JP4255796B2 - DATA RECORDING DEVICE, DATA RECORDING METHOD, DATA RECORDING PROGRAM, AND RECORDING MEDIUM CONTAINING THE PROGRAM - Google Patents

Description

  In the present invention, time series data such as video data and audio data, and post-record data corresponding to the time series data and currently blank for recording later are used as a set of continuous data. The present invention relates to a data recording apparatus, a data recording method, a data recording program, and a recording medium on which the program is recorded, for continuously recording data on a randomly accessible recording medium.

  Data recording apparatuses for recording / reproducing AV (Audio Visual) contents such as video, audio, music, etc., on disk recording media such as optical disks and magnetic disks, and semiconductor recording media have become widespread. In recording these AV contents, a technique has been devised that realizes an after-recording (hereinafter abbreviated as “after-recording”) function in the same manner as a tape medium.

  The post-recording function is a function for adding data to be reproduced in synchronization with video data and audio data that have already been recorded. Examples of such data include sound data such as music and narration, graphic data such as still images to be displayed superimposed on video data, and text data such as subtitles.

  A method for realizing an after-recording function using a disk recording medium will be described with reference to FIG. FIG. 20 shows a plurality of files created when AV content is recorded, and physical recording positions at which data in these files are recorded on a recording medium. As shown in the figure, when AV content is recorded, an AV stream data file 2031, an after-recording file 2032, and an additional data file 2033 are created.

  The AV stream data file 2031 includes a plurality of AV stream data that are video and audio data. The after-recording file 2032 includes a plurality of after-recording data corresponding to each AV stream data. Since the after-recording data is data to be recorded later as described above, when recording the AV content on the recording medium, only the recording areas 2000 to 2003 for recording the after-recording data are secured. The recording areas 2000 to 2003 are called post recording unit areas (hereinafter referred to as “PRU areas”).

  The additional data file 2033 includes a plurality of management information data added to reproduce each AV stream data at an appropriate timing. The management information data includes a time address conversion table necessary for reproducing AV stream data.

  As shown in the figure, when recording AV stream data and securing a PRU area on a recording medium, one AV stream data recording area and a PRU area corresponding to the AV stream data are set as one set. Data is recorded and areas are secured so that they are physically continuously arranged, and each of the above sets 2010 to 2013 is sequentially executed. After the AV stream data is recorded, the post-record data corresponding to each AV stream data is recorded in the corresponding PRU area, thereby completing the AV content.

  In this way, by continuously arranging the AV stream data and the after-record data corresponding to the AV stream data on the recording medium, the corresponding after-record data is reproduced with a delay when the AV stream data is reproduced. Can be prevented.

  When recording is performed in units of the sets 2010 to 2013, the management information data corresponding to each set is continuously arranged and recorded in the AV stream data of each set. Thereby, when reproducing AV stream data, various information necessary for reproduction can be read continuously.

Further, in Patent Document 1 below, a management information file 730 including all management information data is recorded in another recording area 1620. As a result, management information data can be re-created from the management information file 730 even if each management information data recorded continuously arranged in the AV stream data cannot be read due to damage of the recording medium or the like.
JP 2002-197839 A (published July 12, 2002)

  As described above, in the conventional case, after recording a certain set, the management information data corresponding to the set is recorded in the continuous recording area, and then the next set is recorded. In other words, the management information data is recorded during the recording of each set. For this reason, a recording buffer capable of temporarily storing AV stream data input while recording management information data is required. Further, in order to record the AV stream data accumulated in the recording buffer in the next set, it is necessary to increase the length of the AV stream data to be recorded.

  The same can be said for data reproduction. That is, the management information data is reproduced during the reproduction of each set. For this reason, a reproduction buffer capable of temporarily storing AV stream data to be output during reproduction of management information data is necessary, and the AV stream data to be accumulated in the reproduction buffer is reproduced from the recording medium. It is necessary to increase the length of the AV stream data to be processed.

  Increasing the capacity of the recording buffer or the reproducing buffer increases the circuit scale of these buffers. Further, when the length of the AV stream data is increased, the unit specified when editing (destructive editing) accompanied by movement or deletion of the AV stream data becomes coarse.

  Further, when the management information data is not continuously arranged in each set of AV stream data, a seek operation is required, so that recording and reproduction of AV stream data is further delayed. For this reason, it is necessary to further increase the capacity of the recording buffer or the reproduction buffer and further increase the length of the AV stream data. In addition, the occurrence of a seek operation increases operation noise and vibration, and increases power consumption.

  Also, since the recording area of management information data is narrower than the recording area of AV stream data, it is difficult to reuse it as a recording area of AV stream data. For this reason, the utilization efficiency of a recording medium will fall.

  In order to solve the above-mentioned problem, it is possible to record a management information file including all management information data after recording all sets, without continuously arranging management information data in each set of AV stream data. Conceivable. In this case, since management information data is not recorded between sets of recording, the capacity of the recording buffer can be minimized, and the data length of AV stream data can be minimized.

  However, since it is necessary to store all the management information data, the storage area of the storage device is compressed with the management information data. In some cases, during the recording of the AV stream data, the amount of management information data of the AV stream data recorded so far exceeds the storage capacity of the storage device, and it is impossible to record the AV stream data any more. It may be possible.

  Further, when recording the after-recording data together with the AV stream data, it is necessary to record the after-recording data corresponding to the AV stream data of each set in the PRU area of each set. Until this is done, it is necessary to wait for the recording of post-recording data, resulting in a recording delay. Furthermore, as shown in FIG. 20, when the PRU area is provided upstream of the recording area of the AV stream data, a seek operation is performed after the recording of the AV stream data to record the post-recording data in the PRU area. This will cause additional recording delays.

  The present invention has been made in view of the above problems, and its object is to reduce the capacity of the recording buffer or the reproduction buffer and to reduce the size of the AV stream data, thereby improving the efficiency of use of the recording medium. An object is to provide an improved data recording apparatus, data recording method, data recording program, and recording medium on which the program is recorded.

  In order to solve the above problems, a data recording apparatus according to the present invention records stream data, which is data to be continuously recorded and / or reproduced, and is reproduced in synchronization with the stream data and recorded later. In a data recording apparatus comprising recording control means for continuously securing a recording area of post-record data, which is data to be recorded, to a recording medium as one set, and controlling the recording medium to be performed for a plurality of sets, the recording control means Is characterized in that, in a certain set, the stream data is recorded, and control is performed so that specific data that is different from the stream data is recorded in a recording area of the after-recording data.

  Furthermore, in the data recording apparatus according to the present invention, in the above configuration, the recording control unit performs a plurality of sets of recording, and then specifies the specific data recorded in the recording area of the after-recording data as the stream data and the after-recording. A specific data movement control means for controlling to move to a recording area different from the data recording area is provided.

  Furthermore, the data recording apparatus according to the present invention is characterized in that, in the above configuration, the recording control means controls to record the specific data in each set.

  Furthermore, the data recording apparatus according to the present invention is characterized in that, in the above configuration, the recording control means controls to record a plurality of the specific data in a certain set.

  Furthermore, the data recording apparatus according to the present invention is configured such that, in the above configuration, the recording control means controls to record the specific data in a set in which the specific data is recorded after a lapse of a predetermined period from the previous recording. It is characterized by doing.

  Furthermore, the data recording apparatus according to the present invention further includes a storage unit that accumulates specific data in the above configuration, and the recording control unit detects the decrease in the remaining amount of the storage unit when Control is performed so as to record specific data stored in the storage means.

  Further, the data recording apparatus according to the present invention further includes an input means for the user to input information in the above configuration, and the recording control means is configured to perform the above operation based on the information of the write instruction from the input means. It is characterized by controlling to record specific data.

  Further, the data recording apparatus according to the present invention further includes a situation detecting unit for detecting the situation of the apparatus in the above configuration, and the recording control unit is configured to detect the specific data based on the detection by the situation detecting unit. It is characterized by controlling to record.

  Furthermore, the data recording apparatus according to the present invention is characterized in that, in the above-mentioned configuration, the recording control means controls to record one management file for managing the plurality of sets of specific data.

  Further, the data recording apparatus according to the present invention is characterized in that, in the above configuration, the recording control means controls to record a plurality of management files for managing the plurality of sets of specific data.

  Further, the data recording apparatus according to the present invention is characterized in that, in the above-described configuration, the data recording apparatus further includes an input means for a user to input information, and the specific data is input data from the input means.

  Furthermore, the data recording apparatus according to the present invention is characterized in that, in the above configuration, the specific data is related data related to the stream data.

  Furthermore, the data recording apparatus according to the present invention is characterized in that, in the above configuration, the related data is management information necessary for reproducing the stream data.

