JP2010267352A - Data tape control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform high-speed retrieval and direct reproduction of an AV file recorded in a linear recording medium such as a data tape. <P>SOLUTION: An AV index 300 is added in addition to a file index 111. The information thereof is specific to the AV file. A thumbnail image file 301 and a proxy video file 302 associated with the AV file are continuously arranged in the AV index file 300, and information on all the AV files recorded in the tape is held in a latest AV index. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a data tape control apparatus for recording an AV file on a linear access medium such as a data tape, and more specifically, an AV file index creation method and information to be recorded, and an AV file operation using them. The present invention relates to a data tape control device.

The data tape control device is a device that records and reads out files handled by a computer on a tape. To record and restore files on tape, it is necessary to define the logical structure of file attribute information such as file name, directory path, creation date, creator, and recording position on the tape and manage it on the tape. is there. The configuration definition is called a tape format. Hereinafter, tape drive control and tape format in the data tape control apparatus will be described.

  Generally, a data tape control device is connected to a computer, reads a plurality of files recorded in a hard disk (HDD) device or the like that is also connected to the computer, and records them on a tape at a time. This unit is called a data set. At the end of the data set, an index that is search information for the files recorded in the unit is created.

  FIG. 1 is a diagram showing the highest level concept of a tape format. As shown in FIG. 1, the tape format includes a tape header 101, a plurality of data sets 102 to 104, and a tape footer 105. FIG. 3 shows an example of items of the tape header 101. FIG. 2 shows a configuration diagram of the data set. The data set includes a data set header 106, a plurality of files 107 to 110, a file index 111, and a data set footer 112.

  FIG. 4 shows a configuration example of the file index 111. Of the file index items shown in FIG. 4, the physical block address and logical block address are used to indicate the physical recording position on the tape. The physical block is a minimum unit for physically reading / writing data from / to the tape when the tape drive is controlled.

  FIG. 7 shows the configuration of a conventional tape drive control apparatus. The tape seek means 406 can designate the position of data on the tape by a physical block. A logical block is a unit obtained by further dividing a physical block, and a recording position is designated by a logical block address. Among the items of the tape header shown in FIG. 3, the physical block size indicates the size of the physical block, and the logical block size indicates the size of the logical block.

  FIG. 5 shows an example of specifying the file recording position. The recording position of the data 115 of the file a can indicate a unique location on the tape using the physical block address 113 of the file a and the logical block address 114 of the file a. Similarly, the recording position of the data 118 of the file b is indicated by the physical block address 116 of the file a and the logical block address 117 of the file b. Next, the index will be described.

  As shown in FIG. 4, the file index holds the file name, directory path, creation date / time, creator, and recording position on the tape. Files can be restored from this information on the computer. In order to check the contents of the file recorded on the data tape, the file is once restored to another medium such as an HDD device and then browsed with browsing computer software corresponding to the file.

  When a conventional data tape control apparatus creates a new data set, the index stores information on files included in the data set. Therefore, in order to acquire information on all files recorded on the data tape, it is necessary to read the indexes of all data sets recorded on the tape.

  Also, in order to play back AV files stored in the form of data files on a linear access medium such as a data tape, it is necessary to restore those files to another medium such as an HDD device. An AV file refers to a file that includes at least video data, and may include audio data and metadata. An AV file may have a large file size due to its nature, and there is a problem that it takes a long time to restore and reproduce data from a linear recording medium such as a data tape. Therefore, a method for recording a thumbnail, which is a representative image of an AV file, in an index has been proposed. For example, Patent Document 1 discloses a configuration in which an AV thumbnail file generated for an AV file in a data set is included in an index in a write-once optical disc.

  For write-once optical discs, which are random access media, when a new data set is created, an index that includes information on the files contained in this data set and previously created data sets is created and recorded. It has been. In this method, every time a data set is created, an index including the data set created in the past is created, so that information is duplicated and the capacity for recording the index increases. In order to solve this problem, Patent Literature 1 proposes a method of holding reference information to file information in an index recorded in a previously created data set in the latest index.

