JP2003109360A - Method and device for recording and reproducing video - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a device by realizing stable video recording processing even though service interruption occurs during video recording. SOLUTION: Audio video information encoded and formatted by an encoder part 50 is recorded on a disk 1001 or a hard disk through a data processor 1003. At this time, at least time map information as management information for managing data reproduction is periodically recorded as backup in a prescribed area of the hard disk from a buffer memory 52, and when restored after service interruption, the backed up time map information is utilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video recording / reproducing method and device. In addition, it is a device that records and reproduces information based on the DVD standard using a digital versatile disc (DVD) as a recording medium, and is characterized by stable recording even when a power failure occurs during recording. Be prepared.

[0002]

2. Description of the Related Art At present, a video tape recorder (VTR) is most popular as a video recording / reproducing apparatus. However, in recent years, the technology of digital versatile disc (DVD) has advanced, and a device for recording video information on a DVD-RAM or DVD-RW has been developed.

A device for recording on DVD-RAM or DVD-RW is D
Video recording (Video Reco
The input data is converted into a format conforming to the rding standard (hereinafter referred to as VR standard) and the recording process is performed.

The recording process according to the VR standard has the following features, if only a necessary part is briefly described.

(1) A universal disc format (UDF) Ver. 2.0 compliant file system is constructed on a recording medium.

(2) The video signal (moving image) is compressed in the MPEG2 format and saved in the file "/DVD_RTAV/VR_MOVIE.VRO".

(3) The management information for retrieving the previous video signal is stored in the file "/DVD_RTAV/VR_MANGR.IFO".

Therefore, in the video recording / reproducing apparatus for recording on the DVD-RAM or DVD-RW, the above-mentioned three points must be satisfied.

In order to create the video signal described in (2),
Such a video recording / reproducing apparatus is equipped with an MPEG2 Encoder, and the MPEG2 Stream generated by this Encoder is VR_M.
Saved in the OVIE.VRO file. Further, since only one file exists on one recording medium, even if recording is performed a plurality of times, all MPEG data will be added to the same file. Information necessary for searching which program is recorded at which position among these files is recorded in the management information file described in (3).

The information described in the management information file (VR_MANGR.IFO) is the number of programs recorded in this recording medium, and each program is VR_MOVIE.V.
It indicates from which position in the RO file it is recorded. Also, in order to facilitate searching within one program, the position of each 600 fields from the beginning of the program is recorded as one group of picture (1GO
Information such as size and playback time for each P) (hereinafter referred to as TMAP information) is also stored. This TMAP information is MPEG2 Enc
It is generated when the oder performs the encoding process, and is temporarily stored in the memory of the video recording / playback device, and VR_M
Writing to the ANGR.IFO file.

[0011]

However, in the above-mentioned conventional technique, the time map (TMAP) information is temporarily stored in the memory, and if a power failure occurs during recording, the TMAP information will be lost. You will be destroyed. If this information is lost, video grading (V
R) Since it will not be established as a standard, the recording information until the power failure will have to be discarded. To prevent this, SRAM
It is conceivable to store this information in a place such as the one and prepare for a power failure. However, it was necessary to provide expensive parts called SRAM, which was a barrier to cost reduction.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a video recording apparatus and method capable of realizing stable recording processing and improving the reliability of the apparatus even if a power failure occurs during recording.

[0013]

To achieve the above object, the present invention stores TMAP information generated from an encoder (Encoder) as a separate file in the HDD during recording in the DVD-RAM or HDD. Thus, a method and apparatus for restoring recording information at the time of power failure without providing expensive parts such as static memory (SRAM).

[0014]

DETAILED DESCRIPTION OF THE INVENTION The present embodiment will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a recording / reproducing apparatus to which the present invention is applied. When each block in FIG. 1 is roughly divided, the left side shows the main blocks of the recording section, and the right side shows the main blocks of the reproducing section.

This recording / reproducing apparatus has a disk drive unit 1002 for rotationally driving an optical disk 1001 as a first medium which is an information storage medium capable of constructing a video file and reading / writing information. It also has a hard disk drive unit 2001 that drives a hard disk as a second medium. The data processor unit 1003 can supply recording data to the disk drive unit 1002 and the hard disk drive unit 2001, and can also receive a reproduced signal.

The disk drive unit 1002 has a rotation control system for the optical disk 1001, a laser drive system, an optical system, and the like. The data processor unit 1003 handles data in recording or reproduction units, and includes a buffer circuit, a modulation / demodulation circuit, an error correction unit, and the like.

