CN101394555A - High error tolerant low time delay video transmission method and device suitable for deep space communication - Google Patents

High error tolerant low time delay video transmission method and device suitable for deep space communication Download PDF

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CN101394555A
CN101394555A CNA2008102250491A CN200810225049A CN101394555A CN 101394555 A CN101394555 A CN 101394555A CN A2008102250491 A CNA2008102250491 A CN A2008102250491A CN 200810225049 A CN200810225049 A CN 200810225049A CN 101394555 A CN101394555 A CN 101394555A
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data
transmission
enhancement
video
code stream
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CN101394555B (en
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戴琼海
陆峰
肖红江
尔桂花
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Tsinghua University
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Abstract

The invention provides a video transmission method and a device with high fault tolerance and low latency which is applied to deep space communication, wherein, the method comprises a video coding step, a base-layer data transmission step, an enhancement-layer data transmission step and a video decoding step. In the video coding step, acquired video data is processed through scalable video coding, and a scalable video coding code stream includes a base-layer code stream and at least an enhancement-layer code stream; in the base-layer data transmission step, the base-layer code stream in the scalable video coding code stream is extracted and transmitted by using an automatic retransmission request method, and the network packet loss rate is calculated when the transmission of the base-layer code stream is finished; in the enhancement-layer data transmission step, the enhancement-layer code stream is extracted, the obtained parameter is calculated for channel coding and transmission according to the packet loss rate by combining the channel coding technology for Athlon code, and the received enhancement-layer code stream is processed through channel decoding; and in the video decoding step, the received base-layer code stream is processed through video decoding, and the enhancement-layer code stream which is processed through channel decoding is processed through video decoding by combining the received base-layer code stream.

Description

Be applicable to the video transmission method and the device of the high fault-tolerant low delay of deep space communication
Technical field
The present invention relates to encoding digital video signals and transmission field, particularly a kind of video transmission method and device that is applicable to the high fault-tolerant low delay characteristic of having of deep space communication.
Background technology
Survey of deep space is meant the activity that the outer space beyond the moon and the moon is surveyed, and promptly breaks away from earth gravitational field, enters the detection in solar system space and cosmic space.So-called deep space generally be meant apart from the hundreds thousand of even hundreds of hundred million kilometer space in addition of the earth, and the communication distance of mankind's artificial earth satellite in the past is generally hundreds of to tens thousand of kilometers.Therefore, though with the moon of 380,000 kilometers of the distance earth, realize that the problem that video communication ran into just exists very big difference with common satellite communication.So, if will communicate with other planet of the solar system, then demand side is to the above communication distance of tens million of kilometers.
In deep space communication, its network has big time-delay, chain Louis terminal, up-downgoing is asymmetric and signal to noise ratio is extremely low characteristics, belong to a kind of time-delay and allow network (DTN, Delay Tolerant Networks), and traditional reliable transport protocol TCP (Transfer Control Protocol) and improve that agreement is based on the Internet (Internet) and design, and be not suitable for the very big and low-down occasion of signal to noise ratio of time-delay.Therefore, deep space communication can not directly adopt among the Internet the transmission means that extensively adopts.
So, in order to satisfy the demand of deep space communication, (the CCSDS of International Standards Organization of spatial data transmission system, Consultative Committee for Space Data System) having proposed can support space and the agreement (CFDP, CCSDS File Delivery Protocol) of ground network.CFDP is one of main improvement of Transmission Control Protocol, in transmission course to the regulation of automatic repeat requests (ARQ, Auto RepeatRequest).Because the receiving terminal of Transmission Control Protocol can be sent to transmitting terminal as affirmative acknowledgement (ACK) (ACK) with all correct packet informations that receives, this can waste the transmission that is used for a large amount of feedback informations for a long time in the such big time delay network of deep space communication so; And CFDP has improved this method, adopts receiving terminal only to send the mode of representing the Negative Acknowledgement information (NAK) that takes defeat in batches, has significantly reduced the feedback data amount, thereby has saved the stand-by period of feedback transmission.Yet in survey of deep space, often data volume is bigger survey to be worth the highest video information, and the memory capacity of spacecraft and disposal ability are limited, this situation can cause the time-delay of deep space communication big, confirm that efficiency of retransmission is low etc.
Because the origin and the evolution in the solar system and universe (comprising life) can be further explored in survey of deep space, survey of deep space simultaneously helps human active development and utilizes space resources, the expansion living space, help the sustainable development service of human society, therefore, survey of deep space has become the important development direction of new Space Age, and the step of human detection deep space is constantly striding forward, and paces are also more and more faster.As seen, how the video communication at big data quantity develops corresponding deep space communication technology, has become in the survey of deep space problem that must emphasis solves.
In a word; need the urgent technical problem that solves of those skilled in the art to be exactly: how to reduce the time-delay of deep space communication and improve the affirmation efficiency of retransmission, to overcome the low and inflexible defective of data protection mode of bandwidth availability ratio that the video transmission agreement exists in traditional deep space communication.
Summary of the invention
Technical problem to be solved by this invention provides a kind of video transmission method of high fault-tolerant, low delay, with the utilance of the band bandwidth that improves traditional deep space communication channel, and protected data neatly.