  Furthermore, the data recording apparatus according to the present invention is characterized in that, in the above configuration, the related data is data reproduced in synchronization with the stream data.

  Further, in the data recording apparatus according to the present invention, in the above configuration, the recording control means records a certain set of related data in a recording area of post-record data secured in a set after the set. It is characterized by controlling to.

  Furthermore, the data recording apparatus according to the present invention is characterized in that, in the above configuration, the data recording apparatus further includes related data acquisition means for acquiring the related data from the contents of the stream data.

  Furthermore, the data recording apparatus according to the present invention is characterized in that, in the above configuration, the specific data is data not related to the stream data.

  Further, in order to solve the above problems, the data recording method according to the present invention records stream data that is data to be continuously recorded and / or reproduced, and corresponds to the stream data and is recorded later. In a data recording method in which the recording area of the after-recording data, which is data to be recorded, is continuously recorded on a recording medium as one set, and this is performed for a plurality of sets, the stream data is recorded in a certain set, and Specific data that is different from the stream data is recorded in a recording area of the after-recording data.

  A data recording program according to the present invention is a data recording program for operating the data recording apparatus to solve the above-described problem, and is a data recording program for causing a computer to function as the recording control means. It is characterized by being.

  In addition, a computer-readable recording medium according to the present invention is characterized in that the data recording program is recorded in order to solve the above problems.

  As described above, in the data recording apparatus according to the present invention, the recording control unit records the stream data in a certain set and records specific data that is different from the stream data in the recording of the post-recording data. It is the structure which controls to record to an area | region. Here, the specific data includes related data related to the stream data and data not related to the stream data such as data from the broadcast, the network, and the external device.

  According to the above configuration, the specific data is recorded in the recording area reserved for the after-recording data, so that it is not necessary to secure another recording area for recording the specific data. Further, since the specific data is recorded in the recording area in the set, it is not necessary to perform a seek operation in order to record the specific data in the recording area outside the set. Therefore, the delay caused by the recording of the specific data can be suppressed, so that the stream data size can be reduced and the disk utilization efficiency can be improved.

  The recording control means moves the specific data recorded in the recording area of the after-recording data to a recording area different from the recording area of the stream data and the after-recording data after performing a plurality of sets of recording. It is desirable to provide specific data movement control means for controlling the data.

  In this case, since the specific data is moved to another recording area after a plurality of sets of recording is completed, there is an effect that the entire recording area of the after-recording data can be used when the after-recording data is recorded later. If the other recording area is an area where the specific data is to be originally recorded, the stream data and the specific data can be reproduced by the same data reproduction process as before, and no special data reproduction process is required. There is an effect. Further, if the specific data is dummy data which is meaningless as post-record data, it is not necessary to delete the specific data in order to record the post-record data, and the recording process of the post-record data is performed because the specific data is recorded. There is an effect of preventing the delay.

  Further, the recording control means may control to record the specific data in each set. In this case, since specific data is recorded in each set, it is possible to perform editing operations such as data copying, moving, and insertion processing in units of sets. Further, when the specific data is management information necessary for reproducing the stream data, the management information that is managed collectively from the start to the end of the recording of the stream data is interpreted, and the data in the set can be obtained without operating the data. This is particularly effective because it can be edited simply by manipulating the data.

  On the other hand, the recording control means may perform control so as to record a plurality of the specific data together in a certain set. In this case, since the number of times of writing the specific data is reduced, there is an effect that the data recording process becomes quick. There are various timings for writing as follows.

  For example, the recording control means may control to record the specific data in a set in which the specific data is recorded last time and recorded after a predetermined period. In this case, since the stream data up to the point where the specific data is recorded in the recording area of the after-recording data and the specific data are recorded on the recording medium, the recording can be performed even when the power supply of the data recording apparatus is suddenly stopped. The contents are retained, and the effect of taking measures against power interruption occurs.

  As another example, a storage means for storing specific data is further provided, and the recording control means records the specific data stored in the storage means when detecting a decrease in the remaining amount of the storage means. It is possible to control so as to. In this case, there is an effect that the attempt to store the specific data exceeding the storage capacity of the storage means fails, the specific data is lost, and the storage capacity of the storage means is prevented from increasing. As a result, even if the storage capacity of the storage means is small, it is possible to record long-time stream data. Note that all of the specific data stored in the storage means may be written, or a part thereof may be written.

  As yet another example, the apparatus further includes input means for inputting information by the user, and the recording control means performs control so as to record the specific data based on information of a write instruction from the input means. Can be mentioned. In this case, the specific data can be backed up from the memory to the recording medium according to the user's judgment. In addition, there is an effect that the backup timing can be freely set according to the importance of the content of the specific data.

  As another example, it is further provided with a status detection unit that detects the status of the apparatus, and the recording control unit controls to record the specific data based on the detection of the status detection unit. It is done. Here, examples of the state detection means include an acceleration sensor that detects an impact of the apparatus and a battery capacity detection sensor that detects a remaining capacity of a battery that is a power source of the apparatus. In this case, during the recording of the stream data, there is an effect of preventing a recording process failure due to an impact applied to the apparatus and a loss of specific data on the memory due to a power failure.

  Further, the recording control means may control to record one management file for managing the plurality of sets of specific data. In this case, since a plurality of specific data is managed by one management file, there is an effect that the recording area of the after-recording data in which the specific data is recorded can be immediately grasped. In addition, since the recording area can be managed by a simple method, the recording area can be easily managed.

  On the other hand, the recording control unit may control to record a plurality of management files for managing the plurality of sets of specific data. In this case, each management file can be recorded by the timing at which the specific data is recorded, by the type of the specific data, and the like, and there is an effect that it becomes easy to organize and classify for each content of the specific data.

  Further, an input means for a user to input information may be further provided, and input data from the input means may be the specific data. In this case, there is an effect that it is possible to provide the function of recording the input data input by the user at a timing that is conceived during the recording of the stream data and taking a memo during the recording.

  Note that the input data is preferably information related to reproduction or content of the recorded stream data. In this case, when the final division operation of the stream data is performed after the recording of the stream data, there is an effect that it can be performed smoothly by referring to the memo added during the recording.

  The specific data is preferably related data related to the stream data. Here, as the related data related to the stream data, there are management information such as a time address conversion table necessary for reproducing the stream data, and data reproduced in synchronization with the stream data such as the after-recording data.

  If the related data is data that is reproduced in synchronization with the stream data, the related data and the stream data can be continuously reproduced when the stream data is reproduced. Therefore, since the seek of the reproducing head does not occur, the power consumption is reduced and the operation sound of the data reproducing apparatus is reduced.

  Further, the recording control means may control to record a certain set of related data in a recording area of post-recording data secured in a set after the set. In this case, since the related data is recorded in a set after the corresponding set, there is an effect that it is possible to suppress a recording delay that occurs until the related data is created and recorded after the stream data to be recorded is determined.

  Moreover, you may further provide the related data acquisition means which acquires the said related data from the content of the said stream data. Here, the contents of the stream data include scene information and chapter information. In this case, when the recorded stream data is played back, it becomes easier to grasp what kind of content or configuration the entire stream data has, and any part of the stream data to be played back is immediately searched. Has a useful effect.

  The specific data may be data not related to the stream data. In this case, there is an effect that data for a different purpose from the stream data can be recorded simultaneously with the stream data.

  Further, as described above, the data recording method according to the present invention is a method for recording the stream data in a certain set and recording the specific data in a recording area of the after-recording data.

  According to the above method, the specific data is recorded in the recording area reserved for the after-recording data, so that it is not necessary to secure another recording area for recording the specific data. Further, since the specific data is recorded in the recording area in the set, it is not necessary to perform a seek operation in order to record the specific data in the recording area outside the set. Therefore, the delay caused by the recording of the specific data can be suppressed, so that the stream data size can be reduced and the disk utilization efficiency can be improved.

  The recording control means in the data recording apparatus can be executed on a computer by a recording control program. Furthermore, the recording control program can be executed on an arbitrary computer by storing the recording control program in a computer-readable recording medium.

[Embodiment 1]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows a schematic configuration of a video disc recorder capable of post-recording in the present embodiment.

  As shown in FIG. 2, the video disk recorder 10 includes a bus 100, a host CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102, a ROM (Read Only Memory) 103, a user interface 104, and a system clock generator. 105, optical disk (recording medium) 106, pickup 107, ECC (Error Correcting Coding) decoder 108, ECC encoder 109, reproduction buffer 110, recording / post-recording buffer 111, demultiplexer 112, multiplexer 113, multiplexing buffer 114 , An audio decoder 115, a video decoder 116, an audio encoder 117, a video encoder 118, and a camera, a microphone, a speaker, a display, etc. (not shown).

