JP4280975B2 - Data recording control device and method, data reproducing device and method, and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a data recording control device and method, a data reproduction device and method,And programIn particular, for example, a data recording control device and method, a data reproduction device and method, and the like, which can perform editing processing more easily, for example,And programAbout.
[0002]
[Prior art]
In recent years, a method in which additional information is added as editing information to image data or audio data when image data or audio data acquired by shooting or the like is recorded on a recording medium has become widespread (for example, patents). Reference 1).
[0003]
For example, when image data and audio data are recorded on a video tape by a VTR (Video Tape Recorder) or the like, as shown in FIG. 1A, the essence data storage area 11 which is a predetermined storage area of the video tape 10 is used. Are recorded sequentially in the form of audio data and image data (black rectangular portions inclined obliquely in the figure), and in the additional information storage area 13, which is a predetermined storage area, the time code of each frame of the image data The LTC (Linear Time Code) is recorded in correspondence with the image data.
[0004]
In the case of FIG. 1A, three clips (clips 12-1 to 12-3) including image data and audio data are recorded in the essence data storage area 11 of the video tape 10, and LTC is added correspondingly. It is stored in the information storage area 13. The values of the leading LTCs 14-1 to 14-3, which are the leading LTCs of the LTCs corresponding to the clips 12-1 to 12-3, are “00: 10: 20: 00” and “12:34”, respectively. : 56: 10 "and" 00: 00: 30: 15 ".
[0005]
The LTC is continuous within each clip, but may be discontinuous between clips, and the same value of LTC may exist in multiple clips.
[0006]
By the way, as a method for editing image data and audio data, there is a method called non-linear editing (NLE) in recent years, in which editing is performed using a personal computer or the like. In non-linear editing, as shown in FIG. 1B, image data and audio data are recorded as files, for example, in units of clips on a hard disk (HDD) 20 of a personal computer used as a data editing device.
[0007]
In the case of FIG. 1B, essence data, which is data to be edited including image data and audio data, is recorded on the hard disk 20 as files 21-1 and 21-2. In this case, the essence data can be specified in units of frames, for example, and a frame number is assigned to each frame for each file. This frame number is managed as an FTC (File Time Code), and a user who edits essence data can directly specify a necessary part of a necessary file using this FTC.
[0008]
Since this FTC (frame number) is relative position information assigned to each frame in order from the first frame, the number of the first frame of each file is “0”. Number) may exist in multiple files.
[0009]
[Patent Document 1]
JP 2001-29241 A (pages 14-15, FIG. 8)
[0010]
[Problems to be solved by the invention]
However, for example, in the case of FIG. 1A, LTC, which is a time code associated with a frame, represents the time when image data is created by shooting or the like, and manages the recording position of the corresponding essence data on the video tape. Not meant to be Therefore, as described above, the value of the LTC is not always continuous between the clips, and the editor cannot directly search the essence data of a desired frame using the LTC. there were.
[0011]
In the case of FIG. 1A, the editor needs to search for a desired frame using the displayed LTC while outputting the essence data in order from the top.
[0012]
Further, for example, in the case of FIG. 1B, the editor can directly search the essence data of a desired frame using the FTC indicating the frame number. However, as described above, the FTC is a value indicating the relative position from the first frame of each file, and is an independent data for each file. Therefore, the editor uses this FTC to create a plurality of files. In the meantime, there is a problem that it is not possible to easily grasp the order of time when image data is created by photographing or the like.
[0013]
For example, when editing a plurality of files to create a single file, the editor could not easily synchronize reproduction between essence data included in each file. It was difficult to synchronize timing.
[0014]
The present invention has been made in view of such circumstances, and is intended to improve the convenience of a recording medium, such as enabling editing processing more easily.
[0015]
[Means for Solving the Problems]
  A data recording control apparatus according to the present invention periodically performs recording control, and records first recording control means for recording image data on a recording medium for each data amount that is an integral multiple of a recording / reproducing unit, and the recording control periodically Second position information, which is absolute position information of each frame of the image data, is recorded on the recording medium as first metadata of the image data for each data amount that is an integral multiple of the recording / playback unit. Recording control means, recording control, and first position information and second position information that is relative position information with respect to the first frame of the frame corresponding to the first position information. And a third recording control means for recording on the recording medium as second metadata of the image data, and the first recording control means and the second recording control means include the image data and the first metadata. , The recording and playback unit of the recording medium Arranged alternately every recording area of a few times the lengthThen, the third recording control means uses the second metadata corresponding to the first metadata recorded periodically as data having a data amount that is an integral multiple of the recording / reproducing unit, Recording in a predetermined area different from the area where the data and the first metadata are recordedIt is characterized by that.
[0016]
The first position information may be a time code indicating an absolute position of the frame using actual time.
[0017]
The first position information may be a time code indicating an absolute position of a frame using time information with a predetermined time as a reference.
[0018]
The second position information may be a time code indicating a relative position of the frame using a frame number indicating the number of frames from the first frame of the image data.
[0020]
The first metadata may be metadata for each frame of image data.
[0022]
The second metadata may be metadata for each file including image data.
[0024]
  The data recording control method of the present invention includes a first recording control step for periodically performing recording control and recording image data on a recording medium for each data amount that is an integral multiple of a recording / reproducing unit, and the recording control is periodically performed. First position information, which is absolute position information of each frame of the image data, is recorded on the recording medium as first metadata of the image data for each data amount that is an integral multiple of the recording / playback unit. Two recording control steps, recording control, first position information, and second position information that is relative position information with reference to the first frame of the frame corresponding to the first position information; And a third recording control step for recording on the recording medium as the second metadata of the image data. The processing of the first recording control step and the processing of the second recording control step 1 me Data, to place alternately every recording area integral multiple of the length of the recording unit of the recording mediumAnd performing the process of the third recording control step with the second metadata corresponding to the first metadata periodically recorded as data having a data amount that is an integral multiple of the recording / reproducing unit. The image data and the first metadata are recorded in a predetermined area different from the area where the image data and the first metadata are recorded.It is characterized by that.
[0025]
  The first program of the present invention periodically performs recording control, and records the recording data on a recording medium for each data amount that is an integral multiple of the recording / reproducing unit, and the recording control is periodically performed. Second position information, which is absolute position information of each frame of the image data, is recorded on the recording medium as first metadata of the image data for each data amount that is an integral multiple of the recording / playback unit. Recording control step, recording control, first position information, and second position information that is relative position information relative to the first frame of the frame corresponding to the first position information. And a third recording control step for recording on the recording medium as the second metadata of the image data. The processing of the first recording control step and the processing of the second recording control step Metadata And executed by a computer to place alternately every recording area integral multiple of the length of the recording unit of the recording mediumThen, the processing of the third recording control step is performed with the second metadata corresponding to the first metadata periodically recorded as data having an amount of data that is an integral multiple of the recording / reproducing unit. And causing the computer to execute recording in a predetermined area different from the area where the image data and the first metadata are recorded.It is characterized by that.
[0026]
  The data reproducing apparatus of the present invention performs read control, and includes first position information corresponding to first position information, which is absolute position information of each frame of image data, designated by a user, A table that associates the second position information that is relative position information with respect to the first frame of the frame corresponding to the position information ofIn a predetermined area different from the area where the image data and the first metadata including the first position information of the recording medium are alternately arranged for each recording area having a length that is an integral multiple of the recording / reproducing unit of the recording medium. ,Data amount that is an integral multiple of the recording / playback unitAs data withOf recorded image dataSecondUsing the first read control means for performing read control to read from the metadata and the table read by the first read means, the second position information corresponding to the first position information designated by the user is obtained. And a second reading control unit that performs reading control and starts reading image data from a frame of image data corresponding to the second position information calculated by the calculating unit. And
[0027]
  The data reproduction method of the present invention performs read control, and includes first position information corresponding to first position information, which is absolute position information of each frame of image data, designated by a user, A table that associates the second position information that is relative position information with respect to the first frame of the frame corresponding to the position information ofIn a predetermined area different from the area where the image data and the first metadata including the first position information of the recording medium are alternately arranged for each recording area having a length that is an integral multiple of the recording / reproducing unit of the recording medium. ,Data amount that is an integral multiple of the recording / playback unitAs data withOf recorded image dataSecondThe second position information corresponding to the first position information designated by the user is calculated using the first read control step read from the metadata and the table read by the processing of the first read step. A calculation step; and a second read control step of performing read control and starting reading of the image data from a frame of image data corresponding to the second position information calculated by the process of the calculation step. And
[0028]
  The second program of the present invention performs read control, and includes first position information corresponding to first position information, which is absolute position information of each frame of image data, designated by the user, A table that associates the second position information, which is relative position information with respect to the first frame, of the frame corresponding to the position information of 1,In a predetermined area different from the area where the image data and the first metadata including the first position information of the recording medium are alternately arranged for each recording area having a length that is an integral multiple of the recording / reproducing unit of the recording medium. ,Data amount that is an integral multiple of the recording / playback unitAs data withOf recorded image dataSecondThe second position information corresponding to the first position information designated by the user is calculated using the first read control step read from the metadata and the table read by the processing of the first read step. The computer implements a calculation step and a second read control step of performing read control and starting reading of image data from a frame of image data corresponding to the second position information calculated by the process of the calculation step. It is characterized by that.
[0030]
  In the data recording control apparatus and method and the first program of the present invention, recording control is performed periodically, and image data is recorded on a recording medium for each data amount that is an integral multiple of the recording / reproducing unit. The first position information, which is periodically performed and is the absolute position information of each frame of the image data, is recorded on the recording medium as the first metadata of the image data for each data amount that is an integral multiple of the recording / playback unit. Recording is performed, recording control is performed, and the first position information is associated with second position information that is relative position information with respect to the first frame of the frame corresponding to the first position information. The second metadata of the image data is recorded on the recording medium, and the image data and the first metadata are alternately arranged for each recording area having an integral multiple of the recording / playback unit of the recording medium.The second metadata corresponding to the first metadata recorded periodically is data having an amount of data that is an integral multiple of the recording / playback unit, and the image data and the first metadata of the recording medium are Recorded in a predetermined area different from the area to be recorded.
[0031]
  In the data reproducing apparatus and method and the second program according to the present invention, read control is performed, and the first position information, which is absolute position information of each frame of the image data, designated by the user is handled. A table associating the first position information with the second position information that is relative position information with respect to the first frame of the frame corresponding to the first position information,In a predetermined area different from the area where the image data and the first metadata including the first position information of the recording medium are alternately arranged for each recording area having a length that is an integral multiple of the recording / reproducing unit of the recording medium. ,Data amount that is an integral multiple of the recording / playback unitAs data withOf recorded image dataSecondSecond position information corresponding to the first position information designated by the user is calculated using the read table read from the metadata, read control is performed, and the calculated second Reading of image data is started from a frame of image data corresponding to the position information.
[0050]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below with reference to the drawings.
[0051]
FIG. 2 shows a configuration example of an embodiment of a disk recording / reproducing apparatus (disk apparatus) 30 to which the present invention is applied.
[0052]
The spindle motor 32 rotationally drives the optical disc 31 by CLV (Constant Linear Velocity) or CAV (Constant Angular Velocity) based on the spindle motor drive signal from the servo control unit 35.
[0053]
The pickup unit 33 records the recording signal on the optical disc 31 by controlling the output of the laser beam based on the recording signal supplied from the signal processing unit 36. The pickup unit 33 also condenses and irradiates the optical disc 31 with laser light, photoelectrically converts the reflected light from the optical disc 31 to generate a current signal, and supplies it to an RF (Radio Frequency) amplifier 34. The irradiation position of the laser beam is controlled to a predetermined position by a servo signal supplied from the servo control unit 35 to the pickup unit 33.
[0054]
The RF amplifier 34 generates a focus error signal, a tracking error signal, and a reproduction signal based on the current signal from the pickup unit 33, supplies the tracking error signal and the focus error signal to the servo control unit 35, and outputs the reproduction signal. The signal is supplied to the signal processing unit 36.
[0055]
The servo control unit 35 controls the focus servo operation and the tracking servo operation. Specifically, the servo control unit 35 generates a focus servo signal and a tracking servo signal based on the focus error signal and the tracking error signal from the RF amplifier 34 and supplies them to an actuator (not shown) of the pickup unit 33. To do. The servo control unit 35 generates a spindle motor drive signal for driving the spindle motor 32 and controls a spindle servo operation for rotating the optical disc 31 at a predetermined rotational speed.
[0056]
Further, the servo control unit 35 performs thread control for moving the pickup unit 33 in the radial direction of the optical disc 31 to change the irradiation position of the laser beam. The signal reading position of the optical disc 31 is set by the control unit 40, and the position of the pickup unit 33 is controlled so that the signal can be read from the set reading position.
[0057]
The signal processing unit 36 modulates the recording data input from the memory controller 37 to generate a recording signal, and supplies the recording signal to the pickup unit 33. The signal processing unit 36 also demodulates the reproduction signal from the RF amplifier 34 to generate reproduction data, and supplies the reproduction data to the memory controller 37.
[0058]
As will be described later, the memory controller 37 appropriately stores the recording data from the data conversion unit 39 in the memory 38, reads it, and supplies it to the signal processing unit 36. The memory controller 37 also appropriately stores the reproduction data from the signal processing unit 36 in the memory 38, reads it, and supplies it to the data conversion unit 39.
