CN102821311B - Video data packet priority setting method and device - Google Patents
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Abstract
The invention provides a video data packet priority setting method, which comprises following steps that a coding device receives a video-on-demand signaling carrying definition priority or fluency priority transmitted by a video management server, SVC (switching virtual circuit) coding is conducted for a video image on demand, a priority label is printed on the video data packet: when a video-on-demand device requires the definition priority, the coding device labels the video data packet which is encapsulated by a frame I in GOP (group of pictures) of each layer of an airspace as top priority; when the video-on-demand device requires the fluency priority, the coding device labels the video data packet which is encapsulated by each frame in GOP of o<th> layer of the airspace as top priority; and the video data packet is encapsulated as an IP (internet protocol) data packet, and the priority label is arranged on the head part of an IP layer of the IP data packet, so that a network device can dispatch and forward the video data packet according to the priority labels. The invention also provides a device with same concept. Due to the adoption of the method and the device, the load of the network device is alleviated, and the user experience can be enhanced.
Description
Technical field
The present invention relates to field of video monitoring, particularly relate to the method and apparatus that a kind of video data packet priority is arranged.
Background technology
IP video monitoring has become the main flow of safety-security area.The characteristic making full use of IP network can bring a lot of beyond thought benefit for monitoring business.Be carried in the video monitoring system of IP network at one, there is numerous video front encoding devices (such as encoder EC, web camera IPC) and Video back-end Anytime device, as decoder DC, client XP (common software player).When the live video stream of multiple Video back-end Anytime device program request front end, easily cause congested to IP network, this is because video stream data amount large this objective fact causes.The technology that current industry adopts usually is QOS configuration, namely video data the upper static configuration traffic classification of all-network equipment (as router, switch) of process, such as traffic classification is carried out to the different pieces of information bag comprising scalable video coding SVC, the QOS priority of corresponding packet is revised by the network equipment, enter corresponding priority query, carry out corresponding queue scheduling.
But this just requires that the network equipment carries out profound detection to Business Stream, and namely can identify which video data is important can not being dropped, which video data time important can abandon part, and which is completely unessential can all abandoning.If the network equipment all carries out so profound traffic classification stream matching treatment to all data flow, will greatly increase the burden of the network equipment, have high requirement to the performance of the network equipment and function.The Main Function of the network equipment is the forwarding carrying out message according to the address of message, and hardware or CPU usually can be adopted to realize forwarding work; If when adopting CPU to forward, the Performance comparision of CPU is high, but cpu performance can be consumed in a large number by message repeating work, remains little; And the traffic classification stream matching treatment of profound level is all rely on the upper executive software of CPU to realize at present, obviously this is be difficult to realization for the remaining cpu resource of the network equipment, or needs user to pay high cost.In addition, the configuration effort amount of this technology is also larger, and planning is complicated.
Summary of the invention
In view of this, the invention provides a kind of video data packet priority method to set up, the method is applied on the encoding device of video surveillance network, described video surveillance network also comprises: video management server, video request program equipment, the network equipment, the method comprises: the video request program signaling that encoding device receiver, video management server sends, and this program request signaling carries the quality requirement information of video request program equipment to video flowing, and this quality requirement information comprises that definition is preferential or fluency is preferential; Encoding device is according to the quality requirement information of video request program equipment to video flowing, the video image of program request is carried out to SVC coding and stamps priority tag to video packets of data: when Anytime device requires that definition is preferential, the video data packet making limit priority that the I frame in the GOP of every for spatial domain one deck is packaged into by encoding device; When Anytime device requires that fluency is preferential, the video packets of data that each frame in the GOP in the 0th layer, spatial domain is packaged into all is marked limit priority by encoding device; Described video packets of data is encapsulated as IP packet, and described priority tag is arranged at the IP layer head of IP packet with the scheduling forwarding making the described network equipment can carry out video packets of data according to described priority tag.
