CN102096698B - Video data storage format, storage method and search method - Google Patents
Video data storage format, storage method and search method Download PDFInfo
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Abstract
The invention discloses a video data storage format, a video data storage method and a video data search method. The storage format is that: a logical volume in a memory is divided into two types, namely an equipment head and a plurality of pages, wherein the equipment head stores related information of the pages; the related information comprises a current page field and a current offset field into which video data is written; each page is divided into two parts, namely a page head and at least one data block, wherein the page head comprises a start time field when the video data is stored into the page; and each data block is divided into two parts, namely a block head and a real video data storage area, wherein the block head comprises a data block size field and a time offset field opposite to the page head. Received video data is directly stored into a raw device based on the storage method disclosed by the storage format, disk fragmentation can be reduced, and search efficiency can be improved. In addition, the video data takes data blocks as units, is stored in the pages of each logical volume, is convenient to manage and has high data access performance.
Description
Technical field
The invention belongs to technical field of video monitoring, specifically, relate to a kind of video data storage format, and based on the date storage method and the data retrieval method of this data memory format design.
Background technology
Video storage is the key component of video monitoring system with retrieval, and monitoring trade adopts the DVR digital video recorder to carry out data storage through embedded hard disk more at present.But along with the scale and the scope of video monitoring system enlarges gradually, the various shortcoming of DVR data storage method also obviously comes out---the hard disk corruptions rate is high; No RAID (Redundant Array of Independent Disk raid-array) protection; Loss of data can't recover; Memory capacity is little; Sharpness is not high; Can't unified management etc.In contrast; IP SAN (SAN Storage Area Network, storage area network) data storage method with high-performance, high reliability, advantage such as can expand, agreed with safety monitoring data storage Development Trend; Overcome the many disadvantages of DVR, optimized the video monitoring storage system.
Traditional I P SAN data storage method needs at first to create file system for disk partition before the video data storage, then recorded video data is stored with the form of file.Therefore this data storage method is easy to generate disk fragments because the existence of file system is arranged, and can't promptly deposit promptly and get, thereby cause access performance not high, and recall precision is low, and its video index data also are not easy to management.These problems cause the whole video supervisory system unstable easily, and the data retrieval inefficiency.
Summary of the invention
The present invention is easy to generate the not high problem of disk fragments and memory property and recall precision in order to solve in the IP SAN storing process, proposed a kind of brand-new video data storage mode, with the generation of minimizing disk fragments, and improves storage efficiency.
For solving the problems of the technologies described above, the present invention has at first carried out following design to the video data storage format:
Storage management program is carried out initialization to each video camera corresponding logical volume in storer; It is divided into two big types: a device head and several pages or leaves; Wherein, Deposit the relevant information of page or leaf in the device head, comprise current page field Current_no and current offset field offset that video data is write; Each page or leaf is divided into two parts again: a top margin and at least one data block; Wherein, Include the start time field time that video data deposits this page in the top margin; Each data block is divided into two parts again: build and real video data memory block Video data wherein, comprise the size field Size of data block and the time offset field Time_offset of relative top margin in the build.
Further, in said top margin, also include whether information available field Use flag of this page or leaf, be used for this page or leaf of sign and whether be used.
Further again, in said build, also include the beginning unique identification field Magic_start of data block and finish unique identification field Magic_end; The value of non-regulation in said beginning unique identification field Magic_start and/or end unique identification field Magic_end, occurred, thought that then this data block is a bad piece.
Further again, in said device head, also include total digital section Total_no and camera number field Carema_id of page or leaf, be respectively applied for and deposit total page number and the pairing camera number of this logical volume that this device head belongs to logical volume.
Based on above-mentioned video data storage format, the present invention provides a kind of video data storage method again, comprises following process:
A, after storage management program receives video code flow, will be written to the current time in the time field of top margin;
B, the sequence number of current page is written in the Current_no field of device head;
C, the time offset of the relative top margin of preserving in the current data block of video data is written in the Time_offset field of build;
D, the video data that receives is deposited in the Video_data memory block of current data block;
E, after arriving official hour, the size of current data block is written in the Size field of build in the current data block, and in the offset of device head field, writes the side-play amount of current storage pointer in logical volume;
F, beginning renew the video data that storage receives at next data block relaying, and return course c continues to carry out;
G, after current page has been write, open one page down, continue to carry out described process a to f.
Further, in said process a, also comprise with this page in the top margin whether the value among the information available field Use flag be revised as with the process of sign, represent that this page or leaf is used.
