CN101207626A - Control protocol and corresponding remote video supervisory control system - Google Patents
Control protocol and corresponding remote video supervisory control system Download PDFInfo
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Abstract
The invention relates to a control protocol and a corresponding remote video monitoring system, wherein, the control protocol uses a TCP way for transmission in an IP network, and controls the protocol content to adopt an XML pattern; the remote video monitoring system consists of a monitoring front-end (1), a signaling cut-in server(21), a central server (22), a medium cut-in server, a monitoring client end (3), and an IP network, and the control protocol is adopted in the monitoring of the front-end register and the information signaling transmission. The information transmission of the control protocol is instantaneous, and is realized simply and is convenient to be extended, the corresponding remote video monitoring system has the advantages that the signaling-control information response speed is rapid, at the same time, the networking is convenient, the extending is easy, and the load sharing is achieved, thereby increasing the system function.
Description
Technical field
The present invention relates to computer network and multimedia communication, be specifically related to a kind of control protocol and corresponding Active Eyes.
Background technology
Simulation has been experienced in the video monitoring system development, numeral and three developing stage of Network Video Surveillance, and its application is also more extensive, and system scale is also constantly enlarging, and special effect aspect social public security is obvious more and outstanding.But, owing to lack unified industry standard, signaling control protocol in the video monitoring system is unified standard not, market is relatively chaotic, enterprise of every family all does things in his own way, incompatible on the product, there is not open Interface design yet, performances such as reliability of products, stability, autgmentability also can't satisfy various users' demand.
In addition, apply for a patent " a kind of Active Eyes and method " based on Session Initiation Protocol at Chinese invention patent, application number 200610127122, disclose a kind of SIP that is made up of communication network, front end watch-dog, Surveillance center and remote monitoring client, five members of operation supporting platform and use Active Eyes, wherein communication network comprises: IP network, PSTN net, ISDN net and mobile radio communication; This system is the core signaling protocol with open Session Initiation Protocol.
Summary of the invention
The technical issues that need to address of the present invention are how a kind of control protocol and corresponding Active Eyes are provided, thereby make control protocol realize simple more and be convenient to expansion and provide the possibility normative reference for the industry unification, further satisfy message more and transmit instantaneity, and then realize Active Eyes based on this control protocol.
Above-mentioned first technical problem of the present invention solves like this, a kind of control protocol is provided, this control protocol uses the TCP mode to transmit in IP network and the control protocol content adopts the XML form, the control protocol of this self-defining TCP+XML mode, the message that satisfies more in the video monitoring system transmits instantaneity and reliability, and this new signaling control protocol realizes more simply and be convenient to expanding.
According to control protocol provided by the invention, described control protocol comprises message header and message body, and described message body comprises the content that described control protocol is concrete, and content representation adopts the XML form.
According to control protocol provided by the invention, described message header comprises but limiting session sign, type of message, message-length, source do not identify and the destination identification field.
According to control protocol provided by the invention, described message header also comprises beginning flag, version information, control, reservation and CRC check field.
According to control protocol provided by the invention, described control protocol comprises but does not limit and is applied in Active Eyes, video conferencing system or the network instant communication system.
Above-mentioned another technical problem of the present invention solves like this, a kind of Active Eyes is provided, form by front monitoring front-end, signaling access server, central server, medium access server, monitor client and IP network, in registration of this supervisory control system front monitoring front-end and the transmission of monitoring message signaling, adopt and use the TCP mode to transmit and the control protocol of control protocol content employing XML form.
According to supervisory control system provided by the invention, this supervisory control system also is included in the heartbeat of setting up between described central server and the signaling access server and is connected.
According to supervisory control system provided by the invention, this front monitoring front-end that this supervisory control system also comprises front monitoring front-end foundation when registration, the back active of succeeding in registration disconnects is connected with the TCP between the described central server, that is: TCP short chain road.
