JP2007018631A - Data recorder and its control method, data recorder control program, and recording medium whereon this program is recorded - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a data recorder in which the data amount losing when a recording error is generated is small. <P>SOLUTION: The data recorder 10 is equipped with a data recording section 34 for recording stream data on the random accessible recording medium 14 as a stream file. The data recording section 34 records the stream data on the recording medium 14 as a new file when the recording error is generated, and the recording is continued. Thereby, a processing period to the reopening of the recording operation is short, and the stream data losing by the recording error can be reduced. Since an error generated position of the error generated file is easily retrieved from an end of the file by means of recording the stream data after the generation of recording error as the new file on the recording medium 14, the processing time can be reduced when an error restoring process 5 is carried out later. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a data recording apparatus, a control method therefor, a data recording apparatus control program, and a recording medium on which the program is recorded. In particular, the present invention relates to a data recording apparatus for recording video data and audio data as stream data in real time on a randomly accessible recording medium such as a hard disk or an optical disk.

  Conventionally, in a recording apparatus using a magnetic disk such as a hard disk or a medium such as CD / MO / MD / DVD as a recording medium, a recording error is reduced by performing a verification operation when recording data on the recording medium. The method is widely used. In particular, in an optical recording medium such as an optical disk, a recording error often occurs due to dust, dirt, or a defect on the disk.

  When recording data that does not require real-time performance, it is normal to read the recorded data once to detect an error and then re-record it if there is a recording error. Is preventing.

  However, in the recording of data such as stream data that requires real-time characteristics, if the recording process is interrupted by the verify process, the data during that time cannot be recorded and is lost.

  In order to solve this problem, the method of limiting the number of retries of the verify process or the transfer speed to the recording medium is generally faster than the bit rate of the stream, so the recording process to the recording medium is not always performed. In addition, there is known a method of using the fact that there is a period during which the recording process is interrupted and performing the verify process only during this period (for example, see Patent Document 1).

  On the other hand, if there is some error in the bitstream, block noise will be generated in the reproduced image, and it can be said that there are few problems in viewing. Therefore, in order to record data in real time, verify processing is performed. There is no way to do it.

  It is widely used in DVD-RAM drives and the like because it is effective when recording high bit rate stream data in real time or at high speed dubbing. Also in this method, since a recording error such as an address detection error or a control error can be detected, the reliability is not greatly reduced.

  By not performing verification processing, real-time data can be recorded at high speed. However, if a recording error such as an address detection error occurs, the recording processing is interrupted due to error processing, and it is lost without being recorded. Data to be output.

  This problem will be specifically described with reference to FIG. FIG. 10 is a schematic diagram showing the occurrence of a recording error in the prior art.

  As shown in the figure, the stream data is transferred to the buffer 12 and is recorded on the recording medium 12 when the data stored on the buffer 12 exceeds a predetermined amount. Usually, since the transfer speed to the recording medium 14 is faster than the bit rate of the stream, the time required to actually record on the recording medium 14 is shorter than the time accumulated in the buffer 12. When the data recording apparatus detects a recording error at time t1, the data recording apparatus stops the transfer of the stream data.

  In a recording medium such as an optical disk, when there is a defect in the disk, recording and reproduction are very likely to fail in the vicinity where a recording error has occurred. Some errors cause little trouble in viewing, but if errors occur continuously, the decoder may not operate normally and playback may not be continued. For this reason, the data recorded before the error occurrence position is reproduced to verify whether or not the data is normally recorded, and the data is deleted retroactively to the position where the data can be normally recorded.

  After the error processing is completed, transfer of stream data is resumed at time t2. Therefore, in addition to the deleted data section, the stream data whose transfer is interrupted for error processing is also lost.

  Here, what data unit is conventionally recorded on a recording medium such as an optical disk will be described with reference to FIGS.

  FIG. 11 is a conceptual diagram showing data recorded on a recording medium such as an optical disk in the prior art.

  As shown in the figure, data is written on the recording medium 14 in units of ECC (Error Collecting Code) blocks 61. The ECC block 61 is composed of sectors 71. Each sector 71 is composed of 2048 bytes, and 32 sectors constitute one ECC block 61 in order to perform error correction.

  ECC is a system that encrypts data and records redundant data on a disk medium during pre-mastering. The redundant data is used at the time of reproduction, and is used to detect and correct errors that occur during data transfer.

  An ECC block is a minimum unit for writing on a recording medium such as an optical disk, and a technique of making 16 sectors into one ECC block is widely used in order to make error correction more robust. In the present invention, 32 sectors are defined as one ECC block 61, and recording is performed on a recording medium in units of ECC blocks 61.

  FIG. 12 is a conceptual diagram showing a correspondence relationship between a GOP (Group Of Picture) 61 and an ECC 71 recorded on a recording medium in the prior art.

  GOP is a video encoding algorithm defined in MPEG-1 and MPEG-2, and means a combination of several frames of a video signal that is a unit for compression, reproduction, and editing.

  Each GOP 71 is recorded on the recording medium across the ECC 61 which is a recording unit on the recording medium.

  In a compressed image using MPEG (Moving Picture Experts Group), random access is possible in units of GOP, and in MPEG-2, access in units of fields is also possible.

  An I picture (Intra-coded Picture) that is an intra-frame coded frame that encodes an input signal as it is, a P picture (Predictive-coded Picture) that is an inter-frame coded frame using bidirectional prediction, and unidirectional motion compensated prediction A group of B pictures (Bidirectionally Predictive-coded Pictures), which are frames interpolated and encoded using G, is a unit of encoding called GOP.

  By recording the head position of the GOP as stream management information, it becomes possible to access and reproduce the decodable data at high speed.