In order to address the above problem, the invention discloses a kind of video transmission method that is applicable to the high fault-tolerant low delay of deep space communication, comprise: the video coding step, at transmitting terminal, the video data of being gathered is carried out scalable video, obtain the scalable video code stream of layering, this scalable video code stream comprises basic layer bit stream and at least one enhancement layer bitstream; The importance of described enhancement layer bitstream is lower than described basic layer bit stream; The base layer data transmitting step extracts the basic layer bit stream in the scalable video code stream, and utilizes automatic retransmission request method to transmit described basic layer bit stream; And, computing network packet loss when the basic layer bit stream end of transmission; The enhancement data transmitting step, extract the enhancement layer bitstream in the scalable video code stream, channel coding technology in conjunction with speed dragon sign indicating number carries out chnnel coding and transmission according to the parameter that described packet loss calculates, and at receiving terminal the enhancement layer bitstream that is received is carried out channel-decoding; The video decode step at receiving terminal, is carried out video decode with the basic layer bit stream that is received, and in conjunction with the basic layer bit stream that is received, the enhancement layer bitstream behind the channel-decoding is carried out video decode.
Preferably, when described enhancement layer is multilayer, has the importance difference between level.
Preferably, when an enhancement layer bitstream comprises the video data of different frame, the code stream that belongs to an enhancement layer together of different frame is carried out chnnel coding together.
Preferably, the transmission of described base layer data is realized by following substep:
Search and have or not the base layer data that does not send in each frame video data of current scalable video code stream,, then establish and connect transmission, this base layer data that does not send is sent in order if having; Behind the end of transmission,, check to have or not repeat requests,, then retransmit institute's requested packets, have or not the base layer data that does not send otherwise return to search if having according to the packet of repeat requests information in batches that comprises of receiving terminal feedback;
If the base layer data that does not send is not then waited for certain repeat requests time, and have or not repeat requests in the judgement certain hour interval, if having, the packet of repeat requests is waited for certain repeat requests time afterwards again; If no repeat requests then according to the bag number of the base layer data in this transmission and the network packet loss rate in the number of retransmissions calculating certain hour section, finishes the transmission of this base layer data.
Preferably, the transmission of described enhancement data is realized by following substep:
Search and have or not the enhancement data that does not send in the current scalable video code stream, if have, then reach the importance of working as anterior layer according to the network packet loss rate in this transmission, adopt fast imperial code encoding method to determine the bag number of the coded data packet of current enhancement data, and behind the bag number of the coded data packet that calculates all enhancement layers, send whole coded data packet;
If the not enhancement data that does not send, then enhancement data transmission end.
Accordingly, the present invention also discloses a kind of video frequency transmitter that is applicable to the high fault-tolerant low delay of deep space communication, comprise: video encoding module, the video data that is used for being gathered carries out scalable video, obtain the scalable video code stream of layering, this scalable video code stream comprises basic layer bit stream and at least one enhancement layer bitstream; The importance of described enhancement layer bitstream is lower than described basic layer bit stream; The base layer data transport module is used for extracting the basic layer bit stream of scalable video code stream, and utilizes automatic retransmission request method to transmit described basic layer bit stream; And, computing network packet loss when the basic layer bit stream end of transmission;
The enhancement data transport module, be used for extracting the enhancement layer bitstream of scalable video code stream, channel coding technology in conjunction with speed dragon sign indicating number carries out chnnel coding and transmission according to the parameter that described packet loss calculates, and at receiving terminal the enhancement layer bitstream that is received is carried out channel-decoding; The video decode module, the basic layer bit stream that is used for being received carries out video decode, and in conjunction with described basic layer bit stream, the enhancement layer bitstream behind the channel-decoding is carried out video decode.
Preferably, when described enhancement layer is multilayer, has the importance difference between level.
Preferably, when an enhancement layer bitstream comprises the video data of different frame, the code stream that belongs to an enhancement layer together of different frame is carried out chnnel coding together.
Preferably, described base layer data transport module further comprises:
The first transmission submodule when each frame that is used for current scalable video code stream has the base layer data that does not send, establishes and connects transmission, and the described base layer data that does not send is sent in order; Behind the first transmission submodule end of transmission, according to the packet of repeat requests information in batches that comprises of receiving terminal feedback, check to have or not repeat requests, if having, then retransmit institute's requested packets, have or not the base layer data that does not send otherwise return to search;
The second transmission submodule is used for then waiting for certain repeat requests time when the base layer data that do not send, and judges in certain hour at interval and have or not repeat requests, if having, the packet of repeat requests is waited for certain repeat requests time afterwards again; If no repeat requests then according to the bag number of the base layer data in this transmission and the network packet loss rate in the number of retransmissions calculating certain hour section, finishes the transmission of this base layer data.
Preferably, described enhancement layer bitstream transport module further comprises:
Judge submodule, be used for searching current scalable video code stream and have or not the enhancement data that does not send, if having, notification transmission submodule then; If do not have, then this enhancement data sends and finishes;
The transmission submodule, be used for reaching the importance of working as anterior layer according to the network packet loss rate of this transmission, adopt fast imperial code encoding method to determine the bag number of the coded data packet of current enhancement data, and behind the bag number of the coded data packet that calculates all enhancement layers, send whole coded data packet.