The present invention also provides a kind of video data packet priority setting device, this application of installation is on the encoding device of video surveillance network, described video surveillance network also comprises: video management server, video request program equipment, the network equipment, this device comprises: signaling receiver module, for the video request program signaling that receiver, video management server sends, this program request signaling carries the quality requirement information of video request program equipment to video flowing, and this quality requirement information comprises that definition is preferential or fluency is preferential; Coding and priority flag module, for according to the quality requirement information of video request program equipment to video flowing, the video image of program request is carried out to SVC coding and stamps priority tag to video packets of data: when Anytime device requires that definition is preferential, the video data packet making limit priority that the I frame in the GOP of every for spatial domain one deck is packaged into by encoding device; When Anytime device requires that fluency is preferential, the video packets of data that each frame in the GOP in the 0th layer, spatial domain is packaged into all is marked limit priority by encoding device; Described video packets of data is encapsulated as IP packet, and described priority tag is arranged at the IP layer head of IP packet with the scheduling forwarding making the described network equipment can carry out video packets of data according to described priority tag.
By technology of the present invention, significantly reduce the burden of the network equipment in IP network, and for the performance of encoding device without obvious impact.Meanwhile, user can obtain according to oneself the video image meeting oneself demand to the quality requirement of video image, greatly improve the experience of user.
Accompanying drawing explanation
Fig. 1 is a kind of monitor network schematic diagram.
Fig. 2 is one embodiment of the present invention method flow diagram.
Fig. 3 is Session Initiation Protocol message extended example.
Fig. 4 is SVC codimg logic structure chart.
Fig. 5 a ~ 5c is SVC encoding examples figure.
Fig. 6 is the functional block diagram of embodiment of the present invention device.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described.Fig. 1 is a kind of monitor network schematic diagram of the present invention, and this monitor network comprises encoding device (as encoder EC), monitoring server (as VM), the network equipment (as router Router, switch Switch), Anytime device (as DC, the XP player be arranged on PC).Encoding device, monitoring server, Anytime device carry out signaling message and service message interaction by IP network.Encoding device is a kind of equipment for audiovisual compression coding, comprises encoder EC, web camera IPC.VM(Video Management) be the manager of whole video monitoring system, it comprises one or more functions following: can manage the equipment controlled in supervisory control system concentratedly; Various video monitoring service can be dispatched; Can manage and distribute supervisory user authority.The live audio/video flow of Anytime device program request is checked for user, comprises decoder DC, client XP.The IP network of carrying monitoring signaling and audio/video flow comprises the network equipment such as router and/or switch.Monitor network also comprises the memory device (not shown) for storing audio/video flow, stores monitor data on it for user's playback.
Based on above-mentioned monitor network, the embodiment of the present invention describes and does not a kind ofly rely on the method that traditional network equipment carries out Qos process, and the flow chart of the method is see Fig. 2.
Step 21, video request program equipment send live order request to video management server VM, carry the video flow quality demand that definition is preferential or fluency is preferential in this request.
Video request program equipment generally all needs when program request live video stream, by signaling message, its demand is sent to VM, notifies that video encoder sends corresponding video flowing by VM.In the present embodiment, in the order request of user, also add self requirement for video flow quality, if more wish to see video pictures clearly, just carry the quality requirement information of " definition is preferential "; If more wish to see video pictures that is smooth, that do not stop, just carry the quality requirement information of " fluency is preferential ".Furthermore, this demand of user can need the actual content checking picture to decide according to its program request moment.Such as will check the appearance of some suspects, what user needed should be picture more clearly, check the process that an event occurs, what user needed should be more smooth picture.If so the quality of its selectable video of user can be provided will to be a significantly thing.Actual in realization, relevant configuration can be provided to select interface to user, provide the option of the demand information of aforementioned two kinds of quality, if user does not select to select a kind of quality requirement information to select by default, during such user operation, allow it on interface, select entrance to adjust the demand information of self in real time by the configuration on interface at any time.