According to supervisory control system provided by the invention, the TCP that this supervisory control system also is included in the employing timed sending keep-alive message mechanism of setting up between described front monitoring front-end and the signaling access server is connected, that is: TCP long-chain road; Described keep-alive message mechanism only comprises just thinks front monitoring front-end thoroughly and the signaling access server disconnection after several times do not receive the keep-alive message of front monitoring front-end within keepalive period continuously, described several times include, but are not limited to three times.
According to supervisory control system provided by the invention, described IP network is an Internet; Described signaling access server and central server have public network IP address, that is: Internet IP address; Described front monitoring front-end and monitor client have public network IP address, perhaps do not have public network IP address (be positioned at private network and have private network IP address) but pass through gateway/fire compartment wall to connect public network.
According to supervisory control system provided by the invention, described signaling access server and central server are positioned at the public network side, perhaps are in the private network but have public network IP address by the NAT mapping.
According to supervisory control system provided by the invention, this supervisory control system also is included in the RTSP that sets up between described front monitoring front-end and the medium access server and is connected.
According to supervisory control system provided by the invention, the quantity of described signaling access server is definite by this supervisory control system capacity (front monitoring front-end sum), and can carry out unified monitoring by central server, finishes load sharing.
According to supervisory control system provided by the invention, described monitor client quantity directly connects central server after a little while.
Control protocol provided by the invention and corresponding Active Eyes, adopt the control protocol of TCP+XML mode, control protocol message transmission instantaneity and realization are simply expanded with being convenient to, further adopt this control protocol to compare, have following advantage with the Active Eyes that adopts other control protocols:
1, signaling control messages response speed is fast, front monitoring front-end and monitor client and video monitoring system have been set up TCP long-chain road respectively, what guaranteed that the signaling control messages can be accurately instant transmits between front monitoring front-end and monitor client, can notify monitor client immediately for the abnormality alarming information of front monitoring front-end especially.
2, front monitoring front-end and monitor client in advance and signaling access server set up the TCP link, even front monitoring front-end and monitor client are in private network inside, the control signaling still can transmit.
3, with the continuous increase of front monitoring front-end quantity, this video monitoring system only need be carried out dilatation to signaling access server, and the quantity of simple superposition signaling access server just can be carried out System Expansion very easily.(also needing certainly the medium access server is carried out dilatation)
4, any signaling access server breaks down in the system, and front monitoring front-end can find new signaling access server to insert at short notice.
5, central server is unified global administration to all signaling access servers, and dynamically realizes load balancing, makes the performance of the front monitoring front-end connecting system in the whole video supervisory control system reach optimum.
Description of drawings
Further the present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is Active Eyes application deployment figure of the present invention;
Fig. 2 is front monitoring front-end access process figure;
Fig. 3 is monitor client access process figure;
Fig. 4 is the cradle head control flow chart;
Fig. 5 is the alarm notification flow chart;
Embodiment
At first, key of the present invention is described:
(1) control protocol message header field contents definition:
The beginning flag field: 2 byte lengths, the beginning flag of control protocol message header, after receiving terminal was received control messages, whether the beginning flag of at first judging message consistent with definition, if inconsistent, thinks that then control messages is wrong, directly abandons.
The version information field: 2 byte lengths, the control protocol version definition is after agreement is upgraded after being convenient to, to the compatibility of old agreement
Message type field: 2 byte lengths, indicate the content format of control messages.
Message length field: 2 byte lengths comprise the total length of message header and message body (XML content).Receiving terminal is handled subpackage and sticking bag phenomenon in the TCP transmission course by this field, correct obtains a complete control messages content.
Session identity fields: 2 bytes, produce by the control messages initiator, session uniqueness sign, the session identification in the response message head is consistent with sign in the request message.
The source identification field: 20 bytes, the unique identification in transmission source can identify unique definite transmission source by this, and receiving terminal is resolved the transmission source identification information in the message header, and echoes for the transmission source and answer message.
Destination identification field: 20 bytes, send the destination unique identification, identify unique definite transmission destination by this, after receiving terminal receives control messages, whether be itself, answer message if echo itself could in the message header transmission source if need to judge sending the destination.
