CN104125429A - Video data transmission adjusting method and device - Google Patents
Video data transmission adjusting method and device Download PDFInfo
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Abstract
The invention discloses a video data transmission adjusting method and device. In the above method, to determine whether to enter the cycle, the cycle for the time preset insert the key frames; according to determine whether the insert key frame, in the current period of network running status information access to them, insert the key frames for the bit rate control of video the data in the current period. According to the technical scheme provided by the invention, and by periodically inserting a key frame timely and effectively control the dynamic video data is occupied by the transmission bandwidth and wireless network bandwidth adaptation.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of control method and device of video data transmitting.
Background technology
At present, in mobile video monitor field, owing to cannot passing through wired mode transmitting real-time data, thereby can only carry out data transmission by mobile network's wireless mode.But due to wireless network, it is mobile data network, for example: GPRS (General Packet Radio Service, referred to as GPRS), Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, referred to as WCDMA) unstable, particularly under vehicle-mounted mobile environment, because the changeable environments such as base station range, fixed area number of users cause wireless network bandwidth fluctuation very large, for real-time and fluency, requiring quite high long-distance video preview is thus acid test very.For corresponding with changeable network environment, video data must be made correspondingly and controlling in the process of transmission, thereby makes the shared bandwidth of video data and wireless network bandwidth accomplish as much as possible dynamically to adapt.
Fig. 1 is according to the structured flowchart of the video wireless remote prebrowsing system of correlation technique.As shown in Figure 1, video wireless remote prebrowsing system can consist of three parts, specifically can comprise: vehicle-mounted monitoring equipment, streaming media server and client.Vehicle-mounted monitoring equipment, for sending in real time video data by wireless network; Streaming media server, is used to a plurality of clients to forward code stream; Client can be personal computer (PC) client or cell-phone customer terminal, for video data being decoded and playing.As can be seen here, the network bandwidth bottleneck of whole system is mainly present in vehicle-mounted monitoring equipment to the uplink stage of streaming media server.
In correlation technique, in order to solve the common control method adopting of problem of network bandwidth bottleneck, there are following two kinds: the first, in the situation that network environment runs down, is only sent out key frame (I frame) data.I frame is not rely on other image, the intracoded frame that can independently decode, and conduct is with reference to frame under normal conditions.I frame is generally for example, with predetermined interval (: 1 second or 4 seconds) appearance in code stream, and its decoding must be from I frame data.Yet the defect of this kind of control method is because decoding must, from I frame data, therefore can cause the dynamic continuity of preview image poor.It two is directly to reduce coding parameter; such as: frame per second, code check etc.; if being to revise above-mentioned parameter value, its defect conventionally can produce new I frame; thereby cause the moment generation of code check amount abnormal; do not fall anti-increasing, cannot control preferably shared bandwidth and the wireless network bandwidth of video data transmitting and dynamically adapt.
Summary of the invention
The invention provides a kind of control method and device of video data transmitting, at least to solve, in correlation technique, cannot control preferably the problem that the shared bandwidth of the video data that transmitting and wireless network bandwidth dynamically adapt.
A kind of control method of video data transmitting is provided according to an aspect of the present invention.
According to the control method of video data transmitting of the present invention, comprise: determine whether to enter the cycle, this cycle is the time period of default insertion key frame; According to the network operation state information getting, determine whether to enter key frame in current period interpolation, wherein, in current period interpolation, enter key frame for regulating the code check of video data.
Preferably, according to the network operation state information getting, determine whether that in current period interpolation, entering key frame comprises: obtain the network performance index in current period, wherein, network performance index at least comprises one of following: bandwidth availability ratio, network packet loss rate, transmission delay; According to network performance index, whether being greater than the first predetermined threshold value determines whether to enter key frame in current period interpolation.
Preferably, obtaining network performance index comprises: in current period, detect respectively the shared bandwidth of current network bandwidth and transmitting video data; Calculate the difference of the shared bandwidth of current network bandwidth and transmitting video data or calculate the shared bandwidth of transmitting video data and the ratio of current network bandwidth, obtaining bandwidth availability ratio.
Preferably, obtaining network performance index comprises: in current period, detect respectively the total amount of packet and the quantity of the packet that receiving terminal receives that transmitting terminal sends; Quantity computing network packet loss according to the total amount of the packet sending with the packet receiving.
Preferably, obtaining network performance index comprises: in current period, detect transmitting terminal and send the very first time of every frame video packets of data and detect transmitting terminal and receive receiving terminal in the second time that receives the confirmation bag feeding back after every frame video packets of data; According to the very first time and the second Time Calculation transmission delay.
Preferably, determine whether also to comprise after current period interpolation enters key frame whether being greater than the first predetermined threshold value according to network performance index: if network performance index is greater than or equal to the first predetermined threshold value, in current period interpolation, enter key frame; In the cycle of inserting key frame from first, the number that records the cycle of insert continually key frame is the first number; When the first number is more than or equal to the second predetermined threshold value, promote the grade of the coding parameter of current use.
Preferably, determine whether also to comprise after current period interpolation enters key frame whether being greater than the first predetermined threshold value according to network performance index: if network performance index is less than the first predetermined threshold value, the code check of the video data that continues to keep current; From first, do not insert the cycle of key frame, it is the second number that record does not insert the number in the cycle of key frame continuously; When the second number is more than or equal to the 3rd predetermined threshold value, reduce the grade of the coding parameter of current use.