Video request program equipment sends to the video on-demand request of VM to be generally signaling message based on Session Initiation Protocol, the quality requirement information that above-mentioned definition is preferential or fluency is preferential can at the SDP(Session Description Protocol of Session Initiation Protocol message) Capacity extension collection in expand, specifically see Fig. 3.The preferential amplifying message of definition can define by following form:
Media Attribute(a):User
Media Attribute Fieldname:User preference
Media Format:1
Media format specific parameters:Definition
The preferential message of fluency can define by following form:
Media Attribute(a):User
Media Attribute Fieldname:User preference
Media Format:2
Media format specific parameters:Fluency
SDP(Session Description Protocol at Session Initiation Protocol message) Capacity extension collection expand definition prior message or fluency prior message and be easy to realize, do not consume the performance of encoding device.
What step 22, video management server receiver, video Anytime device sent carries the video on-demand request that definition is preferential or fluency is preferential.
VM is after receiving above-mentioned video request program device request, first check whether the encoding device of this live order request program request is supported H.264SVC to encode, if supported, in the program request of video request program equipment is the preferential message of definition, then send the message of following form to video request program equipment and encoding device:
Media Attribute(a):User
Media Attribute Fieldname:User preference
Media Format:1
Media format specific parameters:Definition
In the program request of video request program equipment is the preferential message of fluency, then send the message of following form to video request program equipment and encoding device:
Media Attribute(a):User
Media Attribute Fieldname:User preference
Media Format:2
Media format specific parameters:Fluency
If do not supported, then reply the message of the following form of video request program equipment:
Media Attribute(a):User
Media Attribute Fieldname:User preference
Media Format:0
Media format specific parameters:none
If do not supported, then peel off the quality requirement information that definition is preferential or fluency is preferential, the order request of not carrying user quality demand information is sent to encoding device.
If there is two or more video request program equipment to apply for the same video flowing of program request to VM simultaneously, and it is different to the requirement of this video flowing of program request, such as: the video flowing of Anytime device A program request encoder 1 passage 1, requirement fluency is preferential, the video flowing of Anytime device B also program request encoder 1 passage 1, requires that definition is preferential.VM can decide according to the Permission Levels height of Anytime device the demand responding which Anytime device.If the authority of Anytime device A is higher than Anytime device B, then VM sends the preferential video request program instruction of fluency to encoding device.If the Permission Levels of Anytime device are the same, then according to the principle first obtained first.If order request preferential for fluency is sent to VM by Anytime device A, the follow-up program request equipment B order request that definition is preferential for same video stream, VM judges that program request device A is the same with the Permission Levels of Anytime device B, the requirement that then Anytime device B definition is preferential will not responded, or the video flowing issuing Anytime device A is directly sent to Anytime device B.
The video request program signaling that step 23, encoding device receiver, video management server send, this program request signaling carries the quality requirement information of video request program equipment to video flowing, and this quality requirement information comprises that definition is preferential or fluency is preferential.
Encoding device of the present invention functionally comprises video data packet priority setting device, and this device comprises signaling receiver module and coding and priority flag module, ginseng Fig. 6.Step 23 is performed by signaling receiver module.
Step 24, encoding device are according to the quality requirement information of video request program equipment to video flowing, the video image of program request is carried out to SVC coding and stamps priority tag to video packets of data: when Anytime device requires that definition is preferential, encoding device is by the I frame flag limit priority in every for spatial domain one deck GOP; When Anytime device requires that fluency is preferential, each frame in the GOP of the 0th layer, spatial domain is all marked limit priority by encoding device; Described video packets of data is encapsulated as IP packet, and described priority tag is arranged at the IP layer head of IP packet with the scheduling forwarding making the described network equipment can carry out video packets of data according to described priority tag.This step is by encoding and the execution of priority flag module.
