CN115348481B - Data transmission method, device, transmitter and receiver - Google Patents
Data transmission method, device, transmitter and receiver Download PDFInfo
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- CN115348481B CN115348481B CN202210974841.7A CN202210974841A CN115348481B CN 115348481 B CN115348481 B CN 115348481B CN 202210974841 A CN202210974841 A CN 202210974841A CN 115348481 B CN115348481 B CN 115348481B
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/218—Source of audio or video content, e.g. local disk arrays
- H04N21/2183—Cache memory
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
- H04N21/23106—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
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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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
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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
- H04N21/643—Communication protocols
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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
- H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
- H04N21/64738—Monitoring network characteristics, e.g. bandwidth, congestion level
Abstract
The invention provides a data transmission method, a data transmission device, a transmitter and a receiver, and belongs to the technical field of communication. The method comprises the following steps: acquiring the transmission delay of the current network and the maximum transmission delay allowed by the current network; judging whether the maximum transmission time delay allowed by the current network is smaller than a service time delay threshold value or not; determining the ratio of the service delay threshold to the transmission delay of the current network as the maximum number of the buffered data packets of the current buffer area in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold; caching the corresponding data packets in a cache area of a transmitting end according to the maximum cached data packet quantity; and sending the data packet of the current buffer area to a receiver. The method can solve the problem that the time delay requirement of the cloud terminal cannot be met when the existing SRT protocol is applied to the cloud terminal scene in the prior art, and is suitable for the scene of data transmission based on the SRT protocol.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method, a data transmission device, a transmitter, and a receiver.
Background
Cloud terminals are terminal devices running in the cloud, connect to a system desktop of the cloud through a specific communication protocol (such as a cloud desktop technology communication protocol of VDI (Virtual Desktop Infrastructure, virtual desktop architecture), RDS (Remote Desktop Services, remote desktop service) and the like), display the system desktop to the front end, and redirect output and input data of the cloud terminals to a cloud server. The cloud terminal concentrates main operation resources (such as a CPU, a memory, a hard disk, a network and the like) on the cloud server, so that the management is centralized, the deployment is convenient, the maintenance amount is less, the use cost is low, and the purchase cost of the local equipment hardware configuration is low.
The SRT (Secure Reliable Transport, secure and reliable transmission) protocol reserves the core thought and mechanism of the UDT (UDP-based Data Transfer Protocol, data transmission protocol), has strong packet loss resistance, is suitable for complex networks, and is mainly used for video transmission. The anti-lost packet of the SRT is mainly solved by a buffer memory and packet loss retransmission mechanism, and under the current SRT packet loss retransmission mechanism, if a message is lost in network transmission, a transmitting end can retransmit.
Although the SRT protocol realizes low-latency transmission based on the UDT, a packet loss retransmission mechanism is provided, which reduces the screen-splash phenomenon caused by frame loss, but also causes delay of video stream. The document sharing of the cloud terminal, the cloud PC (Personal Computer ) and other services have higher requirements on the time delay of the video output part, but are insensitive to frame loss, so that the time delay requirement of the cloud terminal cannot be met if the existing SRT protocol is applied to the cloud terminal scene.
Therefore, providing a data transmission scheme for enabling the SRT to adapt to the cloud terminal scenario is a problem to be solved urgently.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a data transmission method, a data transmission device, a transmitter and a receiver aiming at the defects in the prior art, so as to at least solve the problem that the time delay requirement of a cloud terminal cannot be met when the existing SRT protocol in the related art is applied to a cloud terminal scene.
In a first aspect, the present invention provides a data transmission method, applied to a transmitter, the method comprising: acquiring the transmission delay of the current network and the maximum transmission delay allowed by the current network; judging whether the maximum transmission time delay allowed by the current network is smaller than a service time delay threshold value or not; determining the ratio of the service delay threshold to the transmission delay of the current network as the maximum number of the buffered data packets of the current buffer area in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold; caching the corresponding data packets in a cache area of a transmitting end according to the maximum cached data packet quantity; and sending the data packet of the buffer area to a receiver.
Preferably, after transmitting the data packet of the buffer to the receiver, the method further comprises: and adjusting the number of the data packets in the buffer area according to the change trend of the transmission delay of the current network.
Preferably, the adjusting the number of the data packets in the buffer according to the trend of the transmission delay of the current network specifically includes: acquiring the difference of transmission delays of two adjacent data transmissions of a current network, wherein the difference of the transmission delays of the two adjacent data transmissions of the current network is equal to the transmission delay of the current network minus the transmission delay of the network in the previous data transmission; judging whether the difference between the transmission time delays of two adjacent data transmission of the current network is larger than a first threshold value or not; and randomly deleting the data packets with the target number in the buffer area in response to the difference between the transmission delays of the adjacent two data transmissions of the current network being greater than a first threshold.