  In MPEG-2, time information PTS (Presentation Time Stamp) for displaying a corresponding frame in stream data is added for each frame.

  By recording the PTS as stream management information, it is possible to access the stream data for reproduction from a desired time.

  When the stream data is divided due to a recording pause or the like, the PTS reference time may become discontinuous, and the stream data decoding process may not be performed normally. In order to perform decoding normally, information indicating that the data is discontinuous is required.

Based on the above, in the recording apparatus that buffers the supplied stream data, reads the stream data on the buffer, and records it on the recording medium, the stream data recorded on the recording medium is read to detect a recording error In this case, if recording error is detected and recording on the recording medium is interrupted, the buffered stream data is deleted, buffering of the stream data is newly started, recording is continued, and data is not recorded. A method has been proposed in which a flag indicating continuousness is recorded so that decoding can be performed normally even during reproduction (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 11-53845 (Publication date: February 26, 1999) JP 2002-185921 A (publication date: June 28, 2002)

  However, in each of the above conventional methods, since the operation of reproducing the data recorded when a recording error occurs and the verify process for detecting the error are repeated, it takes a long time to interrupt the data recording, and a large amount of data is lost before the recording process is resumed. The problem of becoming.

  Further, in the configuration of Patent Document 2 described above, in the method that does not perform the verification process, it is necessary to delete the stream data retroactively to the point where the recording was normally performed when the recording error occurred, and similarly, the error process takes time. There arises a problem that the amount of data lost before resuming the recording process increases.

  Even if the error recovery process is performed after the end of recording to reduce the time to resume recording, it is necessary to delete the middle part of the stream file. Arise.

  The present invention has been made in view of the above problems, and its object is to reduce the time from the occurrence of a recording error to the resumption of recording even when a recording error occurs, so that the data in which the recording error has occurred can be naturally reproduced. It is an object of the present invention to provide a recording apparatus that can be easily repaired in a form.

  In order to solve the above problem, the data recording apparatus of the present invention records the stream data as a new file when a recording error occurs in a data recording apparatus that records stream data as a stream file on a randomly accessible recording medium. Is recorded on the recording medium, and a data recording unit for continuing the recording is provided.

  According to the above configuration, when a recording error to the recording medium occurs, recording to the recording medium as a new file is continued without performing error processing such as normal file writing confirmation or verification processing on the spot. Therefore, the processing time until the recording is restarted is short, and the stream data lost due to the recording error can be reduced.

  In addition, by recording the stream data after the occurrence of the recording error as a new file on the recording medium, the error occurrence position of the file in which the error has occurred can be easily searched from the end of the file. In this case, the processing time can be shortened.

  The data recording apparatus of the present invention further includes a buffer for buffering the stream data before recording the stream data on the recording medium, and the data recording unit is buffered in the buffer when a recording error occurs. It is preferable to record the stream data as a new file on the recording medium starting from the portion recorded on the recording medium before the recording error occurs.

  According to the above configuration, the data remaining in the buffer can be used to record as a new stream file from data slightly before the time when the recording error occurred, so the portion lost due to the recording error is complemented. This has the additional effect of minimizing data loss due to recording errors.

  In the data recording apparatus of the present invention, a management information generation unit that generates stream management information including stream information necessary for reproduction control of stream data by analyzing the stream data, and management information including the stream management information And a memory for temporarily storing, wherein the data recording unit further records the management information on the memory on the recording medium after the recording of the input stream data to the recording medium is completed. It is preferable to do.

  According to the above configuration, when a recording error of the stream data in the recording medium occurs, the information of the file in which the error has occurred is stored in the memory, and the recording of the stream data is continued without delay. There is an effect that the restoration process can be speeded up.

  In addition, since the stream management information correction process can be performed on the memory, the reading and writing at the time of the correction process become faster, and the repair process can be speeded up.

  Further, since the correction process is performed on the memory and only the finally determined data is recorded on the recording medium, the access to the recording medium is reduced and the life of the recording medium is extended.

  In addition, the stream management information temporarily stored in the memory can be used to perform an error recovery process in consideration of the connection between the preceding and subsequent data.

  In the data recording apparatus of the present invention, it is preferable that the management information generation unit further generates error management information when a recording error occurs, and the management information includes the error management information.

  According to the above configuration, when a recording error to the recording medium occurs, the error occurrence state is recorded in the memory, the stream data recording is continued without delay, and the recovery process when the recording error occurs is accelerated. There is an effect that can be.

  In addition, when the series of processing is completed, it is possible to perform the repair processing of the stream file in which the recording error has occurred and the stream management information by using the information on the error occurrence status recorded on the memory.

  In the data recording apparatus of the present invention, it is preferable that the error management information includes an identifier for identifying a stream file recorded when a recording error occurs.

  According to the above configuration, when the restoration process of the stream file and the stream management information is performed after the data is determined, there is an additional effect that a file that needs to be restored can be easily identified.

  In the data recording apparatus of the present invention, it is preferable that the error management information includes an identifier for identifying two stream files recorded before and after a recording error occurs.

  According to the above configuration, since it is possible to specify a stream file that is divided into two or more due to a recording error and recorded on the recording medium, one stream file that is continuously played after the end of the recording process There is a further effect that the processing can be performed.

  In the data recording apparatus of the present invention, it is preferable that the error management information includes an error occurrence position in the stream data recorded when a recording error occurs.

  According to the above configuration, since the recording error occurrence position is recorded in the memory as error management information, when performing the error repair process after the recording process is completed, it is easy to search for a part to be deleted / corrected in the repair process. There is an additional effect that the restoration process can be speeded up.

