JP2001076428A - Data recording/reproducing device and data recording/ reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the high speed processing time by reducing the process in the data decoding means at the time of reproduction. SOLUTION: The data recording/reproducing device 1 is provided with a recording part 2, reproducing part 3, HD 4, and controller 6. The recording part 2 is furnished with video/audio/auxiliary data encoders 14-16 for encoding by an MPEG-2 system and a header data memory 20. The reproducing part 3 is furnished with video/audio/auxiliary data decoders 36-38 and a header data memory 35. The controller 6 acquires the header information included in the MPEG data encoded by the encoders to record the acquired header information to the recording medium together with the MPEG data. Then, the reproduction control of the MPEG data is carried out based on the header information separately recorded with respect to the MPEG data at the time of reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus and a data recording / reproducing method for recording and reproducing audio data and video data on a recording medium which can be accessed randomly.

[0002]

2. Description of the Related Art In recent years, with the increase in capacity and cost of hard disks and the like, video data and audio data have been replaced with recording media such as hard disks capable of random access in place of conventional VTRs (video tape recorders). Recording systems are becoming widely used. By recording video data and audio data on such a randomly accessible recording medium, for example, simultaneous recording, simultaneous reproduction, simultaneous recording and reproduction of a plurality of video data and the like are also possible.

FIG. 9 shows a conventional data recording / reproducing apparatus using a hard disk.

[0004] A data recording / reproducing apparatus 100 shown in FIG.
This is a device called a so-called AV server which compresses video data and audio data and stores them on a hard disk.

[0005] The data recording / reproducing apparatus 100 includes a recording unit 10
1, a reproducing unit 102, a hard disk drive 103 for storing video data and the like, a recording unit 101, a bus 104 for data transmission between the reproducing unit 102 and the hard disk drive 103, a recording unit 101 and a reproducing unit 10
2 and a controller 105 for controlling the hard disk drive 103.

[0006] The data recording / reproducing apparatus 100 is supplied with auxiliary data in which auxiliary data of video data and audio data, and auxiliary information of input video data and audio data are described.
The input video data and the like are subjected to encoding processing and recording processing by the recording unit 101, and the hard disk drive 1
03 is stored. The data recording / reproducing device 10
0 reads out compressed video data and the like recorded on the hard disk drive 103, and the playback unit 102 performs decoding and playback processing of the video data and the like, and outputs baseband video data and the like. Controller 105
Issues operation commands and the like, manages the processing timing of the recording unit 101 and the reproducing unit 102, the data transfer timing of the bus 104, the recording and reproducing timing of the hard disk drive 103, and controls the operation of each unit.

The recording section 101 has a video data input terminal 1
11, an audio data input terminal 112, an auxiliary data input terminal 113, a video encoder 114, an audio encoder 115, and an auxiliary data input processing unit 11
6, a video data memory 117, an audio data memory 118, an auxiliary data memory 119, and a recording interface 120.

The video data input terminal 111 receives baseband video data. The baseband video data is supplied to the video encoder 114.

An audio data input terminal 112 receives baseband audio data. The baseband audio data is supplied to the audio encoder 115.

Auxiliary data is input to auxiliary data input terminal 113. This auxiliary data is supplied to the auxiliary data input processing unit 116.

The video encoder 114 compresses the supplied baseband video data in accordance with the MPEG-2 system. The image-compressed video elementary data is supplied to the video data memory 117 in GOP units in accordance with a memory write command from the controller 105. Here, one GOP is a unit of image processing defined by MPEG-2, and generally consists of 15 frames in NTSC.

The audio encoder 115 compresses the supplied baseband audio data according to the MPEG-2 system. In accordance with a memory write command from the controller 105, the audio-compressed audio elementary data is stored in a processing unit of 1G of the video data.
The data is supplied to the audio data memory 118 in a data unit corresponding to the OP.

The auxiliary data input processing unit 116 performs a conversion process for converting the supplied auxiliary data into data of a format matching the MPEG data stream. The converted auxiliary data is supplied to the auxiliary data memory 119 in a data unit corresponding to one GOP as a processing unit of the video data in accordance with a memory write command from the controller 105.

The video data memory 117 stores the supplied video elementary data in units of 1 GOP.
The video data memory 117 supplies the stored video elementary data to the recording-side interface 120 in GOP units according to a memory read command from the controller 105.

The audio data memory 118 stores the supplied audio elementary data in units of one GOP. The audio data memory 118 supplies the stored audio elementary data to the recording interface 120 in GOP units according to a memory read command from the controller 105.

The auxiliary data memory 119 stores the supplied auxiliary data in units of one GOP. The auxiliary data memory 119 supplies the stored auxiliary data to the recording-side interface 120 in GOP units according to a memory read command from the controller 105.

The recording-side interface 120 transfers the video elementary data, audio elementary data and auxiliary data for one GOP supplied from the video data memory 117, the audio data memory 118 and the auxiliary data memory 119 to a bus such as a PCI format. 10
The data is converted into a data format according to the transfer protocol 4 and transferred to the hard disk drive 103 via the bus 104.

The hard disk drive 103 records the transferred video elementary data, audio elementary data, and auxiliary data in units of 1 GOP according to a recording command from the controller 105.

The reproducing unit 102 includes a reproducing interface 121, a video data memory 122, an audio data memory 123, an auxiliary data memory 124, a video decoder 125, an audio decoder 126, an auxiliary data output processing unit 127, Video output terminal 128
, An audio output terminal 129, and an auxiliary data output terminal 130.

Video elementary data and the like from the hard disk drive 103 reproduced according to a reproduction command from the controller 105 are transferred to the reproduction side interface 121 via the bus 104. The data to be transferred are video elementary data, audio elementary data, and auxiliary data in a data format according to a transfer protocol of the bus 104 such as a PCI format, and are transferred in units of 1 GOP. After converting the data format of the transferred data, the reproduction-side interface 121 separates the data into three streams of video elementary data, audio elementary data, and auxiliary data. The separated video elementary data is supplied to the video data memory 122 in GOP units according to a memory write command from the controller 105. The separated audio elementary data is stored in the audio data memory 123 in GOP units according to a memory write command from the controller 105.
Supplied to The separated auxiliary data is stored in one GOP according to a memory write command from the controller 105.
The data is supplied to the auxiliary data memory 124 in units.

