CN104991746A - Method and system for storing and reading record data in FAT hard disk - Google Patents
Method and system for storing and reading record data in FAT hard disk Download PDFInfo
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Abstract
The present invention discloses a method and system for storing and reading record data in an FAT hard disk. The method comprises the following steps of: formatting the hard disk, clearing data of a sector management table 1, a sector management table 2, a root directory management table in each sector of the hard disk, and dividing each data area into a plurality of data blocks with fixed sizes and an index block; receiving raw data, calling an ATA protocol, storing the raw data into the data blocks with the fixed sizes, meanwhile storing acquired key frame information into the index block, and completing a data storage process; acquiring a corresponding data block from the index block according to a transfer channel and time information, and reading corresponding key frame information from the corresponding data block; matching a time stamp in need of reading data with the time stamp of a key frame; and positioning a location of the key frame, and completing a data reading process. According to the method and system for storing and reading the record data in the FAT hard disk, fast storage and reading of high-resolution image data can be effectively improved.
Description
Technical field
The invention belongs to technical field of security and protection, particularly a kind of method and system storing and read Video data in FAT hard disk.
Background technology
Network hard disk video recorder (network video recorder, NVR) the digital of digital video data frame for being transmitted by network reception web camera, and carry out store and management.Along with security protection industry develops rapidly, the function of NVR is being enriched constantly, and as local multi-screen preview, multiple terminals program request etc. require more and more higher to image effect simultaneously, image data amount is increasing.
FAT32 have employed the file allocation table of 32, the ability of management hard disk is able to great raising, breach FAT16 easily and quantitative limitation is held to disk partition, reach record-breaking 2000GB, thus make us no matter use great hard disk they can be defined as a subregion, be very easy to the integrated management of users to disk.The more important thing is, under a subregion is no more than the prerequisite of 8GB, the capacity of FAT32 subregion each bunch is fixed as 4KB, and this is just little than FAT16 many, thus makes the utilization factor of disk be able to great raising.As being the disk partition of that 2G above equally, after adopting FAT32, its size of each bunch has become 4K, and this reduces to 2K with regard to making average the wasted disk space of each file, suppose in store 20480 files on hard disk, then the disk space wasted is 20480*2/1024=40M.Will waste 320M for one, another one only wastes 40M, and the height of the efficiency of FAT32 is seen some from this.
Certainly, FAT32 is also perfect in every way by no means, it also has some intrinsic shortcomings: first, the compatibility of FAT32 is not so good, Windows 97,98 and Windows 2000 is only had to support FAT32 at present, other operating systems (as DOS, Linux etc.) do not support FAT32, and this just have impact on the interchange of user data; Secondly, due to the expansion of file allocation table, make the disk travelling speed of FAT32 comparatively speaking comparatively FAT16 want slow (reflect under Windows graphical interfaces and not obvious, but larger gap will be showed under safe mode and MS-DOS state); Three: FAT32 revises system in some disk operating mode, thus our some conventional disk operation can not be proceeded (as FAT32 does not support DoubleSpace, the disc handler etc. that we can not compress, can not those be used in FAT32 old-fashioned the subregion of employing FAT32).The user of particular/special requirement (using the user of DOS as also needed while using Windows 98) is had definitely easily all disk partition can not to be all converted to FAT32 form.
At present, in order to meet the high performance requirements of NVR, need to distribute a kernel to each function of NVR, the file system that linux carries can not solve quick storage and the reading of large image in different resolution very well, this not only expends a large amount of internal memories of NVR, and brings very large difficulty in storage and reading data.Visible, the overall performance of NVR is lower.
Summary of the invention
The present invention solves prior art to solve quick storage and the reading of large image in different resolution very well, provides a kind of method and system storing and read Video data in FAT hard disk, can quick storage and read large resolution data, improves the overall performance of NVR.
The technical solution adopted in the present invention is:
A kind of method storing and read Video data in FAT hard disk, described hard disk partition is 4 districts, respectively: boot section, the first subregion, the second subregion, the 3rd subregion, described boot section is divided into three parts: boot sector, boot section backup, trough, four parts are divided into for first point: sector management table 1, sector management table 2, root directory admin table, data field in described hard disk, second subregion and the 3rd subregion are equal to the first subregion, and the concrete method storing and read data comprises the steps:
The first step, formatting hard disk, by sector admin table 1, sector management table 2, root directory admin table zeros data in the first subregion, the second subregion, the 3rd subregion in hard disk, in the root directory management of the first subregion, the second subregion, the 3rd subregion, data field is assigned as data block and an index block of multiple fixed size;
Second step, receives raw data, calls ATA agreement, by raw data stored in the data block of fixed size, simultaneously by obtain key frame information stored in index block, the key frame information in all data blocks of index block record current bay, completes data storage procedure;
3rd step, obtains corresponding data block according to the passage imported into and temporal information from index block, reads corresponding key frame information from corresponding data block;
4th step, matches the timestamp and key frame timestamp that need reading data;
5th step, navigates to key frame position, completes reading data procedures.