  The host CPU 101 controls the pickup 107, the demultiplexer 112, the multiplexer 113, the audio decoder 115, the video decoder 116, the audio encoder 117, the video encoder 118, and the like through the bus 100 by executing the program. The demultiplexer 112, the multiplexer 113, the pickup 107, the audio decoder 115, the video decoder 116, the audio encoder 117, and the video encoder 118 may implement each function by hardware, or by executing software by the CPU. Each function may be realized.

  The RAM 102 loads a program such as a control program executed by the host CPU 101 in order to control the operation of the video disk recorder, data necessary for executing the program, and provides a work area for executing the program. Yes.

  The ROM 103 stores the above programs and data. The control program includes a data recording program for realizing processing at the time of recording described later. This data recording program is recorded not only in the ROM 103 but also in a recording medium such as an optical disk, a magneto-optical disk, a magnetic disk, a magnetic tape, and a semiconductor memory that can be read by a computer, and is read by a drive device (not shown) and stored in the RAM 102. It may be stored.

  The user interface 104 is for displaying operation guidance on a display screen or accepting operation input by the user so that the user can perform various operations of the video disc recorder 10 using the remote controller. . The user interface 104 can be realized by executing software on the CPU. The system clock generator 105 is a circuit that generates a system clock to be supplied to the CPU 101, the RAM 102, the ROM 103, and the like.

  During reproduction, data read from the optical disk 106 through the pickup 107 is error-corrected by the ECC decoder 108 and temporarily stored in the reproduction buffer 110. In accordance with the data transmission request from the audio decoder 115 and the video decoder 116, the demultiplexer 112 distributes the data in the reproduction buffer 110 to the appropriate decoders 115 and 116 depending on the type. The audio decoder 115 and the video decoder 116 decode the data sent from the demultiplexer 112.

  On the other hand, at the time of recording, audio data and video data are compression encoded by the audio encoder 117 and the video encoder 118, respectively. The compression-coded audio data and video data are sent to the multiplexing buffer 114 via the multiplexer 113 and temporarily stored there. Further, the multiplexer 113 reads the data from the multiplexing buffer 114 and AV-multiplexes it, and sends the AV multiplexed data to the recording / post-recording buffer 111. The ECC encoder 109 adds an error correction code to the AV multiplexed data sent from the recording / after-recording buffer 111 and records it on the optical disc 106 through the pickup 107.

  As an encoding method of audio data by the ECC encoder 109, for example, MPEG1 Layer-II defined by ISO / IEC 11172-3 can be used. On the other hand, for example, MPEG2 defined by ISO / IEC 13818-2 can be used as a video data encoding method by the ECC encoder 109.

  The optical disk 106 is a recording medium that is recorded and reproduced spirally from the outer periphery to the inner periphery, such as a DVD-RAM, and is a recording medium that can be attached to and detached from the video disk recorder 10. The optical disk 106 has 2048 bytes as one sector, and an ECC block is composed of 16 sectors for error correction. When the data in the ECC block is rewritten, the entire ECC block including the data is read, error correction is performed, the target data is rewritten, an error correction code is added again, and the ECC block is configured on the optical disk 106. Recording is done.

  Further, as a rotation control method at the time of recording on the optical disc 106, ZCAV (constant zone angular velocity) is adopted in order to increase recording efficiency. For this reason, the recording area is composed of a plurality of zones having different rotational speeds.

  In the video disc recorder 10 according to the present embodiment, a file system is used to manage various information on the optical disc 106, and data (after-recording data, audio data, video data) is recorded on the optical disc 106 in accordance with this file system. Is done. For the file system, UDF (Universal Disk Format) can be used in consideration of interoperability with a personal computer (hereinafter abbreviated as PC). On the file system, various management information (related data) and AV streams are handled as files.

  The file system manages the user area with 2048-byte logical blocks. This logical block has a one-to-one correspondence with the sector. Each file on the user area is composed of an integer number of extents (consecutive logical blocks), and may be recorded in a distributed manner in units of extents. Free areas in the user area are managed in units of logical blocks using Space Bitmap.

  In this embodiment, the QuickTime file format is used as a format for AV stream management. The QuickTime file format is a multimedia data management format developed by Apple and widely used in the PC world.

  The QuickTime file format is composed of video data, audio data, etc. (these may be collectively referred to as media data) and management information. The media data and the management information are collectively referred to herein as a QuickTime movie (abbreviated as a movie). The media data and the management information may exist in the same file or may exist in different files.

  FIG. 4A shows a configuration that is used when both exist in the same file 201. Various types of information are stored in a common structure called “atom”. More specifically, the first management information is stored in a structure called Movie atom 211, and the media data is stored in a structure called Movie data atom 212.

  The management information in Movie atom 211 includes a table for deriving a relative position in the media data file corresponding to an arbitrary time in the media data, media data attribute information, external reference information described later, and the like. ing. On the other hand, AH (Atom Header) is added to the media data in the Movie data atom 212, that is, the AV stream (AV stream) 213. In such a configuration, the Movie atom refers to the media data in the atom.

  FIG. 4B shows a configuration when management information and media data are stored in separate files 202 and 203, respectively. Management information is stored in a structure called Movie atom 211, but media data need not be stored in atom. At this time, it is said that the Movie atom 211 “externally references” the file 203 storing the media data.

  As shown in FIG. 4C, external reference is performed, for example, from the Movie atom 211 in the file 204 to the AV streams 213 (AV stream # 1, # 2) stored in a plurality of files 205 and 206, respectively. It is possible.

  By such a mechanism, so-called “non-linear editing” and “non-destructive editing” that make it appear as if editing has been performed without physically moving the AV stream 213 itself become possible. In addition, it is possible to create a plurality of user programs using the same scene of the AV stream recorded on the optical disc 106, and it is also possible to refer to the same post-record data using a plurality of user programs. .

  FIG. 5 shows the form of an AV stream. The AV stream 401 is composed of one or more CUs (Continuous Units) 402. The CU 402 is a unit that is continuously recorded on the disc. The stream is configured so that the boundary of the CU 402 matches the ECC block boundary.

  The length of the CU 402 is such that the CU 402 constituting the AV stream 401 can be seamlessly reproduced (images and sounds can be reproduced without interruption during reproduction) or real-time after recording (video to be dubbed) regardless of how the CU 402 constituting the AV stream 401 is arranged. Recording the audio while seamlessly playing the video).

  Further, the CU 402 is assigned consecutive numbers from the beginning such as # 1, # 2,..., #L, and each CU 402 is composed of one PRU 403 and one or more VUs (Video Units) 404. Is done. The PRU 403 corresponds to the aforementioned post-record data block. The area size of the PRU 403 is obtained by multiplying the playback time of the CU 402 by the maximum audio bit rate. On the other hand, the VU 404 is a unit that can be reproduced independently, and a set of the VU 404 corresponds to the original block described above. Similarly to the CU 402, the VU 404 is assigned numbers such as # 1, # 2,.

  The configuration of QuickTime management information will be described later.

  A UDF (Universal Disk Format) which is a file system format used in this embodiment will be described with reference to FIG. FIG. 4A shows an example of the configuration of directories and files, and FIG. 4B shows an example of recording the configuration example in UDF.

  An AVDP (Anchor Volume Descriptor Pointer) 602 in FIG. 6B corresponds to an entry point for searching for UDF management information, and is usually the 256th sector, the Nth sector, or the (N-256) th sector (N is (Maximum logical sector number). A VDS (Volume Descriptor Sequence) 601 records management information related to a volume that is an area managed by the UDF. One volume generally exists on one disk, and generally contains one partition.

  One FSD (File Set Descriptor) 603 exists in the partition. The position information in the partition is indicated by a logical block number corresponding to the sector number from the head of the partition. One logical block corresponds to one sector. Each partition has a table (not shown) indicating whether each logical block called Space Bitmap has already been assigned to the file.

  The FSD 603 includes position information of an FE (File Entry) 604 of the root directory (consisting of a logical block number and a logical block number and called “extent”). The FE manages a set of extents, and it is possible to change the order of actual data constituting a file and insert or delete data by rewriting extents or adding or deleting extents.

  The FE 604 manages an area 605 that stores a set of FIDs (File Identifier Descriptors) 611, 612,... That store files directly under the root directory, directory names, and the like. The FIDs 611 and 612 in the area 605 include file names of the files 621 and 622 and position information of the FEs 606 and 608 that manage a set of extents, respectively.

  The FE 606 manages the areas 607 and 610 that are areas constituting the actual data of the file 621 as extents. The FE 608 manages an area 609 that is an area constituting the actual data of the file 622 as an extent. At this time, in order to access the actual data of the file 621, the links may be followed in the order of AVDP 602, VDS 601, FSD 603, FE 604, FID 611, FE 606, area 607, and area 610.

