CN101888544B - Low-bandwidth video data transmission method and hard disk video recorder - Google Patents
Low-bandwidth video data transmission method and hard disk video recorder Download PDFInfo
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Abstract
The invention discloses a low-bandwidth video data transmission method and a hard disk video recorder. The method comprises the following steps of: sending an RTP (real-time transport protocol) packet to a monitoring client through UDP and caching the RPT packet and an identifier of the RTP packet, wherein video data is encapsulated in the RTP packet; and if an RTCP (real-time transport control protocol) packet which is returned by the monitoring client and carries the identifier of the RTP packet is not received within the pre-set time after the RTP packet is sent, retransmitting the cached RTP packet again. On the basis of transmitting the video data by using the UDP, whether the monitoring client successfully receives the RTP packet is confirmed according to whether an application layer can receive the RTCP packet carrying the identifier of the RTP packet; and if confirmation information is not received within the pre-set time, the RTP packet is retransmitted, so that the transmission reliability of the video data in a low-bandwidth network is improved.
Description
Technical field
The present invention relates to field of data transmission, particularly relate to a kind of method of transmitting video data and DVR of low bandwidth.
Background technology
Existing safety defense monitoring system generally comprises DVR (Digital Video Recorder, digital hard disc video recorder) and monitor client.Wherein, DVR is the computer system that a cover can carry out view data, voice data stores processor, has the function of long-time video recording, recording; Monitor client can Long-distance Control DVR, and realizes telemonitoring through DVR.
Pass back when carrying out preview in DVR monitoring in real time and with the video data that monitoring obtains to monitor client; Usually adopt RTP (Real-time Transport Protocol; RTP) video data is encapsulated, use TCP (Transmission Control Protocol, transmission control protocol) or UDP (User Datagram Protocol then; UDP) transmit, said video data comprises view data and/or voice data etc.
Use the TCP transmission can guarantee reliability of video data transmission, but the congestion control mechanism of TCP can not effectively utilize available bandwidth, when the network bandwidth is lower, just is not suitable for.
Though use the UDP transmission to reduce network overhead, can adapt to low bandwidth, because the unreliability of UDP transmission itself, making monitor client obtain video data can't be protected, and influences the preview effect.
Summary of the invention
The method of transmitting video data and the DVR that the purpose of this invention is to provide a kind of low bandwidth are to improve reliability of video data transmission in low-bandwidth network.
The invention provides a kind of method of transmitting video data of low bandwidth, said method comprises:
Send the realtime transmission protocol RTP bag through UDP to monitor client, and the sign of said RTP bag of buffer memory and said RTP bag, be packaged with video data in the said RTP bag;
If after said RTP bag sends, surpass the RTCP Real-time Transport Control Protocol RTCP bag that carries said RTP bag sign that Preset Time does not receive that monitor client returns, then retransmit the said RTP bag of buffer memory.
The present invention also provides a kind of DVR of low bandwidth, comprising:
Cache module is used for the realtime transmission protocol RTP bag of buffer memory transmission and the sign that said RTP wraps, and is packaged with video data in the said RTP bag;
Sending module; Be used for sending said RTP bag to monitor client through UDP; And said RTP bag send that the back surpasses that Preset Time do not receive that monitor client returns carry the RTCP Real-time Transport Control Protocol RTCP bag of said RTP bag sign the time, retransmit the said RTP bag of cache module buffer memory.
The method of transmitting video data of low bandwidth of the present invention and DVR; On the basis of adopting the UDP transmitting video data; Can receive that through application layer the RTCP bag that carries RTP bag sign receives said RTP bag to monitor client and whether successfully confirms; If the overtime confirmation of not receiving is then retransmitted said RTP bag, improved reliability of video data transmission in low-bandwidth network.
Description of drawings
Fig. 1 is the schematic flow sheet of first embodiment of the method for transmitting video data of low bandwidth of the present invention;
Fig. 2 is the schematic flow sheet of second embodiment of the method for transmitting video data of low bandwidth of the present invention;
Fig. 3 is the schematic flow sheet of the 3rd embodiment of the method for transmitting video data of low bandwidth of the present invention;
Fig. 4 is the schematic flow sheet of step S304;
Fig. 5 is the structural representation of DVR of the present invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the embodiment of the invention done further detailed explanation.
Embodiment one
Present embodiment provides a kind of method of transmitting video data of low bandwidth, and is as shown in Figure 1, comprises the steps:
S101 sends the RTP bag through UDP to monitor client, and the sign of said RTP bag of buffer memory and said RTP bag, is packaged with video data in the said RTP bag.