The video data memory 122 stores the supplied video elementary data in GOP units.
The video data memory 122 stores the stored video elementary data in units of 1 GOP according to a memory read command from the controller 105.
25.

The audio data memory 123 stores the supplied audio elementary data in units of 1 GOP. The audio data memory 123 supplies the stored audio elementary data to the audio encoder 126 in GOP units according to a memory read command from the controller 105.

The auxiliary data memory 124 stores the supplied auxiliary data in units of one GOP. The auxiliary data memory 124 supplies the stored auxiliary data to the auxiliary data output processing unit 127 in GOP units according to a memory read command from the controller 105.

The video decoder 125 decompresses the supplied video elementary data in units of one GOP according to the MPEG-2 system. The video decoder 125 outputs the baseband video data generated by expanding the image from the video output terminal 128 to the outside in frame units.

The audio decoder 126 converts the supplied audio elementary data into one in MPEG-2 format.
Voice expansion is performed in GOP units. Audio decoder 126
Synchronizes the baseband audio data generated by the audio expansion with the baseband video data output from the video output terminal 128, and outputs the data from the audio output terminal 129.

The auxiliary data output processing unit 127 is an MPEG
The auxiliary data in the -2 format is converted to a data format that can be output. Auxiliary data output processing unit 127
Outputs the auxiliary data whose data format has been converted from the auxiliary data output terminal 130 in synchronization with the baseband video data output from the video output terminal 128.

Such a data recording / reproducing apparatus 100
Data processing of each unit is performed at processing timings as shown in FIGS. FIG. 10 shows a timing chart of each processing at the time of data recording, and FIG. 11 shows a timing chart of each processing at the time of data reproduction.

As shown in FIG. 10, the recording process is a process from the input of video data to the completion of encoding, and the process from writing of encoded video data to the video data memory 117 until reading. , A bus transfer process, and a write process to the hard disk drive 103 are performed in units of one GOP. Data is transferred in each GOP, and the process proceeds to the next process. As with the video data, the audio data and the auxiliary data are processed in units corresponding to one GOP.

Therefore, the inputted predetermined GOP (for example, the GOP of # 1 shown in FIG. 10) is recorded on the hard disk drive 103 at the processing timing after 3 GOPs.

As shown in FIG. 11, the reproduction process includes a read process from the hard disk drive 103, a bus transfer process, a process during which data transferred from the bus is written to and read from the video data memory 122, and a video process. Processing until video data read from the data memory 122 is decoded and output is 1 GO
The transfer is performed in P units, data is transferred in each GOP, and the process proceeds to the next processing. For audio data and auxiliary data, each process is performed in units corresponding to one GOP, similarly to video data.

Therefore, a predetermined GOP read from the hard disk drive 103 (for example, #GOP shown in FIG. 11)
11 GOPs) are output at the processing timing after 3 GOPs.

[0032]

In such a conventional data recording / reproducing apparatus 100, as shown in FIG. 11, a video decoder 125 and an audio decoder 1 are used.
Before performing decoding processing, the PictureSize information and Pictur included in these data are
e, encoding pattern information, Audio Frame S
Header data such as size information has to be detected from each stream. Therefore, the video decoder 1
25 and the audio decoder 126 have to perform both the decoding processing of the data for one GOP and the detection processing of the header information in the processing time of one GOP. Therefore, in the conventional data recording / reproducing apparatus 100, the processing load on the video decoder 125 and the audio decoder 126 is large, and therefore, the processing time of the entire apparatus cannot be shortened. In addition, the auxiliary data input processing unit 127 must also perform post-processing by analyzing in advance what kind of data content is included in the auxiliary data based on the header information of the auxiliary data.
In the processing time of the OP, both the conversion processing of the auxiliary information and the detection processing of the header information have to be performed.

The present invention has been made in view of such circumstances, and provides a data recording / reproducing apparatus and a data recording / reproducing method which reduce the processing of the data decoding means during reproduction and shorten the processing time. The purpose is to:

[0034]

In order to solve the above-mentioned problems, a data recording / reproducing apparatus according to the present invention is provided with a recording medium and data including audio data and / or video data, and Encoding means for encoding the data, recording means for recording the data encoded by the encoding means on the recording medium, reproduction means for reproducing the data recorded on the recording medium, and reproduction means Decoding means for decoding the data reproduced by the above, and outputting the decoded data; and control means for controlling the encoding means, the recording means, the reproduction means and the decoding means, wherein the control means Obtains the header information included in the data encoded by the encoding unit, and acquires the header information together with the data including the header information. The header information and recording on the recording medium.

In this data recording / reproducing apparatus, the data and the header information of the data are recorded on a recording medium, and when reproducing the data recorded on the recording medium, the header information of the data is recorded on the recording medium. Detect directly from. That is, the data recording / reproducing device extracts the header information included in the data from the data. Then, the data recording / reproducing apparatus records the data stream of the data including the header information and the stream of the header information generated independently of the data stream on a recording medium.

In the data recording / reproducing apparatus according to the present invention, the control means detects the header information recorded on the recording medium together with the data, and records the header information recorded on the recording medium based on the detected header information. The reproduction control of the data is performed.

In this data recording / reproducing apparatus, the header information of the data recorded on the recording medium is directly detected from the recording medium before decoding by the decoding means, and the reproduction control of the data is performed.

A data recording / reproducing method according to the present invention includes a recording process of inputting data including audio data and / or video data, encoding the data, and recording the encoded data on a recording medium; A data recording / reproducing method for reproducing the data recorded on the recording medium, decoding the reproduced data, and outputting the decoded data. And detecting the header information together with the data including the header information on the recording medium.

In this data recording / reproducing method, the data and the header information of the data are recorded on a recording medium, and when reproducing the data recorded on the recording medium, the header information of the data is recorded on the recording medium. Detect directly from. That is, the data recording / reproducing device extracts the header information included in the data from the data. Then, the data recording / reproducing apparatus records the data stream of the data including the header information and the stream of the header information generated independently of the data stream on a recording medium.

The data recording / reproducing method according to the present invention is characterized in that the header information recorded on the recording medium is detected together with the data, and reproduction control of the data recorded on the recording medium is performed. .

