JP3903909B2 - Video signal recording and playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a video signal recording / reproducing apparatus for recording and reproducing a video signal, and a video signal recording / reproducing method for efficiently managing a video file.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, video signal recording / reproducing apparatuses that record and reproduce video signals include a DVD-VR (DVD-Video Recording) system as a recordable DVD system (see, for example, Non-Patent Document 1). This is a method that allows special playback, editing, management, and the like of a PG (program) recorded on a DVD disc, and its data structure (file system) is limited to UDF (Universal Disc Format) 2.0. .
[0003]
FIG. 8 is a block diagram of a conventional video signal recording / reproducing apparatus, and FIG. 9 is a data structure diagram of management information of a DVD disk. In FIG. 8, 700 is an input unit, 701 is an encoding unit, 702 is a management information generation unit, 703 is a recording unit, 704 is a recording medium, 705 is a reproduction unit, 706 is a decoding unit, and 707 is an output unit. In FIG. 9, reference numerals 710 to 714 denote data recorded as management information.
[0004]
The operation of the video signal recording / reproducing apparatus configured as described above will be described.
[0005]
The image signal input from the input unit 700 is input to the encoding unit 701.
[0006]
At the time of recording, the encoding unit 701 performs high-efficiency encoding on the input image and outputs a compressed stream and encoding information. The encoded information is input to the management information generation unit 702, and the compressed stream is input to the recording unit 703.
[0007]
The management information generation unit 702 generates management information from the input encoded information. Management information is input to the recording unit 703.
[0008]
The recording unit 703 records the input compressed stream and management information on the recording medium 704.
[0009]
During playback, the playback unit 705 reads the compressed stream and management information from the recording medium 704. The read compressed stream and management information are input to the decoding unit 706. The decoding unit 706 performs the input compressed stream and management information, and outputs a reproduced image.
[0010]
The reproduced image is input to the output unit 707, and the output unit 707 displays the input reproduced image on the display system.
[0011]
The VR format is composed of five files 710 to 714. VR_MANGR. Video file management information is recorded in a file 710 which is an IFO. VR_MOVIE. A compressed video stream is recorded in the file 711 which is a VRO. VR_STILL. Still image data is recorded in a file 712 which is a VRO. VR_AUDIO. The audio data for after-recording is stored in VR_MANGR. In the file 714 that is a BUP, VR_MANGR. The contents of the IFO are recorded as a backup.
[0012]
[Non-Patent Document 1]
DVD Forum, “DVD Specifications for Rewritable / Re-Recording Discs Part 3: Video Recording Version 1.0” September 1999.
[0013]
[Problems to be solved by the invention]
However, since the VR method in the conventional video signal recording / reproducing apparatus is based on the UDF 2.0, there are many problems when the VR method is applied to other file systems. For example, in the VR method, a compressed video stream is converted to VR_MOVIE. It is recorded in one file of VRO, but this file exceeds 4 GB at the maximum. The file system used in a PC (personal computer) or the like has a limit on the file size, and VR_MOVIE. VRO files may not be handled. The VR method uses a CDA (Contiguous Data Area) algorithm that determines a recording area on a DVD disk so that seamless read / write can be ensured due to the problem of seek performance of the DVD disk. The upper limit was determined. However, there is no need to limit the recording rate by CDA and further CDA for a recording medium having a seek speed higher than that of a DVD disk such as HDD (hard disk drive), and the recording rate cannot be improved because of this.
[0014]
The present invention solves the above-described conventional problems, and can be recorded on a recording medium with an arbitrary file system without being restricted by a file size or the like, and can open and close a file at a higher speed. An object of the present invention is to provide a video signal recording / reproducing apparatus capable of performing the above.
