CN104469315A - CDN-based video data stream transmission method, device and system - Google Patents
CDN-based video data stream transmission method, device and system Download PDFInfo
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Abstract
The invention provides a CDN-based video data stream transmission method applied to front-end monitoring equipment. The method is characterized by comprising the steps that firstly, the front-end monitoring equipment receives service request messages sent by monitoring client-side devices and forwarded by a CDN server, wherein the service request messages carry channel identifiers, corresponding to service requests, of the front-end monitoring equipment; secondly, video data streams are encapsulated according to the channel identifiers, and the channel identifiers are carried in the video data streams; thirdly, the front-end monitoring equipment establishes a single session with the CDN server and transmits the encapsulated video data streams to the CDN server, and the CDN server forwards the video data streams to egress routing devices on the monitoring client-side device sides so as to make the egress routing devices send the video data streams to the monitoring client-side devices according to the channel identifiers. By means of the method, the cost for data transmission through a CDN network is lowered, and meanwhile network resource consumption is reduced.
Description
Technical field
The application relates to technical field of video monitoring, particularly relates to transmission of streams of video data method, Apparatus and system based on CDN.
Background technology
In video monitoring system, in order to ensure the response speed to the video request that user sends, CDN (Content Delivery Network, content distributing network) network is usually utilized to carry out video data transmission.
CDN is one deck intelligent virtual network on existing Internet basic, and its basic ideas avoid the Internet likely affects bottleneck and the link of data transmission bauds and stability as far as possible, make content delivery sooner, more stable.CDN by arranging node server everywhere at network, by the request of user guiding from the nearest node server of user, to make user can obtain required content nearby, improves the response speed to user's request.
In video monitoring system, NVR (Network Video Recorder, network hard disk video recorder) session can be set up according to its IPC comprised (IP Camera, web camera) number of channels and CDN server, and CDN is charged according to number of sessions, therefore, along with increasing of IPC, the session between NVR and CDN server can get more and more, and corresponding expense can get more and more, meanwhile, the consumption of a large amount of Internet resources is also caused.
Summary of the invention
In view of this, this application provides a kind of transmission of streams of video data method based on CDN, be applied on monitoring frontend, the method comprises:
Receive the service request message of the monitor client equipment transmission that CDN server forwards, in described service request message, carry the gap marker of described monitoring frontend corresponding to described service request;
According to described gap marker encapsulate video data flow, in described video data stream, carry described gap marker;
Single session is set up with described CDN server, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards, send described video data stream according to described gap marker to described monitor client equipment to make described outlet routing device.
Present invention also provides a kind of transmission of streams of video data method based on CDN, be applied in the supervisory control system based on CDN, the method comprises:
Monitoring frontend receives the first service request message of the first monitor client equipment transmission that CDN server forwards, and carries the first passage mark of described monitoring frontend corresponding to described first service request in described first service request message;
Described monitoring frontend, according to described first passage mark encapsulate video data flow, carries described first passage mark in described video data stream;
Described monitoring frontend and described CDN server set up single session, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards;
Described outlet routing device receives described video data stream;
Described outlet routing device obtains described first passage mark from described video data stream;
Described Exit Road is by the corresponding relation list item that whether there is described first passage mark in equipment query route program request allocation table, and described route program request allocation table stores the corresponding relation that described first passage identified and asked the first monitor client equipment of described first passage video data stream;
When there is the corresponding relation list item of described first passage mark, described outlet routing device sends described video data stream to described first monitor client equipment.
Present invention also provides a kind of transmission of streams of video data device based on CDN, be applied on monitoring frontend, this device comprises:
Receiving element, the service request message that the monitor client equipment forwarded for receiving CDN server sends, carries the gap marker of described monitoring frontend corresponding to described service request in described service request message;
Encapsulation unit, for according to described gap marker encapsulate video data flow, carries described gap marker in described video data stream;
Transmitting element, for setting up single session with described CDN server, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards, send described video data stream according to described gap marker to described monitor client equipment to make described outlet routing device.
Present invention also provides a kind of transmission of streams of video data system based on CDN, this system comprises:
Monitoring frontend, the first service request message that the first monitor client equipment forwarded for receiving CDN server sends, carries the first passage mark of described monitoring frontend corresponding to described first service request in described first service request message; According to described first passage mark encapsulate video data flow, in described video data stream, carry described first passage mark; Set up single session with described CDN server, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards;
Outlet routing device, for receiving described video data stream; Described first passage mark is obtained from described video data stream; Whether there is the corresponding relation list item of described first passage mark in query routing program request allocation table, described route program request allocation table stores the corresponding relation that described first passage identified and asked the first monitor client equipment of described first passage video data stream; When there is the corresponding relation list item of described first passage mark, send described video data stream to described first monitor client equipment.
The application carries out transmission of streams of video data by single session between monitoring frontend and CDN server, by carrying the gap marker of monitoring frontend in video data stream, distinguish the video data stream of different passage, thus save the expense utilizing CDN to carry out video data transmission, meanwhile, network resource consumption is reduced.