The concrete steps of described formatting hard disk are:
A. first sector of hard disk is rewritten, the subregion initial sector of recording disk, zone attribute information;
B. first sector of subregion is rewritten, record partitioning initial sector, sector management table 1 initial sector, root directory admin table initial sector information;
C. sector management table 1, sector management table 2, root directory admin table are reset;
D. write verification file, judge that this hard disk formats, can normally use;
E. data block and index block is distributed.
Sector management table 1 and sector management table 2 just distribute when disk format, is that under can avoiding abnormal ending, sector admin table is abnormal in order to ensure removing amendment sector management table when recording a video, distributing sector management table after format.
Described reception raw data, call ATA agreement, by raw data stored in the data block of fixed size, simultaneously by obtain key frame information stored in index block time, ATA agreement obtains the beginning sector of data block and data block size by root directory admin table, calculate store or load position relative to the absolute sector number of hard disk sector.
By raw data stored in before in the data block of fixed size, described method also comprises:
Judge that this raw data is stored in position+stored in data length≤data block size;
If described raw data is stored in position+stored in data length≤data block size, adds this raw data attribute, data time stamp, data length, and by raw data stored in data block, be convenient to the abundant use of individual data block.
Store and read a system for Video data in FAT hard disk, described system comprises as lower module:
Hard disk processing module, by sector admin table 1, sector management table 2, root directory admin table zeros data in the first subregion, the second subregion, the 3rd subregion in hard disk, in the root directory management of the first subregion, the second subregion, the 3rd subregion, data field is assigned as data block and an index block of multiple fixed size;
Data reception module, for calling ATA agreement, by raw data stored in the data block of fixed size, simultaneously by obtain key frame information stored in index block; Key frame information in all data blocks of index block record current bay;
Data read module, for obtaining corresponding data block according to the passage imported into and temporal information from index block, read corresponding key frame information from corresponding data block, the timestamp and key frame timestamp that need reading data are matched, navigate to key frame position, read data.
Index block size in described hard disk processing module calculates according to code check 256Kbps, and index block size is:
4096+ (data block size/(256*1024/8) * crucial hardwood information size+1024) this subregion total data number of blocks of *.
Described index block is divided into reserved area and storage area, and described reserved area size is 4KB, and described storage area is divided into data critical frame information storage area in multiple data block.
Described raw data is web camera data frame information or camera data frame information, and raw data size is >=32KB.
Described hard disk is 7200 revolutions per seconds and above high speed hard-disk.
The beneficial effect that the present invention produces is: directly call ATA agreement, send the order of SCSI universal driver by ioctl store or read data, skip linux and carry file system to the storage of data and reading, >=the raw data of 32KB can be stored and read, the quick storage of the large image in different resolution of fine solution and reading, improve the overall performance of NVR, thus raise the efficiency.
Accompanying drawing illustrates:
Fig. 1: a kind of method flow schematic diagram storing and read Video data in FAT hard disk of the present invention;
Fig. 2: open a kind of storage and reading FAT fdisk structural representation in the embodiment of the present invention;
Fig. 3: open a kind of storage and reading FAT hard disk first partitioned organization schematic diagram in the embodiment of the present invention;
Fig. 4: disclose index block partitioned organization schematic diagram in the system of Video data in a kind of storage and reading FAT hard disk in the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment one
A kind of method storing and read Video data in FAT hard disk of the present invention, first be 4 districts by the hard disk partition in network hard disk video recorder, respectively: boot section 1, first subregion 2, second subregion 3, the 3rd subregion 4, wherein boot section 1 is divided into three parts: boot sector 101, boot section backup 102, trough 103, wherein boot sector 101, essential record hard disk has the type of several subregion, each subregion start-stop sector, each subregion; Boot section backup 102, for backup and recovery hard disk boot section, for data protection and prevention and cure of viruses; Trough 103 is for Data expansion.
