CN100596196C - Video storage method, device and network video monitoring system - Google Patents
Video storage method, device and network video monitoring system Download PDFInfo
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- CN100596196C CN100596196C CN200710112449A CN200710112449A CN100596196C CN 100596196 C CN100596196 C CN 100596196C CN 200710112449 A CN200710112449 A CN 200710112449A CN 200710112449 A CN200710112449 A CN 200710112449A CN 100596196 C CN100596196 C CN 100596196C
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Abstract
The invention discloses a video memory method which includes steps: the memory equipment sends group broadcast adding report for group broadcast corresponding with group broadcast address; the networkequipment receives said report, builds transmit item; the network equipment receives the video flow that coder regards the group broadcast address as destination address, as said transmit item, the video flow is sent to memory equipment in group broadcast. With the invention, the spending of coder can be decreased, and usage of network bandwidth can be increased. Correspondingly, the invention also provides a video memory device, and a network video monitoring system.
Description
Technical field
The present invention relates to the Network Video Surveillance technical field, relate in particular to a kind of video storage method, device and network video monitor and control system.
Background technology
The video monitoring technology has experienced analog video monitoring and digital video monitoring after two stages, has developed into the Network Video Surveillance stage.The new generation network video monitoring system and preceding two generation video monitoring system fundamental difference be, it no longer is confined to simply to Video signal processing, transmission and control, its core is to (Internet Protocol, IP) multimedia messages of network (audio/video/data) provides comprehensive, a complete management console based on Internet protocol.Network video monitor and control system is support with the network, compression, transmission, storage and broadcast with digital video are core, the graphical analysis practical with intelligence is characteristic, and is incorporated on the usage platform with warning system and gate control system, caused a technological revolution of field of video monitoring.
The video monitoring system basic function has two, and one provides real-time monitor video, and another is that the video of monitoring is stored, so that playback afterwards.Wherein, network video monitor and control system has following characteristics to the demand of video storage:
1) elasticity to storage capacity requirement is bigger, memory capacity what along with the increase of the increase of the raising of image quality, picture dimension and video line all can be at double increase;
2) performance requirement to storage is not high, but needs to satisfy long continuous data read-write, and data traffic is big, but access request is low;
3) the data retention cycle is short, and the data of generally monitoring the place are preserving certain hour (as month), just can delete later on.
The video storage solution of existing network video monitoring system, a kind of is to adopt distributed separate, stored, referring to Fig. 1, is this scheme schematic diagram.In this kind storage solution, (Direct Attached Storage, DAS) connected mode is that every monitoring server directly articulates an external storage for the storage expansion to adopt direct additional storage.The disposable purchase cost of this mode is lower, and on a small scale maintenance cost but is unfavorable for expansion also in controlled range, and maintenance cost can increase rapidly along with the expansion of monitoring scale, can not satisfy the requirement of present storage massive video data.
Along with based on network small computer system interface (internet Small Computer SystemInterface, iSCSI) agreement and storage area network (Storage Area Network, SAN) development, the existing network video monitoring system generally adopts the centralised storage scheme, and the characteristics of this video storage scheme are that data quantity stored is big, the data retention cycle is long, safe.Referring to Fig. 2, be network video monitor and control system schematic diagram based on the centralised storage scheme.Whole network video monitor and control system comprises gathers front end 201, storage rear end (SAN network) 202 and on-line monitoring end 203, be connected by IP network 204 with on-line monitoring end 203 and gather front end 201, for simplicity, be example only among the figure with an encoder 2011 and a decoder 2031, in the actual supervisory control system, often there are a plurality of encoders 2011 and decoder 2031.Wherein, front monitoring front-end 201 comprises encoder 2011 at least, and encoder 2011 can send the video flowing that generates respectively to storage rear end 202 and IP network 204, reach the purpose of video storage and on-line monitoring, is expressed as storage flow and on-line monitoring stream among the figure respectively.For video storage, encoder 2011 is set up iSCSI by the SAN interface of self with the memory device 2021 that storage rear end 202 provides and is connected, with the target memory space (target) of video flowing with the mode write storage device 2021 of data block, wherein, gather front end 201 be based on transmission control protocol (Transmission ControlProtocol, TCP) carrying iSCSI, adopt mode of unicast to storage rear end 202 transmitting video-frequency flows.In addition, encoder 2011 according to for the multicast address of self configuration to sending a on-line monitoring stream again for the network equipment 2041, send to the decoder 2031 of on-line monitoring end 203 by the network equipment 2041 with the multicast form, finally realize on-line monitoring.