The recording / reproducing apparatus also has an encoder section 50 constituting the recording side and a decoder section 60 constituting the reproducing side.
A microcomputer block 30 for controlling the operation of the apparatus main body is a main component.

The encoder section 50 has an analog-digital converter for video and audio that digitizes the input analog video signal and the input analog audio signal, a video encoder, and an audio encoder. The output of the encoder unit 50 is output to a predetermined DVD-VR by a formatter 51 including a buffer memory.
It is converted and stored in the following format.

An external analog video signal and an external analog audio signal from the AV input section 41 or an analog video signal and an analog audio signal from the TV tuner 42 are input to the encoder section 50. In the video encoder, the digital video signal is converted into a digital video signal compressed at a variable bit rate based on the MPEG2 or MPEG1 standard. Digital audio signal is MP
It is converted to a digital audio signal compressed at a fixed bit rate based on the EG or AC-3 standard, or a linear PCM digital audio signal.

The encoded digital video signal and digital audio signal are packed by the formatter 51 into a video pack and an audio pack,
In addition, these are aggregated to form a DVD-VR standard (for example, DVD-RA
M, DVD-RW, etc.). Here, the present apparatus uses information formatted by the formatter 51 (pack of video, audio, etc.)
And the created management information to the data processor 1003.
The data can be supplied to the hard disk drive section 2001 (or the disk drive section 1002) via the HDD and recorded on the hard disk (or the optical disk 1001). Also a hard disk (or optical disc 1001)
The information recorded on the optical disc 1001 is transmitted via the data processor unit 1003 and the disc drive unit 1002.
(Or it can be recorded on a hard disk). This is because the data formats of the information recorded on the hard disk and the optical disk 1001 are the same.

The macro computer block 30 is an MPU.
It includes a (micro processing unit) or a CPU (central processing unit), a ROM in which a control program and the like are written, and a RAM for providing a work area necessary for executing the program. The MPU of the microcomputer block 30 executes defect location detection, unrecorded area detection, recording information recording position setting, UDF recording, AV address setting, etc. using RAM as a work area according to the control program stored in the ROM. To do. The microcomputer block 30 has an information processing unit necessary for controlling the entire system.
M, directory detector, VMG (whole video management information)
It is equipped with an information creation unit.

Of the execution results of the MPU, the contents to be notified to the user are displayed on the display unit 43 of the DVD video recorder or OSD (on-screen display) on the monitor display. Further, the microcomputer block 30 has a key input section 44 for giving an operation signal for operating this apparatus. It should be noted that the microcomputer block 30 includes the disk drive unit 10
02, data processor unit 1003, encoder unit 50
The timing for controlling the decoder unit 60 and / or the like can be executed based on the time data from the system time clock (STC) 38. The recording and reproduction operations are normally executed in synchronization with the time clock from the STC 38, but other processing may be executed at a timing independent of the STC 38.

The decoder unit 60 is a DVD having a pack structure.
A separator that separates and extracts each pack from the format signal, a memory used when performing pack separation and other signal processing, and a V decoder that decodes the main video data (contents of the video pack) separated by the separator,
It has an A decoder that decodes the audio data (contents of the audio pack) separated by the separator. The output video signal of the decoder unit 60 is input to the video mixing unit 71. The video mixing unit 71 synthesizes text data. The video mixing unit 71 is also connected to a line that directly takes in signals from the TV tuner 41 and the A / V input unit 42. A frame memory 72 used as a buffer is connected to the video mixing unit 71. If the output of the video mixing unit 71 is a digital output, the interface (I / F) 73
Is output to the outside via the digital analog converter 74 in the case of analog output. The output audio signal of the decoder unit 60 is analog-converted by the digital-analog converter 77 via the selector 76 and output to the outside. The selector 76 is controlled by a select signal from the microcomputer block 30. As a result, the selector 76 causes the TV tuner 41 and the A /
When directly monitoring the digital signal from the V input section 42, it is also possible to directly select the signal that has passed through the encoder section 50.

The formatter of the encoder unit 50 creates time map (TMAP) information during recording and sends it to the MPU of the microcomputer block 30 periodically (G
Information such as when the OP first interrupt). VOBU as TMAP information
VOBU entry information (VOBU entry information that describes the number of packs of the VOBU, the end address of the I picture from the beginning of the VOBU, and the playback time of the VOBU
BU_ENT), the number of packs from the start of recording for each 600 fields, and VOBU_ corresponding to the position for each 600 fields
The encoder unit 50 outputs time entry information (TM_ENT) in which information on how many fields the ENT number and the position of the 600th field are displaced from the corresponding VOBU_ENT head is described.