Said video data comprises view data and/or voice data etc.DVR sends the RTP bag to monitor client, and the server of DVR also can the said RTP bag of buffer memory and the sign of said RTP bag, and RTP bag and said RTP bag are identified at can be with the form buffer memory of chained list in the server.DVR sends the sign of RTP bag and said RTP bag of server buffer and said RTP bag can carry out simultaneously, also can successively carry out.The time point that server sends with RTP bag carries out timing as starting point to the said RTP bag and the said RTP bag identification record of buffer memory.
RTP bag sign is carried in the RTP bag, and the content (comprising RTP bag sign) that server can wrap RTP and RTP wraps after unpacking is buffered in the clauses and subclauses of chained list, identifies and can wrap by unique definite RTP based on the RTP bag.RTP bag sign can be for comprising the sequence of numeral, letter and/or symbol etc.RTP bag sign is preferably Bao Xu, and Bao Xu identifies with 16 bits (0～65535), can recycle, and for real-time Transmission, the situation that the bag preface repeats in the spatial cache of server can not occur.Said server can be integrated with DVR, also can be connected with DVR is external, and the present invention does not do qualification to this.
S102 if after said RTP bag sends, surpasses RTCP (RTP Control Protocol, the RTCP Real-time Transport Control Protocol) bag that carries said RTP bag sign that Preset Time does not receive that monitor client returns, and then retransmits the said RTP bag of buffer memory.
Monitor client can return a RTCP bag that carries the sign of said RTP bag to server after receiving the RTP bag, be used to inform that DVR has successfully received said RTP bag.Do not receive the RTCP bag that carries said RTP bag sign if DVR surpasses Preset Time after a certain RTP bag sends, it is overtime to think that then this RTP wraps, and the RTP bag of buffer memory is retransmitted.
When spatial cache is enough big, can carry out buffer memory to all RTP bag and RTP bag sign, and a mark done in the record of the buffer memory RTP bag that in Preset Time, receives RTP bag sign, not distinguish with receiving the record that the RTP bag identifies as yet.Usually; Consider the real-time characteristics of video Data Transmission and the actual conditions of the network bandwidth; The spatial cache that distributes on the server is limited, and is therefore preferred, also comprises: if in the Preset Time after said RTP bag sends; Receive the RTCP bag that carries said RTP bag sign that monitor client returns, then delete the said RTP bag sign of buffer memory and corresponding RTP bag thereof.
After the monitored client of certain RTP bag of confirming buffer memory successfully received, the sign that just can delete the RTP bag and the said RTP bag of this buffer memory discharged the spatial cache that said RTP bag takies.
Then as shown in Figure 2, the method for transmitting video data of said low bandwidth comprises the steps:
S201 sends the RTP bag through UDP to monitor client, and the sign of said RTP bag of buffer memory and said RTP bag, is packaged with video data in the said RTP bag;
S202 judges whether the RTCP bag that carries said RTP bag sign of receiving that monitor client returns;
Do not receive said RTCP bag if send the back above Preset Time, then carry out S203: the said RTP bag of retransmitting buffer memory at said RTP bag; If after said RTP bag sends, receive said RTCP bag, then execution in step S204 in the Preset Time: the said RTP bag sign of deletion buffer memory and the RTP bag of correspondence thereof.
Preferably, the RTCP bag that carries RTP bag sign wraps for APP (Application Specific Functions, special applications function).The self-defined use of the APP former application program before this of bag, among the present invention it is received the successful interaction message of RTP as affirmation and use.
Certainly, also can return a kind of interaction message of redetermination in the RTCP bag of DVR at monitor client, it can carry the sign of the RTP bag that monitor client receives, but need do some adjustment to host-host protocol.
Because the congestion control mechanism of TCP can not effectively utilize available bandwidth, for low bandwidth transmitting video data and inapplicable.And present embodiment has made full use of the little characteristics of UDP network overhead; Can receive that through application layer the RTCP bag that carries RTP bag sign receives said RTP bag to monitor client and whether successfully confirms; About tens bytes of RTCP bag size, very little to the expense of low-bandwidth network, therefore; In low-bandwidth network, can guarantee reliability of video data transmission, and effectively utilize available bandwidth.