[0059]
The data conversion unit 39 requires a captured image and audio signal captured by a video camera (not shown) and a signal reproduced from a recording medium (not shown) supplied from the signal input / output device 51. Accordingly, for example, recording data is generated by compression based on a method such as MPEG (Moving Picture Experts Group) or JPEG (Joint Photographic Experts Group), and is supplied to the memory controller 37.
[0060]
The data conversion unit 39 also expands the reproduction data supplied from the memory controller 37 as necessary, converts it into an output signal of a predetermined format, and supplies it to the signal input / output device 51.
[0061]
The control unit 40 controls the servo control unit 35, the signal processing unit 36, the memory controller 37, and the data conversion unit 39 on the basis of an operation signal from the operation unit 41, and executes the recording / reproducing process.
[0062]
For example, the operation unit 41 is operated by a user and supplies an operation signal corresponding to the operation to the control unit 40.
[0063]
In the disc recording / reproducing apparatus 30 configured as described above, when the user instructs to record data by operating the operation unit 41, the data supplied from the signal input / output device 51 is stored in the data conversion unit 39, the memory The data is supplied to the optical disc 31 through the controller 37, the signal processing unit 36, and the pickup unit 33 and recorded.
[0064]
Further, when the user instructs to reproduce data by operating the operation unit 41, the optical disk 31 passes through the pickup unit 33, the RF amplifier 34, the signal processing unit 36, the memory controller 37, and the data conversion unit 39. Data is read and reproduced and supplied to the signal input / output device 51.
[0065]
FIG. 3 shows a configuration example of the data conversion unit 19 of FIG.
[0066]
When data is recorded on the optical disc 31, a signal to be recorded is supplied from the signal input / output device 51 to the demultiplexer 61. The demultiplexer 61 includes, for example, a moving image (for example, baseband) image signal and an associated (for example, baseband) image signal as a plurality of related data series from the signal supplied from the signal input / output device 51. The audio signal and the metadata are separated from each other and supplied to the data amount detection unit 62.
[0067]
That is, when recording data on the optical disc 31, the signal input / output device 51 outputs a signal obtained by a video camera (not shown), for example, as described above. Includes an image signal obtained by imaging a subject and an audio signal accompanying the image signal, as well as metadata about the image signal. In addition to signals and audio signals, metadata is also separated.
[0068]
Here, as metadata, there are frame metadata added to each frame of the image signal and clip metadata added to each clip.
[0069]
A frame is a unit of an image signal and is an image signal corresponding to an image for one screen. A clip is a unit indicating one imaging process until the photographer starts and ends imaging. That is, the image signal of one clip is usually composed of image signals of a plurality of frames. Note that a clip is not only a single imaging process, but also a unit indicating the time from the start of imaging to the end of imaging, and a unit indicating the length of various data obtained by the imaging process. It is also a unit indicating the data amount of various data obtained by the imaging process. Furthermore, the clip may also indicate the collection of various data itself.
[0070]
The frame metadata is data corresponding to the added frame, and is data that requires real-time properties when reproducing an image signal. That is, as frame metadata, for example, the absolute position information of each frame (for example, specifying the position of the frame using predetermined time information such as date and time (year, month, day, hour, minute, second)) ( The time code (LTC), the user bit (UB: User Bit) indicating the signal characteristics of the image signal of the frame, the UMID (Unique Material Identifier), and the GPS (Global Positioning System) that indicates the position where the video camera was imaged ), Essence marks, which are information relating to the contents of essence data such as image signals and audio signals, ARIB (Association of Radio Industries and Businesses) metadata, and setting / control information of the video camera in which the image is taken. The ARIB metadata is metadata that is standardized by ARIB and superimposed on a standard communication interface such as SDI (Serial Digital Interface). The video camera setting / control information includes, for example, IRIS (iris) control values, white balance / black balance modes, lens information relating to lens zoom and focus, and the like.
[0071]
The clip metadata is data corresponding to the added clip as a whole, and is data that does not require real-time properties when reproducing an image signal. That is, as clip metadata, for example, there is a conversion table in which LTC corresponding to each frame is associated with a frame number, UMID, GPS information, or other information.
[0072]
Normally, image data is filed for each clip and managed by a file system. That is, the clip metadata can be metadata for each file including image data.
[0073]
Note that data other than those described above may be included as frame metadata and clip metadata. Also, the same content data may be included in the frame metadata and the clip metadata, each data as the frame metadata described above may be used as clip metadata, and conversely, as described above as clip metadata. Each data may be frame metadata. For example, essence marks, ARIB metadata, or video camera setting / control information may be included as clip metadata, or may be included in both frame metadata and clip metadata. Further, UMID and GPS information may be included in the frame metadata, or may be included in both the frame metadata and the clip metadata.
[0074]
The data amount detection unit 62 uses the image signal, audio signal, frame metadata, and clip metadata supplied from the demultiplexer 61 as they are, the image signal conversion unit 63, the audio signal conversion unit 64, the frame metadata processing unit 66, The data is supplied to the clip metadata 66, and the data amounts of the image signal, audio signal, frame metadata, and clip metadata are detected and supplied to the memory controller 37. That is, the data amount detection unit 62 detects, for example, a data amount for a predetermined reproduction time for each of the image signal, audio signal, frame metadata, and clip metadata supplied from the demultiplexer 61, and the memory controller 37. To supply.
[0075]
In addition, the data amount detection unit 62 supplies the image signal supplied from the demultiplexer 61 and, if necessary, an audio signal to the low resolution data generation unit 65.
[0076]
The image signal conversion unit 63 MPEG-encodes the image signal supplied from the data amount detection unit 62 using, for example, all frames as I (Intra) pictures, and the data sequence of the image data obtained as a result is converted to the memory controller 37. To supply. Also, the audio signal conversion unit 64 encodes the audio signal supplied from the data amount detection unit 62, for example, by MPEG encoding, and supplies the data sequence of the audio data obtained as a result to the memory controller 37.
[0077]
The frame metadata processing unit 66 rearranges each component of the frame metadata supplied via the data amount detection unit 62 as necessary, and converts the data sequence of the frame metadata obtained as a result into the memory controller 37. The frame metadata processing unit 66 also includes an LTC data processing unit 71 that generates LTC data corresponding to each frame when LTC data is not added to the signal supplied from the signal input / output device 51. ing. Furthermore, the frame metadata processing unit 66 supplies the processed data series of the LTC data to the clip metadata processing unit 67 as necessary.
[0078]
The clip metadata processing unit 67 rearranges each component of the clip metadata supplied via the data amount detection unit 62 as necessary, and the resulting clip metadata data series is stored in the memory controller. 37. The clip metadata processing unit 66 includes an LTC data processing unit 72. The LTC data processing unit 72 uses the data series of the LTC data supplied from the frame metadata processing unit 66 to generate a conversion table associating the LTC data with the frame number.
[0079]
The low resolution data generation unit 65 generates a data series of low resolution data, which is data obtained by reducing the amount of data supplied thereto, and supplies the data series to the memory controller 37.
[0080]
That is, the low resolution data generation unit 65 generates a small image signal that is an image signal of a frame having a small number of pixels by thinning out the number of pixels of each frame of the image signal supplied via the data amount detection unit 62. To do. Further, the low resolution data generation unit 65 encodes the small image signal by, for example, the MPEG4 method, and outputs the encoding result as low resolution data.
[0081]
The low resolution data generation unit 65 includes the low resolution data including an audio signal supplied via the data amount detection unit 62 or an audio signal whose data amount is reduced by thinning samples of the audio signal. It is possible to output (for example, in a form of being multiplexed on a small image signal in units of frames). In the following, it is assumed that the low resolution data includes an audio signal.
[0082]
Here, the data series of the image data output from the image signal conversion unit 63 and the audio data output from the audio signal conversion unit 64 and the data series of low resolution data output from the low resolution data generation unit 65 are the same image and image data. Although it is an audio data series, the image data output from the image signal conversion unit 63 and the audio data output from the audio signal conversion unit 64 should be essentially provided to the user. The image data output from the image signal conversion unit 63 and the audio data output from the audio signal conversion unit 64 are hereinafter referred to as main line data as appropriate.
[0083]
As described above, the low resolution data is image and audio data having the same content as the main line data, but the data amount is small. Accordingly, when reproduction is performed for a certain reproduction time, the low resolution data can be read from the optical disc 31 in a shorter time than the main line data.
[0084]
In addition, as a data rate of main line data, about 25 Mbps (Mega bit per second) is employable, for example. In this case, for example, about 3 Mbps can be adopted as the data rate of the low resolution data. Furthermore, in this case, if the metadata data rate is about 2 Mbps, for example, the data rate of the entire data recorded on the optical disc 11 is about 30 (= 25 + 3 + 2) Mbps. Therefore, as the optical disk 31 (the disk recording / reproducing device 30 for driving the optical disk 31), for example, a recording medium having a recording rate of 35 Mbps or the like and within a sufficiently practical range can be employed.
[0085]
As described above, the data conversion unit 39 in FIG. 3 supplies the data sequence of frame metadata, clip metadata, and low resolution data to the memory controller 37 in addition to the data sequence of main line data (image data and audio data). Is done. The main line data, frame metadata, clip metadata, and low resolution data supplied to the memory controller 37 are supplied to the optical disc 31 and recorded.
[0086]
On the other hand, when reproducing data from the optical disc 31, main line data, frame metadata, clip metadata, or low resolution data is read from the optical disc 31 as necessary. The image data and audio data constituting the main line data are supplied to the image data converter 81 and the audio data converter 82, respectively, decoded into an image signal and an audio signal, and supplied to the multiplexer 86.
[0087]
Further, the metadata and the low resolution data are supplied to the metadata processing unit 53 and the low resolution data processing unit 54. The metadata processing unit 53 changes the arrangement position of each component of the metadata supplied thereto as necessary, and supplies it to the multiplexer 47. The low resolution data processing unit 54 decodes the low resolution data supplied thereto into an image signal and an audio signal with a small amount of data, and supplies the decoded image signal to the demultiplexer 47.
[0088]
The image data converter 81 decodes the data series of the image data supplied from the memory controller 37, for example, by MPEG, and supplies the resulting image signal to the multiplexer 86. Also, the audio data conversion unit 82 decodes the data series of the audio data supplied from the memory controller 37, for example, by MPEG, and supplies the audio signal obtained as a result to the multiplexer 86.
[0089]
The multiplexer 86 receives the image signal supplied from the image data conversion unit 81, the audio signal supplied from the audio data conversion unit 82, the frame metadata supplied from the frame metadata processing unit 84, and the clip metadata processing unit 85. The supplied clip metadata is supplied to the signal input / output device 51. In the multiplexer 86, the image signal supplied from the image data converter 81, the audio signal supplied from the audio data converter 46, the frame metadata supplied from the frame metadata processor 84, and the clip metadata processor 84. The image data and the audio signal with a small amount of data supplied from the clip metadata supplied from the low resolution data processing unit 83 can be multiplexed and output, and each signal (data) can be independently and parallelly output. It is also possible to output it.
[0090]
FIG. 4 is a block diagram illustrating a detailed configuration example of the LTC data processing unit 71 of FIG.
[0091]
The frame metadata processing unit 66 of FIG. 3 that incorporates the LTC data processing unit 71 shown in FIG. 4 receives, for example, image signals and audio signals obtained by imaging by an imaging device connected to the signal input / output device 51. When the LTC is not present in the supplied frame metadata as in the case of being supplied, a control signal and a synchronization signal are supplied to the LTC data processing unit 71 to request the generation of LTC.
[0092]
When acquiring the control signal and the synchronization signal, the control unit 101 of the LTC data processing unit 71 controls each part of the LTC data processing unit 71 based on these signals and performs an LTC generation process.
[0093]
When generating an LTC that is independent of the actual time with reference to a predetermined time, the control unit 101 includes an LTC generation unit 102 that performs an LTC generation process, an initial value setting unit 103 that performs an initial value setting process, And the counter 104 which counts a frame is controlled and various processes are performed.
[0094]
The LTC generation unit 102 is controlled by the control unit 101 to generate LTC data synchronized with the frame using the initial value supplied to the initial value setting unit 103 and the counter value supplied from the counter 104, and the LTC data Data is supplied to the frame metadata processing unit 66.
[0095]
The initial value setting unit 103 is controlled by the control unit 101 and executes processing related to setting of an initial value. Then, the initial value setting unit 103 supplies the set initial value to the LTC generation unit 102.
[0096]
The counter 104 counts the number of frames to be processed based on the synchronization signal supplied to the control unit 101, and supplies the count value to the LTC generation unit 102.
[0097]
When generating an LTC using actual time, the control unit 101 controls the LTC generation unit 102 that performs the LTC generation processing and the real-time clock 105 that supplies the actual time information, and executes various processes. .
[0098]
In this case, the LTC generation unit 102 is controlled by the control unit 101 to generate LTC data synchronized with the frame using time information supplied to the real-time clock 105, and the LTC data is sent to the frame metadata processing unit 66. Supply.
[0099]
The real-time clock 105 holds time information that is information related to actual time, and is controlled by the control unit 101 to supply the time information to the LTC generation unit 102.
[0100]
Next, a recording process performed by the control unit 40 when the data conversion unit 39 is configured as shown in FIG. 3 will be described with reference to the flowchart of FIG.