The data processor section 1003 receives data in VOBU units from the formatter of the encoder section 50 and supplies it to the disk drive section 1002. Further, the MPU of the microcomputer block 30 creates management information necessary for reproducing the recorded data, and when it recognizes the data recording end command, sends the created management information to the data processing unit 1003. As a result, the management information is recorded on the disc. Therefore, when the encoding is being performed, the MPU of the microcomputer block 30 receives the TMAP information from the encoder unit 50 and stores it in the work memory.

Here, the relationship between the management information of the DVD-VR standard and the video object which is the content will be briefly described.

In FIG. 2, the video object (VOB) will be described first. VOB is VR_M as a file
Recorded in the OVIE.VRO file. Video files have a hierarchical structure. One file is composed of one or more VOBs (video objects), one VOB is composed of one or more VOBUs (video object units), and one VOBU is , Composed of multiple packs. Multiple packs include RDI pack, V (video) pack, A
There are (audio) packs and the like. Sub-picture pack (SP
Pack) may exist.

The RDI pack is called a real-time data information pack. This pack includes information indicating the start time at which the first field of the VOBU to which it belongs is reproduced, information indicating the recording time of the VOBU, manufacturer information (MNFI), and the like. It also includes display control information (DCI) and copy control information (CCI). The display control information indicates aspect ratio information, subtitle mode information, and film camera mode information. The copy control information (CCI) includes either copy permission information (0,0) or copy prohibition information (1,1).

The V pack is video data compressed by the MPEG2 system and is composed of a pack header, a packet header, and a video data section. The A pack is obtained by processing audio data by a method such as linear PCM, MPEG, or AC3, and includes a pack header, a packet header, and an audio data section.

The management information is called a video manager (VMG), in which video object information (VOBI), which is information about a video object (VOB) to be played back, is defined. Of the video object information (VOBI), information related to moving images is called movie video object information (M_VOBI). TMAP information generated by the formatter 51 is described in M_VOBI. This TMAP is information that specifies the VOBUs that make up the VOB corresponding to M_VOBI (VOBU_ENT information) and the VOB.
Since it is used for internal seek, it is composed of index information (TM_ENT information) generated every 600 fields.

As described above, when the MPU of the microcomputer block 30 receives the recording stop request from the user, it creates management information using the TMAP information stored in the work memory and stores it in the disk.

Therefore, if power is not supplied to the recording / reproducing apparatus due to a power failure or the like before the recording is stopped, the TMAP in the work memory is updated before the management information on the disk is updated.
Information will be lost.

According to the present invention, the TMAP information is stored in the work memory and at the same time stored in the prepared area of the hard disk so that even if a power failure occurs, the TM
The AP information is read from the hard disk and the management information is restored.

FIG. 3 shows the data structure inside the hard disk of the device of the present invention. The UDF area for the file system is described at the beginning of the hard disk. With this recording / playback device, after the DVD-RAM power failure countermeasure file area and the HDD power failure countermeasure file area are secured immediately after the UDF area when the hard disk is formatted, the VR format management information file (VR_MANGR.IF
O) area, video object file (VR_MOVIE.VR
O) Reserve the area. By securing the power failure countermeasure file area for each drive on the hard disk in advance, the power failure countermeasure data is always stored at the same address in the hard disk. The reason why both the power failure countermeasure files for DVD-RAM and hard disk are secured on the hard disk is that in the case of DVD-RAM, due to performance limitations, it is possible to write to the power failure countermeasure file at the same time during MPEG stream recording. This is because it is impossible to collapse. On the other hand, in the case of a hard disk, since the access speed is high, it is possible to write to the power failure countermeasure file while the MPEG stream is being written to the hard disk.