  In the data recording area of the optical disc 106, an AV stream is recorded with the configuration of FIG. The above-mentioned movie file, that is, the AV stream and management information are recorded as actual data constituting the file represented by the areas 607 and 610 in FIG. For example, the Movie atom 211 of the movie file 201 in FIG. 4A is recorded in the first half of the area 610, and the Movie data atom 212 including the AV stream is recorded in the second half of the area 610 and the entire area 607. Can be considered.

  In this case, the position information is stored in the FE 606 in the order of the extent of the area 610 and the extent of the area 607 so that the movie file 201 is read through the file system in the order shown in FIG. In other words, as shown in this example, the actual data constituting the file is not actually guaranteed to be continuously recorded on the optical disk 106, and is not guaranteed to be recorded on the optical disk 106 in the order in the file. .

  There are some exceptions: With respect to a disk recording medium, access to data at a physically distant place on the disk accompanies the movement of the pickup, during which data reading and recording stops. Therefore, it is possible to record video data and audio data by recording management information physically continuously, thereby speeding up the reading of management information, or recording AV streams continuously with a predetermined length or more. It is a well-known technique to ensure playback without interruption.

  FIG. 3 shows functional blocks related to data recording control on the optical disc 106 in the video disc recorder 10. The continuous recording control unit 120, the management information file creation unit 121, and the partial management information creation unit 122 shown in the figure can implement their functions by executing programs on the host CPU 101. The RAM 102 also includes a management information storage unit 123 that stores the management information described above.

  The continuous recording control unit 120 controls the recording / after-recording buffer 111 so that the AV streams 213 and 401 are continuously recorded on the optical disk 106 in units of the CU 402 described above. In addition, the continuous recording control unit 120 creates management information related to the recorded AV stream and stores it in the management information storage unit 123 of the RAM 102. The continuous recording control unit 120 also receives the partial management information from the partial management information creating unit 122 and sends the received partial management information to the recording / after-recording buffer 111 so as to be stored in the PRU 403.

  When the amount of management information stored in the management information storage unit 123 reaches the capacity, the partial management information creation unit 122 reads a part of the management information from the management information storage unit 123 and continuously records it as partial management information. Send to control unit 120. In addition, the partial management information creation unit 122 deletes a part of the read management information from the management information storage unit 123. Thereby, it is possible to prevent the amount of management information from exceeding the capacity of the management information storage unit 123, and it is possible to prevent a part of the management information from being lost.

  After recording the AV stream, the management information file creation unit 121 creates a management information file including management information, and sends the created management information file to the recording / after-recording buffer 111 so as to be recorded on the optical disc 106. The management information file creation process in the management information creation unit 122 differs depending on whether or not the partial management information has been created.

  When the partial management information is not created, all the management information is stored in the management information storage unit 123. Therefore, the management information may be read from the management information storage unit 123 and recorded on the optical disc 106 as a management information file.

  On the other hand, when the partial management information is created, a part of the management information is recorded in the PRU area on the optical disc 106 as the partial management information. Therefore, the management information file creation unit 121 reproduces the partial management information from the PRU area, temporarily stores it in the management information storage unit 123 via the demultiplexer 112, reads it from the management information storage unit 123, and records the management information. Is recorded in another recording area, and this is repeated for all pieces of partial management information.

  Note that after the recording of the AV stream is completed, the remaining portion of the management information is stored in the management information storage unit 123. For this reason, when the partial management information is reproduced from the optical disk 106 and stored in the management information storage unit 123, the capacity of the management information storage unit 123 may be insufficient.

  Therefore, in the present embodiment, after the recording of the AV stream ends, the management information file creation unit 121 first performs a desired recording on the optical disc 106 using the remaining portion of the management information stored in the management information storage unit 123 as a temporary data file. Record in the area. In this case, the management information file creation unit 121 reproduces all the partial management information from the PRU area and records it in the management information recording area as described above, and then reproduces the temporary data file from the optical disk 106 and demultiplexer 112. Are temporarily stored in the management information storage unit 123, read out from the management information storage unit 123, and recorded in another recording area for recording the management information. As a result, all management information is recorded in the management information recording area.

  Next, a method for recording data different from the AV stream data (hereinafter referred to as additional data) while recording the AV stream data will be described with reference to FIGS. In the present embodiment, a method for recording management information that is attribute information such as a time address conversion table necessary for reproducing AV stream data as additional data, recording date and time, and recording location will be described.

  FIG. 1 shows a case in which AV content is recorded on the optical disk 106 in units of the above-mentioned CU composed of AV stream data and PRU, and management information such as a time address conversion table necessary for reproducing the AV stream data is recorded. Is shown. With respect to PRU, after recording AV stream data, only a recording area is secured in advance in order to record post-record data. Further, at the time of initial recording of AV stream data, one after-recording file 732 is created that manages all physical PRU areas recorded by interleaving with AV stream data as logically continuous areas via the file system. . Data in this area is recorded as dummy data.

  The size of one CU is buffered so that recording does not fail in consideration of the time required to secure the PRU area and recording AV stream data and the time to seek from the recorded CU to the beginning of the next CU. Size. Furthermore, the size of one CU is buffered so that playback does not fail in consideration of the time required for playback of post-recording data and AV stream data and the time required to seek from the reproduced CU to the beginning of the next CU. Size. That is, it is necessary to continuously ensure on the recording medium at least a minimum size that enables seamless recording or reproduction of AV stream data and post-recording data.

  In the present embodiment, as shown in FIG. 1, when AV stream data is recorded on the optical disc 106, all management information is recorded in one management information file 730. Each piece of management information is created each time AV stream data corresponding to one CU is recorded on a recording medium, and is accumulated in a memory (management information storage unit 123 of the RAM 102). Therefore, when the memory has a storage capacity capable of holding all management information, all management information collectively held on the memory after the recording of the AV stream data is completed as one management information file 730. What is necessary is just to record on the optical disk 106.

  On the other hand, if the memory does not have a storage capacity capable of holding all management information, it is necessary to save to the optical disk 106 or a different memory when the memory that can be held is full. In the present embodiment, the data on the memory that has been held until the memory is full is recorded as additional data in the PRU area of the CU. The data recording processing method of this embodiment will be described below with reference to the drawings.

  FIG. 1 shows a state where CU and management information are physically recorded on the optical disc 106 and a state where it is logically recorded via a file system. Data recorded on the optical disc 106 via the file system is managed as logical continuous data by an AV stream data file 731, an after-recording file 732, and a management information file 730, respectively. The management information file 730 manages content data in a format in which the AV stream data file 731 and the after-recording file 732 are externally referenced using the QuickTime file format as a file format for managing AV stream data.

  Next, a new recording process of AV stream data will be described with reference to FIGS. 1 and 7. First, as a file to be recorded on the optical disc 106, an AV stream data file 731, an after-recording file 732, and a management information file 730 are opened as newly created files (step S101; hereinafter may be abbreviated as “S101”). The same applies to the steps in step 1).

  At this time, a video track (Audio Track) for managing AV stream data in the QuickTime file format and an audio track (Audio Track) for managing AV stream data and a PRU management track for managing an area where no post-record data is recorded in the PRU area are stored in the memory. create. In the PRU management track, the PRU area in the CU unit is set as one sample, and the position, size, and time information in the file are registered in the sample table for all the PRU areas. Since the PRU management track is a track that is not played back, the Track Enabled flag of the Track Header atom is set to 0 to indicate that it is not a playback target.

  Next, the PRU area 700 corresponding to the first CU 710 is sought, and seek is performed to the head of the AV stream data recording area 705. Then, the sample table corresponding to the PRU area 700 is registered in the PRU management track (S102).

  Next, the AV stream data is recorded in the AV stream data area 705 (S103). A sample table of recorded AV stream data is registered in a video track and an audio track for each video data and audio data.

  Next, it is determined whether or not the recording of the AV stream data is completed (S104). When recording of the AV stream data is finished, the process proceeds to step S109. Here, in order to continue recording AV stream data, the process proceeds to step S105.

  In step S105, in order to record the next AV stream data, a search is made for a continuous free area of a CU size or more necessary for compensating seamless recording / reproduction from the optical disk 106, and seek to the head of the found continuous free area 711 is performed. To do.

  Next, by checking whether management information such as a video track, an audio track, and a PRU management track corresponding to the recorded AV stream data exceeds the memory size, the management information on the memory is added as PRU as additional data. It is determined whether or not to record in the area (S106). If additional data is to be recorded, the process proceeds to step S107. If not, the process proceeds to step S108.

  Here, since the management information data on the memory is not full, the process proceeds to step S108. That is, the PRU area 701 is skipped from the current recording position, and seek is performed to the head of the AV stream data recording area 706. Then, similarly to S102, the sample table corresponding to the PRU area 701 is registered in the PRU management track (S108). Steps S103 to S108 are repeated until the management information on the memory is full.

