storage unit to which an analysis result of the optical disc including information on the file analyzed by the disc analysis unit is written, and the disc analysis unit is divided into a plurality of parts. A division state acquisition unit that acquires a division state of a file composed of file elements and a state in which the division state may interfere with reproduction if the file element has a size smaller than a predetermined size. determine whether the split state is the absence may compromise reproduction by determining the A file registration determination unit that performs, and an analysis result writing unit that registers information on the file in the analysis result storage unit when the division state does not cause a problem in reproduction. It is.

On the other hand, the optical disc reproducing method according to the present invention includes a step of loading an optical disc and a hierarchical structure and contents of directories and files recorded on the optical disc from a signal read from the optical disc in order to solve the above-described problem. And a step of registering an analysis result of the optical disc including information of the file analyzed in the step of analyzing a hierarchical structure and contents of directories and files recorded on the optical disc in an analysis result storage unit. a step of analyzing a hierarchical structure and contents of the directories and files recorded on the optical disk, acquiring a division state of being divided is composed of a plurality of files element files, the consecutive file elements The file element at the end of the file is recorded Logical address is, the head side of the file element of the file is smaller than the recorded logical address, by the split state is determined to be a condition in which there may compromise reproduction, the The step of determining whether or not the division state is a state that does not impede reproduction, and the information on the file that is in a state that the division state does not impair reproduction are stored in the analysis result storage unit. And storing the method. In addition, in order to solve the above-described problem, the optical disc reproducing method according to the present invention includes a step of loading an optical disc, and a hierarchical structure and contents of directories and files recorded on the optical disc from signals read from the optical disc. And a step of registering an analysis result of the optical disc including information of the file analyzed in the step of analyzing a hierarchical structure and contents of directories and files recorded on the optical disc in an analysis result storage unit. And analyzing the hierarchical structure and contents of directories and files recorded on the optical disc, obtaining a division state of a file divided into a plurality of file elements, and adding a predetermined value to the file elements. If there is something smaller than the size, Serial determining whether the split state is the absence may compromise regenerated by split state is determined to be a condition in which there may compromise reproduction, the divided state in the reproduction And storing the information of the file in the analysis result storage unit when there is no risk of hindrance.

  According to the optical disk reproducing apparatus and the optical disk reproducing method of the present invention, a file that is likely to cause a problem during reproduction can be extracted during disk analysis from among the files divided and recorded on the optical disk.

1 is a schematic block diagram showing an embodiment of an optical disc reproducing apparatus according to the present invention. Explanatory drawing which shows an example of a mode that the storage area of a file buffer is used effectively by excluding registration of the file which has difficulty in reproduction. The schematic block diagram which shows the structural example of the function implementation part by CPU of a main control part. Explanatory drawing which shows an example of a mode that one file was divided | segmented and recorded on the optical disk. Explanatory drawing which shows an example of a mode that the dispersion | distribution file is recorded on the optical disk in order. Explanatory drawing which shows an example of a mode that the dispersion | distribution file is recorded on the optical disk at random. Explanatory drawing which shows an example of a mode that the dispersion | distribution file is divided | segmented by the division | segmentation number larger than predetermined number, and is recorded on the optical disk. FIG. 3 is an explanatory diagram illustrating an example of a state in which a distributed file is recorded on the optical disc 1 by being divided so that at least one size of file elements constituting the file is smaller than a predetermined size. FIG. 3 is a flowchart showing a procedure for extracting, during disc analysis, a file that is likely to cause a malfunction during playback from among the files divided and recorded on the optical disc by the main control unit of the optical disc playback apparatus shown in FIG. 1; (A) is an explanatory diagram showing a display example when there are files having a number of divisions greater than a predetermined number, and (b) is a case where there are files in a division state in which the number of divisions is equal to or less than the predetermined number and which interferes with reproduction Explanatory drawing which shows the example of a display. FIG. 10 is a subroutine flowchart showing a procedure of disk analysis processing executed by the CPU in step S7 of FIG. 9; FIG. Explanatory drawing which shows an example of the data structure of a file entry.