A kind of adjusting device of video data transmitting is provided according to a further aspect in the invention.
According to the adjusting device of video data transmitting of the present invention, comprise: the first determination module, for determining whether, enter the cycle, this cycle is the time period of default insertion key frame; The second determination module, for determining whether to enter key frame in current period interpolation according to the network operation state information getting, wherein, enters key frame for regulating the code check of video data in current period interpolation.
Preferably, the second determination module comprises: acquiring unit, and for obtaining the network performance index in current period, wherein, it is one of following that network performance index at least comprises: bandwidth availability ratio, network packet loss rate, transmission delay; Determining unit, for whether be greater than the first predetermined threshold value according to network performance index determines whether to enter key frame in current period interpolation.
Preferably, acquiring unit comprises: the first detection sub-unit, for detect respectively the shared bandwidth of current network bandwidth and transmitting video data in current period; The first computation subunit, for calculating the difference of the shared bandwidth of current network bandwidth and transmitting video data or calculating the shared bandwidth of transmitting video data and the ratio of current network bandwidth, obtains bandwidth availability ratio.
Preferably, acquiring unit comprises: the second detection sub-unit, the total amount of packet and the quantity of the packet that receiving terminal receives that for detect respectively transmitting terminal in current period, send; The second computation subunit, for the quantity computing network packet loss with the packet receiving according to the total amount of the packet sending.
Preferably, acquiring unit comprises: the 3rd detection sub-unit, and the very first time and the detection transmitting terminal that for detect transmitting terminal in current period, send every frame video packets of data receive receiving terminal in the second time that receives the confirmation bag feeding back after every frame video packets of data; The 3rd computation subunit, for according to the very first time and the second Time Calculation transmission delay.
Preferably, said apparatus also comprises: the first processing module, for when network performance index is greater than or equal to the first predetermined threshold value, enters key frame in current period interpolation; The first logging modle, for the cycle of inserting key frame from first, the number that records the cycle of insert continually key frame is the first number; The first adjusting module, for when the first number is more than or equal to the second predetermined threshold value, promotes the grade of the coding parameter of current use.
Preferably, said apparatus also comprises: the second processing module, if be less than the first predetermined threshold value for network performance index, continues the code check of the current video data of maintenance; The second logging modle, for not inserting the cycle of key frame from first, it is the second number that record does not insert the number in the cycle of key frame continuously; The second adjusting module, for when the second number is more than or equal to the 3rd predetermined threshold value, reduces the grade of the coding parameter of current use.
By the present invention, adopt periodically Sampling network running state information, and when arriving, the cycle of default insertion key frame determines whether to enter key frame in current period interpolation according to the current network operation state information getting, in current period interpolation, entering key frame can regulate the code check of video data, the shared bandwidth of video data of transmitting with the dynamic adjustment according to the state information of wireless network bandwidth, solved and in correlation technique, cannot control preferably the problem that the shared bandwidth of the video data that transmitting and wireless network bandwidth dynamically adapt, and then timely by periodically inserting key frame, effectively controlling shared bandwidth and the wireless network bandwidth of video data transmitting dynamically adapts.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the structured flowchart of the video wireless remote prebrowsing system of correlation technique;
Fig. 2 is according to the flow chart of the control method of the video data transmitting of the embodiment of the present invention;
Fig. 3 is the flow chart of dynamic bandwidth self-adaptation control method according to the preferred embodiment of the invention;
Fig. 4 is according to the structured flowchart of the adjusting device of the video data transmitting of the embodiment of the present invention;
Fig. 5 is the structured flowchart of the adjusting device of video data transmitting according to the preferred embodiment of the invention;
Fig. 6 is the structured flowchart of the vehicle-mounted monitoring equipment in long-range according to the preferred embodiment of the invention prebrowsing system.
Embodiment
Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
In the following description, except as otherwise noted, otherwise with reference to the symbol of the action of being carried out by one or more computers and operation, represent to describe each embodiment of the application.Wherein, computer comprises the various products such as personal computer, server, mobile terminal, and the equipment that has used CPU, single-chip microcomputer, DSP etc. to have process chip all can be called computer.Thus, be appreciated that and be sometimes called as processing unit that this class action that computer carries out and operation comprise computer to represent the manipulation of the signal of telecommunication of data with structured form.This manipulation transforms on data or the position in the accumulator system of computer, safeguard it, the operation of computer is reshuffled or changed to this mode of all understanding with those skilled in the art.The data structure of service data is the physical location of memory with the defined particular community of form of data.Yet although describe the present invention in above-mentioned context, it does not also mean that restrictively, as understood by those skilled in the art, the each side of hereinafter described action and operation also available hardware realizes.
Turn to accompanying drawing, wherein identical reference number refers to identical element, and the application's principle is shown in a suitable computing environment and realizes.Below describe the embodiment of the application based on described, and should not think the alternative embodiment about clearly not describing herein and limit the application.
Following examples can be applied in computer, for example: be applied in PC.Also can be applied to current employing in the mobile terminal in intelligent operating system, and be not limited to this.Operating system for computer or mobile terminal does not have specific (special) requirements, as long as can detect contact, determine whether this contact is consistent with pre-defined rule, and realizes corresponding function according to the attribute of this contact.