Accompanying drawing explanation
Fig. 1 is the supervisory control system schematic diagram based on CDN in prior art;
Fig. 2 is the supervisory control system schematic diagram based on CDN in the application;
Fig. 3 is the process chart based on the transmission of streams of video data method of CDN in a kind of embodiment of the application;
Fig. 4 is the process chart based on the transmission of streams of video data method of CDN in the another kind of embodiment of the application;
Fig. 5 is the underlying hardware schematic diagram based on the transmission of streams of video data device of CDN in a kind of embodiment of the application;
Fig. 6-1 is the structural representation of the transmission of streams of video data device based on CDN in the application's embodiment;
Fig. 6-2 is structural representations of the transmission of streams of video data device based on CDN in another embodiment of the application;
Fig. 7 is the structural representation of the transmission of streams of video data system based on CDN in the application's embodiment.
Embodiment
For making the object of the application, technical scheme and advantage clearly understand, referring to accompanying drawing, scheme described in the application is described in further detail.
Figure 1 shows that the supervisory control system schematic diagram based on CDN in prior art.This supervisory control system comprises web camera (IPC1 ~ IPC5), network hard disc CD writer (NVR1, NVR2), CDN server, router (RT1, RT2) and main frame (PC1 ~ PC3).Wherein, the collection of video data is responsible for by web camera, and sent to by video data network hard disc CD writer to carry out storage and the forwarding of video data.When main frame needs to check video data, obtain the video data needed by accesses network hard disk recorder, wherein, the corresponding web camera of each passage of network hard disc CD writer.For PC1, when PC1 asks live IPC1 and IPC2 live, this request is forwarded to NVR1 by CDN server, NVR1 sets up two session N1_1 and N1_2 according to the number of channels (IPC1 and IPC2) of request and CDN server, transmit the video of IPC1 and the video of IPC2 respectively, in like manner, also need to set up two session P1_1 and P1_2 between RT1 and PC1, realize the transmission of two-path video.
Charging due to CDN is charged according to the number of sessions set up between the network equipment and CDN server, therefore, along with the continuous expansion of supervisory control system, IPC passage progressively increases, the expense adopting prior art will inevitably cause bringing because number of sessions increases is long-pending to be increased, meanwhile, also consumes a large amount of Internet resources.
For the problems referred to above, the embodiment of the present application proposes a kind of transmission of streams of video data method based on CDN, the method at monitoring frontend (such as, NVR) and between CDN server transmission of streams of video data is carried out by single session, by carrying the gap marker of monitoring frontend in video data stream, distinguish the video data stream of different passage, thus realize the transmission of streams of video data based on CDN.
See Fig. 2, it is the supervisory control system schematic diagram based on CDN in the application.Specific implementation process is see Fig. 3, and for the application is based on an embodiment flow chart of the transmission of streams of video data method of CDN, this embodiment is described from monitoring frontend side to the transmission of streams of video data process based on CDN.
Step 310, receives the service request message of the monitor client equipment transmission that CDN server forwards, carries the gap marker of described monitoring frontend corresponding to described service request in described service request message.
In supervisory control system, service request is initiated by monitor client equipment usually.Carry out in the supervisory control system of transmission of streams of video data utilizing CDN, CDN server preserves the topological structure of whole supervisory control system, monitor client equipment carries out service message interaction and transmission of streams of video data by CDN server and monitoring frontend, the passage one_to_one corresponding of each IPC and monitoring frontend, such as, IPC1 is connected on the passage T1 of NVR1; IPC2 is connected on the passage T2 of NVR1; IPC3 is connected on the passage T3 of NVR1.Monitor client equipment is realized by the video data reading NVR respective channel the access of IPC.
First, monitor client equipment sends service request message to CDN server, and in the message body (usual monitor client equipment communicates with adopting private message between CDN server) of this service request message inside, carry the gap marker of the monitoring frontend of request, so that monitoring frontend can Acquisition channel mark.This is that CDN server may change the outer envelope of service request message because service request message is when forwarding through CDN server, so, carry gap marker by service request message inside, can ensure that monitoring frontend obtains lane identification information.
After CDN server receives the service request message of monitor client equipment transmission, by this service request message repeating to the monitoring frontend of monitor client device request.Monitoring frontend obtains gap marker corresponding to service request from this service request message, performs step 320.
Step 320, according to described gap marker encapsulate video data flow, carries described gap marker in described video data stream.
The video data corresponding with this passage, according to the gap marker obtained, encapsulates, and is encapsulated in video data stream by this gap marker by monitoring frontend.When video data encapsulates, UDP (User Datagram Protocol, User Datagram Protocol) can be adopted to carry, and after completing UDP encapsulation, carry out the encapsulation of IP layer, in Option (option) field in IP packet header, add gap marker.Such as, when carrying out video data encapsulation to the T2 passage of NVR1, the T2 of gap marker NVR1 is added to the Option field in IP packet header.
Step 330, single session is set up with described CDN server, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards, send described video data stream according to described gap marker to described monitor client equipment to make described outlet routing device.
Monitoring frontend is after completing video data stream encapsulation, and without the need to setting up multiple session according to the difference of passage and CDN server, the video data stream of different passage can send to CDN server by same session.Whether video data stream is transmitted to the outlet routing device of monitor client side by CDN server, determined to monitor client device forwards according to the gap marker of the monitoring frontend carried in video data stream by outlet routing device.