  Embodiments of an optical disc playback apparatus and optical disc playback method according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic block diagram showing an embodiment of an optical disk reproducing apparatus according to the present invention. The present invention can be applied to an electronic device capable of reproducing an optical disc on which a divided file is recorded. As this type of optical disk, various types such as CD-R / RW / RAM / ROM and DVD-R / RW / RAM / ROM can be used. In the present embodiment, an optical disk reproducing apparatus capable of reproducing an optical disk recorded by UDF will be described.

  As shown in FIG. 1, the optical disc playback apparatus 10 includes a pickup unit 11, a pickup control unit 20, a main control unit 30, a file buffer 31 as an analysis result storage unit, a display unit 40, and a network connection unit 50.

  The pickup unit 11 includes an objective lens 12 that focuses the laser beam on the optical disc 1, and an objective lens 12 that is perpendicular (thickness) direction (focus direction) and horizontal (radius) direction (tracking direction) to the recording surface of the optical disc 1. At least an objective lens moving section 13 for moving the optical disk 1 and a reflected light detecting section 14 for detecting the reflected light of the optical disc 1 and outputting in accordance with the reflected light. The objective lens moving unit 13 is controlled by the pickup control unit 20. The objective lens moving unit 13 can be configured by a coil or a magnet when magnetic force is used for moving the objective lens 12.

  The reflected light detection unit 14 includes a plurality of light detection cells (such as photodiodes) arranged on one surface at a position where the reflected light of the optical disc 1 can be received. This light detection cell receives the laser reflected light from the recording surface of the optical disc 1 at each position, and performs output according to the intensity of the received light.

  The pickup control unit 20 receives the information of the laser reflected light from the recording surface of the optical disc 1 from the reflected light detection unit 14, generates a focus error (FE) signal and a tracking error (TE) signal, and is focused on the optical disc 1. The objective lens moving unit 13 is controlled so that the objective lens 12 is moved so that the laser is positioned at the just focus (the state where the laser is focused on the recording surface) and the just track (the state where the laser is positioned at the center of the track). .

  The data reproduction circuit 21 reproduces the recording data of the optical disc 1 based on the reproduction clock signal received from the PLL (Phase Locked Loop) control circuit 22.

  The main control unit 30 is configured by a storage medium such as a CPU, a RAM, and a ROM, and controls the processing operation of the optical disc playback apparatus 10 according to a program stored in the storage medium.

  The CPU of the main control unit 30 loads a hard-to-reproduce file extraction program stored in a storage medium such as a ROM and data necessary for executing the program into the RAM, and is divided on the optical disk according to the program. A process of extracting a file that may cause a problem during playback from the recorded files is performed during disk analysis.

  The RAM of the main control unit 30 provides a work area for temporarily storing programs and data executed by the CPU.

  The storage medium such as the ROM of the main control unit 30 stores a startup program for the optical disc playback apparatus 10, a difficult-to-play file extraction program, and various data necessary for executing these programs.

  A storage medium such as a ROM has a configuration including a recording medium readable by a CPU, such as a magnetic or optical recording medium or a semiconductor memory, and a part of programs and data in the storage medium. Or you may comprise so that all may be downloaded via an electronic network.

  The file buffer 31 serving as an analysis result storage unit is a hierarchy of files and directories excluding files determined to be in a state in which the division state may interfere with reproduction as a result of disk analysis under the control of the main control unit 30. Memorize structure and content.

  FIG. 2 is an explanatory diagram showing an example of a state in which the storage area of the file buffer 31 is effectively used by excluding registration of files that are difficult to reproduce.

  Since the file buffer 31 has an upper limit in storage capacity, the total number of directories and files that can be registered in the file buffer 31 also has an upper limit number (for example, 510). The upper limit number is the upper limit number of directories and files that can be recognized by the optical disc reproducing apparatus 10 during disc analysis when the optical disc 1 is loaded. Since there is a reduction in recognition, if a file that is difficult to reproduce is registered in the file buffer 31, the finite storage capacity of the file buffer 31 is wasted. Therefore, as shown in FIG. 2, the optical disc playback apparatus 10 according to the present embodiment does not register the file determined to be in a state in which the division state may interfere with playback in the file buffer 31. It is configured as follows.