Compared with prior art, the present invention has the following advantages:
The present invention is based on scalable video (SVC; Scalable Video Coding) hierarchical nature of technology; take all factors into consideration the difference of each layer of video data importance; obtain the video coding code stream of different importance degrees by the SVC video coding technique, realized the non-flat error protection that waits for different importance data.
At first, for the host-host protocol of importance degree base layer data employing the highest, that data volume is very little based on traditional ARQ, guarantee the correct transmission and the prioritised transmission of most important data, but and make receiving terminal can in the shortest time, obtain the low quality playback version of video; Moreover; for the lower enhancement data of importance degree; according to the packet loss that obtains in the different and basic layer transmission of the importance degree of each enhancement layer; take speed dragon sign indicating number (Raptor Codes) channel coding method of different parameters; realization waits error protection for the non-flat of different importance data, and has removed the huge transmission delay that uses the ARQ method to bring from.This shows that the present invention has realized the error protection to the video data that is transmitted, thereby reduced time-delay by in conjunction with the characteristics of Raptor Codes chnnel coding and the self-adapted tolerance ability of SVC itself.
Video coding that the present invention taked and transmission policy are at the big characteristic of deep space transmission middle distance time-delay far away, substitute the ARQ method that causes huge time-delay in a large amount of non-significant data transmission by information source and channel coding method with fault-tolerant ability, balance the contradiction of transmission accuracy and transmission speed, maximized the effect of deep space video transmission.
Description of drawings
Fig. 1 is the basic layer bit stream of one-frame video data of the present invention and the schematic diagram of each enhancement layer bitstream;
Fig. 2 is the overall procedure block diagram of the preferred embodiment one of video transmission method of the present invention;
Fig. 3 A is the method step flow chart that is used for the base layer data transmission of the preferred embodiment two of video transmission method of the present invention;
Fig. 3 B is the method step flow chart that is used for the enhancement data transmission of the preferred embodiment two of video transmission method of the present invention;
Fig. 4 is the structural representation of the preferred embodiment one of video frequency transmitter of the present invention;
Fig. 5 is the structural representation of the preferred embodiment two of video frequency transmitter of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
At present, in order to satisfy the demand of deep space communication, many transmission methods constantly are modified, but existing transmission method can't be distinguished the importance degree of the data of diverse location in the code stream, for video information, the importance degree of the data of diverse location is different in the code stream, should guarantee accurate transmission for the code stream that importance degree is high, and the code stream low for importance degree then can really transmit in unnecessary refinement.
In view of this, the invention provides a kind of video coding and transmission policy, mainly be based on the hierarchical nature of scalable video, the video data of different importance degrees is carried out scalable video, obtain basic layer bit stream and at least one enhancement layer bitstream.For importance degree basic layer bit stream the highest, that data volume is very little, adopt host-host protocol based on traditional ARQ, guarantee the correct transmission and the prioritised transmission of most important data, but and make receiving terminal can in the shortest time, obtain the low quality playback version of video; Be lower than the enhancement layer bitstream of basic layer bit stream for importance degree, according to the packet loss that obtains in the different and basic layer transmission of the importance degree of each enhancement layer, take the Raptor Codes coding method of different parameters that enhancement layer bitstream is carried out chnnel coding and transmission, base layer data that combination is received when video decode and the self-adapted tolerance ability of SVC itself, enhancement layer bitstream is carried out video decode, when reducing transmission delay, obtained high-quality video playback version.
Described SVC technology is the form of video signal coding component layer, and a code stream to basic layer transmits and decodes when bandwidth is not enough, but at this moment the video quality of decoding is not high; When bandwidth becomes big gradually, can transmit the decoding quality that improves video with the code stream of decoding enhancement layer.
Described Raptor Codes channel coding method then belongs to a kind of of fountain sign indicating number (Fountain Codes), comprise a two-forty precoding and LT sign indicating number (LT Codes, the no-rate codes of Luby design), precoding technique is the core technology that Raptor Codes adopts, and this precoding technique can overcome the unfixed shortcoming of LT Codes decoding cost.The characteristics of described Raptor Codes channel coding method are that coding side obtains any a plurality of coded data packet and transmission with N initial data packet encoder, and receiving terminal just can recover initial data after receiving wherein any individual packet of N ', and N ' only needs to be slightly larger than N, can realize decoding success by them, so just expand the flexibility ratio and the ability of forward error correction greatly.Described Raptor Codes channel coding method has the decoding rate advantages of higher, is fit to solve the safety problem of Network Transmission.
With reference to Fig. 1, show the basic layer bit stream of one-frame video data of the method for the invention and the schematic diagram of each enhancement layer bitstream.
