JP2011160410A - Recording device and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, even if backed-up video data are confirmed or a part thereof is used, all of the video data must be restored by using backed-up units. <P>SOLUTION: A back-up device 100 includes: a first recording medium control part for controlling access to a back-up source recording medium 110 in which at least one video file 120 including video data and at least one audio file 130 including audio data are recorded; and a second recording medium control part for controlling access to a back-up destination recording medium 150 for backing up data on the back-up source recording medium 110 where the video data and the audio data in the same period are sequentially read on a predetermined time interval basis through the first recording medium control part, and the read video data and audio data are collectively recorded in the back-up destination recording medium 150 through the second recording medium control part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a recording apparatus and a recording method for backing up video files and audio files recorded on a recording medium such as a semiconductor memory card to another recording medium such as a magnetic tape.

  Increasingly, commercial cameras used in broadcasting stations use small, easy-to-handle semiconductor memory cards as recording media for recording captured video data and the like. However, a semiconductor memory card has a higher unit price per recording capacity than a recording medium such as a tape. Therefore, when storing the captured video data, the video data recorded on the semiconductor memory card is backed up to a digital tape or the like.

  As a method of archiving video data, for example, there is a technique disclosed in Patent Document 1. Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for providing metadata that is reminiscent of the content of video data when archiving essences of captured video data and the like. As a result, the archive operation can be automated.

JP 2001-298699 A

  However, conventionally, when video data is backed up to a tape, the backup device combines the video data into one file and stores them in backup units. When restoring the video data, the backup device retrieves a necessary file after restoring it as a file in the backed up unit. Therefore, the backup device has a problem that a large-capacity primary storage medium such as a hard disk is required to restore video data. In addition, the backup device has a problem that it is necessary to restore all of the backed up video data even if the backed up video data is confirmed or partly used.

  In order to solve the above-described problem, a recording apparatus controls a first access to a first recording medium on which at least one video file including video data and at least one audio file including audio data are recorded. Via a recording medium control unit, a second recording medium control unit that controls access to a second recording medium that backs up data on the first recording medium, and the first recording medium control unit, Video data and audio data at the same time are sequentially read out at predetermined time intervals, and the read video data and audio data are collected and recorded on the second recording medium via the second recording medium control unit. A recording control unit.

  With the above configuration, even when the contents of video data and audio data backed up on the second recording medium are checked or only a part is used, the data to be read can be reduced, and the data restoration time can be shortened. .

1 is a block diagram showing a system configuration of a backup device according to Embodiment 1 FIG. 2 is a block diagram showing a configuration of a backup device according to the first embodiment. The figure which shows the data structure of the file preserve | saved at the backup source recording medium in Embodiment 1 The figure which shows the data structure of the file preserve | saved at the backup destination recording medium in Embodiment 1 The figure which shows the structure of the clip in Embodiment 1. FIG. Flowchart showing backup operation in the first embodiment Flowchart showing video / audio file conversion operation in the first embodiment Flowchart showing content package processing operation in the first embodiment

(1. Configuration)
(1-1. System configuration of backup device)
FIG. 1 shows the system configuration of the backup apparatus. The backup device 100 backs up the video file 120 and the audio file 130 recorded on the back backup source recording medium 110 to the backup destination recording medium 150. As the backup source recording medium 110, a randomly accessible semiconductor memory, a hard disk, or the like is used. As the backup destination recording medium 150, a magnetic tape that performs sequential access, an optical disk that can be accessed randomly but takes time to seek, and the like are used.

  The backup source recording medium 110 stores a plurality of video files 120 and a plurality of audio files 130. The video file 120 and the audio file 130 are associated with each other by various methods. As a method of association, the same file name, saving in the same folder, having the same identification information in the file, or having a separate association file are used. The backup destination recording medium 150 stores a plurality of video / audio files 160 and a plurality of additional data files 170 for backup.

(1-2. Configuration of backup device)
FIG. 2 is a block diagram illustrating a configuration of the backup device according to the first embodiment. In the first embodiment, a computer is operated as a backup device by executing a program for realizing the backup device on the computer.

  In FIG. 2, a CPU 201 is a system control unit and controls the entire backup device 100. The ROM 202 is a memory that stores a program that implements a backup device that operates on the CPU 201. The CPU 201 reads a program stored in the ROM 202 and operates the read program. The ROM 202 stores other control programs and various fixed data. The RAM 203 is configured by SRAM, DRAM, and the like, and is a memory for storing program control variables and the like. Various setting parameters and various work buffers are also stored in the RAM 203.