But, the problem that the network video monitor and control system based on centralised storage shown in Figure 2 exists some to be difficult to overcome:
(1) encoder 2011 all will repeat transmission to video flowing at every turn, just respectively to storage rear end 202 and the network equipment 2041 transmission, and be to adopt clean culture and multicast dual mode respectively, this has increased burden for undoubtedly encoder 2012, has caused the big problem of encoder 2012 expenses;
(2) adopt clean culture and multicast mode to carry out being actually a kind of waste respectively, in theory, wasted 50% network bandwidth Internet resources with a video flowing transmission;
(3) adopt TCP carrying iSCSI to carry out the transmission of video flowing to storage rear end 202 from gathering front end 201, because the reliability mechanisms of TCP self, can guarantee the integrality and accuracy (the still introduction that video storage is required as the front of video flowing, video storage is less demanding to memory property), this is its advantage, yet, these all are to be based upon TCP to utilize on the basis that various control information guarantees, so correspondingly, because the signaling consumption of these control informations, certainly will cause transmission slowly, real-time difference and the low inferior problem of storage efficiency.And as the introduction of front to the video storage requirement, video storage need be stored mass data, and transmission continuously often, if transmission speed is slow, is difficult to satisfy above-mentioned requirements.
In addition, because the storage flow of video and the transmission of on-line monitoring flow point two-way need to make up the two-way transmission channel, very low for the recycling rate of waterused of the network equipment, the construction cost of whole system increases.
Summary of the invention
In view of this, the present invention is on the basis of existing Internet video storage system based on centralized video storage, a kind of video storage method, device and network video monitor and control system are provided, and the signaling consumption that exists in the existing video storage is big to solve, network resources waste and the low problem of efficiency of transmission.
For this reason, the embodiment of the invention adopts following technical scheme:
A kind of video storage method comprises step: memory device sends multicast to the network equipment and joins message, and application adds the multicast group of the multicast address correspondence of encoder; After the network equipment receives described joining message, for memory device is set up forwarding-table item; The network equipment receives after encoder is the video flowing of destination address with the multicast address, according to described forwarding-table item, video flowing is sent to memory device with the form of multicast.
Said method also comprises: described memory device is set up and the multicast address corresponding memory space, and the video flowing that receives is write described memory space.
Said method also comprises: described memory device is resolved after utilizing self SAN interface with the video flowing buffer memory that receives, be packaged into the iSCSI message after, order writes described memory space.
Said method also comprises: the video flowing that deposits memory space in is safeguarded control; Described maintenance control comprises: be provided with video flowing holding time, video flowing is carried out encryption, perhaps, the access rights of memory space are set.
Said method also comprises: by the image detection to the on-line monitoring end, judge whether to occur the video flowing packet loss, if reduce the encoding rate of described encoder.
Described encoder sends video flowing according to TCP to the described network equipment.
A kind of video storage device comprises: SAN interface and memory space; Described memory space is corresponding with multicast address; Described SAN interface is responsible for sending multicast to the network equipment and is joined message, and application adds the multicast group of the multicast address of memory space correspondence; And, be responsible for receiving the video flowing that the network equipment sends, and described video flowing is written to memory space.
Described memory space is a plurality of, and a multicast address is corresponding with a memory space at least; Described SAN interface is the system platform that initiator software is installed.
A kind of network video monitor and control system comprises encoder, decoder, the network equipment and memory device; Described encoder disposes multicast address, and to be responsible for the multicast address be that destination address sends video flowing to the network equipment; Described memory device is used for sending multicast to the network equipment and joins message, and application adds the multicast group of the multicast address correspondence of described encoder; And, also be responsible for receiving the also video flowing of storage networking device transmission; The described network equipment is after the multicast of receiving described memory device joins message, for memory device is set up forwarding-table item; And be responsible for after receiving the video flowing of described encoder, according to described forwarding-table item, video flowing is sent to described memory device with the multicast form.
Described memory device comprises SAN interface and memory space; Described memory space is corresponding with multicast address; Described SAN interface is responsible for sending multicast to the network equipment and is joined message, and application adds the multicast group of the multicast address of memory space correspondence; And, be responsible for receiving the video flowing that the network equipment sends, and described video flowing is written to memory space.
