JP4264668B2 - REPRODUCTION DEVICE, REPRODUCTION METHOD, AND PROGRAM STORAGE MEDIUM - Google Patents

Description

  The present invention relates to a playback device, a playback method, and a program storage medium, and in particular, index information of a file recorded on a recording medium, a portion having a fixed data length and a portion having a variable data length. The present invention relates to a reproducing apparatus, a reproducing method, and a program storage medium for reproducing data recorded in a recording apparatus that generates an index file that is separately stored and records the index file on a recording medium.

  Conventionally, for example, in a recording apparatus that records video data, audio data, etc., such as a camcorder, a plurality of data recording several scenes is recorded for each file on a disk-shaped recording medium such as a magneto-optical disk or an optical disk. The In addition, such a recording apparatus includes a display unit such as a liquid crystal display panel or an organic electroluminescence display panel, and a sound generation unit such as a speaker, so that the recording / reproducing function has a function of reproducing and editing recorded data. The device is known.

  A user (user) who uses such a recording apparatus or recording / reproducing apparatus, when the recording medium has a large capacity, has one scene at a different recording date, a scene at a different travel destination, a scene at a different event, etc. It is often recorded on a recording medium.

  In such a recording medium in which a plurality of scenes are recorded for each file, the user can select desired data as a reproduction / editing target by designating the file.

  By the way, a desired file is generally designated by inputting, for example, a file name. However, when a plurality of files, particularly a large number of files, are recorded on a recording medium, the user can select a desired file. It is difficult to memorize all file names.

  For this reason, it is convenient to have an index file (index file) that summarizes information (index information) for identifying the contents of a plurality of files recorded on a recording medium. The index file sequentially stores the index information of a plurality of files in association with the plurality of files. The recording / reproducing apparatus displays each index information corresponding to a plurality of files on the display unit based on the index file, and the user may refer to this to designate a desired file.

  When a plurality of files can be searched using such an index file, a certain file may be replaced with another file by editing by the user, or only the file name may be rewritten for a specific file. In such a case, the amount of index information in the file to be edited may differ before and after editing, and the storage location for each index information in the index file is different before and after editing. It will be different. Therefore, it may not be possible to cope with the change of the index file by rewriting only the place where the index information corresponding to the edited file is stored with the new index information. For this reason, it is necessary to rewrite the entire index file or rewrite the part after the place where the index information corresponding to the edited file is stored.

  However, when the number of files managed by the index file is large, the amount of data in the index file increases, which causes a problem that it takes a long time to write the index file to the recording medium. In addition, depending on the material and recording method of the recording medium, it takes a long time for the writing process, so that there is a problem that the writing time of the index file becomes long.

  Therefore, according to the present invention, by dividing the index information into a portion having a fixed data length and a portion having a variable data length, the index file can be rewritten at high speed even when the index file is rewritten. An object of the present invention is to provide a playback apparatus that can play back information that can be played back.

The playback apparatus according to the present invention manages a plurality of pieces of information related to a file or folder in a hierarchical structure, and among the plurality of pieces of information, attribute information indicating attributes of the file or folder has a fixed data length. An index file that is information that is divided into first attribute information in which only certain fields are collected and second attribute information that includes a field having a variable data length, and stores the first attribute information and the second attribute information in association with each other ; And reproducing means for reproducing the file from the recording medium, operation input means for receiving the operation input from the user, and reproducing means for reproducing the plurality of information based on each information indicating the position of the plurality of information in the index file. And the first attribute information and the second attribute based on predetermined information included in the first attribute information or the second attribute information among the plurality of reproduced information Identifying the relationship between distribution, based on its relevance, to reproduce the index data included in the index file, among the index data included in the index file displayed, depending on the operation input from the operation input unit when there is a second attribute information associated with the first attribute information corresponding to the specified index data Te, it provided based on the first attribute information and the second attribute information, and control means for reproducing the corresponding file.
The control means identifies relevance between the first attribute information and the second attribute information based on information indicating whether or not the second attribute information included in the first attribute information is included among the plurality of reproduced information. can do.
The control means can identify the relevance between the first attribute information and the second attribute information based on the explicit information that clearly indicates the hierarchical structure included in the second attribute information among the plurality of reproduced information. .

The second attribute information can include information for identifying the file or folder.

A plurality of information may include an excerpt information of a file or folder.

The plurality of information can include image data associated with the file or folder.

The plurality of information can include audio data associated with the file or folder.

The plurality of information can include text data associated with the file or folder.

Reproducing method of the present invention, a reproducing apparatus for reproducing information recorded on a recording medium, a plurality of information associated with a file or folder is information for managing in a hierarchical structure, among the plurality of information, file or The attribute information indicating the attribute of the folder is divided into first attribute information in which only fields with a fixed data length are collected and second attribute information with a field with a variable data length. A plurality of pieces of information are reproduced based on each piece of information indicating positions of a plurality of pieces of information in the index file, which is information stored in association with the second piece of attribute information. Based on the predetermined information included in the two attribute information, the relevance between the first attribute information and the second attribute information is identified, and the index data included in the index file is recorded. Reproduced from the body, the operation input from a user, among the index data included in the index file displayed, receiving a designation of a predetermined index data, corresponding to a predetermined index data designated by the operation input from the user When there is second attribute information associated with the first attribute information to be performed, a step of reproducing a corresponding file based on the first attribute information and the second attribute information is included.

The program recorded in the program storage medium of the present invention is information for managing a plurality of information related to a file or folder in a hierarchical structure, and attribute information indicating the attribute of the file or folder is included in the plurality of information. The first attribute information in which only the fields having a fixed data length are collected and the second attribute information including the fields having a variable data length are stored in association with the first attribute information and the second attribute information. A plurality of pieces of information are reproduced based on each piece of information indicating the position of a plurality of pieces of information in the index file, and a predetermined attribute included in the first attribute information or the second attribute information among the reproduced pieces of information. Based on the information, the association between the first attribute information and the second attribute information is identified, and the index data included in the index file is reproduced from the recording medium. Allowed by the operation input from the user, among the index data included in the index file displayed, receiving a designation of a predetermined index data, the corresponding predetermined index data designated by the operation input from the user 1 When there is second attribute information associated with the attribute information, the computer is caused to execute a process including a step of reproducing the corresponding file based on the first attribute information and the second attribute information .

Playback apparatus and method of the present invention, and, in the program recorded in a program storage medium, a plurality of information associated with a file or folder is information for managing in a hierarchical structure, among the plurality of information, file or The attribute information indicating the attribute of the folder is divided into first attribute information in which only fields with a fixed data length are collected and second attribute information with a field with a variable data length. based on the information indicating the positions of the plurality of information in the index file is information for housing in association with the second attribute information, a plurality of information is reproduced, among a plurality of information reproduced, or the first attribute information Based on predetermined information included in the two-attribute information, the relevance between the first attribute information and the second attribute information is identified and included in the index file It is reproduced emissions index data from the recording medium. Then, a first index corresponding to the predetermined index data specified by the user's operation input is received by receiving the specification of the predetermined index data among the index data included in the displayed index file by the operation input from the user . When there is second attribute information associated with the attribute information, the corresponding file is played based on the first attribute information and the second attribute information .

