CN104268088B

CN104268088B - Vehicle-mounted DVR hard disc data storage method

Info

Publication number: CN104268088B
Application number: CN201410467649.4A
Authority: CN
Inventors: 郭建国; 刘华涵; 刘阳忠; 李永康
Original assignee: ZHENGZHOU TIANMAI TECHNOLOGY Co Ltd
Current assignee: ZHENGZHOU TIANMAI TECHNOLOGY Co Ltd
Priority date: 2014-09-15
Filing date: 2014-09-15
Publication date: 2018-11-16
Anticipated expiration: 2034-09-15
Also published as: CN104268088A

Abstract

The invention discloses a kind of vehicle-mounted DVR hard disc data storage methods, step 1, the available storage area of vehicle-mounted DVR hard disk are divided into the file partition ext3 and without file partition；Step 2, video file is acquired, and collected video file is divided into index file and the corresponding video data two parts of index file；Step 3, index file is stored in the file partition ext3；The corresponding video data of index file is stored in no file partition in chronological order；Step 4, circulation covers after no file partition memory space is full, and corresponding index file is also covered by circulation in the file partition ext3.The present invention uses the storage method without file system, both ensure that the operation to disk few as far as possible, the convenience in turn ensuring data storage and reading, increase memory capacity, reduce the amount of access to hard disk, reduce the spoilage of hard disk, reduces the maintenance cost in later period.

Description

Vehicle-mounted DVR hard disc data storage method

Technical field

The present invention relates to a kind of date storage methods, more particularly, to a kind of vehicle-mounted DVR hard disc data storage method.

Background technique

Existing vehicle-mounted DVR（Digital video recorder）Storage method mainly has following three kinds：1, it is stored, is lacked using SD card Point is that capacity is smaller, and read or write speed is not fast enough, and unexpected power down is easily damaged, and advantage is not to be afraid of the environment that jolts.2, using SSD（Gu State hard disk）Storage, advantage is that capacity is larger, and read or write speed is fast, is not afraid of and jolts, but price is costly, increases product cost.3, It is stored using traditional mechanical hard disk, using caching（Caching uses the storage medium without mechanical part）, i.e., when in the environment that jolts When deposit caching, data are transferred to hard disk again when steady.The advantages of this method be solve memory capacity, storage speed and The problems such as cost, the disadvantage is that data are managed using special file system on hard disk, because increasing there are file system to hard The workload of disk read-write, hard disk must not be without the data of many corresponding maintaining file systems when storing DVR data Read-write, considerably increases hard disk operational amount.Because spatial cache is limited, it cannot be guaranteed that the hard disk only stores always number when steady According to when caching will be full, hard disk must be written and read by being unable to satisfy hard-disc storage requires even if road environment.It is running Winnowing with a dustpan, the amount being written and read to hard disk under environment is more, and hard disk is more easily damaged, and one piece of hard disk price is not cheap, can increase in this way Add later maintenance cost.

Summary of the invention

In view of this, increasing storage the object of the present invention is to provide a kind of vehicle-mounted DVR hard disc data storage method and holding Amount, reduces the amount of access to hard disk, reduces the spoilage of hard disk, reduce the maintenance cost in later period.

In order to achieve the above objectives, the present invention uses following technical scheme：

A kind of vehicle-mounted DVR hard disc data storage method, wherein include the following steps：

Step 1, the available storage area of vehicle-mounted DVR hard disk is divided into the file partition ext3 and without file partition；

Step 2, video file is acquired, and collected video file is divided into index file and the corresponding view of index file Frequency is according to two parts；Index file and video data are one-corresponding relationships；

Step 3, index file is stored in the file partition ext3；Temporally by the corresponding video data of index file It is stored sequentially in no file partition；

Step 4, circulation covers after no file partition memory space is full, corresponding rope in the file partition ext3 Quotation part is also covered by circulation.

The beneficial effects of the invention are as follows：

For vehicle-mounted DVR, the data of storage are all some video stream datas, are that storage is some trivial unlike being normally applied Broken small documents, therefore not high to file system demand degree, and there are if file system, to the pipe of file system on disk Reason operation also will increase the amount of access to hard disk, and increases hard disk amount of access under the environment that jolts on bus and also mean that The probability for increasing hard disk corruptions increases the maintenance cost in later period.The present invention uses the storage method without file system, both protects The operation to disk few as far as possible is demonstrate,proved, the convenience in turn ensuring data storage and reading.