Fig. 2 is according to the flow chart of the control method of the video data transmitting of the embodiment of the present invention.As shown in Figure 2, the method can comprise following treatment step:
Step S202: determine whether to enter the cycle, this cycle is the time period of default insertion key frame;
Step S204: determine whether to enter key frame in current period interpolation according to the network operation state information getting, wherein, enter key frame for regulating the code check of video data in current period interpolation.
In correlation technique, cannot control preferably shared bandwidth and the wireless network bandwidth of video data transmitting and dynamically adapt.Adopt method as shown in Figure 2, periodically Sampling network running state information (for example: the utilance of the network bandwidth, packet loss in video data transmitting process), and when arriving, the cycle of default insertion key frame determines whether to enter key frame in current period interpolation according to the current network operation state information getting, in current period interpolation, entering key frame can regulate the code check of video data, the shared bandwidth of video data of transmitting with the dynamic adjustment according to the state information of wireless network bandwidth, solved and in correlation technique, cannot control preferably the problem that the shared bandwidth of the video data that transmitting and wireless network bandwidth dynamically adapt, and then timely by periodically inserting key frame, effectively controlling shared bandwidth and the wireless network bandwidth of video data transmitting dynamically adapts.
In preferred implementation process, the interval that can calculate adjacent key frame under initial condition according to default frame per second, wherein, can comprise a plurality of cycles in this interval.
Because key frame packet has contained all information of display frame needs, therefore, all video datas all at least comprise a key frame, as first frame of video file.Generally, within each second, video data at least needs to use a key frame.And other key frame can be used for improving the quality of video, the quantity that still increases key frame can increase the size of video file, also can increase the shared network bandwidth of transmitting video data and offered load simultaneously.
Frame per second is to have how many frames in the video of playing for a second, and frame is the base unit that forms video.Video file itself is comprised of a lot of continuous pictures, simply can be understood as frame per second is exactly that (in fact these pictures are by compressing for the picture number under record in a second, what one frame data were not necessarily preserved is a full picture key frame, and it is the important frame in interframe compression coding.The interval adjusting of I frame can have influence on picture group (Group of Pictures, referred to as GOP) length, and then have influence on the speed that reads GOP, if it is excessive that I frame period arranges, in the occasion that must use I frame, just may be forced to replace with front and back reference frame (B frame)/forward reference frame (P frame), so just can reduce the quality of whole picture.I frame is the basis of interframe compression, and for example: a typical gop structure is IBBPBBPBBPBBPBBPBB, B frame need to add the variation of this frame with reference to the data of front and back two frames and draw the data of this frame, and the explanation of P frame need to be with reference to B frame.Suppose that I frame damages, so whole gop structure all cannot be used, IBBPBBPBBPBBPBBPBB so multiframe will be slatterned together.
According to video coding algorithm, I frame data are being compressed to data volume after processing and are obviously being greater than the video pictures of B frame and P frame, by increasing the frequency of I frame when the Video coding, can realize and increase the target that video pictures shows response speed.Coding headend equipment is realized, and can change the frequency of I frame by this mode, has increased the quantity of I frame in video data stream simultaneously, and then has increased the video code flow after coding, can cause thus increasing the demand of video data to the network bandwidth.As can be seen here, do not change video data to the prerequisite of network bandwidth requirements under, can significantly reduce the time interval that the video pictures of video data shows, realizing video data instant playback is problem demanding prompt solution.
Code stream (Data Rate), is also code check, refers to the data traffic that video file is used within the unit interval, its be in Video coding image quality control in most important part.In the situation that resolution is identical, the code stream of video file is larger, and compression ratio is just less, and image quality is just higher.
In correlation technique, first can carry out sample code to video data stream, then with fixed interval, send I frame.Conventionally adopt H.264 form to encode to produce some I frames and some P frames, wherein, the common picture group (GOP) that forms of an I frame and several P frames, due in order to make client terminal receive as soon as possible I frame, it will be appreciated by those skilled in the art that, by encoder, generating coded frame (this coded frame can comprise some I frames and each self-corresponding some P frames of each I frame) afterwards, preferentially generating I frame and send.In concrete implementation, first send first I frame, after first I frame data start to send, interval set time T, then start to send next I frame data, constantly repeat until all I frame data end of transmissions of video data stream, wherein, the interval of I frame is determined by GOP, is exactly the time that picture group is shared, for example: when GOP is 100, between two I frames, be spaced apart 100 frames.If coding 25 frames per second H.264, from a upper I frame be generated to next I frame generate need 100 frame/25 frames per second=4 seconds, therefore, above-mentioned time T is exactly 4 seconds, the transmitting time of former and later two I frames is 4 seconds.In these 4 seconds, the network bandwidth is for transmitting some P frames that each I frame is corresponding, due in a picture group, I frame is key frame, therefore, higher for the transmission preferences rank of I frame, in order to guarantee within every 4 seconds, have an I frame to send, the transmission of the some P frames corresponding with I frame can be delayed.If the transmission of I frame is guaranteed, in the very first time, send and can guarantee that receiving terminal just can receive I frame as soon as possible, thereby carries out decoding work with displaying video at lasting interval set time transmission I frame.
