CN103166974A - Stream media wireless transmission method based on mix protocol of transmission control protocol and user datagram protocol - Google Patents
Stream media wireless transmission method based on mix protocol of transmission control protocol and user datagram protocol Download PDFInfo
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- CN103166974A CN103166974A CN2013101040001A CN201310104000A CN103166974A CN 103166974 A CN103166974 A CN 103166974A CN 2013101040001 A CN2013101040001 A CN 2013101040001A CN 201310104000 A CN201310104000 A CN 201310104000A CN 103166974 A CN103166974 A CN 103166974A
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Abstract
The invention discloses a stream media wireless transmission method based on a mix protocol of a transmission control protocol (TCP) and a user datagram protocol (UDP). The method combines characteristics of UDP transmission of low spending, high speed, high efficiency but unreliable transmission with characteristics of TCP transmission of large spending, low efficiency but reliable transmission, uses the UDP to package video and audio data with a data packet header with a fixed length, and simultaneously sends a video and audio data package with self-adapting data transmission speed. Control information of small size data retransmission, heartbeat and the like is transmitted through the TCP, so that the problem in the prior art that transmission efficiency and transmission reliability can not be simultaneously considered when only one protocol of the TCP or the UDP is used for transmitting data is solved, and high quality transmission of the video and audio data based on a wireless network is achieved.
Description
Technical field
The invention belongs to the audio, video data transmission technique field, be specifically related to a kind of Streaming Media radio transmitting method based on the TCP/UDP hybrid protocol.
Background technology
In present various emergency communication system schemes, the video/audio transmission of emergent video and audio communication terminal and command centre is mainly implemented based on wireless networks such as 3G, under this application scenario, the complexity of network environment will be considerably beyond traditional cable network, such as the characteristics such as the low bandwidth of wireless network, high bit error make traditional video and audio communication terminal effects based on wired networks design always unsatisfactory, show as time-delay, shake, flower screen, even occur looking audio transmission interruption etc., and this can't make us accepting in emergency communication.Therefore how based on all kinds of wireless networks, especially to carry out the high-quality transmission of video/audio be a realistic problem being badly in need of solution to the 3G wireless network of the company such as telecommunications, movement.
The wireless-transmission network that emergency communication is at present adopted mainly contains two kinds: the 3G network of telecommunications, UNICOM and the mobile public wireless broadband networks such as 4G network, perhaps private radio radio station.Because the public wireless broadband networks such as 3G/4G are all to have very significantly economic advantages in various aspects such as network coverage face, wireless network application cost, this network also becomes the main network of wireless multimedia transmission system.Consider based on the standardization of terminal and the compatibility of emergency communication system, nearly all Emer-gency Communication all adopts the IP transmission technology, therefore the present multimedia communication transmission technology based on wireless network also almost all is based on ICP/IP protocol, mainly contains following two kinds:
(1) based on udp protocol.
The characteristics of udp protocol are towards connectionless unreliable transmission, are also udp protocol to the overtime of grouping or abandon insensitive.In cable network, due to low error rate, the high-throughput of network, and strong computing capability and the error correcting capability of receiving terminal, thereby in cable network, can obtain effect preferably based on the multimedia transmission of udp protocol.Yet, with respect to cable network, have the limited weak terminal of a large amount of computing capabilitys in wireless network, their error correcting capability and buffer memory ability all a little less than, so for the grouping disappearance very responsive.More seriously, traditional merely based on the streaming media mode of udp protocol owing to there is no congestion control mechanism, so still can inject the mass data bag in network when the network generation is congested, causing occuring congested route abandons grouping, and then cause terminal to recover the sharply decline of video quality, will cause receiving terminal (decoder) collapse when serious.
(2) based on Transmission Control Protocol.
Nearest studies show that, increasing streaming video adopt TCP but not UDP as host-host protocol.But, the realization (as TCP-Reno, TCP-NewReno, TCP-SACK) of Transmission Control Protocol is all the indication of the loss of packet as network congestion at present, and then congestion window is reduced by half, cause transmission rate to present larger jitter, affected the display effect of receiving terminal.Especially under wireless high bit-error network, packet loss is due to link error but not congested to a great extent, blindly enters congestion control, can cause network utilization to reduce, and affects reception.