[0017]
[Means for Solving the Problems]
  The present inventionThe projectionAn image signal recording / reproducing apparatus includes: an encoding unit that performs compression processing on an input video signal to generate a compressed stream; a management information generation unit that generates management information from the video signal and the compressed stream; A division information generation unit that generates division information for dividing an object that is a unit into a base file that is a basic unit of recording on a recording medium, the management information, the division information, and the compressed streamWhenBased on the division informationSaidA recording unit for recording on a recording medium, a reproducing unit for acquiring the compressed stream, the management information, and the division information recorded on the recording medium, and reproduction by the compressed stream, the management information, and the division information Decoding unit for processingWhenWithThe recording unit prepares a first division information file and a second division information file as the division information recording file, and in recording the division information into the first division information file, All the data in the buffer, followed by recording a counter, subsequently writing all the data in the buffer, then writing the division information, then recording the counter, and writing the counter to the second division information file. In recording the division information, all the data in the buffer is written, and then the counter is recorded, then all the data in the buffer is written, then the division information is written, and then the counter is recorded, The reproduction unit compares the counter value when reading the division information and determines a division information file to be read.This is a video signal recording / reproducing apparatus.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
(Embodiment 1)
FIG. 1 is a block diagram of a video signal recording / reproducing apparatus according to the first embodiment of the present invention, FIG. 2 is a data structure diagram of management information of a recording medium, and FIG. 3 is a stream configuration comparison diagram. In FIG. 1, 100 is an input unit, 101 is an encoding unit, 102 is a management information generation unit, 103 is a division information generation unit, 104 is a data recording unit, 105 is a recording medium, 106 is a data reproduction unit, and 107 is a decoding unit. Reference numeral 108 denotes an output unit. As the recording medium, an HDD (Hard Disk Drive) is assumed. In FIG. 2, reference numerals 110 to 116 denote data recorded as management information.
[0026]
The operation of the video signal recording / reproducing apparatus of the present embodiment configured as described above will be described.
[0027]
The image signal input from the input unit 100 is input to the encoding unit 101.
[0028]
At the time of recording, the encoding unit 101 performs high-efficiency encoding on an input image and outputs a compressed stream and encoding information. The encoded information is input to the management information generation unit 102 and the division information generation unit 103, and the compressed stream is input to the data recording unit 104.
[0029]
The management information generation unit 102 generates management information from the input encoded information. Management information is input to the data recording unit 104.
[0030]
The division information generation unit 103 generates division information for dividing the object into small files called base files from the input encoded information and the recording information input from the data recording unit 104. The division information is input to the data recording unit 104.
[0031]
The data recording unit 104 records the input compressed stream, management information, and division information on the recording medium 105. At this time, the compressed stream is recorded in units of base files. Further, the recording information is output. The record information is input to the division information generation unit 103.
[0032]
At the time of reproduction, the data reproduction unit 106 determines a base file to be read from the management information and the division information from the recording medium 105, and reads the compressed stream. The read compressed stream and management information are input to the decoding unit 107. The decoding unit 107 performs a decoding process based on the input compressed stream and management information, and outputs a reproduced image.
[0033]
The reproduced image is input to the output unit 108, and the output unit 108 displays the input reproduced image on the display system.
[0034]
As shown in FIG. 2, in the video signal recording / reproducing apparatus of the present embodiment, the management information is composed of seven files 110-116. VR_MANGR. Video file management information is recorded in the file 110 which is an IFO. VR_MOVIE. A compressed video stream is recorded in the file 111 which is a VRO. VR_STILL. Still image data is recorded in the file 112 which is a VRO. VR_AUDIO. The audio data for post-recording is stored in VR_MANGR. In the file 114 which is a BUP, VR_MANGR. The contents of the IFO are recorded as a backup. Furthermore, STR_DIV. In the file 115 which is TBL, the division information into the base file of the object is STR_DIV. The file 116 which is a BUP contains STR_DIV. The contents of TBL are recorded as a backup.
[0035]
Next, with reference to FIG. 3, the difference in object handling between the present embodiment and the conventional VR format will be described. In FIG. 3, reference numeral 200 denotes all compressed streams recorded on the recording medium. Reference numerals 210 and 211 denote objects which are basic units of the program, and are object 1 and object 2, respectively. In the present embodiment, there are two objects. Reference numerals 220 to 224 denote base files which are basic recording units, and are a base file 1, a base file 2, a base file 3, a base file 4, and a base file 5, respectively. In this embodiment, there are five base files. Object 1 is composed of three base files of base files 1, 2, and 3, and object 2 is composed of two base files of base files 4, 5, and this information is called division information. The base file size is fixed except for the final base file of the object. In FIG. 3, the base files 1, 2, and 4 have a fixed size, and the base files 3 and 5 are variable depending on the size of the object.
[0036]
230 is a view of the compressed stream in the VR format. In the VR format, one VR_MOVIE. A VRO file exists. Reference numeral 231 denotes how the compressed stream looks in the present embodiment, and there are five base files in the present embodiment. Note that 230 and 231 are both viewing the same compressed stream.
[0037]
As shown in the present embodiment, by dividing the compressed stream into small base files and recording, it becomes possible to record on a recording medium with an arbitrary file system without being restricted by a file size or the like. It can be handled by a file system adopted by (personal computer) or the like. Furthermore, since the recording rate is not limited for a recording medium having a high seek speed such as an HDD, the file can be opened and closed at a higher speed.