In the preferred embodiment, before video data starts transmission, can adjust the coding parameter of acquiescence, can I frame period be arranged to relatively large numerical value according to predefined frame per second and (be greater than 1 second or 4 seconds that in correlation technique, conventionally adopts, can on digital video recorder, set in advance the transmission frame per second of video data stream and the fixed proportion of I frame period is K), now code check can reduce relatively, and when video complexity is higher, the dynamic effect of picture can become relatively poor.Although I frame period is configured to relatively large numerical value under initial situation, therefore the dynamic effect of picture can be affected, but be accompanied by the network operation state information constantly getting and can periodically dynamically insert I frame, and then change I frame period, regulate the code check of video data.
It should be noted that, because I frame period is configured to relatively large numerical value, therefore, the cycle that can comprise a plurality of default insertion I frames in I frame period, for example: according to predefined frame per second, I frame period can be arranged to 10 seconds, and the cycle of default insertion I frame is 5 seconds, in so above-mentioned I frame period, can comprise the cycle of 2 default insertion I frames.And the number in the cycle specifically comprising need to specifically be set according to actual conditions.
Preferably, in step S204, according to the network operation state information getting, determine whether that in current period interpolation, entering key frame can comprise following operation:
Step S1: obtain the network performance index in current period, wherein, it is one of following that network performance index can at least include but not limited to: bandwidth availability ratio, network packet loss rate, transmission delay;
Step S2: whether be greater than the first predetermined threshold value according to network performance index and determine whether to enter key frame in current period interpolation.
Preferably, in step S1, obtaining network performance index can comprise the following steps:
Step S11: detect respectively the shared bandwidth of current network bandwidth and transmitting video data in current period;
Step S12: calculate the difference of the shared bandwidth of current network bandwidth and transmitting video data or calculate the shared bandwidth of transmitting video data and the ratio of current network bandwidth, obtaining bandwidth availability ratio.
Preferably, in step S1, obtaining network performance index can comprise the following steps:
Step S13: detect respectively the total amount of packet and the quantity of the packet that receiving terminal receives that transmitting terminal sends in current period;
Step S14: the quantity computing network packet loss according to the total amount of the packet sending with the packet receiving.
Preferably, in step S1, obtaining network performance index can comprise the following steps:
Step S15: detect transmitting terminal and send the very first time of every frame video packets of data and detect transmitting terminal and receive receiving terminal in the second time that receives the confirmation bag feeding back after every frame video packets of data in current period;
Step S16: according to the very first time and the second Time Calculation transmission delay.
In a preferred embodiment, before carrying out video data transmitting, first need to judge whether the shared bandwidth of video data to be sent is greater than Internet Transmission bandwidth capacity.Therefore, can to current network bandwidth (dissimilar network can have the different network bandwidths) and the shared bandwidth of transmitting video data, detect respectively, and according to testing result, ask for the difference of current network bandwidth and the shared bandwidth of transmitting video data, if this difference is greater than or equal to above-mentioned the first predetermined threshold value, illustrate that current network running status is good, bandwidth resources, can be by entering key frame to promote the code check of video data compared with horn of plenty in current period interpolation; If this difference is less than above-mentioned the first predetermined threshold value, illustrate that current network running status is poor, bandwidth resources are comparatively nervous, are not suitable for inserting key frame in current period again, only can keep the code check of current video data.
Certainly, can also directly video data transmitting amount size be compared with Internet Transmission bandwidth capacity.If this video data transmitting amount is less than or equal to Internet Transmission bandwidth capacity, can directly send above-mentioned video data, and if can determine that video data transmitting amount is much smaller than Internet Transmission bandwidth capacity, can enter key frame in current period interpolation; If video data transmitting amount is greater than Internet Transmission bandwidth capacity, above-mentioned video data can be divided into a plurality of packets, so that the size of each packet in a plurality of packet is all less than or equal to Internet Transmission bandwidth capacity.For example: for the network bandwidth, only for for the network environment of 10Kbyte, packet loss just very likely occurs the video data encoding frame of 100Kbyte size in process of transmitting, and then affect the stability of Internet Transmission.Therefore, if the video data encoding frame that will send is larger,, for the network bandwidth of 10Kbyte, video data encoding frame can be divided into a plurality of packets, the size of each packet is 10Kbyte.
Preferably, at step S204, after current period interpolation enters key frame, can also comprise the following steps:
Step S3: if network performance index is greater than or equal to the first predetermined threshold value, enter key frame in current period interpolation;
Step S4: in the cycle of inserting key frame from first, the number that records the cycle of insert continually key frame is the first number;
Step S5: when the first number is more than or equal to the second predetermined threshold value, promote the grade of the coding parameter of current use.
In a preferred embodiment, if enter key frame in current period interpolation, will hold the record within the ensuing continuous a plurality of cycles so number in cycle of inserting key frame, until can determine in certain cycle therein and no longer insert key frame, and whether the number that judges the cycle of insert continually key frame is more than or equal to above-mentioned the second predetermined threshold value, if so, need to promote the grade of the coding parameter of current use, to realize the adjusting to video data rate.