Summary of the invention
For the existing above-mentioned technical problem of prior art, the invention provides a kind of Streaming Media radio transmitting method based on the TCP/UDP hybrid protocol, the method has been taken into account data transmission efficiency and transmission reliability, has realized preferably the high-quality transmission of audio, video data based on wireless network.
A kind of Streaming Media radio transmitting method based on the TCP/UDP hybrid protocol comprises the steps:
(1) treat I frame, P frame and the B frame in transmitting video-frequency flow and the audio stream of synchronizeing with video flowing all carries out Data Segmentation, obtain a plurality of data fragmentations;
(2) for arbitrary data fragmentation, form packet to behind its encapsulation of data packet header; Travel through according to this each data fragmentation;
(3) adopt udp protocol that all packets are transferred to receiving terminal from transmitting terminal successively with initial transmission rate v0; After receiving terminal received first packet, receiving terminal was initiatively set up control channel with transmitting terminal by Transmission Control Protocol;
(4) receiving terminal according to reception condition by described control channel to the transmitting terminal bag that sends control information, transmitting terminal according to described control information bag with retransmission data packet may or regulate transmission rate.
Comprise successively in described data packet head: frame type, postamble mark, data compression format, sequence number, timestamp and burst length.
Comprise command number, control information data and data length thereof in described control information bag.
In described step (4), receiving terminal is by resolving the packet that receives, and when t a plurality of packet continuous whole that in time second, receiving terminal receives, receiving terminal sends control information to transmitting terminal by control channel and wraps K1.
In described step (4), after receiving terminal often receives x packet, whether continuous by packet being carried out this x of analysis judgment packet; If not, receiving terminal builds control information bag K2 according to the sequence number of missing data bag, and by control channel to the transmitting terminal bag K2 that sends control information; Transmitting terminal receives after control information bag K2 by it is resolved, with the data packet retransmission of correspondence disappearance to receiving terminal.
After described receiving terminal sent a control information bag K2, if also do not receive the packet of the corresponding disappearance of control information bag K2 in the m millisecond time, receiving terminal again sent control information to transmitting terminal by control channel and wraps K2.
After described receiving terminal sends n the control information bag K2 about same missing data bag to transmitting terminal, do not receive yet the packet of this disappearance, receiving terminal sends control information to transmitting terminal by control channel and wraps K3; If transmitting terminal is sending about the packet of video flowing and receiving control information bag K3, transmitting terminal stops sending the packet of video flowing present frame, and begins to send packet to receiving terminal successively from first packet of next I frame of present frame.
After described transmitting terminal often receives a control information bag K1, by accelerating with transmission rate v
aSend packet, v to receiving terminal
a=(1+k) v
i, v
iBe the transmission rate before accelerating, k is given adjustment factor.
After described transmitting terminal often receives a control information bag K3, by slowing down with transmission rate v
bSend packet, v to receiving terminal
b=(1-k) v
j, v
jBe the transmission rate before slowing down, k is given adjustment factor.
T, n, m, x are the natural number greater than 0.
the present invention is little the udp protocol transport overhead, speed is fast, efficient is high but transmit insecure characteristics and the Transmission Control Protocol transport overhead is large, efficient is low but transmit reliable characteristics and combine, adopt udp protocol that the data packet head of video/audio with regular length encapsulated, carrying out the video/audio bag by adaptive data transmission speed simultaneously sends, the data re-transmission of small data quantity, the control informations such as heartbeat are transmitted by Transmission Control Protocol, just utilize TCP or UDP single-protocol to carry out the efficiency of transmission of transfer of data and the problem that transmission reliably can't take into account in the prior art thereby solved, realized well the high-quality transmission based on the video/audio of wireless network.
Description of drawings
Fig. 1 is the workflow schematic diagram of receiving terminal.
Fig. 2 is the workflow schematic diagram of transmitting terminal.
Embodiment
In order more specifically to describe the present invention, below in conjunction with the drawings and the specific embodiments, technical scheme of the present invention is elaborated.
As depicted in figs. 1 and 2, a kind of Streaming Media radio transmitting method based on the TCP/UDP hybrid protocol comprises the steps:
(1) treat I frame, P frame and the B frame in transmitting video-frequency flow and the audio stream of synchronizeing with video flowing all carries out Data Segmentation, obtain a plurality of data fragmentations; Each data fragmentation is take 600 bytes as unit, and last data fragmentation of I frame, P frame, B frame or audio stream can be the data fragmentation of 600 bytes of less than.
