CN104506802B - The method of video monitoring system, passing through NAT monitor video data - Google Patents
The method of video monitoring system, passing through NAT monitor video data Download PDFInfo
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Abstract
This application discloses video monitoring systems and the method for passing through NAT monitor video data, monitoring server redirects the equipment connection request of client, the identification information of IP address of the equipment connection request after redirection including Client Agent module, predetermined port and video equipment；Client Agent module monitors the equipment connection request after client redirects from predetermined port, establishes UDP channel according to the identification information of video equipment and video equipment proxy module, passes through UDP channel forwarding service control information or video data related news；And first port and second port are opened, the business control information is interacted with client by first port, passes through second port and client interactive video data related news；Video equipment proxy module establishes UDP channel and by UDP channel forwarding service control information or video data related news with Client Agent module.The bandwidth consumption of monitoring server can be reduced by the system and method for the application.
Description
Technical field
This application involves NAT crossing technologies more particularly to a kind of video monitoring systems and the access of client passing through NAT to regard
The method of frequency evidence.
Background technology
Video equipment (NVR (Network Video Recorder, network hard disk video recorder), IPC in the prior art
(IP camera, web camera), DVR (Digital Video Recorder, digital video recorder) etc.) it is located at private network mostly
In, and the client for needing to obtain the video of video equipment to be monitored is led to often with video equipment not in same private network
Internet can not be directly accessed by being located at the equipment in private network under reason condition, but access public network, therefore this by router NAT
A little video datas can not be accessed directly by external client.In order to enable internal video equipment can be by the other clients of outer net
It accesses, service provider needs to set up monitoring server in public network.When user needs video device access, the prison of public network is accessed first
Server is controlled, the monitoring server of public network asks video to video equipment by NAT device, then relays to client.
But since the video data volume is very big, the monitoring server of public network needs to consume massive band width, and easily becomes
Performance bottleneck point.Path is non-optimal, and transmission of video easily generates larger network harm：Packet loss, time delay, shake etc..
The content of the invention
A kind of method that the application provides video monitoring system and client passing through NAT accesses video data, can subtract
The bandwidth consumption of the monitoring server of few public network.
According to the embodiment of the present application in a first aspect, provide a kind of video monitoring system, including：Monitoring in public network
Server；The Client Agent module of same private network is in client and the video of same private network is in the video equipment
Proxy for equipment module, the client and the video equipment are located in different private networks；
The monitoring server, for the equipment connection request of the client to be redirected, after the redirection
The IP address of equipment connection request including the Client Agent module, the identification information of predetermined port and video equipment；
The Client Agent module, for monitoring the equipment connection after the client redirects from the predetermined port
Request establishes UDP channel according to the identification information of the video equipment and video equipment proxy module, passes through the UDP channel
Forwarding service control information or video data related news；And first port and second port are opened, pass through the first port
The business control information is interacted with the client, the video data is interacted with the client by the second port
Related news；
The video equipment proxy module, for establishing UDP channel and by described with the Client Agent module
UDP channel forwarding service control information or video data related news.
The application also provides a kind of method of passing through NAT monitor video data, and the network of the method operation includes public affairs
Monitoring server in net；The Client Agent module of same private network is in client and is in same with the video equipment
The video equipment proxy module of private network, the client and the video equipment are located in different private networks；
The method includes the steps：
The Client Agent module monitors the equipment connection request after the client redirects from predetermined port, described
Equipment connection request after redirection includes the IP address of the Client Agent module, the predetermined port and video equipment
Identification information；
UDP channel is established according to the identification information of the video equipment and the video equipment proxy module, and opens the
Single port and second port interact the business control information by the first port with the client, pass through described
Two-port netwerk interacts the video data related news with the client；
Pass through the UDP channel forwarding service control information or video data related news.
The application passes through Client Agent module on the premise of existing client end and video equipment business function is not changed
With video equipment proxy module establish one can passing through NAT point-to-point UDP channel, realize the direct of client and video equipment
Communication without being subjected to monitoring server processing, therefore greatly reduces the data processing amount of monitoring server, reduces monitoring
The bandwidth consumption of server.Since client device and video equipment are communicated by UDP channel, video data transmission path
It realizes optimal.
Description of the drawings
Fig. 1 is the system construction drawing of video monitoring system in the embodiment of the present application；
Fig. 2 is video equipment proxy module or the hardware structure diagram of Client Agent module in the embodiment of the present application；
Fig. 3 is the sequence diagram of the method for passing through NAT monitor video data in the embodiment of the present application.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the application.