  The operation unit 204 includes a keyboard, a mouse, a touch panel, and the like, and is an instruction input device for an operator to perform various input operations. The display unit 205 is a display device that displays various types of information including images.

  The first recording medium control unit 206 is a control unit that controls reading of various types of information including video data recorded on the first recording medium 110 and writing of information to the first recording medium 110.

  The second recording medium control unit 207 is a control unit that controls writing of various types of information including video data to the second recording medium 150 and reading of information recorded on the second recording medium 150.

(1-3. Data structure in backup source recording medium)
FIG. 3 shows the data structure of the video file 120 and the audio file 130 stored in the backup source recording medium 110.

  FIG. 3A shows the data structure of the video file 120 stored in the backup source recording medium 110. The video file 120 includes a header partition 310, header metadata 320, a video essence 330, and a footer partition 340. The header partition 310 is data arranged at the head of a file defined by SMPTE (the Society of Motion Picture and Television Engineers) 377M. The header partition 310 stores position information in the file, video data format identification information, and the like. The header metadata 320 stores video metadata related to video data. As the video metadata, the angle of view, aspect ratio, data size, etc. of the video data are stored. The video essence 330 is a video data body. The footer partition 340 is data to be arranged in the last partition defined by SMPTE377M. The footer partition 340 stores the same type of information as the header partition 310, but the reference position is different when indicating the position information in the file.

  FIG. 3B shows the data structure of the audio file 130 stored in the backup source recording medium 110. The backup source recording medium 110 stores audio files 130 corresponding to the number of audio channels. The audio file 130 includes a header partition 311, header metadata 321, an audio essence CH 331, and a footer partition 341. The header partition 311 is the same type of information as the header partition 310 and stores contents corresponding to audio data. The header metadata 321 stores audio metadata related to audio data. As audio metadata, a sampling frequency, a data size, and the like of the audio data are stored. The audio essence CH331 is an audio data body for each audio channel. The footer partition 341 is data to be arranged in the last partition specified by SMPTE377M. The footer partition 341 stores the same type of information as the header partition 311, but the reference position is different in pointing the position information in the file.

(1-4. Data structure in backup destination recording medium)
FIG. 4 shows the data structure of the video / audio file 160 and the additional data file 170 stored in the backup destination recording medium 150. As the additional data file 170, there are a video additional data file and an audio additional data file.

  FIG. 4A shows the data structure of the video / audio file 160 stored in the backup destination recording medium 150. The video / audio file 160 includes a header partition 410, header metadata 420, a plurality of content packages 430, and a footer partition 440. The header partition 410 is data to be placed at the beginning of a file defined by SMPTE377M. The header partition 410 is the same type of information as the header partition 310 and the header partition 311 and stores information corresponding to the contents of the content package 430. The header metadata 420 stores video / audio metadata related to video data and audio data stored in the content package 430. As the video / audio metadata, the angle of view, aspect ratio, data size of video data, sampling frequency of audio data, data size, and the like are stored. The content package 430 is a main body of video data and audio data obtained by extracting video data in the video file 120 and audio data in the audio file 130 in units of a predetermined time. The content package 430 arranges a video essence (frame) 431 and an audio essence CH (frame) 432 described later in time series. The footer partition 440 is data arranged in the last partition defined by SMPTE377M. The footer partition 440 stores the same type of information as the header partition 410, but differs in the reference position for indicating the position information in the file.

  FIG. 4B shows the data structure of the video additional data file 470 stored in the backup destination recording medium 150. The video additional data file 470 includes a header partition 450, header metadata 451, and a footer partition 452. In the header partition 450, header metadata 451, and footer partition 452, the header partition 310, header metadata 320, and footer partition 340 of the video file 120 recorded on the backup source recording medium 110 are stored as they are.

  FIG. 4C shows the data structure of the audio additional data file 480 stored in the backup destination recording medium 150. The audio additional data file 480 includes a header partition 460, header metadata 461, and a footer partition 462. In the header partition 460, header metadata 461, and footer partition 462, the header partition 311, header metadata 321 and footer partition 341 of the audio file 130 recorded in the backup source recording medium 110 are stored as they are.