The I frame represents the key frame in video flowing, and the P frame represents the difference of present frame and former frame, and the B frame represents the difference of present frame and front and back two frames.
(2) for arbitrary data fragmentation, form packet to behind its encapsulation of data packet header; Travel through according to this each data fragmentation;
The structure of packet is as shown in table 1; Comprise successively frame type, postamble mark, data compression format, sequence number, timestamp and burst length in data packet head, its structure is as shown in table 2:
Table 1
| Data packet head | Data fragmentation |
Table 2
In present embodiment, about frame type: if data fragmentation belongs to the I frame, frame type is 00; If data fragmentation belongs to the P frame, frame type is 01; If data fragmentation belongs to the B frame, frame type is 10; If data fragmentation belongs to audio stream, frame type is 11.
About the postamble mark: if data fragmentation is last data fragmentation of I frame, P frame, B frame or audio stream, postamble is labeled as 1; If not, postamble is labeled as 0.
About data compression format: if the compression algorithm of the video flowing that data fragmentation belongs to or audio stream is the G711 standard, data compression format is 1; 2 expression G726 standards, 3 expression GSM standard, 4 expression AMR standards, 16 expression mpeg 4 standards, 17 expression H264 standards.
About sequence number: give each packet with sequence number 0～65535 successively, exceed 65535 again since 0～65535 assignment.
About timestamp: for each packet is given a timestamp, the timestamp C of current data packet
i=(t
i-t
0) T+C
0t
iBe the moment corresponding to current data packet, t
0Be the moment corresponding to first packet of video flowing or audio stream, C
0Be the timestamp of first packet of video flowing or audio stream, T is proportionality coefficient; Wherein, C
0Be the value of random initializtion, for video flowing T=90000, for audio stream T=8000.
About burst length: the size that is used for the expression data fragmentation.
(3) adopt udp protocol with all packets with initial transmission rate v
0Transfer to receiving terminal from transmitting terminal successively; After receiving terminal receives first packet, receiving terminal by Transmission Control Protocol initiatively and transmitting terminal set up a reliable and long control channel that is connected, this channel be used for transmission transmitting terminal and receiving terminal signal post need control information.In present embodiment, v
0=16384 byte per seconds.
(4) receiving terminal according to reception condition by control channel to the transmitting terminal bag that sends control information, transmitting terminal according to the control information bag with retransmission data packet may or regulate transmission rate.
Comprise command number, control information data and data length thereof in the control information bag, its structure is as shown in table 3:
Table 3
In present embodiment, receiving terminal is by resolving the packet that receives, when t a plurality of packet continuous whole that in time second, receiving terminal receives, receiving terminal is 11 by control channel to the transmitting terminal bag K1(command number that sends control information, data length is 0, and the control information data are null); T is set to 1s.
After transmitting terminal often receives a control information bag K1, by accelerating with transmission rate v
aSend packet, v to receiving terminal
a=(1+k) v
i, v
iBe the transmission rate before accelerating, k is given adjustment factor; K is set to 0.1.
After receiving terminal often receives x packet, whether continuous by packet being carried out this x of analysis judgment packet; If not, receiving terminal is 21 according to the sequence number structure control information bag K2(command number of missing data bag, the control information data are the sequence number of missing data bag, and data length is the length of sequence number), and by control channel to transmitting terminal send control information the bag K2; Transmitting terminal receives after control information bag K2 by it is resolved, with the data packet retransmission of correspondence disappearance to receiving terminal; X is set to 5.
After receiving terminal sent a control information bag K2, if also do not receive the packet of the corresponding disappearance of control information bag K2 in the m millisecond time, receiving terminal again sent control information to transmitting terminal by control channel and wraps K2; M is set to 100.
After receiving terminal sends n the control information bag K2 about same missing data bag to transmitting terminal, do not receive yet the packet of this disappearance, receiving terminal is 31 by control channel to the transmitting terminal bag K3(command number that sends control information, and data length is 0, and the control information data are null); If transmitting terminal is sending about the packet of video flowing and receiving control information bag K3, transmitting terminal stops sending the packet of video flowing present frame, and begins to send packet to receiving terminal successively from first packet of next I frame of present frame; N is set to 3.
After transmitting terminal often receives a control information bag K3, by slowing down with transmission rate v
bSend packet, v to receiving terminal
b=(1-k) v
j, v
jBe the transmission rate before slowing down.