Preferably, the adjusting the number of the data packets in the buffer according to the trend of the transmission delay of the current network further includes: and increasing the target number of data packets in the buffer area in response to the difference between the transmission delays of two adjacent data transmissions of the current network being smaller than a first threshold.
Preferably, the acquiring the transmission delay of the current network specifically includes: transmitting a flow data packet to a receiver so that the receiver returns a Round Trip Time (RTT) to the transmitter according to the flow data packet; simultaneously, acquiring a first moment and a second moment corresponding to two adjacent time stamps in a control message; and calculating the transmission time delay of the current network according to the RTT, the first time and the second time.
Preferably, calculating the transmission delay of the current network according to the RTT, the first time and the second time specifically includes: calculating the half value of the RTT to obtain one-way time delay; calculating the difference between the second time and the first time to obtain the difference between the time of the data packets of the adjacent two data transmissions of the current network; and calculating the sum of the one-way time delay and the time difference between the data packets of the adjacent two data transmissions of the current network to obtain the sending time delay of the current network.
Preferably, the obtaining the maximum transmission delay allowed by the current network specifically includes: obtaining the maximum transmission delay allowed by the current network according to the following formula: maximum transmission delay allowed by the current network = transmission delay of the current network + (1 + a second threshold), wherein the second threshold is the maximum allowed threshold.
In a second aspect, the present invention further provides a data transmission method, applied to a receiver, the method comprising: acquiring the transmission delay of the current network and the maximum transmission delay allowed by the current network; judging whether the maximum transmission time delay allowed by the current network is smaller than a service time delay threshold value or not; determining the ratio of the service delay threshold to the transmission delay of the current network as the maximum number of the buffered data packets of the current buffer area in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold; receiving a data packet sent by a sender; and caching the data packets with corresponding quantity in a cache area according to the maximum cached data packet quantity.
In a third aspect, the present invention also provides a data transmission device, applied to a transmitter, including: the first acquisition module is used for acquiring the transmission delay of the current network and the maximum transmission delay allowed by the current network. The first judging module is connected with the first acquiring module and is used for judging whether the maximum transmission time delay allowed by the current network is smaller than a service time delay threshold value. The first determining module is connected with the first judging module and is used for determining the ratio of the service delay threshold to the transmission delay of the current network as the maximum number of the data packets in the current buffer area in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold. The first buffer module is connected with the first determining module and is used for buffering the data packets with corresponding quantity in the buffer area of the transmitting end according to the quantity of the maximum buffered data packets. And the sending module is connected with the first buffer module and is used for sending the data packet of the buffer area to the receiver.
In a fourth aspect, the present invention also provides a data transmission device, applied to a receiver, including: and the second acquisition module is used for acquiring the transmission delay of the current network and the maximum transmission delay allowed by the current network. And the second judging module is connected with the second acquiring module and is used for judging whether the maximum transmission time delay allowed by the current network is smaller than a service time delay threshold value. And the second determining module is connected with the second judging module and is used for determining the ratio of the service delay threshold to the transmission delay of the current network as the maximum number of the data packets in the current buffer area in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold. And the receiving module is used for receiving the data packet sent by the sender. The second buffer module is connected with the receiving module and the second determining module and is used for buffering the data packets with corresponding quantity in the buffer area according to the quantity of the maximum buffered data packets.
In a fifth aspect, the invention also provides a transmitter comprising a memory in which a computer program is stored and a processor arranged to run the computer program to implement the data transmission method as claimed in any of the first aspects.
In a sixth aspect, the invention also provides a receiver comprising a memory having a computer program stored therein and a processor arranged to run the computer program to implement the data transmission method according to the second aspect.
According to the data transmission method, the data transmission device, the transmitter and the receiver, whether the maximum transmission time delay allowed by the current network meets the service time delay threshold of the cloud terminal is judged, if so, the data packets can be cached in the current transmitter or the current receiver, the number of the maximum data packets which can be cached in the current network is determined, and the transmitter/receiver can cache the data packets corresponding to the number of the maximum data packets in the cache area. The invention improves the influence of the current network time delay on the service by determining the number of the data packets which can be cached in the current cache region in real time, so that the SRT can realize a packet loss retransmission mechanism under the condition that the service time delay requirement of the cloud terminal is always met, the data transmission quality is ensured, and the self-adaptability of the SRT to the cloud terminal service is finally realized.