Control field: 1 byte, message content is encrypted, the definition of compression control flag bit
Reserved field: 1 byte keeps for later expansion.
The CRC check field: 4 bytes are carried out verification to the content of whole message header, and the prevention and control agreement mistake occurs at network transmission process.
(2) the main flow process of monitoring remote video
1. after front monitoring front-end (or claiming the front end video server) powers on, initiatively set up the TCP link, and adopt control protocol form defined above to send register requirement to the central server device to the Active Eyes central server.
2. the video monitoring central server carries out authentication to front monitoring front-end, after the authentication success, according to the dispatching platforms strategy, for front monitoring front-end distributes control signaling access server and medium access server.
3. after the front monitoring front-end authentication success, according to signaling access server that returns and medium access server, the subsequent request (streaming media server) of reach the standard grade respectively registration and Media Stream.Adopt TCP long-chain road between front monitoring front-end and the signaling access server, control protocol adopts form defined above.Adopt existing RTSP mode to insert between front monitoring front-end and the medium access server.
4. signaling access server receives the request of front monitoring front-end, and returns response message, simultaneously the access information of front monitoring front-end is in time reported the video monitoring system central server, and central server is written to information in the database.
If it is unusual that 5. front monitoring front-end detects the link appearance, need carry out retry, if after continuous three retries failure, jump to step and 2. carry out
6. monitor client adopts TCP long-chain road to insert video monitoring central server system, control protocol also adopts form defined above, central server carries out after the authentication, and from database tabulation of the front monitoring front-end of supervisory user and presence information thereof is returned to monitor client.
When 7. monitor client was controlled front monitoring front-end, monitor client directly transmitted control message to the signaling access server that front monitoring front-end inserts according to the access server address of the front monitoring front-end in the watch-list.Adopt TCP short chain road this moment between monitor client and the signaling access server, the form of timing above control protocol adopts, and TCP short chain road is maintained to the response message that monitor client receives front monitoring front-end.
When 8. front monitoring front-end has unexpected message to be notified to monitor client, front monitoring front-end is at first given signaling access server message informing, be transmitted to the video monitoring system central server by signaling access server, central server is transmitted to monitor client as required, and the notice monitor client is handled accordingly.
9. between signaling access server and the central server heartbeat message is arranged, central server can be known the state of signaling access server in real time
If 10. the signaling access server of front monitoring front-end breaks down (as the machine of delaying), front monitoring front-end does not insert signaling access server continuous three times, needs again to central server demand signalling access server address.Central server selects a signaling access server to return to front monitoring front-end from normal signaling access server, and the strategy of selection can be by multiple mode.
In second step, the concrete Active Eyes of the present invention is described:
In the concrete enforcement environment as shown in Figure 1, video monitoring system service platform 2, comprise signaling access server 21 and central server 22, be in the public network side, also can be in the private network, have public network IP by the NAT mapping then, front monitoring front-end 1 and monitor client 3 concrete distributions are unrestricted, can be distributed in (by fire compartment wall 4 connection public networks) under the private network, also can be distributed under the public network, as long as it can normally insert the Internet.
In the Active Eyes, front monitoring front-end 1 quantity will be much larger than the quantity of monitor client 3, so the front monitoring front-end 1 among Fig. 1 adopts distributed way, be linked in the signaling access server 21, monitor client 3 quantity compare less, can directly be linked on the central server 22, when monitor client 3 quantity reach certain quantity, can consider to adopt the access way of similar front monitoring front-end to carry out the distributed deployment mode.
The 3rd step,, specific as follows with the control signaling process that representative four flow processs of enumerating below are the concrete Active Eyes of example brief description the present invention:
(1) the front monitoring front-end login process comprises following concrete steps as shown in Figure 2:
201) front monitoring front-end 1 is set up TCP short chain road to central server 22, send login request message, message adopts self-defining protocol message head to add XML control signaling format, the message header content can be filled in according to defined above, message content (being the content of XML) mainly comprises user name, password, some information such as timestamp.