  If it is detected in step S106 that the data on the memory is full, the management information registered on the memory so far is recorded as additional data in the PRU area, and the position of the additional data recorded in the PRU area is recorded. In order to store, the offset value and size in the after-recording file where the additional data exists, or the sample number and size in the PRU management track are separately stored in the memory (hereinafter, the data stored in the memory is stored as additional data). (S107). As a result, as shown in FIG. 1, the PRU area 702 in the CU area 712 becomes an area 715 where additional data is recorded and a remaining area 725.

  Next, the remaining area 725 is skipped from the current recording position, and seek is performed to the head of the AV stream data recording area 707. Then, similarly to S102, a sample table corresponding to the PRU area 702 is registered in the PRU management track (S108). Here, registering all the PRU areas 702 in the PRU management track indicates that the additional data 717 recorded in the PRU area is managed as one of dummy data when viewed from the post-recording file. The area 702 manages that no meaningful data is recorded. Therefore, it is necessary to manage the position of the additional data recorded in the PRU area 702 as a storage location data table for the additional data separately from the PRU management track.

  The above steps S103 to S108 are repeated until the recording of the AV stream data is completed. When recording of the AV stream data is to end, the process proceeds to step S109 in the recording process end determination process (S104).

  If additional data has not been recorded on the optical disc 106 even once AV stream data is recorded in step S109, that is, if all AV stream data management information is stored in the memory, the process proceeds to step S116. The management information on the memory is recorded in the management information file 730 (S116). Then, the AV stream data file 731, the management information file 730, and the after-recording file 732 are closed, and the AV stream data recording process is terminated (S 117).

  On the other hand, if additional data is recorded on the optical disc 106 even once from the start of recording of AV stream data in step S109, the following processing is performed. That is, the partial management information of the AV stream data, which is the additional data recorded so far, is read from the optical disc 106 and combined as one piece of management information and recorded in the management information file 730.

  However, the management information from the last recording of the additional data in the PRU area 703 to the end of recording of the AV stream data, that is, the AV stream data recorded from the beginning 742 of the recording area 708 to the end 743 of the recording area 709 is recorded. Management information is stored in the memory. For this reason, the additional data 715 and 716 on the optical disk 106 cannot be read onto the memory.

  Therefore, the management information on the memory is recorded as a temporary data file 733 in an arbitrary free area (recording area 719 in FIG. 1) of the recording medium, and this recording location is used as the last additional data for storing the additional data on the memory. Store in the data table (S110). Next, the position of the first additional data area 715 is acquired from the additional data storage location data table, and seek is performed to the first additional data area 717 in the after-recording file 732 (S111). Next, the additional data is read (S112), and the read additional data is added to the management information file 730 (S113).

  Next, it is determined whether or not all the additional data has been recorded in the management information file 730 from the additional data storage location data table (S114). If the recording has been completed, the process proceeds to step S117.

  On the other hand, if all the additional data has not been recorded, the position of the next additional data area is acquired from the additional data storage location data table, and seek is performed to the next additional data area in the after-recording file 732 (S115). Thereafter, steps S112 to S115 are repeated until all the additional data in the after-recording file 732 and the temporary data file 733 have been recorded in the management information file 730. Here, for the last additional data, the position of the last recorded additional data area in the additional data storage location data table is acquired, and the data in the recording area 719 on the optical disc 106 is recorded in the management information file 730. Is done.

  Then, the AV stream data file 731, the management information file 730, and the after-recording file 732 are closed, and the AV stream data recording process is terminated (S 117).

  As described above, since the data recording apparatus 10 of the present embodiment records management information data in the PRU area, it is not necessary to secure another recording area in order to record the management information data. Further, since the management information data is recorded in the recording area in the set, it is not necessary to perform a seek operation in order to record in the recording area outside the management information data set. Therefore, the delay caused by the recording of the management information data can be suppressed, so that the size of the AV stream data can be suppressed and the utilization efficiency of the optical disc 106 can be improved.

  Further, by recording management information exceeding the memory size in the PRU area, it is possible to record AV stream data for a long time even in an apparatus having a small memory size. In addition, the continuous recording length of the CU can be made shorter than when the additional data is recorded in an area different from the CU, and the destructive editing unit of the AV stream data can be specified in a finer unit. It becomes.

  Further, after the additional data is recorded in the after-recording file 732 that is data in all the PRU areas, the recording of the AV stream data is completed, and the management information file 730 is generated, the additional data in the data in the after-recording file 732 is added. By considering the data as dummy data, the additional data is overwritten with the after-record data when the after-recording process is performed. Therefore, it is not necessary to perform a special process such as deleting the additional data after the AV stream data recording is completed.

  In the present embodiment, the contents of the memory are recorded on the recording medium in units in which the secured memory is full, but from the start of recording AV stream data as in the case of YES in step S109 of FIG. When all the management information up to the end is within the reserved memory size, it is not necessary to record the contents of the memory on the recording medium during AV stream data recording.

  Next, the format of QuickTime management information will be described with reference to FIGS. First, atom, which is a common information storage format, will be described.

  At the beginning of an atom, there is always an Atom size that is the size of the atom and Type that is the type information of the atom. Type is distinguished by 4 characters. For example, in the Movie atom shown in FIG. 8, it is “moov”, and in the Movie data atom, it is “mdat”. There is a hierarchical structure between atoms, and each atom can contain another atom.

  FIG. 8 shows the structure of the Movie atom. In this structure, “Movie header atom” manages the overall attributes of the movie managed by the Movie atom. “Track atom” stores information about a track such as video and audio included in the movie. “User data atom” is an atom that can be defined independently by the user.

  FIG. 9 shows the configuration of the Track atom. “Track header atom” manages the overall attributes of the track. “Edit atom” manages which section of media data is played back at which timing of the movie. “Track reference atom” manages the relationship between this track and another track. “Media atom” manages actual video and audio data.

  FIG. 10 shows the configuration of the Track header atom. Here, only what is necessary for later description will be described. “Flags” is a set of flags indicating attributes. A typical example is a Track enabled flag. If this flag is 1, the track is reproduced, and if it is 0, the track is not reproduced. “Track ID” is a track-specific ID. “Layer” represents the spatial priority of the track. If there are a plurality of tracks on which an image is displayed, the track with the smaller layer value is displayed in front.

  FIG. 11 shows the configuration of the Media atom. “Media header atom” manages overall attributes and the like related to media data managed by the Media atom. “Handler reference atom” stores information indicating which decoder decodes the media data. “Media information atom” manages attribute information unique to media such as video and audio.

  FIG. 12 shows the configuration of the Media information atom. “Media information header atom” manages attribute information unique to media such as video and audio. “Handler reference atom” is the same as that included in the aforementioned Media atom. “Data information atom” includes “Data reference atom” which is an atom for managing the name of a file including media data referred to by the QuickTime movie. “Sample table atom” manages data size, playback time, and the like.

  Next, the sample table atom will be described. Before that, a data management method in QuickTime will be described with reference to FIG. In QuickTime, the minimum unit of data (for example, a video frame) is called a sample. Samples are assigned numbers (sample numbers) starting from 1 in the order of playback time, such as # 1, # 2,..., #I,.

  In the QuickTime format, the playback time length and data size of each sample are managed. An area in which samples belonging to the same track are continuously arranged in the file in the order of playback time is referred to as a chunk. Chunks are also numbered from 1 in order of playback time, as with samples. That is, in the QuickTime format, one file 901 is formed by sequentially arranging chunks in this way.

  Furthermore, in the QuickTime format, the address from the beginning of the file in each chunk and the number of samples included in each chunk are managed. Based on these pieces of information, it is possible to obtain the position of the sample corresponding to an arbitrary time.

  FIG. 14 shows the configuration of the Sample table atom. “Sample description atom” manages the data format (Data format) of each chunk, the index of the chunk of the file in which the sample is stored, and the like. “Time-to-sample atom” manages the playback time of each sample. “Sync sample atom” manages samples that can start decoding among individual samples. “Sample-to-chunk atom” manages the number of samples included in each chunk. “Sample size atom” manages the size of each sample. “Chunk offset atom” manages the address of each chunk from the beginning of the file.

  FIG. 15A shows the configuration of the Sample description atom. “Number-of-entries” represents the number of data formats used, and there are as many sample description tables as there are. FIG. 15B shows a configuration example of an audio sample description table.

  FIG. 16 shows the configuration of the Edit atom. The Edit atom includes one Edit list atom. The Edit list atom has a set (entries) of “Track duration”, “Media time”, and “Media rate” as many as the number specified by Number of entries. Each entry corresponds to a section that is continuously played back on the track, and is arranged in the order of playback time on the track.