Further again, in said process c, also be included in the beginning unique identification field Magic_start and the process that finishes to write among the unique identification field Magic_end setting of current data block, the video data in the expression current data block is effective.
Further again, for last discontinuous two sections video code flows of time, when back one section video code flow is stored, the side-play amount that at first writes down in the offset field of fetch equipment head, the pointer position when obtaining the end of storage video code flow the last period; Then memory pointer is pointed to a back data block of said pointer position, begun back one section video code flow is carried out the block-by-block storage from said data block.
Based on above-mentioned video data storage format, the present invention provides a kind of video data search method again, comprises following process:
A, concordance program are set up concordance list in storer, a corresponding master index table of video camera and a secondary index table; Wherein, preserve video index information in the master index table, comprise start time, the side-play amount of video data in logical volume and the page or leaf at video data place of video data; The secondary index table is preserved discontinuous index information, comprises the side-play amount of video data in logical volume in start time and the next data block of video data in side-play amount in logical volume of video data in the start time of video data in the data block, the last data block, the next data block;
B, concordance program periodic polling logical volume; When new data block; Calculate start time, the video data side-play amount in logical volume and the page or leaf at video data place of the video data of depositing in this data block according to information recorded in the data block, record in the concordance list;
C, when the video data of preserving is retrieved, the two-stage retrieving below search program is carried out:
One-level retrieval:, in the master index table, retrieve the time of the beginning index in said start time and concluding time scope and the time of end index according to the retrieval start time and the concluding time of input;
2-level search: time and the time that finishes index according to described beginning index, in the secondary index table, retrieve the pairing data block of each section continuous video data, and read the video data in the respective data blocks, accomplish retrieving.
Further, in said process A, the discontinuous index information that the secondary index table is preserved comprises the last discontinuous index information different with logical volume of time; The index information that in the secondary index table, also comprises video data place logical volume name in the next data block.
Compared with prior art; Advantage of the present invention and good effect are: video data storage mode of the present invention directly writes the video data that receives in the raw device that does not have file system; Thereby can reduce the generation of disk fragments, improve memory property and recall precision.Video data adopts the method for promptly looking into of promptly writing, and can not postpone by time of occurrence.In addition, video data is a unit with the data block, is stored in the page or leaf of each logical volume, be convenient to management, and the data access performance improves.Through regular update concordance list in the video data storage, and adopt the method for B-tree to retrieve, thereby accelerated the response time, promoted recall precision.
After the detailed description in conjunction with the advantages embodiment of the present invention, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the configuration diagram of video data storage format proposed by the invention;
Fig. 2 is the process flow diagram of video data search method proposed by the invention.
Embodiment
Describe in detail below in conjunction with the accompanying drawing specific embodiments of the invention.
Embodiment one, and present embodiment is in order to reduce the generation of disk fragments, improves storage efficiency and makes things convenient for the management of video data, and the storage format of video data has been carried out following brand-new design:
Storage management program is carried out initialization to every video camera corresponding logical volume (hereinafter to be referred as target) in storer, it is divided into two big types: device head, i.e. MBR (size is 512B); Page or leaf, promptly leaf (size is 256M) is as shown in Figure 1.Therefore, new target is that the leaf of 256M forms by the size MBR that is 512B and several sizes.Certainly, the size of device head MBR and page or leaf leaf is not limited in above giving an example.Wherein, the size of MBR can be according to the adaptability revision of how much doing of its canned data amount; The size of leaf can be done adaptability revision according to the size that Streaming Media is stored code stream.In general, most of high-definition cameras at this moment, can be 256M with the size definition of leaf with the discharge record video data of 8Mbps (being 8Mbit p.s.), i.e. 256M byte byte.And when the flow of video camera surpasses 34Mbps, can be 512M or 1G with the size modification of leaf then, to satisfy memory requirement.This point also is the flexible part of the video data storage format that present embodiment proposed.
In the video data storage format of present embodiment, deposit the relevant information of page or leaf among the MBR, should comprise current page field Current_no and current offset field offset that video data is write at least; Certainly, also can further define MBR unique identification field as required, such as always a digital section Total_no and the camera number field Carema_id etc. of trade name Hisense, leaf.Each leaf is divided into two parts again: top margin head and data block block, and as shown in Figure 1.Therefore, leaf is made up of the block of a head and indefinite number.Wherein, top margin head deposits the start time that video data deposits this page in, carries out record through the time field, certainly, also can further define this page or leaf whether information available field Use flag and reserved field Resv (for subsequent expansion is continued to employ).Each block is divided into two parts again, and build and real video data memory block Video data are as shown in Figure 1.Wherein, include the size field Size of block and the time offset field Time_offset of relative top margin in the build; Certainly, the beginning unique identification field Magic_start that also can further deposit block with finish unique identification field Magic_end, the abnormal conditions that occur in the data storing process are handled being used for.