202) central server 22 is received at first taking-up transmission source sign from message header of data, and judge concrete message body content according to the type of message in the message header, simultaneously to message body ground XML resolve, authentication, if the authentication success then selects a signaling access server to return to front monitoring front-end from signaling access server 21 ponds.
203) front monitoring front-end 1 is received after the registration reply message, and initiatively the TCP link of disconnection and central server 22 obtains signaling access server 21 from response message, and sets up TCP long-chain road to signaling access server 21, sends the request message of reaching the standard grade.Signaling access server 21 receives request message, message header and XML are resolved, and return results, simultaneously the presence of front monitoring front-end 1 is notified to central server 22, central server 22 writes in the database, if have online monitor client 3 that this front monitoring front-end is had authority this moment, then notify monitor client 3 these front monitoring front-ends 1 to reach the standard grade.
204) after front monitoring front-end 1 is reached the standard grade, regularly send keep-alive message, keep TCP long-chain road to signaling access server 21.If signaling access server 21 is not received keep-alive message then is thought that front monitoring front-end 1 has rolled off the production line within continuous three keepalive periods.
Wherein in step 202) in, select the signaling access server strategy that multiple mode is arranged, a kind of employing ownership and dependence mode, the preferential ownership access server of selecting, if the ownership access server goes wrong, then select to rely on access server, also the access server of current performance optimum is selected in the decision of the performance of with good grounds access server.
(2) the monitor client login process comprises following concrete steps as shown in Figure 3:
301) monitor client 3 is set up TCP long-chain road to central server 22, send login request message, message adopts self-defining TCP message header to add XML control signaling format, the message header content can be filled in according to defined above, message content (being the content of XML) mainly comprises user name, password, some information such as timestamp.Central server 22 receives that data at first get transmission source sign from message header, and judges concrete message body content according to the type of message in the message header, simultaneously to message content resolve, authentication, and return authenticating result.
302) monitor client 3 is received registration reply message and is resolved, after obtaining the authentication success, send the watch-list request of obtaining to central server 22, central server 22 has this user the watch-list of authority to return to monitor client 3, the information spinner of watch-list will comprise front monitoring front-end 1 presence, the essential information of signaling access server 21 addresses and front monitoring front-end 1.
303) monitor client 3 regularly sends keep-alive message to central server 22, keeps TCP long-chain road.
(3) the cradle head control flow process comprises following concrete steps as shown in Figure 4:
When 401) monitor client 3 is controlled the The Cloud Terrace of front monitoring front-ends 1, at first setting up the TCP short chain with the signaling access server 21 of front monitoring front-end 1 access connects, the address of signaling access server 21 is that monitor client 3 obtains from watch-list information, after connecting, monitor client 3 sends cradle head control message to signaling access server 21 by short connection of TCP.Wherein cradle head control message adopts TCP+XML mode defined above, sign is the unique identification of monitor client 3 in message header transmission source, sending the destination is front monitoring front-end 1 unique identification, type of message is a cradle head control message, message body is in XML, at least need to comprise cradle head control type, fields such as direction among the XML.
402) signaling access server 21 is inquired about the front monitoring front-end link of current access according to the destination in the TCP message header, and gives front monitoring front-end 1 cradle head control message by the TCP long-chain road that front monitoring front-end 1 and signaling access server 21 are set up.Signaling access server 21 does not need to resolve the content of concrete message body XML, only just can transmit very easily according to the content of message header
403) front monitoring front-end 1 is resolved cradle head control message, handle, receive and send the cradle head control response after handling and by the TCP long-chain, wherein the session identification of session identification in the response message head and request is consistent, send destination monitor client sign, at this moment transmission source sign should be front monitoring front-end itself.
404) the transmission destination in the signaling access server 21 parsing TCP message headers is directly transmitted message and is given monitor client 3.Signaling access server does not need to resolve concrete XML content 21 this moments yet, and signaling access server 21 just can be realized the message transparent transmission by message header like this.Monitor client 3 is received after the message, needs the TCP link of active port and signaling access server 21, discharges link circuit resource.