  The display unit 40 is configured by a general display output device such as a liquid crystal display or an OLED (Organic Light Emitting Diode) display, for example, and displays the operation state of the optical disc playback apparatus 10 under the control of the main control unit 30. Further, the display unit 40 displays information to that effect when there is a file that is determined to be in a state where the division state may interfere with reproduction in the disk analysis under the control of the main control unit 30.

  The network connection unit 50 implements various information communication protocols according to the network form. The network connection unit 50 connects the optical disc playback apparatus 10 and other electrical devices according to these various protocols. For this connection, an electrical connection via an electronic network can be applied. Here, an electronic network means an information communication network using telecommunications technology in general, in addition to a wireless / wired LAN (Local Area Network) and the Internet network, a telephone communication line network, an optical fiber communication network, a cable communication network, Includes satellite communications networks.

  FIG. 3 is a schematic block diagram illustrating a configuration example of the function realization unit by the CPU of the main control unit 30. In addition, this function realization part may be comprised by hardware logics, such as a circuit, without using CPU.

  As shown in FIG. 3, the CPU of the main control unit 30 functions as at least the disk analysis unit 32 and the notification unit 33 by the hard-to-reproduce file extraction program. Each of the units 32 and 33 uses a required work area of the RAM as a temporary storage location for data.

  When the optical disk 1 is loaded, the disk analysis unit 32 analyzes the hierarchical structure and contents of directories and files recorded on the optical disk 1 from signals read from the optical disk 1. The disk analysis unit 32 includes a division state acquisition unit 34, a file registration determination unit 35, and an analysis result writing unit 36.

  The notification unit 33 causes the display unit 40 to display information indicating that there is a file that is determined by the file registration determination unit 35 of the disk analysis unit 32 to be in a state where the division state may interfere with reproduction. .

  The division state acquisition unit 34 acquires the division state of the file recorded on the optical disc 1.

  The file registration determination unit 35 receives information on the division state of the file from the division state acquisition unit 34 and determines whether or not the division state is in a state where there is no possibility of disturbing reproduction.

  The analysis result writing unit 36 registers file information in the file buffer 31 when the divided state is in a state where there is no possibility that the reproduction will be hindered.

  Here, among files recorded separately on the optical disc 1, files that may interfere with reproduction will be briefly described.

  FIG. 4 is an explanatory diagram showing an example of a state in which one file is divided and recorded on the optical disc 1. FIG. 5 is an explanatory diagram showing an example of a state in which distributed files are sequentially recorded on the optical disc 1.

  As shown in FIG. 4, ISO9660 and UDF allow one file to be distributed and written on an optical disk. When playing back the divided files, the optical disk playback device 10 performs a file search process on the optical disk 1 in parallel with the playback process. As shown in FIG. 5, when the number of divisions is not more than a predetermined number (for example, 127, etc., see FIG. 7) and the data is sequentially recorded on the optical disc 1, the time required for the file search process can be reduced. Therefore, it can be said that the file in the divided state as shown in FIG. 5 is a file in the divided state that does not interfere with the reproduction.

  Here, “the distributed file is recorded in order on the optical disc 1” means that the file is divided and configured by a plurality of file elements, and the file element at the end of the file of the continuous file elements is recorded. It is assumed that the logical address is larger than the logical address at which the file element on the head side of the file is recorded.

  FIG. 6 is an explanatory diagram showing an example of a state in which distributed files are randomly recorded on the optical disc 1.

  As shown in FIG. 6, when the distributed file is randomly recorded on the optical disc 1, the time required for the file search process becomes long. For this reason, it can be said that the file in the divided state as shown in FIG. 6 is a file in a divided state (non-corresponding file) that hinders reproduction.

  Here, “the distributed file is randomly recorded on the optical disc 1” means that the file is divided and configured by a plurality of file elements, and the file element at the end of the file of the continuous file elements is recorded. The logical address is smaller than the logical address at which the file element at the head of the file is recorded.

  FIG. 7 is an explanatory diagram showing an example of a state in which the distributed file is divided into a number greater than the predetermined number and recorded on the optical disc 1.

  As shown in FIG. 7, when a distributed file is divided into a larger number than the predetermined number and recorded on the optical disc 1, the time required for the file search process becomes long and the reproduction necessary for the file search process is performed. The capacity of the buffer will increase. For this reason, it can be said that the file in the divided state as shown in FIG. 7 is a file in the divided state having a trouble in reproduction. In the following description, an example in which the predetermined number is 127 will be described.