[0101]
When the operation unit 41 is operated and an operation signal for instructing the start of the recording process is supplied from the operation unit 41 to the control unit 40, the control unit 40 starts the recording process.
[0102]
That is, first, in step S1, the control unit 40 sets the audio annual ring size Tsa and the image annual ring size Tsv, and further, the low-resolution annual ring size Tsl and the frame meta annual ring size Tsm.
[0103]
Here, the audio annual ring size Tsa is a variable that determines the amount of audio data that is collectively arranged and recorded on the optical disc 31, and is represented by, for example, the reproduction time of the audio signal. Similarly, the image annual ring size Tsv is a variable that determines the data amount of image data that is collectively arranged and recorded on the optical disc 31, and is represented by, for example, the reproduction time of the image signal.
[0104]
The low-resolution annual ring size Tsl is a variable that determines the amount of low-resolution data to be arranged and recorded on the optical disk 31. For example, the low-resolution annual ring size Tsl is similar to the above-described audio annual ring size Tsa and image annual ring size Tsv. It is represented by the reproduction time of the original image signal (or audio signal). Similarly, the frame meta annulus size Tsm is a variable that determines the data amount of frame metadata that is collectively arranged and recorded on the optical disc 31. For example, the frame meta annulus size Tsm is similar to the audio annulus size Tsa and the image annulus size Tsv described above. Various information (for example, the date and time when an image was captured) is described by frame metadata, and is represented by the reproduction time of an image signal (or audio signal).
[0105]
Note that the audio annulus size Tsa, the image annulus size Tsv, the low-res annulus size Tsl, and the frame meta annulus size Tsm are not represented by, for example, the data amount itself such as the number of bits and the number of bytes, but indirectly by the playback time. The reason for this is as follows.
[0106]
That is, according to the recording process of FIG. 5, as will be described later, the optical disc 31 has audio annual ring data that is a group of audio data for each data amount based on the audio annual ring size Tsa extracted from the audio data A series. Image annual ring data, which is a group of image data for each data amount based on the image annual ring size Tsv extracted from the series of image data V, and low resolution data for each data amount based on the low resolution annual ring size Tsl extracted from the data series of low resolution data The frame meta annulus data, which is a group of frame metadata for each data amount based on the frame meta annulus size Tsm extracted from the data series of the frame meta data, and the low-resolution annulus data that is a unit of the frame meta data are also periodically arranged on the optical disc 31. To be recorded.
[0107]
As described above, when audio annual ring data, image annual ring data, low-resolution annual ring data, and frame meta annual ring data are periodically recorded on the optical disc 31, considering the reproduction of images and audio, the reproduction is as follows. It cannot be performed unless the image signal and the audio signal accompanying the image signal are complete. From the viewpoint of such reproduction, the audio annual ring data in a certain reproduction time zone and the image annual ring data in the reproduction time zone should be recorded at a close position on the optical disc 31, that is, for example, an adjacent position.
[0108]
In addition, since low-resolution annulus data is obtained by reducing the amount of data of audio annulus data and image annulus data, audio annulus data and image annulus data for a certain playback time zone, and audio annulus data and image annulus data for that playback time zone. Low-resolution annual ring data with a reduced data amount should be recorded at a close position on the optical disc 31. Furthermore, since the frame meta annulus data represents information related to the audio annulus data and the image annulus data, the audio annulus data and the image annulus data in a certain playback time zone, and the audio annulus data and the image in the playback time zone are also used. The frame meta annual ring data representing the information related to the annual ring data should be recorded at a close position on the optical disc 31.
[0109]
However, when comparing the amount of audio data and image data for the same playback time, the amount of data generally differs greatly. That is, the amount of audio data for a certain reproduction time is considerably smaller than the amount of image data for the reproduction time. Furthermore, there are cases where the data rate of audio data or image data is not fixed but variable. Similarly, when the data rate of audio data or image data for the same playback time is compared with the data rate of low resolution data or frame metadata, low resolution data or image data is compared with the data rate of audio data or image data. The data rate of frame metadata is small.
[0110]
Therefore, the audio annulus size Tsa and the image annulus size Tsv are represented by the data amount, and when the audio annulus data and the image annulus data for each data amount are sequentially extracted from the respective sequences of the audio data and the image data, With respect to the image annulus data, audio annulus data in the playback time zone in which the playback time gradually advanced (previous) can be obtained. As a result, the audio data and the image data to be played back in the same playback time zone It is difficult to dispose these at close positions on the optical disc 31.
[0111]
Similarly, when the low-resolution annulus size Tsl and the frame meta annulus size Tsm are represented by the data amount, similarly to the above-described case where the audio annulus size Tsa and the image annulus size Tsv are represented by the data amount, There arises a disadvantage that it is difficult to arrange the audio data, image data, low resolution data, and frame metadata to be reproduced at close positions on the optical disc 31.
[0112]
Therefore, the audio annulus size Tsa, the image annulus size Tsv, the low resolution annulus size Tsl, and the meta annulus size Tsm are represented by the reproduction time, and thereby, the audio data, the image data, and the low resolution data to be reproduced in the same reproduction time zone. , And the frame metadata can be arranged at a close position on the optical disc 31.
[0113]
Note that the values of the sound annual ring size Tsa, the image annual ring size Tsv, the low resolution annual ring size Tsl, and the frame meta annual ring size Tsm set in step S1 may be fixed values that are set in advance or may be variable values. When the values of the sound annual ring size Tsa, the image annual ring size Tsv, the low-resolution annual ring size Tsl, and the meta annual ring size Tsm are variable, the variable values are input by operating the operation unit 41, for example. Can be.
[0114]
After the process of step S1, the process proceeds to step S2, and the control unit 40 controls the data conversion unit 39 to compress the audio signal and the image signal supplied from the signal input / output device 51 to the disk recording / reproducing device 30. The audio signal conversion process and the image signal conversion process, which are encoded to form an audio data sequence and an image data sequence, are started, and the memory controller 37 is controlled so that the audio data and the image obtained by the data conversion unit 39 are controlled. Audio data storage processing and image data storage processing for supplying and storing data to the memory 18 are started.
[0115]
Further, in step S2, the control unit 40 controls the data conversion unit 39 to process frame metadata processing for processing a sequence of frame metadata supplied from the signal input / output device 51 to the disc recording / reproducing device 30, and a signal The data conversion unit 39 controls the memory controller 37 and starts the low resolution data generation processing for generating a low resolution data sequence from the audio signal and the image signal supplied from the input / output device 51 to the disc recording / reproducing device 30. The frame metadata storage process and the low resolution data storage process for supplying the frame metadata and the low resolution data obtained to the memory 38 to be stored are started.
[0116]
In step S 2, the control unit 40 controls the data conversion unit 39 to execute a process of a sequence of clip metadata supplied from the signal input / output device 51 to the disc recording / reproducing device 30. Using the LTC included in the frame metadata, a clip metadata process for executing a process related to the LTC is started, and the memory controller 37 is controlled to supply the clip metadata obtained by the data converter 39 to the clip metadata. Then, the clip metadata storage process to be stored is started.
[0117]
In step S3, the control unit 40 starts an audio data recording task that is a control task for recording audio data on the optical disc 31, and in step S4, image data is a control task for recording image data on the optical disc 31. The recording task is started and the process proceeds to step S5. In step S5, the control unit 40 starts a low resolution data recording task, which is a control task for recording low resolution data on the optical disc 31, and in step S6, frame metadata recording, which is a control task for recording frame metadata on the optical disc 31. The task is started and the process proceeds to step S7. Details of the audio data recording task in step S3, the image data recording task in step S4, the low resolution data recording task in step S5, and the frame metadata recording task in step S6 will be described later.
[0118]
In step S7, the control unit 40 determines whether or not an operation signal for instructing the end of data recording is supplied from the operation unit 41. If it is determined that the operation signal is not supplied, the control unit 40 proceeds to step S8. Determines whether all recording tasks have been completed. If it is determined in step S8 that all the recording tasks have not been completed, the control unit 40 returns the process to step S7 and repeats the subsequent processes.
[0119]
On the other hand, if it is determined in step S7 that an operation signal for instructing the end of data recording has been supplied, that is, for example, if the user operates the operation unit 41 to end the data recording, In step S9, the control unit 40 starts the audio signal conversion process, the image signal conversion process, the frame metadata process, and the low-resolution data generation process started in step S2, and the audio data storage process, the image data storage process, and the frame metadata. The storage process and the low resolution data storage process are terminated, and the process proceeds to step S10.
[0120]
In step S10, as in the case of step S8, the control unit 40 determines whether all the recording tasks have been completed, and waits until it is determined that the recording tasks have been completed.
[0121]
If it is determined in step S10 that all the recording tasks have been completed, that is, the audio data recording task started in step S3, the image data recording task started in step S4, and the low resolution started in step S5. When all of the data recording task and the frame metadata recording task started in step S6 are completed, the control unit 40 advances the processing to step S11.
[0122]
If it is determined in step S8 that all recording tasks have been completed, that is, the audio data recording task started in step S3, the image data recording task started in step S4, and the low resolution started in step S5. If all of the data recording task and the frame metadata recording task started in step S6 have been completed, the control unit 40 advances the processing to step S11.
[0123]
In step S11, the control unit 40 controls the memory controller 37 to read the clip metadata stored in the memory 38, pad the data so as to have an amount of data that is an integral multiple of the sector, and send it to the signal processing unit 36. By supplying, recording control is performed so that clip metadata of an integral multiple of the sector is recorded in sectors of the integral multiple.
[0124]
The control unit 40 advances the processing to step S12, ends the clip metadata processing, ends the clip metadata storage processing, and ends the recording processing.
[0125]
Next, the audio data recording task started in step S3 of FIG. 5 will be described with reference to the flowchart of FIG.
[0126]
When the audio data recording task is started, first, in step S31, the control unit 40 initializes a variable Na incremented by one to, for example, 1 in the process of step S37 performed later, and proceeds to step S32. move on.
[0127]
In step S32, the control unit 40 determines whether Tsa × Na is equal to or smaller than Tsv × Nv, and further determines whether Tsa × Na is equal to or smaller than Tsl × Nl and equal to or smaller than Tsm × Nm. To do.
[0128]
Here, Tsa is a sound annual ring size and represents a certain reproduction time of the sound signal. Further, as will be described later, the variable Na is incremented by one each time audio data (audio annual ring data) having a data amount based on the audio annual ring size Tsa is recorded on the optical disc 31. Similarly, Tsv is the image annulus size, and the variable Nv is recorded on the optical disc 31 in the amount of image data (image annulus data) based on the image annulus size Tsv in the image data recording task, as will be described later. Every time it is incremented by one.
[0129]
Further, Tsl is the low-resolution annual ring size, and the variable Nl is recorded every time low-resolution data (low-resolution annual ring data) having a data amount based on the low-resolution annual ring size Tse is recorded on the optical disc 31 in the low-resolution data recording task. Incremented by one. Further, Tsm is the frame meta annual ring size, and the variable Nm is, as will be described later, the frame metadata (frame meta annual ring data) having a data amount based on the frame meta annual ring size Tsm in the frame metadata recording task. Each time it is recorded, it is incremented by one.
[0130]
Therefore, Tsa × Na corresponds to the last reproduction time of the sound annual ring data to be recorded on the optical disk 31 when the sound data is recorded in units of the sound annual ring size Tsa, and Tsv × Nv is When image data is recorded in units of image annulus size Tsv, this corresponds to the last reproduction time of image annulus data to be recorded on the optical disk 31 from now on. Further, Tsl × Nl corresponds to the last reproduction time of the low-resolution annual ring data to be recorded on the optical disc 31 when the low-resolution data is recorded in units of the low-resolution annual ring size Tse, and Tsm × Nm is When frame metadata is recorded in units of the frame meta annulus size Tsm, this corresponds to the last reproduction time of the frame meta annulus data to be recorded on the optical disc 31 from now on.
[0131]
On the other hand, the audio annulus data, the image annulus data, the low-resolution annulus data, and the frame meta annulus data are periodically arranged so that data in the same playback time zone are recorded at close positions on the optical disc 31. It shall be. Further, for voice annulus data, image annulus data, low-resolution annulus data, and frame meta annulus data, the earlier the reproduction time, the earlier position of the optical disc 31 (the earlier position in the order of data read / write to the optical disc 31) In addition, for example, audio annulus data, image annulus data, low-resolution annulus data, low-resolution annulus data, frame meta annulus data, for example, It is assumed that the data is arranged at an earlier position on the optical disc 31 in the order of data.
[0132]
In this case, the target voice annual ring data, which is the voice annual ring data to be recorded from now on, becomes the voice annual ring data of the latest playback time zone (closest to the playback time Tsa × Na) before the playback time Tsa × Na. The attention voice annual ring data is the second immediately before the reproduction time Tsa × Na, that is, immediately before the image annual ring data, the low-resolution annual ring data, and the frame meta annual ring data of the latest reproduction time zone before the reproduction time Tsa × Na are recorded. It is necessary to record immediately after the image annulus data, the low-resolution annulus data, and the frame meta annulus data in the new playback time zone are recorded.