In the step 310, except carrying the gap marker of monitoring frontend in the service request message that monitoring frontend receives, also carry service request type, monitor client mark and ageing time, wherein, monitor client mark can be the information uniquely representing this monitor client equipment, as IP (Internet Protocol, Internet protocol) address, MAC (Media Access Control, medium access control) address, CPU (Central Processing Unit, central processing unit) string number etc.In order to make description clearly understand in the embodiment of the present application, the name of the monitor client equipment marked in Fig. 2 is used to be referred to as client identification.Such as, PC1 asks the fact of IPC2, then the monitor client in service request message is designated PC1.
After monitoring frontend obtains above-mentioned information, first judge service request type, according to different judged results, point following two kinds of situations process:
When service request type is order request, the corresponding relation list item of monitor client mark, gap marker and ageing time is added in front end program request allocation table.For NVR1, after NVR1 receives the service request message of the request program request IPC2 that PC1 sends, from business request message, Acquisition channel is designated the T2 of NVR1, and client identification is PC1, then preserve the corresponding relation of T2 and the PC1 of NVR1, as shown in table 1.
Table 1
Table 1 is front end program request allocation table example.Wherein, the last item list item is the corresponding relation list item of PC1 program request IPC2.When monitoring frontend receives new order request at every turn, all upgrade front end program request allocation table, to determine the actual service condition of each passage.
In the embodiment of the present application, monitoring frontend can by the mode of periodic detection front end program request allocation table, and the video data corresponding to the gap marker in front end program request allocation table encapsulates.Choose each gap marker in front end program request allocation table successively.Carry out video data stream encapsulation respectively according to each gap marker, and in video data stream, carry corresponding gap marker.For table 1, there is order request in passage T1 and T2 of NVR1, and NVR1 order chooses T1 and T2, is encapsulated respectively by the video data of passage T1 and T2, and the Option field in the IP packet header of the video data stream of T1 adds the T1 of gap marker NVR1; Option field in the IP packet header of the video data stream of T2 adds the T2 of gap marker NVR1.
When service request type is for breaking request, monitoring frontend inquiry front end program request allocation table.Delete the corresponding relation list item of monitor client mark and gap marker in front end program request allocation table, when current endpoint broadcasts the corresponding list item without gap marker in allocation table, when namely there is no this passage of monitor client equipment program request, monitoring frontend stops encapsulating the video data of this passage, no longer sends video data stream corresponding to this passage to CDN server.
Certainly, if monitor client equipment breaks request owing to extremely not sending, also by making regular check on the mode of front end program request allocation table, the corresponding relation list item of monitor client mark and the gap marker reaching ageing time can be deleted.This is due to monitor client equipment meeting timed sending order request, and ageing time is carried in order request, if monitoring frontend does not receive the order request that monitor client equipment sends again in ageing time, do not receive and break request yet, so, monitoring frontend after ageing time arrives, can delete the corresponding list item in front end program request allocation table.When current endpoint broadcasts the corresponding list item without gap marker in allocation table, monitoring frontend stops encapsulating the video data of this passage, no longer sends video data stream corresponding to this passage to CDN server.
Known by foregoing description, along with increase or the minimizing of demand (telecommunication) service, the list item in front end program request allocation table can change.Monitoring frontend according to the gap marker in front end program request allocation table, can increase or reduce the video data stream of respective channel.The video data corresponding to the gap marker in front end program request allocation table encapsulates, and does not have the video data of the passage of program request can not send to monitor client equipment.Such as, in table 1, there is no the order request of the T3 of passage NVR1, therefore, video data corresponding for the T3 passage of NVR1 can not be sent to monitor client equipment, thus avoid the waste of Internet resources.
See Fig. 4, for the application is based on another embodiment flow chart of the transmission of streams of video data method of CDN, this embodiment is described from the angle of the supervisory control system based on CDN the transmission of streams of video data process based on CDN.
Step 410, monitoring frontend receives the first service request message of the first monitor client equipment transmission that CDN server forwards, and carries the first passage mark of described monitoring frontend corresponding to described first service request in described first service request message.
See the description of step 310, do not repeat them here.
Step 420, described monitoring frontend, according to described first passage mark encapsulate video data flow, carries described first passage mark in described video data stream.
See the description of step 320, do not repeat them here.
Step 430, described monitoring frontend and described CDN server set up single session, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards.
See the description of step 330, do not repeat them here.
Step 440, described outlet routing device receives described video data stream.
Step 450, described outlet routing device obtains described first passage mark from described video data stream.
Known in the foregoing written description, first passage mark can be added in the video data stream of encapsulation by the Option field in IP packet header by monitoring frontend.Outlet routing device can identify IP packet header as three-layer equipment, obtains first passage mark from Option field.
Step 460, described Exit Road is by the corresponding relation list item that whether there is described first passage mark in equipment query route program request allocation table, and described route program request allocation table stores the corresponding relation that described first passage identified and asked the first monitor client equipment of described first passage video data stream.
A route program request allocation table is maintain, the program request record of all monitor client equipment under have recorded this outlet routing device in this route program request allocation table in outlet routing device.
| Monitor client identifies | Gap marker | Ageing time |
| PC1 | The T1 of NVR2 | 5s |
| PC2 | The T1 of NVR1 | 5s |
Table 2
Table 2 is the route program request allocation table example on outlet routing device RT1.Wherein, Article 1 list item represents that PC1 asks the video data of the T1 passage of program request NVR2; Article 2 list item represents that PC2 asks the video data of the T1 passage of program request NVR1.