  In the data recording apparatus of the present invention, after the recording of the input stream data to the recording medium is completed, the stream data in which the recording error has occurred on the recording medium is repaired with reference to the error management information, A recording error repair unit that updates the corresponding management information on the memory, and the data recording unit stores the management information that has been repaired on the memory when the recording error repair process is completed; Recording on a recording medium is preferable.

  According to the above configuration, since stream management information and error management information are stored in the memory, it is possible to perform error repair processing on the memory, and to speed up reading and writing for repair. There is a further effect.

  In addition, since error correction processing is performed on the memory, only the final stream management information after error correction is recorded on the recording medium, so unnecessary access to the recording medium can be reduced and the life of the recording medium can be extended. There is a further effect of being able to.

  In the data recording device of the present invention, the recording data restoration unit continuously reproduces the two stream files recorded before and after the point at which the recording error occurs when all of the recording error restoration processes are completed. It is desirable to have a series of files to perform.

  According to the above configuration, two or more files divided due to a recording error on the recording medium can be associated as files to be continuously played back, and can be handled as if one file had no error. There is a further effect.

  In order to solve the above problem, the data recording apparatus control method of the present invention is a data recording apparatus control method for recording stream data as a stream file on a randomly accessible recording medium, and when a recording error occurs. And recording the stream data on the recording medium as a new file and continuing the recording.

  According to the above method, when a recording error to the recording medium occurs, recording to the recording medium as a new file is continued without performing error processing such as normal file writing confirmation or verification processing on the spot. Therefore, the processing time until the recording is restarted is short, and the stream data lost due to the recording error can be reduced.

  In addition, by recording the stream data after the occurrence of the recording error as a new file on the recording medium, the error occurrence position of the file in which the error has occurred can be easily searched from the end of the file. In this case, the processing time can be shortened.

  In the control method of the data recording apparatus of the present invention, the data recording apparatus further includes a memory for temporarily storing management information, and is necessary for reproduction control of stream data by analyzing the stream data. Generating stream management information including stream information, temporarily storing the stream management information in a memory as a part of the management information, and the management on the memory after the recording of the input stream data to the recording medium is completed Preferably, the method further includes a step of recording information on the recording medium.

  According to the above method, when a recording error of the stream data on the recording medium occurs, the information of the file in which the error has occurred is stored in the memory, and the recording of the stream data is continued without delay. There is an effect that the restoration process can be speeded up.

  In addition, since the stream management information correction process can be performed on the memory, the reading and writing at the time of the correction process become faster, and the repair process can be speeded up.

  Further, since the correction process is performed on the memory and only the finally determined data is recorded on the recording medium, the access to the recording medium is reduced and the life of the recording medium is extended.

  In addition, the stream management information temporarily stored in the memory can be used to perform an error recovery process in consideration of the connection between the preceding and subsequent data.

  Each unit in the data recording apparatus can be executed on a computer by a data recording apparatus control program. Further, by storing the data recording device control program in a computer-readable recording medium, the data recording device control program can be executed on any computer.

  When a recording error occurs, the storage device of the present invention records the stream data as a new file on the recording medium and continues the recording. Therefore, the processing time until the recording is restarted is short, and the stream data lost due to the recording error is recorded. There is an effect that it can be reduced.

  In addition, since the error occurrence position of the file in which the error has occurred can be easily searched from the end of the file, there is an effect that the processing time can be shortened when error correction processing is performed later.

  The data recording apparatus of the present invention includes a memory for temporarily storing management information, and records the management information on the memory on the recording medium after the recording of the input stream data to the recording medium is completed. Therefore, when a recording error occurs, the information of the file in which the error has occurred is stored in the memory, the recording of the stream data is continued without delay, the recovery process when the recording error occurs is accelerated, the repair process is accelerated, There is an effect that the life of the recording medium can be extended and an error recovery process can be performed in consideration of the connection between the preceding and subsequent data.

[Embodiment 1]
An embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 shows an embodiment of the present invention, and is a block diagram showing a schematic configuration of each part of a data recording apparatus.

  The recording apparatus 10 of this embodiment includes a buffer 12, a recording medium 14, a memory 16, a data input unit 18, a stream control unit 20, a recording control unit 30, and a management information control unit 40.

  The buffer 12 is a high-speed memory for temporarily storing the input stream data and recording it on the recording medium 14 via the recording control unit 30, for example, a FIFO (First In First Out) type memory.

  In the present embodiment, the stream data refers to a series of data that is transferred so that a video (moving image) with high real-time characteristics flows without interruption.

  The recording medium 14 is, for example, a recording medium using a magnetic disk such as a hard disk or a medium such as CD / MO / MD / DVD. The recording medium 14 records a stream file in which stream data is recorded, a stream management information file in which stream management information data is recorded, and file management information (so-called TOC) data including information on the position and size of the file. Is done.

  The memory 16 is for temporarily storing stream management information, error management information, file management information including information on the position and size of each file recorded on the recording medium 14, and other information.

  In this embodiment, a set of related stream data, stream management data, and error management data is called a title, and data included in the same set is called an identical title.

  The stream management information is information for smoothly reproducing the corresponding stream data. For example, the GOP head position information of the stream data indicated by the packet number from the head of the file, the total number of packets, and the elements included in the stream data. It includes information on the mental stream and other stream information.

  The error management information is information indicating the occurrence status of a recording error when a recording error occurs. An error occurrence flag for identifying the occurrence of an error, an identifier for identifying the stream file in which the error has occurred, and a plurality of files depending on the occurrence of the error An identifier for identifying the stream file recorded separately is included. In addition to the above, title name, recording start time, playback time length, display time (presentation time) information indicating playback start and playback end, identifier of stream management information, error occurrence position on stream file, and other information May be included.