Claims (9)
1. the Streaming Media radio transmitting method based on the TCP/UDP hybrid protocol, comprise the steps:
(1) treat I frame, P frame and the B frame in transmitting video-frequency flow and the audio stream of synchronizeing with video flowing all carries out Data Segmentation, obtain a plurality of data fragmentations;
(2) for arbitrary data fragmentation, form packet to behind its encapsulation of data packet header; Travel through according to this each data fragmentation;
(3) adopt udp protocol that all packets are transferred to receiving terminal from transmitting terminal successively with initial transmission rate v0; After receiving terminal received first packet, receiving terminal was initiatively set up control channel with transmitting terminal by Transmission Control Protocol;
(4) receiving terminal according to reception condition by described control channel to the transmitting terminal bag that sends control information, transmitting terminal according to described control information bag with retransmission data packet may or regulate transmission rate.
2. Streaming Media radio transmitting method according to claim 1, is characterized in that: comprise successively in described data packet head: frame type, postamble mark, data compression format, sequence number, timestamp and burst length.
3. Streaming Media radio transmitting method according to claim 1, is characterized in that: comprise command number, control information data and data length thereof in described control information bag.
4. Streaming Media radio transmitting method according to claim 1, it is characterized in that: in described step (4), receiving terminal is by resolving the packet that receives, when t a plurality of packet continuous whole that in time second, receiving terminal receives, receiving terminal sends control information to transmitting terminal by control channel and wraps K1, and t is the natural number greater than 0.
5. whether Streaming Media radio transmitting method according to claim 1, is characterized in that: in described step (4), after receiving terminal often receives x packet, continuous by packet being carried out this x of analysis judgment packet; If not, receiving terminal builds control information bag K2 according to the sequence number of missing data bag, and by control channel to the transmitting terminal bag K2 that sends control information; Transmitting terminal receives after control information bag K2 by it is resolved, and to receiving terminal, x is the natural number greater than 0 with the data packet retransmission of correspondence disappearance.
6. Streaming Media radio transmitting method according to claim 5, it is characterized in that: after described receiving terminal sends a control information bag K2, if also do not receive the packet of the corresponding disappearance of control information bag K2 in the m millisecond time, receiving terminal again sends control information to transmitting terminal by control channel and wraps K2, and m is the natural number greater than 0.
7. Streaming Media radio transmitting method according to claim 6, it is characterized in that: after receiving terminal sends n the control information bag K2 about same missing data bag to transmitting terminal, do not receive yet the packet of this disappearance, receiving terminal sends control information to transmitting terminal by control channel and wraps K3; If transmitting terminal is sending about the packet of video flowing and is receiving control information bag K3, transmitting terminal stops sending the packet of video flowing present frame, and begin to send packet to receiving terminal successively from first packet of next I frame of present frame, n is the natural number greater than 0.
8. Streaming Media radio transmitting method according to claim 4, is characterized in that: after described transmitting terminal often receives a control information bag K1, by accelerating with transmission rate v
aSend packet, v to receiving terminal
a=(1+k) v
i, v
iBe the transmission rate before accelerating, k is given adjustment factor.
9. Streaming Media radio transmitting method according to claim 7, is characterized in that: after described transmitting terminal often receives a control information bag K3, by slowing down with transmission rate v
bSend packet, v to receiving terminal
b=(1-k) v
j, v
jBe the transmission rate before slowing down, k is given adjustment factor.