In this data recording / reproducing method, the header information of the data recorded on the recording medium is directly detected from the recording medium before decoding by the decoding means, and the reproduction control of the data is performed.

[0042]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a data recording / reproducing apparatus to which the present invention is applied.

The data recording / reproducing apparatus 1 shown in FIG. 1 is a so-called AV server which compresses video data and audio data and stores them on a hard disk.

The data recording / reproducing apparatus 1 includes a recording unit 2 for encoding and recording input video data and the like.
A reproducing unit 3 for decoding and reproducing video data and the like to be output, a hard disk drive 4 for storing video data and the like, and a bus for transmitting data between the recording unit 2 and the reproducing unit 3 and the hard disk drive 4 5 and a controller 6 for controlling the recording unit 2, the reproducing unit 3, and the hard disk drive 4.

The data recording / reproducing apparatus 1 receives input of auxiliary data in which auxiliary data of video data and audio data, and auxiliary information of input video data and audio data are described. The input video data and the like are encoded and recorded by the recording unit 2 and stored in the hard disk drive 4. The data recording / reproducing apparatus 1 reads out compressed video data and the like recorded on the hard disk drive 4, and the reproducing unit 3 decodes and reproduces the video data and the like to convert the baseband video data and the like. Output. The controller 6 issues operation commands and the like, manages the processing timing of the recording unit 2 and the reproduction unit 3, the data transfer timing of the bus 5, the recording and reproduction timing of the hard disk drive 4, and the like, and controls the operation of each unit.

The recording section 2 has a video data input terminal 11
, Audio data input terminal 12, auxiliary data input terminal 13, video encoder 14, audio encoder 15, auxiliary data input processing unit 16, video data memory 17, audio data memory 18, auxiliary data memory 19 , A header data memory 20, and a recording-side interface 21.

The video data input terminal 11 receives baseband video data. The baseband video data is supplied to the video encoder 14.

The audio data input terminal 12 receives baseband audio data. This baseband audio data is stored in the audio encoder 1
5 is supplied.

The auxiliary data input terminal 13 receives auxiliary data indicating auxiliary information of input video data and audio data. This auxiliary data is supplied to the auxiliary data input processing unit 16.

The video encoder 14 compresses the supplied baseband video data according to the MPEG-2 system. The video encoder 14 accumulates the compressed video elementary data without transferring it for one GOP, and supplies the accumulated video elementary data to the video data memory 17 in GOP units in accordance with a memory write command from the controller 6. In addition, 1GO
P is an image processing unit defined by MPEG-2, and generally includes 15 frames.

Here, the video elementary data supplied to the video data memory 17 includes header data. When generating video elementary data that has undergone image compression, the video encoder 14 generates a stream in which header data of the video elementary data is described, which is different from the data stream of the video elementary data. The video encoder 14 supplies the header data to the header data memory 20. Note that the header data supplied to the header data memory 20 need not include all the header data included in the video elementary data but at least information necessary for reproduction.

The audio encoder 15 compresses the supplied baseband audio data according to the MPEG-2 system. The audio encoder 15 supplies the audio-compressed audio elementary data to the audio data memory 18 in a data unit corresponding to one GOP as a processing unit of the video data according to a memory write command from the controller 6.

Here, the audio elementary data supplied to the audio data memory 18 includes header data. The audio encoder 15 generates a stream in which the header data of the audio elementary data is described, which is different from the data stream of the audio elementary data when generating the audio elementary data after the audio compression. The audio encoder 15 supplies the header data to the header data memory 20. The header data memory 20
The header data of the audio elementary data supplied to the audio elementary data is not limited to all the header data included in the audio elementary data, but may include at least information necessary for reproduction.

The auxiliary data input processing unit 16 performs a conversion process for converting the supplied auxiliary data into data of a format conforming to the MPEG data stream. The auxiliary data input processing unit 16 supplies the converted auxiliary data to the auxiliary data memory 19 in a data unit corresponding to one GOP as a processing unit of the video data in accordance with a memory write command from the controller 6.

Here, the auxiliary data supplied to the auxiliary data memory 19 includes header data.
When converting the data format of the auxiliary data into the MPEG-2 format, the auxiliary data input processing unit 16 generates a stream in which header information of the auxiliary data is described, which is different from the data stream of the auxiliary data. The auxiliary data input processing unit 16 stores the header data in the header data memory 2
Supply 0. Note that the header data of the auxiliary data supplied to the header data memory 20 is not limited to all the header data included in the auxiliary data, but may include at least information necessary for reproduction.

The video data memory 17 stores the supplied video elementary data in units of one GOP. The video data memory 17 stores the stored video elementary data in units of 1 GOP according to a memory read command from the controller 6.
Feed to 1.

The audio data memory 18 stores the supplied audio elementary data in units of 1 GOP. The audio data memory 18 stores the controller 6
The stored audio elementary data is supplied to the recording-side interface 21 in GOP units in accordance with a memory read command from.

The auxiliary data memory 19 stores the supplied auxiliary data in units of 1 GOP. Auxiliary data memory 1
9 supplies the stored auxiliary data to the recording side interface 21 in GOP units according to a memory read command from the controller 6.

The header data memory 20 stores the supplied header data in units of one GOP. The header data memory 20 supplies the stored header data to the recording side interface 21 in GOP units according to a memory read command from the controller 6. The header data stored in the header data memory 20 includes, for example, Picture Sis of each picture necessary for reproduction.
ze, PictureCoding Type, Pro
information such as file and Level, information such as frame size, sampling frequency and emphasis of each audio frame, and data size of auxiliary data.
e, information such as ID.

The recording-side interface 21 is provided with one GOP worth of video elementary data, audio elementary data, auxiliary data and header data supplied from the video data memory 17, the audio data memory 18, the auxiliary data memory 19 and the header data memory 20. Is converted into a data format according to a transfer protocol of the bus 5 such as a PCI format, and is transferred to the hard disk drive 4 via the bus 5.

The hard disk drive 4 transfers the transferred video elementary data, audio elementary data, auxiliary data and header data to the controller 6.
Is recorded in units of 1 GOP in accordance with the recording command from.