  FIG. 8 is an explanatory diagram showing an example of a state in which a distributed file is recorded on the optical disc 1 by being divided so that at least one of the file elements constituting the file is smaller than a predetermined size.

  As shown in FIG. 8, when the size of the file elements constituting the divided file is smaller than a predetermined size, the data reproduced and output by the reproduction process is larger than the data accumulated in the reproduction buffer by the file search process. As a result, a buffer underrun may occur. For this reason, it can be said that a file in a divided state as shown in FIG. 8 is a file in a divided state that hinders reproduction. In the following description, an example in which the predetermined size is 20 sectors will be described.

  Next, an example of the operation of the optical disc playback apparatus 10 according to the present embodiment will be described.

  FIG. 9 shows a case where a main control unit 30 of the optical disk reproducing apparatus 10 shown in FIG. 1 extracts a file that may cause a problem during reproduction from among the files divided and recorded on the optical disk at the time of disk analysis. It is a flowchart which shows a procedure. In FIG. 9, the code | symbol which attached | subjected the number to S shows each step of a flowchart. In the following description, an example in which the optical disc 1 is recorded in UDF will be described.

  This procedure starts when the optical disc 1 on which the divided files are recorded is loaded into the optical disc playback apparatus 10.

  First, in step S1, the disk analysis unit 32 acquires information indicating that the loaded optical disk 1 is a disk recorded in the UDF format.

  Next, in step S2, the disk analysis unit 32 analyzes an AVDP (Anchor Volume Descriptor Pointer), acquires pointer information indicating the position of a VDS (Volume Descriptor Sequence), and specifies the position of the VDS.

  Next, in step S3, the disk analysis unit 32 analyzes the VDS, specifies the position of the PD (Partition Descriptor) from the descriptor in the VDS area, and acquires the partition start address necessary for the disk analysis. Further, the disk analysis unit 32 analyzes the VDS, specifies the position of the LVD (Logical Volume Descriptor) from the descriptor in the VDS area, and has a VAT (Virtual Allocation Table) necessary for the disk analysis. Get information about whether or not.

  Next, in step S4, the disk analysis unit 32 determines whether or not VAT exists based on the LVD analysis result. If VAT exists, the process proceeds to step S5. On the other hand, if no VAT exists, the process proceeds to step S6.

  In step S5, the disk analysis unit 32 acquires VAT information.

  Next, in step S6, the disk analysis unit 32 analyzes an FSD (File Set Descriptor) and obtains information on the position of the file entry in the root directory. Specifically, if there is no VAT, the FSD in which the file entry (FE: File Entry) in the root directory is sequentially searched from the partition start address obtained from the PD, and information on the position of the file entry in the root directory is obtained. To do. When there is VAT, the file entry (FE: File Entry) position in the root directory is indicated by a virtual block number in the FSD, so the VAT is searched by this virtual block number and the logical block of the file entry in the root directory. Get the number.

  Next, in step S7, the disk analysis unit 32 starts from the information control block (ICB) group indicating the entry position of the child directory / file below the root directory indicated by the file entry of the root directory. While analyzing the directory / file structure, disk analysis processing is executed so as not to register a file (non-corresponding file) in a state where the division state may interfere with reproduction in the file buffer 31.

  Next, in step S8, the disk analysis unit 32 determines whether or not there is a file in a state in which the division state may interfere with reproduction in the disk analysis. If there is a file in a state where the division state may interfere with reproduction, the process proceeds to step S9. On the other hand, when there is no file in a state where the division state may interfere with reproduction, the series of procedures ends.

  Next, in step S <b> 9, the notification unit 33 causes the display unit 40 to display information indicating that there is a file in a state where the division state may interfere with reproduction.

  FIG. 10 is an explanatory diagram illustrating an example of information displayed on the display unit 40 by the notification unit 33. FIG. 10A is a display example in the case where there are files whose division number is greater than a predetermined number (see FIG. 7). FIG. 6B is an explanatory diagram showing a display example in the case where there is a file in a divided state in which the number of divisions is equal to or less than a predetermined number and which interferes with reproduction (see FIGS. 6 and 8).