[0133]
By the way, the image annulus data recorded from now on is the image annulus data of the latest reproduction time zone before Tsv × Nv. The low-resolution annulus data recorded from now on is the low-resolution annulus data of the latest playback time zone before Tsl × Nl, and the frame meta-annulus data to be recorded from now on is the frame of the latest playback time zone before Tsm × Nm. Meta annual ring data. As for the annual ring data in the same playback time zone, as described above, since the audio annual ring data is arranged at a position before the optical disc 31, the recording of the audio annual ring data is performed at the playback time Tsa of the audio annual ring data. × Na is the reproduction time Tsv × Nv or less of the image annual ring data, and is less than or equal to the reproduction time Tsl × Nl of the low-resolution annual ring data and is less than or equal to the reproduction time Tsm × Nm of the frame meta annual ring data. It is necessary to do at the timing.
[0134]
Therefore, in step S32, as described above, the reproduction time Tsa × Na of the audio annulus data is less than or equal to the reproduction time Tsv × Nv of the image annulus data, and further is less than or equal to the reproduction time Tsl × Nl of the low-resolution annulus data. In addition, it is determined whether or not the reproduction time Tsm × Nm of the frame meta annulus data is below, and thereby it is determined whether or not the current timing is the timing at which the target audio annulus data should be recorded.
[0135]
In step S32, the reproduction time Tsa × Na of the audio annual ring data is any of the reproduction time Tsv × Nv of the image annual ring data, the reproduction time Tsl × Nl of the low-resolution annual ring data, or the reproduction time Tsm × Nm of the frame meta annual ring data. If it is determined that the current timing is not the timing at which the voice annual ring data should be recorded, the control unit 40 returns the process to step S32 and repeats the subsequent processes. .
[0136]
In step S32, the reproduction time Tsa × Na of the audio annual ring data is all of the reproduction time Tsv × Nv of the image annual ring data, the reproduction time Tsl × Nl of the low-resolution annual ring data, and the reproduction time Tsm × Nm of the frame meta annual ring data. If it is determined that the current timing is the timing at which the current voice annual ring data should be recorded, the control unit 40 advances the process to step S33, from the data conversion unit 39 to the memory. It is determined whether audio data is supplied to the memory 38 via the controller 37. If it is determined that the audio data is supplied, the process proceeds to step S34.
[0137]
In step S34, the control unit 40 determines whether or not the sound data of the sound signal necessary for reproduction corresponding to the sound annual ring size Tsa × Na is stored in the memory 38, and the sound corresponding to the sound data is still stored. If it is determined that the data is not stored in the memory 38, the process returns to step S32 and the subsequent processing is repeated. If it is determined in step S34 that the audio data corresponding to the reproduction time Tsa × Na has been stored in the memory 38, the control unit 40 advances the process to step S35.
[0138]
In addition, when the data amount detection unit 62 of the data conversion unit 39 detects the audio signal necessary for reproduction for the reproduction time Tsa × Na in total, it notifies the memory controller 37 to that effect. Based on the notification, the memory controller 37 determines whether or not the audio data necessary for reproduction for the reproduction time Tsa × Na is stored in the memory 38, and the determination result is sent to the control unit 40. Notice. That is, the control unit 40 performs the determination in step S34 based on the determination result from the memory controller 37. In this embodiment, the image data obtained by compressing and encoding the audio signal is stored in the memory 38. However, the audio signal is directly compressed as audio data without being compressed and encoded. It can also be stored in the memory 38.
[0139]
In step S35, the control unit 40 controls the memory controller 37, for example, as a physical recording / reproduction unit (physical unit region) formed on the optical disc 31 from the audio data stored in the memory 38, for example. The maximum amount of audio data that is an integral multiple (n times) of the data amount Su of one sector and that can be read from the memory 38 is read from the one input earlier in time. The process proceeds to step S36. It should be noted that the audio annual ring data read from the memory 38 as the maximum amount of audio data that is an integral multiple of this sector and can be read from the memory 38 is the above-mentioned playback time Tsa × Na before the time. It is recent voice annual ring data.
[0140]
In step S36, the control unit 40 causes the memory controller 37 to supply the target voice annual ring data having a data amount that is an integral multiple of the sector obtained in the process of step S35 to the signal processing unit 36. Recording control is performed so that the voice annual ring data having an integer multiple of data amount is recorded in the integral multiple of sectors.
[0141]
In step S36, as described above, after performing the recording control of the attention voice annual ring data, the control unit 40 proceeds to the process in step S37, increments the variable Na by 1, returns to step S32, and the subsequent processes. Execute.
[0142]
On the other hand, when it is determined in step S33 that the audio data is not supplied to the memory 38, that is, when the supply of the audio data from the data conversion unit 39 to the memory controller 37 is stopped, the control unit 40 performs the step By proceeding to S38 and controlling the memory controller 37, all of the audio data currently remaining in the memory 38 is read out, and the audio data is converted into the audio data so that the data amount becomes the minimum data amount that is an integral multiple of the sector. , Padding data for padding (PADDING) is added. As a result, the audio data read from the memory 38 becomes audio annual ring data having a data amount that is an integral multiple of the sector. Further, the control unit 40 supplies the voice annulus data from the memory controller 37 to the signal processing unit 36, so that the voice annulus data having a data amount that is an integral multiple of the sector is transferred to the number of sectors that is an integral multiple of the sector. Recording control is performed so that recording is performed.
[0143]
Thereafter, the process proceeds to step S39, where the control unit 40 sets a value corresponding to infinity (very large value) for the variable Na, and ends the audio data recording task.
[0144]
In the above case, the physical unit area of the optical disc 31 is a sector. However, for example, ECC (Error Correction Code) processing is performed as the physical unit area of the optical disc 31. It is possible to use an ECC block in which a unit of data is recorded. In addition, the physical unit area of the optical disc 31 can be, for example, a plurality of fixed number of sectors or a plurality of fixed number of ECC blocks.
[0145]
Here, the ECC processing is performed in units of ECC blocks by the signal processing unit 36, for example. A sector can be composed of one or more ECC blocks. Alternatively, the ECC block can be composed of one or more ECC blocks.
[0146]
In the following, one sector is described as a physical unit area of the optical disc 31. If one ECC block is composed of one sector, the result of data recording on the optical disc 31 is the same whether the physical unit area is a sector or an ECC block.
[0147]
Next, the image data recording task started in step S4 of FIG. 5 will be described with reference to the flowchart of FIG.
[0148]
When the image data recording task is started, first, in step S51, the control unit 40 initializes a variable Nv incremented by 1 to 1, for example, in step S57 described later, and proceeds to step S52.
[0149]
In step S52, the control unit 40 determines whether Tsv × Nv is less than Tsa × Na, and further determines whether Tsv × Nv is Tsl × Nl or less and Tsm × Nm or less. To do.
[0150]
As described above, the audio annulus data and the image annulus data are periodically arranged so that data in the same reproduction time zone are recorded at close positions on the optical disc 31, and the same reproduction is performed. As for the audio annual ring data and the image annual ring data in the time zone, the audio annual ring data is arranged first, and then the image annual ring data is arranged. Then, if the image annulus data to be recorded from now on is referred to as the noticed image annulus data, the noticed image annulus data is the latest reproduction time zone (closest to the reproduction time Tsv × Nv) before the reproduction time Tsv × Nv. Although it becomes image annual ring data, this attention image annual ring data is immediately after the audio annual ring data of the latest playback time zone before the playback time Tsa × Na is recorded and the latest playback before the playback time Tsa × Na. It is necessary to record immediately before the low-resolution annulus data of the time zone and the frame meta annulus data are recorded. Accordingly, in the recording of the attention image annual ring data, the reproduction time Tsv × Nv of the image annual ring data is less than the reproduction time Tsa × Na of the audio annual ring data, and further, it is less than the reproduction time Tsl × Nl of the low-resolution annual ring data. In addition, it is necessary to perform it at a timing that is less than or equal to the reproduction time Tsm × Nm of frame meta annual ring data.
[0151]
Therefore, in step S52, as described above, the reproduction time Tsv × Nv of the image annual ring data is less than the reproduction time Tsa × Na of the audio annual ring data, and is less than or equal to the reproduction time Tsl × Nl of the low-resolution annual ring data. In addition, it is determined whether or not the reproduction time Tsm × Nm of the frame meta annulus data is less than or equal to this, and thereby it is determined whether or not the current timing is a timing for recording the noticed image annulus data.
[0152]
Therefore, in step S52, as described above, it is determined whether or not the reproduction time Tsv × Nv of the image annual ring data is less than the reproduction time Tsa × Na of the audio annual ring data. It is determined whether it is time to record the image annual ring data.
[0153]
In step S52, the reproduction time Tsv × Nv of the image annual ring data is not less than the reproduction time Tsa × Na of the audio annual ring data, or the reproduction time Tsl × Nl of the low-resolution annual ring data, or the reproduction time Tsm × of the frame meta annual ring data. If it is determined that the current timing is not the timing at which the current image annual ring data should be recorded, the control unit 40 returns the process to step S52, The subsequent processing is repeated.
[0154]
In step S52, the reproduction time Tsv × Nv of the image annual ring data is less than the reproduction time Tsa × Na of the audio annual ring data, the reproduction time Tsl × Nl of the low-resolution annual ring data, and the reproduction time of the frame meta annual ring data. When it is determined that the time is equal to or less than all times of Tsm × Nm, that is, when the current timing is the timing at which the attention image annual ring data should be recorded, the control unit 40 proceeds to step S53 and performs data processing. It is determined whether image data is supplied from the conversion unit 39 to the memory 38 via the memory controller 37. If it is determined that image data is supplied, the process proceeds to step S54.
[0155]
In step S54, the control unit 40 determines whether or not the image data of the image signal necessary for reproduction corresponding to the image annual ring size Tsv × Nv has been stored in the memory 38, and the image corresponding to that image is still stored. If it is determined that the data is not stored in the memory 38, the process returns to step S52, and the subsequent processing is repeated. If it is determined in step S54 that image data corresponding to the reproduction time Tsv × Nv has been stored in the memory 38, the control unit 40 advances the process to step S55.
[0156]
In addition, when the data amount detection unit 62 of the data conversion unit 39 adds up and detects an image signal necessary for reproduction for the reproduction time Tsv × Nv, the data amount detection unit 62 notifies the memory controller 37 to that effect. Based on the notification, the memory controller 37 determines whether or not the image data necessary for reproduction for the reproduction time Tsv × Nv has been stored in the memory 38, and the determination result is sent to the control unit 40. Notice. That is, the control unit 40 performs the determination in step S54 based on the determination result from the memory controller 37. In this embodiment, the image data obtained by compressing and encoding the image signal is stored in the memory 38. However, the image signal is directly compressed as image data without being compressed and encoded. It can also be stored in the memory 38.
[0157]
In step S55, the control unit 40 controls the memory controller 37 so that the time as a physical recording / reproduction unit (physical unit region) formed on the optical disc 31 from the image data stored in the memory 38 is determined. Specifically, the data is extracted by reading from the previously input one, and the process proceeds to step S56. Note that the image annual ring data read from the memory 38 as the maximum amount of data that can be read from the memory 38 is an integer multiple of this sector, and the above-mentioned reproduction time Tsv × Nv or earlier. Recent image annual ring data.
[0158]
In step S56, the control unit 40 causes the memory controller 37 to supply the signal processing unit 36 with the attention image annual ring data having a data amount that is an integral multiple of the sector obtained in step S55, and thereby the integral multiple of that sector. Recording control is performed so that the annual ring data of the image of the data amount is recorded in an integral multiple of the number of sectors.
[0159]
In step S56, after performing the recording control of the attention image annual ring data as described above, the control unit 40 advances the process to step S57, increments the variable Nv by 1, returns the process to step S52, and thereafter. Repeat the process.
[0160]
On the other hand, when it is determined in step S53 that image data is not supplied to the memory 38, that is, when supply of image data from the data conversion unit 39 to the memory controller 37 is stopped, the control unit 40 performs step S58. By controlling the memory controller 37, all of the image data currently remaining in the memory 38 is read out, and the image data is converted into a minimum data amount that is an integral multiple of the sector. Add padding data for padding. As a result, the image data read from the memory 38 becomes image annual ring data having a data amount that is an integral multiple of the sector. Further, the control unit 40 supplies the image annulus data from the memory controller 37 to the signal processing unit 36, whereby the image annulus data having a data amount that is an integral multiple of the sector is transferred to the number of sectors that is an integral multiple of the sector. Recording control is performed so that recording is performed.
[0161]
The control unit 40 that has completed the process of step S58 advances the process to step S59, and the control unit 40 sets a value corresponding to infinity to the variable Nv, and ends the image data recording task.
[0162]
Next, the low resolution data recording task started in step S5 of FIG. 5 will be described with reference to the flowchart of FIG.
[0163]
When the low resolution data recording task is started, first, in step S71, the control unit 40 initializes a variable Nl that is incremented by 1 to 1, for example, in the process of step S77 described later, and proceeds to step S72.
[0164]
In step S72, the control unit 40 determines whether Tsl × Nl is less than Tsa × Na, and further whether Tsl × Nl is less than Tsv × Nv and less than or equal to Tsm × Nm.
[0165]
Here, Tsl × Nl is less than Tsa × Na, as in the case described in step S52 of FIG. 7, the attention low-resolution annual ring data which is the low-resolution annual ring data to be recorded is reproduced at the reproduction time Tsl. This is a condition for recording immediately after the voice annulus data in the latest playback time zone before × Nl is recorded. Also, Tsl × Nl is less than Tsv × Nv, as in the case described in step S52 in FIG. 7, the attention low-resolution annual ring data that is the low-resolution annual ring data to be recorded is reproduced at the reproduction time. This is a condition for recording immediately after the image annulus data of the latest reproduction time zone before Tsl × Nl is recorded.