The preferred embodiments of the present invention are carried out scalable video with the video data of being gathered, and up-to-date scalable video standard based on is H.264/AVC adopted in coding method.Hierarchical nature based on the SVC video coding, can from the code stream of a coding, extract the sublayer code stream of different parameters, the video data of different importance degrees is encoded as the scalable video code stream of layering, a wherein most important layer bit stream is called basic layer bit stream, the code stream of all the other levels is called enhancement layer bitstream, this enhancement layer bitstream can realize being with error-decoded, and the related enhancement layer bitstream of the preferred embodiments of the present invention is at least one.
As shown in Figure 1, one-frame video data is carried out obtaining behind the SVC video coding: basic layer bit stream B, and two enhancement layer bitstream E 1And E 2, E wherein 1Importance greater than E 2Equally, under the multiframe data conditions, as: when spacecraft has once been gathered two frame video datas, obtain the basic layer bit stream B of first frame respectively through the SVC video coding 1, enhancement layer bitstream E 11With enhancement layer bitstream E 12, and the basic layer bit stream B of second frame 2, enhancement layer bitstream E 21With enhancement layer bitstream E 22
With reference to Fig. 2, show the overall procedure block diagram of the preferred embodiment one of video transmission method of the present invention.The present invention is by combining SVC technology and Raptor Codes channel coding method; adopt the Raptor Codes chnnel coding of different parameters for different video enhancement layer bitstreams; thereby realize the non-flat error protection of Denging; thoroughly removed from simultaneously and used the ARQ agreement to transmit, greatly saved the transmission time of feedback information described enhancement layer.The process step of this preferred embodiment one, as shown in Figure 2:
Step S201, video coding: at transmitting terminal, the video data of being gathered is carried out the SVC video coding, obtain the scalable video code stream of layering, this scalable video code stream comprises: basic layer bit stream and at least one enhancement layer bitstream; The importance of described enhancement layer bitstream is lower than described basic layer bit stream;
Step S202, transmission base layer data:, extract the basic layer bit stream in the scalable video code stream that obtains of encoding, and utilize the described basic layer bit stream of ARQ protocol transmission at transmitting terminal; And, computing network packet loss when the basic layer bit stream end of transmission;
The basic layer bit stream B of each frame that is input as the scalable video code stream among the step S201 of step S202 is output as receiving terminal basic layer bit stream B ' that receive and decoded each frame and the current transmission packet loss that feeds back to transmitting terminal.This preferred embodiment one, only the basic layer bit stream to video data utilizes traditional ARQ method to transmit, and statistics obtains current transmission packet loss.
Step S203, transmission enhancement data: at transmitting terminal, extract the enhancement layer bitstream in the scalable video code stream, channel coding technology in conjunction with speed dragon sign indicating number, carry out chnnel coding and transmission according to the parameter that described packet loss calculates, and the enhancement layer bitstream that is received is carried out channel-decoding at receiving terminal;
Step S203 is input as the enhancement layer bitstream E that is obtained by the SVC video coding among the step S201 i(i=1,2,3...... are the number of plies) and current network packet loss are output as the reception of receiving terminal and the enhancement layer layer bit stream E of each frame behind the channel-decoding i' (i=1,2,3...... are the number of plies), and the number of plies of enhancement layer is low more, and the importance of this enhancement layer is big more.Step S203 only transmits for the enhancement layer bitstream of video code flow; and the same enhancement layer bitstream of different frame is encoded together; and adopted Raptor Codes channel coding methods under the different transmission of the self adaptation packet loss in the transmission, and the fault-tolerant ability that has fully utilized Raptor Codes and SVC enhancement layer is transmitted data protection and error correction.
Wherein, step S203 is finished, and promptly after the enhancement data end of transmission, returns step S202.
Step S204, video decode: at receiving terminal, the basic layer bit stream that is received is carried out video decode, and carry out video decode in conjunction with the basic layer bit stream that the received enhancement layer bitstream after to channel-decoding.
Usually, the message that the data message that the ARQ agreement is made mistakes by the re-transmission of receiving terminal request transmitting terminal recovers to make mistakes is to be used for one of method of mistake that processing channel is brought in the communication.In order further to improve the utilance of channel, when the status report indication message that receives receiving terminal when transmitting terminal was made mistakes, the ARQ agreement can only send the message that transmission makes a mistake by the regulation transmitting terminal.The preferred embodiments of the present invention have been done some improvement on this basis, promptly in the certain hour section repeat requests are fed back to transmitting terminal in bulk with a packet.
Below in conjunction with Fig. 3 A and Fig. 3 B, introduce the preferred embodiment two of video transmission method of the present invention.
This preferred embodiment two has further provided the concrete steps of video Data Transmission in the deep space communication than above preferred embodiment one, mainly is divided into base layer data transmission and enhancement data and transmits two parts and introduce.With reference to Fig. 3 A and Fig. 3 B, show the method step flow chart that is used for base layer data transmission and enhancement data transmission of the preferred embodiment two of video transmission method of the present invention respectively.