For example: if determined in current (the 1st) cycle interpolation, enter key frame, then within ensuing continuous 4 cycles, (do not comprise the 1st cycle) and hold the record the number in the cycle of inserting key frame, until can determine within the 6th cycle and no longer insert key frame, the number that can draw thus the cycle of insert continually key frame is 5.Whether the number (5) that now, need to judge the cycle of insert continually key frame is more than or equal to above-mentioned the second predetermined threshold value (being assumed to be 5).Because the number in cycle of insert continually key frame equals above-mentioned the second predetermined threshold value, therefore, can promote the grade of the coding parameter of current use, to realize the adjusting to video data rate.
It should be noted that, the grade of the coding parameter of current use can be two or more; If two, be respectively the coding parameter grade of minimalist configuration and the coding parameter grade of acquiescence (the highest) configuration; If a plurality of, can between the coding parameter grade of minimalist configuration and the coding parameter grade of default configuration, set up again a plurality of grades, to realize the code check that more accurately regulates video data.
Preferably, at step S204, after current period interpolation enters key frame, can also comprise following operation:
Step S6: if network performance index is less than the first predetermined threshold value, continue the code check of the current video data of maintenance;
Step S7: do not insert the cycle of key frame from first, it is the second number that record does not insert the number in the cycle of key frame continuously;
Step S8: when the second number is more than or equal to the 3rd predetermined threshold value, reduce the grade of the coding parameter of current use.
In a preferred embodiment, if do not insert key frame in current period, will hold the record within the ensuing continuous a plurality of cycles so number in cycle of not inserting key frame, until can determine in certain cycle therein and need to insert key frame, and judge whether be more than or equal to above-mentioned three predetermined threshold value continuously if not inserting the number in the cycle of key frame, if so, need to reduce the grade of the coding parameter of current use, to realize the adjusting to video data rate.
For example: if can determine within current (the 1st) cycle, do not insert key frame, then within ensuing continuous 4 cycles, (do not comprise the 1st cycle) and all do not insert key frame, therefore the hold the record number in cycle of not inserting key frame, until can determine within the 6th cycle and reinsert key frame, can show that thus not inserting the number in the cycle of key frame is continuously 5.Now, needing judgement whether be more than or equal to above-mentioned three predetermined threshold value (be assumed to be 5) continuously if not inserting the number (5) in the cycle of key frame.Because not inserting the number in the cycle of key frame equals above-mentioned the 3rd predetermined threshold value continuously, therefore, can reduce the grade of the coding parameter of current use, to realize the adjusting to video data rate.
It should be noted that, above-mentioned the first number can be identical with above-mentioned the second number, also can be different; Above-mentioned the second predetermined threshold value can be identical with above-mentioned the 3rd predetermined threshold value, also can be different, need to specifically set according to actual conditions.
Below in conjunction with the preferred implementation shown in Fig. 3, above-mentioned preferred implementation process is further described.
Fig. 3 is the flow chart of dynamic bandwidth self-adaptation control method according to the preferred embodiment of the invention.As shown in Figure 3, the method can comprise following treatment step:
Step S302: vehicle-mounted monitoring equipment is after connecting with remote stream media server, and initialization related resource, prepares to start to send video data; Vehicle-mounted monitoring equipment continues to obtain current network operation state information;
In the preferred embodiment, before video data starts to send, can adjust the coding parameter of acquiescence, mainly be I frame period to be arranged to a very large value according to predefined frame per second, now code check can reduce relatively, and when video complexity is higher, the dynamic effect of picture can become relatively poor.
It should be noted that, the I frame period of above-mentioned setting is not suitable for long, otherwise, will cause the dynamic effect of picture poor, user's visual sensory is difficult to accept.
Step S304: vehicle-mounted monitoring equipment can periodically detect whether arrived the time point that inserts I frame; If so, continue execution step S306; If not, return to step S302;
In the preferred embodiment, vehicle-mounted monitoring equipment can set in advance one-period and be used for video data dynamically to insert I frame, with this, improves definition and the dynamic effect of video data.
Step S306: vehicle-mounted monitoring equipment is after video data starts to send, by continuing, current mobile network is detected and current network operation state information is assessed, but, owing to cannot the bandwidth of network being carried out to qualitative assessment, therefore, the result of final feedback is the binaryzation network operation state with respect to the present network operation state of current transmission video data, after the network operation state information to current is assessed, can determine that current network conditions is good or bad; If current network running status is good, continue execution step S308; If not, forward step S314 to;
Step S308: if assess and can determine that current network conditions is good by the network operation state information to current, illustrate that current network bandwidth can meet the shared bandwidth of video data, can insert I frame in this cycle thus; The number of times that also needs to add up insert continually I frame when inserting I frame, is now designated as insertCount, for assessment of the persistent state of network in a period of time in the past;
In the preferred embodiment, suppose can determine insertion I frame within first cycle, the counting of insertCount becomes 1 from 0, in second period, can determine equally and insert I frame, the counting of insertCount adds 1, from 1, becomes 2, within the 3rd cycle, can also determine and insert I frame, the counting of insertCount continues to add 1, becomes 3 from 2, by that analogy.If can determine and can not insert I frame again but wherein have in one-period, the counting of insertCount stops.