[0166]
Further, Tsl × Nl is equal to or less than Tsm × Nm, as in the case of step S32 in FIG. 6, attention low-resolution annual ring data that is low-resolution annual ring data to be recorded, that is, reproduction time Tsl × Nl. Previously the latest low-resolution annulus data in the playback time zone (closest to the playback time Tsl × Nl) is immediately before the frame meta annulus data in the latest playback time zone before the playback time Tsl × Nl, that is, before the playback time Tsl × Nl. This is a condition for recording immediately after the frame meta annulus data of the second new playback time zone is recorded.
[0167]
In step S72, the reproduction time Tsl × Nl of the low-resolution annulus data is less than the reproduction time Tsa × Na of the audio annulus data, less than the reproduction time Tsv × Nv of the image annulus data, or less than the reproduction time Tsm × Nm of the frame meta annulus data. If it is determined that it is not one of them, that is, if the current timing is not a timing at which the current low-resolution annual ring data should be recorded, the control unit 40 returns the process to step S72 and repeats the subsequent processes.
[0168]
In step S72, the reproduction time Tsl × Nl of the low-resolution annulus data is less than the reproduction time Tsa × Na of the audio annulus data, and is less than the reproduction time Tsv × Nv of the image annulus data, and the frame meta annulus data. When it is determined that the reproduction time Tsm × Nm or less, that is, when the current timing is the timing at which the current low-resolution annual ring data should be recorded, the process proceeds to step S73, and the control unit 20 performs the data conversion unit 19 To determine whether low resolution data is supplied to the memory 18 via the memory controller 17, and if it is determined that the low resolution data is supplied, the process proceeds to step S74.
[0169]
In step S74, the control unit 40 determines whether or not the low resolution data necessary for reproduction corresponding to the low resolution annual ring size Tsl × Nl is stored in the memory 38, and the low resolution data corresponding to the low resolution annual ring size is still stored in the memory 38. If it is determined that it is not stored in 38, the process returns to step S72, and the same processing is repeated thereafter. If it is determined in step S74 that low resolution data corresponding to the reproduction time Tsl × Nl has been stored in the memory 38, the process proceeds to step S75.
[0170]
In addition, when the data amount detection unit 42 of the data conversion unit 39 detects the image signal and the audio signal necessary for reproduction for the total reproduction time Tsl × Nl, the data amount detection unit 42 notifies the memory controller 37 to that effect. Based on the notification, the memory controller 37 determines whether or not the low-resolution data necessary for reproduction for the reproduction time Tsl × Nl has been stored in the memory 38, and the determination result is sent to the control unit 40. Notice. Then, the control unit 40 performs a determination process in step S74 based on the determination result from the memory controller 37. In the present embodiment, the compression signal of the image signal or the like with a reduced amount of data such as an image signal is set as low resolution data. However, the image signal or the like with a reduced amount of data such as an image signal is also used. Can be used as low resolution data as they are.
[0171]
In step S75, the control unit 40 controls the memory controller 37 so that, for example, as a physical recording / reproducing unit (physical unit region) formed on the optical disc 31 from the low resolution data stored in the memory 38, The low-resolution data having the maximum data amount that can be read from the memory 38, which is an integral multiple (n times) of one sector, is extracted by reading it from the one input earlier in time. The process proceeds to step S76.
[0172]
Note that the low-resolution annual ring data read from the memory 38 as the low-resolution data having an integral multiple of the sector and the maximum data amount that can be read from the memory 38 is the above-mentioned reproduction time Tsl × Nl or earlier. This is recent low-resolution annual ring data.
[0173]
The low resolution data that has not been read in step S75 is left in the memory 38 as it is.
[0174]
In step S76, the control unit 40 causes the signal controller 36 to supply the attention low-resolution annual ring data having the data amount that is an integral multiple of the sector, obtained in step S75, from the memory controller 37. The recording control is performed so that the target low-resolution annual ring data of the data amount is recorded in an integral multiple of the number of sectors. As a result, the low-resolution annulus data having an amount of data that is an integral multiple of the sector is recorded so that the boundary of the low-resolution annulus data and the boundary of the sector of the optical disc 31 coincide with the number of sectors that is an integral multiple of the sector.
[0175]
Thereafter, the process proceeds to step S77, where the control unit 40 increments the variable Nl by 1, returns to step S72, and thereafter the same processing is repeated.
[0176]
On the other hand, when it is determined in step S73 that the low resolution data is not supplied to the memory 38, that is, when the supply of the low resolution data from the data conversion unit 39 to the memory controller 37 is stopped, the process proceeds to step S78, and the control unit 40 controls the memory controller 37 to read all of the low-resolution data currently remaining in the memory 38 and add padding data for padding so that the data amount becomes a minimum data amount that is an integral multiple of the sector. As a result, the low resolution data read from the memory 38 becomes low resolution annual ring data having a data amount that is an integral multiple of the sector. Further, the control unit 40 supplies the low-resolution annual ring data from the memory controller 37 to the signal processing unit 36, so that the low-resolution annual ring data having a data amount that is an integral multiple of the sector is transferred to the number of sectors that is an integral multiple of the sector. Recording control is performed so that recording is performed.
[0177]
Thereafter, the process proceeds to step S79, where the control unit 40 sets a value corresponding to infinity to the variable Nl, and ends the low resolution data recording task.
[0178]
Next, the frame metadata recording task started in step S6 of FIG. 5 will be described with reference to the flowchart of FIG.
[0179]
When the frame metadata recording task is started, first, in step S91, the control unit 40 initializes a variable Nl incremented by 1 to, for example, 1 in the process of step S97 described later, and proceeds to step S92. .
[0180]
In step S92, the control unit 40 determines whether Tsm × Nm is less than Tsa × Na, and further whether Tsm × Nm is less than Tsv × Nv and less than Tsl × Nl.
[0181]
Here, Tsm × Nm is less than Tsa × Na, as in the case described in step S52 of FIG. 7, the noticed frame meta annulus data that is the frame meta annulus data to be recorded is reproduced. This is a condition for recording immediately after the voice annulus data of the latest playback time zone before time Tsm × Nm is recorded. Also, Tsm × Nm is less than Tsv × Nv, as in the case described in step S22 of FIG. 8, the attention frame meta annulus data that is the frame meta annulus data to be recorded from now on, This is a condition for recording immediately after the image annulus data of the latest playback time zone before the playback time Tsm × Nm is recorded. Similarly, Tsm × Nm is less than Tsl × Nl because the frame meta annulus data, which is the frame meta annulus data to be recorded, is recorded in the low resolution of the latest reproduction time zone before the reproduction time Tsm × Nm. This is a condition for recording immediately after the annual ring data is recorded.
[0182]
In step S92, the reproduction time Tsm × Nm of the frame meta annulus data is less than the reproduction time Tsa × Na of the audio annulus data, less than the reproduction time Tsv × Nv of the image annulus data, or less than the reproduction time Tsl × Nl of the frame meta annulus data. If it is determined that the current timing is not the timing for recording the target frame meta annual ring data, the process returns to step S92, and the same processing is repeated thereafter.
[0183]
In step S92, the reproduction time Tsm × Nm of the frame meta annulus data is less than the reproduction time Tsa × Na of the audio annulus data, and is less than the reproduction time Tsv × Nv of the image annulus data, and the low-resolution annulus data. When it is determined that the reproduction time is less than Tsl × Nl, that is, when the current timing is a timing at which the attention frame meta annual ring data should be recorded, the process proceeds to step S93, where the control unit 40 It is determined whether or not frame metadata is supplied from the memory 39 to the memory 38 via the memory controller 37. If it is determined that the frame metadata is supplied, the process proceeds to step S94.
[0184]
In step S94, the control unit 40 determines whether or not the frame metadata necessary for reproduction corresponding to the frame meta annual ring size Tsm × Nm has been stored in the memory 38, and the frame meta for that amount is still stored. If it is determined that the data is not stored in the memory 38, the process returns to step S92, and the same processing is repeated thereafter. If it is determined in step S94 that frame metadata corresponding to the reproduction time Tsm × Nm has been stored in the memory 38, the process proceeds to step S95.
[0185]
In addition, when the data amount detection unit 62 of the data conversion unit 39 detects the image signal and the audio signal necessary for the reproduction for the reproduction time Tsm × Nm in total, it notifies the memory controller 37 to that effect. Based on the notification, the memory controller 37 determines whether or not the frame metadata necessary for playback corresponding to the playback time Tsm × Nm has been stored in the memory 38, and the determination result is sent to the control unit 40. Notify Then, the control unit 40 performs the determination process in step S94 based on the determination result from the memory controller 37.
[0186]
In step S95, the control unit 40 controls the memory controller 37, and from the frame metadata stored in the memory 38, as a physical recording / reproducing unit (physical unit region) formed on the optical disc 31. For example, the maximum amount of metadata that can be read from the memory 38, which is an integer multiple (n times) of one sector, is extracted by reading it from the one input earlier in time. Then, the process proceeds to step S96.
[0187]
Note that the frame meta annual ring data read out from the memory 38 as the frame meta data having a data amount that is an integral multiple of this sector and can be read out from the memory 38 is the reproduction time Tsm × Nm described above. It is the previous recent frame meta annual ring data.
[0188]
Further, the frame metadata that has not been read in step S95 is left in the memory 38 as it is.
[0189]
In step S96, the control unit 40 causes the memory controller 37 to supply the signal processing unit 36 with the target meta annual ring data having an amount of data that is an integral multiple of the sector obtained in step S95. The recording control is performed so that the target frame meta annual ring data of the data amount is recorded in an integral number of sectors. As a result, the meta annulus data having an amount of data that is an integral multiple of the sector is periodically recorded so that the boundary of the frame meta annulus data and the boundary of the sector of the optical disc 31 coincide with the number of sectors that is an integral multiple of the sector. Is done.
[0190]
Thereafter, the process proceeds to step S97, where the control unit 40 increments the variable Nm by 1, returns to step S92, and thereafter the same processing is repeated.
[0191]
On the other hand, if it is determined in step S93 that the frame metadata is not supplied to the memory 38, that is, if the supply of the frame metadata from the data conversion unit 39 to the memory controller 37 is stopped, the process proceeds to step S98. The control unit 40 controls the memory controller 37 to read all the frame metadata currently remaining in the memory 38, and the frame metadata so that the data amount becomes a minimum data amount that is an integral multiple of the sector. To the padding data for padding. As a result, the frame metadata read from the memory 38 becomes frame meta annulus data having a data amount that is an integral multiple of the sector. Further, the control unit 40 supplies the frame meta annulus data from the memory controller 37 to the signal processing unit 36, so that the frame meta annulus data having an amount of data that is an integral multiple of the sector has an integer multiple of the frame meta annulus data. Recording control is performed so that the data is recorded in the sector.
[0192]
Thereafter, the process proceeds to step S99, where the control unit 40 sets a value corresponding to infinity to the variable Nm, and ends the frame metadata recording task.
[0193]
As described above, the frame metadata includes, for example, data such as LTC, user bits, UMID, essence mark, ARIB metadata, or setting / control information of the video camera on which imaging has been performed.
[0194]
As shown in FIG. 10, these data are KLV-encoded data (hereinafter referred to as KLV data) composed of key data (Key) 111, length data (Length) 112, and value data (Value) 113. ). This format conforms to SMPTE 335M / RP214.
[0195]
The key data 111 of the KLV data 110 is an identifier indicating a KLV-encoded data item. As this identifier, identifiers corresponding to various data items defined in the SMTPE metadata dictionary are used. The length data 112 of the KLV data 110 is data indicating the length of the value data 113 in units of bytes. The value data 113 of the KLV data 110 is data including a data body such as text data such as an XML (eXtensible Markup Language) document. That is, the KLV data 110 is data of the data item indicated by the key data 111, is data having a data length indicated by the length data 112, and is obtained by encoding the data indicated by the value data 113.
[0196]
The frame metadata is composed of the various data described above, which is KLV data having such a data structure. The frame metadata composed of the plurality of data is roughly divided into two parts, an essential part and a selection part, from the contents of each data. The required part is the data included in the frame metadata corresponding to all frames, and is composed of various data including LTC, user bits, UMID, and other KLV data such as essence marks, and the selected part is required Accordingly, it is composed of data included in the frame metadata. Examples of data included in the selected portion include data such as ARIB metadata and video camera setting / control information.
[0197]
The data lengths of the essential part and the selection part are both fixed lengths determined in advance. In addition, since the frame metadata needs to be data that requires real-time properties in order to support data transfer through a synchronous communication interface such as SDI, the frame metadata can be written to and read from the optical disc 31 and the like at high speed. The essential part (and selection part) is composed of one file in BIM (BInary Format for MPEG-7) format.
[0198]
Here, the BIM format data is obtained by converting XML format data into binary data. Various data included in the frame metadata described above can also be expressed in XML. However, since the amount of data increases in the case of XML, it is not suitable for frame metadata in which it is desirable to shorten the reading and writing time (requires real-time property). Therefore, the real-time property of frame metadata can be realized by using BIM, which is a binary representation having information equivalent to the XML representation. By using BIM format data for the frame metadata, not only the data area in the optical disc 31 necessary for recording the frame metadata can be reduced, but also the writing time and the reading time can be reduced. It is also possible to reduce the storage area in the memory that holds data during the writing and reading processes, and the overall processing speed of writing and reading can be improved.