Technique effect for technique scheme is analyzed as follows:
(1) with prior art in encoder to send storage flow with clean culture and multicast form respectively different with on-line monitoring stream, encoder only need send a video flowing among the present invention, thereby has reduced spending of coder;
(2) the present invention unites storage flow and on-line monitoring stream, only needs a video flowing can realize storage and on-line monitoring, has improved network bandwidth utilance;
(3) encoder adopts User Datagram Protoco (UDP) (User Datagram Protocol, UDP) as transmission mechanism video flowing is sent to the network equipment, because the advantage of the low time delay of UDP self, improve real time of data transmission and storage efficiency, satisfied video monitoring system storage mass data and the requirement of storage continuously better;
(4) do not need to make up the transmission channel of encoder and memory device, but send storage flow and on-line monitoring stream with the multicast form, improved network equipment utilance, reduced the construction cost of whole network monitoring system by network equipment unification.
Description of drawings
Fig. 1 is the distributed independent vide storage scheme of a prior art schematic diagram;
Fig. 2 is the network video monitor and control system schematic diagram of prior art based on centralised storage;
Fig. 3 is a video storage method flow chart of the present invention;
Fig. 4 is an embodiment of the invention network video monitor and control system schematic diagram;
Fig. 5 is an embodiment of the invention video storage method flow chart;
Fig. 6 is an embodiment of the invention video storage device internal structure schematic diagram.
Embodiment
The present invention combines video storage and multicasting technology, proposes a kind of brand-new video storage solution.
Utilize clean culture and multicast to realize that the storage of video flowing is different with on-line monitoring respectively with prior art, the present invention unites storage flow and on-line monitoring stream, just encoder only needs to send a video flowing to the network equipment, and sending video flowing with the multicast form by the network equipment: the video flowing that sends to memory device is used to realize video storage, and the video flowing that sends to decoder is used to realize the video on-line monitoring.
In the specific implementation, gathering front end, each encoder is corresponding with a multicast address, and when sending video flowing, encoder is that destination address sends to the network equipment with the multicast address; At storage rear end and IP network end, memory device at first sends to the network equipment and joins message, apply for the multicast group that it selects adding, this multicast group just multicast address of encoder correspondence is determined, then, the network equipment can be set up forwarding-table item for memory device, so that follow-up to its transmission video flowing.
Referring to Fig. 3, be video storage flow chart of the present invention, comprising:
Step 301: memory device sends multicast to the network equipment and joins message, and application adds the multicast group of the multicast address correspondence of encoder;
Step 302: after the network equipment receives described joining message, for memory device is set up forwarding-table item;
Step 303: the network equipment receives after encoder is the video flowing of destination address with the multicast address, according to described forwarding-table item, video flowing is sent to memory device with the form of multicast.
Different with on-line monitoring stream with multicast form transmission storage flow with clean culture respectively with encoder in the prior art, encoder only need send a video flowing among the present invention, thereby has reduced spending of coder; And, only need a video flowing can realize storage and on-line monitoring because storage flow and on-line monitoring stream are united, improved network bandwidth utilance; In addition, owing to do not need to make up the transmission channel of encoder and memory device, but unify multicast storage flow and on-line monitoring stream by the network equipment, improved network equipment utilance, reduced the construction cost of whole network monitoring system.
For the present invention there being an overall situation understand, see also Fig. 4, be the network video monitor and control system schematic diagram in the embodiment of the invention.
Similar with the network video monitor and control system based on centralised storage in the prior art, network video monitor and control system in the embodiment of the invention still comprises gathers front end 401, IP network end 402, storage rear end 403 and on-line monitoring end 404, but, gather front end 401, IP network end 402 and storage rear end 403 each several part functions and the correspondence between them great changes have taken place, particularly gather front end 401 and storage rear end 403 software and hardware structure also with scheme of the prior art difference to some extent, now be described below respectively:
The first, gathering front end 401 does not need to set up with storage rear end 403 to communicate by letter again: gather front end 401 and need not get final product but only send a video flowing to the IP network end to send storage flow, to send online monitoring flow to IP network end 402 to storage rear end 403 respectively;
The second, IP network end 402 is set up with storage rear end 403 and communicate by letter: comprise that 403 applications of storage rear end add the multicast group of the network equipments 4021, and the network equipment 4021 will send to memory device 4031 with the multicast form from the video flowing that collection front end 401 receives;
Wherein, the network equipment 4021 can be equipment such as router or three-tier switch.