Owing to there is above-mentioned route program request allocation table in outlet routing device, therefore, outlet routing device is when receiving the video data stream that monitoring frontend returns, according to the first passage identified query route program request allocation table obtained from video data stream, under judging this outlet routing device, whether can there is the first monitor client equipment program request video data of this first passage.
Step 470, when there is the corresponding relation list item of described first passage mark, described outlet routing device sends described video data stream to described first monitor client equipment.
When there is the corresponding relation list item of first passage mark in route program request allocation table, namely there is this passage of the first monitor client equipment program request under exporting routing device, then export routing device sends video data stream from this first passage to this first monitor client equipment.When exporting routing device and sending video data stream to the first monitoring customer equipment, even if the first monitor client equipment program request video data of multiple passage, also only need to set up a session between outlet routing device and the first monitor client equipment, multichannel video data can be sent to the first monitor client equipment by this session.First monitor client equipment can distinguish different video datas by the first passage mark in video data stream.
When there is not the corresponding relation list item of first passage mark in route program request allocation table, namely this passage of the first monitor client equipment program request is not had under exporting routing device, then egress router can not forward this video data stream to Intranet, thus avoids the waste of Intranet resource.
Outlet routing device, when receiving the first service request message that the first monitor client equipment sends, upgrades route program request allocation table.First monitor client equipment not only carries the information such as service request type, the first monitor client mark, first passage mark and ageing time in the inside of the first service request message, also above-mentioned information is carried at the Option field in IP packet header.Outlet routing device obtains above-mentioned information as three-layer equipment by the Option field in identification IP packet header.
First judge service request type, according to different judged results, point following two kinds of situations process:
When service request type is the first order request, first monitor client identifies by outlet routing device, first passage identifies and the corresponding relation list item of described ageing time adds in route program request allocation table, so that when receiving the video data stream that monitoring frontend returns, inquire about corresponding first passage list item, video data stream is transmitted to the first monitor client equipment.
When service request type is for breaking request, query routing program request allocation table, find the first passage mark asking to break, the first monitor client mark of asking to break deleted from route program request allocation table with the corresponding relation list item that first passage identifies, outlet routing device no longer sends the video data stream of first passage to the first monitor client equipment.
Certainly, if the first monitor client equipment breaks request owing to extremely not sending, also by making regular check on route program request allocation table, can delete and reaching the corresponding relation list item that in the route program request allocation table of ageing time, the first monitor client mark identifies with first passage.Concrete processing procedure see the description of aforementioned monitoring frontend side, can not repeat them here.
In order to improve the utilance of Internet resources further, can optimize further between outlet routing device and CDN server.In the foregoing written description, outlet routing device has set up the corresponding relation list item of the first monitor client equipment and first passage in route program request allocation table, carries out the transmission of first passage video data.Now, if outlet routing device receives the second service request message that the second monitor client equipment sends, and the first passage video of the second channel video of this second service request message request and the first monitor client device request is positioned on same monitoring frontend, then export routing device can obtain this monitoring frontend first passage mark by query routing program request allocation table, this first passage mark is added in the second service request message and sends to CDN server.
This second service request message is sent to monitoring frontend by CDN server, monitoring frontend carries out video data stream encapsulation respectively according to first passage mark and second channel mark and returns to CDN server, CDN server can by with export routing device second session of setting up by above-mentioned video data stream to egress router.This second session is set up when the second monitor client equipment initiates the second service request.
After outlet routing device receives above-mentioned video data stream, according to the gap marker query routing program request allocation table carried in video data stream, carry out video data flow forwarding.It should be noted that, outlet routing device, when receiving the second service request message, can upgrade the local route program request allocation table preserved, for the route program request allocation table on RT1, as shown in table 3.
| Monitor client identifies | Gap marker | Ageing time |
| PC1 | The T1 of NVR1 | 5s |
| PC2 | The T2 of NVR1 | 5s |
Table 3
Wherein, Article 1 list item is the corresponding relation list item example that the first passage mark set up in outlet routing device identifies with the first monitor client; Article 2 list item is after outlet routing device receives the second service request message, the example of the corresponding relation list item that the second channel mark of foundation and the second monitor client identify.As can be known from Table 3, PC1 crosses video data stream to the T1 channel request of NVR1, and now, PC2 also initiates video request to NVR1, and the passage of request is the T2 passage of NVR1.
When exporting routing device and receiving the video data stream of carrying first passage mark, in query routing program request allocation table, the corresponding relation list item of first passage mark, gives the first monitor client equipment by the video data stream of first passage; When exporting routing device and receiving the video data stream of carrying second channel mark, in query routing program request allocation table, the corresponding relation list item of second channel mark, gives the second monitor client equipment by the video data stream of second channel.
Because monitor client equipment regularly can send service request message, when exporting routing device and again receiving the first service request message of the first monitor client equipment transmission, no longer send this first service request message to CDN server, after a period of time has passed, the first conversation between CDN server and outlet routing device, this first session is that the first monitor client equipment is set up when initiating the first service request.When after the first conversation, only there is the video data stream of second session to same monitoring frontend between CDN server and outlet routing device and transmit, thus decrease the resource consumption between CDN server and outlet routing device.
Now still for Fig. 2, introduce the transmission of streams of video data processing procedure based on CDN in detail.