  According to the reproducing apparatus and the reproducing method according to the present invention, information can be reproduced. In particular, in the index file, the attribute information indicating the attribute of the file or folder includes first attribute information in which only a field having a fixed data length is collected, and second attribute information including a field having a variable data length. The first attribute information and the second attribute information are stored in association with each other based on the explicit information that clearly indicates the hierarchical structure. Therefore, even if the data length of the entire attribute information changes when the contents of the index file are changed by editing the file recorded on the recording medium, the variable part is only the variable length part. Therefore, only the variable length portion needs to be re-recorded on the recording medium. That is, according to the playback device and the playback method according to the present invention, a file can be played based on an index file having such characteristics.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected about the same structure. (First Embodiment) FIG. 1 is a block diagram showing an example of the configuration of a digital recording / reproducing apparatus.

  In FIG. 1, a digital recording / reproducing apparatus includes a video encoder 11, an audio encoder 12, a video decoder 13, an audio decoder 14, a file generator 15, a file decoder 16, memories 17 and 20, a memory controller 18, and a system. A control microcomputer 19, an error correction code / decoder 21, a drive control microcomputer 22, a data modulator / demodulator 23, a magnetic field modulation driver 24, an operation unit 26, a servo circuit 30, a motor 31, a magnetic field head 32, and an optical pickup 33 are configured. The

  The video signal is supplied from the video input terminal to the video encoder 11 and compressed and encoded. The audio signal is supplied from the audio input terminal to the audio encoder 12 and compressed and encoded. Each output of the video encoder 11 and the audio encoder 12 is called an elemental list.

  In the present embodiment, it is assumed that the digital recording / reproducing apparatus is provided in a camera-integrated digital recording / reproducing apparatus. An image captured by a video camera is supplied as the video signal, and the video camera generates a video signal by supplying imaging light of a subject to an imaging device such as a CCD (Charge Coupled Device) by an optical system. The audio signal is supplied with the sound collected by the microphone.

  For example, when the compression encoding is MPEG (MPPEG), the video encoder 11 is an analog / digital converter (hereinafter abbreviated as “A / D”), a format conversion unit, an image rearrangement unit, and a subtraction. , DCT unit, quantization unit, variable length coding unit, buffer memory, rate control unit, inverse quantization unit, inverse DCT unit, addition unit, frame memory, motion compensation prediction unit and switch electronic circuit Composed.

  The video signal supplied to the video encoder 11 is digitized by A / D, converted to a spatial resolution used for encoding by the format conversion unit, and output to the image rearrangement unit. The image rearrangement unit rearranges the order of the pictures in an order suitable for the encoding process. That is, the I picture and the P picture are encoded first, and then rearranged in an order suitable for encoding the B picture.

  The output of the screen rearrangement unit is input to the DCT unit via the subtraction unit, and DCT encoding is performed. The output of the DCT unit is input to the quantization unit and quantized with a predetermined number of bits. The output of the quantization unit is input to the variable length coding unit and the inverse quantization unit. The variable-length encoding unit is encoded with a variable-length code that assigns a shorter code to data with a higher appearance frequency, for example, a Huffman code, and the encoded data is output to a buffer memory of the memory. The buffer memory outputs encoded data as an output of the video encoder at a constant rate. The rate control unit controls the quantization operation of the quantization unit so as to maintain a predetermined bit rate by monitoring the buffer memory because the amount of code generated by the variable length coding unit is variable.

  On the other hand, in the case of an I picture and a P picture, since they are used as a reference screen by the motion compensation prediction unit, the signal input from the quantization unit to the inverse quantization unit is input to the inverse DCT unit after being inversely quantized. Inverse DCT is performed. The output of the inverse DCT unit is added to the output of the motion compensation prediction unit by the addition unit and input to the frame memory. The output of the frame memory is input to the motion compensation prediction unit. The motion compensation prediction unit performs forward prediction, backward prediction, and bidirectional prediction, and outputs the results to the addition unit and the subtraction unit. These inverse quantization unit, inverse DCT unit, addition unit, frame memory and motion compensation prediction unit constitute a local decoding unit, and the same video signal as that of the video decoder is restored.

  The subtraction unit performs subtraction between the output of the image rearrangement unit and the output of the motion compensation prediction unit, and generates a prediction error between the video signal and the decoded video signal decoded by the local decoding unit. In the case of intra-frame coding (I picture), the switch causes the subtraction unit to simply pass data without performing subtraction processing.

  Returning to FIG. 1, for example, in the case of MPEG / Audio layer 1 / layer 2, the audio encoder 12 includes electronic circuits such as a subband encoding unit and an adaptive quantization bit allocation unit. The audio signal is divided into subband signals of 32 bands by the subband encoding unit, quantized according to psychoacoustic weighting by the adaptive quantization bit allocation unit, formed into a bit stream, and then output.

  In order to improve coding quality, in the case of MPEG / Audio layer 3, an adaptive block length modified discrete cosine transform unit, aliasing reduction butterfly unit, nonlinear quantization unit, variable length coding unit, etc. are further introduced. Is done.

  The output of the video encoder 11 and the output of the audio encoder 12 are supplied to the file generator 15. The file generator 15 has a video elementary stream and a file structure that can be handled by computer software that can reproduce video, audio, text, and the like synchronously without using a specific hardware configuration. Convert the data structure of an audio elementary list. As such software, for example, QuickTime (hereinafter abbreviated as “QT”) is known. Hereinafter, a case where QT is used will be described. The file generator 15 multiplexes the encoded video data and the encoded audio data. The file generator 15 is controlled by the system control microcomputer 19.

  The QuickTime movie file that is the output of the file generator 15 is sequentially written into the memory 17 via the memory controller 18. The memory controller 18 reads a QuickTime movie file from the memory 17 when data writing to the recording medium 40 is requested from the system control microcomputer 19. The system control microcomputer 19 stores various data generated during the execution of the program in the memory 17 via the memory controller 18.

  Here, the transfer rate of QuickTime movie encoding is set to a transfer rate lower than the transfer rate of write data to the recording medium 40, for example, 1/2. Therefore, while the QuickTime movie file is continuously written in the memory 17, reading of the QuickTime movie file from the memory 17 is intermittently performed while being monitored by the system control microcomputer 19 so that the memory 17 does not overflow or underflow. To be done.