SVC(scalable video coding) be a kind of scalable video coding mode, comprise spatial domain hierarchical coding, time domain hierarchical coding and mass segregation coding.The spatial domain video sequence that flows through original video forms spatial domain the 0th layer video sequence after extracting, and spatial domain the 1st layer video sequence, spatial domain the 2nd layer video sequence are to spatial domain n-th layer video sequence.Each layer video sequence of spatial domain is encoded respectively as the video input sequence of time domain hierarchical coding, and after coding, spatial domain the 0th layer video sequence forms the GOP with I frame, P frame and/or B frame.The 1st layer ~ spatial domain, spatial domain n-th layer video sequence is the same with spatial domain the 0th layer video sequence, is also encoded into the GOP of I frame, P frame and/or B frame.Fig. 4 gives a SVC codimg logic structure chart.When Anytime device requires that definition is preferential, encoding device is to the I frame flag limit priority in the GOP of the every one deck in spatial domain; When Anytime device requires fluency priority, all limit priority is marked to each frame in the GOP group of the 0th layer, spatial domain.After encoding device determines limit priority by above-mentioned rule, time the video packets of encapsulation limit priority is transmitted in an ip network, will be scheduled forwarding at first, and these packets finally arrive Anytime device, after Anytime device decoding, the image of image or smoothness clearly can be seen.The video packets of data of encapsulation is packaged into IP packet when transmitting on ip networks, and the network equipment in IP bearer network forwards according to three layers or two-layer protocol after receiving the IP packet of carrying video flowing.Encoding device beats at IP header to the label of different video data packet making different priorities, can be positioned at Tos(type of service) field, such as adopt IP precedence or DSCP priority.Encoding device has fully taken into account the convenience that the network equipment forwards when arranging priority tag, after network equipment decapsulation IP layer head, directly according to label video packets of data lost according to corresponding priority tag and carry out scheduling into different priority queries and forward.Such network equipment carries out profound detection to judge which is that needs preferentially forward with regard to not needing to each video packets of data, significantly reduces the burden of the network equipment.The encoding device only doing compressed encoding in prior art has carried out IP layer QOS process to video packets of data in the present embodiment.Because encoding device inherently needs the data encapsulation after by compressed encoding to become IP packet, so the extra priority tag increased can't increase its too many burden.
Only done the differentiation of limit priority to video packets of data above, so only met the demand that user is basic, if want to allow user have better experience, encoding device can also carry out the mark of priority further to other frame of video.Such as, when Anytime device requires that definition is preferential, encoding device selects one or more intermediate frame to the GOP of the every one deck in spatial domain according to even partition algorithm further successively from these GOP, different priority on the video data packet making form the intermediate frame selected (priority of the intermediate frame wherein first selected higher than after the priority of intermediate frame selected).When Anytime device requires that fluency is preferential time, the packet that encoding device is formed the frame of video of spatial domain other level except the 0th layer further carries out the mark of different priorities.Network occur congested in, the more careful like this different video packet priority that carried out is distinguished more to enter level and ensure that the packet of higher priority is preferentially forwarded.
Particularly, when Anytime device requires that definition is preferential, encoding device performs the determination that following steps carry out priority further:
S1, with I frame, intermediate frame and tail frame, the region between two adjacent frames is as region to be divided, and the current region to be divided determined is 2
nindividual; N=0 time wherein initially, and there is no intermediate frame;
S2, according to pre-defined rule from 2
ndetermine the intermediate frame made new advances in individual region to be divided respectively, and the priority flag of the video packets of data be packaged into by the new intermediate frame determined is m high priority, wherein m=n+2; Judge whether n arrives predetermined maximum, is, terminates; Otherwise n=n+1 also returns step S1.
When Anytime device requires that fluency is preferential, encoding device performs the mark that following steps carry out priority further: all mark m high priority to the video packets of data that each frame in the n-th layer GOP group of spatial domain is packaged into, wherein m=n+1.
The above-mentioned action other frame being carried out to further priority flag is by encode and priority flag module performs.