It is only merely for the purpose of description specific embodiment in term used in this application, and is not intended to be limiting the application.
It is also intended in the application and " one kind " of singulative used in the attached claims, " described " and "the" including majority
Form, unless context clearly shows that other meanings.
Video monitoring system in the application includes at least three roles：Monitoring server and client in public network
End is located at the video equipment proxy module of same private network positioned at the Client Agent module of same private network, with the video equipment.
In this application described client either under browser or C/S frameworks under B/S client frameworks should
With program, Client Agent module can be existed in the form of client plug-in, service that can also be by client or process
Etc. a variety of realization methods.Client and Client Agent module can be located at same equipment, can also be located at distinct device；Video
Equipment and video equipment proxy module, which can be located at same equipment, can also be located at distinct device.
Fig. 1 is the network architecture diagram of video monitoring system in the application, and the video monitoring system of the application includes monitoring and takes
Business device, video equipment proxy module and Client Agent module.With Client Agent module and client positioned at same in the figure
Client device (such as in PC), video equipment proxy module illustrate exemplified by being located in video equipment.In this application, depending on
Frequency equipment and client device access the monitoring server in public network (internat) by router, and router enables NAT
Function.Monitoring server assists video equipment proxy module and Client Agent module to complete UDP establishment of connections.
The Client Agent module and video equipment proxy module of the application can be realized by software, can also be by hard
The mode of part or software and hardware combining is realized.It is by its institute as the device on a logical meaning exemplified by implemented in software
Corresponding computer program instructions in nonvolatile memory are read to what operation in memory was formed in the processor of equipment.From
For hardware view, the hardware configuration of the device where Client Agent module and video equipment proxy module is except shown in Fig. 2
Processor, network interface, outside memory and nonvolatile memory, can also usually include other hardware, for example, video
Video equipment where proxy for equipment module can also include camera, and the client device where Client Agent module may be used also
To include display screen etc., this Fig. 2 is no longer shown specifically.
The application passes through Client Agent module on the premise of existing client end and video equipment business function is not changed
With video equipment proxy module establish one can passing through NAT point-to-point UDP channel, realize the direct of client and video equipment
Communication.Under the premise of without existing for the proxy module of client client perception end, monitoring server is regarded what client was sent
Frequency request, which redirects, gives Client Agent module, and Client Agent module is allowed to serve as the server of client, and passes through client
The UDP channel that proxy module is established obtains video data.
The concrete function of each module in video monitoring system introduced below：
Monitoring server is used to redirect the equipment connection request that client is sent to the predetermined of Client Agent module
Port, so that client can obtain video data by the UDP channel that Client Agent module is established.It is reset to realize
To, it is necessary to arrange a predetermined port in advance, Client Agent module can establish monitoring on this port, and monitoring server is then
The generation of this port can be utilized to redirect to reply, the equipment connection request after redirection is with can carrying the IP of Client Agent module
The identification information of location, predetermined port and video equipment.
After video request after redirection sends back to client, client can be according to the predetermined end slogan redirected in message
And the equipment connection request after redirection is dealt into Client Agent module, client generation by the IP address of Client Agent module
Reason module is used for when receiving the equipment connection request after redirecting, and triggering establishes UDP channel with video equipment proxy module
Operation；And video data is obtained by UDP channel；And first port and second port are opened, pass through first port and client
The end interaction business control information, the video data related news are interacted by second port with client.Detailed process
Referring to the described contents of Fig. 3.
Video equipment proxy module is used for the various operations that customer in response end proxy module is triggered, specifically, working as client
When UDP channel flow is established in end proxy module triggering, UDP channel is established with Client Agent module；When Client Agent module
It is required that when obtaining video data, video data is obtained from video equipment, and passes through UDP channel transmitting video data.
The operation principle of video monitoring system is illustrated with reference to the method for Fig. 3 video monitoring system monitor video data, still
With Client Agent module and client be located at same client device (such as in PC),
Video equipment proxy module illustrates exemplified by being located in video equipment.
Unique mark (such as video equipment ID) is just informed monitoring service by video equipment when being registered to monitoring server
Device, monitoring server record have the ID of video equipment, the address of the video equipment and video equipment proxy module and service port.
S31：When client asks connection video equipment to monitoring server, will can need to connect in equipment connection request
The ID of the video equipment connect issues monitoring server together；
S32：Monitoring server returns to client and redirects message, and the equipment connection request transmitted by S31 is redirected
To Client Agent module.It redirects in message and not only contains the original devices such as video equipment ID (video equipment identification information)
Parameter in connection request further comprises the IP address of Client Agent module and predetermined end slogan.