  As shown in FIG. 10, when there is a file whose division state may interfere with reproduction, information to that effect is notified to the user via the display unit 40 by the notification unit 33. As a result, the user can recognize that there is a file (non-corresponding file) that is not subject to recognition due to the file division condition.

  According to the above procedure, a file that is likely to cause a problem during reproduction can be extracted at the time of disc analysis from among files that are divided and recorded on the optical disc.

  Next, a procedure for executing the disk analysis processing so as not to register a file (non-corresponding file) in a state in which the division state may interfere with reproduction will be described.

  FIG. 11 is a subroutine flowchart showing the procedure of the disk analysis process executed by the CPU in step S7 of FIG. In FIG. 11, reference numerals with numbers added to S indicate the steps in the flowchart. FIG. 12 is an explanatory diagram showing an example of the data structure of the file entry.

  In step S701, the disk analysis unit 32 acquires file entry information.

  In step S702, the disc analysis unit 32 acquires file type information based on the file entry information.

  Next, in step S703, the disk analysis unit 32 determines whether the file type is a file or a directory. If the file type is a file, the process proceeds to step S704. On the other hand, if the file type is not a file, that is, if it is a directory, the process proceeds to step S717.

  In step S704, the disk analysis unit 32 acquires file size information based on the file entry information.

  Next, in step S705, the disk analysis unit 32 acquires size information of one-part data. In the present embodiment, an example in which the size of one divided data is 16 bytes will be described.

  The divided data exists for each file element. The divided data includes the size of each file element, the start address, information on the number of file elements from the start of the file, and the like.

  Next, in step S706, the disk analysis unit 32 acquires the division number data length. The division number data length represents the size of the entire divided data group recorded together in the file entry. For example, the division number data length shown in FIG. 12 is indicated by “80” “05” “00” “00”. This means that the size of the entire divided data group is 0x000000580 bytes, that is, 1408 bytes.

  In step S707, the division state acquisition unit 34 calculates the division number of the file by dividing the division number data length by the size of one division data. In the example shown in FIG. 12, the number of divisions is 1408/16 = 88. The division state acquisition unit 34 stores information on the number of divisions in a required work area of the RAM.

  Next, in step S708, the file registration determination unit 35 determines whether or not the file is divided and recorded on the optical disc 1 by a division number larger than a predetermined number (for example, 127). If the number of divisions is greater than the predetermined number, it is determined that the file is in a divided state that hinders reproduction, and the process proceeds to step S716. On the other hand, if the number of divisions is less than or equal to the predetermined number, the process proceeds to step S709.

  Next, in step S709, the division state acquisition unit 34 acquires at least the size of each file element, the start address, and the number of the file element from the beginning of the file by acquiring the content (division information) of the divided data. Get the information. Further, the division state acquisition unit 34 stores the acquired information of the start address in a required work area of the RAM.

  Next, in step S710, the file registration determination unit 35 compares the start address of the file element that was noticed last time stored in the required work area of the RAM with the start address of the file element that is currently noticed. It is determined whether or not the start address of the file element being processed is larger than the start address of the file element focused on the previous time.

  If the start address of the file element currently focused on is smaller than the start address of the file element focused on the previous time, that is, “the logical address where the file element at the end of the file of the continuous file element is recorded is If the file element has a value smaller than the recorded logical address ”, it is determined that the file is in a divided state that hinders reproduction, and the process proceeds to step S716. On the other hand, when the head address of the file element currently focused on is larger than the head address of the file element focused on last time, the process proceeds to step S711.

  Next, in step S711, the file registration determination unit 35 determines whether the size of the currently focused file element is equal to or larger than a predetermined size. If it is smaller than the predetermined size, it is determined that the file is in a divided state that hinders reproduction, and the process proceeds to step S716. On the other hand, if the size is not less than the predetermined size, the process proceeds to step S712.

  Next, in step S712, the file analysis unit stores the content (division information) of the division data of the file element currently focused on in a required work area of the RAM. This is because the division information of all the file elements constituting one file is put together in consideration of convenience at the time of file reproduction. In the following description, this collective information is referred to as a division table.

  Next, in step S713, the file analysis unit subtracts 1 from the division number stored in the required work area of the RAM to obtain a new division number.