[0199]
As described above, the control unit 40 controls the frame metadata processing unit 66, and is supplied to the frame metadata processing unit 66 via the data amount detection unit 62. The frame metadata including the KLV data as described above. Are recorded on the optical disk 31 via the memory controller 37.
[0200]
However, for example, when an image signal or an audio signal is input from a video camera (not shown) used for imaging to the disk recording / reproducing device (disk device) 30 via the signal input / output device 51, that is, When an image signal or audio signal obtained by imaging is supplied to the disc recording / reproducing apparatus 30 without adding metadata, metadata such as LTC is added to the image signal and audio signal. Absent. For example, when the disc recording / reproducing apparatus 30 is integrated with a video camera, the image signal and audio signal obtained by imaging are not subjected to processing such as adding frame metadata or the like to the data conversion unit 39. Supplied.
[0201]
In such a case, the control unit 40 controls the frame metadata processing unit 66 of the data conversion unit 39, and the LTC data generation unit 71 generates LTC data in the LTC data processing unit 71 built in the frame metadata processing unit 66. Is executed.
[0202]
The control unit 101 of the LTC data processing unit 71 executes the LTC data generation processing. When the frame metadata processing unit 66 controlled by the control unit 40 instructs generation of LTC data, the signal input / output device 51 LTC data is generated in synchronization with the frame of the image signal supplied to the data conversion unit 39 and supplied to the frame metadata processing unit 66.
[0203]
With reference to the flowchart in FIG. 11, the LTC data generation processing by the control unit 101 of the LTC data processing unit 71 will be described.
[0204]
First, in step S111, the control unit 101 determines whether or not an instruction to start LTC data generation has been acquired from the frame metadata processing unit 66, and waits until it is determined that it has been acquired.
[0205]
If it is determined that the LTC data generation start instruction has been acquired, the control unit 101 proceeds to step S112 to determine whether or not to generate LTC using real time.
[0206]
The generation of LTC data may be performed using an actual time or may be performed using a predetermined initial value. For example, the control unit 40 does not use such information received via the operation unit 41, that is, information that indicates whether or not to generate LTC data using the actual time, and further does not use the actual time. When generating LTC data, information indicating whether or not an initial value has been set is supplied to the frame metadata processing unit 66 of the data conversion unit 39.
[0207]
The frame metadata processing unit 66 supplies the information to the control unit 101 of the LTC data processing unit 71 together with an instruction to start LTC data generation. In step S112, the control unit 101 determines whether to generate an LTC using an actual time (real time) based on the supplied information.
[0208]
If it is determined in step S112 that the LTC using the real time is generated, the control unit 101 advances the process to step S113, and controls the LTC generation unit 102 and the real time clock 105 as described above, thereby generating the real time clock. Used to generate LTC data according to the synchronization signal.
[0209]
That is, the control unit 101 supplies a synchronization signal to the real-time clock 105, and causes the LTC generation unit 102 to supply information related to real-time according to the synchronization signal. Further, the control unit 101 supplies a synchronization signal to the LTC generation unit 102, synchronizes the operation of the LTC generation unit 102 with the synchronization signal, and generates LTC data based on real-time information supplied from the real-time clock 102. .
[0210]
When the process of step S113 ends, the control unit 101 proceeds to step S114, controls the LTC generation unit 102, and supplies the generated LTC data to the frame metadata processing unit 66, thereby supplying it to the memory controller 37. Let That is, the frame metadata processing unit 66 supplies the LTC data supplied from the LTC data processing unit 71 to the memory controller 37 as frame metadata.
[0211]
In step S115, the control unit 101 that has supplied the LTC data determines whether or not an instruction to end the LTC data generation supplied from the frame metadata processing unit 66 has been obtained in the same manner as the control signal and the synchronization signal described above. . The control unit 40 supplies an instruction to end LTC data generation to the frame metadata processing unit 66 of the data conversion unit 39 based on a user instruction or the like input via the operation unit 41. When the frame metadata processing unit 66 acquires an instruction to end LTC data generation, the frame metadata processing unit 66 supplies the instruction to the control unit 101 of the LTC data processing unit 71. In step S115, the control unit 101 determines whether or not the instruction has been acquired.
[0212]
In step S115, when it is determined that the LTC data generation end instruction has not been acquired, the control unit 101 returns the process to step S113 and repeats the subsequent processes. If it is determined that an instruction to end LTC data generation has been acquired, the control unit 101 ends the LTC data generation process.
[0213]
By the way, when it determines with producing | generating LTC without using real time in step S112, the control part 101 advances a process to step S116, and based on the information acquired from the frame metadata process part 66 as mentioned above, initial stage is carried out. It is determined whether a value setting is instructed.
[0214]
If it is determined that the setting of the initial value is instructed, the control unit 101 advances the process to step S117, controls the initial value setting unit 103, and sets the initial value of LTC to the instructed value. That is, in this case, the control unit 101 supplies the initial value setting unit 103 with information (instructed initial value) related to the instruction of the initial value, and causes the initial value of the LTC to be set to that value. The initial value setting unit 103 supplies the set initial value to the LTC generation unit 102. When the setting of the initial value is completed, the control unit 101 advances the process to step S119.
[0215]
If it is determined in step S116 that the initial value setting is not instructed, the control unit 101 advances the process to step S118, controls the initial value setting unit 103, and sets the initial value of the LTC to “0”. Set. That is, in this case, the control unit 101 supplies information of the value “0” to the initial value setting unit 103 and causes the initial value of LTC to be set to “0”. The initial value setting unit 103 supplies the set initial value to the LTC generation unit 102. When the setting of the initial value is completed, the control unit 101 advances the process to step S119.
[0216]
In step S119, the control unit 101 controls the LTC generation unit 102 and the counter 104, and uses the counter 104 to generate LTC data in accordance with the synchronization signal. That is, the counter 104 performs a count process in accordance with the synchronization signal supplied from the control unit 101, and sequentially supplies the calculated count value to the LTC generation unit 102. The LTC generation unit 102 operates in synchronization with the synchronization signal supplied from the control unit 101, and uses the initial value supplied from the initial value setting unit 103 and the counter value supplied from the counter 104 to generate LTC data. Generate.
[0217]
The control unit 101 that has completed the process of step S119 controls the LTC generation unit 102 in step S120 to supply the generated LTC data to the frame metadata processing unit 66, thereby causing the memory controller 37 to supply it. That is, the frame metadata processing unit 66 supplies the LTC data supplied from the LTC data processing unit 71 to the memory controller 37 as frame metadata.
[0218]
The control unit 101 to which the LTC data has been supplied determines whether or not the instruction to end the LTC data generation supplied from the frame metadata processing unit 66 has been acquired in step S121, as in the case of the process of step S115. . The control unit 40 supplies an instruction to end LTC data generation to the frame metadata processing unit 66 of the data conversion unit 39 based on a user instruction or the like input via the operation unit 41. When the frame metadata processing unit 66 acquires an instruction to end LTC data generation, the frame metadata processing unit 66 supplies the instruction to the control unit 101 of the LTC data processing unit 71. In step S121, the control unit 101 determines whether or not the instruction has been acquired.
[0219]
In step S121, when it is determined that the LTC data generation end instruction has not been acquired, the control unit 101 returns the process to step S119 and repeats the subsequent processes. If it is determined that an instruction to end LTC data generation has been acquired, the control unit 101 ends the LTC data generation process.
[0220]
The LTC data generated and supplied to the memory controller 37 as described above is processed as frame metadata as described above, and is recorded on the optical disc 31 together with the audio data and the image data.
[0221]
By recording the LTC data generated as described above together with the essence data as frame metadata, the user can perform editing processing more easily during editing, as will be described later.
[0222]
Note that the frame metadata processing unit 66 not only supplies the LTC data acquired from the LTC data processing unit 71 or the data amount detection unit 62 to the memory controller 37 but also supplies it to the clip metadata processing unit 67. The clip metadata processing unit 67 supplies the acquired LTC data to the built-in LTC data processing unit 72. Further, the clip metadata processing unit 67 supplies a control signal and a synchronization signal supplied from the control unit 40 to the LTC data processing unit 72. When the LTC data processing unit 72 performs LTC data processing based on the control signal and the synchronization signal supplied from the clip metadata processing unit 67 and acquires the LTC data, the LTC data processing unit 72 uses the LTC data as the clip metadata. Generate a conversion table.
[0223]
With reference to FIG. 12, the LTC data processing by the LTC data processing unit 72 will be described. Moreover, it demonstrates with reference to FIG. 13 as needed.
[0224]
In step 141, the LTC data processing unit 72 determines whether or not LTC data has been acquired from the clip metadata processing unit 67. If it is determined that the LTC data processing unit 72 has acquired the LTC data processing unit 72, the process proceeds to step S142. It is determined whether or not the retained LTC data exists (not shown).
[0225]
When it is determined that the LTC data has been acquired for the first time this time, the LTC data has not been acquired before, and the LTC data is not stored in the built-in storage unit, the LTC data processing unit 72 performs the process in step S143. Go ahead and register the LTC data acquired this time in the conversion table as a starting point.
[0226]
As shown in FIG. 13A, the conversion table is a table for associating LTC data with a frame number corresponding to the LTC data. The conversion table is generated by the LTC data processing unit 72 and stored in the LTC data processing unit 72 (not shown). Held in the department. In FIG. 13A, the conversion table 120 includes an LTC 121 composed of LTC data, a frame number 122 of a frame corresponding to the LTC data, and a type 123 indicating the type of the point.
[0227]
The LTC data processing unit 72 calculates a frame number corresponding to the supplied LTC data based on the supplied synchronization signal, and stores the LTC data and the frame number in the storage unit in association with information indicating the start point. As a result, the LTC data is registered in the conversion table.
[0228]
For example, in the case of FIG. 13A, the LTC121 is “10: 00: 00: 00” and the frame number 122 is “0” in the second number “1” from the top of the conversion table 120. Points whose type 123 is “start point” are registered. That is, this stage of the conversion table 120 indicates that the LTC data of the frame with the frame number “0” is “10: 00: 00: 00” and is the “starting point” of the LTC data.
[0229]
The LTC data processing unit 72 registered in the conversion table with the LTC data as the starting point advances the processing to step S144, erases the LTC data acquired last time and stored in the storage unit, and stores the LTC data acquired this time in the storage unit. Hold on.
[0230]
Then, the LTC data processing unit 72 proceeds to step S145, determines whether or not to end the LTC data processing based on the supplied control signal, and determines that the processing is to be ended. After execution, the LTC data processing is terminated.
[0231]
By the way, when it determines with not complete | finishing a LTC data process in step S145, the LTC data process part 72 returns a process to step S141, and repeats the process after it.
[0232]
If it is determined in step S142 that the stored LTC data exists in the storage unit, the LTC data processing unit 72 proceeds to step S147, and the value of the LTC data acquired this time is acquired and stored last time. It is determined whether or not it is continuous with the value of the LTC data held in the section.
[0233]
For example, when an edited signal obtained by combining a plurality of clips to which independent LTCs are added is supplied to the data conversion unit 39, as shown in FIG. It is supplied to the LTC data processing unit 72. FIG. 13B is a diagram illustrating an example of the relationship between LTC and FTC, where the horizontal axis indicates the number of frames (FTC) and the vertical axis indicates seconds (LTC). For example, assuming that a signal having an image of 30 frames per second and having a relationship between FTC and LTC as shown by a curve 131 is supplied to the data converter 39, LTC data included in the signal is included. Is continuously increased from frame number “0” to “24”, but LTC is “1 second” at frame number “25”.
[0234]
Thus, when it determines with the increase in the value of LTC data not continuing, the LTC data processing part 72 advances a process to step S148, and registers into the conversion table the LTC data acquired this time as a change point.
[0235]
In the case of FIG. 13A, the LTC 121 is “10: 00: 01: 00” and the frame number 122 is “25” as shown in the third row (number “2”) from the top of the conversion table 120. Points whose type 123 is “change point” are registered. That is, this stage of the conversion table 120 indicates that the LTC data of the frame with the frame number “25” is “10: 00: 01: 00”, which is the “change point” of the LTC data.
[0236]
The LTC data processing unit 72 that has registered the LTC data in the conversion table returns the processing to step S144 and repeats the subsequent processing.
[0237]
If it is determined in step S147 that the value of the LTC data acquired this time is continuous with the value of the LTC data acquired last time (in the case of FIG. 13B, a frame other than the frame number “25”), the LTC The data processing unit 72 returns the process to step S144 and repeats the subsequent processes.
[0238]
By the way, when it determines with not having acquired LTC data in step S141, the LTC data processing part 72 advances a process to step S149, determines whether the supply of LTC data was complete | finished, and is not complete | finished. If it is determined, the process returns to step S145, and the subsequent processes are repeated.
[0239]
If it is determined in step S149 that the supply of LTC data has been completed, the LTC data processing unit 72 proceeds to the process in step S150, registers the last acquired LTC data as an end point in the conversion table, and holds it. Erase LTC data.
[0240]
In the case of FIG. 13A, the LTC 121 is “12: 34: 56: 78”, the frame number 122 is “300000”, as shown in the first row (number “n”) from the bottom of the conversion table 120. Points whose type 123 is “end point” are registered. That is, this stage of the conversion table 120 indicates that the LTC data of the frame with the frame number “300000” is “12: 34: 56: 78”, which is the “end point” of the LTC data.
