CN104410927A - Low-redundancy compensation method of video transmission packet loss in erasure channel - Google Patents
Low-redundancy compensation method of video transmission packet loss in erasure channel Download PDFInfo
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- CN104410927A CN104410927A CN201410707432.6A CN201410707432A CN104410927A CN 104410927 A CN104410927 A CN 104410927A CN 201410707432 A CN201410707432 A CN 201410707432A CN 104410927 A CN104410927 A CN 104410927A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64784—Data processing by the network
- H04N21/64792—Controlling the complexity of the content stream, e.g. by dropping packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/637—Control signals issued by the client directed to the server or network components
- H04N21/6375—Control signals issued by the client directed to the server or network components for requesting retransmission, e.g. of data packets lost or corrupted during transmission from server
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- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
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- Computer Security & Cryptography (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
The invention discloses a low-redundancy compensation method of video transmission packet loss in an erasure channel, which is used for error-free transmission of video data. The low-redundancy compensation method comprises the following steps: processing to-be-transmitted data through a transmitting terminal, adding a few redundancy packets into the data to be transmitted so as to form new data to be transmitted, transmitting the new data to a receiving terminal, and if the packet of data received by the receiving terminal is lost, recovering the lost data through the redundancy packets by the receiving terminal. By adopting the low-redundancy compensation method, the lost data can be recovered through the redundancy packets, so that complete data information can be decoded. By adopting the method, the problems that the transmission is delayed or the decoding is failed as data is required to be retransmitted when the packets are lost in the data transmission process are effectively solved, the real-time property and the completeness of data transmission are ensured, and a packet loss retransmission mechanism is not needed.
Description
Technical field
The present invention relates to the Network Video Transmission field in erasure channel, particularly relate to the low redundancy compensation method of transmission of video packet loss in a kind of erasure channel.
Background technology
The feature of erasure channel is the mistake cannot corrected owing to there are some in transfer of data, causes some data or message to be dropped, namely deleted, is reflected to application layer and there is packet loss exactly.In addition, in the channel of some type, such as deep space satellite communication, the time delay of transfer of data is larger, this makes the performance of the reliable data transmission protocol such as TCP based on error retransmission mechanism sharply decline, and cannot be applied to and have in the transmission of video of requirement of real-time.The bandwidth of this kind of channel, due to the restriction of resource, often also has certain limitation, cannot be recovered the data of loss by the error concealment mechanism of High redundancy.
If there is packet loss in transmission of video, so just cannot obtain complete image when decoded video, when broadcasting, occur the phenomenon of mosaic or card.
Therefore, in a kind of erasure channel, the low redundancy compensation method of transmission of video packet loss urgently proposes.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention proposes the low redundancy compensation method of transmission of video packet loss in a kind of erasure channel, the method adds the very low redundancy packet of redundancy in data to be sent, when there is packet loss phenomenon in data transmission procedure, redundancy packet can be utilized the data of loss to be reduced, thus decode complete video data.The method efficiently solves after packet loss phenomenon appears in data transmission procedure, needs to resend data, causes transmission delay or the problem such as unsuccessfully of decoding, ensures real-time and the integrality of transfer of data, do not use packet loss retransmission mechanism.
In order to achieve the above object, technical scheme of the present invention is as follows:
The low redundancy compensation method of transmission of video packet loss in erasure channel, for carrying out error free transport to video data, comprise: transmitting terminal processes data to be sent, redundancy packet is added in data to be sent, form new data to be sent and send to receiving terminal, if the data that receiving terminal receives exist packet loss, receiving terminal is reduced to packet loss data by redundancy packet.
The present invention adds the low redundancy packet of redundancy in data to be sent, effectively can ensure the real-time Transmission of data.Even if packet loss phenomenon appears in data in transmitting procedure, receiving terminal also can be reduced by the data of redundancy packet by lost part, without the need to using packet loss retransmission mechanism.
As preferred scheme, comprise following concrete steps:
(1) transmitting terminal by data upload to be sent to transmission processing end, and to the request of transmission processing end transmission processing;
(2) transmission processing end dissection process request, and according to the process information process data to be sent that process request is carried, in data to be sent, be added to redundancy packet, form new data to be sent;
(3) transmitting terminal sends new data to be sent to receiving terminal;
(4) receiving terminal receives data and by data upload to receiving end for process;
(5) receive end for process to data analysis, judge whether data exist packet loss phenomenon in transmitting procedure, if there is packet loss phenomenon, by redundancy packet, packet loss data are reduced.