  FIG. 6 shows an index configuration diagram in the conventional apparatus described in Patent Document 1. In FIG. When the data set 207 is added after the data set 200, the index of the data set 207 has the AV thumbnail files 208, 209, 210 recorded thereon, and reference information 211, 212, AV reference information 211, 212, 213 is held. Thereby, by acquiring the index of the data set 207, the recording position of the AV thumbnail file written in the previous data set can be obtained.

International Publication No. 03/079359

  However, the conventional configuration has the following problems when an AV file is recorded on a data tape.

  In order to reproduce AV files stored in the form of data files on a linear access medium such as a data tape, it is necessary to restore those files to another medium such as an HDD device. An AV file may have a large file size due to its nature, and there is a problem that it takes a long time to restore and reproduce data from a linear recording medium such as a data tape.

  Further, in the method of recording the AV thumbnail file in the index as in the conventional apparatus described in Patent Document 1, the content of the AV file can be grasped to some extent by referring to the thumbnail. However, in order to view all thumbnails, it is necessary to read all of the plurality of indexes physically separated from the recording position on the tape based on the reference information, and a tape that is a linear access medium requires a lot of time. There was a problem.

  In view of such problems, the data tape control apparatus of the present invention records all AV files recorded there while recording AV files and data files together on a linear access medium such as a data tape. An object is to provide means for reading out information at high speed.

  In order to solve the above problems, a data tape control device of the present invention controls a tape drive and records at least one recording target file as a recording target data set on a data tape loaded in the tape drive. A data tape control device that controls a tape drive to access a data tape, and creates a recording target data set including a recording target file and an AV index that is information about the AV file of the recording target file A tape format processing unit that creates a new AV index based on information about the AV file included in the recording target file, and a recorded AV index included in the data set recorded on the data tape. New A In combination with the index, a recording target AV index is created and included in the recording target data set, and the tape drive control unit records the recording target AV index before the recording position of the recording target file when the recording target data set is recorded. It is set as the structure recorded on.

  According to the data tape control device of the present invention, the attribute information of all the AV files recorded on the tape is aggregated into the AV index of the latest data set, so that it is recorded on the tape only by reading the latest AV index. Information on all AV files can be acquired, and reading time can be dramatically reduced, while normal file information is recorded in each data set without duplication, minimizing duplication of information. can do.

  In addition, the data tape control device of the present invention makes it possible to perform searches and operations specialized for AV files by using the AV index information.

Configuration diagram of conventional tape Configuration diagram of conventional data set The figure which shows the item example of the conventional tape header The figure which shows the item example of the conventional file index The figure which shows the example of a recording position instruction of the conventional file Index configuration diagram of conventional equipment Configuration diagram of a conventional tape drive controller Tape format configuration diagram in Embodiment 1 The figure which shows the example of AV index item in Embodiment 1 AV index and data arrangement relation diagram in the first embodiment The figure which shows the AV index example of the data set 1 in Embodiment 1. The figure which shows the file index example of the data set 1 in Embodiment 1. The figure which shows the AV index example of the data set 2 in Embodiment 1 The figure which shows the file index example of the data set 2 in Embodiment 1. Configuration diagram of data tape control apparatus according to Embodiment 1 Flowchart of tape format processing apparatus in Embodiment 1 AV table configuration diagram of tape format processing apparatus according to Embodiment 1 Configuration diagram of video reproduction of data tape control device in embodiment 1 The figure which shows the example of a screen of the data operation device in Embodiment 1. FIG. 5 is a diagram showing an example of a screen of the data display device in the first embodiment A diagram showing a configuration example of an AV file

  Hereinafter, embodiments will be described with reference to the drawings.

(Embodiment 1)
FIG. 15 is a block diagram showing a configuration relating to recording in the data tape control apparatus of the present embodiment. FIG. 16 is a flowchart showing the flow of processing when a data set is recorded on a tape. FIG. 17 is an AV table configuration diagram of the tape format processing apparatus, and is used as a temporary internal index in the tape format creation process. FIG. 18 is a block diagram showing a configuration at the time of video reproduction in the system configuration of the data tape control device of the present embodiment. FIG. 19 shows an example of a screen for operating the data tape control device. FIG. 20 shows an example of a screen for playing back video.