It is readily appreciated that, when client is sent to monitoring server asks, in the case of client is browser, may be used also
With comprising a pre- deterministic process, client judges whether to have had been loaded into Client Agent module, if not loading or needing
It updates, then client is prompted.Client is after proxy module is installed again after monitoring server sends request
Continue to redirect operation.By taking client is browser as an example, in one embodiment, Client Agent module can take from monitoring
Business device is downloaded, and the download address of other servers can also be informed client by monitoring server, client is serviced to other
Device is downloaded.
S33：Client Agent module is intercepted in predetermined port, after the redirection that client is sent is received by the port
Equipment connection request.
S34：Client Agent module triggers the stream for establishing UDP channel after receiving the equipment connection request after redirecting
Journey.As an example, due to including the parameters such as video equipment ID, client in the equipment connection request after redirection
Proxy module establishes UDP channel to monitoring server request, can carry the parameters such as video equipment ID in request and client is set
The information (S340) such as standby and Client Agent module address and service port；Monitoring server receive establish UDP channel please
Client Agent module is informed into the address of video equipment proxy module and service port information after asking, and by Client Agent mould
The address of block and service port inform video equipment proxy module (S341)；Client Agent module and video equipment proxy module
UDP channel (S342) is set up after address and service port information is received.It establishes UDP connections the UDP of standard may be employed and beat
Hole technology realizes that details are not described herein.
S35：As an example, after Client Agent module establishes UDP channel, two ports will be opened and be directed to respectively
The video data relevant information and business control information of client.In order to facilitate description, with client interactive service control information
Corresponding port is known as first port, and port corresponding with client interactive video data association message is known as second port.
Client Agent module after UDP channel is successfully established by first port to client returning response, carry in the response
Equipment connection request after the redirection received before is redirected to first by the port information of Single port and second port again
Equipment connection request after redirection is sent to the first port of Client Agent server by port, client again.
Client Agent module monitors first port, after the equipment connection request (S36) that client is sent again is received
Triggering obtains the flow (S37) of video data by UDP channel.
S38, video equipment proxy module receive the backward video equipment of request that Client Agent module obtains video data
Ask video data；
Video data is returned to video equipment proxy module by S39, video equipment；
Video data is returned to Client Agent module by S40, video equipment proxy module by UDP channel；
The video data obtained is sent to client by S41, Client Agent module.
In one embodiment, the flow of Client Agent module acquisition video data includes two negotiations in S37-S41
Process, is the negotiations process of Service control request first, followed by the negotiations process of video request, in order to make two kinds of different types
Request can be transmitted by same UDP channel, Client Agent module newly disappears the message constructing received from client
Breath, as an example, the mode for constructing new information are that type of message mark ID is added in message header, so as to tell
The message sent is business control information or video data relevant information；In addition, it may be opened for client device
The situation of dynamic multiple client (starting multiple browsers), can also define a connection identifier ID, to differentiate different clients
End connection.
S370：In the negotiations process of Service control request, the equipment that Client Agent module receives first port connects
Video equipment proxy module is issued after connecing request addition type of message mark and connection type mark；In one example, equipment
Connection request is HTTP request；
S371：Video equipment proxy module parses the equipment connection request received, message header is removed, with video equipment
Service control server establishes connection, is responded；
S372：Video equipment proxy module is also needed to add type of message mark in the message header by response message and connected
Mark is connect, to identify the type of message of response and connection ID.
S373：Client Agent module removes message header after the response of video equipment proxy module reply is received, will
Message body returns to client, the negotiations process of finishing service control protocol by first port.
After the negotiations process of finishing service control protocol, due to the redirection response that Client Agent module returns before
In the port information of first port, second port is informed into client, therefore client will be sent by second port and be regarded
Frequency asks to give Client Agent module, the mode of reference step S370-S373, after Client Agent module encapsulates video request
Video equipment proxy module is transferred to by UDP, video equipment proxy module obtains response from the video server of video equipment
After be transferred to Client Agent module, video request is responded and returns to client by second port by Client Agent module.
After video request negotiations process is completed, real video data is issued video equipment agency by the video server of video equipment
Module, transmission mode is similar with video request transmission mode, repeats no more.
A customer case for realizing the flow of Client Agent module acquisition video data in Fig. 3 is exemplified below, with more
Add and clearly understand the application.
In this example, monitoring server is HTTP websites, can provide simple dynamic domain name function, and client is browsing
Device, when browser needs video device access, it is necessary first to which device address is obtained by monitoring server.Such as：http
Get asks http://www.myserver.com/redirtodeviceId=MyNVR；
Include IP address information, the predetermined port of Client Agent module in the redirection message of monitoring server construction
Number and associated video device parameter of the browser into the request that monitoring server is sent out.For example, redirect the URL of message
Can be：http://localhost:9099/redirtodeviceId=MyNVR.