Step S310: whether reach the grade that predetermined threshold value can judge whether to improve coding parameter according to the counting of insertCount; For example, if the counting of insertCount (: 10), can continue to perform step S312 has reached predetermined threshold value; If the counting of insertCount does not also reach predetermined threshold value, can forward step S320 to;
Step S312: improve the grade of coding parameter, for example: the current coding parameter that is in the lowest class can return to this parameter initial default grade; Forward step S302 to;
Step S314: if assessed can determine that current network conditions is poor time by the network operation state information to current, illustrate that current network bandwidth is difficult to meet the shared bandwidth of video data, can determine at current period and not insert I frame thus, with this, reduce the code check of video data; When not inserting I frame, also need statistics not insert continuously the number of times of I frame, be now designated as notInsertCount, the same persistent state for assessment of network in a period of time in the past;
Step S316: whether reach the grade that predetermined threshold value can judge whether to improve coding parameter according to the counting of notInsertCount; For example, if the counting of notInsertCount (: 10), can continue to perform step S318 has reached predetermined threshold value; If the counting of notInsertCount does not also reach predetermined threshold value, in current period, do not insert I frame, forward step S302 to;
Step S318: for example, when notInsertCount (: in the time of 10) reaches predetermined threshold value, illustrate that current network condition is very poor, smooth transmission cannot be carried out in the interval that the initial maximum arranging is inserted I frame, now need informed code device to change coding parameter, reduce the current service rating of coding parameter, for example: reduce limit bit rate, reduce frame per second; Until coding parameter is down to minimum service rating; Forward step S302 to;
It should be noted that, even if be in the situation of above-mentioned reduction service rating (comprising the lowest class), yet need periodically according to the network operation state information detecting in real time, to judge whether to carry out the operation of inserting I frame.
Step S320: continue to carry out the operation of inserting I frame; Forward step S302 to.
Fig. 4 is according to the structured flowchart of the adjusting device of the video data transmitting of the embodiment of the present invention.As shown in Figure 4, the adjusting device of this video data transmitting can comprise: the first determination module 10, for determining whether, enter the cycle, and this cycle is the time period of default insertion key frame; The second determination module 20, for determining whether to enter key frame in current period interpolation according to the network operation state information getting, wherein, enters key frame for regulating the code check of video data in current period interpolation.
Adopt device as shown in Figure 4, by acquisition module, periodically Sampling network running state information is (for example: the utilance of the network bandwidth, packet loss in video data transmitting process), and the current network operation state information that can get according to acquisition module when the cycle of default insertion key frame arrives by determination module determines whether to enter key frame in current period interpolation, in current period interpolation, entering key frame can regulate the code check of video data, the shared bandwidth of video data of transmitting with the dynamic adjustment according to the state information of wireless network bandwidth, solved thus and in correlation technique, cannot control preferably the problem that the shared bandwidth of the video data that transmitting and wireless network bandwidth dynamically adapt, and then timely by periodically inserting key frame, effectively controlling shared bandwidth and the wireless network bandwidth of video data transmitting dynamically adapts.
Preferably, as shown in Figure 5, the second determination module 20 can comprise: acquiring unit 200, and for obtaining the network performance index in current period, wherein, it is one of following that network performance index at least comprises: bandwidth availability ratio, network packet loss rate, transmission delay; Determining unit 202, for whether be greater than the first predetermined threshold value according to network performance index determines whether to enter key frame in current period interpolation.
Preferably, as shown in Figure 5, acquiring unit 200 can comprise: the first detection sub-unit (not shown), for detect respectively the shared bandwidth of current network bandwidth and transmitting video data in current period; The first computation subunit (not shown), for calculating the difference of the shared bandwidth of current network bandwidth and transmitting video data or calculating the shared bandwidth of transmitting video data and the ratio of current network bandwidth, obtains bandwidth availability ratio.
Preferably, as shown in Figure 5, acquiring unit 200 can comprise: the second detection sub-unit (not shown), the total amount of packet and the quantity of the packet that receiving terminal receives that for detect respectively transmitting terminal in current period, send; The second computation subunit (not shown), for the quantity computing network packet loss with the packet receiving according to the total amount of the packet sending.
Preferably, as shown in Figure 5, acquiring unit 200 can comprise: the 3rd detection sub-unit (not shown), and the very first time and the detection transmitting terminal that for detect transmitting terminal in current period, send every frame video packets of data receive receiving terminal in the second time that receives the confirmation bag feeding back after every frame video packets of data; The 3rd computation subunit (not shown), for according to the very first time and the second Time Calculation transmission delay.
Preferably, as shown in Figure 5, said apparatus can also comprise: the first processing module 30, for when network performance index is greater than or equal to the first predetermined threshold value, enters key frame in current period interpolation; The first logging modle 40, for the cycle of inserting key frame from first, the number that records the cycle of insert continually key frame is the first number; The first adjusting module 50, for when the first number is more than or equal to the second predetermined threshold value, promotes the grade of the coding parameter of current use.
Preferably, as shown in Figure 5, said apparatus can also comprise: the second processing module 60, if be less than the first predetermined threshold value for network performance index, continues the code check of the current video data of maintenance; The second logging modle 70, for not inserting the cycle of key frame from first, it is the second number that record does not insert the number in the cycle of key frame continuously; The second adjusting module 80, for when the second number is more than or equal to the 3rd predetermined threshold value, reduces the grade of the coding parameter of current use.