  The correspondence relationship between the stream management information data and the error management data will be described later in detail.

  The data input unit 18 is connected to the outside and inputs stream data such as audio and video.

  The stream control unit 20 analyzes the stream data received from the data input unit 18 to create stream data and stream analysis data, transfers the stream data to the buffer 12, and transfers the stream analysis data to the management information control unit 40. To do. When a predetermined amount of stream data is accumulated in the buffer 12, the stream control unit 20 transfers the stream data to the recording control unit 30. The stream control unit 20 includes a stream analysis unit 22 and a buffer monitoring unit 24.

  The stream analysis unit 22 is for analyzing the input stream data and transferring it to the management information control unit 40. The stream analysis unit 22 analyzes the compression-encoded stream data. For example, in moving image data encoded by MPEG-2 (Moving Picture Image Coding Expert Group-2), the GOP start position and the GOP head frame The display time information (PTS) and other stream information are analyzed to generate stream analysis data.

  The buffer monitoring unit 24 monitors the buffer 12 and issues an instruction to transfer the stream data temporarily stored in the buffer 12 to the recording control unit 30 when the stream data temporarily stored in the buffer 12 reaches a predetermined amount. Is for.

  The recording control unit 30 records various management information data including the stream data transferred from the buffer 12 and the stream management information, error management information, and file management information transferred from the memory 16 on the recording medium 14. Is. The recording control unit 30 includes a recording error detection unit 32 and a data recording unit 34.

  The recording error detection unit 32 monitors the recording process to the recording medium 14, and when a recording error occurs, an error detection signal that reports the occurrence of an error is sent to the stream control unit 20, the management information control unit 40, and the data recording unit 34. To send to.

  The data recording unit 34 is for recording the stream data transferred from the buffer 12 and the management information data transferred from the memory 16 on the recording medium 14. When an error detection signal is transmitted by the recording error detection unit 32, the data recording unit 34 interrupts recording of the currently recorded stream file, and the currently received stream data is recorded as a new stream file. 14, and performs processing for notifying the management information generating unit 41 of the recording position data of the new stream file on the recording medium 14.

  The management information control unit 40 processes the stream analysis data received from the stream analysis unit 22 and the error detection signal and recording position data received from the recording control unit 30 and transfers them to the memory 16 as management information. The management information control unit 40 includes a management information generation unit 42 and an error repair unit 44.

  The management information generation unit 42 generates stream management information based on the stream analysis data from the stream analysis unit 22. Further, the management information generation unit 42 generates error management information based on the error detection signal from the recording error detection unit 32 and the recording position data from the data recording unit 34. The generated stream management information and error management information are transferred to the memory 16. The management information generation unit 42 may create file management information for the recording medium 14 based on the received data.

  The error recovery unit 44 is for correcting the stream file recorded on the recording medium 14 and the file management information of the recording medium 14 based on the stream management information and error management information temporarily stored in the memory 16. . Details of the error repair process will be described later.

  Next, details of each data file used in the present embodiment will be described with reference to FIGS.

  FIG. 2 is a schematic diagram showing the relationship between stream data, management information data, error management data, and a file group 50 in which each data is recorded in the present embodiment.

  In the present embodiment, a playlist file that will be described in detail below is used as error management data.

  Stream data DATA1 to DATA3 are recorded in the stream files S1 to S3, respectively.

  The stream management information files M1 to M3 include identifiers I1 to I3 for identifying the corresponding stream files S1 to S3, data IN1 to IN3 indicating a display time (PTS) for starting stream reproduction, and a display time (PTS for reproducing end). ), And GOP head position information of the stream data indicated by the packet number from the head of the file for smoothly reproducing the stream file, display time information (PTS) of the GOP head frame, The total number of packets, information on elementary streams included in the stream data, and other stream information are recorded.

  Note that the display time information IN1 to IN3 and the display time OUT1 to OUT3 at the end of the above-described stream reproduction are the single display time information at the start of reproduction and the display time information at the end of reproduction, as stream data is continuously recorded. However, when the stream data is recorded discontinuously, display start time display time information and display end time display data are required for each discontinuous area.

  In the playlist files (error management data) P1 to P3, management information file identifiers I1 to I3 for identifying the corresponding management information files M1 to M3 and error occurrence flags ERROR1 to ERROR3 are recorded. In this embodiment, I1 = M1, P2, ERROR1 = TRUE, I2 = M2, P1, ERROR2 = FALSE, I3 = M3, and ERROR3 = FALSE.

  In the file group 50 in which each data is recorded, P1, M1, and S1 form title 1, P2, M2, and S2 form title 2, and P3, M3, and S3 form title 3.

  Note that the title names TITLE1 to TITLE3 indicating a series of recording data (titles), the recording start times TIME1 to TIME3 of the series of recording data (titles), the total playback time SIZE1 to SIZE3 of the series of recording data (titles), Display time information (PTS) IN1 to IN3 at the start of stream reproduction, display time information (PTS) OUT1 to OUT3 at the end of reproduction, and other additional information may be recorded in the playlist file.

  The stream file S1 ', the stream management information file M1', and the playlist file P1 'are the data of S1, M1, and P1 that have been subjected to the error recovery process. The divided stream files S1 and S2 are management information file identifiers I1 = M1, P2 and error occurrence flag ERROR1 = TRUE recorded in the playlist file P1, and management information file identifiers I2 = M2 recorded in the playlist file P2. , P1, an error recovery process for associating the stream management information file M2 with the playlist P1 is performed, and the playlist P2 itself is deleted.