FIG. 4 shows in a flow chart the operation when the device of the invention is used for recording. In this figure, the recording on the DVD-RAM (optical disc 1001) is shown, but the recording operation on the hard disk can also be shown by a similar flowchart. DVD-RA
When recording on M is started, the video information and audio information encoded by the encoder unit 50 are formatted by the formatter 51, and the data processor unit 10
03, recording is performed via the disc drive 1002 (steps A1, A2, A3). In addition, TMAP information based on the DVD-VR standard is passed from the encoder unit 50 to the MPU and temporarily stored in the buffer memory 52 (step A
4). Here, if one minute or more has passed since the start of recording or the time when the TMAP information was written in the power failure countermeasure file in the hard disk last time, it is stored in the buffer memory 52.
Write the TMAP information to the power failure countermeasure file on the hard disk (steps A5 and A6).

When there is a recording stop request from the user, management information including TMAP information of the buffer memory 51 is created,
Writing to the VR_MANGR.IFO file on the hard disk, clearing the contents of the power failure countermeasure file, and then ending the recording (steps A7, A8, A9, A10, A11).

FIG. 5 shows the contents of the power failure countermeasure file stored in the hard disk. For the power failure countermeasure file, a fixed size area is secured in advance when formatting the hard disk. The recording / reproducing apparatus saves the data determined as shown in FIG. 5 at a determined position, for example, every minute during recording. Information about M_VOBI currently being recorded is recorded at the beginning of the power failure countermeasure file. Specifically, the recording start time, video attributes such as MPEG compression format and aspect ratio, audio attributes such as audio coding mode and the number of audio channels, and the number of TM_ENTs and VOBU_ENTs up to the present time are included. The TM_ENT and VOBU_ENT information currently stored in the buffer memory 51 is recorded in the next part of the power failure countermeasure file, respectively.

Even if a power failure occurs during recording, the power failure countermeasure file always exists in a fixed position on the hard disk. Therefore, by searching this file,
M_VOBI information, TM_ENT information of the program recorded before the power failure,
It is possible to restore the VOBU_ENT information to the state just before the power failure. In addition, when recording is completed normally,
The contents of the power failure countermeasure file are cleared as shown in step A10 of the flowchart. As a result, if the contents of this file are not cleared, it is possible to detect that a power failure has occurred during recording.

In a real-time recording / reproducing apparatus using a DVD, a point to be noted is that at least a minimum of continuous data access is required for continuous access during data access (seek). Sectors are needed. This unit is called CDA (Contiguous
Data area). In other words, it is a data size that is agreed in advance to realize seamless reproduction.

It is advantageous that this CDA is in units of ECC (error correction code) blocks. Therefore, the CDA size is set to a multiple of 16 sectors, and the file system records in this CDA unit.

FIG. 6 is a flow chart showing the operation when the recording / reproducing apparatus is powered on again after a power failure occurs during recording. When the power is turned on, the recording / reproducing apparatus reads the management information file from the disc and loads the already recorded information (step B
1, B2). If a power failure occurs during recording, a new management information file has not been written, so the state before the last recording is loaded. Next, the power failure countermeasure file in the hard disk is read and it is checked whether or not this file has been cleared (steps B3 and B4). If this file is not cleared, it means that a power failure occurred during recording. At this time, based on the information described in the power failure countermeasure file, create M_VOBI, restore TMAP information such as TM_ENT and VOBU_ENT, and recreate management information,
Save to VR_MANGR.IFO file. After that, the power failure countermeasure file is no longer needed, so clear the contents (step
B6, B7, B8, B9). As a result, even if a power failure occurs during recording, the information recorded before the power failure can be restored.

Returning to FIG. 1, description will be made. The operation shown in the above flowchart is performed by the microcomputer block 30.
Is executed by the power failure countermeasure processing unit that functions by software. Here, the power failure is detected when the power of the apparatus itself is turned off even in the recording mode. for that reason,
Information from the power supply detection unit 34 is supplied to the microcomputer block 30.

The image on the first or second recording medium (hard disk, RAM-disk) is not recorded during the power failure period. Therefore, when the recorded video is reproduced, the video before the power failure and the video after the power failure are connected. In this case, the user may misunderstand that the device malfunctions because the image content jumps. Therefore, in this system, in order to prevent misidentification by the user, display data indicating that there is a power failure or a temporary interruption of input is multiplexed and recorded in the video information recorded in the initial period after the power failure recovery. It is also possible. As the display data, for example, the data from the power failure recovery display text memory 35 is read and used. Even if the display content of the power failure recovery display text is different depending on whether it is determined to be "power failure" when synchronization detection is not obtained and when it is determined to be "power failure" when the power is turned off. Good.

[0045]

As described above, according to the present invention,
Even if there is a power outage during recording, we realize stable recording processing,
The reliability of the device can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall block of a recording / playback apparatus to which the present invention is applied.