At transmitting terminal, extract the basic layer bit stream of each frame video data in the scalable video code stream that obtains of encoding, and utilize the basic layer bit stream of ARQ protocol transmission.As shown in Figure 3A, the transmission of described base layer data may further comprise the steps:
Step S3A01, base layer data sends beginning;
Step S3A02 searches and has or not the base layer data that does not send in each frame video data of current scalable video code stream, if having, and then execution in step S3A03, execution in step S3A04 simultaneously;
Step S3A03 establishes to connect and transmits, and the base layer data that does not send that finds is sent in order;
Step S3A04 carries out at receiving terminal, receives base layer data, and the feedback repeat requests, specifically may further comprise the steps:
Step S3A04a receives base layer data;
Step S3A04b, the sequence number n of the sequence number n ' of the packet that record is received at last and all packets that do not receive as yet before this i, and with decoded basic layer bit stream output;
Step S3A04c, receiving terminal at regular intervals the section T 0The time to n iJudge, according to n ' and n iMagnitude relationship, judge certain hour section T 0In have or not the packet of losing, if execution in step S3A04d is arranged; Otherwise return step S3A04a;
Step S3A04d sends repeat requests, with all n '-n iPacket sequence number n greater than 0 iFeed back to transmitting terminal in bulk by a packet;
The characteristics of the re-transmission policy that this preferred embodiment two is adopted are, with all the packet sequence number n that need retransmit in the certain hour section iFeed back to transmitting terminal in bulk with a packet.The packet that will include repeat requests information so in bulk feeds back to transmitting terminal, can effectively improve the utilance of network.
Step S3A05, transmitting terminal has judged whether repeat requests, if then execution in step S3A06 is arranged, otherwise returns step S3A02;
Step S3A06, transmitting terminal is according to the packet sequence number n of the request retransmission of receiving terminal feedback i, retransmit this packet sequence number n iIndicated packet;
If do not find the base layer data that does not send, then execution in step S3A07;
Step S3A07 waits for certain repeat requests time T 1, if T 1Repeat requests was arranged in the time interval, and then the packet of repeat requests is waited for certain repeat requests time T afterwards again 1If no repeat requests, then execution in step S3A08;
Wherein, judge the certain hour section T that has or not the packet of losing 0Less than the repeat requests time T 1
Step S3A08, according to the bag number and the number of retransmissions of coded data packet of the base layer data in this transmission, computing network packet loss f also feeds back to transmitting terminal with this network packet loss rate f, afterwards execution in step S3A09;
Described network packet loss rate f can be calculated by following formula:
f＝R/(N+R)
Wherein, N is the bag number of the coded data packet of base layer data in this transmission, and R is a number of retransmissions.
Step S3A09, the end of transmission of this base layer data forwards the transmission of this enhancement data to.
When after base layer data transmission is finished, receiving terminal carries out video decode by the SVC decoder to the basic layer bit stream that is received, but obtains the playback version of gross of this two frames video of this transmission.
With reference to Fig. 3 B, show the method flow diagram that is used for the enhancement data transmission of the preferred embodiment two of video transmission method of the present invention.Briefly say, the transmission course of enhancement data is as follows: extract each the frame enhancement layer bitstream in the scalable video code stream, channel coding technology in conjunction with speed dragon sign indicating number, carry out chnnel coding and transmission according to the parameter that described packet loss calculates, and the enhancement layer bitstream that is received is carried out channel-decoding at receiving terminal;
The concrete transmitting step of the enhancement data of this preferred embodiment two shown in Fig. 3 B, comprising:
Step S3B01, enhancement data transmission beginning;
Step S3B02 searches and has or not the enhancement data that sends in the current scalable video code stream, if having, and execution in step S3B03 then;
Step S3B03 reaches the importance of working as anterior layer according to network packet loss rate, calculates the bag number of the coded data packet of current enhancement data, and according to Raptor Codes channel coding method current enhancement data is encoded;
Wherein, the data of the same enhancement layer of described two frames are encoded together.Suppose that the current video code stream has n enhancement layer bitstream E 1... E n, then for each enhancement layer bitstream E iAll N iThe packet of individual frame carries out Raptor Codes coding together, and precoding node layer number is N i* 1.05, round the back by N with advancing a method IzExpression gained result, and the quantity N of final output encoder bag i' satisfy following formula:.
N i ′ = 1.15 × N iz × ( 1 + f × i + 1 - 2 n 1 - n )
In the formula, i is the number of plies of current enhancement layer, and n is the code stream number of enhancement layer, and i, n be positive integer, and f is a network packet loss rate.Gained result---the quantity N of final output encoder bag i' round with advancing a method equally.
Step S3B04 after calculating the coded data packet of each enhancement layer, sends whole described coded data packet, and at receiving terminal the enhancement layer bitstream that is received is carried out channel-decoding;
As if the enhancement data that does not send, then execution in step S3B05;
Step S3B05, enhancement data sends and finishes, and forwards step S3A01 to, the transmission of beginning video data next time.
More preferred, the preferred embodiments of the present invention three are described is transmission of video signals process when the spacecraft that carries out survey of deep space collects two frame video datas.
Similar with the process of preferred embodiment two, at first these two frame data of being gathered are carried out video coding through SVC, obtain the basic layer bit stream B of first frame respectively 1, enhancement layer bitstream E 11With enhancement layer bitstream E 12, and the basic layer bit stream B of second frame 2, enhancement layer bitstream E 21With enhancement layer bitstream E 22
Then, transmitting terminal is searched when in each frame of present encoding code stream whether the base layer data that does not send being arranged, and found that basic layer bit stream B 1And B 2Waiting to be transmittedly, then establishing and connect transmission, base layer data B 1Send, then continue B if there is not repeat requests this moment 2Send.