Adopt above-mentioned preferred scheme, transmission processing end is utilized to process data to be sent, redundancy packet is added in deal with data to be sent, even if ensure that packet loss phenomenon appears in data in transmitting procedure, receive end for process and also can carry out process reduction to the data after packet loss, thus decode complete data message.
As preferred scheme, the process of data to be sent is comprised the following steps:
(1) data to be sent are divided into the data slot that k isometric, each data slot length is n, if the length of last data slot is discontented with n, then in the end the afterbody of a data slot mends 0;
(2) each data slot is numbered;
(3) each data slot is carried out logical operation by turn, operation result saves as redundancy packet;
(4) redundancy packet is added data to be sent, form new data to be sent.
Adopt above-mentioned preferred scheme, by calculating redundancy packet to the process of data to be sent, the redundancy packet of different data to be sent is different, and redundancy packet and data to be sent are formed new data to be sent, thus sends.
As preferred scheme, in the treatment step (1) of data to be sent, the length cell of data slot is the data cell that calculating function directly processes.
Adopt above-mentioned preferred scheme, be convenient to the processing speed accelerating computer, thus accelerate the transmission and reception speed of video data, the data cell that long measure directly can process for the calculating such as byte, integer function.
As preferred scheme, the treatment step of data to be sent is also comprised:
In each data slot, add packets of information, in packets of information, record the numbering of k value, n value and data slot.
Adopt above-mentioned preferred scheme, each data fragments is except valid data part, also added the packets of information that a data volume is less, recorded the information such as the numbering of k value, n value and this data fragments in packets of information, be convenient to receiving terminal and packet loss data are reduced.
As preferred scheme, also comprise: be numbered redundancy packet the treatment step of data to be sent, the numbering of redundancy packet is different from the numbering of data slot.
Adopt above-mentioned preferred scheme, accept that end for process is easier to be judged data, understand redundancy packet and whether lose, and more convenient in the process of deal with data, be conducive to fast packet loss data being reduced.
As preferred scheme, receiving end for process to the reduction treatment of packet loss data is: judge the number of packet loss data and type, if the number of packet loss data be one and for redundancy packet time, each data slot of data after packet loss and redundancy packet are carried out logical operation by turn, and operation result is the fragment of loss of data.
Adopt above-mentioned preferred scheme, when data exist packet loss in the process transmitted, the fragment of loss can be reduced by logical operation, namely do not need to retransfer can decode complete data message.
As preferred scheme, the process information entrained by process request comprises: k value and/or n value.
Adopt above-mentioned preferred scheme, for different data to be sent, it can be divided into the fragment of identical or different quantity, i.e. k value or n value, can be identical, can be different, and it can do corresponding adjustment according to concrete data to be sent and concrete channel situation.
As preferred scheme, transmission processing end is consistent with the logical operation of reception end for process to data processing to the logical operation of data processing to be sent.
Adopt above-mentioned preferred scheme, when data occur packet loss in the process transmitted, consistent logical operation can ensure that the data of loss are reduced by receiving terminal accurately.
As preferred scheme, logical operation is XOR.
Adopt above-mentioned preferred scheme, XOR is simple calculations mode in logical operation, and it reduces computational complexity while the feasibility ensureing the inventive method.
Accompanying drawing explanation
Fig. 1 is the principle flow chart of the low redundancy compensation method of transmission of video packet loss in erasure channel of the present invention.
Fig. 2 be in erasure channel of the present invention the compensation method of transmission of video packet loss low redundancy to the process chart of data to be sent.
Fig. 3 be in erasure channel of the present invention the low redundancy compensation method of transmission of video packet loss to the reduction flow chart of packet loss data.
Fig. 4 is the schematic diagram of the low redundancy compensation method of transmission of video packet loss in erasure channel of the present invention.
Embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
In order to reach object of the present invention, as Figure 1-4, in the some of them embodiment of the low redundancy compensation method of transmission of video packet loss in erasure channel of the present invention,
The low redundancy compensation method of transmission of video packet loss in erasure channel of the present invention, for carrying out error free transport to video data, the inventive method comprises: transmitting terminal processes data to be sent, redundancy packet is added in data to be sent, form new data to be sent to send to receiving terminal, if the data that receiving terminal receives exist packet loss, receiving terminal is reduced to packet loss data by redundancy packet.