  The QuickTime movie file read from the memory 17 is supplied from the memory controller 18 to the error correction code / decoder 21. The error correction code / decoder 21 once writes this QuickTime movie file into the memory 20 and generates redundant data of interleaved and error correction codes. The error correction code / decoder 21 reads the data with the redundant data added from the memory 20 and supplies it to the data modulator / demodulator 23.

  When recording the digital data on the recording medium 40, the data modulator / demodulator 23 modulates the data so as to facilitate clock extraction at the time of reproduction and to avoid problems such as intersymbol interference. For example, a (1, 7) RLL (run length limited) code, a trellis code, or the like can be used.

  The output of the data modulator / demodulator 23 is supplied to the magnetic field modulation driver 24 and the optical pickup 33. The magnetic field modulation driver 24 drives the magnetic field head 32 according to the input signal and applies a magnetic field to the recording medium 40. The optical pickup 33 irradiates the recording medium 40 with a recording laser beam according to the input signal. In this way, data is recorded on the recording medium 40.

  The recording medium 40 is a disk-shaped recording medium, for example, a rewritable optical disk such as a magneto-optical disk (MO) or a phase change disk.

  Here, an index file to be described later is recorded in a substantially innermost circumference of a disc-shaped recording medium, for example, a recording portion following a CD (compact disc) lead-in, from the viewpoint of readability. Is preferred.

  In this embodiment, an MO, for example, a relatively small disk such as about 4 cm in diameter, about 5 cm in diameter, about 6.5 cm in diameter, or about 8 cm in diameter is used. The recording medium 40 is rotated by the motor 31 at a constant linear velocity (CLV, constant linear velocity), a constant angular velocity (CAV), or a zone CLV (ZCLV, zone constant linear velocity).

  The drive control microcomputer 22 outputs a signal to the servo circuit 30 in response to a request from the system control microcomputer 19. The servo circuit 30 controls the entire drive by controlling the motor 31 and the optical pickup 33 in accordance with this output. For example, the servo circuit 30 performs movement servo, tracking servo, and focus servo in the radial direction of the recording medium 40 with respect to the optical pickup 33, and controls the rotational speed of the motor 31.

  The system control microcomputer 19 is connected to an operation unit 26 through which a user inputs a predetermined instruction.

  At the time of reproduction, the optical pickup 33 irradiates the recording medium 40 with a laser beam with an output for reproduction, and receives the reflected light with a photodetector in the optical pickup 33 to obtain a reproduction signal. In this case, the drive control microcomputer 22 detects a tracking error and a focus error from the output signal of the photodetector in the optical pickup 33 so that the read laser beam is positioned on the track and focused on the track. The optical pickup 33 is controlled by the servo circuit 30. Further, the drive control microcomputer 22 controls the movement of the optical pickup in the radial direction in order to reproduce data at a desired position on the recording medium 40. The desired position is determined by the system control microcomputer 19 giving a signal to the drive control microcomputer 22 in the same manner as in recording.

  The reproduction signal from the optical pickup 33 is supplied to the data modulator / demodulator 23 and demodulated. The demodulated data is supplied to the error correction code / decoder 21, the reproduced data is temporarily stored in the memory 20, and deinterleaved and error correction is performed. The error-corrected QuickTime movie file is stored in the memory controller. 18 and stored in the memory 17.

  The QuickTime movie file stored in the memory 17 is output to the file decoder 16 in response to a request from the system control microcomputer 19. In order to continuously reproduce the video signal and the audio signal, the system control microcomputer 19 reads the reproduction signal of the recording medium 40 from the memory 17 and reads it from the memory 17 and supplies it to the file decoder 16. By monitoring the data amount, the memory controller 18 and the drive control microcomputer 22 are controlled so that the memory 17 does not overflow or underflow. In this way, the system control microcomputer 19 reads data intermittently from the recording medium 40.

  The file decoder 16 separates the QuickTime movie file into a video elementary stream and an audio elementary file under the control of the system control microcomputer 19. The video elementary stream is supplied to the video decoder 13, is subjected to compression coding decoding, becomes a video output, and is output from the video output terminal. The audio elementary stream is supplied to the audio decoder 14, subjected to compression coding decoding, and is output as an audio output from the audio output terminal. Here, the file decoder 16 outputs so that the video elementary stream and the audio elementary stream are synchronized.

  For example, in the case of MPEG, the video decoder 13 is a memory buffer memory, a variable-length code decoding unit, an inverse quantization unit, an inverse DCT unit, an addition unit, a frame memory, a motion compensation prediction unit, a screen rearrangement unit, and a digital / Analog converter (hereinafter abbreviated as “D / A”). The video elementary list is temporarily stored in the buffer memory and input to the variable length decoding unit. The variable length decoding unit decodes macroblock coding information and separates a prediction mode, a motion vector, quantization information, and a quantized DCT coefficient. The quantized DCT coefficient is restored to the DCT coefficient by the inverse quantization unit, and converted to pixel space data by the inverse DCT unit. The addition unit adds the output of the inverse quantization unit and the output of the motion compensation prediction unit, but does not add when decoding an I picture. All the macroblocks in the screen are decoded, and the screen is rearranged in the original input order by the screen rearrangement unit, converted into an analog signal by D / A, and output. Further, in the case of an I picture and a P picture, the output of the adder is used as a reference screen in the subsequent decoding process, and is therefore stored in the frame memory and output to the motion compensation prediction unit.

  For example, in the case of MPEG / Audio layer 1 / layer 2, the audio decoder 14 includes electronic circuits such as a bit stream decomposition unit, an inverse quantization unit, and a subband synthesis filter bank unit. The input audio elementary stream is separated into a header, auxiliary information, and a quantized subband signal by the bitstream decomposition unit, and the quantized subband signal is inversely quantized with the number of bits allocated by the inverse quantization unit. Are output after being synthesized by the subband synthesis filter bank.

  Next, a camera-integrated digital recording / reproducing apparatus equipped with this recording / reproducing apparatus will be described.

  FIG. 2 is a schematic diagram showing the outer shape of the camera-integrated digital recording / reproducing apparatus. FIG. 2A is an overall view of a camera-integrated digital recording / reproducing apparatus, and FIG. 2B is a schematic diagram showing an example of display on a display panel.

  2A, the camera-integrated digital recording / reproducing apparatus 50 includes a main body 51, a lens unit 52, a sound collecting microphone 53, and a display panel 54.

  The digital recording / reproducing apparatus shown in FIG. The video signal is generated by supplying imaging light of the subject to the imaging device via the optical system of the lens unit 52. The audio signal is generated by the sound collection microphone 53. The display panel 54 includes a liquid crystal display and a piezoelectric element, and displays a playback image and display corresponding to the operation content. The user inputs a desired operation by pressing the display panel 54 with the pointing device 55.