[0241]
The LTC data processing unit 72 that has finished the process of step S150 returns the process to step S146, executes the end process, and then ends the LTC data process.
[0242]
As described above, the generated conversion table is supplied to the memory controller 37 as clip metadata by the clip metadata processing unit 67, and is recorded and controlled by the control unit 40 as described with reference to the flowchart of FIG. It is recorded on the optical disc 31.
[0243]
According to the recording process of FIG. 5, the audio data recording task of FIG. 6, the image data recording task of FIG. 7, the low resolution data recording task of FIG. 8, and the frame metadata recording task of FIG. The image annual ring data, the low resolution annual ring data, the frame meta annual ring data, and the clip meta data are recorded on the optical disc 31 as shown in FIG.
[0244]
That is, as described above, the sound annulus data, the image annulus data, the low-resolution annulus data, and the frame meta annulus data in the same playback time zone are as follows. Are recorded at a position before the optical disc 31 in the order of priorities.
[0245]
Further, for example, when considering the voice annual ring data having the highest priority as a reference, if voice annual ring data in a certain playback time zone is recorded, the playback time similar to that playback time zone is followed by the voice annual ring data. Image annual ring data, low-resolution annual ring data, and frame meta annual ring data are recorded.
[0246]
From the above, as shown in FIG. 14, the order of the audio annual ring data 141, the image annual ring data 142, the low-resolution annual ring data 143, and the frame meta annual ring data 144 is repeated from the inner peripheral side to the outer peripheral side of the optical disc 31. To be recorded.
[0247]
Then, clip metadata 145 that does not require real-time property is recorded in an area different from the above-described annual ring data.
[0248]
Note that the relationship between the sound annulus size Tsa, the image annulus size Tsv, the low-resolution annulus size Tsl, and the frame meta annulus size Tsm may be any relationship. The audio annulus size Tsa, the image annulus size Tsv, and the low-resolution image As described above, the annual ring size Tsl and the frame meta annual ring size Tsm can all be set to the same time, or can be set to different times. Further, the low-resolution annual ring size Tsl and the frame meta annual ring size Tsm may of course be twice the audio annual ring size Tsa and the image annual ring size Tsv.
[0249]
Also, the audio annual ring size Tsa, the image annual ring size Tsv, the low resolution annual ring size Tsl, and the frame meta annual ring size Tsm can be set in accordance with, for example, the use and purpose of use of the optical disc 31. That is, the low resolution annual ring size Tsl and the frame meta annual ring size Tsm can be larger than, for example, the audio annual ring size Tsa and the image annual ring size Tsv.
[0250]
Note that the clip metadata 145 may be recorded at any position on the optical disc 31. For example, as shown in FIG. 15A, the clip metadata 145 may be recorded between annual ring data. In the case of FIG. 15A, after a plurality of annual ring data 150 consisting of audio annual ring data 151, image annual ring data 152, low-resolution annual ring data 153, and frame meta annual ring data 154 is recorded, clip metadata 161 is recorded. Other annual ring data are subsequently recorded.
[0251]
As described with reference to the flowchart of FIG. 5, the clip metadata is recorded after the audio data recording task, the image data recording task, the low resolution data recording task, and the frame metadata recording task are completed. Therefore, at this timing, the clip metadata 161 is recorded after the last recorded annual ring data 150, and the annual clip data recorded in the recording process started next is the last clip that has been recorded. It is recorded so as to follow the metadata 161.
[0252]
At this time, the frame meta annual ring data 154 includes the LTC 155 corresponding to the audio annual ring data 151 and the image annual ring data 152 included in the same annual ring data. Therefore, the LTC 155 is recorded in the vicinity of the audio annulus data 151 and the image annulus data 152 corresponding to the LTC 155, and the LTC 155 is read when the audio annulus data 151 and the image annulus data 152 included in the annulus data 150 are reproduced. The seek time can be shortened, and the reading speed of the LTC155 can be improved.
[0253]
Further, the clip metadata 161 corresponds to the LTC included in the annual ring data recorded immediately before from the first annual ring data or the annual ring data recorded next to the clip metadata recorded immediately before. A conversion table 162 is included. Therefore, the conversion table 162 is recorded in the vicinity of the sound annulus data 151 and the image annulus data 152 corresponding to the conversion table 162 to some extent (compared to the case of FIG. 15B described later). The metadata included in the clip metadata 161 is basically metadata that does not require real-time property. For example, when the user instructs the playback of a specific frame using the conversion table 162, the audio annual ring data to be played back It is preferable that 151 and image annulus data 152 are recorded in the vicinity of conversion table 162 because the seek time can be shortened and the reading speed of audio annulus data 151 and image annulus data 152 can be improved. .
[0254]
Note that, for example, as shown in FIG. 15B, the clip metadata may be recorded together in an area different from the area where the annual ring data is stored. In the case of FIG. 15B, annual ring data 170-1, voice annual ring data 171-2, image annual ring data 172-1, low-resolution annual ring data 173-1, and frame meta annual ring data 174-1, audio annual ring data 171-2, image Clip metadata 181-is recorded in an area different from the area where the annual ring data is recorded, such as annual ring data 170-2 consisting of annual ring data 172-2, low-resolution annual ring data 173-2, and frame meta annual ring data 174-2. 1, clip metadata is collectively recorded as clip metadata 181-2 and clip metadata 181-3.
[0255]
In this case, as described with reference to the flowchart of FIG. 5, the clip metadata includes the annual ring data after the audio data recording task, the image data recording task, the low resolution data recording task, and the frame metadata recording task. Is recorded in a separate area.
[0256]
Therefore, the conversion tables 182-1 to 182-3 included in the clip metadata 181-1 to 181-3, respectively, are recorded in the vicinity of each other. Therefore, when searching for a specific frame using a plurality of conversion tables, seek time can be shortened, and the target frame can be searched at high speed.
[0257]
Also, when audio data or image data is played back, there is no clip metadata unnecessary for playback between the data, so the read time can be shortened and the playback process can be speeded up. .
[0258]
Further, the clip metadata is composed of metadata that does not require real-time property, and normally there is no need to consider the seek time. Therefore, how is the physical position of the storage area of the optical disc 31? For example, one clip metadata may be distributed and recorded at a plurality of positions.
[0259]
In the above description, the start point, the change point, and the end point of the LTC are registered as the conversion table. However, the present invention is not limited thereto. For example, the LTC may be registered at predetermined intervals. Good. As the number of registered LTCs in the conversion table increases, the time for calculating the frame number of the requested frame can be shortened when searching for a frame. However, the data size of the conversion table increases, and the entire search process Time may be extended. Therefore, it is desirable to select the LTC used for the conversion table so that the size of the conversion table is appropriate.
[0260]
As described above, LTC is recorded as frame metadata along with essence data consisting of audio data, image data, etc., and a conversion table consisting of LTC start point, change point, end point, etc. is recorded as clip metadata. Therefore, when editing the data recorded on the optical disc 31 described above, the user can easily perform the editing process based on the LTC, and search for and reproduce the target frame from the LTC. You can also.
[0261]
With reference to FIGS. 16 and 17, a specific example in the case of editing using LTC will be described.
[0262]
In the imaging / recording / editing system shown in FIG. 16, three cameras (camera A, camera B, and camera C) connected to the central control processing unit 201 incorporating the disc recording / reproducing apparatus (disc apparatus) 30 shown in FIG. Thus, the subject 202 is imaged. The subject 202 is making a presentation, for example, and the cameras A to C each capture the state of the presentation and supply the obtained image signal and audio signal to the central control processing device 201. Each user of the cameras A to C operates the cameras A to C independently of each other, and images the subject 202 or stops imaging. The central control processing unit 201 is connected to a real-time clock 203 indicating actual time, and information related to real-time (actual time) is supplied from the real-time clock 203.
[0263]
The central control processing unit 201 supplied with the image signal and the audio signal from the cameras A to C receives a real-time clock for each supplied image signal and audio signal in the built-in disc recording / reproducing device (disk device) 30. Based on the real-time information supplied from 203, LTC is added and the data is recorded on a recording medium such as an optical disk.
[0264]
In the case of such a system, the central control processor 201 records clip data composed of audio data, image data, low resolution data, frame metadata, and clip metadata as shown in FIG. The In FIG. 17, the recording media include clips A-1 to A-3 obtained by the camera A, clips B-1 to B-3 obtained by the camera B, and clips C-1 obtained by the camera C. And clip data such as C-2 are recorded.
[0265]
When editing such that the clip data obtained by such cameras A to C are combined to generate one program, the LTC is displayed on the display together with the image corresponding to the image data. Each clip can be arranged on a time series as shown in FIG. 17 using LTC (real time supplied from the real time clock 203) included in each clip data. Therefore, for example, the editor can specify that the clips obtained at the time “13: 00: 00: 00” are the clip A-3, the clip B-3, and the clip C-2. Furthermore, it is possible to easily identify the frame.
[0266]
Therefore, for example, when the image to be selected as the adopted take is switched from the frame of the clip A-3 to the frame of the clip B-3 at the time “13: 00: 00: 00”, the editor The timing (frame) for switching the clip B-3 can be accurately and easily grasped.
[0267]
Also, the editor can easily and quickly search for the target frame from the LTC using the clip metadata conversion table.
[0268]
A read process executed by the control unit 40 when reproducing information recorded on the optical disk 31 in the disk recording / reproducing apparatus (disk apparatus) 30 will be described with reference to the flowchart of FIG.
[0269]
In step S161, the control unit 40 that has received a user instruction via the operation unit 41 and started the reading process, first, in step S161, based on the acquired instruction from the user, the control unit 40 performs a reading start frame. Whether or not is instructed is determined.
[0270]
As a data reading method (reproducing method), a method of reading sequentially from the first frame of image data recorded on the optical disc 31, a method of designating a reading start frame using LTC, and a frame number (FTC) are used. There is a method for designating a reading start frame. When designating the readout start frame, the user designates the clip and the LTC included in the clip, or designates the frame number (FTC) of the clip and the frame contained in the clip. The user instructs to start the reading process via the operation unit 41, and selects and instructs one of these methods.
[0271]
When it is determined that the readout start frame is instructed by the instruction, the control unit 40 advances the processing to step S162 and determines whether or not the instruction of the start frame is an instruction by LTC. If it is determined that the instruction is based on LTC, the control unit 40 proceeds to step S163 to search for the metadata of the specified clip and read the conversion table included in the clip metadata from the optical disc 31. The spindle motor 32 and the pickup unit 33 are controlled via the servo control unit 35. The conversion table read from the optical disc 31 is supplied to and held in the memory 38 via the pickup unit 33, the RF amplifier 34, the signal processing unit 36, and the memory controller 37. Note that the read conversion table may be supplied to the control unit 40 and held in a storage unit (not shown) built in the control unit 40.
[0272]
The control unit 40 that has read the conversion table from the optical disc 31 proceeds to step S164, and calculates the frame number of the frame corresponding to the LTC at the instructed time using the read conversion table.
[0273]
In step S165, the control unit 40 determines whether or not the target frame specified as the read start frame exists in the specified clip, based on the calculation result in the process of step S164. If the frame number corresponding to the LTC can be normally calculated by the process of step S164 and it is determined that the target frame exists, the control unit 40 advances the process to step S166, and the disk recording / reproducing apparatus (disk apparatus). The frame number of the target frame using a file system such as UDF (Universal Disk Format) or ISO9660 (International Organization for Standardization 9660) for managing the data recorded on the optical disc 31 employed in No. 30 The readout control processing is performed by controlling each unit so as to start readout from image data and audio data corresponding to the above.
[0274]
When the data reading (reproduction process) is completed, the control unit 40 ends the process of step S166 and ends the reading process.
[0275]
In the process of step S164, the designated LTC time is not included in the LTC range in the read conversion table, and the frame number corresponding to the designated LTC cannot be normally calculated. If it is determined that the target frame does not exist, the control unit 40 performs an error process, omits the process of step S166, and ends the read process.
[0276]
If it is determined in step S162 that the user has designated a read start frame using the frame number (FTC) (not an instruction by LTC), the control unit 40 omits the processes of steps S163 to S165, The process proceeds to S166, and as described above, the read control process is performed based on the frame number.
[0277]
If it is determined in step S161 that the read start frame is not instructed by the user, the control unit 40 advances the process to step S167 and uses the file system that manages the data on the optical disc 31 to determine the first frame. Read control is performed so that reading starts from data corresponding to the frame number.
[0278]
When the data reading (reproducing process) is completed, the control unit 40 ends the process of step S167 and ends the reading process.
[0279]
As described above, the control unit 40 searches for a reading start frame designated by the user using LTC using the conversion table included in the clip metadata, and starts reading (reproduction processing) from that frame. Therefore, the user can easily specify the reading position (frame) using the LTC. Thereby, the user can also reduce the burden of editing work.
[0280]
Actually, in addition to the above, there are various playback operation methods such as fast-forward playback, rewind playback, pause, frame-by-frame playback, and the like. ) And the read control may be performed so as to perform the reproducing operation, and the description thereof is omitted.