The 3rd, the SAN interface of existing encoder to be transferred on the memory device 4031, memory device 4031 utilizes the SAN interface to receive the video flowing that the network equipment 4021 sends with the multicast form.
Wherein, the SAN interface can be the system platform that initiator software is installed.
Below in conjunction with Fig. 5, the detailed process of the embodiment of the invention is described, comprising:
Step 501: be encoder 4011 configuration multicast address;
Step 502: set up target memory space (target) on memory device 4031, this target is corresponding with the multicast address of encoder 4011;
Generally speaking, can set up a plurality of target on the memory device 4031, each target is a sign with different multicast address, also is that each target is responsible for storing the video flowing from different coding device 4011, can be understood as each target and each multicast address has binding relationship.Perhaps, also a plurality of target can be bound, corresponding with a multicast address, just will be stored in different target respectively as required from the video flowing of an encoder 4011, for example,, be stored in different target respectively according to time sequencing.
Step 503: memory device 4031 sends multicast to the network equipment 4021 and joins message, for example, IGMP (Internet Group Multicast Protocol, IGMP) group membership joins message, and application adds the multicast group of the multicast address correspondence of encoder 4011;
Step 504: the network equipment 4021 is that memory device 4031 is set up (S, G) forwarding-table item;
In multicast protocol, by (S, G) multicast shortest path tree of sign (Shortest Path Tree, SPT), specific I P multicast group address of (G) expression wherein, and (S) expression is sent to the IP address of the particular source of multicast group G.
Above step 501 is to 504, and the method for can thinking is implemented the preparatory stage, also is the storage policy preparatory stage, is the prerequisite that subsequent step is realized video storage.
In practical operation, network video monitor and control system shown in Figure 4 also can comprise a storage policy controller, finishes the enforcement of above-mentioned storage policy preparatory stage; Also can adopt the mode of manual configuration to finish.
Step 505: encoder 4011 is that purpose sends to the network equipment 4021 with video flowing with UDP message form, with its corresponding multicast address;
Utilize UDP to have a lot of advantages, for example, realize simple, low time delay, thereby can improve real time of data transmission, can satisfy the requirement of video storage efficient and speed as transmission mechanism.
Step 506: the network equipment 4021 is according to (S, G) list item send to memory device 4031 with video flowing;
Certainly, the network equipment 4021 is except sending the video flowing to memory device 4031, and is still the same with prior art, sends video flowing to decoder 4041, to realize online monitor video.
Step 507: memory device 4031 utilizes SAN interface receiver, video stream, and video flowing is carried out buffer memory;
If the SAN interface is initiator, at first the data in buffer message is split by initiator, encapsulate according to the iSCSI agreement then.
Step 508: the video flowing of 4031 pairs of buffer memorys of memory device sorts, and writes the target of multicast address correspondence at last.
So far, can realize video storage method provided by the invention.
Need to prove that in order further to optimize implementation result, the embodiment of the invention has been further considered the packet loss problem that might exist in the transmission course., in the video flowing transmission course of the network equipment 2021, can both guarantee in the network of enough bandwidth at encoder 2011, can guarantee the complete on time arrival of data message substantially at each road video flowing; But in insecure network, then differing guarantees the integrality of message surely fully, at this moment, can reduce the probability of packet loss by the encoding rate of adjusting encoder 2011.Specifically be, when the image that occurs being caused by frame-skipping when on-line monitoring end 204 jumps, can confirm to occur the problem of packet loss, at this moment, can reduce the encoding rate of encoder 2011, thereby reduce the speed that the UDP message sends, to reduce packet loss.
Also need to prove, the present invention aims to provide and a kind of video flowing is sent to the solution that memory device 2031 carries out video storage, for how video stream stored further being safeguarded control in storage rear end 203, for example, the control of video flowing security strategy, video retention cycle and the access rights of memory space are provided with etc., can utilize the present invention to realize further implementing on the basis of video storage.
Corresponding with network video monitor and control system provided by the invention and video storage method, the present invention also provides a kind of video storaging equipment, also is the memory device 4011 among Fig. 4.
Referring to Fig. 6, be the internal structure schematic diagram of video storaging equipment, comprise SAN interface 601 and memory space (target) 602.Memory space 602 can have a plurality of, and a multicast address is corresponding with a memory space 602 at least.SAN interface 602 can be the system platform that initiator software is installed, and main being responsible for joins message to the network equipment 4021 transmission multicasts, and application adds the multicast address place multicast group of memory space 602 correspondences; And, be responsible for receiving the video flowing that the network equipment 4021 sends, and video flowing is written to the pairing memory space 602 of video flowing multicast address.