  Track duration represents the playback time on the track in the section managed by the entry. Media time represents the position on the media data corresponding to the head of the section managed by the entry. Media rate represents the playback speed of the section managed by the entry. When Media time is −1, the playback of the sample on the track is stopped for the track duration of the entry. This section is called empty edit.

  FIG. 17 shows an example of using the Edit list. Here, it is assumed that the content of the Edit list atom is the content shown in FIG. 17A and the configuration of the sample is the configuration shown in FIG. Here, the track duration of the i-th entry is D (i), the media time is T (i), and the media rate is R (i). At this time, the actual sample reproduction is performed in the order shown in FIG. This will be briefly described.

  First, since entry # 1 is 13000 for D (1), 20000 for T (1), and 1 for R (1), the section 13000 from the beginning of the track is the section from time 20000 to 33000 in the sample. Play. Next, since entry (D2) is 5000 for D (2) and -1 for T (2), no reproduction is performed in the section from time 13000 to 18000 in the track ("" in FIG. 17 (c)). null ”). Since entry # 3 has D (3) of 10000, T (3) of 0, and R (3) of 1, entry # 3 has an interval from time 0 to 10000 in the sample in the section from time 18000 to 28000 in the track. Play the section.

  FIG. 18 shows the configuration of the User data atom. This atom can store any number of unique information not defined in the QuickTime format. One unique information is managed by one entry, and one entry is composed of “Atom size”, “Type”, and “User data”. Atom size represents the size of the entry itself, Type represents identification information for distinguishing unique information, and User data represents actual data.

  In addition, one special file called an index file for managing QuickTime movies included in the disc is arranged in the disc. In the index file, thumbnails and various attributes relating to files on the disc (such as QuickTime movies and still images referenced from QuickTime movies) are registered.

  Among the various attributes is a link count that indicates the number of times the file has been externally referenced. By referring to this link count, you can easily know whether there is a file that refers to the file, and prevent accidental deletion of files referenced by others. Can do.

  In the above embodiment, the time when the memory size reserved in the data recording device 10 is exceeded is detected, and the management information on the memory is recorded as additional data in the PRU area on the optical disc 106. As long as the amount of management information does not exceed the memory size secured in advance, the management information on the memory is recorded as additional data in the PRU area at a predetermined timing such as a predetermined cycle, a predetermined amount, and a predetermined memory occupancy rate. May be.

  For example, by recording the management information in the PRU area at a specific cycle, the AV stream data up to the point where the management information is recorded in the PRU area and the management information are recorded on the recording medium. Thereby, even when the supply of power to the data recording apparatus 10 is suddenly stopped, the recorded content can be retained and reproduced, so that there is an effect of taking measures against power interruption.

  The management information stored in the memory may be recorded in the PRU area in units related to the content of the AV stream data. Units related to the contents of AV stream data include AV stream data scenes and chapters, and minimum continuous recording units of AV stream data.

  Specifically, during recording of AV stream data, a name to be added to a scene or chapter, position information to be divided, summary information thereof, and the like are recorded in the PRU area together with management information. When all management information is generated after AV stream data is recorded, scene and chapter information recorded in the PRU area is simultaneously recorded as management information data.

  In this way, by recording scene and chapter information while recording AV stream data, when the recorded AV stream data is played back, what kind of content or configuration is the entire content of the AV stream data? This is useful for quickly searching for a desired playback position in the AV stream data.

  Further, as information related to the content of the AV stream data, management information includes link information such as a file name indicating AV data such as still image data, text data, music / audio data, and video data related to the content of the AV stream data. May be recorded in the PRU area.

  This makes it possible to add the AV data to be reproduced in synchronism with the AV stream data and the position information to be reproduced in synchronism while recording the AV stream data, thereby improving the convenience for the user.

  The AV stream data scenes and chapters are separated by sending the AV stream data to a display output means such as a display while recording the AV stream data, and performing the display output. The user refers to the display output. Then, when it is determined that the separation is detected, the separation may be detected by notifying the data recording apparatus 10 using an input unit such as a keyboard. The same applies to the case of recording link information to still images, text, music / audio data, and video data.

  Thereby, during recording of AV stream data, information relating to reproduction of the recorded AV stream data and the content of the data can be freely performed at a timing desired by the user. For example, a function of taking a memo during recording Can provide. In addition, when the user performs final division work of these scenes and chapters after recording AV stream data, the memo function added during recording can be performed smoothly.

  Similarly, in the above embodiment, management information on the memory may be recorded in the PRU area on the recording medium based on an instruction from the user by the input means. Thus, a backup of management information related to the recorded AV stream data can be recorded at the user's discretion. In addition, the user can freely perform the backup timing based on the importance of the content of the recorded AV stream data.

  In the above embodiment, when the memory size secured in the recording device is exceeded, the management information on the memory is recorded as additional data in the PRU area on the recording medium. The acceleration applied to the apparatus may be detected, and when the detected acceleration is large, the management information on the memory may be recorded as additional data in the PRU area on the recording medium. Further, when the remaining capacity of the battery of the data recording device is detected and the detected remaining capacity of the battery decreases, the management information on the memory may be recorded as additional data in the PRU area.

  As described above, the additional data may be recorded in the PRU area based on the timing detected by various detection means. Thereby, during recording of AV stream data, it is possible to prevent a recording process failure due to an impact applied to the data recording device and loss of additional data on the memory due to power interruption.

  In the above embodiment, as shown in FIG. 1, there is a PRU area in which management information is not recorded as additional data. However, management information related to AV stream data in a certain CU is stored in the next CU. By recording in the PRU area, management information may be recorded as additional data in the PRU areas in all CUs except the first CU.

  As a result, since management information is created for each AV stream data, editing operations such as data copying, moving, and insertion processing can be performed in units of AV stream data. Therefore, it is possible to edit only by manipulating the data in the CU without interpreting the management information that is collectively managed from the start to the end of the recording of the AV stream data, and without manipulating the data.

  In the above embodiment, AV stream data management information is used as additional data to be recorded together with AV stream data. This additional data includes still image data, text data, music / audio data, video data, and the like. Any data that is reproduced in synchronism with the reproduction of AV stream data can be used.

  By recording data to be played back in synchronization with AV stream data in the PRU area, it is possible to continuously read out data to be played back and AV stream data when playing back AV stream data. It becomes. Therefore, since the read head seek does not occur, the power consumption is reduced and the operation sound of the data recording apparatus is reduced.

  In the above embodiment, the additional data to be recorded in the PRU area is data used for recording and reproduction of AV stream data. However, data that is not used for recording and reproduction of AV stream data may be recorded. . Such additional data includes data from an external device connected to a device that records and reproduces AV stream data via a network, program data from broadcasting by satellite, terrestrial broadcasting, and the like.

  Data from the former external device includes control information for controlling a device that records and reproduces AV stream data, and AV content such as video, audio, still image, and text. In addition, a video camera is an example of a device that records and reproduces AV stream data and an external device.

  As an application example using these video cameras, it is possible to simultaneously record video from a different external video camera while shooting video with one video camera, or shooting control information of one video camera. Is stored from a different video camera through a network, and one video camera performs a shooting operation based on the recorded shooting control information program. In addition, there is a method of temporarily recording the content of a message when it is desired to convey a message to a photographer through a mobile phone while shooting with a video camera.

  In this case, by recording the data recorded by the external device via the network while the device that records and reproduces the AV stream data records the AV stream data, the data of the external device is simultaneously recorded in the AV stream. It can be saved on the device that records the data. Further, since the recording data of the external device is recorded, it is possible to store the data of the external device as backup data in a device that records and reproduces AV stream data.

  On the other hand, as in the latter case, when recording broadcast or program data such as satellite or terrestrial broadcast included in the additional data during recording of AV stream data, regardless of whether or not AV stream data is recorded, As long as the power is turned on, program data can be recorded. Therefore, even during the recording of AV stream data, it is possible to record a broadcast program or data, and the data being broadcast can be recorded on a recording medium without missing, thereby realizing a reservation recording function. It becomes possible.

  In the above embodiment, as shown in FIG. 1, the contents on the memory, which is additional data recorded on the optical disc 106, are recorded in one file as an after-recording file 732, but the additional data is recorded on the optical disc 106. The additional data may be divided and recorded in a plurality of files, for example, the recording unit may be a single file or the additional data may be distributed and recorded in several files. For example, the additional data recorded in the PRU area is managed as one additional data file as a single file, the free area in the PRU area is managed as an after-record file, and the additional data recorded in the PRU area is managed as a plurality of files. For example, the free area of the PRU area is managed by an after-recording file.