The method of transmitting video data of the low bandwidth of present embodiment; On the basis of adopting the UDP transmitting video data; Can receive that through application layer the RTCP bag that carries RTP bag sign receives said RTP bag to monitor client and whether successfully confirms; If the overtime confirmation of not receiving is then retransmitted said RTP bag, improved reliability of video data transmission in low-bandwidth network.And, about tens bytes of RTCP bag size of carrying RTP bag Bao Xu are than the loaded down with trivial details affirmation interaction message of TCP, very little to the expense of low-bandwidth network.
Embodiment two
Present embodiment provides a kind of method of transmitting video data of low bandwidth, and is as shown in Figure 3, comprises the steps:
S301 sends the RTP bag through UDP to monitor client, and the sign of said RTP bag of buffer memory and said RTP bag, is packaged with video data in the said RTP bag;
S302 if after said RTP bag sends, surpasses the RTCP Real-time Transport Control Protocol RTCP bag that carries said RTP bag sign that Preset Time does not receive that monitor client returns, and then retransmits the said RTP bag of buffer memory;
S303 if in the Preset Time after said RTP bag sends, receives the RTCP bag that carries said RTP bag sign that monitor client returns, and then deletes the said RTP bag sign of buffer memory and corresponding RTP bag thereof.
S304 is according to the transmission code rate of network bandwidth adjustment video data.
Because the network bandwidth is to reflect through phenomenons such as packet loss, network delays, therefore as shown in Figure 4, step S304 can comprise:
S3041: when packet loss occurring, then get into S3043: reduce transmission code rate.
So-called packet loss; The RTP bag that refers to buffer memory on the server reaches at full capacity; When the RTP of follow-up transmission bag also will be cached in the server, even the RTP of front bag does not also receive the RTCP bag of affirmation and deletes, but because spatial cache is full; Server can be lost the RTP bag that comes the front, and the RTP bag of back is put into spatial cache.
Packet loss occurs, then mean the transmission code rate of the current DVR of network bandwidth incompatibility, need to reduce transmission code rate, reduce network burden.
When packet loss not occurring, S3042 adds up the overall variation trend of network delay of the RTP bag of said preset number, and obtains network delay mean value; Said preset number can be 100,200 or other numbers, and the user can set up on their own.
If the network delay of the RTP of said preset number bag take place fluctuation and overall trend for increase or network delay mean value greater than preset upper limit value, S3043 then: reduce transmission code rate;
If the network delay of the RTP of said preset number bag take place fluctuation and overall trend for reduce or network delay mean value less than preset lower limit, then S3044: the raising transmission code rate.
Wherein, the strategy that reduces transmission code rate can have two kinds: the one, drop to lowly as far as possible, and promptly drop to the minimum value that can satisfy video preview; The 2nd, according to the time-delay weighting, confirm the reduction amplitude of transmission code rate.Improving transmission code rate, can be according to the time-delay weighting, confirms the lifting amplitude of transmission code rate, increases gradually according to the lifting amplitude, follows and falls the principle that rises slowly soon, ensures the unimpeded of network.
The overall variation trend of the network delay of the RTP bag of the preset number of above-mentioned statistics is example with certain the RTP bag A in the RTP bag of preset number, and specific operation process can be following:
Obtain the average delay ave_delay_A of RTP bag A continuous 100 RTP bag before, have the RTP bag of overtime repeating transmission not participate in statistics, so average delay ave_delay_A is the average delay smaller or equal to 100 RTP bags.The delay array that the time-delay of continuous 100 RTP bag before the RTP bag A can be adopted to comprise 100 data item is come record.
Average delay ave_delay_A multiplied each other with the first weight factor F1 and the second weight factor F2 respectively obtain two product Pro1_A=F1 * ave_delay_A and Pro2_A=F2 * ave_delay_A; Wherein, the first weight factor F1 is greater than the second weight factor F2, thus; Pro1_A and Pro2_A will judge that the numerical value interval is divided into three sections: (0; Pro2_A), [Pro2_A, Pro1_A] and (Pro1_A ,+∞).Afterwards, judge the network delay cur_delay_A of RTP bag A belongs to which segment in above-mentioned three intervals.
For other RTP bags in the preset number RTP bag, can analogize processing with reference to top flow process, finally count the overall variation trend of the network delay of the RTP bag of presetting number.
A, if wherein the cur_delay of RTP bag surpasses setting threshold greater than the number of times of Pro1, fluctuation and overall trend take place for increasing in the network delay of then judging the RTP bag of preset number;
B, if the cur_delay of RTP bag surpasses said setting threshold less than the number of times of Pro2, fluctuation and overall trend take place for reducing in the network delay of then judging the RTP bag of preset number;
C, other situation judge that the network delay of the RTP bag of presetting number is more steady.