In Fig. 2, IPC1 ~ IPC3 is connected on T1 ~ T3 passage of NVR1, and IPC4, IPC5 are connected on T1, T2 passage of NVR2.Suppose that PC1 asks the fact of program request IPC1, PC1 sends service request message to CDN server, PC1 in the message body (usual monitor client equipment communicates with adopting private message between CDN server) of this service request message inside and IP packet header Option field adds service request type respectively, monitor client identifies, the gap marker of monitoring frontend.Wherein, service request type is order request, and monitor client is designated PC1, and gap marker is the T1 of NVR1.
First this service request message arrives outlet routing device RT1, RT1 can only identify IP layer information as three-layer network appliance, therefore, can by intercepting the Option field in the IP packet header of service request message, the service request type getting this service request message from Option field is order request, monitor client is designated PC1, gap marker is the T1 of NVR1, upgrade route program request allocation table, the list item of this order request is added in route program request allocation table, see the last item list item of table 4.
Table 4
Service request message is sent to CDN server by RT1, forwards this service request message by CDN server to NVR1.Because above-mentioned identification information is encapsulated in the message body of service request message inside by PC1, so even if the outer envelope of CDN server change service request message, NVR1 still can obtain above-mentioned identification information from business request message inside.
After NVR1 receives this service request message, the service request type getting this service request message from the message content of this service request message is order request, monitor client is designated PC1, gap marker is the T1 of NVR1, upgrade the local front end program request allocation table preserved, see the last item list item of table 5.
Table 5
In the present embodiment, NVR1 makes regular check on the gap marker in table 5, encapsulates the video data of each passage.When carrying out video data encapsulation, UDP can be adopted to carry, and need the video data of different passage to be encapsulated in different UDP messages, to ensure that each packet only can comprise the video data of single channel.After completing UDP encapsulation, carry out the encapsulation of IP layer, and add gap marker in the Option field in IP packet header.
First NVR1 encapsulates the video data of T2 passage, adds the T2 of gap marker NVR1 in the Option field of the video data stream of encapsulation; The video data of T1 passage is encapsulated, adds the T1 of gap marker NVR1 in the Option field of the video data stream of encapsulation.As shown in Figure 2, NVR1 also has a T3 passage, but this passage does not occur in table 5, and that is T3 passage is not by any PC program request, so NVR1 is without the need to encapsulating the video data of T3 passage.
From foregoing description, NVR1 carries out video data encapsulation according to front end program request allocation table.Along with increase or the minimizing of demand (telecommunication) service, the list item in front end program request allocation table can change, and NVR1 by the mode of periodic detection front end program request allocation table, can increase or reduce the video data stream of respective channel.Suppose the program request list item turn increasing T3 passage in table 5, so, after NVR1 detects this list item, the video data of T3 passage is also encapsulated.
After completing the encapsulation to channel video data, NVR1 by the single session of setting up with CDN server by all video data stream to CDN server, forwarded to PC by CDN server.
First the video data stream that CDN server forwards arrives outlet routing device.Suppose that first RT1 receives the video data stream of the T2 passage of NVR1, RT1 intercepts the Option field in the IP packet header of this video data stream, and the gap marker getting this video data stream from this Option field is the T2 of NVR1.Query routing program request allocation table (table 4), in this route program request allocation table, the program request record of not this passage, therefore, ignores this video data stream, does not forward to Intranet.
When RT1 receives the video data stream of the T1 passage of NVR1, RT1 intercepts the Option field of this video data stream, and the gap marker getting this video data stream from this Option field is the T1 of NVR1.Query routing program request allocation table (table 4), can find the program request record of this passage in this route program request allocation table, then this video data stream is transmitted to PC1 according to the monitor client mark in table 4 by the session between RT1 and PC1 by RT1.Suppose the PC1 also program request fact of IPC4, when so RT1 receives the video data stream of T1 passage of NVR2, also by same session, video data stream is distinguished the video data of different passage according to the gap marker in video data stream to PC1, PC1.
Said process is the processing procedure of PC1 program request IPC1 fact.When PC1 stops program request IPC1, still can realize by sending service request message, difference is that service request type in service request message is for breaking request.
After RT1 receives service request message, the service request type of this service request message is got for breaking request from Option field, monitor client is designated PC1, gap marker is the T1 of NVR1, therefore, the last item list item of delete list 4, can not forward the video data of this passage again to PC1.
After NVR1 receives service request message, the service request type of this service request message is got for breaking request from the message content of this service request message, monitor client is designated PC1, and gap marker is the T1 of NVR1, then the last item list item in delete list 5.Owing to also there is other monitor client mark under T1 passage, so NVR1 still can encapsulate the video data of T1 passage and send.But because the list item of this passage is deleted by RT1, so the video data stream of this passage can not arrive PC1.
When not receiving the order request of PC1 transmission due to the reason NVR1 such as Network Abnormal or RT1 or break request in ageing time, then delete the list item of T1 passage respectively according to ageing time, stop the transmission of the video data stream of this passage.
Corresponding with the embodiment of the transmission of streams of video data method based on CDN of aforementioned monitoring frontend side, the application also provides the embodiment of the transmission of streams of video data device based on CDN.
The application can be applied on monitoring frontend based on the embodiment of the transmission of streams of video data device of CDN.Device embodiment can pass through software simulating, also can be realized by the mode of hardware or software and hardware combining.For software simulating, as the device on a logical meaning, be by the CPU of its place equipment, computer program instructions corresponding in nonvolatile memory is read operation in internal memory to be formed.Say from hardware view; as shown in Figure 5; for the application is based on a kind of hardware structure diagram of the transmission of streams of video data device place equipment of CDN, except the CPU shown in Fig. 5, internal memory and nonvolatile memory, in embodiment, the equipment at device place can also comprise other hardware usually.