  Details of the error repair processing will be described later. The management information files M1 and M2 are associated with the playlist file P1 by the error repair process. The stream file S1, the stream management information file M1, and the playlist file P1 are updated to S1 ', M1', and P1 ', and the playlist file P2 is deleted.

  When the error repair process is completed, P1 ', M1', S1 ', M2, and S2 have the same title.

  Next, each processing performed in the present embodiment and the flow of the entire processing will be described with reference to FIGS.

  FIG. 3 is a schematic diagram showing a recording process when a recording error occurs in the present embodiment.

  Lower stream data d1 to d25 are stream data transferred to the buffer 12.

  It is assumed that the buffer 12 has a size sufficient to temporarily store eight data corresponding to the stream data d6 to d13.

  Stream data d1 to d15 indicated by solid lines indicate stream data actually transferred to the buffer 12 by time t3, and stream data d16 to d25 indicated by broken lines are stream data scheduled to be transferred to the buffer from now on. Indicates.

  The upper stream data e1 to e24 are stream data recorded on the recording medium 14.

  Stream data e1 to e12 and e14 indicated by solid lines indicate stream data actually recorded on the recording medium 14 until time t3, and stream data e15 to e24 indicated by dotted lines are now recorded on the recording medium. Indicates scheduled stream data.

  The stream data input from the data input unit 18 is temporarily stored in the buffer 12 and is recorded on the recording medium 12 when the stream data stored on the buffer 12 exceeds a predetermined amount.

  It is assumed that a recording error has occurred during the recording of the stream data e12 at time t1. At this time, the temporary recording of the stream data from the data input unit 18 to the buffer 12 is stopped and the transfer of the stream data from the buffer 12 to the recording medium 14 is temporarily stopped, and the stream data d13 is not transferred.

  In this embodiment, when a recording error occurs, error occurrence information is recorded in the memory 16 without performing a verify process or an error repair process, the error recovery process is completed in a short time, and the process returns to the recording process.

  When the error recovery process is completed at time t2, the temporary recording of data from the data input unit 18 to the buffer 12 is resumed. When the stream data d14 is temporarily recorded in the buffer 12, the stream data d14 is started from the buffer 12 as a starting point. The data transfer to the recording medium 14 is resumed, and the stream data e14 is recorded on the recording medium.

  Eventually, the stream data e11 to e12 that cannot be reproduced is deleted by the error recovery process performed after the series of stream data is transferred, and the stream data corresponding to the stream data d11 to d13 on the buffer 12 is lost.

  As described above, by ending the error recovery process in a short time, the time spent on the error recovery process is shortened and the loss of data is reduced.

  FIG. 4 is a flowchart showing the flow of recording processing in the present embodiment.

  First, when the recording process is started, the management information control unit 40 prepares to record management information in the memory 16 (S401). Specifically, a stream file is newly created on the recording medium 14, and file management information, stream management information, and error management information of the stream file are newly created on the memory 16.

  Next, the stream data input from the signal input unit 18 is analyzed by the stream analysis unit 22 and transferred to the buffer 12 (S402).

  Further, based on the stream analysis data analyzed by the stream analysis unit 22, the management information generation unit 42 creates stream management information, transfers it to the temporary recording area of the memory 16, and updates it (S403).

  Next, the buffer monitoring unit 24 monitors whether the stream data transferred to the buffer 12 has reached a predetermined amount (S404). If the predetermined amount has been reached, the stream data stored in the buffer 12 is recorded in the recording control unit. A predetermined amount is transferred to 205 (S405). If the stream data accumulated in the buffer 12 does not reach the predetermined amount, the process returns to S402 to continue the transfer of the stream data.

  The stream data transferred to the recording control unit 30 is recorded on the storage medium 14 by the data recording unit 34. At this time, occurrence of a recording error is monitored by the recording error detection unit 32 (S406), and if a recording error is detected, an error recovery process is performed (S410), and then the process returns to S402 to continue stream data transfer. To do.

  If no recording error has occurred, the management information generating unit 42 determines information on the amount of recording completed on the recording medium 14 from the stream management information and file management information stored in the work area of the memory 16, The data is transferred to a storage area different from the work area of the memory 16 (S407).

  Thereafter, it is determined whether or not the recording process is to be stopped (S408). If the recording process is to be stopped, a recording stop process is performed (S409), and the recording process is terminated. If the recording process is not stopped, the flow returns to S402 to continue the transfer of the stream data.

  Recording of each determined management information file to the recording medium 14 may be performed when the recording is stopped. However, when there is an instruction to eject the recording medium 14 or when the recording apparatus 10 is turned off. You may go in case.

  Next, an error recovery process procedure according to this embodiment will be described.

  FIG. 5 is a flowchart showing the flow of error recovery processing in this embodiment, which corresponds to S410 in FIG.

  When the recording error detector 32 detects a recording error, the error recovery process shown in FIG. 5 is started.

  An error detection signal is transmitted from the recording error detection unit 32 to the stream control unit 20 and the management information generation unit, and the stream control unit 20 stops the transfer of the stream data (S501).

  The data recording unit 34 performs processing for ending the stream file currently recorded on the recording medium 14. The management information generating unit 42 creates stream management information and file management information corresponding to the recorded stream file, and determines each management information (S502).

  After each management information is determined, it is recorded in the error management information that the finished old stream file and the newly created stream file are continuous data divided by an error (S503). Specifically, as shown in FIG. 2, the error occurrence flag in the corresponding playlist file which is error management information is set to TRUE, and the continuous stream management information is used as the error occurrence file identifier in the management information file identifier portion. Add an error management information identifier that points to.