  For example, as shown in FIG. 2B, the display on the display panel 54 is a portion that serves as both the input of the desired operation and the display of the operation content, such as “folder return” 61, “folder advance” 62, “edit” 63, and main display. A display area 64 is provided. The main display area 64 includes a reproduction area 64-1 for displaying a reproduction image, an index area 64-2 for displaying the index data 65, and a scroll bar 64-3 for scrolling the index data.

  Normally, the playback image (moving picture or still picture) displayed in the playback area 64-1 is selected from among a plurality of index data (six index data in FIG. 2B) displayed in the index area 64-2. , The file corresponding to the index data designated by being pressed by the pointing device 55.

  The index data is excerpt information of a disc title or AV file, and the disc title is identification information for distinguishing recording media.

  The “folder return” 61 is pressed by the pointing device 55 or the like, so that in the history of the folder or file specified by the user in the past, the content related to the currently specified folder or file is one time earlier. The display of the playback area 64-1 is changed to the contents related to the folder or file specified in (1).

  “Folder advance” 62 is pressed by the pointing device 55 or the like, and in the history of the folder or file specified by the user in the past, one time later from the contents related to the currently specified folder or file. The display of the playback area 64-1 is changed to the contents related to the designated folder or file.

  “Edit” 63 switches the main display area 64 to an edit screen when pressed by the pointing device 55 or the like.

  In such a camera-integrated digital recording / reproducing apparatus 50, the disc title and file excerpt information are generated when the recording medium 40 is formatted or after shooting, and the information is recorded on the recording medium 40 as an index file. The index file manages the disc title and file excerpt information in a hierarchical file system. The index file according to the present invention is a management information file system in which an OS (operating system) manages a plurality of files recorded on a recording medium, for example, a FAT (file allocation table) used for a flexible disk or a hard disk, or the like. In addition to UDF (universal disk format) used for CD-R / RW, DVD, and the like, an application is created for managing a plurality of files recorded on a recording medium. In the present embodiment, the index file is generated, for example, in the form of a QuickTime movie file. By generating in the QuickTime movie file format, multiple actual data such as video data and audio data, file excerpt information, and disc title can be recorded in the same format. It can be played back with QT.

  The following outlines the QuickTime movie file. QT is software that manages various types of data along a time axis, and is an OS extension function for synchronously playing back moving images, sounds, texts, and the like without using special hardware. QT is disclosed in, for example, “INSIDE MACINTOSH: QuickTime (Japanese version) (Addison Wesles)”.

  The basic data unit of a QT movie resource is called an atom, and each atom contains size and type information along with its data. In QT, the minimum unit of data is handled as a sample, and a chunk is defined as a set of samples.

  FIG. 3 is a diagram illustrating a configuration example of a QuickTime movie file.

  FIG. 4 is a diagram illustrating a configuration example of the video media information atom. FIG. 4 is a diagram showing the video media information atom in FIG. 3 in more detail, and shows a case where the track is video information.

  3 and 4, the QuickTime movie file is mainly composed of two parts, a movie atom 101 and a movie data atom 102. The movie atom 101 is a part for storing information necessary for reproducing the file and information necessary for referring to actual data. The movie data atom 102 is a part that stores actual data such as video data and audio data.

  The movie atom 101 includes a movie header atom 111 that contains information about the entire movie, a movie clipping atom 112 that specifies a clipping region, a user-defined data atom 113, and 1 Alternatively, a plurality of track atoms 114 are included.

  A track atom 114 is prepared for each track in the movie. The track atom 114 includes a track header atom 131, a track clipping atom 132, a track matte atom 133, an edit atom 134 and media. Information relating to individual data of the movie data atom 102 is described in an atom (media atom) 135. In FIG. 3, the track atom 114-1 of one video movie is shown, and the other track atoms are omitted.

  The media atom 135 includes a media header atom 144, a media information atom (video media information atom 145 in FIGS. 3 and 4), and a media handler reference atom ( (media handler reference atom) 146 describes information defining a component for interpreting movie track data and media data.

  The media handler performs mapping from media time to media data using the information of the media information atom.

  The media information atom 145 includes a data handler reference atom 161, a media information header atom, a data information atom 163, and a sample table atom (sample). table atom) 164.

  The media information header atom (video media information header atom 162 in FIG. 4) describes information about the media. The data handler reference atom 161 describes information related to handling of media data, and includes information for designating a data handler component that provides a means for accessing media data. The data information atom 163 includes a data reference atom and describes information about the data.

  The sample table atom 164 contains the information necessary to convert the media time into a sample number that points to the sample location. The sample table atom 164 includes a sample size atom 172, a time-to-sample atom 173, a sync sample atom 174, a sample description atom ( a sample description atom) 175, a sample-to-chunk atom 176, a chunk offset atom 177, and a shadow sync atom 178. is there.

  The sample size atom 172 describes the size of the sample. How many seconds of data are recorded in the time sample atom 173? The relationship between the sample and the time axis is described. The synchronization sample atom 174 describes synchronization information and designates a key frame in the medium. The key frame is a self-contained frame that does not depend on the preceding frame. The sample description atom 175 stores information necessary for decoding a sample in the medium. A media can have one or more sample description atoms, depending on the type of compression type used in the media. The sample chunk atom 176 identifies the sample description corresponding to each sample in the media by referring to the table in the sample description atom 175. The sample chunk atom 176 describes the relationship between the sample and the chunk, and the sample position in the medium is determined based on the information of the first chunk, the number of samples per chunk, and the sample description ID (sample description-ID). Identified. The chunk offset atom 177 describes the start bit position of the chunk within the movie data, and defines the position of each chunk within the data stream.

  In FIG. 3, for example, the movie data atom 102 includes a predetermined number of audio data encoded by a predetermined compression encoding method and image data encoded by a predetermined compression encoding method. Stored in units of chunks consisting of samples. Note that the data does not necessarily need to be compressed and encoded, and linear data can also be stored. For example, when text data, MIDI, or the like is handled, the movie data atom 102 includes actual data such as text, MIDI, and the like. Etc. are included.

  Each track in the movie atom 101 is associated with data stored in the movie data atom 102.

  In such a hierarchical structure, when reproducing data in the movie data atom 102, the QT sequentially follows the hierarchy from the movie atom 101, and based on the atoms 172 to 178 in the sample table atom 164. Then, the sample table is expanded in the memory to identify the relationship between the data. And QT reproduces data based on the relationship between each data.

  Since QT has such a data structure, the index file of this embodiment accommodates the actual data of the disc title and the excerpt information of the file in the movie data atom, and the management information of these actual data is stored. Housed in a movie atom. Further, these actual data are managed in a hierarchical tree structure in which a plurality of folders (directories) are created. The movie data atom of this index file is hereinafter referred to as an index data atom, and the movie atom is referred to as an index atom.

  Here, the index file depends on the data handled by the file recorded on the recording medium. In the present embodiment, the file data is assumed to be image data and audio data. Hereinafter, such a file is abbreviated as “AV file”.