If receiving terminal has received B 2But B 1Lose, then write down sequence number n '=2 of current last packet of receiving, before the sequence number n of unreceived all packets still 1=1; Receiving terminal is at T 0During=100s, to n 1Judge and learn: n '-n 1=2-1 is greater than 0, so with the sequence number n of lost package 1=1 sends to transmitting terminal.
If there is not repeat requests, and the base layer data that does not send, then wait for T 1The repeat requests time of=1000s.As a result, transmitting terminal is at T 1Receive the request of the retransmission data packet may 1 of receiving terminal in the time period of=1000s, then with B 1Retransfer, and wait for T again 1The time of=1000s.
Transmitting terminal is with B 1Retransfer, and receiving terminal successfully receives B 1After, no longer send repeat requests, then receiving terminal output B 1'=B 1, B 2'=B 2Transmitting terminal is at T 1Still do not receive the re-transmission requirement of receiving terminal behind the=1000s, then count N=2 and number of retransmissions R=1 by the bag of the coded data packet of base layer data in this transmission, obtain current network packet loss f=R/ (N+R)=1/ (1+3)=0.25, the end of transmission of this base layer data forwards the transmission of this enhancement data to.
After finishing in the base layer data transmission, receiving terminal has obtained basic layer video encoding code stream B 1' and B 2', pass through the SVC decoder this moment to B 1' and B 2' decode, but the playback version of gross of this two frames video of this transmission can be obtained.
For the transmission of described enhancement layer bitstream, adopted the RaptorCodes channel coding methods under the different transmission of the self adaptation packet loss f, the enhancement layer bitstream of each frame video data in the scalable video code stream is carried out chnnel coding and transmission.Wherein, the first frame video data is encoded as packet E 11And E 12, the video data of second frame is encoded as packet E 21And E 22The concrete transmission course of described enhancement layer bitstream is as follows:
When whether the enhancement data that does not send is arranged in each frame of searching current SVC video coding code stream, find to exist packet E 11, E 12And E 21, E 22Wait to be transmitted.At this moment, current SVC video coding code stream has n=2 enhancement layer bitstream E 1And E 2, at this moment, enhancement layer bitstream E 1Comprise two packet: E 11And E 21, enhancement layer bitstream E 2Also comprise two packet: E 12And E 22
At first for enhancement layer bitstream E 1(i=1) all N 1=2 packet E 11And E 21Carry out the RaptorCodes coding together, precoding node layer number is N 1* 1.05=2 * 1.05=2.1 rounds the back by N with advancing a method 1ZExpression gained result, i.e. N 1Z=3, and the quantity N of final output encoder bag 1' be:
N 1 ′ = 1.15 × N 1 z × ( 1 + f × i + 1 - 2 n 1 - n )
= 1.15 × 3 × ( 1 + 0.25 × 1 + 1 - 2 × 2 1 - 2 ) = 5.175
With the result of following formula gained with after advancing a method and rounding, N 1' be 6, then use Raptor Codes with enhancement layer bitstream E 12 raw data packets E 11And E 21Be encoded into 6 coded data packet.
For enhancement layer bitstream E 2(i=2) all N 2=2 packet E 12And E 22Carry out the RaptorCodes coding together, precoding node layer number is N 2* 1.05=2 * 1.05=2.1 rounds the back by N with advancing a method 2ZExpression gained result, i.e. N 2Z=3, and the quantity N of final output encoder bag 2' be:
N 2 ′ = 1.15 × N 2 z × ( 1 + f × i + 1 - 2 n 1 - n )
= 1.15 × 3 × ( 1 + 0.25 × 2 + 1 - 2 × 2 1 - 2 ) = 4 . 3125
With the result of following formula gained with after advancing a method and rounding, N 2' be 5, then use Raptor Codes with enhancement layer bitstream E 22 raw data packets E 12And E 22Be encoded into 5 coded data packet.
After all 2 enhancement layer bitstream end-of-encodes, transmitting terminal all sends all 6+5=11 coded data packet, after receiving terminal receives all or part of bag in these 11 bags, utilize Raptor Codes decoder that the coded data packet that is received is carried out channel-decoding, obtain E 11', E 12', E 21' and E 22' and with its output.It is emphasized that the dateout bag E of institute 11', E 12', E 21' and E 22' the E that not necessarily sends with transmitting terminal 11, E 12, E 21And E 22Identical.
Base layer data B before receiving terminal passes through the combination of SVC decoder 1' and B 2', to enhancement layer bitstream E 11', E 12', E 21' and E 22' decode, though E 11', E 12', E 21' and E 22' in may have transmission error, but because the self-adapted tolerance ability of SVC, so on the basis of base layer data, still can decode, but obtain the broadcast decoder picture of the quality version of this two frames video.