In the present embodiment, if when exceeding the memory capacity of a logical volume, can be that said video camera distributes other idle logical volume, and roll up for different logical and to give different titles through a video camera recorded video data.At this moment; Only write the numbering of same video camera in the Carema_id field of need device head in logical volume; What which logical volume correspondence was system can judge is same video camera; So that in follow-up video data retrieving, search program can be automatically transferred the video data of this camera record in the different logical volume.Adopt this design, avoided the conventional store mode certain disk partition capacity in a single day to occur when not enough, must carry out section post trouble caused again, reduced design difficulty whole magnetic disk.
Through setting up above-mentioned video data storage format, present embodiment has proposed following video data storage method, specifically comprises following storing process:
(1) after storage management program receives the video code flow that video camera transmits; At first select corresponding with it target to the video camera of the said video code flow of output; Be that the numbering that writes down in the Carema_id field of device head among numbering and the target of said video camera is consistent; Then, described video code flow is deposited in this logical volume.
(2) will be written to the current time in the time field of top margin; And the value in the Use flag field is revised as with sign, such as being revised as 1, represent that this page or leaf is used.
(3) sequence number with current page is written in the Current_no field of MBR, such as current at first page, current_no=1 then;
(4) begin the video data that receives is write among the block; In this process; At first the information in current data block (the being called for short current block) respective field that is used for stored video data is made amendment; Be written to such as time offset in the Time_offset field of build, then the video data that receives be deposited in the Video_data memory block of current block the relative top margin of current video data.
(5) after arriving official hour, after 1 minute, finish video data storing process to current block, be transferred to next block relaying and renew storage.At this moment, the size of current block is written in the Size field of build among the current block (size that comprises build and Video data memory block).Adopt this design to make the size of block to adjust, thereby reach the purpose of practicing thrift disk resource according to the size adaptation of data quantity stored.Then, in the offset of MBR field, write the side-play amount of current storage pointer in target, i.e. the end position of video data storage; Then, in the Magic_start of block field and Magic_end field, write the value of regulation, normal to show these block storage data, this block is effective.
(6) beginning renews the video data that storage receives at next block relaying, and return course (4) continues to carry out.
Current page write full after, open one page down, continue to carry out described process (2) to (6).
If it is full that current target writes, then open next and the corresponding target of said video camera, repeat above-mentioned storing process, continue the video code flow that receives is stored.
For last discontinuous two sections video code flows of time; In order to reach the continuity of storage; Present embodiment is when storing back one section video code flow, and the side-play amount that at first writes down in the offset field of fetch equipment head obtains to store the pointer position when the last period, video code flow finished; Then memory pointer is pointed to a back block of said pointer position, and begun back one section video code flow is carried out the block-by-block storage from this block.Thus one; Not only can avoid the generation of disk fragments; Conserve storage; And when back one section video code flow storage, can know at an easy rate and which position to begin continuous storage from, thereby having improved the storage speed of video data, this also is the advantage place of design storage format shown in Figure 1.
Adopt the video data storage method of present embodiment; In a single day abnormal conditions appear in the video code flow storing process; Such as cause partial information not to be written on the storer owing to the network reason, at this moment, in the build of block; The value that will occur non-regulation in its Magic_start field and/or the Magic_end field, expression can not read correct video data from this block.Adopt this design; When system carries out search program; In case run into such block, the method that can adopt downward order to read at the value in the Magic_start field and Magic_end field among the next block; Till the value that regulation occurs, so just can determine the position of next block.If in current page, do not find the Magic_start field and the Magic_end field that are endowed setting, then can arrive next page or leaf and continue to seek.Such benefit is: can avoid because of the network reason, when causing video data not carry out according to storage format shown in Figure 1, the search program that causes can't read the problem of block information.This also is storage format that present embodiment the proposed a kind of disposal route to abnormal conditions.
In order to improve the stability of retrieval performance and retrieval, present embodiment has carried out following design to the method that table and indexed search built in index:
At first, index service reads the relevant information among the target, in storer, sets up concordance list.In the present embodiment, a corresponding master index table of video camera and a secondary index table.The master index table is preserved video index information, can be made up of following field: the start time of video data, the video data side-play amount in target, the page or leaf at video data place.The secondary index table is preserved the index information of discontinuous (comprising discontinuous different two kinds of situation with the target title of time), can be made up of following field: among the last block among the start time of video data, the last block among the side-play amount of video data in target, the next block among the start time of video data, the next block among the side-play amount of video data in target, the next block video data belong to the title of target.