For the GOP that Fig. 5 a ~ Fig. 5 c, Fig. 5 a are after spatial domain the 0th layer video sequence is encoded, this GOP group comprises 8 frames, and the 0th frame is I frame, and all the other are P frame.Fig. 5 b is a GOP after spatial domain the 1st layer video sequence is encoded, and this GOP comprises 8 frames, and the 0th frame is I frame, and all the other are P frame.Fig. 5 c is a GOP after spatial domain the 2nd layer video sequence is encoded, and this GOP comprises 8 frames, and the 0th frame is I frame, and all the other are P frame.This routine SVC is coded in spatial domain and divide into 3 layers, divide into 8 layers in time domain.In time requiring definition preferential, need the 0th frame to the 0th layer, spatial domain, the 1st layer, spatial domain, the 2nd layer, spatial domain, the video packets of data that namely the I frame of every one deck is packaged into all stamps the label of limit priority; In time requiring fluency preferential, need the 0th layer, spatial domain, the video packets of data that namely all frames of Primary layer are packaged into all stamps the label of limit priority.
On the basis meeting Anytime device requirement, in order to allow user have better experience, this example performs above-mentioned steps S 1 and step S2 further.Specific as follows: n=0 time initial, does not have intermediate frame, the maximum presetting n is that the frame number that the maximum of 1, n can comprise according to a GOP is determined, in this example, a GOP only contains 8 frames, so the maximum of n is relatively little;
1, n=0, to the every one deck in spatial domain, using the region between I frame and tail frame as region to be divided (region to be divided is 1) in a GOP, from this region to be divided, the intermediate frame made new advances is determined according to predetermined rule, predetermined rule can be in region to be divided, that frame mediated, as intermediate frame, if centre position is not unique, can select any one frame of relative intermediate position as intermediate frame.With reference to figure 5a ~ Fig. 5 c, using the region between the 0th frame ~ the 7th frame as region to be divided, determine in this region, which frame is intermediate frame.This region can comprise first frame, also can not comprise first frame.Not comprise first frame, the frame in this region is: the 1st frame, the 2nd frame, the 3rd frame, the 4th frame, the 5th frame, the 6th frame, the 7th frame; In this region to be divided, obviously, that frame in centre position is the 4th frame, so the 4th frame is the intermediate frame selected, the priority of the 4th frame is the 2nd high priority.N does not arrive maximum, n=n+1=0+1=1;
2, during n=1, for the every one deck in spatial domain, using the region of I frame, current intermediate frame, adjacent two frames composition of tail frame as region to be divided, namely with first frame, the region between adjacent two frames of the 4th frame, the 7th frame is region to be divided.Do not comprise first frame and intermediate frame for region, the first region to be divided comprises the 1st frame, the 2nd frame, the 3rd frame; Second region to be divided comprises the 5th frame, the 6th frame, the 7th frame.In these two regions, the intermediate frame determined respectively is the 2nd frame and the 6th frame, and the priority of the 2nd frame and the 6th frame is the 3rd high priority.N arrives maximum, terminates.
In this example after execution of step S1 and S2, for not determining that the frame of priority is directly defined as the 4th high priority.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. a video data packet priority method to set up, is characterized in that, the method is applied on the encoding device of video surveillance network, and described video surveillance network also comprises: video management server, video request program equipment, the network equipment, and the method comprises:
The video request program signaling that encoding device receiver, video management server sends, this program request signaling carries the quality requirement information of video request program equipment to video flowing, and this quality requirement information comprises that definition is preferential or fluency is preferential;
Encoding device is according to the quality requirement information of video request program equipment to video flowing, the video image of program request is carried out to SVC coding and stamps priority tag to video packets of data: when Anytime device requires that definition is preferential, the video data packet making limit priority that I frame in the GOP of every for spatial domain one deck is packaged into by encoding device, successively one or more intermediate frame is selected from GOP according to even partition algorithm to the GOP of the every one deck in spatial domain, priority on the video data packet making that the intermediate frame selected is packaged into, the video data packet priority that the intermediate frame wherein first selected is packaged into higher than after select the priority of the video packets of data that intermediate frame is packaged into, when Anytime device requires that fluency is preferential, the video packets of data that each frame in the GOP in the 0th layer, spatial domain is packaged into all is marked limit priority by encoding device, described video packets of data is encapsulated as IP packet, and described priority tag is arranged at the IP layer head of IP packet with the scheduling forwarding making the described network equipment can carry out video packets of data according to described priority tag.