  After the above processing, a playlist file which is an error management information file of a newly created stream file is newly created on the memory 16 and associated with the newly created stream file and stream management information (S504). .

  Thereafter, the recording pointer of the buffer 12 is moved to the head of the buffer 12 (S505), and the stream control unit 20 resumes the transfer of the stream data to the buffer 12 (S506). Stream data is recorded in a newly created stream file.

  Next, the procedure of the recording stop process in this embodiment will be described.

  FIG. 6 is a flowchart showing the flow of the recording stop process in this embodiment, which corresponds to S409 in FIG.

  When the recording stop process is started, the stream control unit 20 stops the transfer of the stream data to the buffer 12 (S601), transfers the stream data remaining in the buffer 12 to the recording control unit 30, and the recording control unit 30 Is recorded on the recording medium 14 (S602).

  The management information generator 42 updates the stream management information, error management information, and file management information corresponding to the title being recorded, and performs management information determination processing (S603). The determined management information is transferred onto the memory 16 by the management information control unit 40.

  The management information control unit 40 further refers to the error management information temporarily stored in the memory 16 and checks the error occurrence flag (S604). If there is no error management information of error occurrence flag = TRUE, the recording stop process ends as it is. If there is even one error management information of error occurrence flag = TRUE, a recording error repair process is performed (S605).

  FIG. 7 is a flowchart showing the flow of error repair processing in the present embodiment.

  When the error repair process is started, the error repair unit 44 determines an initial reproduction position of stream data to be repaired on the recording medium 14 through the recording control unit 30 (S701).

  The initial reproduction position is a data unit (for example, GOP) that is randomly accessible and has information necessary for decoding encoded data at a position before the error occurrence point.

  In addition, in the case of a recording medium in which writing is performed in units of data in the ECC block 71, the amount to be deleted in units of data in the ECC block 71 must be determined. The initial value is traced backwards in time series in the above units, and the process is checked retroactively until the reproducible initial position is determined (see FIG. 12).

  If the search returns to the beginning of the stream file for which error correction is performed by the time-series reverse search by the above method, there is no reproducible portion in the stream data, and the process proceeds to the title deletion process in S708. If the head has not yet returned to the beginning of the stream file, the error recovery unit 44 transfers a predetermined amount (for example, one block) of stream data from the return position from the recording medium 14 to the memory 16 (S703). It is determined whether the stream data is correct and reproducible data (S704).

  If it is not possible to reproduce the stream data from the returned position, the reproduction position is further traced back in time series reverse order (S707), and the process returns to S702 to S704. If the stream data is correct and reproducible, the stream data from the returned position to the end is deleted (S705).

  The stream management information corresponding to the stream data deleted in the above process is similarly deleted (S706). Here, the error repair process is confirmed, and the error occurrence flag of the error management information of the same title corresponding to the stream file subjected to the error repair process is changed to FALSE.

  Thereafter, the error management information is checked, and it is determined whether or not the repair work has been completed for all stream data for which the error occurrence flag is TRUE (S709). If there is still error management information with the error occurrence flag set to TRUE, the process proceeds to the next error management information (S711), returns to S701, and continues the repair processing of the corresponding stream file in the same manner.

  When the error occurrence flag of all error management information is FALSE, a process for combining continuous stream data and stream management information of the same title is performed on a playlist file having two or more management information file identifiers. (S710).

  Specifically, a series of stream data and stream management information identifiers are added to one error management information so that stream data and stream management information of the same title can be continuously played back, and error management information for the added amount Is deleted (see P1 ′ in FIG. 2).

  With the above procedure, the error repair process is completed.

  FIG. 8 is a schematic diagram showing how a stream file, a management information file, and a playlist file that is error management information are changed by error correction processing in the present embodiment.

  The stream file S1 starts recording at the time Tstart, an error occurs at a certain point, the error is detected at the time T1, and the recording of the stream data is stopped.

  The stream management information file M1 starts updating at the same time as the stream file S1 at time Tstart and continues to be updated until recording is stopped at time T1.

  The playlist file P1 is created simultaneously with the stream management information file M1, and the file name M1 of the stream management information is stored in the identifier I1 indicating the corresponding management information file.

  When an error occurs at time Terror, the error occurrence flag ERROR1 of the playlist file P1 is set to TRUE without performing error repair processing of the stream file S1 and the management information file M1. Further, in order to identify that the new stream file S2 is continuous data with the stream file S1, the identifier of the playlist file P2 is added to the management information file identifier I1.

  Thereafter, a new stream file S2, a new stream management information file M2, and a new playlist file P2 are created, and recording of the stream data is continued.

  Recording of the stream file S2 is resumed as a new file at time T2, and the recording ends at time Tend.

  The stream management information file M2 is updated again as a new file at the time T2 at the same time as the stream file S2, and is continuously updated until the recording is stopped at the time Tend.

  The playlist file P2 is created at the same time as the stream management information file M2, and the file name M2 of the stream management information and the file of the playlist file recorded before the error occurs in the identifier I2 indicating the corresponding management information file The name P1 is recorded, and FALSE is recorded in the error occurrence flag ERROR2.

  At time Tend, a series of recording ends, and stream management information data M1 and M2 corresponding to the stream files S1 and S2 are determined. At this time, the error repair processing of the stream file S1 and the stream management information file M1 in which the recording error has occurred has not been performed yet.

  The above is the recording contents of each file when recording stream data.

  Next, changes in each data when the recording error repair process is performed after the end of the recording of the stream data will be described.

  In the error recovery process, a playlist file whose error occurrence flag is TRUE is detected. It is determined that there is an error at the end of the stream file S1, and error recovery processing is performed. From the end of the stream file S1, the data is traced back in units of ECC blocks 71 until data that can be normally reproduced is reached.