Browser initiates to ask to this URL：
GET http://localhost:9099/redirtodeviceId=MyNVR
After the request for receiving browser, Client Agent module establishes UDP channel with video equipment proxy module, in addition,
After Client Agent module opens 80 ports as HTTP request of the B receptions in port from client modules, returned to browser
Http response informs the first port and second port newly opened：http://localhost:80/ControlPort=
8081＆VideoPort=8082
Browser sends the HTTP request after redirecting to 80 ports again：
GET http://localhost:80/HTTP/1.1
This request is sent to video equipment proxy module by Client Agent by UDP channel.For distinguish different messages and
The situation of different browsers connection, Client Agent side need to record the message ID number of this situation and connection ID.
Such as：This connection ID=0001, message id=0001, represent transmission is HTTP request, and only there are one clear
Device of looking at connects.Client Agent module will send the message of following form at this time
Message id (4bytes) 0001
Connection ID (4bytes) 0001
Message body GET http://localhost:80/HTTP/1.1
Video equipment proxy module removes message header after receiving the message, establishes and connects with the HTTP server of video equipment
It connects, and is transmitted to the HTTP server of video equipment, forward the message body portion that content can be above-mentioned message, GET
http://localhost:80/HTTP/1.1。
HTTP service module returning response message：200OK is returned to, content is
<！DOCTYPE html>
<html>
<body>
<h1>Welcome</h1>
<p>NVR id is MyNVR.</p>
</body>
</html>
Video equipment proxy module is sent to client after above-mentioned response message is constructed message header again by UDP channel
Proxy module, sending message is
Message id (4bytes) 0001
Connection ID (4bytes) 0001
Message body HTTP/1.1200OK
text/html
<！DOCTYPE html>
<html>
<body>
<h1>Welcome</h1>
<p>NVR id is MyNVR.</p>
</body>
</html>
After Client Agent module will respond stripping message header, message body is sent to client modules, HTTP is completed and disappears
Breath exchanges.The message for issuing client modules is as follows：
HTTP/1.1200OK
text/html
<！DOCTYPE html>
<html>
<body>
<h1>Welcome</h1>
<p>NVR id is MyNVR.</p>
</body>
</html>
The final display content Welcome NVR id is MyNVR of browser.
The video playback module of browser connects Client Agent module, visitor also referring to above-mentioned steps by second port
The content of request is sent to video equipment proxy module after family end proxy module addition message header (message id and connection ID).Depending on
The video server of video equipment is transmitted the message to after frequency proxy for equipment module stripping message header.Video equipment proxy module obtains
Response is sent to Client Agent module after addition message header after must responding, Client Agent module will disappear after removing message header
Breath is sent to client video playback module.Subsequent video proxy for equipment module is sent actual by this echo port second port
Video data.
Those skilled in the art will readily occur to the application its after considering specification and putting into practice invention disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.Description and embodiments are considered only as illustratively, and the true scope and spirit of the application are by following
Claim is pointed out.
It should be appreciated that the precision architecture that the application is not limited to be described above and be shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by appended claim.
Claims (10)
1. a kind of video monitoring system, which is characterized in that including：Monitoring server in public network；Same private is in client
The Client Agent module of net and the video equipment proxy module that same private network is in video equipment, the client and described
Video equipment is located in different private networks；
The monitoring server, for the equipment connection request of the client to be redirected, setting after the redirection
The identification information of standby IP address of the connection request including the Client Agent module, predetermined port and video equipment；
The Client Agent module, please for monitoring the equipment connection after the client redirects from the predetermined port
It asks, UDP channel is established according to the identification information of the video equipment and video equipment proxy module, is turned by the UDP channel
Sending service control information or video data related news；And open first port and second port, by the first port with
The client interacts the business control information, and the video data phase is interacted with the client by the second port
Close message；
The video equipment proxy module, for establishing UDP channel and by the UDP with the Client Agent module
Passage forwarding service control information or video data related news.
2. video monitoring system according to claim 1, which is characterized in that the Client Agent module is additionally operable to opening
After opening the first port, the equipment after the client redirects is returned to the client by the first port and is connected
The response message of request carries the port information of the first port and second port in the response message, passes through the response
Equipment connection request after the redirection is redirected to the first port by message again.