FIG. 2 is a diagram shown for explaining management information and management units and data of video objects in the DVD-VR standard.

FIG. 3 is a diagram shown for explaining a file structure in a hard disk of the recording / reproducing apparatus according to the present invention.

FIG. 4 is a flowchart shown to explain an operation example of the recording / reproducing apparatus according to the present invention during recording.

FIG. 5 is a diagram shown for explaining information inside a power failure countermeasure file of the device according to the present invention.

FIG. 6 is a flowchart shown to explain an operation example when the device according to the present invention returns to power again after a power failure.

[Explanation of symbols]

30 ... Microcomputer block, 41 ... A / V input section, 42 ... TV tuner, 43 ... Display section, 44 ... Key input section, 50 ... Encoder section, 60 ... Decoder section, 71 ... Video mixer, 72 ... Frame memory, 73 ... Interface, 74, 77 ... Digital-analog converter, 76
... selector, 1001 ... optical disk, 1002 ... disk drive section, 1003 ... data processor section, 200
1 ... Hard disk device.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/765 H04N 5/781 510M 5/781 F term (reference) 5D044 BC01 BC04 CC04 DE23 DE48 EF05 FG18 HH17 5D077 AA02 AA23 CA20 DC40 DD01 DE02 EA33 EA34 5D090 AA01 BB04 CC01 CC04 FF09 FF29 HH01 JJ02 5D110 AA13 AA14 BB01 DA01 DA06 DA18 DB10 DB11 DC22 DC26 DD13

Claims (8)

[Claims] 1. At least two or more kinds of information of video information and management information for performing at least reproduction control of the video information are recorded on at least one recording medium by using the video information creating means. In the video recording / reproducing apparatus, the video information created by the video information creating means is written in the recording medium, and the management information is written in a predetermined position of the recording medium at a constant cycle, and a power failure occurs during recording. After the power is turned on, the predetermined position of the recording medium is searched, the management information described therein is read, and restored as the management information up to immediately before the power failure. . 2. Using at least two types of information, that is, video information and management information for controlling reproduction of the video information, by using video information creating means for accessing a plurality of recording media by time sharing. In a video recording / reproducing apparatus that records on one or more of a plurality of recording media, one recording medium cannot write the management information during recording of the video information due to the performance limitation, and the other recording medium has a performance limitation. If it is possible to write both information to the one recording medium, during the recording process for the one recording medium, or during the recording process for the other recording medium, the management information in a predetermined cycle of the other recording medium. The position of the other recording medium is searched for at the time of energization after a power failure during recording, and A video recording / reproducing method, characterized in that the management information is read and restored as management information immediately before the power failure. 3. The encoded video information is sequentially recorded on a first or second recording medium for each predetermined recording unit, and management information for reproducing the recorded video information is created and stored in a memory, In a video recording / reproducing apparatus for recording the management information created in the memory on the recording medium at the end of the recording operation, the management information stored in the memory is updated in a backup area of the first recording medium in a predetermined time unit. When recording, and when there is a power failure during the recording operation and then recovers, restore the backup management information recorded in the backup area to the memory, and create new management information following this restored backup management information. , The video information after power failure recovery
Alternatively, the video recording / reproducing method is characterized in that recording is performed on a second recording medium. 4. The video recording / reproducing according to claim 3, wherein the video information recorded in the initial period after the recovery from the power failure is multiplexed with display data indicating that the power failure has occurred. Method. 5. The video recording / reproducing method according to claim 3, wherein the first recording medium is a hard disk. 6. The video recording / reproducing method according to claim 3, wherein the power failure is determined by checking the power-off of the device. 7. The video recording / reproducing method according to claim 4, wherein the power failure is determined by checking that the presence or absence of a synchronizing signal of an input signal continues for a predetermined period. 8. The encoded video information is sequentially recorded in a predetermined recording unit on a first or second recording medium, and management information for reproducing the recorded video information is created and stored in a memory, In a video recording / reproducing apparatus for recording the management information created in the memory on the recording medium at the end of the recording operation, the management information stored in the memory is updated in a backup area of the first recording medium in a predetermined time unit. A means for recording, a means for restoring the backup management information recorded in the backup area to the memory when a power failure occurs during the recording operation and the power is restored after that, and new management information following the restored backup management information And a means for recording the video information after power failure recovery on the first or second recording medium. And a video recording / playback device.