[0038]
(Embodiment 2)
FIG. 4 is a division information configuration diagram showing division information of an object into a base file in the video signal recording / playback apparatus according to the second embodiment of the present invention, and FIG. 5 is an object division diagram explaining division information related to the object. In FIG. 4, 300 and 310 to 313 are configurations of the entire division information, and 320 to 322 are division information relating to the entire recording medium. “File ID of base file to be recorded next”, “Object to be recorded next” The three types of information “object ID” and “total recorded size of recorded objects” are recorded.
[0039]
Reference numerals 330 to 336 denote division information relating to the object: “object ID of the object”, “total number of base files constituting the object”, “file ID of the first base file constituting the object”, “total record of the object” Seven pieces of information are recorded: “size”, “valid position in the first base file of the object”, “valid position in the final base file of the object”, and “directory in which the object is recorded”.
[0040]
In FIG. 5, reference numeral 400 denotes an object, and 401 to 403 denote base files constituting the object, which are a base file 1, a base file 2, and a base file 3, respectively. Each base file has a unique name. In the present embodiment, the base files are STR0001, STR0002, and STR0003, respectively. The base file name is uniquely determined by the file ID set for each base file. The file IDs in this case are 1, 2, and 3. The file ID increases monotonously within an arbitrary range. The object according to the present embodiment is composed of three base files, and the file name information “STR0001”, “STR0002”, and “STR0003” is necessary as the division information for the object. Each base file can be uniquely determined based on the information “1”, “2”, and “3”.
[0041]
Alternatively, as the division information for the object, “the file ID of the first base file among the base files constituting the object (1 in the present embodiment)” and “the number of base files constituting the object (3 in the present embodiment). Each base file can be uniquely determined by the two pieces of information “)”.
[0042]
As shown in the present embodiment, an increase in division information can be suppressed by dividing and recording a compressed stream into small base files and determining a base file name from a monotonically increasing file ID.
[0043]
(Embodiment 3)
FIG. 5 is an object division diagram illustrating division information related to objects in the video signal recording / reproducing apparatus according to the third embodiment of the present invention. In FIG. 5, reference numeral 400 denotes an object, and 401 to 403 denote base files constituting the object, which are a base file 1, a base file 2, and a base file 3, respectively. Each base file has a unique name. In the present embodiment, the base files are STR0001, STR0002, and STR0003, respectively. The base file name is uniquely determined by the file ID set for each base file. The file IDs in this case are 1, 2, and 3. Reference numeral 410 denotes the position where the object is valid in the STR0001 which is the first base file among the three base files constituting the object, in the size from the first STR0001. Reference numeral 411 denotes a position where the object is valid in the STR0003 which is the final base file among the three base files constituting the object, in a size from the head of the STR0003. In a file system in which partial deletion of a file cannot be performed, a file copy process has occurred when editing such as forward deletion or backward deletion of an object. This causes an increase in processing time and a shortage of recording medium resources.
[0044]
As shown in the present embodiment, the compressed stream is divided into small base files and recorded, and as the division information, the position from the top base file where the object is valid, and the base file constituting the object Having the position from the final base file, which is the final, makes it possible to edit the object without increasing the system load.
[0045]
(Embodiment 4)
FIG. 6 is a file recording method diagram showing a method for recording the division information file and the management information file in the storage medium in the video signal recording / reproducing apparatus of the fourth embodiment of the present invention. In FIG. 6, 500, 503, 504, and 507 are counters, and all have the same value. Reference numerals 501 and 505 denote division information, both of which are the same data. Reference numerals 502 and 506 denote navigation data, both of which are the same data. Reference numeral 510 denotes the recording order of the management information file and the division information file on the recording medium.
[0046]
The operation of the video signal recording / reproducing apparatus of the present embodiment configured as described above will be described.
[0047]
When recording, record according to the following procedure. First, the data in the buffer is flushed. In Linux, sync () is called. Subsequently, the counter 501 is set to STR_DIV. Record in TBL file. Thereafter, the data in the buffer is flushed. Subsequently, the division information 501 is changed to STR_DIV. Record in TBL file. Thereafter, the data in the buffer is flushed. Subsequently, the navigation data 502 is changed to VR_MANGR. Record in IFO file. Subsequently, the counter 501 is set to VR_MANGR. Record in IFO file. Thereafter, the data in the buffer is flushed.