[0281]
The file system has been described as UDF or ISO9660, but is not limited to this, and any file system may be used, or a dedicated file system may be used. For example, when a magnetic disk such as a hard disk is used instead of the optical disk 31, the file system is FAT (File Allocation Tables), NTFS (New Technology File System), HFS (Hierarchical File System), or UFS (Unix ( (Registered trademark) File System) may be used.
[0282]
As described above, LTC data is added as frame metadata to essence data such as image data and audio data, and a conversion table of LTC and frame number is added as clip metadata and recorded on a recording medium. By doing so, it is possible to improve the convenience of the recording medium, such as enabling editing processing more easily.
[0283]
In the above description, the metadata that requires real-time property is described as frame metadata that is metadata for each frame. However, the present invention is not limited to this, and metadata for any unit of essence data is used. For example, it may be metadata for a plurality of frames.
[0284]
Further, the metadata that does not require real-time property has been described as clip metadata that is metadata for each clip. However, the present invention is not limited to this, and metadata for any unit of essence data may be used. For example, it may be metadata for each of a plurality of clips, or may be metadata for essence data for a predetermined time. Furthermore, the timing at which the clip metadata as metadata that does not require real-time property is recorded on the optical disc 31 may be any timing. For example, as described with reference to the flowchart of FIG. 5, clip metadata may be recorded immediately after a recorded clip ends (immediately after one imaging operation ends) The recording may be performed immediately before the recording of the next clip is started (immediately before the next imaging operation is started), or may be recorded at a predetermined time independently of the recording timing of the essence data. Of course it is good.
[0285]
In the above description, the case where image data, audio data, low resolution data, frame metadata, clip metadata, and the like are recorded on an optical disc has been described. However, as a recording medium for recording these data, an optical disc is used. For example, it may be a magneto-optical disk, a magnetic disk such as a flexible disk or a hard disk, a magnetic tape, or a semiconductor memory such as a flash memory.
[0286]
The series of processes described above can be executed by hardware, or can be executed by software as described above. When a series of processing is executed by software, various functions can be executed by installing a computer in which the programs that make up the software are installed in dedicated hardware, or by installing various programs. For example, it is installed from a recording medium or the like into a general-purpose personal computer or the like.
[0287]
FIG. 19 is a diagram illustrating an internal configuration example of a personal computer that executes such processing.
[0288]
A CPU (Central Processing Unit) 301 of the personal computer 300 executes various processes according to a program stored in a ROM (Read Only Memory) 302. A RAM (Random Access Memory) 303 appropriately stores data and programs necessary for the CPU 301 to execute various processes.
[0289]
The CPU 301, ROM 302, and RAM 303 are connected to each other via a bus 304. An input / output interface 310 is also connected to the bus 304.
[0290]
The input / output interface 310 is connected to an input unit 311 including a keyboard and a mouse, and outputs a signal input to the input unit 311 to the CPU 301. The input / output interface 310 is also connected to an output unit 312 including a display and a speaker.
[0291]
Furthermore, a storage unit 313 configured from a hard disk or the like and a communication unit 314 that performs data communication with other devices via a network such as the Internet are connected to the input / output interface 310. The drive 315 is used when data is read from or written to a removable medium 321 formed of a recording medium such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.
[0292]
As shown in FIG. 19, the recording medium is distributed to provide a program to the user separately from the personal computer, and includes a magnetic disk (including a flexible disk) on which the program is recorded, an optical disk (CD-ROM). (Including compact disc-read only memory), DVD (digital versatile disc), magneto-optical disc (including MD (mini-disc) (registered trademark)), or removable media 321 including package media such as semiconductor memory And a hard disk including a ROM 302 storing a program and a storage unit 313 provided to a user in a state of being pre-installed in a computer.
[0293]
In this specification, the steps for describing the program provided by the medium are performed in parallel or individually in accordance with the described order, as well as the processing performed in time series, not necessarily in time series. The process to be executed is also included.
[0294]
Further, in this specification, the system represents the entire apparatus constituted by a plurality of apparatuses.
[0295]
【The invention's effect】
As described above, according to the present invention, image data, audio data, and the like can be recorded on a recording medium. In particular, it is possible to improve the convenience of the recording medium, such as enabling editing processing more easily.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a conventional LTC or FTC.
FIG. 2 is a block diagram showing a configuration example of an embodiment of a disk recording / reproducing apparatus (disk apparatus) to which the present invention is applied.
3 is a block diagram illustrating a detailed configuration example of a data conversion unit in FIG. 2. FIG.
4 is a block diagram illustrating a detailed configuration example of an LTC data processing unit built in a frame metadata processing unit supplied with frame metadata from the data amount detection unit of FIG. 3;
FIG. 5 is a flowchart for describing recording processing by the control unit of FIG. 2;
FIG. 6 is a flowchart illustrating an audio data recording task whose processing is started in step S3 of FIG.
FIG. 7 is a flowchart illustrating an image data recording task whose processing is started in step S4 of FIG.
FIG. 8 is a flowchart illustrating a low resolution data recording task whose processing is started in step S5 of FIG.
FIG. 9 is a flowchart illustrating a frame metadata recording task whose processing is started in step S6 of FIG.
FIG. 10 is a schematic diagram illustrating the data structure of KLV-encoded data.
11 is a flowchart for explaining LTC data generation processing by the control unit in FIG. 4;
12 is a flowchart for explaining LTC data processing by the control unit in FIG. 4;
FIG. 13 is a diagram illustrating a conversion table included in clip metadata.
14 is a schematic diagram showing a configuration example of data recorded on the optical disc in FIG. 2; FIG.
15 is a schematic diagram illustrating an example of the configuration of data recorded on the optical disc in FIG. 2. FIG.
FIG. 16 is a diagram illustrating a configuration example of an imaging record editing system to which the present invention is applied.
17 is a schematic diagram showing a time-series arrangement of clip data recorded by the imaging recording system of FIG.
18 is a flowchart for explaining a reading process by the control unit in FIG. 2;
FIG. 19 is a block diagram illustrating a configuration example of a personal computer to which the present invention is applied.
[Explanation of symbols]
30 disk recording / reproducing device (disk device), 31 optical disk, 32 spindle motor, 33 pickup unit, 34 RF amplifier, 35 servo control unit, 36 signal processing unit, 37 memory controller, 38 memory, 39 data conversion unit, 40 control unit , 41 operation unit, 51 signal input / output device, 61 demultiplexer, 62 data amount detection unit, 63 image signal conversion unit, 64 audio signal conversion unit, 65 low resolution data generation unit, 66 frame metadata processing unit, 67 clip metadata Processing unit, 71 LTC data processing unit, 72 LTC data processing unit, 81 image data conversion unit, 82 audio data conversion unit, 83 low resolution data processing unit, 84 frame metadata processing unit, 85 clip metadata processing unit, 86 multiplexer , 91 LTC data processing unit, 92 LTC data processing unit, 101 control unit, 102 LTC generation unit, 103 initial value setting unit, 104 counter, 105 real-time clock, 110 KLV data, 111 key data, 112 length data, 113 value data , 120 conversion table, 121 LTC, 122 frame number, 123 types, 141 audio annulus data, 142 image annulus data, 143 low-resolution annulus data, 144 frame meta annulus data, 145 clip meta data, 201 central control processing unit

Claims (11)

In a data recording control device that performs control to record image data on a recording medium,
First recording control means for periodically performing recording control and recording the image data on the recording medium for each data amount that is an integral multiple of a recording / reproducing unit;
Recording control is periodically performed, and first position information, which is absolute position information of each frame of the image data, is converted into a first meta data of the image data for each data amount that is an integral multiple of the recording / playback unit. Second recording control means for recording on the recording medium as data;
Performing recording control, associating the first position information with second position information that is relative position information with respect to a first frame of the frame corresponding to the first position information; And third recording control means for recording on the recording medium as second metadata of image data,
The first recording control unit and the second recording control unit alternate the image data and the first metadata for each recording area having a length that is an integral multiple of the recording / reproducing unit of the recording medium. Place and
The third recording control means uses the second metadata corresponding to the first metadata recorded periodically as data having a data amount that is an integral multiple of the recording / reproducing unit. A data recording control apparatus for recording in a predetermined area different from an area where the image data and the first metadata are recorded . The data recording control apparatus according to claim 1, wherein the first position information is a time code indicating an absolute position of the frame using an actual time. The data recording control apparatus according to claim 1, wherein the first position information is a time code indicating an absolute position of the frame using time information with a predetermined time as a reference. The data recording control according to claim 1, wherein the second position information is a time code indicating a relative position of the frame by using a frame number indicating the number of frames from the first frame of the image data. apparatus. The data recording control apparatus according to claim 1, wherein the first metadata is metadata for each frame of the image data. The data recording control apparatus according to claim 1, wherein the second metadata is metadata for each file including the image data. A data recording control method of a data recording control device for controlling image data to be recorded on a recording medium,
A first recording control step of periodically performing recording control, and recording the image data on the recording medium for each data amount that is an integral multiple of a recording / reproducing unit;
Recording control is periodically performed, and the first position information, which is absolute position information of each frame of the image data, is converted into a first meta data of the image data for each data amount that is an integral multiple of the recording / playback unit. A second recording control step for recording data on the recording medium as data;
Performing recording control, associating the first position information with second position information that is relative position information with respect to a first frame of the frame corresponding to the first position information; And a third recording control step for recording on the recording medium as second metadata of image data,
The processing of the first recording control step and the processing of the second recording control step are performed by recording the image data and the first metadata into a recording area having an integral multiple of the recording / reproducing unit of the recording medium. It is done so that it is arranged alternately every time ,
In the processing of the third recording control step, the second metadata corresponding to the first metadata recorded periodically is defined as data having a data amount that is an integral multiple of the recording / reproducing unit. A data recording control method for performing recording in a predetermined area different from an area in which the image data and the first metadata are recorded on a recording medium . A computer-executable program for controlling a data recording control device that performs control for recording image data on a recording medium,
A first recording control step of periodically performing recording control, and recording the image data on the recording medium for each data amount that is an integral multiple of a recording / reproducing unit;
Recording control is periodically performed, and the first position information, which is absolute position information of each frame of the image data, is converted into a first meta data of the image data for each data amount that is an integral multiple of the recording / playback unit. A second recording control step for recording data on the recording medium as data;
Performing recording control, associating the first position information with second position information that is relative position information with respect to a first frame of the frame corresponding to the first position information; And a third recording control step for recording on the recording medium as second metadata of image data,
The processing of the first recording control step and the processing of the second recording control step are performed by recording the image data and the first metadata into a recording area having an integral multiple of the recording / reproducing unit of the recording medium. Let the computer run to alternate each time ,
In the processing of the third recording control step, the second metadata corresponding to the first metadata recorded periodically is defined as data having a data amount that is an integral multiple of the recording / reproducing unit. A program that causes the computer to execute recording in a predetermined area different from an area in which the image data and the first metadata are recorded on a recording medium . In a data reproducing apparatus for reproducing the image data from a recording medium on which the image data is recorded,
Corresponding to the first position information and the first position information corresponding to the first position information, which is absolute position information of each frame of the image data specified by the user, performing read control A table that associates second position information, which is relative position information with respect to the first frame, of the frame to be recorded, the image data of the recording medium, and the first position information including the first position information. As data having a data amount that is an integral multiple of the recording / reproduction unit in a predetermined area different from the area where one metadata is alternately arranged for each recording area having a length that is an integral multiple of the recording / reproduction unit of the recording medium First read control means for reading from the recorded second metadata of the image data;
Calculating means for calculating the second position information corresponding to the first position information designated by a user using the table read by the first reading means;
And second reading control means for performing reading control and starting reading of the image data from a frame of the image data corresponding to the second position information calculated by the calculating means. Data playback device. A data reproduction method of a data reproduction apparatus for reproducing the image data from a recording medium on which image data is recorded,
Corresponding to the first position information and the first position information corresponding to the first position information, which is absolute position information of each frame of the image data specified by the user, performing read control A table that associates second position information, which is relative position information with respect to the first frame, of the frame to be recorded, the image data of the recording medium, and the first position information including the first position information. Data having a data amount that is an integral multiple of the recording / reproduction unit in a predetermined area different from areas where one metadata is alternately arranged for each recording area having a length that is an integral multiple of the recording / reproduction unit of the recording medium A first read control step of reading from the recorded second metadata of the image data;
A calculation step of calculating the second position information corresponding to the first position information designated by a user using the table read by the processing of the first reading step;
A second read control step of performing read control and starting reading of the image data from the frame of the image data corresponding to the second position information calculated by the processing of the calculation step. Data reproduction method. A computer-executable program for controlling a data reproducing apparatus for reproducing the image data from a recording medium on which image data is recorded,
Corresponding to the first position information and the first position information corresponding to the first position information, which is absolute position information of each frame of the image data specified by the user, performing read control A table that associates second position information, which is relative position information with respect to the first frame, of the frame to be recorded, the image data of the recording medium, and the first position information including the first position information. Data having a data amount that is an integral multiple of the recording / reproduction unit in a predetermined area different from areas where one metadata is alternately arranged for each recording area having a length that is an integral multiple of the recording / reproduction unit of the recording medium A first read control step of reading from the recorded second metadata of the image data;
A calculation step of calculating the second position information corresponding to the first position information designated by a user using the table read by the processing of the first reading step;
Performing read control and causing the computer to execute a second read control step of starting reading of the image data from the frame of the image data corresponding to the second position information calculated by the processing of the calculation step A program characterized by that.

Images