Please refer to Fig. 6-1, is the structural representation of the transmission of streams of video data device based on CDN in the application's embodiment.Receiving element 601, encapsulation unit 602 and transmitting element 603 should be comprised based on the transmission of streams of video data device of CDN, wherein:
Receiving element 601, the service request message that the monitor client equipment forwarded for receiving CDN server sends, carries the gap marker of described monitoring frontend corresponding to described service request in described service request message;
Encapsulation unit 602, for according to described gap marker encapsulate video data flow, carries described gap marker in described video data stream;
Transmitting element 603, for setting up single session with described CDN server, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards, send described video data stream according to described gap marker to described monitor client equipment to make described outlet routing device.
Further, described encapsulation unit 602 carries described gap marker in described video data stream, is specially: carry described gap marker in the option Option field in the Internet protocol IP packet header of described video data stream.
Please refer to Fig. 6-2, is the structural representation of the transmission of streams of video data device based on CDN in another embodiment of the application.Based on the transmission of streams of video data device of CDN on the basis of Fig. 6-1, should also comprise acquiring unit 604, judging unit 605 and processing unit 606, wherein:
Acquiring unit 604, for obtaining service request type, monitor client mark and ageing time from described service request message;
Judging unit 605, for judging described service request type;
Processing unit 606, for when described service request type is order request, adds in front end program request allocation table by the corresponding relation list item of described monitor client mark, described gap marker and described ageing time; When described service request type is for breaking request, inquire about described front end program request allocation table; Delete the corresponding relation list item of the mark of monitor client described in described front end program request allocation table and described gap marker, when corresponding list item without described gap marker in described front end program request allocation table, described monitoring frontend stops encapsulation and sends video data stream corresponding to described gap marker to described CDN server; Or, make regular check on described front end program request allocation table, delete reach ageing time described front end program request allocation table described in the corresponding relation list item of monitor client mark and described gap marker, when in described front end program request allocation table during list item corresponding to described gap marker, described monitoring frontend stops encapsulation and sends video data stream corresponding to described gap marker to described CDN server.
The embodiment of the transmission of streams of video data device based on CDN that above-mentioned Fig. 6-1 and Fig. 6-2 illustrates, should based on the transmission of streams of video data application of installation of CDN on monitoring frontend, its specific implementation process see the explanation of the embodiment of the method for aforementioned monitoring frontend side, can not repeat them here.
Corresponding in the embodiment of the transmission of streams of video data method based on CDN of supervisory control system with aforementioned applications, the application also provides the embodiment of the transmission of streams of video data system based on CDN.
Please refer to Fig. 7, is the structural representation of the transmission of streams of video data system based on CDN in the application's embodiment.Monitoring frontend 71 and outlet routing device 72 should be comprised based on the transmission of streams of video data system of CDN, wherein:
Monitoring frontend 71, the first service request message that the first monitor client equipment forwarded for receiving CDN server sends, carries the first passage mark of described monitoring frontend 71 corresponding to described first service request in described first service request message; According to described first passage mark encapsulate video data flow, in described video data stream, carry described first passage mark; Set up single session with described CDN server, described encapsulate video data flow to described CDN server, and forward described video data stream by described CDN server to the outlet routing device 72 of described monitor client equipment side;
Outlet routing device 72, for receiving described video data stream; Described first passage mark is obtained from described video data stream; Whether there is the corresponding relation list item of described first passage mark in query routing program request allocation table, described route program request allocation table stores the corresponding relation that described first passage identified and asked the first monitor client equipment of described first passage video data stream; When there is the corresponding relation list item of described first passage mark, send described video data stream to described first monitor client equipment.
Further,
Described outlet routing device 72, also for receiving the first service request message that described first monitor client equipment sends, in described first service request message, carry service request type, the first monitor client mark, described first passage mark and described ageing time; Judge described service request type; When described service request type is the first order request, the corresponding relation list item of described first monitor client mark, described first passage mark and described ageing time is added in route program request allocation table; When described service request type is for breaking request, inquire about described route program request allocation table; Delete the corresponding relation list item that described in described route program request allocation table, the first monitor client mark identifies with described first passage; Or make regular check on described route program request allocation table, deletion reaches the corresponding relation list item that described in the described route program request allocation table of ageing time, the first monitor client identifies and described first passage identifies.
Further,
Described outlet routing device 72, also for receiving the second service request message that the second monitor client equipment sends to described monitoring frontend 71 after receiving described first service request message, inquire about described route program request allocation table, in described second service request message, carry the second channel mark of described monitoring frontend 71 corresponding to described second service request; The first passage mark of described monitoring frontend 71 is obtained from described route program request allocation table; Described first passage mark is added in described second service request message; Described second service request message is sent to described CDN server, described second service request message is forwarded to described monitoring frontend 71 by described CDN server, to identify according to described first passage mark and described second channel to make described monitoring frontend 71 and send to described CDN server after encapsulate video data flow respectively, described CDN server by second session of setting up with described outlet routing device 72 by described video data stream to described outlet routing device 72; Receive described video data stream, in described video data stream, carry described first passage mark and described second channel mark; Inquire about described route program request allocation table; According to the corresponding relation list item of the mark of first passage described in described route program request allocation table, give described first monitor client equipment by the video data stream of described first passage; According to the corresponding relation list item of the mark of second channel described in described route program request allocation table, give described second monitor client equipment by the video data stream of described second channel; When again receiving described first service request message, no longer send described first service request message to described CDN server, the described CDN server that described first service request message is corresponding and the first session that described outlet routing device 72 is set up are cancelled.