Secondly; Concordance program periodic polling target; When finding to have new block to occur; When promptly having new video data to deposit in, then calculate start time, the side-play amount of video data in target and the leaf at video data place of the video data of depositing among this block, record in the master index table according to information recorded among the block.If video data stored is discontinuous among this block and the last block, then also need in the secondary index table, to write corresponding information.
In this process; Can be through reading the time offset that writes in the Time_offset field among the new block; And the start time that video data recorded is deposited this page in the time field of this block place leaf, calculate start time of the video data of depositing among this block; Size (being the value that writes down in the Size field) according to each data block before this block calculates the side-play amount of video data in target of depositing among this block, then corresponding information is written in the concordance list.
Present embodiment preferably adopts the B-tree method to retrieve when the video data of preserving is retrieved, and in the process of retrieval, is divided into one-level retrieval and 2-level search two parts, to accelerate the response time, promotes recall precision.Specifically can accomplish through following step, in conjunction with shown in Figure 2:
S201, system receive the retrieval request of user's input;
S202, search corresponding video camera information, be kept among which target to determine and the corresponding target of this video camera, promptly to find out through this video camera recorded video data according to retrieval request;
S203, carry out one-level retrieval, i.e. master index table search:
According to retrieval start time of importing (being called for short t_s) and retrieval concluding time (being called for short t_e), in the master index table, retrieve the time (being called for short i_t_s) of the beginning index in t_s to t_e scope and the time (being called for short i_t_e) of end index;
S204, judge whether find relevant index information in the master index table,, then carry out subsequent step if having; Otherwise, jump to step S206;
S205, carry out 2-level search, i.e. secondary index table search:
According to i_t_s and i_t_e, retrieve the pairing block of each section continuous video data (time continuously and index on same target) in the secondary index table, and read the video data among the corresponding block;
S206, indexed search are replied, and promptly export result for retrieval;
In this process, if in the master index table, do not retrieve the information of section correlation time, promptly in the time period of t_s to t_e, there is not the recorded video image, then export the result who does not have video image in this time period.If retrieve relevant video data, then in the video image of the output time period that requires, give the sign of clearly picture recording time for last discontinuous video image of time.
Certainly; The above only is a kind of preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (9)
1. video data storage method comprises following process:
A0, storage management program are carried out initialization to each video camera corresponding logical volume in storer; It is divided into two big types: a device head and several pages or leaves; Wherein, Deposit the relevant information of page or leaf in the device head, comprise current page field Current_no and current offset field offset that video data is write; Each page or leaf is divided into two parts again: a top margin and at least one data block; Wherein, Include the start time field time that video data deposits this page in the top margin; Each data block is divided into two parts again: build and real video data memory block Video data wherein, comprise the size field Size of data block and the time offset field Time_offset of relative top margin in the build;
A, after storage management program receives video code flow, will be written to the current time in the time field of top margin;
B, the sequence number of current page is written in the Current_no field of device head;
C, the time offset of the relative top margin of preserving in the current data block of video data is written in the Time_offset field of build;
D, the video data that receives is deposited in the Video data memory block of current data block;
E, after arriving official hour, the size of current data block is written in the Size field of build in the current data block, and in the offset of device head field, writes the side-play amount of current storage pointer in logical volume;
F, beginning renew the video data that storage receives at next data block relaying, and return course c continues to carry out;
G, after current page has been write, open one page down, continue to carry out described process a to f.
2. whether video data storage method according to claim 1 is characterized in that: in said top margin, also include whether information available field Use flag of this page or leaf, be used for this page or leaf of sign and be used.
3. video data storage method according to claim 1 is characterized in that: the beginning unique identification field Magic_start and end unique identification field Magic_end that in said build, also include data block; The value of non-regulation in said beginning unique identification field Magic_start and/or end unique identification field Magic_end, occurred, thought that then this data block is a bad piece.
4. video data storage method according to claim 1; It is characterized in that: in said device head, also include the total individual digital section Total_no and the camera number field Carema_id of page or leaf, be respectively applied for total page number and the pairing camera number of this logical volume of depositing this device head place logical volume.
5. video data storage method according to claim 2 is characterized in that: in said process a, also comprise with this page in the top margin whether the value among the information available field Use flag be revised as with the process of sign, represent that this page or leaf is used.