  Next, in step S714, the file analysis unit determines whether or not the new number of divisions stored in the required work area of the RAM is zero. If the new number of divisions is 0, it is determined that the analysis of the currently focused file has been completed, and the process proceeds to step S715. On the other hand, if the new number of divisions is not 0, it is determined that there is a file element that has not been analyzed in the currently focused file, and the process returns to step S709 to analyze the next file element again.

  Next, in step S715, the analysis result writing unit 36 adds 1 to the number of analyzes stored in the required work area of the RAM. If step S718 and step S718 have not been executed, the analysis result writing unit 36 provides an area for storing the number of analyzes in a required work area of the RAM and writes 1. In addition, the analysis result writing unit 36 registers the information of the currently focused file in the file buffer 31, and proceeds to step S719.

  On the other hand, if it is determined in any of step S708, step S710, and step S711 that the file is in a divided state that hinders reproduction, in step S716, the analysis result writing unit 36 stores it in the required work area of the RAM. 1 is added to the number of non-corresponding files, and the process proceeds to step S719. When this step is executed for the first time, the analysis result writing unit 36 provides an area for storing the number of non-corresponding files in a required work area of the RAM and writes 1 therein. At this time, information on the file of interest is not registered in the file buffer 31.

  On the other hand, when it is determined in step S703 that the file type is a directory, in step S717, the disk analysis unit 32 analyzes the directory.

  Next, in step S718, the analysis result writing unit 36 adds 1 to the number of analyzes stored in the required work area of the RAM. If this step and step S715 have not been executed, the analysis result writing unit 36 provides an area for storing the number of analyzes in the required work area of the RAM and writes 1 therein. Further, the analysis result writing unit 36 registers information on the directory currently focused on in the file buffer 31.

  Next, in step S719, the disk analysis unit 32 determines whether or not the number of analyzes stored in the required work area of the RAM is equal to or greater than the recognition upper limit number (for example, 510) of the file buffer 31. If the number of analyzes is equal to or greater than the recognition upper limit number of the file buffer 31, the disk sequence cannot be registered in the file buffer 31 even if the disk analysis is performed any more, and the series of procedures ends. On the other hand, if the number of analyzes is smaller than the recognition upper limit number of the file buffer 31, the process proceeds to step S720.

  Next, in step S720, the disk analysis unit 32 determines whether the total of the number of analyzes stored in the required work area of the RAM and the number of unsupported files is equal to or greater than the number of all files stored in the optical disk 1. Determine. If the total of the number of analyzes and the number of non-corresponding files is equal to or greater than the total number of files, it is determined that the analysis has been completed for all directories and files stored on the optical disc 1, and the series of procedures is completed. On the other hand, if the sum of the number of analyzes and the number of non-corresponding files is smaller than the total number of files, the process returns to step S701 to continuously acquire the file entry information of the next file.

  According to the above procedure, the disk analysis process can be executed so that a file (non-corresponding file) in a state where the division state may interfere with reproduction is not registered in the file buffer 31.

  The optical disk reproducing apparatus 10 according to the present embodiment extracts a file (non-corresponding file) in a state in which the division state may interfere with reproduction from among the files divided and recorded on the optical disk, This type of file is not registered in the file buffer 31. For this reason, a file in which troubles such as skipping or interruption of sound occur due to the divided state during reproduction is not recognized in the first place. Therefore, the optical disc playback apparatus 10 according to the present embodiment can prevent user dissatisfaction due to playback of a file in a state where the split state may interfere with playback.

  In addition, the optical disk reproducing apparatus 10 according to the present embodiment extracts a file (non-corresponding file) in a state where the division state may interfere with reproduction at the time of disk analysis, the notification unit 33 displays the display unit 40 to the user. Information to that effect is notified. For this reason, the user can recognize that there is a problem file on the optical disc 1.

  Also, the optical disc playback apparatus 10 according to the present embodiment prevents the file buffer 31 from registering a file (non-corresponding file) in a state where the split state may interfere with playback. Therefore, the limited resource of the file buffer 31 can be used for other reproducible files.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment.

  Further, in the embodiment of the present invention, each step of the flowchart shows an example of processing that is performed in time series in the order described. The process to be executed is also included.