  In this case, by dividing the additional data from the start to the end of recording into a plurality of files and recording, it becomes possible to record in different files on the recording medium in units of recording timing of each additional data. There is an effect that it becomes easy to organize and classify each content.

[Embodiment 2]
Next, another embodiment of the present invention will be described with reference to FIG. In the above embodiment, the recording area is divided for each CU as shown in FIG. 1, but in this embodiment, each CU is continuously arranged on the optical disk 106 as shown in FIG. ing. Note that this embodiment is different from the above embodiment only in the data recording method, and the other configurations are the same, and thus the description thereof is omitted.

  In the above embodiment, the size of the CU is assumed to be equal to or larger than the minimum size capable of seamless recording or reproduction of AV stream data and post-recording data. In the present embodiment, in addition to this, it is necessary to set the size of the CU for interleaving the PRU area at an interval that enables seamless recording or reproduction including post-recording data that is reproduced in synchronization with AV stream data. This is because the AV stream data is continuously recorded on the optical disk 106, and therefore, in the recording form of one PRU area and one AV stream data area, after recording the AV stream data for a long time, the after-recording data is seamlessly recorded. It is impossible to play back in synchronization with.

  Also, regarding the recording of AV stream data, the difference from the above embodiment is that the end position of the first CU 1110 and the start position of the second CU 1111 and the end position of the second CU 1111 are different as shown in FIG. The third CU 1112 is recorded continuously continuously without being divided between consecutive CUs so that the head position of the third CU 1112 is continuous.

  In this processing operation, in FIG. 7, after the end of the recording process of the AV stream data (S104), the seek process to the head of the next CU (S105) is not performed, and the temporary data is recorded in the next PRU area. This can be realized by performing the determination process (S106). As a result, the next CU is recorded continuously from the previous AV stream data recording end position.

  In carrying out this embodiment, it is necessary that a sufficient continuous free space corresponding to the time (data size) of AV stream data to be recorded exists on the optical disc 106. In other words, an optical disc on which no data has been recorded or an optical disc immediately after initialization is desirable.

  As described above, since the CU is continuously recorded, no division occurs between the CUs. Therefore, there is an effect that no seek occurs when recording or reproducing AV stream data. This does not require a wasteful head operation and can reduce power consumption. Further, there is an effect that vibration and moving sound due to the movement of the head are not generated. Furthermore, even when AV stream data is copied to another recording medium, it is possible to read out the AV stream data to be copied at a higher speed than in the case where the division occurs, and to shorten the copy time. Become.

  In addition, since data other than the data related to the recorded AV stream data (PRU area, post-record data, management information, etc.) does not exist between CUs, one related data can be recorded on the optical disc together, thereby improving the efficiency of use of the disc. Can be improved. This is because if the file recording and deletion are repeated on the optical disc, the physical data area of each file is divided finely, leading to a decrease in data access speed. However, by continuously recording CUs, It is possible to reduce the occurrence of the division of the physical data area in each file. Further, when the AV stream data in which the CUs are continuous is deleted, a continuous free area can be created on the optical disc, which is advantageous for the next data recording. is there.

  In the present embodiment, all the CUs are continuously recorded. However, the CUs may be continuously recorded as much as possible, and may be divided and recorded as necessary. As a result, the use efficiency of the disk is further improved in the same manner as described above.

  In the above embodiment, AV stream data relating to video and sound is used as stream data. However, any stream data can be used as long as it is data to be recorded and / or reproduced continuously. .

  In the above embodiment, since the post-record data is read out to the memory before the AV stream data is read out, the PRU area is arranged in front of the AV stream data recording area. You may arrange | position a PRU area | region later.

  In addition, each block of the data recording apparatus 10, in particular, the continuous control unit 120, the management information file creation unit 121, and the partial management information creation unit 122 may be configured by hardware logic, and uses a CPU as follows. It may be realized by software.

  That is, the data recording apparatus 10 includes a CPU (central processing unit) that executes instructions of a control program that realizes each function, a ROM (read only memory) that stores the program, and a RAM (random access memory) that expands the program. And a storage device (recording medium) such as a memory for storing the program and various data. An object of the present invention is a recording medium on which a program code (execution format program, intermediate code program, source program) of a control program of the data recording apparatus 10 which is software that realizes the above-described functions is recorded so as to be readable by a computer. This can also be achieved by supplying the data recording apparatus 10 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include a tape system such as a magnetic tape and a cassette tape, a disk system including a magnetic disk such as a flexible disk / hard disk and an optical disk such as a CD-ROM / MO / MD / DVD / CD-R, and an IC card. A card system such as an optical card (including a memory card) or a semiconductor memory system such as a mask ROM / EPROM / EEPROM / flash ROM can be used.

  Further, the data recording apparatus 10 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Further, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired communication such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth, It can also be used with radio such as 802.11 radio, HDR, mobile phone network, satellite line, and terrestrial digital network. The present invention can also be realized in the form of a carrier wave or a data signal sequence in which the program code is embodied by electronic transmission.

  The present invention can also be configured as follows.

  For example, in the data recording / reproducing method according to the present invention, a data recording / reproducing method for recording, on a recording medium, an area for recording first data composed of at least video or audio and second data synchronized with the first data. In this method, the first data is recorded on the recording medium, and the data different from the first data is recorded in an area for recording the second data. As a result, while recording AV stream data as the first data, it becomes possible to simultaneously record apparently different data from the AV stream data.

  Furthermore, in the data recording / reproducing method according to the present invention, in the above method, the second data is data used for recording or reproducing the first data. This makes it possible to simultaneously record music data, still image data, text data, and the like as the second data while recording the AV stream data as the first data.

  Further, in the data recording / reproducing method according to the present invention, in the above method, the second data used for recording or reproducing the first data is management information necessary for reproducing the first data. . Accordingly, it is possible to simultaneously record the management information of the AV stream data as the second data while recording the AV stream data as the first data.

  Further, in the data recording / reproducing method according to the present invention, in the above method, the second data used for recording or reproducing the first data is a part of management information necessary for reproducing the first data. It is. Thus, by recording management information exceeding the memory size in the PRU area, it is possible to record AV stream data for a long time even in a system with a small memory size. In addition, the continuous recording length of the CU can be made shorter than when the additional data is written in an area different from the CU, and the unit for destructive editing of the AV stream data can be specified in a finer unit. There is an effect of becoming.

  Further, by recording additional data in the after-recording file that is the PRU area, after the recording of the AV stream data is completed and the management information file is generated, the additional data in the data in the after-recording file is set as dummy data. As a result, when the after-recording process is performed, the additional data is overwritten by the after-recording data. Therefore, there is an effect that it is not necessary to perform a special process such as deleting the additional data after the AV stream data recording is completed.

  Furthermore, in the data recording / reproducing method according to the present invention, in the above method, the second data used for recording or reproducing the first data is data reproduced in synchronization with the first data. is there. By recording data to be played back in synchronization with AV stream data in the PRU area, it is possible to continuously read out data to be played back and AV stream data when playing back AV stream data. It becomes. Therefore, since the read head seek does not occur, the power consumption is reduced and the operation sound of the data recording apparatus is reduced.

  Furthermore, the data recording / reproducing method according to the present invention is a method in which, in the above method, the recording of the second data is performed in a region where the second data is recorded at a specific (time) interval. By recording the management information in the PRU area at specific time intervals, the AV stream data up to the point where the management information is recorded in the PRU area and the management information are recorded on the recording medium. The management information is interleaved with the AV stream data and is distributed and recorded in the AV stream data. This is because even if the supply of power to the data recording apparatus suddenly stops, the recorded contents are retained, and there is an effect of taking measures against power interruption.

  Furthermore, in the data recording / reproducing method according to the present invention, in the above method, the recording of the second data is performed in an area where the second data is recorded in a unit related to the content of the first data. Is the method. In this way, by recording scene and chapter information during recording of AV stream data, when the recorded AV stream data is played back, what is the content or configuration of the entire content of the AV stream data? This is useful for instantly searching for a desired playback position in the AV stream data. This makes it possible to add the AV data to be reproduced in synchronism with the AV stream data and the position information to be reproduced in synchronism while recording the AV stream data, thereby improving the convenience for the user.

  Furthermore, the data recording / reproducing method according to the present invention is a method in which, in the above method, the recording of the second data is performed in an area where the second data is recorded according to an instruction from a user or a system. As a result, it is possible to freely perform information related to reproduction of the recorded AV stream data and the content of the data while recording the AV stream data at a timing that the user thinks, and to provide a function of taking a memo during recording. . In addition, when the final division work of these scenes and chapters is performed after the AV stream data is recorded, the memo function added during the recording can be performed smoothly.