  The data is deleted by a predetermined amount that can be normally reproduced (S1 '), and the stream management information data in the corresponding stream management information file M1 is updated (M1'). Further, the error occurrence flag ERROR1 of the playlist file P1 is updated to FALSE.

  Note that the predetermined amount to be deleted is desirably determined in ECC units based on GOP information. Further, the stream files S1 and S1 'and the stream management information files M1 and M1' are different from each other only in data contents, and indicate the same file.

  After the update to the stream file S1 ′ and the management information file M1 ′ is completed, the playlist file P2 is referenced from the file name recorded in the management information file identifier I1 of the playlist file P1, and the management information file identifier of the playlist P2 From I2, it is recognized that the stream file S1 and the stream file S2 are continuous stream data divided by an error. The management information file identifier I1 of the playlist file P1 is updated to M1 '+ M2 (P1'), and the playlist file P2 is deleted. By the above processing, it is possible to indicate that the stream data S1 'and S2 and the stream management information files M1' and M2 are the same title to be reproduced continuously only by the playlist file P1 '.

  In this embodiment, only error management data in which an error has occurred is associated with a management information file identifier for identifying that the error flag is set to TURE and identifying continuous data. In addition, the error flag may be set to TRUE in the error management data of both the file recorded when the error occurs and the file newly created after the error occurs. In this case, since no error has occurred in the last title of consecutive titles, it is not necessary to delete the error portion at the end of the file.

  In the present embodiment, the management information file identifier is associated with continuous data by additionally recording a playlist file name. However, the management information file identifier refers to continuous data with reference to the contents of the management information data and the title name. It may be identified that there is a certain title, that is, the same title.

  In this embodiment, the playlist file is used as the error management information file. However, the present invention is not limited to this, and an error table that records the title where the error occurred and the location where the error occurred is stored in the memory as an error management information file. You may create it.

  In the present embodiment, the stream data refers to a series of data transferred so that the video (moving image) flows without interruption, but may be audio-only data without video. It may be data including video and audio.

[Embodiment 2]
Next, another embodiment of the present invention will be described with reference to FIG. The stream data recording method of this embodiment is different from the stream data recording method shown in FIG. 3 in the stream data to be recorded in a new file, and the other configurations are the same. In addition, the same code | symbol is attached | subjected to the structure which has the function similar to the structure demonstrated in the said embodiment, and the description is abbreviate | omitted.

  FIG. 9 is a schematic diagram illustrating a recording process when a recording error occurs in the present embodiment.

  Lower stream data d1 to d25 are stream data transferred to the buffer 12.

  The buffer 12 has a size sufficient to temporarily store eight data corresponding to the stream data d7 to d14.

  Stream data d1 to d14 indicated by solid lines indicate stream data actually transferred to the buffer 12, and stream data d16 to d25 indicated by dotted lines indicate stream data to be transferred from now on.

  The upper stream data e <b> 1 to e <b> 22 is stream data recorded on the recording medium 14.

  Stream data e1 to e12 indicated by solid lines indicate stream data actually recorded on the recording medium 14, and stream data e12 to e22 indicated by dotted lines indicate stream data to be recorded from now on.

  It is assumed that a recording error has occurred during the recording of the stream data e12 at time t1. At this time, the transfer of the stream data from the buffer 12 to the recording medium 14 is temporarily stopped, and the stream data d13 is not transferred. Here, the temporary recording of the stream data from the data input unit 18 to the buffer 12 is continued without stopping.

  In this embodiment, when a recording error occurs, error occurrence information is recorded in the memory 16 without performing a verify process or an error repair process, the error recovery process is completed in a short time, and the process returns to the recording process.

  At time t1, the error recovery process is completed in a short time, and the process of recording the stream data on the recording medium 14 as a new stream file is resumed. At that time, the stream data corresponding to the stream data e11 before the stream data e12 in which the error has occurred is transferred from the buffer 12 to the recording medium 14.

  In the example shown in the figure, when creating a new stream file, the stream data d11 corresponding to e11 remaining on the buffer 12 is transferred to the recording medium 14 with the stream data d11 at the head, d12, d13. As a result, the stream data corresponding to the stream data that is lost due to the occurrence of a recording error, which is lost in the recording error repair process, is retransmitted to the recording medium 14 in the stream data. Data can be reduced, and ideally, lost data can be set to zero.

  The stream data to be retransmitted is not limited to the previous block, and may be retransmitted from the previous stream data as long as the buffer size allows.

  In addition, when using the data recording method shown in the above embodiment, in order to avoid duplication of data between the stream file in which an error has occurred and the newly created stream file, the block information of the stream data recorded by retransmission is error management information. It is desirable to record in (playlist file) or the like. By referring to the information and performing error repair processing, a stream file in which duplicate data does not exist can be realized by error repair.

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

  For example, each unit and each processing step of the data recording apparatus according to the above embodiment is such that a calculation unit such as a CPU executes a program stored in a storage unit such as a ROM (Read Only Memory) or a RAM, and an input unit such as a keyboard. It can be realized by controlling output means such as a display or communication means such as an interface circuit. Therefore, the computer having these means can realize various functions and various processes of the data recording apparatus simply by reading the recording medium storing the program and executing the program. In addition, by recording the program on a removable recording medium, the various functions and various processes described above can be realized on an arbitrary computer.

  As the recording medium, a program medium such as a memory (not shown) such as a ROM may be used for processing by the microcomputer, and a program reading device is provided as an external storage device (not shown). It may be a program medium that can be read by inserting a recording medium there.