DESCRIPTION OF SYMBOLS 1 Optical disk 10 Optical disk reproducing | regenerating apparatus 11 Pickup part 12 Objective lens 13 Objective lens moving part 14 Reflected light detection part 20 Pickup control part 21 Data reproduction circuit 22 PLL control circuit 30 Main control part 31 File buffer (analysis result storage part)
32 disk analysis unit 33 notification unit 34 division state acquisition unit 35 file registration determination unit 36 analysis result writing unit 40 display unit 50 network connection unit

Claims (6)

When an optical disk is loaded, a disk analysis unit that analyzes the hierarchical structure and contents of directories and files recorded on the optical disk from signals read from the optical disk;
An analysis result storage unit to which an analysis result of the optical disc including information on the analyzed file is written by the disc analysis unit;
With
The disk analysis unit
A division state acquisition unit for acquiring a division state of a file divided into a plurality of file elements ;
If the logical address at which the file element at the end of the file of the consecutive file elements is recorded is smaller than the logical address at which the file element at the head of the file is recorded, the division state hinders playback. A file registration determination unit that determines whether or not the division state does not cause a problem in reproduction by determining that it is in a state that may cause
An analysis result writing unit that registers the information of the file in the analysis result storage unit when the division state is in a state where there is no possibility of disturbing reproduction;
An optical disc reproducing apparatus comprising: When an optical disk is loaded, a disk analysis unit that analyzes the hierarchical structure and contents of directories and files recorded on the optical disk from signals read from the optical disk;
An analysis result storage unit to which an analysis result of the optical disc including information on the analyzed file is written by the disc analysis unit;
With
The disk analysis unit
A division state acquisition unit for acquiring a division state of a file divided into a plurality of file elements ;
When the file element has a size smaller than a predetermined size, it is determined that the division state does not interfere with reproduction by determining that the division state may interfere with reproduction. A file registration determination unit for determining whether there is,
An analysis result writing unit that registers the information of the file in the analysis result storage unit when the division state is in a state where there is no possibility of disturbing reproduction;
An optical disc reproducing apparatus comprising: A notification unit that displays information on the display unit when there is a file determined by the file registration determination unit to be in a state where the division state may interfere with reproduction;
Moreover, the optical disc reproducing apparatus according to claim 1 or 2 comprising a. Loading an optical disc; and
Analyzing the hierarchical structure and contents of directories and files recorded on the optical disc from signals read from the optical disc;
Registering the analysis result of the optical disc including the information of the file analyzed in the step of analyzing the hierarchical structure and contents of directories and files recorded on the optical disc in an analysis result storage unit;
Have
Analyzing the hierarchical structure and contents of directories and files recorded on the optical disc,
Obtaining a division state of a file that is divided and configured by a plurality of file elements ;
If the logical address at which the file element at the end of the file of the consecutive file elements is recorded is smaller than the logical address at which the file element at the head of the file is recorded, the division state hinders playback. Determining whether or not the division state is a state where there is no possibility of causing a trouble in reproduction by determining that the state is likely to cause
Storing the information of the file in the analysis result storage unit when the division state is in a state where there is no possibility of disturbing reproduction;
An optical disc reproducing method comprising: Loading an optical disc; and
Analyzing the hierarchical structure and contents of directories and files recorded on the optical disc from signals read from the optical disc;
Registering the analysis result of the optical disc including the information of the file analyzed in the step of analyzing the hierarchical structure and contents of directories and files recorded on the optical disc in an analysis result storage unit;
Have
Analyzing the hierarchical structure and contents of directories and files recorded on the optical disc,
Obtaining a division state of a file that is divided and configured by a plurality of file elements ;
When the file element has a size smaller than a predetermined size, it is determined that the division state does not interfere with reproduction by determining that the division state may interfere with reproduction. Determining whether there is,
Storing the information of the file in the analysis result storage unit when the division state is in a state where there is no possibility of disturbing reproduction;
An optical disc reproducing method comprising: If there is a file in which it is determined in the step of determining whether or not the division state is in a state that does not interfere with reproduction, the division state is in a state that may impede reproduction. Displaying information on the display unit;
The optical disc reproducing method according to claim 4 or 5, further comprising:

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