  When the AV file is recorded on the recording medium in this way, the index file contains, for example, four types of data: property, text, thumbnail image (Thumbnail Picture), and intro. The property is data indicating the disc title and the attribute of each AV file. Therefore, the index file is a file in which only properties that contain attribute information are essential files. In the present invention, as will be described later, one characteristic is that the property is divided into a fixed length portion and a variable length portion and accommodated in a movie data atom (index data atom 202). is there.

  The text data is data indicating the disc title and the character string of the title related to each AV file, and the data length is set to a fixed length.

  The thumbnail image data is a typical image data of the disc title and each AV file, and the data length is set to a fixed length. The thumbnail image of the disc title can be arbitrarily given by the user. For example, the thumbnail image data stored in the area of the first entry of the index file may be automatically set. Although the thumbnail image of the AV file can be arbitrarily given by the user, for example, it may be automatically set to be the first image data in the AV file.

  Intro data is typical short-time audio data of a disc title and each AV file, and the data length is set to a fixed length. The intro of the disc title can be arbitrarily given by the user. For example, the intro data stored in the area of the first entry in the index file may be automatically set. The intro of the AV file can be arbitrarily given by the user, but may be automatically set to be audio data for the first few seconds, for example, 5 seconds in the AV file.

  These texts, thumbnail images, and intros are provided with a storage area in the index file as necessary in consideration of the convenience of search. Property data needs to be registered, but even if text, thumbnail image data, and intro data storage areas are secured, all text, thumbnail image, and intro data are not necessarily registered. There is no need to be done.

  FIG. 5 is a diagram showing an example of an index file created using a QuickTime movie file according to the first embodiment.

  In FIG. 5, the index file includes an index atom 201 and an index data atom 202.

  The index data atom 202 contains actual data of basic properties, text, thumbnail images, intros, and extended properties. The basic property, text, thumbnail image, intro, and extended property actual data related to the disc title are accommodated in entry # 0, which is the first area of the index data atom 202, and the basic properties related to each AV file, The actual data of the text, thumbnail image, intro, and extended property are accommodated in entry # 1 to entry #n (n is an integer of 1 or more), which are the second and subsequent areas of the index data atom 202, respectively. .

  Properties that contain attribute information are composed of basic properties that collect fields with a fixed data length and extended properties that collect fields with a variable data length. Therefore, the data length of the basic property is a fixed length, and the data length of the extended property is a variable length.

  The index atom 201 corresponds to the movie header atom 211 and the actual data of the basic property, text, thumbnail image, intro, and extended property, respectively, the track atom (basic property) 212, the track atom (text) 213, and the track. It comprises an atom (thumbnail image) 214, a track atom (intro) 115, and a track atom (extended property). In order to make it possible to distinguish whether the track atom handles fixed-length data or variable-length data, the flag of the sample description atom is used. For example, when the sample description atom flag is 1, the track atom includes fixed-length data, and when the sample description atom flag is 2, the track includes variable-length data. It is an atom. Therefore, the track atom (basic property) 212 and the track atom (extended property) 216 can be easily identified by referring to the flag of the sample description atom. Furthermore, in order to achieve compatibility with the conventional case where the property is not divided, a case of a track atom including fixed-length data and variable-length data is also defined, and the flag of the sample description atom is 3. This is the case.

  As described above, only the track atom (property) 212 and the actual data of the property are essential.

  In the index data atom 202, the storage location of the basic property, text, thumbnail, intro, and extended property of each entry is track atom (basic property) 212, track atom (text) 213, track atom (thumbnail) 214. , Track atom (intro) 215 and track atom (extended property) 216, respectively. For example, in the entry of entry number 0, the position of the basic property is indicated by the first TAP0 of the table obtained by the sample table atom in the track atom (basic property) 212. The position of the text is indicated by the first TAT0 of the table obtained by the sample table atom in the track atom (text) 213. The position of the thumbnail is indicated by the first TAS0 of the table obtained by the sample table atom in the track atom (thumbnail) 214. The position of the intro is indicated by the first TAI0 of the table obtained by the sample table atom in the track atom (intro) 215. The position of the extended property is indicated by the first TAPE0 of the table obtained by the sample table atom in the track atom (extended property) 216. In the present embodiment shown in FIG. Since no extension property is attached to TAPE0, no information indicating the position is stored in TAPE0, and a dummy that does not substantially indicate the position is stored. For example, in the entry of entry number 2, the position of the basic property is indicated by the third TAP2 of the table obtained by the sample table atom in the track atom (basic property) 212. The position of the text is indicated by the third TAT2 of the table obtained by the sample table atom in the track atom (text) 213. The position of the thumbnail is indicated by the third TAS 2 of the table obtained by the sample table atom in the track atom (thumbnail) 214. The position of the intro is indicated by the third TAI2 of the table obtained by the sample table atom in the track atom (intro) 215. The position of the extended property is indicated by the third TAPE 2 of the table obtained by the sample table atom in the track atom (extended property) 216.

  A first entry group that collects entries that store actual data of basic properties, text, thumbnails, and intros has a fixed length, and a second entry group that collects entries that store actual data of extended properties is variable. Become long. For example, in FIG. 5, entry number 0 (entry # 0), entry number 1 (entry # 1), entry number 2 (entry # 2), entry number 3 (entry # 3), entry number 4 (entry # 4) , Entry number 5 (entry # 5), entry number 6 (entry # 6), and entry number 7 (entry # 7) are a fixed-length first entry group, and subsequent entry numbers 2e (entry # 2e) ), Entry number 6e (entry # 6e),... Is a variable length second entry group.

  FIG. 6 is a diagram illustrating an example of a track atom (basic property).

  In FIG. 6, a track atom (basic property) 212 is defined as a chunk related to a disc title and basic property data corresponding to each AV file, AV file basic property TAP0, AV file basic property TAP1, AV file basic property TAP2 ,..., For each of the AV file basic properties TAPn, a table format indicating data lengths L_PR1, L_PR2, L_PR3,. It is said. The data length is, for example, a variable length displayed in units of bytes.

  FIG. 7 is a diagram illustrating an example of actual property data according to the first embodiment.

  FIG. 7A shows basic properties obtained by collecting each field having a fixed data length in the actual property data, and FIG. 7B shows extended properties obtained by collecting each field having a variable data length in the actual property data. Show. FIG. 7B shows a case where the number of fields having a variable data length is one, but a plurality of fields may be used. In addition, a field having a fixed data length may be included in the extended property, but at least a field having a variable data length is included.

  As described above, a property consists of a fixed-length basic property and a variable-length extended property. By dividing the property into a fixed-length part and a variable-length part in this way, the rewrite processing time during editing, etc. Can be shortened.