6. video data storage method according to claim 3; It is characterized in that: in said process c; Also be included in the beginning unique identification field Magic_start and the process that finishes to write among the unique identification field Magic_end setting of current data block, the video data in the expression current data block is effective.
7. video data storage method according to claim 1; It is characterized in that: for last discontinuous two sections video code flows of time; When back one section video code flow is stored; The side-play amount that at first writes down in the offset field of fetch equipment head, the pointer position when obtaining the end of storage video code flow the last period; Then memory pointer is pointed to a back data block of said pointer position, begun back one section video code flow is carried out the block-by-block storage from said data block.
8. video data search method, retrieve to the data that adopt following data memory format to store:
Storage management program is carried out initialization to each video camera corresponding logical volume in storer; It is divided into two big types: a device head and several pages or leaves; Wherein, Deposit the relevant information of page or leaf in the device head, comprise current page field Current_no and current offset field offset that video data is write; Each page or leaf is divided into two parts again: a top margin and at least one data block; Wherein, Include the start time field time that video data deposits this page in the top margin; Each data block is divided into two parts again: build and real video data memory block Video data wherein, comprise the size field Size of data block and the time offset field Time_offset of relative top margin in the build;
Comprise following retrieving:
A, concordance program are set up concordance list in storer, a corresponding master index table of video camera and a secondary index table; Wherein, preserve video index information in the master index table, comprise start time, the side-play amount of video data in logical volume and the page or leaf at video data place of video data; The secondary index table is preserved discontinuous index information, comprises the side-play amount of video data in logical volume in start time and the next data block of video data in side-play amount in logical volume of video data in the start time of video data in the data block, the last data block, the next data block;
B, concordance program periodic polling logical volume; When new data block; Calculate start time, the video data side-play amount in logical volume and the page or leaf at video data place of the video data of depositing in this data block according to information recorded in the data block, record in the concordance list;
C, when the video data of preserving is retrieved, the two-stage retrieving below search program is carried out:
One-level retrieval:, in the master index table, retrieve the time of the beginning index in said start time and concluding time scope and the time of end index according to the retrieval start time and the concluding time of input;
2-level search: time and the time that finishes index according to described beginning index, in the secondary index table, retrieve the pairing data block of each section continuous video data, and read the video data in the respective data blocks, accomplish retrieving.
9. video data search method according to claim 8 is characterized in that: in said process A, the discontinuous index information that the secondary index table is preserved comprises the last discontinuous index information different with logical volume of time; The index information that in the secondary index table, also comprises video data place logical volume name in the next data block.
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| CN102968422B (en) * | 2011-08-31 | 2015-06-17 | 中国航天科工集团第二研究院七0六所 | System and method for controlling streaming data storage |
| CN103092849A (en) * | 2011-10-28 | 2013-05-08 | 浙江大华技术股份有限公司 | File system cluster management method |
| CN103310814B (en) * | 2012-03-08 | 2016-05-18 | 安凯(广州)微电子技术有限公司 | The method and system of recording a video on low side embedded product |
| CN104427351B (en) * | 2013-08-30 | 2017-11-21 | 北京计算机技术及应用研究所 | Method for rapidly positioning and system for the time-interleaving video flowing of video monitoring |
| CN103761056A (en) * | 2014-01-17 | 2014-04-30 | 浪潮电子信息产业股份有限公司 | Stream data storage method in video monitoring application |
| CN105242983B (en) | 2014-06-26 | 2018-06-01 | 杭州海康威视系统技术有限公司 | A kind of date storage method and a kind of data storage management service device |
| CN105335387A (en) * | 2014-07-04 | 2016-02-17 | 杭州海康威视系统技术有限公司 | Retrieval method for video cloud storage system |
| CN104182354B (en) * | 2014-08-26 | 2017-12-15 | 浙江宇视科技有限公司 | A kind of video management method and device |
| CN105100716B (en) * | 2015-07-23 | 2018-09-18 | 浙江立元通信技术股份有限公司 | A kind of secure storage unit and its system for Network Video Surveillance |
| CN106202558A (en) * | 2016-07-29 | 2016-12-07 | 成都神州数码索贝科技有限公司 | A kind of efficient security protection industry audio, video data storage format and querying method thereof |
| CN106326439B (en) * | 2016-08-26 | 2019-08-23 | 东方网力科技股份有限公司 | A kind of storage of real-time video, search method and device |
| CN106713926B (en) * | 2016-12-28 | 2021-08-03 | 新岸线(北京)科技集团有限公司 | Compression storage method and device for video data |
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