  FIG. 4D shows the data structure of the content package 430 constituting the video / audio file 160. The content package 430 includes a plurality of video essences (frames) 431 and a plurality of audio essences CH (frames) 432. The video essence (frame) 431 is data obtained by dividing the video essence 330 in units of frames. The audio essence CH (frame) 432 is data obtained by dividing the audio essence 331 in units of frames. The audio essence CH (frame) 432 stores audio essence CH (frame) for the audio channel. In the content package 430, the video essence (frame) 431 and the audio essence CH (frame) 432 corresponding to the number of channels are stored for the number of frames of the video data stored in the video file 120 of the backup source recording medium 110. Following the video essence (frame) 431 for one frame and the audio essence CH (frame) 432 for the number of channels, the video essence (frame) 431 for the next frame and the audio essence CH (frame) 432 for the number of channels are stored. .

  FIG. 5 shows the configuration of the clip 500. A clip is a group of video files and corresponding audio files. The clip 500 includes a video file 510 and audio files 520 with several audio channels.

(2. Operation)
(2-1. Operation of backup device)
FIG. 6 is a flowchart showing an operation when the backup device backs up the video file 120 and the audio file 130 of the backup source recording medium 110 to the backup destination recording medium 150.

  The backup device 100 performs a backup operation by an operator specifying a video file 120 and an audio file 130 that constitute a backup target clip in the backup source recording medium 110 using the operation unit 204 and performing a backup start operation. Start. The backup device 100 also monitors the recording capacity of the backup source recording medium 110 and automatically starts a backup operation when the data capacity of the recorded video file 120 and audio file 130 exceeds a predetermined amount. May be.

  The backup device 100 reads the header partition 310, the header metadata 320 and the footer partition 340 of the video file 120 recorded on the backup source recording medium 110, and the header partition 311, the header metadata 321 and the footer partition 341 of the audio file 130. Then, for each clip 500 (S610), the data constituting the video additional data file 470 and the audio additional data file 480 of several channels is extracted, and video additional data and audio additional data to be stored in the additional data file 170 are created. (S620). The backup device 100 repeats the additional data creation operation for the number of clips. When the creation of the additional data for all the clips is completed, the backup device 100 writes the created additional data to the backup destination recording medium 150 as the additional data file 170 (S630).

  The backup device 100 performs video / audio file conversion processing described later and writing to the backup destination recording medium 150 for each clip 500 (S640) (S650).

  When the conversion of all clips to be backed up is completed (No in S640), the backup device 100 ends the process.

(2-2. Video / audio file conversion operation)
Details of the video / audio file conversion operation will be described below. FIG. 7 is a flowchart showing the video / audio file conversion operation.

  The backup device 100 creates a header partition 410, header metadata 420, and footer partition 440 of the video / audio file from the video file 120 and the audio file 130 in accordance with the contents of the video data and audio data in the file (S710). ).

  The backup device 100 writes the created header partition 410 and header metadata 420 to the backup destination recording medium 150 (S720).

  The backup device 100 reads the frame length of the video data stored in the video essence 330 in the video file 120, and performs content package processing (S740) and content package writing in units of frames until the frame length is reached (S730). (S750) is executed. Details of the content package processing will be described later.

  The backup processing apparatus 100 completes the processing of all frames for the video data stored in the video essence 330 in the video file 120 and the audio data of all channels stored in the audio essence CH 331 in the audio file 130. (No in S730), the footer partition 440 is written (S760).

(2-3. Content Package Processing Operation)
FIG. 8 is a flowchart showing details of the content package processing operation.

  The backup processing apparatus 100 extracts video data for one frame of the video essence 330 from the video essence 330 of the video file 120 as a video essence (frame) 431 (S810).

  The backup processing apparatus 100 extracts audio data for one frame of the audio essence CH331 from the audio essence CH331 of the audio file 130 as an audio essence CH (frame) 432 for each number of audio channels (S820) (S830). ).

  The backup processing apparatus 100 creates a content package 430 from the extracted video essence (frame) 431 and audio essence CH (frame) 432.

(3. Summary)
The backup device 100 includes a first recording medium control unit 206 that controls access to the backup source recording medium 110 in which at least one video file 120 including video data and at least one audio file 130 including audio data are recorded. And the second recording medium control unit 207 that controls access to the backup destination recording medium 150 that backs up the data on the backup source recording medium 110 and the first recording medium control unit 206, the video at the same time Data and audio data are sequentially read at predetermined time intervals, and the read video data and audio data are collected and recorded on the backup destination recording medium 150 via the second recording medium control unit 207. By providing a control program, the backup destination Confirmation and of the video data and audio data that was backed up to the medium 150, even if you use only a portion, it is possible to reduce the read data, it is possible to shorten the data recovery time.