[0048]
Next, the backup file is recorded. First, the data in the buffer is flushed. In Linux, sync () is called. Subsequently, the counter 504 is set to STR_DIV. Record in BUP file. Thereafter, the data in the buffer is flushed. Subsequently, the division information 505 is changed to STR_DIV. Record in BUP file. Thereafter, the data in the buffer is flushed. Subsequently, the navigation data 506 is changed to VR_MANGR. Record in BUP file. Subsequently, the counter 507 is set to VR_MANGR. Record in BUP file. Thereafter, the data in the buffer is flushed.
[0049]
As a result, STR_DIV. TBL and VR_MANGR. For IFO, STR_DIV. The counter recorded at the top of TBL and VR_MANGR. By comparing the counter values recorded behind the IFO, it is possible to determine whether or not the contents of each file have been recorded normally. Similarly, STR_DIV. BUP and VR_MANGR. Also for BUP, STR_DIV. The counter recorded at the top of the BUP and VR_MANGR. By comparing the counter values recorded behind the BUP, it is possible to determine whether or not the contents of each file have been recorded normally.
[0050]
At the time of reproduction, first, STR_DIV. TBL head counter and VR_MANGR. The counter value behind the IFO is compared, and if the two counter values match, STR_DIV. TBL and VR_MANGR. IFO information is used. If they do not match, STR_DIV. BUP head counter and VR_MANGR. The counter value behind BUP is compared, and if the two counter values match, STR_DIV. BUP and VR_MANGR. BUP information is used. If they do not match, the initial value is used.
[0051]
As shown in the present embodiment, it is possible to determine whether or not the recording has been normally performed by adding a counter to the divided file and the management information file.
[0052]
(Embodiment 5)
Hereinafter, a video signal reproducing apparatus according to a fifth embodiment of the present invention will be described with reference to FIG.
[0053]
In this embodiment, encoding section 101 encrypts the compressed stream, but encrypts more bits than the video stream in the audio stream.
[0054]
As a result, an increase in system load can be suppressed, and the compressed stream can be efficiently encrypted.
[0055]
(Embodiment 6)
A video signal recording / reproducing apparatus according to the sixth embodiment of the present invention will be described below with reference to the block diagram of FIG. In FIG. 7, 600 is an input unit, 601 is an encoding unit, 602 is a management information generation unit, 603 is a division information generation unit, 604 is a data recording unit, 605 is a recording medium, 606 is a data reproduction unit, and 607 is decoding. 608 is an output unit, 609 is a PC connected via a network, 610 is a file in the recording medium, and 611 is a file in the recording medium that can be seen from the PC via the network.
[0056]
The operation of the video signal recording / reproducing apparatus of the present embodiment configured as described above will be described.
[0057]
The image signal input from the input unit 600 is input to the encoding unit 601.
[0058]
At the time of recording, the encoding unit 601 performs high-efficiency encoding on the input image and outputs a compressed stream and encoding information. The encoded information is input to the management information generation unit 602 and the division information generation unit 603, and the compressed stream is input to the data recording unit 604.
[0059]
The management information generation unit 602 generates management information from the input encoded information. Management information is input to the recording unit 604.
[0060]
The division information generation unit 603 generates division information for dividing the object into small files called base files from the input encoded information and the recording information input from the data recording unit 604. The division information is input to the data recording unit 604.
[0061]
The data recording unit 604 records the input compressed stream, management information, and division information on the recording medium 605. At this time, a copy stream that can be copied is recorded in a copy-capable directory, and a copy stream that is copy-inhibited is recorded in a copy-prohibited directory. In this embodiment, the copyable directory is dir1, and the copy prohibition directory is dir2. Three objects of object 1, object 2, and object 3 are recorded in dir1, and two objects of object 4 and object 5 are recorded in dir2. For a PC connected via a network, reproduction of a copy-prohibited stream on the PC can be prohibited by not mounting a copy-prohibiting directory.
[0062]
As shown in the present embodiment, by recording a copy-inhibited stream in a copy-inhibiting directory and making the directory invisible to a network-connected PC, copyright protection can be achieved.
[0063]
【The invention's effect】
The video signal recording / reproducing method and the video signal recording / reproducing apparatus of the present invention divide and record the compressed stream into small base files, so that the recording can be performed on the recording medium with any file system without being limited by the file size or the like. It becomes possible to do. In addition, files can be opened and closed faster.
[0064]
In addition, by dividing the compressed stream into small base files and recording them, and determining the base file name from the file ID that monotonously increases, it is possible to suppress an increase in the division information.
[0065]
Further, the system load is increased by having the position from the first base file where the object is valid as the division information and the position from the final base file that is the last of the base files constituting the object. The object can be edited without any problem.