Need to prove that the situation below each preferred embodiment of video transmission method of the present invention exists when a video Data Transmission does not finish, can begin the transmission of another time in other transmission channels, they are independent of each other.For example, when the enhancement data of once transmission does not send when finishing, can begin to send base layer data in another transmission channel.But,, after the base layer data end of transmission, could begin the transmission of this enhancement data with in once transmitting.
It is emphasized that, for aforesaid each method embodiment, for simple description, so it all is expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the specification all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
Corresponding to video transmission method of the present invention,, introduce the preferred embodiment one of the video frequency transmitter of a high fault-tolerant low delay that is applicable to deep space communication of the present invention below in conjunction with Fig. 4.
With reference to Fig. 4, show the structural representation of the preferred embodiment one of video frequency transmitter of the present invention.Described video frequency transmitter mainly comprises:
Video encoding module 401, the video data that is used for being gathered carries out scalable video, obtains the scalable video code stream of layering, and this scalable video code stream comprises: basic layer bit stream and at least one enhancement layer bitstream; The importance of described enhancement layer bitstream is lower than described basic layer bit stream;
Wherein, when described enhancement layer is multilayer, has the importance difference between level.
Base layer data transport module 402 is used for extracting the basic layer bit stream of scalable video code stream, and utilizes automatic retransmission request method to transmit described basic layer bit stream; And, when the basic layer bit stream end of transmission, utilize the data retransmission of receiving terminal feedback to calculate network packet loss rate in the certain hour section;
Enhancement data transport module 403, be used for extracting the enhancement layer bitstream of scalable video code stream, channel coding technology in conjunction with speed dragon sign indicating number carries out chnnel coding and transmission according to the parameter that described packet loss calculates, and at receiving terminal the enhancement layer bitstream that is received is carried out channel-decoding;
Wherein, when an enhancement layer bitstream comprises the video data of different frame, the code stream that belongs to an enhancement layer together of different frame is carried out chnnel coding together.
Video decode module 404, the basic layer bit stream that is used for being received carries out video decode, and in conjunction with described basic layer bit stream, the enhancement layer bitstream behind the channel-decoding is carried out video decode.
More preferred, below in conjunction with Fig. 5, introduce the preferred embodiment two of the video frequency transmitter of the high fault-tolerant low delay that is applicable to deep space communication of the present invention.On the basis of included video encoding module, base layer data transport module, enhancement data transport module and video decode module of device preferred embodiment of the present invention, this preferred embodiment two has further been described each functional module.As shown in Figure 5, show the structural representation of the preferred embodiment two of video frequency transmitter of the present invention.
Described video frequency transmitter mainly comprises: video encoding module 501, base layer data transport module 502, enhancement data transport module 503 and video decode module 504;
Wherein, described base layer data transport module 502 further comprises:
The first transmission submodule 5021 when each frame that is used for current scalable video code stream has the base layer data that does not send, establishes and connects transmission, and the described base layer data that does not send is sent in order; Behind the first transmission submodule end of transmission, check according to the receiving terminal feedback data to have or not repeat requests, if having, then retransmit institute's requested packets, have or not the base layer data that does not send otherwise return to search;
The second transmission submodule 5022 is used for then waiting for certain repeat requests time when the base layer data that do not send, and have or not repeat requests in the judgement certain hour interval, if have, the packet of repeat requests continues to wait for certain repeat requests time afterwards; If no repeat requests then according to the bag number and the number of retransmissions computing network packet loss of the base layer data in this transmission, finishes the transmission of this base layer data;
Described enhancement layer bitstream transport module 503 further comprises:
Judge submodule 5031, be used for searching current scalable video code stream and have or not the enhancement data that does not send, if having, notification transmission submodule then; If do not have, then this enhancement data sends and finishes;
Transmission submodule 5032, be used for reaching the importance of working as anterior layer according to the network packet loss rate of this transmission, adopt fast imperial code encoding method to determine the bag number of the coded data packet of current enhancement data, and behind the bag number of the coded data packet that calculates all enhancement layers, send whole coded data packet;
Wherein, when an enhancement layer bitstream comprises the video data of different frame, the code stream that belongs to an enhancement layer together of different frame is carried out chnnel coding together.
For device embodiment, because of its substantially corresponding to method embodiment, so describe fairly simple, relevant part gets final product referring to the part explanation of method embodiment.In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, do not have the part that describes in detail among certain embodiment, can get final product referring to the associated description of other embodiment.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For system embodiment, because it is similar substantially to method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
More than the video transmission method and the device of a kind of high fault-tolerant low delay provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part in specific embodiments and applications all can change, as long as the equivalence of doing according to claims of the present invention changes and modifies, all still belong in the scope that the present invention contains.In sum, this description should not be construed as limitation of the present invention.