3. video monitoring system according to claim 2, which is characterized in that the Client Agent module passes through described
UDP channel forwarding service control information or video data related news specifically include：
Type of message will be added from the business control information or the message header of video data related news that the client receives
The video equipment proxy module is forwarded to by the UDP channel after mark, the type of message mark is for differentiated service
Control information or video data related news；
It will be separated from the business control information after the encapsulation that the video equipment proxy module receives or video data related news
After message header, the type of message in the message header is identified is sent to the client, the phase by corresponding port
The port answered is first port or second port；
The video equipment proxy module is specific by the UDP channel forwarding service control information or video data related news
Including：
It will disappear from the business control information after the encapsulation that the Client Agent module receives or the separation of video data related news
The video equipment is sent to after breath head；
The business control information received from the video equipment or video data related news are added into the type of message mark
The client is sent to by the UDP channel afterwards.
4. video monitoring system according to claim 3, which is characterized in that connection identifier is further included in the message header,
For when there are during multiple client, distinguishing the connection of different clients.
5. video monitoring system according to claim 1, which is characterized in that the Client Agent module is regarded according to
The identification information of frequency equipment is established UDP channel with video equipment proxy module and is specifically included：
The Client Agent module sends UDP to the monitoring server and establishes request, and the UDP is established in request and carried institute
State the identification information of video equipment；According to the monitoring server return video equipment proxy module address information with it is described
Video equipment proxy module establishes the UDP channel；
The monitoring server be additionally operable to receive the Client Agent module UDP establish request after, set according to the video
The address information of the video equipment proxy module is informed the Client Agent module and by described in by standby identification information
The address information of Client Agent module informs the video proxy module；
The video equipment proxy module establishes UDP channel with the Client Agent module：
The address information of the Client Agent module returned according to the monitoring server is established with the Client Agent module
The UDP channel.
A kind of 6. method of passing through NAT monitor video data, which is characterized in that the network of the method operation is included in public network
Monitoring server；The Client Agent module of same private network is in client and is in regarding for same private network with video equipment
Frequency proxy for equipment module, the client and the video equipment are located in different private networks；
The method includes the steps：
The Client Agent module monitors the equipment connection request after the client redirects from predetermined port, described to reset
The mark of IP address of the equipment connection request backward including the Client Agent module, the predetermined port and video equipment
Information；
UDP channel is established according to the identification information of the video equipment and the video equipment proxy module, and opens first end
Mouthful and second port, by the first port and the client interactive service control information, by the second port and
The client interactive video data related news；
Pass through the UDP channel forwarding service control information or video data related news.
7. according to the method described in claim 6, it is characterized in that, the method further includes：
After the first port is opened, by the first port after the client returns to the client redirection
The response message of equipment connection request carries the port information of the first port and second port, passes through in the response message
Equipment connection request after the redirection is redirected to the first port by the response message again.
8. the method according to the description of claim 7 is characterized in that described pass through the UDP channel forwarding service control information
Or the step of video data related news, specifically includes：
Type of message will be added from the business control information or the message header of video data related news that the client receives
The video equipment proxy module is forwarded to by the UDP channel after mark, the type of message mark is for differentiated service
Control information or video data related news；
It will be separated from the business control information after the encapsulation that the video equipment proxy module receives or video data related news
After message header, the type of message in the message header is identified is sent to the client, the phase by corresponding port
The port answered is first port or second port.
9. according to the method described in claim 8, it is characterized in that, connection identifier is further included in the message header, for that ought deposit
In multiple client, the connection of different clients is distinguished.
10. it according to the method described in claim 6, it is characterized in that, is set according to the identification information of the video equipment with video
Standby proxy module is established UDP channel and is specifically included：
The Client Agent module sends UDP to the monitoring server and establishes request, and the UDP is established in request and carried institute
State the identification information of video equipment；According to the monitoring server return video equipment proxy module address information with it is described
Video equipment proxy module establishes the UDP channel.
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| CN109120491A (en) * | 2017-06-22 | 2019-01-01 | 格局商学教育科技（深圳）有限公司 | It is a kind of for establishing the method and system of direct-connected vpn tunneling in net work teaching system |
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| CN109962990B (en) * | 2017-12-26 | 2022-04-12 | 浙江宇视科技有限公司 | Method and device for automatically accessing monitoring equipment in NAT |
| CN109922378B (en) * | 2019-01-23 | 2021-06-18 | 视联动力信息技术股份有限公司 | Site data processing method and device |
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| CN112995197B (en) * | 2021-03-26 | 2023-05-02 | 苏州科达科技股份有限公司 | Remote access method, system, equipment and storage medium of monitoring equipment |
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