The embodiment of the transmission of streams of video data system based on CDN shown in above-mentioned Fig. 7, its specific implementation process see the explanation of the transmission of streams of video data embodiment of the method based on CDN of aforementioned applications in supervisory control system, can not repeat them here.
As can be seen from the embodiment of above method, device and system, the application carries out transmission of streams of video data by single session between monitoring frontend and CDN server, by carrying the gap marker of monitoring frontend in video data stream, distinguish the video data stream of different passage, thus save the expense utilizing CDN to carry out video data transmission, meanwhile, network resource consumption is reduced.
The foregoing is only the preferred embodiment of the application, not in order to limit the application, within all spirit in the application and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.
Claims (12)
1. a transmission of streams of video data method of content-based distributing network CDN, be applied on monitoring frontend, it is characterized in that, the method comprises:
Receive the service request message of the monitor client equipment transmission that CDN server forwards, in described service request message, carry the gap marker of described monitoring frontend corresponding to described service request;
According to described gap marker encapsulate video data flow, in described video data stream, carry described gap marker;
Single session is set up with described CDN server, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards, send described video data stream according to described gap marker to described monitor client equipment to make described outlet routing device.
2. the method for claim 1, is characterized in that, describedly in described video data stream, carries described gap marker, is specially:
Described gap marker is carried in the option Option field in the Internet protocol IP packet header of described video data stream.
3. the method for claim 1, is characterized in that, also carry service request type, monitor client mark and ageing time in described service request message, described method also comprises:
Described service request type, described monitor client mark and described ageing time is obtained from described service request message;
Judge described service request type;
When described service request type is order request, the corresponding relation list item of described monitor client mark, described gap marker and described ageing time is added in front end program request allocation table;
When described service request type is for breaking request, inquire about described front end program request allocation table;
Delete the corresponding relation list item of the mark of monitor client described in described front end program request allocation table and described gap marker, when corresponding list item without described gap marker in described front end program request allocation table, described monitoring frontend stops encapsulation and sends video data stream corresponding to described gap marker to described CDN server;
Or,
Make regular check on described front end program request allocation table, delete reach ageing time described front end program request allocation table described in the corresponding relation list item of monitor client mark and described gap marker, when in described front end program request allocation table during list item corresponding to described gap marker, described monitoring frontend stops encapsulation and sends video data stream corresponding to described gap marker to described CDN server.
4., based on a transmission of streams of video data method of CDN, be applied in the supervisory control system based on CDN, it is characterized in that, the method comprises:
Monitoring frontend receives the first service request message of the first monitor client equipment transmission that CDN server forwards, and carries the first passage mark of described monitoring frontend corresponding to described first service request in described first service request message;
Described monitoring frontend, according to described first passage mark encapsulate video data flow, carries described first passage mark in described video data stream;
Described monitoring frontend and described CDN server set up single session, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards;
Described outlet routing device receives described video data stream;
Described outlet routing device obtains described first passage mark from described video data stream;
Described Exit Road is by the corresponding relation list item that whether there is described first passage mark in equipment query route program request allocation table, and described route program request allocation table stores the corresponding relation that described first passage identified and asked the first monitor client equipment of described first passage video data stream;
When there is the corresponding relation list item of described first passage mark, described outlet routing device sends described video data stream to described first monitor client equipment.
5. method as claimed in claim 4, it is characterized in that, described method also comprises:
Described outlet routing device receives the first service request message that described first monitor client equipment sends, and carries service request type, the first monitor client mark, described first passage mark and described ageing time in described first service request message;
Described outlet routing device judges described service request type;
When described service request type is the first order request, the corresponding relation list item of described first monitor client mark, described first passage mark and described ageing time adds in route program request allocation table by described outlet routing device;
When described service request type is for breaking request, described Exit Road is by route program request allocation table described in equipment query;
Described Exit Road identifies by the first monitor client described in route program request allocation table described in unit deletion the corresponding relation list item identified with described first passage;
Or,
Described Exit Road is by route program request allocation table described in regular inspections of equipment, and deletion reaches the corresponding relation list item that described in the described route program request allocation table of ageing time, the first monitor client identifies and described first passage identifies.
6. method as claimed in claim 5, it is characterized in that, described method also comprises:
The second service request message that the second monitor client equipment sends to described monitoring frontend is received after described outlet routing device receives described first service request message, inquire about described route program request allocation table, in described second service request message, carry the second channel mark of described monitoring frontend corresponding to described second service request;
Described outlet routing device obtains the first passage mark of described monitoring frontend from described route program request allocation table;
Described first passage mark is added in described second service request message by described outlet routing device;
Described outlet routing device sends described second service request message to described CDN server, described second service request message is forwarded to described monitoring frontend by described CDN server, to identify according to described first passage mark and described second channel to make described monitoring frontend and send to described CDN server after encapsulate video data flow respectively, described CDN server by second session of setting up with described outlet routing device by described video data stream to described outlet routing device;
Described outlet routing device receives described video data stream, carries described first passage mark and described second channel mark in described video data stream;
Described Exit Road is by route program request allocation table described in equipment query;
The corresponding relation list item that described outlet routing device identifies according to first passage described in described route program request allocation table, gives described first monitor client equipment by the video data stream of described first passage;
The corresponding relation list item that described outlet routing device identifies according to second channel described in described route program request allocation table, gives described second monitor client equipment by the video data stream of described second channel;
When described outlet routing device receives described first service request message again, no longer send described first service request message to described CDN server, the described CDN server that described first service request message is corresponding and the first session that described outlet routing device is set up are cancelled.