[0066]
Further, by adding a counter to the divided file and the management information file, it is possible to determine whether or not the recording has been normally performed.
[0067]
In addition, by encrypting more bits in the audio stream than in the video stream, it is possible to suppress an increase in system load and efficiently encrypt the compressed stream.
[0068]
Further, by recording the copy-inhibited stream in the copy-inhibiting directory and making the directory invisible from the PC connected to the network, the copyright can be protected.
[Brief description of the drawings]
FIG. 1 is a block diagram of a video signal recording / reproducing apparatus according to first and fifth embodiments of the present invention.
FIG. 2 is a data structure diagram of the video signal recording / reproducing apparatus according to the first embodiment of the present invention.
FIG. 3 is a stream structure comparison diagram showing the difference in appearance between the conventional system and the compressed stream of the present invention.
FIG. 4 is a division information configuration diagram showing division information of an object into a base file in the video signal recording / playback apparatus according to the second embodiment of the present invention;
FIG. 5 is an object division diagram illustrating division information related to objects in the video signal recording / playback apparatus according to the second embodiment of the present invention;
FIG. 6 is a file recording method diagram showing a recording method of a management information file and a division information file in a video signal recording / reproducing apparatus according to a fourth embodiment of the present invention;
FIG. 7 is a block diagram of a video signal recording / reproducing apparatus according to a sixth embodiment of the present invention.
FIG. 8 is a block diagram of a conventional video signal recording / reproducing apparatus.
FIG. 9 is a data structure diagram of management information of a conventional DVD disc.
[Explanation of symbols]
100, 600 input section
101, 601 encoding unit
102, 602 Management information generation unit
103, 603 Division information generation unit
104, 604 Data recording unit
105, 605 recording medium
106,606 Data reproduction unit
107, 607 Decoding unit
108,608 Output unit
110 VR_MANGR. IFO (navigation data file)
111 VR_MOVIE. VRO (video data)
112 VR_STILL. VRO (still image data)
113 VR_AUDIO. VRO (voice data)
114 VR_MANGR. BUP (backup of navigation data file)
115 STR_DIV. TBL (information for dividing objects into base files)
116 STR_DIV. BUP (Backup of division information to object base file)
200 All compressed streams recorded on the recording medium
210, 211 Objects recorded on the recording medium
220, 221, 222 Base files that make up object 1
223, 224 Base file composing object 2
230 How the compressed stream looks in the VR format
231 How the compressed stream looks in the present invention
300 Dividing information of objects into base files
310 Total division information
311 Object 1 division information
312 Object 2 division information
313 Division information of object n
320, 321, 322, 330, 331, 332, 333, 334, 335, 336 Division information
400 objects
401, 402, 403 Base files that make up an object
410 Position from the beginning of the first base file where the object is valid
411 Position from the beginning of the last base file where the object is valid
500, 503, 504, 507 counter
501 and 505 Information on dividing objects into base files
502, 506 Navigation data
510 Recording order of management information file and division information file
609 PC connected via network
610 Directory structure in the present invention
611 Directory visible from PC

Claims (2)

An encoding unit that compresses an input video signal and generates a compressed stream;
A management information generating unit that generates management information from the video signal and the compressed stream;
A division information generation unit that generates division information for dividing an object that is a basic unit of a program into a base file that is a basic unit of recording on a recording medium;
A recording unit for recording the management information and the division information and the compressed stream on the recording medium based on the division information,
A playback unit for acquiring the compressed stream, the management information, and the division information recorded in the recording medium;
The compressed stream, the management information, and a decoding unit which performs a reproduction process by the division information,
The recording unit prepares a first division information file and a second division information file as recording files for the division information, and records the division information in the first division information file. All the data in the buffer, followed by recording a counter, subsequently writing all the data in the buffer, then writing the division information, then recording the counter, and writing the counter to the second division information file. In recording the division information, all the data in the buffer is written, and then the counter is recorded, then all the data in the buffer is written, then the division information is written, and then the counter is recorded,
The video signal recording / reproducing apparatus , wherein the reproduction unit compares the value of the counter when reading the division information and determines a division information file to be read . A video signal recording / reproducing apparatus that performs compression processing on an input video signal to generate a compressed stream, and records the compressed stream on a recording medium, wherein the compressed stream is reproduced by an information processing apparatus or the like via a network in, an object that is a copy inhibition, was recorded at different copy inhibition directory is that it is possible to duplicate object, the copy inhibition directory, according to claim 1, wherein the no mounting process in the network Video signal recording / playback device.

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