In hard disk, the first subregion 2 is divided into again 4 parts: 201 for sector management table 1,202 for sector management table 2, root directory admin table 203, data field 204,201 sector management tables 1, for record this sector whether by with, whether can use, 201 sector management table 1 sizes can carry out dynamic conditioning according to number of sectors; Next be 202 sector management tables 2, for backup, under preventing abnormal conditions, data are normally recovered; Root directory admin table 203, for information such as recording data blocks size, data block initial sector, data block type, root directory admin table 203 Section 1 is verification file, and Section 2 is subregion index file; Data field 204, the storage of Video data and to read be all operate in this region, whether each data field 204 starts sector and is the first bunch and deposits verification file, for differentiating this hard disk software format.Second subregion and the 3rd subregion are equal to the first subregion.
The method of concrete storage and reading data comprises the steps:
First step S101, formatting hard disk, by 201 sector management tables 1,202 sector management tables 2, root directory admin table 203 zeros data in the first subregion 2, second subregion 3, the 3rd subregion 4 in hard disk, in the root directory management of the first subregion 2, second subregion 3, the 3rd subregion 4, data field 204 is assigned as data block and an index block of multiple fixed size
Described formatting hard disk process is:
A. first sector of hard disk is rewritten, the subregion initial sector of recording disk, zone attribute information;
B. first sector of subregion is rewritten, record partitioning initial sector, 201 sector management table 1 initial sectors, root directory admin table 203 initial sector information;
C. 201 sector management tables 1,202 sector management tables 2,203 root directory admin tables are reset;
D. write verification file, judge that this hard disk formats, can normally use;
E. data block and index block is distributed,
201 sector management tables 1 and 202 sector management tables 2 just distribute when disk format, in order to ensure removing amendment sector management table when recording a video, distribute sector management table after format, under can avoiding abnormal ending, sector admin table is abnormal
Second step S102, receives raw data, calls ATA agreement, by raw data stored in the data block of fixed size, simultaneously by obtain key frame information stored in index block, the key frame information in all data blocks of index block record current bay, completes data storage procedure;
3rd step S103, obtains corresponding data block according to the passage imported into and temporal information from index block, reads corresponding key frame information from corresponding data block;
4th step S104, matches the timestamp and key frame timestamp that need reading data;
5th step S105, navigates to key frame position, completes reading data procedures.
Described reception raw data, call ATA agreement, by raw data stored in the data block of fixed size, simultaneously by obtain key frame information stored in index block time, ATA agreement obtains the beginning sector of data block and data block size by root directory admin table, calculate store or load position relative to the absolute sector number of hard disk sector.
By raw data stored in before in the data block of fixed size, described method also comprises:
Judge that this raw data is stored in position+stored in data length≤data block size;
If described raw data is stored in position+stored in data length≤data block size, adds this raw data attribute, data time stamp, data length, and by raw data stored in data block, be convenient to the abundant use of individual data block.
Store and read a system for Video data in FAT hard disk, described system comprises as lower module:
Hard disk processing module, by 201 sector management tables 1,202 sector management tables 2, root directory admin table 203 zeros data in the first subregion 2, second subregion 3, the 3rd subregion 4 in hard disk, in the root directory management of the first subregion 2, second subregion 3, the 3rd subregion 4, data field 204 is assigned as data block and an index block of multiple fixed size;
Data reception module, for calling ATA agreement, by raw data stored in the data block of fixed size, simultaneously by obtain key frame information stored in index block; Key frame information in all data blocks of index block record current bay;
Data read module, for obtaining corresponding data block according to the passage imported into and temporal information from index block, read corresponding key frame information from corresponding data block, the timestamp and key frame timestamp that need reading data are matched, navigate to key frame position, read data.
Index block size in described hard disk processing module calculates according to code check 256Kbps, and index block size is:
4096+ (data block size/(256*1024/8) * crucial hardwood information size+1024) this subregion total data number of blocks of *, to be convenient in the abundant use of hard-disk capacity and use procedure power-off to the destruction of whole data block.
Described index block is divided into reserved area 2041 and storage area, described reserved area size is 4KB, and described storage area to be divided in the first data block in data critical frame information storage area 2042, second data block data critical frame information storage area etc. multiple storage areas such as storage area 2044 in data critical frame information storage area the 2043, the 3rd data block.
Described raw data is web camera data frame information or camera data frame information, and raw data size is >=32KB.
Described hard disk is 7200 revolutions per seconds and above high speed hard-disk.
A kind of method and system storing and read Video data in FAT hard disk of the present invention, adopt ata command directly to hard-disc storage and reading, open data block, SCSI is sent by ioctl, store through drive command (hard disk is ATA agreement) or read data, directly skip linux and carry file system to the storage of data and reading, can read-out resolution be the large view data of 1080*1920, thus raise the efficiency.