  The data tape control apparatus according to the present embodiment includes a tape format processing unit 500, a tape drive control unit 405, and a data storage medium control unit 400 as a configuration relating to recording. The tape format processing unit 500 holds information related to the tape format for writing the AV file and the data file to the data tape, and analyzes the data read from the data tape according to the tape format. Also, the data to be recorded is converted according to the tape format. The data storage medium control unit 400 reads / writes the data storage medium 401. The tape drive control unit 405 reads and writes data tape 403 and data tape memory 404. The tape seek means 406 seeks the data tape to the designated physical block position. The buffer device 407 is a temporary storage area for absorbing a difference in physical read / write speed between the tape format processing unit 500 and the data tape, and temporarily stores data read from the data tape at the time of data reading. In addition, data to be written at the time of data writing is temporarily stored.

  Hereinafter, these configurations and processes will be described. First, the tape format handled by the data tape device of the present invention will be described.

  FIG. 8 is a diagram showing a configuration example of a data set employed in the data tarp control apparatus of the present invention. The data set is arranged in the order of the AV index 300, the thumbnail image file group 301, the proxy video file group 302, the AV files 303 to 305, the files 107 to 108, and the file index 111 after the data set header 106, and finally the data It consists of a set footer 112.

  FIG. 9 is a diagram showing in detail the items of the AV index 300 recorded in the data set shown in FIG. The video clip name of ID1 indicates the name of the AV file. The video file name of ID2 indicates a file path in the data storage medium 401 of the AV file. The main body video file-physical block address of ID3 indicates the physical block address in the data tape 403 of the AV file. The ID4 main body video file-logical block address indicates a logical block address in the data tape 403 of the AV file.

  The thumbnail image file name of ID5 indicates the file path of the thumbnail image file indicating the contents of the AV file. The thumbnail image file-physical block address of ID6 indicates the physical block address on the data tape 403 of the thumbnail image file. The thumbnail image file-logical block address of ID7 indicates the logical block address on the data tape 403 of the thumbnail image file.

  The proxy video file name of ID8 indicates the file path in the data storage medium 401 of the proxy video file indicating the contents of the AV file. The proxy video file-physical block address of ID9 indicates a physical block address in the data tape 403 of the proxy video file. The proxy video file-logical block address of ID10 indicates a logical block address in the data tape 403 of the proxy video file.

  The ID 11 video codec indicates video codec information of the AV file. The audio codec of ID12 indicates the audio codec information of the AV file. The number of audio channels of ID13 indicates the number of audio channels of the AV file. The start time code of ID14 indicates the start time code of the AV file. The video length of ID15 indicates the playback time of the video of the AV file. The editing unit of ID16 indicates the data length of one frame of the AV file.

  From the start time code and the editing unit, the relative position from the beginning of the AV file specified by an arbitrary time code can be determined. Also, the absolute position on the data tape can be determined by using the physical block address and the logical block address of the AV file together.

  The AV index 300 holds a physical block address and a logical block address for specifying the recording position of the AV file, thumbnail image file, and proxy video file on the data tape 403. Further, in order to calculate the recording position on the data tape 403, it has a video codec, an audio codec, the number of audio channels, an editing unit, a start time code, and a video length.

  FIG. 10 is a diagram showing the relationship between the AV index, the file index, and the data arrangement when there are a plurality of data sets shown in FIG. 8 on the tape. Assume that a data set 315 and a data set 316 are recorded in order on the data tape 403. That is, the data set 316 is the latest data set. The AV index 306 of the data set 316 holds information on the AV files 303 to 305 included in the data set 315. The thumbnail image file group 313 of the data set 316 includes the thumbnail image files included in the thumbnail image file group 301, that is, the AV files 303 to 305 included in the data set 315, in addition to the thumbnail image files of the AV files 307 to 309. Keep duplicate thumbnail image files. Further, in the proxy video file group 314 of the data set 316, in addition to the proxy video files of the AV files 307 to 309, the proxy video files included in the proxy video file group 302, that is, the AV files 303 to 305 included in the data set 315 are included. Duplicate proxy video files.