The present invention adds the low redundancy packet of redundancy in data to be sent, effectively can ensure the real-time Transmission of data.Even if packet loss phenomenon appears in data in transmitting procedure, receiving terminal also can be reduced by the data of redundancy packet by lost part, without the need to using packet loss retransmission mechanism.
According to Fig. 1, in erasure channel of the present invention, the compensation method of transmission of video packet loss low redundancy comprises following concrete steps:
Step 101: transmitting terminal by data upload to be sent to transmission processing end, and to the request of transmission processing end transmission processing;
Step 102: transmission processing end dissection process request, and according to the process information process data to be sent that process request is carried, in data to be sent, be added to redundancy packet, form new data to be sent;
Step 103: transmitting terminal sends new data to be sent to receiving terminal;
Step 104: receiving terminal receives data and by data upload to receiving end for process;
Step 105: receive end for process to data analysis, judge whether data exist packet loss phenomenon in transmitting procedure, if there is packet loss phenomenon, reduced by the data of redundancy packet to packet loss.
Transmission processing end is utilized to process data to be sent, redundancy packet is added in deal with data to be sent, even if ensure that packet loss phenomenon appears in data in transmitting procedure, receive end for process and also can carry out process reduction to the data after packet loss, thus decode complete data message.
As shown in Figure 2, in erasure channel of the present invention, the process of transmission of video packet loss low redundancy compensation method to data to be sent comprises following concrete steps:
Step 102a: data to be sent are divided into the data slot that k is isometric, each data slot length is n, if the length of last data slot is discontented with n, then in the end the afterbody of a data slot mends 0;
Step 102b: be numbered each data slot, will number, the information such as k value, n value form packets of information, packets of information be added in corresponding data fragment;
Step 102c: each data slot is carried out logical operation by turn, and operation result saves as redundancy packet;
Step 102d: redundancy packet is added data to be sent, forms new data to be sent.
The length cell of data slot is the data cell that the calculating such as byte, integer function directly processes, and is convenient to the processing speed accelerating computer, thus accelerates the transmission and reception speed of video data.Each data fragments, except valid data part, also added the packets of information that a data volume is less, has recorded the information such as the numbering of k value, n value and this data fragments, be convenient to receiving terminal and reduce to packet loss data in packets of information.By calculating redundancy packet to the process of data to be sent, the redundancy packet of different data to be sent is different, and redundancy packet and former data to be sent are formed new data to be sent, thus sends.In the process of fragment data to be sent being divided into k isometric, the valid data length of last data slot may be less than n, then the afterbody of an in the end data slot can mend 0, to meet follow-up logical operation.
New data to be sent are compared with former data to be sent, and its redundancy only has 1/k, and k larger (namely n is less), redundancy is less.K (or n) can adjust according to actual channel conditions.And k (or n) once specify, the redundancy of data is determined, can be predicted, is conducive to channel flow and controls.
As shown in Figure 3, after data have occurred packet loss phenomenon in the process of transmission, then receiving the reduction concrete steps of end for process to packet loss data in erasure channel of the present invention in the low redundancy compensation method of transmission of video packet loss has been:
Step 105a: the number of packet loss data is judged.
Step 105b: if packet loss data are greater than 1, then go back primary failure.
Step 105c: if packet loss data are 1, then packet loss data type is judged.
Step 105d: if packet loss data are data slot, then each fragment of data after packet loss and redundancy packet are carried out logical operation by turn, operation result is the fragment of loss of data.
Step 105e: if packet loss data are redundancy packet, then without the need to packet loss data convert, receiving terminal can directly decode the data received.
Obtained by above-mentioned, when packet loss data are greater than 1, go back primary failure, may only have in the data that now receiving terminal receives partial data can decoded and use.The present invention mainly for have in transmitting procedure and a fragment packet loss (and redundancy packet does not have packet loss), can be reduced by the fragment of logical operation by loss, namely do not need to retransfer can decode complete data message.The inventive method by the packet loss of channel with square relation decline, as: former packet loss is: 1/1000, uses the packet loss after the inventive method to be only: 1/1000000.Suppose when not doing any process, amount to transmission 1000 bag every 10 seconds, and there is a packet loss, after so using this method, approximately every 10000 seconds (3 hours) just there will be a packet loss and situation about cannot reduce, and visible video transmission and the effect play are very significantly improved.