The reproducing unit 3 includes a reproducing interface 31
A video data memory 32, an audio data memory 33, an auxiliary data memory 34, a header data memory 35, a video decoder 36, an audio decoder 37, an auxiliary data output processing unit 38, a video output terminal 39, It has an audio output terminal 40 and an auxiliary data output terminal 41.

To the reproducing interface 31, video elementary data and the like from the hard disk drive 4 reproduced according to the reproducing command from the controller 6 are transferred via the bus 5. The data to be transferred are video elementary data, audio elementary data, auxiliary data, and header data in a data format according to a transfer protocol of the bus 5 such as a PCI format, and are transferred in units of 1 GOP. . After converting the data format of the transferred data, the reproduction-side interface 31 separates the data into three data streams of video elementary data, audio elementary data, auxiliary data, and header data.

First, of the separated data, the header data is transferred from the reproducing interface 31 to the header memory 35.
Supplied to Here, the controller 6 reads the data size information of the video elementary data, the audio elementary data, and the auxiliary data from the header data stored in the header memory 35. Controller 6
Is 1 GOP based on data size information of each data.
A memory write command, which is a processing command for writing the data of the minute data amount to each of the memories 32 to 34 from the reproduction side interface 31, is issued. The playback-side interface 31 converts the separated video elementary data into 1 GO according to a memory write command from the controller 6.
The data is supplied to the video data memory 32 in P units. In addition, the reproduction side interface 31 supplies the separated audio elementary data to the audio data memory 33 in GOP units according to a memory write command from the controller 6. Also, the playback side interface 3
1 supplies the separated auxiliary data to the auxiliary data memory 34 in units of 1 GOP in accordance with a memory write command from the controller 6.

When the header data is stored in the header data memory 35, the controller 6 reads out all the header data stored in the header memory 35 and analyzes the header data. And the controller 6
Is information necessary for decoding and reproducing video data obtained as a result of analyzing the header data, for example, Picture Size, Picture C of each picture.
The information such as the coding Type, Profile, and Level is supplied to the video decoder 36. The controller 6 also provides information necessary for decoding audio data obtained as a result of analyzing the header data, for example,
Information such as the frame size, sampling frequency, and emphasis of each audio frame is supplied to the audio decoder 37. Further, the controller 6 provides information necessary for changing the auxiliary data obtained as a result of analyzing the header information, for example, Data Si of the auxiliary data.
Information such as ze and ID is supplied to the auxiliary data output processing unit 38.

The video data memory 32 stores the supplied video elementary data in GOP units. The video data memory 32 stores the stored video elementary data in the video decoder 36 in GOP units according to a memory read command from the controller 6.

The audio data memory 33 stores the supplied audio elementary data in units of one GOP. The audio data memory 33 includes the controller 6
Supplies the stored audio elementary data to the audio encoder 37 in GOP units in accordance with the memory read command from.

The auxiliary data memory 34 stores the supplied auxiliary data in units of 1 GOP. Auxiliary data memory 3
4 supplies the stored auxiliary data to the auxiliary data output processing unit 38 in 1 GOP units according to a memory read command from the controller 6.

The header data memory 35 stores the supplied header data. The header data memory 34 supplies the header data to the controller 6. The header data memory 34 supplies each header data to the video decoder 36, the audio decoder 37, or the auxiliary data output processing unit 38 according to a memory read command from the controller 6.

The video decoder 36 decompresses the supplied video elementary data in units of 1 GOP according to the MPEG-2 system. The video decoder 36 outputs the baseband video data generated by expanding the image from the video output terminal 39 to the outside in frame units. At this time, the video decoder 36
The decoding processing is performed based on the information supplied from the controller 6 without analyzing the header data included in the video elementary data supplied from the controller 6. Therefore, the video decoder 36 does not need to perform the analysis processing of the header data, the decoding processing is reduced, and the decoding processing can be speeded up.

The audio decoder 37 converts the supplied audio elementary data into an MPEG-2
Voice expansion is performed in OP units. The audio decoder 37
The baseband audio data generated by expanding the audio is output from the audio output terminal 40 in synchronization with the baseband video data output from the video output terminal 39. At this time, the audio decoder 37 does not analyze the header data included in the audio elementary data supplied from the audio data memory 33, but performs a decoding process based on the information supplied from the controller 6. Therefore, in the audio decoder 37,
It is not necessary to perform the analysis processing of the header data, the decoding processing is reduced, and the decoding processing can be speeded up.

The auxiliary data output processing section 38 is an MPEG-
The auxiliary data in the two-system data format is converted into an output-capable data format. The auxiliary data output processing unit 38
The auxiliary data whose data format has been converted is supplied to the video output terminal 3
9 is output from the auxiliary data output terminal 41 in synchronization with the baseband video data output from the auxiliary data output terminal 9. At this time,
The auxiliary data output processing section 38 does not analyze the header data included in the auxiliary data supplied from the auxiliary data memory 34, but performs a conversion process based on the information supplied from the controller 6. Therefore, the auxiliary data output processing unit 3
In No. 8, the header data analysis process does not need to be performed, the conversion process is reduced, and the speed of the conversion process can be increased.

The data recording / reproducing apparatus 1 has the structure shown in FIG.
The data processing of each unit is performed at the processing timing shown in FIG. FIG. 2 shows a timing chart of each processing at the time of data recording, and FIG. 3 shows a timing chart of each processing at the time of data reproduction.

As shown in FIG. 2, the recording process is a process from the input of video data to the completion of encoding, and the process of writing encoded video data to the video data memory 17 and reading it out. , A bus transfer process, and a write process to the hard disk drive 4 are performed in units of one GOP, and data transfer is performed for each GOP, and the process proceeds to the next process. The audio data and auxiliary data are also 1 in the same manner as the video data.
Each process is performed in a unit corresponding to the GOP.

Therefore, the inputted predetermined GOP (for example, the GOP of # 1 shown in FIG. 2) is recorded on the hard disk drive 4 at the processing timing after 3 GOPs.

Here, in the recording process, the header data included in the video elementary data and the like generated at the time of encoding is transferred to the header data memory 20. The header data transferred to the header data memory 20 is transferred to the hard disk drive 4 via the bus 5 together with the video elementary data, the audio elementary data, and the auxiliary data at the time of the bus transfer.
The hard disk drive 4 records the transferred header data together with the video elementary data and the like.