  The file index 111 holds information of all files recorded in the data set 315, that is, AV files 303 to 305 and data files 107 to 108. On the other hand, the file index 312 holds information of all files recorded in the data set 316, that is, AV files 307 to 309 and data files 310 to 311.

  FIG. 11 is a diagram showing the contents of the AV index 300 of the data set 315. The structure of the AV index is simplified for the sake of explanation, and only the video file name, main body video file physical block address, thumbnail image file physical block address, and proxy video file physical block address are shown. The AV index 300 holds physical block addresses of the AV file 303, the AV file 304, and the AV file 305. The AV index 300 also holds physical block addresses of the thumbnail image file group 301 and the proxy video file group 302. The thumbnail image file group 301 and the proxy video file group 302 have respective thumbnail image files and proxy video files of the AV file 303, the AV file 304, and the AV file 305. The file names (video file names) and video clip names of the AV files 303 to 305 are AV-001, AV-002, and AV-003, respectively.

  FIG. 12 is a diagram showing the contents of the file index 111 of the data set 315. The structure of the file index is simplified for explanation, and only the file name and physical block address are shown. The file index 111 holds the physical block addresses of the AV file 303, AV file 304, AV file 305, data file 107, and data file 108 recorded in the data set 315.

  FIG. 13 is a diagram showing the contents of the AV index 306 of the data set 316. The structure of the AV index is simplified for the sake of explanation, and only the video file name, main body video file physical block address, thumbnail image file physical block address, and proxy video file physical block address are shown. The AV index 306 holds the physical block addresses of the AV file 303, AV file 304, AV file 305, AV file 307, AV file 308, and AV file 309. The AV index 306 also holds physical block addresses of the thumbnail image file group 313 and the proxy video file group 314 recorded in the data set 316. The thumbnail image file group 313 and the proxy video file group 314 have respective thumbnail image files and proxy video files of the AV file 303, the AV file 304, the AV file 305, the AV file 307, the AV file 308, and the AV file 309. Note that the file names (video file names) and video clip names of the AV files 307 to 309 are AV-004, AV-005, and AV-006, respectively. As can be seen from FIGS. 11 and 13, the AV files 303 to 305 included in the data set 315 are also included in the AV index 306 of the data set 316. For the AV files 303 to 305, the same address is described as the main body video file physical block address.

  FIG. 14 is a diagram showing the contents of the file index 312 of the data set 316. The structure of the file index is simplified for explanation, and only the file name and physical block address are shown. The file index 312 holds the physical block addresses of the AV file 307, AV file 308, AV file 309, file 310, and file 311 recorded in the data set 316.

  FIG. 21 is a structural example of an AV file. In the AV file, a file header 950 for storing AV file information such as codec type, the number of frames, the number of audio channels, and the like is arranged at the head, followed by a plurality of frames. The first frame data 951, the second frame data 952, and the last frame data 953 are arranged finally. In the example, the audio data has two channels, and the first frame data is composed of a first frame video, a first frame audio channel 1 and a first frame audio channel 2. Subsequent frames are similarly composed of video and audio data.

  Next, the tape address calculation unit 501 will be described. The tape address calculation means 501 calculates the recording position of the AV file on the tape. In the data tape control device of the present invention, when an AV file and a time code are designated, a physical block address and a logical block address on the tape at which the head of the frame data of the video indicated by the time code is recorded in the AV file are determined. Can be acquired. From the AV index item shown in FIG. 9, the physical block address and logical block address at the beginning of the AV file can be acquired. A value obtained by adding the size of the file header 950 arranged at the head of the AV file to this is the recording position of the first frame. The number of frames can be calculated by subtracting the start time code from the specified time code, and the offset value from the first frame can be calculated by multiplying this by the editing unit. By adding the offset value to the previously calculated recording position of the first frame, the physical block address and logical block address indicating the recording position of the frame indicated by the arbitrary time code of the AV file can be determined.