  In FIG. 7A, the actual data of the basic property includes entry number (entry number), entry property (entry property), folder property (folder property), version (version), flag (flag), data type (data type), production It is composed of a date and time (creation time), an editing date and time (modification time), and a duration, and each data length is a fixed length. In FIG. 7B, the extended property is configured with a file identifier and is variable-length data.

  The entry number is a number starting from 0, and is a unique number assigned to each entry, that is, an identifier for identifying the entry. The entry number indicates in which entry the actual data of the property is stored. The entry number is 4-byte data with the 0th byte as the start byte position. Note that the entry number is not limited to a number, but may be a symbol or a code, as long as it can identify which entry in an index data atom is an entry.

  The entry property is 1-byte data with the fourth byte as the start byte position, and a specific meaning is given to each bit. In this embodiment, the 0th bit of the 8 bits is used to indicate whether the data related to the entry is a folder or actual data. When the 0th bit is 0, the 0th bit indicates a folder. When the 0th bit is 1, it indicates data. The first bit of the 8 bits indicates whether or not an extended property is attached to the basic property related to the entry. If the first bit is 0, it indicates that no extended property is attached. If 1 is 1, it indicates that an extension property is attached. A predetermined meaning is defined in the second to seventh bits. Or it is undefined as a reserve.

  The folder property is the entry number of the folder to which the entry belongs. Here, when the entry contains information on the disc title, this entry is set as “root” which is a folder in the highest hierarchy, and a predetermined identifier indicating this is assigned. As an identifier indicating this route, for example, an entry number 0 itself in which a disc title is accommodated is assigned, a special identifier (eg, “T”, “D”, “M”, etc.) is assigned, or 4 bytes. Since the maximum entry number is considered to be rarely used, the maximum entry number is assigned. In this embodiment, “T” is assigned. Alternatively, it may be defined in advance that there is no folder property of the disc title, and if the entry is a disc title, the program may be created so as not to refer to the folder property. The folder property is 4-byte data with the fifth byte as the start byte position. A folder refers to a mechanism for collecting a plurality of files, and not only files but also other folders can be registered in the folder.

  The version is 1-byte data with the 9th byte as the start byte position. The flag is 2-byte data with the 10th byte as the start byte position. The data type indicates the type of data (moving image, still image, audio, etc.) in the title file or AV file related to the property, and is 1-byte data with the 12th byte as the start byte position. The production date and time indicates the date and time when the AV file related to the property is produced, and is 4-byte data having the 13th byte as the start byte position. The edit date / time indicates the date / time when the AV file related to the property is modified, and is 4-byte data with the 17th byte as the start byte position. The duration indicates the length of time required for the AV file related to the property to be played back, and is 4-byte data with the 21st byte as the start byte position.

  The file identifier indicates the file name of the AV file related to the property, and is variable length data with the 0th byte as the start byte position.

  The index file manages index data in a hierarchical structure based on the above-described entry number, entry property, and folder property.

  Next, a specific example of the relationship between the entry number, the entry property, the folder property, and the hierarchical structure of the index data will be described.

  FIG. 8 is a diagram illustrating an example of property information and index data structure according to the first embodiment. FIG. 8A shows the entry number, the 0th and 1st bits of the entry property, and the folder property, and FIG. 8B shows the structure of the index data.

  In FIG. 8, entry number 0 is a folder because the 0th bit of the entry property is 0, and since the 1st bit of the entry property is 0, no extension property is attached, and the folder property is T. The root of the disc title.

  The entry number 1 is index data because the 0th bit of the entry property is 1, and the extended property is not attached because the 1st bit of the entry property is 0, and the folder property is 0. The entry of 1 belongs to entry number 0, that is, the route.

  The entry number 2 is index data because the 0th bit of the entry property is 1, the extension property is attached because the 1st bit of the entry property is 1, and the folder property is 0, so the entry number 2 The entry No. belongs to entry number 0, that is, the root.

  Here, since the entry number 2 has the entry number 2, the position and size of the data is described in the third TAPE 2 from the top, and by referring to this, the data of the extension property is indexed. You can see where the data atom is stored.

  The entry number 3 is a folder because the 0th bit of the entry property is 0, and the extended property is not attached because the 1st bit of the entry property is 0, and the folder property is 0. The entry belongs to entry number 0, that is, the root.

  From these, the route accommodates an entry with an entry number 1, an entry with an entry number 2, and a folder with an entry number 3.

  The entry number 4 is a folder because the 0th bit of the entry property is 0, the extended property is not attached because the 1st bit of the entry property is 0, and the folder property is 3. The entry belongs to the folder with the entry number 3.

  The entry number 5 is index data because the 0th bit of the entry property is 1, and the extended property is not attached because the 1st bit of the entry property is 0, and the folder property is 3. The entry 5 belongs to the folder with the entry number 3.

  The entry number 6 is index data because the 0th bit of the entry property is 1, the extension property is attached because the 1st bit of the entry property is 1, and the folder property is 4, so the entry number 6 Entry belongs to the folder of entry number 4.

  Here, since the entry number 6 has the entry number 6, the position and size of the data is described in the seventh TAPE 6 from the top, and by referring to this, the data of the extension property is indexed. You can see where the data atom is stored.

  The entry number 7 is index data because the 0th bit of the entry property is 1, and the extended property is not attached because the 1st bit of the entry property is 0, and the folder property is 4. 7 entry belongs to the folder of entry number 4.

  It can be seen that the structure of the index data is the hierarchical structure shown in FIG. 8B from the entry number, the 0th bit of the entry property, and the folder property. From the first bit of the entry property, as shown in FIG. 5, it can be seen that the extended property is attached to the basic property of entry number 2 and the basic property of entry number 6, respectively. On the other hand, as described above, with reference to the track atom (extended property) 216, the extended properties can be stored in the index data atom 202.

  By using the first bit of the entry property, the property can be divided into a basic property that is a fixed-length part and an extended property that is a variable-length part, and whether or not an extended property is attached to the basic property is identified. can do.

  Therefore, as shown in FIG. 5, when the actual data of the basic property, text, thumbnail, intro, and extended property is accommodated in each entry of the index data atom 202, the basic property having a fixed data length, Entries containing actual data of text, thumbnails, and intros can be collected in the index data atom 202 and accommodated as a first entry group, followed by actual data of an extended property whose data length is variable. Can be accommodated as a second entry group.

  For this reason, even when the contents of the file identifier are rewritten by editing or the like and the data length becomes longer than before rewriting, only the rewritten entries after the rewritten entry of the second entry set are rewritten, and the track atom (extended property) is set. Just rewrite it.

  Since the data length of the second entry set is only a part of the property data as shown in FIG. 7, the data length is much shorter than that of the first entry set, and the rewrite processing time is much shorter than when the present invention is not used. Can be shortened.