7. a transmission of streams of video data device of content-based distributing network CDN, is applied on monitoring frontend, it is characterized in that, this device comprises:
Receiving element, the service request message that the monitor client equipment forwarded for receiving CDN server sends, carries the gap marker of described monitoring frontend corresponding to described service request in described service request message;
Encapsulation unit, for according to described gap marker encapsulate video data flow, carries described gap marker in described video data stream;
Transmitting element, for setting up single session with described CDN server, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards, send described video data stream according to described gap marker to described monitor client equipment to make described outlet routing device.
8. device as claimed in claim 7, is characterized in that:
Described encapsulation unit carries described gap marker in described video data stream, is specially:
Described gap marker is carried in the option Option field in the Internet protocol IP packet header of described video data stream.
9. device as claimed in claim 7, it is characterized in that, described device also comprises:
Acquiring unit, for obtaining service request type, monitor client mark and ageing time from described service request message;
Judging unit, for judging described service request type;
Processing unit, for when described service request type is order request, adds in front end program request allocation table by the corresponding relation list item of described monitor client mark, described gap marker and described ageing time; When described service request type is for breaking request, inquire about described front end program request allocation table; Delete the corresponding relation list item of the mark of monitor client described in described front end program request allocation table and described gap marker, when corresponding list item without described gap marker in described front end program request allocation table, described monitoring frontend stops encapsulation and sends video data stream corresponding to described gap marker to described CDN server; Or, make regular check on described front end program request allocation table, delete reach ageing time described front end program request allocation table described in the corresponding relation list item of monitor client mark and described gap marker, when in described front end program request allocation table during list item corresponding to described gap marker, described monitoring frontend stops encapsulation and sends video data stream corresponding to described gap marker to described CDN server.
10. based on a transmission of streams of video data system of CDN, it is characterized in that, this system comprises:
Monitoring frontend, the first service request message that the first monitor client equipment forwarded for receiving CDN server sends, carries the first passage mark of described monitoring frontend corresponding to described first service request in described first service request message; According to described first passage mark encapsulate video data flow, in described video data stream, carry described first passage mark; Set up single session with described CDN server, described encapsulate video data flow to described CDN server, and by described CDN server to the Exit Road of described monitor client equipment side by video data stream described in device forwards;
Outlet routing device, for receiving described video data stream; Described first passage mark is obtained from described video data stream; Whether there is the corresponding relation list item of described first passage mark in query routing program request allocation table, described route program request allocation table stores the corresponding relation that described first passage identified and asked the first monitor client equipment of described first passage video data stream; When there is the corresponding relation list item of described first passage mark, send described video data stream to described first monitor client equipment.
11. systems as claimed in claim 10, it is characterized in that, described system also comprises:
Described outlet routing device, also for receiving the first service request message that described first monitor client equipment sends, in described first service request message, carry service request type, the first monitor client mark, described first passage mark and described ageing time; Judge described service request type; When described service request type is the first order request, the corresponding relation list item of described first monitor client mark, described first passage mark and described ageing time is added in route program request allocation table; When described service request type is for breaking request, inquire about described route program request allocation table; Delete the corresponding relation list item that described in described route program request allocation table, the first monitor client mark identifies with described first passage; Or make regular check on described route program request allocation table, deletion reaches the corresponding relation list item that described in the described route program request allocation table of ageing time, the first monitor client identifies and described first passage identifies.
12. systems as claimed in claim 10, it is characterized in that, described system also comprises:
Described outlet routing device, also for receiving the second service request message that the second monitor client equipment sends to described monitoring frontend after receiving described first service request message, inquire about described route program request allocation table, in described second service request message, carry the second channel mark of described monitoring frontend corresponding to described second service request; The first passage mark of described monitoring frontend is obtained from described route program request allocation table; Described first passage mark is added in described second service request message; Described second service request message is sent to described CDN server, described second service request message is forwarded to described monitoring frontend by described CDN server, to identify according to described first passage mark and described second channel to make described monitoring frontend and send to described CDN server after encapsulate video data flow respectively, described CDN server by second session of setting up with described outlet routing device by described video data stream to described outlet routing device; Receive described video data stream, in described video data stream, carry described first passage mark and described second channel mark; Inquire about described route program request allocation table; According to the corresponding relation list item of the mark of first passage described in described route program request allocation table, give described first monitor client equipment by the video data stream of described first passage; According to the corresponding relation list item of the mark of second channel described in described route program request allocation table, give described second monitor client equipment by the video data stream of described second channel; When again receiving described first service request message, no longer send described first service request message to described CDN server, the described CDN server that described first service request message is corresponding and the first session that described outlet routing device is set up are cancelled.
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