  Next, the tape format processing unit 500 will be described. The tape format processing unit 500 includes a file index creating unit 505 that creates a file index, a file index data holding unit 502 that temporarily stores the file index, an AV index creating unit 506 that creates an AV index, and the latest written to the tape. AV index data holding means 503 for temporarily storing the AV index, thumbnail image file group, and proxy video file group of the data set, and new AV index holding means 504 for storing the index of the AV file to be newly written on the data tape. A tape address calculation means 501 for calculating a physical block address and a logical block address for writing a file on the tape, an AV table 507 for managing AV file information, an AV table And a AV table counter 508 for managing the number of AV files stored in the table.

  The AV index creation means 506 will be described. The AV index, thumbnail image file group, and proxy video file group of the latest data set on the tape are read into the AV index data holding unit 503, and the AV index of the AV file to be newly written on the data tape is the new AV index holding unit 504. After that, the AV index of the new AV index data holding unit 504 is added to the AV index of the AV index data holding unit 503, and is written on the data tape as the latest AV index. Subsequently, the thumbnail image file group of the AV index data holding unit 503 is written on the data tape, and then the thumbnail image file group of the new AV index is written on the data tape. Subsequently, the proxy video file group of the AV index data holding means 503 is written to the data tape, and then the new AV index proxy video file group is written to the data tape.

  Processing for writing an AV file and a data file on the data tape will be described in detail with reference to FIG.

  First, a process for recording the first data set 315 on an unrecorded data tape will be described.

  First, the stored contents of the file index data holding means 502, AV index data holding means 503, and new AV index holding means 504 are erased, and the AV table counter is set to zero.

  Subsequently, in order to create an AV index, a process for associating a thumbnail image file and a proxy video file for each AV file is performed. This process is executed for all selected files. The data storage medium control unit 400 reads the file from the data storage medium 401, analyzes the contents of the file, and determines whether the file is an AV file or a data file (S104). If it is an AV file, the directory path and file size are added to the AV table 507 (S105), and the AV table counter 508 is incremented (S106). Subsequently, the corresponding thumbnail image file is read from the data storage medium 401, and the directory path and file size of the thumbnail image on the data storage medium 401 are added to the AV table 507 (S110). If the thumbnail image file does not exist in the storage medium 401, it is created from the AV file (S109). Subsequently, the corresponding proxy video file is read from the data storage medium 401, and the directory path and file size of the proxy video file are added to the AV table 507 (S114). If the proxy video file is not in the storage medium 401, it is created from the AV file (S113). Hereinafter, the processing shown in S103 to S115 is referred to as AV file association processing.

  Subsequently, an AV index is created. Data is sequentially extracted from the AV table 507, and the tape address calculation means 501 calculates the values of the physical block address and logical block address on the tape of the thumbnail image file (S302), proxy video file (S402), and AV file (S502). Then, each is added to the AV table 507 (S303) (S403) (S503). Subsequently, the information of the AV table 507 is added to the AV index data holding unit 503 to create a new AV index data holding unit 504 (S601). Hereinafter, the processing indicated by S301 to S601 is referred to as AV index creation processing.

  Subsequently, the file index creation unit 505 writes the AV file and the data file to the data tape 403 while creating the file index in the file index holding unit 502. First, the data set header 106 is created and written to the data tape 403 (S602). The data set header 106 holds the name of the data set 315, the date and time of creation, the name of the created user, the time zone, and the like, and is used for identifying backup information of AV files and data files recorded therein. Subsequently, the AV index data 300 is created from the new AV index data holding means 504 and written to the data tape 403 (S603). Subsequently, the thumbnail image file group 301 is written on the data tape 403 (S604 to S607). Subsequently, the proxy video file group 302 is written to the data tape 403 (S701 to S704). Subsequently, the AV files 303 to 305 are written to the data tape 403 while adding index information to the file index holding means 502 (S801 to S804). Subsequently, the data files 107 to 108 are written to the data tape 403 while adding index information to the file index holding means 502 (S901 to S904). Subsequently, the file index 111 is created from the file index holding means 502 and written to the data tape 403 (S905). Subsequently, the data set footer 112 is created and written to the data tape 403 (S906). Thus, the data set 315 is completed.

  Further, the physical block address and logical block address at which the AV index 300 is written are written into the data tape memory 404, and the physical block address and logical block address at which the file index 111 is written are written.