  Even if the entry properties, folder properties, editing date and time, text, thumbnails, and intros in the basic properties are rewritten, these data lengths are set to a fixed length, so the data length of the first entry group is Is constant.

  In addition, in order to divide the fixed-length first entry group and the variable-length second entry group, the property is divided into a basic property and an extended property. However, as shown in FIG. It is also possible to accommodate the property and the extended property in one entry. (Second Embodiment) In the first embodiment, an extended property is treated as a separate track, and a track atom (extended property) and the first bit of an entry property are used, so that the property is divided into a fixed length portion and a variable length portion. However, in the second embodiment, the property can be divided into a fixed length portion and a variable length portion by using 1 bit of the entry property and the folder property.

  The recording / reproducing apparatus and camera-integrated digital recording / reproducing apparatus in the second embodiment are the same as the recording / reproducing apparatus and camera-integrated digital recording / reproducing apparatus shown in FIGS.

  FIG. 10 is a diagram showing an example of an index file created in the second embodiment using a QuickTime movie file.

  In FIG. 10, the index file includes an index atom 301 and an index data atom 302.

  The index data atom 302 contains actual data of basic properties, text, thumbnail images, intros, and extended properties. The property is divided and accommodated into a basic property of a fixed length part and an extended property of a variable length part.

  The index atom 301 corresponds to the movie header atom 311 and the actual data of the property, text, thumbnail image, and intro, respectively. 314 and a track atom (intro) 315.

  In the index data atom 302, the storage location of the basic property, text, thumbnail, intro, and extended property of each entry is track atom (property) 312, track atom (text) 313, track atom (thumbnail) 314, and Each is represented by a respective sample table atom in the track atom (intro) 315.

  A first entry group that collects entries that store actual data of basic properties, text, thumbnails, and intros has a fixed length, and a second entry group that collects entries that store actual data of extended properties is variable. Become long. For example, in FIG. 10, entry number 0 (entry # 0), entry number 1 (entry # 1), entry number 2 (entry # 2), entry number 3 (entry # 3), entry number 4 (entry # 4) , Entry number 5 (entry # 5), entry number 6 (entry # 6), and entry number 7 (entry # 7) are a fixed-length first entry group, and subsequent entry numbers 8 (entry # 8) ), Entry number 9 (entry # 9),... Is a variable length second entry group.

  FIG. 11 is a diagram illustrating an example of actual property data according to the second embodiment.

  FIG. 11A shows basic properties obtained by collecting each field having a fixed data length in the actual property data, and FIG. 11B shows extended properties obtained by collecting each field having a variable data length in the actual property data. Show. FIG. 11B shows a case where the number of fields having a variable data length is one, but a plurality of fields may be used.

  In FIG. 11A, the actual data of the basic properties are entry number (entry number), entry property (entry property), folder property (folder property), version (version), flag (flag), data type (data type), production It has a date and time (creation time), an editing date and time (modification time), and a duration, and each data length is a fixed length. In FIG. 11B, the extended property includes an entry number, an entry property, a folder property, and a file identifier. The file identifier is variable length data. It is.

  Since the entry number, folder property, version, flag, data type, production date / time, editing date / time, and duration are the same as those in the first embodiment, description thereof is omitted.

  The entry property is 1-byte data with the fourth byte as the start byte position, and a specific meaning is given to each bit. In this embodiment, the 0th bit of the 8 bits is used to indicate whether the data related to the entry is a folder or actual data, as in the first embodiment. When 0, it indicates a folder, and when the 0th bit is 1, it indicates data. The second bit of the 8 bits indicates whether or not the entry contains the actual data of the extended property. If the second bit is 0, it indicates that the entry is not the actual data of the extended property. If 1 is 1, it indicates the actual data of the extended property. A predetermined meaning is defined for each remaining bit. Or it is undefined as a reserve.

  The folder property is an entry number of a folder or data to which the entry belongs.

  The index file manages index data in a hierarchical structure based on the above-described entry number, entry property, and folder property.

  Next, a specific example of the relationship between the entry number, the entry property, the folder property and the hierarchical structure of the index data will be described.

  FIG. 12 is a diagram illustrating an example of property information and index data structure according to the second embodiment. FIG. 12A shows the entry number, the 0th bit and the second bit of the entry property, and the folder property, and FIG. 12B shows the structure of the index data.

  In FIG. 12, entry number 0 is a folder because the 0th bit of the entry property is 0, and since the second bit of the entry property is 0, it does not contain the actual data of the extended property, and the folder property is T. Because it is the root of the disc title.

  The entry number 1 is index data because the 0th bit of the entry property is 1, and the second bit of the entry property is 0, so the actual data of the extended property is not accommodated and the folder property is 0. The entry with the entry number 1 belongs to the entry number 0, that is, the route.

  Entry number 2 is index data because the 0th bit of the entry property is 1, and since the second bit of the entry property is 0, it does not contain the actual data of the extended property and the folder property is 0. , Entry number 2 belongs to entry number 0, that is, the root.

  Entry number 3 is a folder because the 0th bit of the entry property is 0, and since the second bit of the entry property is 0, it does not contain the actual data of the extended property and the folder property is 0. The entry with the number 3 belongs to the entry number 0, that is, the route.

  The entry number 4 is a folder because the 0th bit of the entry property is 0, and since the second bit of the entry property is 0, it does not contain the actual data of the extended property and the folder property is 3. The entry with the number 4 belongs to the entry number 3.

  The entry number 5 is index data because the 0th bit of the entry property is 1, and the actual data of the extended property is not accommodated because the second bit of the entry property is 0, and the folder property is 3. Thus, the entry with the entry number 5 is the index data because the 0th bit of the entry property is 1 and the entry number 6 belonging to the entry number 3 is the extended property because the second bit of the entry property is 0. , And the folder property is 4, the entry with the entry number 6 belongs to the entry number 4.

  The entry number 7 is index data because the 0th bit of the entry property is 1, and since the second bit of the entry property is 0, it does not accommodate the actual data of the extended property and the folder property is 4. Thus, the entry of entry number 7 belongs to entry number 4.

  The entry number 8 is index data because the 0th bit of the entry property is 1, and the actual data of the extended property is accommodated because the second bit of the entry property is 1, and the folder property is 2. , Entry number 7 belongs to entry number 2.

  The entry number 9 is index data because the 0th bit of the entry property is 1, and the actual data of the extended property is accommodated because the second bit of the entry property is 1, and the folder property is 6. , Entry number 9 belongs to entry number 6.

  It can be seen that the structure of the index data is the hierarchical structure shown in FIG. 12B from the entry number, the 0th and 2nd bits of the entry property, and the folder property. From the second bit of the entry property, it can be seen that the entry number 8 and the entry number 9 contain the actual data of the extended property as shown in FIG. Further, it can be seen from these folder properties which entry belongs to the basic property.