Detailed description of the invention

Fig. 1 is flow chart of the method for the present invention；

Fig. 2 is index file and the corresponding schematic diagram of video data in hard-disc storage area of the present invention.

Specific embodiment

The invention will be further described with reference to the accompanying drawings and examples.

File system is operating system for clearly storing the method and data structure of equipment or the file on subregion；Exist The method for storing constituent act in equipment.File system consists of three parts：Software related with file management, be managed file with And data structure needed for implementing file management.From the point of view of system perspective, file system is carried out to the space of file-storage device The system that file stores and the file of deposit is protected and retrieved is responsible in tissue and distribution.Specifically, it is responsible for using File is established at family, and deposit is read, modification, dump file, controls the access of file, file is cancelled when user does not use.

If one piece of empty hard disk is regarded as a blank sheet of paper, file system exactly draws table on this blank sheet of paper, such as Financial table, personal information table etc. are divided into the differentiation of different table i.e. different file system, such as on USB flash disk Common FAT32 file system, the new technology file system on hard disk since being to draw a table, be certainly can occupy it is certain hard Disc storage space, but also need to carry out to manage operation accordingly, which adds the operating quantity to hard disk.

Of the invention is hard disk to be regarded as an end to end tape without file system data storage method, can be followed Data are written in ring cover, and each storage location has a corresponding coordinate, which is the address of the position, video data It once writes direct and does not need the nuisance operations such as maintaining file system.No file system is of course not said does not save file completely Relevant information, in this way to reading data when will cause larger difficulty, to solve this problem, can retain in hard disk initial position One block message memory block saves some specific informations, such as data head, data tail, time etc. some key messages of overall importance. In the DVR data of preservation（Video data）When, every piece of beginning can simply save some video datas, such as data block sequence number, Timestamp, video channel number etc., moreover, index text that under normal circumstances can directly by being established in the file partition ext3 Part quickly positions required video data.

As shown in Figure 1, of the invention includes the following steps：

Step 4, circulation covers after no file partition memory space is full, corresponding rope in the file partition ext3 Quotation part is also covered by circulation.Index file and be one-to-one, no file system without the video data in file partition System subregion will do it circulation covering because data volume is bigger, and the index file of the file partition ext3 is according to no file system Subregion corresponds to the presence of video data and exists, circulation covering, ext3 file system after no file partition memory space is full Corresponding index file is also covered by circulation in system subregion.

In video data write-in, the ext3 subregion of a fritter is marked off on vehicle-mounted DVR hard disk to store index file, Index file small one by one is created according to temporal information, is recorded the initial address of the video data at corresponding moment, is terminated ground Location, data tail, the time, is the data acquired from which camera etc. relevant information at data head, because only writing one simply Index, the data volume very little of write-in, to entire effect very little, and because index file is more trifling and to data accuracy It is required that it is relatively high, so needing to establish on the storage medium for having file system, it is typically chosen ext3 file system, this article Part system can be relatively good guarantee the index data accuracy.And easy-to-look-up read-write index file.At regular intervals It is created that an index file, guarantees the continuity that data save, and hard disk can easily be managed according to these index files In the video data stored, and video data can recycle covering.Because ext3 partitions of file only saves index file, write-in Data volume very little, subregion is smaller, and no file partition is because video data will be stored, and the space needed is very big, hard disk Subregion largely distributes to no file partition.

Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common Other modifications or equivalent replacement that technical staff makes technical solution of the present invention, without departing from technical solution of the present invention Spirit and scope, be intended to be within the scope of the claims of the invention.

Claims

1. a kind of vehicle-mounted DVR hard disc data storage method, it is characterised in that：Include the following steps：

Step 2, video file is acquired, and collected video file is divided into index file and the corresponding video counts of index file According to two parts；Index file and video data are one-corresponding relationships；

Step 3, index file is stored in the file partition ext3；In chronological order by the corresponding video data of index file It is stored in no file partition；

In video data write-in, the ext3 subregion of a fritter is marked off on vehicle-mounted DVR hard disk to store index file, according to Temporal information creates index file small one by one, records initial address, the end address, number of the video data at corresponding moment According to head, data tail, the time, be the data association message acquired from which camera；It is created that an index at regular intervals File, guarantees the continuity of data preservation, and the video data stored in hard disk is easily managed according to these index files, and And video data circulation covering；

Step 4, expire rear video datacycle when no file partition memory space to cover, it is corresponding in the file partition ext3 Index file also by circulation cover.