Certainly, video storaging equipment provided by the invention can also further be safeguarded control to video flowing on the basis of the above, for example, and the control of video flowing security strategy, video retention cycle and the access rights setting of memory space.
At last, with a simple and direct example the present invention is carried out further image explanation.
1, the encoder A for on-site supervision district X disposes multicast address: 224.1.1.1;
2, the video flowing of memory device B desire storage on-site supervision district X: on memory device B, set up target_1, called after 224.1.1.1;
3, memory device B utilizes self SAN interface to send multicast to network equipment C to join message, and application adds the 224.1.1.1 multicast group;
4, network equipment C sets up forwarding-table item for memory device B;
5, encoder A is that destination address sends video flowing to network equipment C with 224.1.1.1;
6, network equipment C sends to memory device B according to forwarding-table item with video flowing;
7, memory device B utilizes SAN interface receiver, video stream, is written among the target_1 at last.
The above only is a 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 improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1, a kind of video storage method is characterized in that, comprising:
Memory device sends multicast to the network equipment and joins message, and application adds the multicast group of the multicast address correspondence of encoder;
After the network equipment receives described joining message, for memory device is set up forwarding-table item;
The network equipment receives after encoder is the video flowing of destination address with the multicast address, according to described forwarding-table item, video flowing is sent to memory device with the form of multicast.
2, according to the described method of claim 1, it is characterized in that, also comprise:
Described memory device is set up and the multicast address corresponding memory space, and the video flowing that receives is write described memory space.
3, according to the described method of claim 2, it is characterized in that, also comprise:
Described memory device is resolved after utilizing self storage area network interface with the video flowing buffer memory that receives, be packaged into the iSCSI message after, order writes described memory space.
4, according to the described method of claim 3, it is characterized in that, also comprise:
The video flowing that deposits memory space in is safeguarded control;
Described maintenance control comprises: be provided with video flowing holding time, video flowing is carried out encryption, perhaps, the access rights of memory space are set.
5, according to each described method in the claim 1 to 4, it is characterized in that, also comprise:
By image detection, judge whether to occur the video flowing packet loss, if reduce the encoding rate of described encoder to the on-line monitoring end.
According to each described method in the claim 1 to 4, it is characterized in that 6, described encoder sends video flowing according to User Datagram Protoco (UDP) to the described network equipment.
7, a kind of video storage device is characterized in that, comprising: storage area network interface and memory space;
Described memory space is corresponding with multicast address;
Described storage area network interface is responsible for sending multicast to the network equipment and is joined message, and application adds the multicast group of the multicast address of memory space correspondence; And, be responsible for receiving the video flowing that the network equipment sends, and described video flowing is written to memory space.
8, according to the described device of claim 7, it is characterized in that,
Described memory space is a plurality of, and a multicast address is corresponding with a memory space at least;
Described storage area network interface is the system platform that initiator software is installed.
9, a kind of network video monitor and control system comprises encoder, decoder, the network equipment and memory device; Described encoder disposes multicast address, and to be responsible for the multicast address be that destination address sends video flowing to the network equipment; It is characterized in that,
Described memory device is used for sending multicast to the network equipment and joins message, and application adds the multicast group of the multicast address correspondence of described encoder; And, also be responsible for receiving the also video flowing of storage networking device transmission;
The described network equipment is after the multicast of receiving described memory device joins message, for memory device is set up forwarding-table item; And be responsible for after receiving the video flowing of described encoder, according to described forwarding-table item, video flowing is sent to described memory device with the multicast form.
According to the described system of claim 9, it is characterized in that 10, described memory device comprises storage area network interface and memory space;
Described memory space is corresponding with multicast address;
Described storage area network interface is responsible for sending multicast to the network equipment and is joined message, and application adds the multicast group of the multicast address of memory space correspondence; And, be responsible for receiving the video flowing that the network equipment sends, and described video flowing is written to memory space.
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| CN200710112449A CN100596196C (en) | 2007-06-26 | 2007-06-26 | Video storage method, device and network video monitoring system |
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| CN104067559B (en) * | 2012-12-31 | 2018-03-09 | 华为技术有限公司 | The method for testing performance of multicast channel, device and system |
| CN110430479B (en) * | 2019-07-09 | 2021-06-15 | 深圳市拔超科技有限公司 | Multicast group address allocation method of video matrix and video matrix |
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