  That is, the extended property accommodated in the entry of entry number 8 is a property together with the basic property accommodated in the entry of entry number 2 because the folder property is 2. Since the extension property accommodated in the entry with the entry number 9 has a folder property of 6, it becomes a property together with the basic property accommodated in the entry with the entry number 6.

  By using the second bit of the entry property, the property can be divided into a basic property that is a fixed length portion and an extended property that is a variable length portion. By using the folder property, it is possible to indicate to which basic property the extended property is attached. Therefore, as shown in FIG. 10, when the actual data of the basic property, text, thumbnail, intro, and extended property is accommodated in each entry of the index data atom 302, the basic property having a fixed data length, The entries containing the actual data of text, thumbnails and intros can be accommodated in the index data atom 302 as a first entry group, and subsequently, the actual data of the extended property whose data length is variable Can be accommodated as a second entry group.

  For this reason, even when the contents of the file identifier are rewritten by editing or the like and the data length becomes longer than before rewriting, only the rewritten entries after the rewritten entry of the second entry group are rewritten and the track atom (property) is rewritten. Just do it.

  Since the data length of the second entry group is only a part of the property data as shown in FIG. 7, it is much shorter than the first entry group, and the rewrite processing time is much shorter than when the present invention is not used. Can be shortened.

  Even if the entry properties, folder properties, editing date and time, text, thumbnails, and intros in the basic properties are rewritten, these data lengths are set to a fixed length, so the data length of the first entry group is Is constant.

It is a block diagram which shows the example of 1 structure of a digital recording / reproducing apparatus. It is a schematic diagram which shows the external shape of a camera integrated digital recording / reproducing apparatus. It is a figure which shows one structural example of a QuickTime movie file. It is a figure which shows the example of 1 structure of a video media information atom. It is a figure which shows an example of the index file in 1st Embodiment produced using a QuickTime movie file. It is a figure which shows an example of a track atom (property). It is a figure which shows an example of the actual data of the property in 1st Embodiment. It is a figure which shows an example of the information of the property in 1st Embodiment, and the structure of index data. It is a figure which shows another example of the index file in 1st Embodiment produced using a QuickTime movie file. It is a figure which shows an example of the index file in 2nd Embodiment produced using a QuickTime movie file. It is a figure which shows an example of the actual data of the property in 2nd Embodiment. It is a figure which shows an example of the information of the property in 2nd Embodiment, and the structure of index data.

Explanation of symbols

  11 video encoder, 12 audio encoder, 13 video decoder, 14 audio decoder, 15 file generator, 16 file decoder, 17, 20 memory, 18 memory controller, 19 system control microcomputer, 21 error correction code / decoding , 23 data modulator / demodulator, 24 magnetic field modulation driver, 26 operation unit, 30 servo circuit, 31 motor, 32 magnetic field head, 33 optical pickup, 40 recording medium, 50 camera integrated digital recording / reproducing apparatus, 51 main body, 52 lens unit , 53 sound collecting microphone, 54 display panel, 55 pointing device, 201 index atom, 202 index data atom, 212 track atom (basic property), 216 track atom (Extension property), 312 track atom (property)

Claims (10)

Information for managing a plurality of information related to a file or folder in a hierarchical structure, and among the plurality of information, attribute information indicating the attribute of the file or the folder is limited to a field having a fixed data length. An index file that is information that stores the first attribute information and the second attribute information in association with each other by dividing the first attribute information into the second attribute information including a field having a variable data length ; and Reproducing means for reproducing the file from a recording medium;
An operation input means for receiving an operation input from a user;
Causing the reproduction means to reproduce the plurality of information based on each information indicating the position of the plurality of information in the index file;
Identifying the relevance between the first attribute information and the second attribute information based on predetermined information included in the first attribute information or the second attribute information among the plurality of reproduced information; Based on the relevance, the index data included in the index file is reproduced,
Among the index data included in the displayed index file, there is the second attribute information associated with the first attribute information corresponding to the index data designated according to the operation input from the operation input means. Control means for reproducing a corresponding file based on the first attribute information and the second attribute information ;
A playback device comprising: The control means includes the first attribute information and the second attribute information based on information indicating presence / absence of attachment of the second attribute information included in the first attribute information among the reproduced information. The playback device according to claim 1, wherein a relevance of the playback device is identified . The control means relates to the relevance between the first attribute information and the second attribute information based on the explicit information specifying the hierarchical structure included in the second attribute information among the plurality of reproduced information. The playback device according to claim 1, wherein the playback device is identified . The second attribute information reproducing apparatus according to claim 1 including information for identifying the file or the folder. Wherein the plurality of information reproducing apparatus according to claim 1 comprising an excerpt information of the file or the folder. Wherein the plurality of information reproducing apparatus according to claim 1 including image data associated with the file or the folder. Wherein the plurality of information reproducing apparatus according to claim 1 comprising audio data associated with the file or the folder. Wherein the plurality of information reproducing apparatus according to claim 1 including the text data associated with the file or the folder. A playback device for playing back information recorded on a recording medium ,
Information for managing a plurality of information related to a file or folder in a hierarchical structure, and among the plurality of information, attribute information indicating the attribute of the file or the folder is limited to a field having a fixed data length. The plurality of index files in the index file, which is information that stores the first attribute information and the second attribute information in association with each other by dividing the first attribute information into the second attribute information including a field having a variable data length. Based on each information indicating the position of the information, the plurality of information is reproduced,
Based on predetermined information included in the first attribute information or the second attribute information among the plurality of reproduced information, the relevance between the first attribute information and the second attribute information is identified. , Reproducing the index data contained in the index file from the recording medium,
In response to an operation input from the user, the index data included in the displayed index file is designated as predetermined index data,
When there is the second attribute information associated with the first attribute information corresponding to the predetermined index data designated by the operation input from the user , based on the first attribute information and the second attribute information Step to play the corresponding file
Including playback methods. Information for managing a plurality of information related to a file or folder in a hierarchical structure, and among the plurality of information, attribute information indicating the attribute of the file or the folder is limited to a field having a fixed data length. a first attribute information summarizing the data length is divided into a second attribute information including a field that is a variable length, said in the index file is information for housing in association with the second attribute information and the first attribute information more Based on each piece of information indicating the position of the information, the plurality of pieces of information are reproduced,
Based on predetermined information included in the first attribute information or the second attribute information among the plurality of reproduced information, the relevance between the first attribute information and the second attribute information is identified. , Reproducing the index data included in the index file from the recording medium,
In response to an operation input from the user, the index data included in the displayed index file is designated as predetermined index data,
When there is the second attribute information associated with the first attribute information corresponding to the predetermined index data designated by the operation input from the user , based on the first attribute information and the second attribute information Step to play the corresponding file
A program storage medium in which a program for causing a computer to execute processing including the program is recorded.

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