Fig. 6 is the structured flowchart of the vehicle-mounted monitoring equipment in long-range according to the preferred embodiment of the invention prebrowsing system.As shown in Figure 6, this vehicle-mounted monitoring equipment can comprise following four parts: image coding module, structured video data transmitting module, network state detection module (being equivalent to above-mentioned acquisition module) and video data control module (being equivalent to the remainder except acquisition module in the adjusting device of above-mentioned video data transmitting).Image Coding is processed normally and is responsible for by digital signal processor (Digital Signal Processor, referred to as DSP); The transmission of video data can be used transmission control protocol (Transfer Control Protocol, referred to as TCP) or User Data Protocol (User Date Protocol, referred to as UDP) by wireless network, to streaming media server, send video data; Network state detection can judge network operation state by technology such as Sampling network buffering area, transmission delays; It is the core of technical scheme provided by the present invention that video data transmitting is controlled, and is for realizing the adaptive main modular of dynamic network in vehicle-mounted monitoring equipment.Concrete implementation about the vehicle-mounted monitoring equipment in long-range prebrowsing system is as follows:
Before video data starts to send, video data control module can be adjusted the coding parameter of acquiescence, can I frame period be arranged to a very large value according to predefined frame per second, now code check can reduce relatively, and when video complexity is higher, the dynamic effect of picture can become relatively poor.Vehicle-mounted monitoring equipment after connecting with remote stream media server, initialization related resource.Image coding module can be carried out sample code to video data stream, then video data encoding frame is sent to structured video data transmitting module, and structured video data transmitting module prepares to start to send video data.Network state detection module in vehicle-mounted monitoring equipment continues to obtain current network operation state, and video data control module can periodically detect whether arrived the time point that inserts I frame; If, network state detection module is after video data starts to send, by continuing, current mobile network is detected and current network operation state is assessed, but, owing to cannot the bandwidth of network being carried out to qualitative assessment, therefore, the result of final feedback is the binaryzation network operation state with respect to the present network operation state of current transmission video data, after the network operation state to current is assessed, can determine that current network conditions is good or bad; If assess and can determine that current network conditions is good by the network operation state to current, illustrate that current network bandwidth can meet the shared bandwidth of video data, can insert I frame in this cycle thus; The number of times that also needs to add up insert continually I frame when inserting I frame, for assessment of the persistent state of network in a period of time in the past; If assessed can determine that current network conditions is poor time by the network operation state to current, illustrate that current network bandwidth is difficult to meet the shared bandwidth of video data, can determine at current period and not insert I frame thus, with this, reduce the code check of video data; When not inserting I frame, also need statistics not insert continuously the number of times of I frame, the same persistent state for assessment of network in a period of time in the past.Whether video data control module can reach predetermined threshold value and then judge whether to improve the grade of coding parameter according to the number of times of statistics insert continually I frame; For example, for example, if this counting (: 10), can improve the grade of coding parameter: the current coding parameter that is in the lowest class can return to this parameter initial default grade has reached predetermined threshold value; If this counting does not also reach predetermined threshold value, can continue to carry out the operation of inserting I frame.Thereby whether video data control module can also reach the grade that predetermined threshold value judges whether to improve coding parameter according to the continuous number of times that does not insert I frame of statistics; For example, if this counting (: 10) has reached predetermined threshold value, illustrate that current network condition is very poor, smooth transmission cannot be carried out in the interval that the initial maximum arranging is inserted I frame, now need informed code device to change coding parameter, reduce the current service rating of coding parameter, for example: reduce limit bit rate, reduce frame per second; Until coding parameter is down to minimum service rating; If this counting does not also reach predetermined threshold value, in current period, do not insert I frame, then by network state detection module, continue Real-time Obtaining network operation state information.
It should be noted that, even if be in the situation of above-mentioned reduction service rating (comprising the lowest class), yet need periodically according to the network operation state information detecting in real time, to judge whether to carry out the operation of inserting I frame.
Adopt the vehicle-mounted monitoring equipment in long-range prebrowsing system as shown in Figure 6, in the performance optimization of wireless video data network transmission, the control method method that also use reduces or increase Image Coding parameter grade combines with it that has proposed first dynamic insertion I frame has realized the bandwidth self-adaption of changeable wireless network environment, contrast with correlation technique, can obtain better image fluency, lower code check, higher reduction code check response speed and method be simple, effectively, be convenient to transplant.
From above description, can find out, above-described embodiment has been realized following technique effect (it should be noted that these effects are effects that some preferred embodiment can reach): adopt technical scheme provided by the present invention can when the network bandwidth reduces, carry out shared bandwidth and the wireless network bandwidth of video data that adjustment control is being transmitted automatically and dynamically adapt, to guarantee in video image real-time, can avoid the dynamic continuity of video data to be a greater impact, in its adjustment process, can not produce new I frame, video data can effectively reduce to adapt to the variation of the network bandwidth.Through actual test proof, adopt the control system of this technical scheme simple in structure, control effectively, can obviously improve the performance of remote wireless video preview.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (14)
1. a control method for video data transmitting, is characterized in that, comprising:
Determine whether to enter the cycle, the described cycle is the time period of default insertion key frame;
According to the network operation state information getting, determine whether to insert described key frame in current period, wherein, in described current period, insert described key frame for regulating the code check of described video data.