As shown in FIG. 3, the reproducing process includes a reading process from the hard disk drive 4, a bus transfer process, and a process for transferring data transferred from the bus to the video data memory 3.
2 and processing until the video data read from the video data memory 32 is decoded and output is performed in units of 1 GOP, and data is transferred in units of 1 GOP. To the next process. For audio data and auxiliary data, each process is performed in units corresponding to one GOP, similarly to video data.

Accordingly, a predetermined GOP (for example, GOP # 11 shown in FIG. 3) read from the hard disk drive 4 is output at a processing timing after three GOPs.

In the reproduction process, the header data is written to the header data memory 35 prior to writing the video elementary data or the like at the time of writing to the memory. When the header data is written into the header data memory 35, the controller 6 starts analyzing the header data. Therefore, the controller 6 analyzes the header data at least one GOP or more before the data is supplied, instead of being analyzed after the data is supplied to the video decoder 36 as in the related art.
Therefore, at the time of reproduction, the processing load at the time of decoding can be reduced, and the speed of the processing at the time of decoding can be increased.

As described above, in the data recording / reproducing device 1 to which the present invention is applied, when recording the compression-encoded video elementary data or the like on the hard disk drive 4, the header included in the video elementary data or the like is used. The information is recorded on the hard disk drive 4. At the time of reproduction, header data such as video elementary data recorded on the hard disk drive 4 is directly detected from the hard disk drive 4 and reproduction control of the video elementary data and the like is performed. For this reason, in the data recording / reproducing apparatus 1, the load of the decoding process can be reduced and the speed of the reproducing process can be increased.

Next, the specific data contents of the header data recorded on the hard disk drive 4 will be described. The data example shown below is Number_of_GOP = 1,
Number_of_Picture = 15, Number_of_AFRAME = 21, Numbe
r_of_Audio_Stereo_Channel = 2, Number_of_AUX_Data = 4
Is the case.

FIG. 4 shows the data structure of one GOP of MPEG-2 data.

As shown in FIG. 4, one GOP of MPEG-2 data includes System_Layer_Header and Video
_Layer_Header, Video_Stream_byte, Audio_1 / 2ch_
Layer_Header, Audio_1 / 2ch_Layer_byte, Audio_3 /
4ch_Layer_Header, Audio_3 / 4ch_Layer_byte, AUX_
It is composed of Layer_Header and AUX_Date_byte.

System_Layer_Header is 128 bytes of information and is header information for controlling all data in one GOP. Video_Layer_Header is 376 bytes of information, and is header information of video data. Video_Stream_b
yte is one GOP worth of video elementary data. Audio_1 / 2ch_Layer_Header is information of 104 bytes and is header information of one of the two audio data. Audio_1 / 2ch_Layer_byte
Is audio elementary data of one of the two audio data. Audio_3 / 4ch_Layer_Header
Is information of 104 bytes and is header information of the other audio data of the two audio data. Au
dio_3 / 4ch_Layer_byte is the other audio elementary data of the two audio data. AUX_
Layer_Header is 76-byte information and is header information of auxiliary data. AUX_Date_byte is auxiliary data.

The hard disk drive 4 includes a data stream having the above-described data structure and a System_Layer_Header and a Video_Layer different from the data stream.
er_Header, Audio_1 / 2ch_Layer_Header, Audio_3 / 4ch_L
A stream of header data in which ayer_Header and AUX_Layer_Header are described is recorded.

Next, the data structure of header data recorded as a stream different from the MPEG-2 data stream will be described.

First, the contents of System_Layer_Header will be described. FIG. 5 shows a data structure of System_Layer_Header.

Wing_Header_ID is 56-bit ID data representing Wing Data. In the ASCII code, "Wing_ID" is described. Header_Version_ID is
This is 8-bit ID data representing the version of the header data. System_Layer_Header_byte_Length is
This is 32-bit information indicating the number of bytes of Layer_Header. Video_Layer_Header_Position is 32-bit information indicating from which position in the recording unit the Video_Layer_Header starts, and indicates the number of bytes from the head of the recording unit.

Audio_1 / 2ch_Layer_Header_Position is
From any location within this recording unit,
This is 32-bit information indicating whether 1 / 2ch_Layer_Header has started, and indicates the number of bytes from the head of this recording unit. If the data is 0, the channel is not recorded. Audio_3 / 4ch_Layer_
Header_Position is 32-bit information indicating from which position in the recording unit the Audio_3 / 4ch_Layer_Header has started, and indicates the number of bytes from the head of the recording unit. If the data is 0, the channel is not recorded. Audio_5 / 6ch_Layer_Header_Position is the audio_5 / 6ch_Layer from any position in this recording unit.
This is 32-bit information indicating whether or not yer_Header has started, and indicates the number of bytes from the head of this recording unit. If the data is 0, the channel is not recorded. Audio_7 / 8ch_Layer_Header_P
The osition is 32-bit information indicating from which position in the recording unit the Audio_7 / 8ch_Layer_Header starts, and indicates the number of bytes from the head of the recording unit. If the data is 0, the channel is not recorded.

Note that the above Audio_n / mch_Layer_Header_P
The osition is recorded only in header data recorded as a stream different from the MPEG-2 data stream.