Claims (10)

1, a kind of video transmission method that is applicable to the high fault-tolerant low delay of deep space communication is characterized in that, comprising:
The video coding step at transmitting terminal, is carried out scalable video with the video data of being gathered, and obtains the scalable video code stream of layering, and this scalable video code stream comprises basic layer bit stream and at least one enhancement layer bitstream; The importance of described enhancement layer bitstream is lower than described basic layer bit stream;
The base layer data transmitting step extracts the basic layer bit stream in the scalable video code stream, and utilizes automatic retransmission request method to transmit described basic layer bit stream; And, computing network packet loss when the basic layer bit stream end of transmission;
The enhancement data transmitting step, extract the enhancement layer bitstream in the scalable video code stream, channel coding technology in conjunction with speed dragon sign indicating number carries out chnnel coding and transmission according to the parameter that described packet loss calculates, and at receiving terminal the enhancement layer bitstream that is received is carried out channel-decoding;
The video decode step at receiving terminal, is carried out video decode with the basic layer bit stream that is received, and in conjunction with the basic layer bit stream that is received, the enhancement layer bitstream behind the channel-decoding is carried out video decode.
2, the method for claim 1 is characterized in that, when described enhancement layer is multilayer, has the importance difference between level.
3, the method for claim 1 is characterized in that, when an enhancement layer bitstream comprises the video data of different frame, the code stream that belongs to an enhancement layer together of different frame is carried out chnnel coding together.
4, as claim 1 or 2 or 3 described methods, it is characterized in that the transmission of described base layer data is realized by following substep:
Search and have or not the base layer data that does not send in each frame video data of current scalable video code stream,, then establish and connect transmission, this base layer data that does not send is sent in order if having; Behind the end of transmission,, check to have or not repeat requests,, then retransmit institute's requested packets, have or not the base layer data that does not send otherwise return to search if having according to the packet of repeat requests information in batches that comprises of receiving terminal feedback;
If the base layer data that does not send is not then waited for certain repeat requests time, and have or not repeat requests in the judgement certain hour interval, if having, the packet of repeat requests is waited for certain repeat requests time afterwards again; If no repeat requests then according to the bag number of the base layer data in this transmission and the network packet loss rate in the number of retransmissions calculating certain hour section, finishes the transmission of this base layer data.
5, as claim 1 or 2 or 3 described methods, it is characterized in that the transmission of described enhancement data is realized by following substep:
Search and have or not the enhancement data that does not send in the current scalable video code stream, if have, then reach the importance of working as anterior layer according to the network packet loss rate in this transmission, adopt fast imperial code encoding method to determine the bag number of the coded data packet of current enhancement data, and behind the bag number of the coded data packet that calculates all enhancement layers, send whole coded data packet;
If the not enhancement data that does not send, then enhancement data transmission end.
6, a kind of video frequency transmitter that is applicable to the high fault-tolerant low delay of deep space communication is characterized in that, comprising:
Video encoding module, the video data that is used for being gathered carries out scalable video, obtains the scalable video code stream of layering, and this scalable video code stream comprises basic layer bit stream and at least one enhancement layer bitstream; The importance of described enhancement layer bitstream is lower than described basic layer bit stream;
The base layer data transport module is used for extracting the basic layer bit stream of scalable video code stream, and utilizes automatic retransmission request method to transmit described basic layer bit stream; And, computing network packet loss when the basic layer bit stream end of transmission;
The enhancement data transport module, be used for extracting the enhancement layer bitstream of scalable video code stream, channel coding technology in conjunction with speed dragon sign indicating number carries out chnnel coding and transmission according to the parameter that described packet loss calculates, and at receiving terminal the enhancement layer bitstream that is received is carried out channel-decoding;
The video decode module, the basic layer bit stream that is used for being received carries out video decode, and in conjunction with described basic layer bit stream, the enhancement layer bitstream behind the channel-decoding is carried out video decode.
7, device as claimed in claim 6 is characterized in that, when described enhancement layer is multilayer, has the importance difference between level.
8, device as claimed in claim 6 is characterized in that, when an enhancement layer bitstream comprises the video data of different frame, the code stream that belongs to an enhancement layer together of different frame is carried out chnnel coding together.
As claim 6 or 7 or 8 described devices, it is characterized in that 9, described base layer data transport module further comprises:
The first transmission submodule when each frame that is used for current scalable video code stream has the base layer data that does not send, establishes and connects transmission, and the described base layer data that does not send is sent in order; Behind the first transmission submodule end of transmission, according to the packet of repeat requests information in batches that comprises of receiving terminal feedback, check to have or not repeat requests, if having, then retransmit institute's requested packets, have or not the base layer data that does not send otherwise return to search;
The second transmission submodule is used for then waiting for certain repeat requests time when the base layer data that do not send, and judges in certain hour at interval and have or not repeat requests, if having, the packet of repeat requests is waited for certain repeat requests time afterwards again; If no repeat requests then according to the bag number of the base layer data in this transmission and the network packet loss rate in the number of retransmissions calculating certain hour section, finishes the transmission of this base layer data.
As claim 6 or 7 or 8 described devices, it is characterized in that 10, described enhancement layer bitstream transport module further comprises:
Judge submodule, be used for searching current scalable video code stream and have or not the enhancement data that does not send, if having, notification transmission submodule then; If do not have, then this enhancement data sends and finishes;
The transmission submodule, be used for reaching the importance of working as anterior layer according to the network packet loss rate of this transmission, adopt fast imperial code encoding method to determine the bag number of the coded data packet of current enhancement data, and behind the bag number of the coded data packet that calculates all enhancement layers, send whole coded data packet.
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