2. method according to claim 1, is characterized in that, according to the described network operation state information getting, determines whether in described current period, to insert described key frame, comprising:
Obtain the network performance index in described current period, wherein, it is one of following that described network performance index at least comprises: bandwidth availability ratio, network packet loss rate, transmission delay;
According to described network performance index, whether be greater than the first predetermined threshold value and determine whether to insert described key frame in described current period.
3. method according to claim 2, is characterized in that, obtains described network performance index and comprises:
In described current period, detect respectively the shared bandwidth of current network bandwidth and transmitting video data;
Calculate the difference of the described current network bandwidth bandwidth shared with transmitting described video data or calculate the shared bandwidth of the described video data of transmission and the ratio of described current network bandwidth, obtaining described bandwidth availability ratio.
4. method according to claim 2, is characterized in that, obtains described network performance index and comprises:
In described current period, detect respectively the total amount of packet and the quantity of the packet that receiving terminal receives that transmitting terminal sends;
According to the total amount of the packet of described transmission with described in the quantity of the packet that receives calculate described network packet loss rate.
5. method according to claim 2, is characterized in that, obtains described network performance index and comprises:
In described current period, detecting transmitting terminal sends the very first time of every frame video packets of data and detects described transmitting terminal and receive receiving terminal in the second time that receives the confirmation bag feeding back after described every frame video packets of data;
According to transmission delay described in the described very first time and described the second Time Calculation.
6. according to the method described in any one in claim 2 to 5, it is characterized in that according to described network performance index, whether being greater than after described the first predetermined threshold value determines whether to insert described key frame in described current period, also comprise:
If described network performance index is greater than or equal to described the first predetermined threshold value, in described current period, insert described key frame;
In the cycle of inserting described key frame from first, the number that records the cycle of key frame described in insert continually is the first number;
When described the first number is more than or equal to the second predetermined threshold value, promote the grade of the coding parameter of current use.
7. according to the method described in any one in claim 2 to 5, it is characterized in that according to described network performance index, whether being greater than after described the first predetermined threshold value determines whether to insert described key frame in described current period, also comprise:
If described network performance index is less than described the first predetermined threshold value, continue the code check of the current video data of maintenance;
From first, do not insert the cycle of described key frame, it is the second number that record does not insert the number in the cycle of described key frame continuously;
When described the second number is more than or equal to the 3rd predetermined threshold value, reduce the grade of the coding parameter of current use.
8. an adjusting device for video data transmitting, is characterized in that, comprising:
The first determination module, enters the cycle for determining whether, the described cycle is the time period of default insertion key frame;
The second determination module for determining whether to insert described key frame according to the network operation state information getting in current period, wherein, inserts described key frame for regulating the code check of described video data in described current period.
9. device according to claim 8, is characterized in that, described the second determination module comprises:
Acquiring unit, for obtaining the network performance index in described current period, wherein, it is one of following that described network performance index at least comprises: bandwidth availability ratio, network packet loss rate, transmission delay;
Determining unit, determines whether to insert described key frame in described current period for whether be greater than the first predetermined threshold value according to described network performance index.
10. device according to claim 9, is characterized in that, described acquiring unit comprises:
The first detection sub-unit, for detecting respectively the shared bandwidth of current network bandwidth and transmitting video data in described current period;
The first computation subunit, for calculating the difference of the shared bandwidth of described current network bandwidth and the described video data of transmission or calculating the shared bandwidth of the described video data of transmission and the ratio of described current network bandwidth, obtains described bandwidth availability ratio.
11. devices according to claim 9, is characterized in that, described acquiring unit comprises:
The second detection sub-unit, the total amount of packet and the quantity of the packet that receiving terminal receives that for detect respectively transmitting terminal in described current period, send;
The second computation subunit, for according to the total amount of the packet of described transmission with described in the quantity of the packet that receives calculate described network packet loss rate.
12. devices according to claim 9, is characterized in that, described acquiring unit comprises:
The 3rd detection sub-unit, sends the very first time of every frame video packets of data and detects described transmitting terminal and receive receiving terminal in the second time that receives the confirmation bag feeding back after described every frame video packets of data for detect transmitting terminal in described current period;
The 3rd computation subunit, for according to transmission delay described in the described very first time and described the second Time Calculation.
13. according to the device described in any one in claim 9 to 12, it is characterized in that, described device also comprises:
The first processing module for when described network performance index is greater than or equal to described the first predetermined threshold value, is inserted described key frame in described current period;
The first logging modle, for inserting the cycle of described key frame from first, the number that records the cycle of key frame described in insert continually is the first number;
The first adjusting module, for when described the first number is more than or equal to the second predetermined threshold value, promotes the grade of the coding parameter of current use.
14. according to the device described in any one in claim 9 to 12, it is characterized in that, described device also comprises:
The second processing module, if be less than described the first predetermined threshold value for described network performance index, continues the code check of the current video data of maintenance;
The second logging modle, for not inserting the cycle of described key frame from first, it is the second number that record does not insert the number in the cycle of described key frame continuously;
The second adjusting module, for when described the second number is more than or equal to the 3rd predetermined threshold value, reduces the grade of the coding parameter of current use.
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