In other embodiment, all the other technical characteristics are identical, and difference is, also comprise: be numbered redundancy packet the treatment step of data to be sent, and the numbering of redundancy packet is different from the numbering of data slot.Accept that end for process is easier to be judged data, understand redundancy packet and whether lose, and more convenient in the process of deal with data, be conducive to fast packet loss data being reduced.
In other embodiment, all the other technical characteristics are identical, and difference is, the process information entrained by process request comprises: k value and/or n value.For different data to be sent, it can be divided into the fragment of identical or different quantity, i.e. k value or n value, can be identical, can be different, can do corresponding adjustment according to concrete data to be sent and concrete channel situation.
In other embodiment, all the other technical characteristics are identical, and difference is, transmission processing end is consistent with the logical operation of reception end for process to data processing to the logical operation of data processing to be sent.When data occur packet loss in the process transmitted, consistent logical operation can ensure that the data of loss are reduced by receiving terminal accurately.
In other embodiment, all the other technical characteristics are identical, and difference is, logical operation is XOR.XOR is simple calculations mode in logical operation, and it reduces computational complexity while the feasibility ensureing the inventive method.
For example, suppose that data to be sent are in units of byte, 16 systems are expressed as 0x010x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x00 0x01 0x02 0x03 0x040x05 0x06 0x07 0x08 0x09 0x00 0x01 0x02, totally 22 bytes.If n=6, k=4, data to be sent are divided into 4 data slots, and it are numbered, be numbered 0 ..., k-1.Then:
0th fragment is: 0x01 0x02 0x03 0x04 0x05 0x06, for stating conveniently, is designated as D0;
1st fragment is: 0x07 0x08 0x09 0x00 0x01 0x02, for stating conveniently, is designated as D1;
2nd fragment is: 0x03 0x04 0x05 0x06 0x07 0x08, for stating conveniently, is designated as D2;
3rd fragment is: 0x09 0x00 0x01 0x02, and due to discontented 6 of the 3rd fragment, then mend 0 at afterbody, then the 3rd fragment is: 0x09 0x00 0x01 0x02 0x00 0x00, for stating conveniently, is designated as D3.
0th fragment is carried out logical operation by turn to the 3rd fragment, and logical operation is XOR, and oeprator is designated as xor.Then:
D0 xor D1 obtains 0x06,0x0A, 0x0A, 0x04,0x04,0x04, is designated as V0;
V0 xor D2 obtains 0x05 0x0E 0x0F 0x02 0x03 0x0C, is designated as V1;
V1 xor D3 obtains 0x0C 0x0E 0x0E 0x00 0x03 0x0C, and this is the data value of redundancy packet.Be numbered redundancy packet, be numbered k, then the 4th fragment is: 0x0C 0x0E0x0E 0x00 0x03 0x0C.
Redundancy packet is added in data to be sent and forms new transmission data and be: 0x01 0x020x03 0x04 0x05 0x06 0x07 0x08 0x09 0x00 0x01 0x02 0x03 0x04 0x050x06 0x07 0x08 0x09 0x00 0x01 0x02 0x00 0x00 0x0C 0x0E 0x0E 0x000x03 0x0C.
If in transmitting procedure, redundancy packet is not lost, there is loss in the 2nd fragment, then by the 0th fragment, the 1st fragment, the 3rd fragment and redundancy packet are carried out logical operation by turn, logical operation is XOR, then the 2nd fragment of can reducing is: 0x03 0x04 0x050x06 0x07 0x08.
By above-mentioned instantiation, can find, when data exist certain packet loss phenomenon in transmitting procedure, can be reduced by the data slot of redundancy packet by loss, thus complete decoding is carried out, without the need to data retransmission to data.
In sum, in erasure channel of the present invention, the compensation method of transmission of video packet loss low redundancy has some benefit following:
(1) redundancy that new data to be sent compare former data to be sent is very low, is only 1/k, and k larger (namely n is less), redundancy is less.K (or n) can adjust according to actual channel conditions.
(2) k (or n) once specify, determine, can be predicted, is conducive to channel flow and controls by the redundancy of data.
(3) if no more than one of the data fragments lost in same data, for the segment i that any one is lost, this segment can be recovered to restore by logical operation.Namely show that it is equivalent to do not have packet loss when a loss data slot.Mathematical operation can show, the method be equivalent to make channel packet loss with square relation decline.