  Next, processing when the data set 316 is recorded following the data set 315 will be described.

  First, the stored contents of the file index data holding means 502, AV index data holding means 503, and new AV index holding means 504 are erased, and the AV table counter is set to zero.

  First, the physical block address and logical block address of the latest AV index recorded in the data tape memory 404 are read from the data tape (S101), and the tape is sought at these positions. The AV index 300, the thumbnail image file group 301, and the proxy video file group 302 are read from the tape to the AV index data holding unit 503. Subsequently, the physical block address and logical block address of the file index recorded in the data tape memory 404 are read, and the tape is sought at these positions. The file index 111 is read into the file index data holding unit 502.

  Subsequently, the thumbnail image file and the proxy video file are associated for each AV file by the AV file association process described above.

  Subsequently, the AV index data relating to the AV file included in the data set 316 is created on the new AV index data holding unit 504 by the AV index creation process described above.

  Subsequently, the file index creating unit 505 writes the AV file and the data file to the data tape 403 while creating the file index on the file index holding unit 502. First, a data set header 317 is created and written to the data tape 403 (S602). Subsequently, the AV index of the data set 315 is taken out from the AV index holding means 503, and new AV index data holding means 504 is added to it to create AV index data 306 and write it to the data tape 403 (S603). Subsequently, the thumbnail image file group of the data set 315 is extracted from the AV index holding unit 503, the thumbnail image file group 313 is added to the thumbnail image file group, and written to the data tape 403 (S604 to S607). Subsequently, the proxy video file group is extracted from the AV index holding means 503 of the data set 315, and the proxy video file group 314 is added to the proxy video file group 314 and written to the data tape 403 (S701 to S704). Subsequently, the AV files 307 to 309 are written to the data tape 403 while adding index information to the file index holding means 502 (S801 to S804). Subsequently, the data files 311 to 312 are written to the data tape 403 while adding index information to the file index holding means 502 (S901 to S904). Subsequently, a file index 312 is created from the file index holding means 502 and written to the data tape 403 (S905). Subsequently, a data set footer 318 is created and written to the data tape 403 (S906). This completes the data set 316.

  Further, the physical block address and logical block address at which the AV index 306 is written are written into the data tape memory 404, and the physical block address and logical block address at which the file index 312 is written are written.

  By recording the data set 316 as described above, the thumbnail image file group 313 holds the thumbnail image files of the AV files 303 to 305 of the data set 315 and the AV files 307 to 310 of the data set 316, and proxy video The file group 314 holds the AV files 303 to 305 of the data set 315 and the proxy video files of the AV files 307 to 310 of the data set 316, and the AV index 306 includes the AV files 303 to 305 of the data set 315 and the data set 316. The AV file information of the AV files 307 to 310 can be held.

  Next, a method for acquiring the recording position of the AV file from the data tape will be described. An example will be described in which the AV file 304 recorded in the data set 315 illustrated in FIG. 10 is selected from the operation screen using the latest AV index 306 of the data set 316 and the recording position is acquired.

  FIG. 18 is a diagram showing a configuration relating to video reproduction of the data tape control device of the present invention. Constituent elements common to those shown in FIG. 15 are given the same reference numerals. The data tape control apparatus according to the present embodiment includes an operation unit 600, a playback unit 603, a data tape playback control processing unit 602, and a tape drive control unit 405 as a configuration relating to playback. The data tape reproduction control processing unit 602 reads the video data of the AV file from the data tape.

  The operation unit 600 includes file selection means 601. The file selection unit 601 includes, for example, a touch panel type display unit, displays a file list screen as shown in FIG. 19, and selects a file by a user operation input. The playback unit 603 includes AV data separation means 604, video playback means 605, audio playback means 606, and video / audio display means 607. The AV data separation unit 604 separates video and audio data collected in units of one frame in the AV file configuration shown in FIG. 21, and the video data is sent to the video playback unit 605 and the audio data is sent to the audio playback unit 606. The video reproduction means 605 converts the video data into a reproducible format, and the audio reproduction means 606 converts the audio data into a reproducible format. The video / audio display unit 607 receives video and audio data from the video reproduction unit 605 and the audio reproduction unit 606, respectively, and configures and outputs the screen as shown in FIG.