For c, further comprise the steps:
C1 upgrades delay data and computing network time-delay mean value;
Upgrade the delay data, the said RTP bag that is about among the step S3042 adds the delay array that has 100 the RTP bags in its front, and top delay data is shifted out the delay array.Said network delay mean value is to draw according to the delay data computation after upgrading.
C2 is if network delay mean value is greater than preset upper limit value; Then reduce transmission code rate;
C3 is if network delay mean value less than preset lower limit, then improves transmission code rate;
C4 is not if network delay mean value smaller or equal to preset upper limit value and more than or equal to preset lower limit, is adjusted code check.
Detect the network bandwidth in real time through DVR, the adjustment transmission code rate can the reasonable use network bandwidth, guarantees the video/audio quality of monitor client preview video.
The method of transmitting video data of the low bandwidth of present embodiment; On the basis of adopting the UDP transmitting video data; Can receive that through application layer the RTCP bag that carries RTP bag sign receives said RTP bag to monitor client and whether successfully confirms; If the overtime confirmation of not receiving is then retransmitted said RTP bag, improved reliability of video data transmission in low-bandwidth network.And the RTCP bag that carries RTP bag sign is very little to the expense of low-bandwidth network.Through the real-time detection network bandwidth, the adjustment transmission code rate can the reasonable use network bandwidth, guarantees the video/audio quality of monitor client preview video.
Embodiment three
Present embodiment provides a kind of DVR of low bandwidth, and is as shown in Figure 5, and said DVR comprises cache module 10 and sending module 20.
Sending module 20 is used for sending said RTP bag through UDP to monitor client; And said RTP bag send that the back surpasses that Preset Time do not receive that monitor client returns carry the RTCP bag of said RTP bag sign the time, retransmit the said RTP bag of cache module buffer memory.
Said DVR can also comprise removing module 30, is used in the Preset Time after said RTP bag sends, receive that monitor client returns carry the RTCP bag of said RTP bag sign the time, the said RTP bag sign of deletion buffer memory and corresponding RTP bag thereof.
Preferably, said DVR also comprises code check adjusting module 40, is used for the transmission code rate according to network bandwidth adjustment video data.
Said code check adjusting module 40 specifically comprises adjustment unit, is used for when packet loss occurring, reduces transmission code rate.
Further, said DVR can also comprise:
Then said adjustment unit can also be used for:
When the network delay of the RTP of said preset number bag fluctuation and overall trend takes place for increasing or network delay mean value during greater than preset upper limit value, reduce transmission code rate;
When the network delay of the RTP of said preset number bag fluctuation and overall trend takes place for reducing or network delay mean value during less than preset lower limit the raising transmission code rate.
The DVR of present embodiment; On the basis of adopting the UDP transmitting video data; Can receive that through application layer the RTCP bag that carries RTP bag sign receives said RTP bag to monitor client and whether successfully confirms; If the overtime confirmation of not receiving is then retransmitted said RTP bag, improved reliability of video data transmission in low-bandwidth network.And the RTCP bag that carries RTP bag sign is very little to the expense of low-bandwidth network.Through the real-time detection network bandwidth, the adjustment transmission code rate can the reasonable use network bandwidth, guarantees the video/audio quality of monitor client preview video.
Because the embodiment of DVR is more with the similar content of method embodiment, that therefore describes is simpler, and relevant part sees also method embodiment part.
Need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.And; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements; But also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (5)
1. the method for transmitting video data of a low bandwidth is characterized in that, said method comprises:
Send the realtime transmission protocol RTP bag through UDP to monitor client, and the sign of said RTP bag of buffer memory and said RTP bag, be packaged with video data in the said RTP bag;
If after said RTP bag sends, surpass the RTCP Real-time Transport Control Protocol RTCP bag that carries said RTP bag sign that Preset Time does not receive that monitor client returns, then retransmit the said RTP bag of buffer memory;
Said method also comprises: the transmission code rate according to network bandwidth adjustment video data specifically comprises:
When packet loss occurring, reduce transmission code rate; Said packet loss refers to: the RTP of buffer memory bag reaches at full capacity on the server; When the RTP of follow-up transmission bag also will be cached in the server; Even the RTP of front bag does not also receive the RTCP bag of affirmation and deletes; But because spatial cache is full, server can be lost the RTP bag that comes the front, and the RTP bag of back is put into spatial cache;
When packet loss not occurring, the overall variation trend of the network delay of the RTP bag of the preset number of statistics, and obtain network delay mean value;
If the network delay of the RTP of said preset number bag take place fluctuation and overall trend for increase or network delay mean value greater than preset upper limit value, then reduce transmission code rate;
If the network delay of the RTP of said preset number bag take place fluctuation and overall trend for reduce or network delay mean value less than preset lower limit, then improve transmission code rate.