[0092] AUX_Layer_Header_Position is the AUX_Layer_Head from any position in this recording unit.
This is 32-bit information indicating whether or not er has started, and indicates the number of bytes from the head of this recording unit. Recording_Unit_byte_Length is 32-bit information indicating the number of bytes of this recording unit. Number_of_Recording_Unit_Field is 8-bit information representing the time required for reproducing this recording unit in field units. For example, when there are 2-3 pull-downs, even if one GOP is 15 frames, it is provided because the reproduction time is different. Recording_Un
it_Closed_Flag is information indicating whether the first GOP of this recording unit is a closed GOP. If the GOP is a closed GOP, it can be reproduced from the beginning of the recording unit. If it is not a closed GOP, it must be reproduced from the previous recording unit. Error_Flag is information indicating whether an error exists in this recording unit. If there is no error, it is set to “0”. If there is an error, it is set to “1”. This Error_Flag is
It is recorded only in the header data recorded as a stream different from the PEG-2 data stream. Crash_Flag
Is information indicating whether or not the recording unit has been completely extracted. Set to "0" if the data can be completely extracted, and set to "1" if it cannot be completely extracted. Recording_Unit_Closed_Flag and Error
_Flag and Crash_Flag form a total of 8 bits of data. Crcc_Flag_Mode is 3 indicating the mode to attach Crcc
Bit information. B2 for 3 bit MSB and LSB for 3 bit
When b0, when b0 = 1 Cr at the end of each Picture_Stream
Add cc, and when b1 = Crc at the end of each Audio_Frame_Stream
Add c and add Crcc at the end of each AUX_Data_byte when b2 = 1. System_Layer_Header_Crcc_Flag is System_Laye
This is 1-bit information indicating whether Crcc of r_Header is valid. It is set to “0” when Crcc is invalid, and is set to “1” when Crcc is valid. GOP_ID is this GOP
Is 32-bit information indicating the order of the GOP from the start of recording. If it is a recording start GOP,
Set to “0001h”. Scanning_System_Flag is 8-bit information indicating the number of lines, field frequency, and aspect ratio. The contents indicated by the 8-bit Scanning_System_Flag data are as follows. “00000000” No information “00000001” 525 / 59.94 / 4x
3 “00000010” 626/50 / 4x3 “00000011” Reserved “0000
0100 ”Reserved“ 00000101 ”525 / 59.94 / 16x9“ 0000011
“0” 625/50 / 16x9 “00000111” to “11111111” Reserved mark_bit is a reserved bit.
r_Crcc is an 8-bit System_Layer_Header_ Crcc code. Crcc is 1b from the beginning of System_Layer_Header
Calculate up to System_Layer_header_byte_Length-1 for each yte, and add a 1-byte Crcc code at the end. If Crcc is invalid, set to “00h”.

Next, the contents of Video_Layer_Header will be described. FIG. 6 shows the data structure of Video_Layer_Header.

Video_Layer_Header_byte_Length is Vide
This is 16-bit information indicating the number of bytes of o_Layer_Header. Video_Layer_Header_Crcc_Flag is Video_Layer_He
This is 1-bit information indicating whether the Crcc code of ader is valid. It is set to “0” when Crcc is invalid, and is set to “1” when Crcc is valid. Video_Vertical_Size
_Flag is 2-bit information indicating the number of pixels in the vertical direction of the image. “00” indicates 480 pixels, “01” indicates 512 pixels, and “10” indicates 240 pixels.
“11” is a reserve. Video_Horizontal_Siz
e_Flag is 2-bit information indicating the number of pixels in the horizontal direction of the image. “00” indicates 720 pixels, “01” indicates 544 pixels, “10” indicates 480 pixels, and “11” indicates 352 pixels. Video_Profile_Level_Flag
Is 4-bit information indicating Profile and Level. “00
"00" indicates MP @ ML, "0001" indicates 422 @ ML, Video_Source_Composite_Flag is 1-bit information indicating whether or not the source of the video data is a composite signal, and "1" indicates that the source is a composite signal. “0” indicates that the source is a component signal, “Video_Source_Analog_Flag” is 1-bit information indicating whether the source of the video data is an analog signal, and “1” indicates that the source is an analog signal. Signal_0 indicates that the source is a digital signal, Number_of_GOP is 4-bit information indicating the number of GOPs included in this recording unit, and Video_Coding_Rate is a video element. This is 32-bit information indicating the bit rate of the mental data stream.

[0095] Sequence_Header_Flag is 1-bit information indicating whether or not a sequence header exists at the head of the GOP. If there is no sequence header at the beginning of the GOP, the video decoder cannot accurately decode the video data. Sequence_End_Flag
Is 1-bit information indicating whether a sequence end code exists in the GOP. Number_of_picture
Is 4-bit information indicating the number of pictures included in the GOP. Note that the above Sequence_Header_Flag and Sequence
ence_End_Flag and Number_of_picture are information added in GOP units.

[0096] Picture_Stream_byte_Length is information indicating the number of bytes of picture data. Specifically, Sequ
ence_start_code, group_start_code or picture_start
_code, the next Sequence_start_code, group_start_co
This is 32-bit information indicating the length up to de or picture_start_code. Picture_Crcc_Flag is C for each picture
This is 1-bit information indicating whether an rcc code is attached. Crcc uses Picture_for every 1 byte from the beginning of the picture.
Calculate up to Stream_byte_Length, and finally 1 byte of Cr
Add cc code. If Crcc is invalid, set to “00h”. Picture_32bitAlign_byte_Length is a 2-bit additional byte added to make the number of bytes of picture data a multiple of four. Picture_Coding_Type is information indicating the coding structure of a picture. Picture_Coding_T
The 3-bit data of ype indicates the following contents. “000” forbidden “001” intra-coded (I) “010” predic
tive-coded (P) “011” bidirectionally-predictive-cod
ed (B) “100” shall not be used (dc intra-coded (D))
“101” reserved “110” reserved “111” reserved PTS_Field is 8-bit information indicating the picture output timing as the number of fields from the first picture of the recording unit. PTS_Field is this MP
Only the header data recorded as a stream different from the EG-2 data stream is recorded. PTS indicates a PTS (Presentation Time Stamp) of each picture.
This is 3-bit information. PTS represents the output time of a picture with 90 kHz accuracy. Color_Frame is
This is 3-bit information representing a color frame. If the picture is a frame, the color frame of the first field is recorded. B2 for the 3-bit MSB and b0 for the LSB
B0 indicates the color frame 0, b1 indicates the color frame 1, and b2 indicates the color frame 2. DT
S_Field indicates the decoding timing of the picture,
This is 8-bit information expressed as the number of fields from the first picture of the recording unit. DTS_Field is
It is recorded only in header data recorded as a stream different from this MPEG-2 data stream. DTS
Is 33-bit information indicating the DTS (Decoding Time Stamp) of each picture. DTS represents the decoding time of a picture with 90 kHz accuracy. VB
V_Occupancy is 32-bit information indicating the number of bytes of the VBV buffer immediately before data extraction of the virtual decoder. From above Picture_Stream_byte_Length to VBV_
Information up to Occupancy is information repeatedly added for each picture.