These are only preferred embodiment of the present invention; do not address part herein and be suitable for the present invention equally; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the method storing and read Video data in FAT hard disk, it is characterized in that: described hard disk partition is 4 districts: boot section, the first subregion, the second subregion, the 3rd subregion, described boot section is divided into three parts: boot sector, boot section backup, trough, four parts are divided into for first point: sector management table 1, sector management table 2, root directory admin table, data field in described hard disk, second subregion and the 3rd subregion are equal to the first subregion, and the concrete method storing and read data comprises the steps:
The first step, formatting hard disk, by sector admin table 1, sector management table 2, root directory admin table zeros data in the first subregion, the second subregion, the 3rd subregion in hard disk, in the root directory management of the first subregion, the second subregion, the 3rd subregion, data field is assigned as data block and an index block of multiple fixed size;
Second step, receives raw data, calls ATA agreement, by raw data stored in the data block of fixed size, simultaneously by obtain key frame information stored in index block, the key frame information in all data blocks of index block record current bay, completes data storage procedure;
3rd step, obtains corresponding data block according to the passage imported into and temporal information from index block, reads corresponding key frame information from corresponding data block;
4th step, matches the timestamp and key frame timestamp that need reading data;
5th step, navigates to key frame position, completes reading data procedures.
2. storage according to claim 1 and read the method for Video data in FAT hard disk, is characterized in that: the concrete steps of described formatting hard disk are:
A. first sector of hard disk is rewritten, the subregion initial sector of recording disk, zone attribute information;
B. first sector of subregion is rewritten, record partitioning initial sector, sector management table 1 initial sector, root directory admin table initial sector information;
C. sector management table 1, sector management table 2, root directory admin table are reset;
D. write verification file, judge that this hard disk formats, can normally use;
E. data block and index block is distributed.
3. storage according to claim 1 and read the method for Video data in FAT hard disk, it is characterized in that: described reception raw data, call ATA agreement, by raw data stored in the data block of fixed size, simultaneously by obtain key frame information stored in index block time, ATA agreement obtains the beginning sector of data block and data block size by root directory admin table, calculate store or load position relative to the absolute sector number of hard disk sector.
4. storage according to claim 1 and read the method for Video data in FAT hard disk, is characterized in that: by raw data stored in before in the data block of fixed size, described method also comprises:
Judge that this raw data is stored in position+stored in data length≤data block size;
If described raw data is stored in position+stored in data length≤data block size, add this raw data attribute, data time stamp, data length, and by raw data stored in data block.
5. store and read a system for Video data in FAT hard disk, described system comprises as lower module:
Hard disk processing module, by sector admin table 1, sector management table 2, root directory admin table zeros data in the first subregion, the second subregion, the 3rd subregion in hard disk, in the root directory management of the first subregion, the second subregion, the 3rd subregion, data field is assigned as data block and an index block of multiple fixed size;
Data reception module, for calling ATA agreement, by raw data stored in the data block of fixed size, simultaneously by obtain key frame information stored in index block; Key frame information in all data blocks of index block record current bay;
Data read module, for obtaining corresponding data block according to the passage imported into and temporal information from index block, read corresponding key frame information from corresponding data block, the timestamp and key frame timestamp that need reading data are matched, navigate to key frame position, read data.
6. store and read the system of Video data in FAT hard disk according to claim 5, it is characterized in that: the index block size in described hard disk processing module calculates according to code check 256Kbps, and index block size is:
4096+ (data block size/(256*1024/8) * crucial hardwood information size+1024) this subregion total data number of blocks of *.
7. store and read the system of Video data in FAT hard disk according to claim 5, it is characterized in that: described index block is divided into reserved area and storage area, described reserved area size is 4KB, and described storage area is divided into data critical frame information storage area in multiple data block.
8. store and read the system of Video data in FAT hard disk according to claim 5, it is characterized in that: described raw data is web camera data frame information or camera data frame information, and raw data size is >=32KB.
9. store and read the system of Video data in FAT hard disk according to claim 5, it is characterized in that: described hard disk is 7200 revolutions per seconds and above high speed hard-disk.
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| CN109874049A (en) * | 2019-01-23 | 2019-06-11 | 杭州雄迈集成电路技术有限公司 | A method of video frame reading speed is extracted in optimization |
| CN112667171A (en) * | 2021-01-14 | 2021-04-16 | 武汉极目智能技术有限公司 | Circular coverage file system based on disk naked writing and read-write method |
| CN112702550A (en) * | 2020-12-21 | 2021-04-23 | 上海商米科技集团股份有限公司 | NVR multi-process audio and video stream sharing system and implementation method |
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Application publication date: 20151021 |