(4) alarm notification flow process as shown in Figure 5, concrete steps are as follows:
501) front monitoring front-end 1 produces after the alarm, by the TCP long-chain road set up with signaling access server 21 having message header and the message body alarm information sends to signaling access server 21.Wherein at this moment the transmission destination in the message header can be left empty, because this moment, front monitoring front-end 1 did not know concrete alarm information need send to which monitor client 3.
502) signaling access server 21 is received the message that front monitoring front-end 1 sends, judge it is the alarm request message by type of message in the message header, signaling access server 21 itself is formed the XML content of alarm response, and according to other fields such as session identification in the request message head, fill in corresponding response message header field, and return response for front monitoring front-end 1 by TCP long-chain road.
503) signaling access server 21 is given after 1 time alarm response of front monitoring front-end, directly is transmitted to central server 22 by the inner link with central server 22 foundation.
504) central server 22 is received after the message, and echoing for signaling access server 21 should
505) central server 22 is resolved the XML content in the message simultaneously, and Query Database, needing to obtain the monitor client TCP long-chain road of notice, and by this TCP long-chain road alarm notification is sent to monitor client 3.
506) monitor client 3 is received after 22 times alarm notifications of central server, by TCP long-chain road, and adds that according to the message header of definition XML message body gives 22 times alarm notifications of central server response.
So just finished from front end and alarmed the complete procedure that client is received a crime report, warning information has only passed through twice forwarding in this process, and the link of transmitting all is to set up in advance, short from alarming to the response time of receiving a crime report, and do not need to consider monitor client Intranet the time can't receive alarm notification.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a control protocol is characterized in that, this control protocol uses the TCP mode to transmit in IP network and the control protocol content adopts the XML form.
2. according to the described control protocol of claim 1, it is characterized in that described control protocol comprises message header and message body, described message body comprises described control protocol content.
3. according to the described control protocol of claim 2, it is characterized in that described message header comprises session identification, type of message, message-length, source sign and destination identification field.
4. according to the described control protocol of claim 1, it is characterized in that described control protocol is applied in Active Eyes, video conferencing system or the network instant communication system.
5. Active Eyes, form by front monitoring front-end (1), signaling access server (21), central server (22), medium access server, monitor client (3) and IP network, it is characterized in that, in front monitoring front-end registration and the transmission of monitoring message signaling, adopt and use the TCP mode to transmit and the control protocol of control protocol content employing XML form.
6. according to the described supervisory control system of claim 1, it is characterized in that this supervisory control system also is included in the heartbeat of setting up between described central server (22) and the signaling access server (21) and is connected.
7. according to the described supervisory control system of claim 1, it is characterized in that this front monitoring front-end (1) that this supervisory control system also comprises front monitoring front-end (1) foundation when registration, the back active of succeeding in registration disconnects is connected with the TCP between the described central server (22).
8. according to the described supervisory control system of claim 1, it is characterized in that the TCP that this supervisory control system also is included in the employing timed sending keep-alive message mechanism of setting up between described front monitoring front-end (1) and the signaling access server (21) is connected; Described keep-alive message mechanism only comprises thinks just that after several times do not receive the keep-alive message of front monitoring front-end within keepalive period continuously front monitoring front-end thoroughly and the signaling access server disconnection.
9. according to the described supervisory control system of claim 1, it is characterized in that, described IP network is an Internet, described signaling access server (22) and central server (21) have public network IP address, and described front monitoring front-end (1) has public network IP address with monitor client (3) or do not have public network IP address but be connected public network by gateway/fire compartment wall.
10. according to the described supervisory control system of claim 9, it is characterized in that described signaling access server (22) and central server (21) are positioned at the public network side, perhaps be in the private network but have public network IP address by the NAT mapping.
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| CN2007101952740A CN101207626B (en) | 2007-12-05 | 2007-12-05 | Remote video frequency monitoring method and system |
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