  In any case, the stored program is preferably configured to be accessed and executed by the microprocessor. Furthermore, it is preferable that the program is read out, and the read program is downloaded to a program storage area of the microcomputer and the program is executed. It is assumed that this download program is stored in advance in the main unit.

  The program medium is a recording medium configured to be separable from the main body, such as a tape system such as a magnetic tape or a cassette tape, a magnetic disk such as a flexible disk or a hard disk, or a disk such as a CD / MO / MD / DVD. Fixed disk, IC card (including memory card), etc., or semiconductor ROM such as mask ROM, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), flash ROM, etc. In particular, there are recording media that carry programs.

  In addition, if the system configuration is capable of connecting to a communication network including the Internet, the recording medium is preferably a recording medium that fluidly carries the program so as to download the program from the communication network.

  Further, when the program is downloaded from the communication network as described above, it is preferable that the download program is stored in the main device in advance or installed from another recording medium.

  The storage device of the present invention can reduce stream data lost due to a recording error, reduce processing time when performing error repair processing, speed up recovery processing when a recording error occurs, speed up repair processing, and recording medium Can be applied to recording devices that use magnetic disks such as hard disks and media such as CD / MO / MD / DVD as recording media. it can.

1, showing an embodiment of the present invention, is a block diagram showing a schematic configuration of each part of a data recording apparatus. FIG. FIG. 3 is a schematic diagram illustrating a relationship between stream data, management information data, error management data, and a file in which each data is recorded in the data recording apparatus according to an embodiment of the present invention. FIG. 5 is a schematic diagram illustrating a recording process when a recording error occurs according to an embodiment of the present invention. FIG. 5 is a flowchart illustrating a flow of recording processing according to an embodiment of the present invention. FIG. 5 is a flowchart illustrating an error recovery process according to an embodiment of the present invention. FIG. 5 is a flowchart illustrating a flow of recording stop processing according to an embodiment of the present invention. FIG. 5 is a flowchart illustrating an error repair process according to an embodiment of the present invention. FIG. 4 is a schematic diagram illustrating an embodiment of the present invention and changes in error management processing of each management information of a stream file, a management information file, and a playlist file that is error management information in the data recording apparatus. FIG. 10 is a schematic diagram showing a recording process when a recording error occurs, showing another embodiment of the present invention. It is a schematic diagram showing the occurrence of a recording error in a data recording apparatus according to the prior art. It is a conceptual diagram which shows the prior art and shows the data recorded on recording media, such as an optical disk. It is a conceptual diagram which shows a prior art and shows the correspondence of GOP and ECC recorded on the recording medium.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Data recording device 12 Buffer 14 Recording medium 16 Memory 18 Data input part 20 Stream control part 22 Stream analysis part 24 Buffer monitoring part 30 Recording control part 32 Recording error detection part 34 Data recording part 40 Management information control part 42 Management information generation part 44 Error repair section

Claims (13)

In a data recording apparatus for recording stream data as a stream file on a randomly accessible recording medium,
A data recording apparatus comprising: a data recording unit that records the stream data as a new file on the recording medium and continues recording when a recording error occurs. A buffer for buffering the stream data before recording the stream data on the recording medium;
When a recording error occurs, the data recording unit starts from a portion of the stream data buffered in the buffer, which has been recorded on the recording medium before the recording error occurs, as a new file. The data recording apparatus according to claim 1, wherein the data recording apparatus records on a recording medium. A management information generating unit that generates stream management information including stream information necessary for stream data reproduction control by analyzing the stream data;
A memory for temporarily storing management information including the stream management information;
The data recording unit further records the management information in the memory on the recording medium after the time point when the recording of the input stream data to the recording medium is completed. The data recording device described. The management information generation unit further generates error management information indicating a recording error occurrence state when a recording error occurs,
4. The data recording apparatus according to claim 3, wherein the management information includes the error management information.   5. The data recording apparatus according to claim 4, wherein the error management information includes an identifier for identifying a stream file recorded when a recording error occurs.   5. The data recording apparatus according to claim 4, wherein the error management information includes an identifier for identifying two stream files recorded before and after a recording error occurs.   5. The data recording apparatus according to claim 4, wherein the error management information includes an error occurrence position in the stream data recorded when a recording error occurs. After the recording of the input stream data to the recording medium is completed, the stream data in which the recording error has occurred on the recording medium is repaired with reference to the error management information, and the corresponding management information on the memory A recording error repairing unit for updating
The said data recording part records the said management information which performed the repair process on the said memory on the said recording medium, when all the correction processes of a recording error are completed, The any one of Claims 1-7 characterized by the above-mentioned. The data recording device according to item.   The recording data repairing unit, when all the recording error repairing processes are completed, sets two stream files recorded before and after the recording error to be a series of files that are continuously played back. The data recording apparatus according to claim 1, wherein the data recording apparatus is a data recording apparatus. A control method of a data recording apparatus for recording stream data as a stream file on a randomly accessible recording medium,
A method for controlling a data recording apparatus, comprising: a step of recording the stream data as a new file on the recording medium and continuing the recording when a recording error occurs. The data recording device further includes a memory for temporarily storing management information,
Analyzing the stream data to generate stream management information including stream information necessary for reproduction control of the stream data, and temporarily storing it in a memory as part of the management information;
11. The data recording apparatus according to claim 10, further comprising a step of recording the management information on the memory on the recording medium after the time point when the recording of the input stream data on the recording medium is completed. Control method.   A data recording device control program for operating the data recording device according to any one of claims 1 to 9, wherein the data recording device control program causes a computer to function as each unit.   A computer-readable recording medium on which the data recording device control program according to claim 12 is recorded.

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