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| CN104618337A (en) * | 2014-12-31 | 2015-05-13 | 浙江理工大学 | TCP/UDP (Transmission Control Protocol and User Datagram Protocol) mixed protocol based streaming media wireless self-adaptive transmission method |
| CN105049915A (en) * | 2015-06-30 | 2015-11-11 | 株洲南车时代电气股份有限公司 | Locomotive video data integrity automatic detection method |
| CN105119968A (en) * | 2015-07-15 | 2015-12-02 | 天脉聚源（北京）教育科技有限公司 | Picture transmission method and device |
| CN105391718A (en) * | 2015-11-19 | 2016-03-09 | 小红象医疗科技有限公司 | Method for realizing infrared medical image wireless transmission |
| CN107707933A (en) * | 2017-10-18 | 2018-02-16 | 中国联合网络通信集团有限公司 | Send, receive the method and device of video flowing |
| CN107888865A (en) * | 2017-11-28 | 2018-04-06 | 福建星海通信科技有限公司 | A kind of communication means of audio frequency and video, system and device |
| CN109450908A (en) * | 2018-11-23 | 2019-03-08 | 工业互联网创新中心（上海）有限公司 | Communication means based on distributed message |
| CN109861797A (en) * | 2017-12-28 | 2019-06-07 | 北京新岸线移动通信技术有限公司 | A kind of data transmission method and system |
| CN110602448A (en) * | 2019-08-30 | 2019-12-20 | 湖南正申科技有限公司 | Real-time multi-view audio and video transmission method |
| CN111107398A (en) * | 2019-12-27 | 2020-05-05 | 深圳市小溪流科技有限公司 | Streaming media data transmission method and receiving method, and electronic device |
| US10959125B2 (en) | 2018-12-19 | 2021-03-23 | Industrial Technology Research Institute | Collaborative transmission method and transmission device based on UDP and TCP connections |
| CN112565430A (en) * | 2020-12-08 | 2021-03-26 | 上证所信息网络有限公司 | Low-delay reliable transmission method of multi-market data in wide area network |
| CN115065733A (en) * | 2022-04-14 | 2022-09-16 | 中国银行股份有限公司 | Data publishing and subscribing system, data publishing method and data subscribing method |
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| CN104618337B (en) * | 2014-12-31 | 2018-01-02 | 浙江理工大学 | A kind of Streaming Media based on TCP/UDP hybrid protocols is wireless adaptive transmission method |
| CN104618337A (en) * | 2014-12-31 | 2015-05-13 | 浙江理工大学 | TCP/UDP (Transmission Control Protocol and User Datagram Protocol) mixed protocol based streaming media wireless self-adaptive transmission method |
| CN105049915A (en) * | 2015-06-30 | 2015-11-11 | 株洲南车时代电气股份有限公司 | Locomotive video data integrity automatic detection method |
| CN105049915B (en) * | 2015-06-30 | 2019-01-22 | 株洲南车时代电气股份有限公司 | A kind of engine video frequency data integrity automatic testing method |
| CN105119968A (en) * | 2015-07-15 | 2015-12-02 | 天脉聚源（北京）教育科技有限公司 | Picture transmission method and device |
| CN105391718A (en) * | 2015-11-19 | 2016-03-09 | 小红象医疗科技有限公司 | Method for realizing infrared medical image wireless transmission |
| CN107707933A (en) * | 2017-10-18 | 2018-02-16 | 中国联合网络通信集团有限公司 | Send, receive the method and device of video flowing |
| CN107888865A (en) * | 2017-11-28 | 2018-04-06 | 福建星海通信科技有限公司 | A kind of communication means of audio frequency and video, system and device |
| CN109861797B (en) * | 2017-12-28 | 2022-07-15 | 北京新岸线移动通信技术有限公司 | Data transmission method and system |
| CN109861797A (en) * | 2017-12-28 | 2019-06-07 | 北京新岸线移动通信技术有限公司 | A kind of data transmission method and system |
| CN109450908A (en) * | 2018-11-23 | 2019-03-08 | 工业互联网创新中心（上海）有限公司 | Communication means based on distributed message |
| US10959125B2 (en) | 2018-12-19 | 2021-03-23 | Industrial Technology Research Institute | Collaborative transmission method and transmission device based on UDP and TCP connections |
| CN110602448B (en) * | 2019-08-30 | 2021-10-22 | 湖南正申科技有限公司 | Real-time multi-view audio and video transmission method |
| CN110602448A (en) * | 2019-08-30 | 2019-12-20 | 湖南正申科技有限公司 | Real-time multi-view audio and video transmission method |
| CN111107398A (en) * | 2019-12-27 | 2020-05-05 | 深圳市小溪流科技有限公司 | Streaming media data transmission method and receiving method, and electronic device |
| CN112565430A (en) * | 2020-12-08 | 2021-03-26 | 上证所信息网络有限公司 | Low-delay reliable transmission method of multi-market data in wide area network |
| CN115065733A (en) * | 2022-04-14 | 2022-09-16 | 中国银行股份有限公司 | Data publishing and subscribing system, data publishing method and data subscribing method |
| CN115065733B (en) * | 2022-04-14 | 2024-04-16 | 中国银行股份有限公司 | Data publishing and subscribing system, data publishing method and data subscribing method |
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