2. the method for claim 1, is characterized in that, described even partition algorithm comprises the steps:
S1, with I frame, intermediate frame and tail frame, the region between two adjacent frames is as region to be divided, and the current region to be divided determined is 2n; N=0 time wherein initially, and there is no intermediate frame;
S2, determine the intermediate frame made new advances respectively, and the priority flag of the video packets of data be packaged into by the new intermediate frame determined is m high priority, wherein m=n+2 according to pre-defined rule from 2n region to be divided; Judge whether n arrives predetermined maximum, is, terminates; Otherwise n=n+1 also returns step S1.
3. the method for claim 1, it is characterized in that, when Anytime device requires that fluency is preferential, encoding device performs the mark that following steps carry out priority further: all mark m high priority to the video packets of data that each frame in the n-th layer GOP group of spatial domain is packaged into, wherein m=n+1.
4. the method for claim 1, is characterized in that, described priority tag is arranged at the Tos field of IP header, adopts IP precedence or DSCP priority.
5. a video data packet priority setting device, is characterized in that, this application of installation is on the encoding device of video surveillance network, and described video surveillance network also comprises: video management server, video request program equipment, the network equipment, and this device comprises:
Signaling receiver module, for the video request program signaling that receiver, video management server sends, this program request signaling carries the quality requirement information of video request program equipment to video flowing, and this quality requirement information comprises that definition is preferential or fluency is preferential;
Coding and priority flag module, for according to the quality requirement information of video request program equipment to video flowing, the video image of program request is carried out to SVC coding and stamps priority tag to video packets of data: when Anytime device requires that definition is preferential, the video data packet making limit priority that I frame in the GOP of every for spatial domain one deck is packaged into by encoding device, successively one or more intermediate frame is selected from GOP according to even partition algorithm to the GOP of the every one deck in spatial domain, priority on the video data packet making that the intermediate frame selected is packaged into, the video data packet priority that the intermediate frame wherein first selected is packaged into higher than after select the priority of the video packets of data that intermediate frame is packaged into, when Anytime device requires that fluency is preferential, the video packets of data that each frame in the GOP in the 0th layer, spatial domain is packaged into all is marked limit priority by encoding device, described video packets of data is encapsulated as IP packet, and described priority tag is arranged at the IP layer head of IP packet with the scheduling forwarding making the described network equipment can carry out video packets of data according to described priority tag.
6. device as claimed in claim 5, it is characterized in that, described even partition algorithm comprises the steps:
S1, with I frame, intermediate frame and tail frame, the region between two adjacent frames is as region to be divided, and the current region to be divided determined is 2n; N=0 time wherein initially, and there is no intermediate frame;
S2, determine the intermediate frame made new advances respectively, and the priority flag of the video packets of data be packaged into by the new intermediate frame determined is m high priority, wherein m=n+2 according to pre-defined rule from 2n region to be divided; Judge whether n arrives predetermined maximum, is, terminates; Otherwise n=n+1 also returns step S1.
7. device as claimed in claim 5, it is characterized in that, described coding and priority flag module are further used for when Anytime device requirement fluency is preferential, perform the mark that following steps carry out priority: all m high priority is marked to the video packets of data that each frame in the n-th layer GOP group of spatial domain is packaged into, wherein m=n+1.
8. device as claimed in claim 5, it is characterized in that, described priority tag is arranged at the Tos field of IP header, adopts IP precedence or DSCP priority.
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