2. the method for claim 1 is characterized in that, also comprises:
If in the Preset Time after said RTP bag sends, receive the RTCP bag that carries said RTP bag sign that monitor client returns, then delete the said RTP bag sign of buffer memory and corresponding RTP bag thereof.
3. according to claim 1 or claim 2 method is characterized in that, said RTCP bag is special applications function APP bag.
4. the DVR of a low bandwidth is characterized in that, comprising:
Cache module is used for the realtime transmission protocol RTP bag of buffer memory transmission and the sign that said RTP wraps, and is packaged with video data in the said RTP bag;
Sending module; Be used for sending said RTP bag to monitor client through UDP; And said RTP bag send that the back surpasses that Preset Time do not receive that monitor client returns carry the RTCP Real-time Transport Control Protocol RTCP bag of said RTP bag sign the time, retransmit the said RTP bag of cache module buffer memory;
Statistical module is used for when packet loss not occurring, the overall variation trend of the network delay of the RTP bag of the preset number of statistics; Said packet loss refers to: the RTP of buffer memory bag reaches at full capacity on the server; When the RTP of follow-up transmission bag also will be cached in the server; Even the RTP of front bag does not also receive the RTCP bag of affirmation and deletes; But because spatial cache is full, server can be lost the RTP bag that comes the front, and the RTP bag of back is put into spatial cache;
Acquisition module is used to obtain network delay mean value;
The code check adjusting module is used for the transmission code rate according to network bandwidth adjustment video data;
Said code check adjusting module comprises adjustment unit, is used for when packet loss occurring, reduces transmission code rate; When packet loss not occurring, if the network delay of the RTP of said preset number bag take place fluctuation and overall trend for increase or network delay mean value greater than preset upper limit value, reduce transmission code rate; If the network delay of the RTP of said preset number bag take place fluctuation and overall trend for reduce or network delay mean value less than preset lower limit, the raising transmission code rate.
5. DVR as claimed in claim 4; It is characterized in that; Also comprise removing module; Be used in the Preset Time after said RTP bag sends, receive that monitor client returns carry the RTCP bag of said RTP bag sign the time, the said RTP bag sign of deletion buffer memory and corresponding RTP bag thereof.
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| CN102244775B (en) * | 2011-06-23 | 2014-11-19 | 杭州海康威视数字技术股份有限公司 | Digital video recorder (DVR) and network bandwidth control method thereof |
| CN102427525B (en) * | 2011-07-29 | 2013-12-25 | 上海交通大学 | Joint multimedia source-channel coding and transmission method based on code rate switchover |
| TWI451722B (en) * | 2011-11-07 | 2014-09-01 | Quanta Comp Inc | Bit rate control apparatus and method thereof |
| CN102882920B (en) * | 2012-06-25 | 2016-01-20 | 深圳市同洲电子股份有限公司 | The control method of digital television system, system and relevant device |
| KR101640851B1 (en) * | 2012-09-27 | 2016-07-19 | 닛본 덴끼 가부시끼가이샤 | Method for transmitting image information and packet communication system |
| KR101640852B1 (en) * | 2012-09-27 | 2016-07-19 | 닛본 덴끼 가부시끼가이샤 | Method for transmitting audio information and packet communication system |
| CN103036904B (en) * | 2012-12-27 | 2015-10-21 | 东方通信股份有限公司 | A kind of udp protocol that uses in a communication network carries out the method for reliable data transmission |
| CN107979449B (en) * | 2016-10-25 | 2020-11-20 | 杭州海康威视数字技术股份有限公司 | Data transmission method and device |
| WO2019080022A1 (en) * | 2017-10-26 | 2019-05-02 | 天彩电子（深圳）有限公司 | Method and device for network video stream transmission congestion control |
| CN108415855A (en) * | 2018-03-06 | 2018-08-17 | 珠海全志科技股份有限公司 | It makes video recording file memory method and device, computer installation and storage medium |
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