  In addition, the backup device 100 receives the header information 310 and 320 and the footer information 340 including meta information related to the video data of the video file 120 and the meta information related to the audio data of the audio file 130 via the first recording medium control unit 206. The header information 311 and 321 including the header information and the footer information 341 are read out, and the read header information and footer information are collected and recorded in the backup destination recording medium 150 via the second recording medium control unit 207. Later, even when the video file 120 and the audio file 130 in the backup source recording medium 110 are deleted, the backup source video file 120 and the audio file 130 are completely restored from the data backed up in the backup destination recording medium 150. Can Kill.

(Other embodiments)
In the first embodiment, the data of one frame is extracted and stored as the video essence (frame) 431 and the audio essence CH (frame) 432 in the backup destination content package 430. However, the present invention is not limited to this. Data in units of frames may be extracted and stored, or data in units of several seconds may be extracted and stored.

  In the first embodiment, the video file 120 and the audio file 130 recorded on the backup source recording medium 110 are backed up. However, the present invention is not limited to this, and the files related to the video file 120 and the audio file 130 are backed up simultaneously. Also good.

  In the first embodiment, the video additional data file 470 and the audio additional data file 480 store the components of the video file 120 and the audio file 130 recorded in the backup source recording medium 110 as they are. However, the present invention is not limited to this. Alternatively, the components may be stored as separate files, may be stored in a KLV (Key-Length-Value) structure defined by SMPTE 336M, or the file 490 stored in the backup destination recording medium 150 It may be stored inside. When the video additional data file 470 and the audio additional data file 480 are stored in the file 490 of the backup destination recording medium 150, by restoring only the file 490, the video file 120 in the backup source recording medium 110 and The audio file 130 can be restored with the same file, and the portability of video data and audio data can be improved.

  In the first embodiment, the audio essence CH 331 is divided for each audio channel. However, the present invention is not limited to this, and the audio essence CH 331 may store a plurality of audio channels. The data structure of the content package 430 in that case is the same.

  The backup device according to the present embodiment can check the contents of backed up video data and audio data, reduce the data to be read even when only a part is used, and shorten the data restoration time. It can be used as a backup device in a station or the like and is useful.

100 Backup Device 110 Backup Source Recording Medium 150 Backup Destination Recording Medium 201 CPU
202 ROM
203 RAM
204 Operation Unit 205 Display Unit 206 First Recording Medium Control Unit 207 Second Recording Medium Control Unit

Claims (6)

A first recording medium control unit that controls access to a first recording medium in which at least one video file including video data and at least one audio file including audio data are recorded;
A second recording medium control unit that controls access to a second recording medium that backs up data on the first recording medium;
Via the first recording medium control unit, video data and audio data at the same time are sequentially read out in predetermined time interval units, and the read video data and audio data are collected together, and the second recording medium control unit is A recording control unit for recording on the second recording medium,
A recording apparatus comprising: The recording control unit
Read header information and footer information including meta information related to the video data of the video file and header information and footer information including meta information related to the audio data of the audio file via the first recording medium control unit. The recording apparatus according to claim 1, wherein the read header information and footer information are collectively recorded on the second recording medium via the second recording medium control unit. The recording control unit
The video data and audio data read from the first recording medium and the header information and footer information read from the first recording medium are collected together via the second recording medium control unit. The recording apparatus according to claim 2. The recording control unit
The recording apparatus according to any one of claims 1 to 3, wherein video data and audio data at the same time are sequentially read in units of frames as the predetermined time interval unit. The first recording medium control unit
Controlling access to a randomly accessible first recording medium;
The second recording medium controller is
The recording apparatus according to claim 1, wherein random access is impossible or access to the second recording medium that requires time to seek is controlled. A step of reading out the video data and the audio data from a first recording medium in which at least one video file including the video data and at least one audio file including the audio data are recorded;
Using the readout step, the video data and audio data at the same time are sequentially read out in predetermined time interval units, and the read video data and audio data are combined to create backup data; and
A recording step of recording the backup data created in the data creation step on a second recording medium;
Recording method.

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