Video_Layer_Header_Crcc is Video_Layer
_Header_ is an 8-bit Crcc code. Crcc, Vide
Video_Layer_head for every 1 byte from the beginning of o_Layer_Header
Calculate up to er_byte_Length-1 and Crcc of last one byte
Add code. If Crcc is invalid, set to “00h”.

Next, the contents of Audio_Layer_Header will be described. FIG. 7 shows a data structure of Audio_Layer_Header. When there are a plurality of audio data, Audio_Layer_Header is provided by the number of channels.

Audio_Layer_Header_byte_Length is Audi
This is 16-bit information indicating the number of bytes of o_Layer_Header. Audio_Layer_Header_Crcc_Flag is Audio_Layer_He
This is 1-bit information indicating whether the Crcc code of ader is valid. It is set to “0” when Crcc is invalid, and is set to “1” when Crcc is valid. FS is 2-bit information indicating the sampling frequency of audio data. When the sampling frequency is 44.1 kHz, "0
0 "and" 01 "at 48 kHz and 32 kHz
In this case, it is set to “10”. “11” is a reserve. Au
dio_Emphasis_Flag is 1-bit information indicating audio emphasis. “0” indicates OFF,
"1" indicates ON. Audio_Coding_Rate is 4-bit information indicating the bit rate of the compressed audio data. The 4-bit information of Audio_Coding_Rate specifically indicates the following bit rate.

[0100]

[Table 1]

Audio_Validity_Flag is 1-bit information indicating "0" when audio data is valid and "1" when audio data is invalid. Audio_Source_Analog_Flag is
This is 1-bit information indicating whether the source of the audio data is an analog signal. Set to “1” when the source is an analog signal, and set to “0” when the source is a digital signal. Duplicate_Flag is 2-bit information indicating whether the beginning or end of this recording unit contains data (extra data) that overlaps with other recording units. Set to “00” when there is no extra data, set to “01” when extra data is included at the beginning, and set to “10” when extra data is included at the end, If marginal data is included at the beginning and end, it is set to “11”. Number_of_GOP is 4-bit information indicating the number of GOPs included in this recording unit. Number_of_Audio_Quantization
_Bit is 4-bit information indicating quantization bits of audio data. Specifically, Number_of_Audio_Quantization_Bit indicates the following information. “0000” indicates that the quantization bit is 16 bits, and “0001” indicates 17 bits.
Bits, “0010” is 18 bits, “0011” is 19 bits, “0100” is 20 bits, “0101” is 21 bits,
“0110” is 22 bits, “0111” is 23 bits, “100”
"0" indicates 24 bits, and the others indicate reserve. Audio_Cod
ing_Flag is 2-bit information indicating encoding information of audio data. “0” for MPEG Audio Layer II
0 ”and“ 01 ”for Linear PCM.
Is a spare bit.

[0102] Number_of_Audio_Frame is 5-bit information indicating the number of audio frames included in the GOP. It also includes the audio frames containing the extra data. PTS_FS indicates the output timing of an audio frame as 1 relative to the video reference frame.
This is 1-bit information. PTS_FS is recorded only in header data recorded as a stream different from this MPEG-2 data stream. Audio_PTS is 33-bit information indicating a PTS (Presentation Time Stamp) of each audio frame. PTS represents the output time of an audio frame with 90 kHz accuracy.
Note that the above Number_of_Audio_Frame, PTS_FS, and Audio_P
TS is information added in GOP units.

Audio_Frame_Stream_byte_Length is 16-bit information indicating the number of bytes of audio data.

Audio_Frame_Crcc_Flag is 1-bit information indicating whether the Crcc code is valid in audio frame units.

[0105] Audio_32bitAlign_byte_Length is a 2-bit additional byte added to make the number of bytes of audio data a multiple of four. Edit_Flag is information indicating that the audio frame has been edited. “00” indicates that it has not been edited, and “01”
Indicates an in point, “10” indicates an out point, and “11” indicates a reserve.

The information from Audio_Frame_Stream_byte_Length to Edit_Flag is information added for each audio frame.

Audio_Layer_Header_Crcc is 8-bit A
This is the Crcc code of udio_Layer_Header_. Crcc, Audi
Audio_Layer_head for every 1 byte from the beginning of o_Layer_Header
Calculate up to er_byte_Length-1 and finally 1 byte Crcc
Add code. If Crcc is invalid, set to “00h”.

Next, the contents of AUX_Layer_Header will be described. FIG. 8 shows a data structure of Audio_Layer_Header.

[0109] AUX_Layer_Header_byte_Length is AUX_Layer.
This is 16-bit information indicating the number of bytes of yer_Header.
AUX_Layer_Header_Crcc_Flag is the Cr of AUX_Layer_Header
This is 1-bit information indicating whether the cc code is valid.
Number_of_GOP is 4-bit information indicating the number of GOPs included in this recording unit.

[0110] Number_of_AUX_Data is 8-bit information indicating the number of AUX_Data included in this recording unit. This Number_of_AUX_Data is GO
It is added for each P.

AUX_Data_Position indicates from which position in the AUX_Layer the recording of AUX_Data has started 32.
Bit information. AUX_Data_byte_Length is AUX_Da
This is 32-bit information indicating the number of bytes of ta.

AUX_Data_ID indicates the type of AUX_Data.
This is the bit ID. In this AUX_Data_ID, VIT
C, Video Index, Non Compresss
sedLine Data, Audio Channel
l Status ch1 / 2, Audio Chan
nel Status ch1 / 2 is identified. AU
X_Data_PTS_Field is 8-bit information indicating the output timing of AUX_Data by the number of fields from the head of the recording unit. AUX_Data_PTS_Field is recorded only in header data recorded as a stream different from the MPEG-2 data stream. AUX_Data
_Crcc_Flag is 1-bit information indicating whether the Crcc code of AUX_Layer_Header is valid. It is set to “0” when Crcc is invalid, and is set to “1” when Crcc is valid. AUX_32bitAlign_byte_Length is a 2-bit additional byte added to make the number of bytes of auxiliary data a multiple of four. AUX_Data_PTS is 33-bit information indicating the PTS of the auxiliary data.