  Hereinafter, a process from reading an AV file from the data tape to outputting it to the video / audio display means 607 will be described.

  When a data tape is set, the data tape reproduction control processing unit 602 first reads the data tape memory 404 and acquires the physical block address and logical block address where the latest AV index is written. The tape can be directly sought at these positions, and the latest AV index can be read out. First, the latest AV index 306 is read from the data tape 403 into the AV index data holding unit 503. From the AV index items shown in FIG. 9, the video clip name, video length, start time code, physical block address and logical address of the thumbnail image file, and physical block address and logical address of the proxy video file can be acquired. Here, as shown in FIG. 10, the thumbnail image file group 313 and the proxy video file group 314 are arranged immediately after the AV index 306, and subsequently the thumbnail image file group 313 and the proxy video file group 314 are acquired. Can do.

  FIG. 19 shows a screen example in which these are displayed as a list. In this example, information about AV files 303 to 305 included in the data set 315 read based on the AV index 306 is displayed. When the user wants to select the AV file 304 whose video clip name is AV-002, the AV file whose video clip name is AV-002 is found from the video clip name column in the selection screen displayed on the display unit. You can choose. If the AV file 304 whose video clip name is AV-002 is selected by the file selection means 601, it can be seen from the contents of the AV index data holding means 503 shown in FIG. 13 that the physical block address of the AV file 304 is 235. Although omitted in FIG. 13, the logical block address can be obtained in the same manner. Hereinafter, this process is referred to as an address acquisition process.

  If the operation after selection is playback of an AV file, the tape drive control unit 405 seeks the data tape to the physical block address acquired in the address acquisition process, and starts from the recording position 235 of the AV file 304 on the data tape 403. Data is read into the buffer device 407.

  Subsequently, the editing unit of the AV file 304 is acquired from the AV index data holding unit 503. The data tape reproduction control processing unit 602 transfers data from the buffer device 407 to the AV data separation unit 604 for each editing unit. The tape drive control unit 405 reads data from the data tape to the buffer device 407 as needed. The AV data separation means 604 separates one frame of data, which is an editing unit, into video data and audio data, passes the video data to the video reproduction means 605, and delivers the audio data to the audio reproduction means 606, and the video / audio display means 607. Thus, the video / audio data is configured and output on a screen as shown in FIG.

  On the other hand, when the operation after the selection is restoration of the AV file, the tape drive control unit 405 seeks the data tape to the physical block address acquired in the address acquisition process, and the recording position of the AV file 304 on the data tape 403 Data is read from the buffer device 407 to the buffer device 407. The data tape reproduction control processing unit 602 sequentially retrieves data from the buffer device 407 and writes it in a data storage medium in the form of a file.

  Note that the AV index item example illustrated in FIG. 9 may include a photographer name, a shooting location, a shooting date, and GPS information indicating the coordinates of the shooting location, that is, latitude, longitude, and altitude.

  In the present embodiment, a data tape has been described as a copy destination recording medium. This is because a data tape that is a sequential access medium takes a long time to seek to a specified address, and therefore, if the present invention is applied, there is a remarkable effect. However, the same effect can be obtained with a write-once recording medium.

(Embodiment 2)
In the data tape control device of the first embodiment, a video start time code determination button and an end time code determination button are added to the display screen shown in FIG. While reproducing the AV file from the data tape, the start time code is held by the start time code determination button, and the end time code is similarly held. In the subsequent restoration operation, only data in the range of the start time code and the end time code can be restored to the storage medium as a file.

  As described above, according to the data tape control device of the present embodiment, information and recording positions specialized for all AV file videos recorded on a write-once linear recording medium such as a tape are updated with the latest data. By aggregating the set into the AV index, it is possible to read the AV file information recorded on the tape at high speed. AV files have a larger file size than text data and document data. Therefore, the number of AV file information items to be recorded in the AV index is reduced, and even if a new data set holds the AV index information of all previous data sets, the waste can be reduced.