(4) data operation quantity is fixed, and with the effective video data bulk linear proportional of transmission, namely for the data of each transmission, operand is O (k*n).
(5) there is no data re-transmission, requirement of real time, meet broadcast, multicast etc. simultaneously yet and be difficult to the occasion of carrying out data re-transmission.
The transmission that the present invention can be applicable to video data also can be applicable to the transmission of voice data or other types data, and the present invention is not construed as limiting.
Novel preferred implementation, it should be pointed out that for the person of ordinary skill of the art, and without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (10)
1. the low redundancy compensation method of transmission of video packet loss in erasure channel, for carrying out error free transport to video data, is characterized in that, comprising:
Transmitting terminal processes data to be sent, redundancy packet is added in described data to be sent, form new data to be sent and send to receiving terminal, if the data that described receiving terminal receives exist packet loss, described receiving terminal is reduced to packet loss data by described redundancy packet.
2. the low redundancy compensation method of transmission of video packet loss in erasure channel according to claim 1, is characterized in that, comprise following concrete steps:
(1) described transmitting terminal by described data upload to be sent to transmission processing end, and to the request of described transmission processing end transmission processing;
(2) described transmission processing end resolves described process request, and data to be sent described in the process information process of carrying according to described process request, in described data to be sent, be added to described redundancy packet, form new data to be sent;
(3) described transmitting terminal sends new data to be sent to described receiving terminal;
(4) described receiving terminal receives data and by data upload to described reception end for process;
(5) described reception end for process is to data analysis, judges whether data exist packet loss phenomenon in transmitting procedure, if there is packet loss phenomenon, is reduced to packet loss data by described redundancy packet.
3. the low redundancy compensation method of transmission of video packet loss in erasure channel according to claim 1 and 2, is characterized in that, comprise the following steps the process of described data to be sent:
(1) described data to be sent are divided into the data slot that k isometric, each described data slot length is n, if the length of data slot is discontented with n described in last, then in the end the afterbody of a described data slot mends 0;
(2) each described data slot is numbered;
(3) data slot described in each is carried out logical operation by turn, operation result saves as redundancy packet;
(4) described redundancy packet is added described data to be sent, form new data to be sent.
4. the low redundancy compensation method of transmission of video packet loss in erasure channel according to claim 3, it is characterized in that, to in the treatment step (1) of described data to be sent, the length cell of described data slot is the data cell that calculating function directly processes.
5. the low redundancy compensation method of transmission of video packet loss in erasure channel according to claim 4, is characterized in that, also comprise the treatment step of described data to be sent:
In each described data slot, add packets of information, in described packets of information, record the numbering of k value, n value and described data slot.
6. in the erasure channel according to claim 4 or 5, the low redundancy compensation method of transmission of video packet loss, is characterized in that, also comprises the treatment step of described data to be sent:
Be numbered described redundancy packet, the numbering of described redundancy packet is different from the numbering of described data slot.
7. the low redundancy compensation method of transmission of video packet loss in erasure channel according to claim 6, it is characterized in that, described reception end for process to the reduction treatment of packet loss data is:
The number of packet loss data and type are judged, if the number of packet loss data be one and for described redundancy packet time, by data after packet loss each described in data slot and described redundancy packet carry out logical operation by turn, operation result is the fragment of loss of data.
8. the low redundancy compensation method of transmission of video packet loss in erasure channel according to claim 7, is characterized in that, the described process information entrained by described process request comprises: k value and/or n value.
9. the low redundancy compensation method of transmission of video packet loss in the erasure channel according to claim 7 or 8, it is characterized in that, described transmission processing end is consistent with the logical operation of described reception end for process to data processing to the logical operation of described data processing to be sent.
10. the low redundancy compensation method of transmission of video packet loss in erasure channel according to claim 9, it is characterized in that, described logical operation is XOR.
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| CN113114526A (en) * | 2021-03-12 | 2021-07-13 | 广州技象科技有限公司 | Data transmission method and device based on sub-packet interference prevention |
| CN113114526B (en) * | 2021-03-12 | 2022-09-30 | 广州技象科技有限公司 | Data transmission method and device based on sub-packet interference prevention |
| CN114640867A (en) * | 2022-05-20 | 2022-06-17 | 广州万协通信息技术有限公司 | Video data processing method and device based on video stream authentication |
| CN116055010A (en) * | 2022-12-19 | 2023-05-02 | 华能信息技术有限公司 | Packet loss recovery method |
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