  Also, it is possible to record a backup of management information of AV stream data recorded at the user's discretion. Depending on the importance of the content of the AV stream data recorded by the user, the backup timing can be freely performed. Further, by recording the management information on the memory as additional data in the PRU area according to the instruction of the recording / reproducing system, the recording processing failure due to the impact applied to the recording / reproducing system or the power-off memory during recording of AV stream data The loss of the above additional data can be prevented.

  Furthermore, the data recording / reproducing method according to the present invention is a method in which the instruction from the system is instructed by the remaining storage capacity of the memory. By being instructed by the remaining storage capacity of the memory, it is possible to prevent management information from being stored exceeding the memory size.

  Furthermore, the data recording / reproducing method according to the present invention is a method in which, in the above method, the recording of the second data is always performed in an area for recording the second data. By recording management information as additional data in all PRU areas, AV stream data and its management information are recorded together in one CU, so that editing operations such as data copying, moving, and insertion processing are performed on a CU basis. Can be performed. Therefore, it is possible to edit only by manipulating the data in the CU without interpreting the management information that is collectively managed from the start to the end of the recording of the AV stream data, and without manipulating the data.

  Furthermore, in the data recording / reproducing method according to the present invention, in the above method, the second data is data that is not used for recording or reproducing the first data. By recording data that is not used for recording or reproduction of the first data in the second data, it is possible to record data for a completely different purpose from the recording of the first data. Thus, there is an effect that it is possible to have a plurality of functions at the same time in a series of processing called data recording processing.

  Furthermore, in the data recording / reproducing method according to the present invention, in the above method, the second data not related to the first data is data from a broadcast, a network, or an external device.

  When the second data is data from an external device, the device that records and plays back AV stream data records the data recorded by the external device via the network while recording the AV stream data. As a result, the data of the external device can be simultaneously stored in the device that records the AV stream data. Further, since the recording data of the external device is recorded, it is possible to store the data of the external device as backup data in a device that records and reproduces AV stream data.

  On the other hand, when the second data is data from a satellite or terrestrial broadcast, it is possible to record a broadcast program or data even during recording of AV stream data. Can be recorded on a recording medium without missing, so that a reservation recording function can be realized.

  Furthermore, the data recording / reproducing method according to the present invention is a method in which the second data is composed of one file in the above method. By configuring the second data in one file, it is possible to instantly grasp the PRU area to be recorded by interleaving with the first data, and the PRU area can be managed in a simple manner. There is an effect that the PRU area can be easily managed.

  Furthermore, the data recording / reproducing method according to the present invention is a method in which, in the above method, the second data is composed of a plurality of files. By dividing the additional data from the start to the end of recording into a plurality of files and recording, it becomes possible to record in different files on the recording medium in units of recording timing of each additional data. This has the effect of making it easier to organize and classify.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims. Further, the present invention can be obtained by appropriately combining technical means disclosed in different embodiments. Embodiments are also included in the technical scope of the present invention.

  The data recording method in the above embodiment can be applied to recording media such as optical disks, hard disks, and semiconductor memories, and recording / reproducing apparatuses and recording / reproducing systems that record and reproduce data on these recording media.

It is a figure which shows the several file produced when recording AV content in the video disc recorder which is one Embodiment of this invention, and the recording position of the data in these files. It is a block diagram which shows schematic structure of the said video disc recorder. It is a block diagram which shows schematic structure of host CPU and RAM in the said video disc recorder. FIGS. 7A to 7C are diagrams showing the relationship between management information and AV streams in the QuickTime file format. It is a figure which shows the structure of the said AV stream. FIG. 4A is a diagram showing a directory / file configuration, and FIG. 4B is a diagram showing management in the UDF of the directory / file configuration. 4 is a flowchart showing a processing operation for recording AV content on a recording medium in the video disc recorder. It is a figure which shows the structure of Movie atom in the said file format. It is a figure which shows the structure of Track atom in the said Movie atom. It is a figure which shows the structure of Track header atom in the said Track atom. It is a figure which shows the structure of Media atom in the said Track atom. It is a figure which shows the structure of Media information atom in the said Media atom. It is a figure which shows the example of the data management by Sample table atom in the said Media information atom. It is a figure which shows the structure of the said Sample table atom. The figure (a) is a figure which shows the structure of Sample description atom in the above-mentioned Sample table atom, The figure (b) shows the example of composition of the Sound Sample description Table of audio among Sample description Tables in the above-mentioned Sample description atom. FIG. FIG. 4A is a diagram showing the configuration of the Edit atom in the Track atom, and FIG. 4B is a diagram showing the configuration of the Edit list atom in the Edit atom. FIGS. 9A to 9C are diagrams showing an example of reproduction range designation by the Edit atom. It is a figure which shows the structure of User data atom in the said file format. It is a figure which shows the several file created when recording AV content in the video disc recorder which is other embodiment of this invention, and the recording position of the data in these files. It is a figure which shows the some recording file created when recording AV content in the conventional video disc recorder, and the recording position of the data in these files.

Explanation of symbols

10 Video disc recorder (data recording device)
102 RAM
106 Optical disc (recording medium)
120 Continuous recording control unit (recording control means)
121 Management information file creation unit (specific data movement control means)
122 Partial management information creation unit (recording control means)
700 to 704, 1100 to 1104 PRU area (recording area for post-recording data)
705 to 709, 1105 to 1109 Recording area of AV stream data (stream data) 710 to 714, 1110 to 1114 CU (set)
720, 1120 Management information recording area 730, 1130 Management information file (file)

Claims (16)

Recording of stream data that is data to be continuously recorded and / or reproduced and securing a recording area for post-recording data that is data that is reproduced in synchronization with the stream data and recorded later are set as one set. In a data recording apparatus comprising a recording control means for continuously performing recording on a recording medium and controlling this to be performed for a plurality of sets.
It said recording control means, in a certain set, performs recording of the stream data, a data different from the stream data, records the relevant data is data associated with the stream data in the recording area of the after-recording data Control to
The recording control means performs control so that unrecorded related data is collectively recorded in a certain set among the plurality of related data related to the plurality of stream data recorded before the set. And
The recording control means, after performing a plurality of sets of recording, moves the related data recorded in the plurality of post-recording data recording areas to a recording area different from the stream data and post-recording data recording areas. And a related data movement control means for controlling the data recording apparatus.   2. The data recording apparatus according to claim 1, wherein the related data is dummy data meaningless as the post-record data. Said recording control means is the set of records from a record of the relevant data to the previous after a predetermined period of time, the data recording apparatus according to claim 1, wherein the controller controls so as to record the relevant data. A storage means for storing related data;
2. A data recording apparatus according to claim 1 , wherein said recording control means controls to record related data accumulated in said storage means when a decrease in the remaining capacity of said storage means is detected. . An input means for the user to input information;
2. The data recording apparatus according to claim 1 , wherein the recording control unit performs control so as to record the related data based on information of a writing instruction from the input unit. It further comprises a status detection means for detecting the status of the device,
2. The data recording apparatus according to claim 1 , wherein the recording control unit performs control so as to record the related data based on detection by the situation detection unit. 2. The data recording apparatus according to claim 1, wherein the recording control unit performs control so as to record one management file for managing the plurality of sets of related data. The data recording apparatus according to claim 1, wherein the recording control unit controls to record a plurality of management files for managing the plurality of sets of related data. An input means for the user to input information;
The data recording apparatus according to claim 1, wherein the related data is input data from the input unit. 2. The data recording apparatus according to claim 1 , wherein the related data is management information necessary for reproducing the stream data. 2. The data recording apparatus according to claim 1 , wherein the related data is data reproduced in synchronization with the stream data. 2. The data recording according to claim 1 , wherein the recording control means controls to record a certain set of related data in a recording area of post-recording data secured in a set after the set. apparatus. 2. The data recording apparatus according to claim 1 , further comprising related data acquisition means for acquiring the related data from the content of the stream data. Recording of stream data that is data to be continuously recorded and / or reproduced and securing a recording area for post-recording data that is data that is reproduced in synchronization with the stream data and recorded later are set as one set. In a data recording method for continuously performing recording on a recording medium and performing this for a plurality of sets,
In some sets, along with the recording of the stream data, a data different from the stream data, the related data is data associated with the stream data recorded in the recording area of the after-recording data,
In a certain set, unrecorded related data among a plurality of the related data related to the plurality of stream data recorded before the set is collectively recorded,
Data recording characterized in that after a plurality of sets of recording are performed, related data recorded in a plurality of the recording areas for the after-recording data is moved to a recording area different from the recording area for the stream data and the after-recording data Method. A data recording program for operating the data recording apparatus according to any one of claims 1 to 13, the data recording program for causing a computer to function as the recording control means. A computer-readable recording medium on which the data recording program according to claim 15 is recorded.

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