  Moreover, by recording information specific to the video in the AV index, information specific to the AV file, that is, the photographer, the shooting date, the shooting location, the playback time, and the start, without using an external database or the like It is possible to search by analogizing the contents of the AV file from the time code or the like. Furthermore, by using the AV index information, it is possible to perform operations such as video playback directly from the data tape without going through another medium, or cutting out only a part of the AV file and restoring it to another medium.

  The data tape control apparatus of the present invention can realize high-speed index search and streaming video reproduction while recording an AV file on a write-once linear recording medium such as a tape, and manages a large amount of AV files. It can be applied to a system for archiving AV assets such as necessary broadcasting stations.

100 tape 101 tape header 102 data set 1
103 Data set 2
104 Data set N
105 Tape footer 106 Data set header 107 Data file 1
108 Data file 2
109 Data file 3
110 Data file 4
111 File Index 112 Data Set Footer 113 File 1 Physical Block Address 114 File 1 Logical Block Address 115 File 1 Data 116 File 2 Physical Block Address 117 File 2 Logical Block Address 118 File 2 Data 200 Data Set 1
207 Data Set 2
208 AV files 4
209 AV file 5
210 AV file 6
211 AV thumbnail address 1
212 AV thumbnail address 2
213 AV thumbnail address 3
300 AV index 301 Thumbnail image file group 302 Proxy video file group 303 AV file 1
304 AV file 2
305 AV file 3
306 AV index 307 AV file 4
308 AV file 5
309 AV file 6
310 Data file 5
311 Data file 6
313 Thumbnail image file group 314 Proxy video file group 315 Data set 1
316 Data set 2
400 Data storage medium control unit 401 Data storage medium 402 Tape drive 403 Data tape 404 Data tape memory 405 Tape drive control unit 406 Tape seek unit 407 Buffer device 500 Tape format processing unit 501 Tape address calculation unit 502 File index data holding unit 503 AV Index data holding means 504 New AV index data holding means 505 File index creation means 506 AV index creation means 507 AV table 508 AV table counter 600 Operation section 601 File selection means 602 Data tape playback control processing section 603 Playback section 604 AV data separation means 605 Video playback means 606 Audio playback means 607 Video / audio display means 800 Video playback Frequency 950 file header 951 the first frame data 952 2-th frame data 953 the final frame data

Claims (7)

A data tape control device that controls a tape drive and records at least one recording target file together as a recording target data set for a data tape loaded in the tape drive,
A tape drive controller that controls the tape drive to access the data tape;
A tape format processing unit that creates a recording target data set including an AV index that is information relating to an AV file among the recording target file and the recording target file;
With
The tape format processing unit creates a new AV index based on information about the AV file included in the recording target file, and uses the recorded AV index included in the data set recorded on the data tape as the new AV index. Create a recording target AV index in combination and include it in the recording target data set,
The tape drive control unit records the recording target AV index on the data tape before the recording position of the recording target file when recording the recording target data set;
Data tape controller. The tape format processing unit reads a recorded AV index included in the latest data set recorded on the data tape, creates a recording target AV index by combining the recorded AV index and the new AV index, and Included in the data set to be recorded,
The data tape control device according to claim 1. 2. The data tape control device according to claim 1, wherein the AV index includes a recording position, video playback time, editing unit, and start time code of the AV file on the data tape. The data tape control device according to claim 1, wherein the AV index includes at least one of a thumbnail image of the AV file and proxy video data having a resolution lower than that of the AV file. 2. The data tape control device according to claim 1, wherein the AV index includes at least one of a photographer name, a shooting place name, shooting place position information, and a shooting date of a video included in the AV file. A data tape playback control processing unit that reads an AV index from the data tape and reads a playback target AV file from the data tape based on the video playback time, the editing unit, and the start time code included in the AV index;
A playback unit for playing back the playback target AV file;
A data tape control device according to claim 3. A data recording method for recording data on a write-once medium,
When adding additional data to the media on which recorded data is recorded,
Adding index information relating only to data of a predetermined type included in the recorded data and index information relating to all data included in the additional data to the medium together with the additional data;
Data recording method.

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