The above AUX_Data_Position to AUX_Data_PT
The information of S is added in units of auxiliary data.

AUX_Layer_Header_Crcc is AUX_Layer_Hea
der_ is an 8-bit Crcc code. Crcc is AUX_Laye
AUX_Layer_header_byte_ for each 1 byte from the beginning of r_Header
Calculate up to Length-1 and add the last 1 byte Crcc code. If Crcc is invalid, set to “00h”.

Note that AUX_VBI_Line_Flag is AUX_Data_ID
Is Video Index or Non Compresses
AUX_Data_PTS when indicating sed line data
Replace with LSB side 16 of 32-bit data
Video Index of 1st field with bit
Line or Non Compressed Line
Is specified. In addition, of 32 bits of data, 16 bits of the MSB side and a video index of 2nd field
x Line or Non Compressed Lin
Specify e. The line is specified from the rising edge of VD.
An arbitrary line is designated from the 16 lines by 2-byte data. One line is assigned to each bit, and by setting 1 to the corresponding bit, Vi
deo Index Line or Non Compr
Essed Line data is inserted. Video
The Index Line can be specified by 1 Line / Field, and the Non Compressed Line is 3Li
It can be specified by ne / Field.

The relationship between each bit and the line is as shown in the following table.

[0117]

[Table 2]

[0118]

According to the data recording / reproducing apparatus and the data recording / reproducing method of the present invention, header information of the data is recorded on a recording medium together with the data, and the data recorded on the recording medium is reproduced. Then, the header information of the data is directly detected from the recording medium. In the present invention, the header information of the data recorded on the recording medium is directly detected from the recording medium before being decoded by the decoding means, and the reproduction control of the data is performed. For this reason, according to the present invention, it is possible to reduce the load of the decoding process and to speed up the reproduction process.

[Brief description of the drawings]

FIG. 1 is a block diagram of a data recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is a timing chart for explaining data processing at the time of recording by the data recording / reproducing apparatus.

FIG. 3 is a timing chart for explaining data processing during reproduction of the data recording / reproducing apparatus.

FIG. 4 is a diagram illustrating a data structure of one GOP of MPEG-2 data.

FIG. 5 is a diagram illustrating a data structure of System_Layer_Header.

FIG. 6 is a diagram illustrating a data structure of Video_Layer_Header.

FIG. 7 is a diagram illustrating a data structure of Audio_Layer_Header.

FIG. 8 is a diagram illustrating a data structure of Audio_Layer_Header.

FIG. 9 is a block diagram of a conventional data recording / reproducing device.

FIG. 10 is a timing chart for explaining data processing during recording by the conventional data recording / reproducing apparatus.

FIG. 11 is a timing chart for explaining data processing at the time of reproduction by the conventional data recording / reproducing apparatus.

[Explanation of symbols]

1 data recording / reproducing device, 2 recording unit, 3 reproducing unit, 4
Hard disk drive, 5 buses, 6 controllers

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 27/10 A F-term (Reference) 5C053 FA23 GA10 GA13 GB06 GB11 GB38 HA32 JA03 5C059 KK15 MA00 PP04 RB09 RC24 RC32 SS11 SS13 UA02 UA05 UA31 UA39 5D044 AB05 AB07 BC01 CC04 DE17 DE52 GK08 GK12 5D066 DA02 DA11 5D077 AA22 DC21 DE01 DF01

Claims (8)

[Claims] 1. A recording medium, data including audio data and / or video data is input, and encoding means for encoding the data, and the data encoded by the encoding means are recorded on the recording medium. Recording means for recording on a medium, reproducing means for reproducing the data recorded on the recording medium, decoding the data reproduced by the reproducing means,
A decoding unit for outputting the decoded data; and a control unit for controlling the encoding unit, the recording unit, the reproduction unit, and the decoding unit. The control unit is coded by the encoding unit. A data recording / reproducing apparatus, wherein header information included in the data is obtained, and the header information obtained together with the data including the header information is recorded on the recording medium. 2. The control means detects the header information recorded on the recording medium together with the data, and controls reproduction of the data recorded on the recording medium based on the detected header information. 2. The data recording / reproducing apparatus according to claim 1, wherein: 3. The encoding unit performs encoding based on the MPEG-2 standard, the decoding unit performs decoding based on the MPEG-2 standard, and the control unit includes a system header, a video data header, and an audio data. MPEG-2 header information including a data header and an auxiliary data header is detected, and an audio data header,
2. The data recording / reproducing apparatus according to claim 1, wherein information including information indicating a storage position of a video data header and an auxiliary data header is recorded on the recording medium. 4. The encoding unit performs encoding based on the MPEG-2 standard, the decoding unit performs decoding based on the MPEG-2 standard, and the control unit includes a system header, a video data header, and an audio header. MPEG-2 header information consisting of a data header and an auxiliary data header is detected, and the detected header information includes the output timing of audio data, video data and auxiliary data in a field unit. 2. The data recording / reproducing apparatus according to claim 1, wherein the data is recorded on the recording medium. 5. Inputting data including audio data and / or video data, encoding the data,
Data for performing a recording process of recording the encoded data on a recording medium, and a reproducing process of reproducing the data recorded on the recording medium, decoding the reproduced data, and outputting the decoded data. A data recording / reproducing method, comprising detecting header information included in encoded data, and recording the header information together with the data including header information on the recording medium. Method. 6. The data recording / reproduction according to claim 5, wherein the header information recorded on the recording medium together with the data is detected, and reproduction control of the data recorded on the recording medium is performed. Method. 7. Encoding and decoding are performed based on the MPEG-2 system, and MPEG-2 system header information including a system header, a video data header, an audio data header and an auxiliary data header is detected, and the detected header is detected. For information, including information indicating the storage position of audio data header, video data header and auxiliary data header,
6. The data recording / reproducing method according to claim 5, wherein the data is recorded on the recording medium. 8. Encoding and decoding are performed based on the MPEG-2 system, and MPEG-2 system header information including a system header, a video data header, an audio data header, and an auxiliary data header is detected, and the detected header is detected. 6. The data recording / reproducing method according to claim 5, wherein output timings of audio data, video data, and auxiliary data are recorded on the recording medium, including information expressed in field units.