Drawings
FIG. 1 is a schematic diagram of a buffer setting of an SRT protocol;
fig. 2 is a schematic diagram of an SRT ACK packet loss retransmission mechanism;
fig. 3 is a flow chart of a data transmission method in embodiment 1 of the present invention;
fig. 4 is a flow chart of a data transmission method in embodiment 2 of the present invention;
fig. 5 is a flow chart of a data transmission method in embodiment 4 of the present invention;
fig. 6 is a schematic structural diagram of a data transmission device according to embodiment 5 of the present invention;
fig. 7 is a schematic structural diagram of a data transmission device according to embodiment 6 of the present invention;
fig. 8 is a schematic diagram of a transmitter according to embodiment 7 of the present invention.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings.
It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention, and are not limiting of the invention.
It is to be understood that the various embodiments of the invention and the features of the embodiments may be combined with each other without conflict.
It is to be understood that only the portions relevant to the present invention are shown in the drawings for convenience of description, and the portions irrelevant to the present invention are not shown in the drawings.
It should be understood that each unit and module in the embodiments of the present invention may correspond to only one physical structure, may be formed by a plurality of physical structures, or may be integrated into one physical structure.
It will be appreciated that, without conflict, the functions and steps noted in the flowcharts and block diagrams of the present invention may occur out of the order noted in the figures.
It is to be understood that the flowcharts and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatuses, devices, methods according to various embodiments of the present invention. Where each block in the flowchart or block diagrams may represent a unit, module, segment, code, or the like, which comprises executable instructions for implementing the specified functions. Moreover, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by hardware-based systems that perform the specified functions, or by combinations of hardware and computer instructions.
It should be understood that the units and modules related in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, for example, the units and modules may be located in a processor.
Example 1:
the anti-lost packet of the SRT is mainly solved by a caching and packet loss retransmission mechanism. As shown in fig. 1, the SRT has a receiving buffer at the receiving end, and a sending buffer at the sending end, where the buffer is used for storing the data packet that needs to be retransmitted. In addition, the Timestamp in the SRT control message represents a 32-bit Timestamp, so that the time of the message can be accurately recorded. A packet loss retransmission ACK (Acknowledgement) mechanism used by SRT, taking fig. 2 as an example, assume that a sender buffer sends five data packets: 1. 2, 3, 4, 5 to the receiving end buffer, after the receiving end buffer receives the data packets successfully, the receiving end buffer will send ACK-positive acknowledgement to the sending end buffer, the sending end receives ACK-positive acknowledgement and then recovers the space, deletes five data packets 1, 2, 3, 4, 5 and prepares to send data packet 6. If the message is lost in the network transmission, the sender will resend. In addition, SRT also specifies an ACKACK and RTT (Round Trip Time) for calculating network delay. The receiving end feeds back an ACK indicating successful reception to the transmitting end after receiving the data packet, and the transmitting end sends an ACK again to the opposite end after receiving the ACK from the receiving end to indicate that the ACK is received. The difference between the time of sending the ACK at the receiving end and the time of receiving the corresponding ACKACK is RTT, and RTT is a measure of time and represents the time consumption of one round trip of the message. Since SRT cannot measure unidirectional time consumption, this implementation uses RTT/2 to represent unidirectional time consumption. The RTT is calculated by the receiving end, the calculated RTT is sent to the sending end through the ACK, and the sending end can acquire the transmission quality of the current network.
According to the embodiment, the influence of network jitter on the data packets is judged by knowing the time delay condition of SRT transmitted on the current network and combining the requirement of cloud terminal service on the time delay, and the number of the data packets which can be cached in the current cache region is determined in real time, so that the self-adaption of the SRT on the cloud terminal service is realized. In order to facilitate understanding of the following embodiments, parameters involved in the present embodiment are:
(1) An INPUT_delay, a service delay threshold, namely the maximum delay required by a service end;
(2) The actual Time recorded by the Timestamp 32-bit Timestamp in the Time_data SRT control message;
(3) RTT, round trip delay, i.e. the time taken for one round trip of a message;
(4) View_delay, one-way delay, view_delay=rtt/2;
(5) Send_bit_max, the current maximum number of buffered packets;
(6) Delta time_data, the difference between packet times of two adjacent data transmissions of the current network, i.e., delta time_data=time_data n+1 -Time_data n ；
(7) Send_delay, the transmission delay of the current network, send_delay=oneway_delay+Δtime_data;
(8) Δsend_delay, the difference between the transmission delays of two adjacent data transmissions of the current network, i.e., Δsend_delay=send_delay n+1 -SEND_delay n ；
(9) Threshold, the second Threshold, i.e. the maximum Threshold allowed, may be set to 0.2 or other value greater than 0. The purpose of the second threshold is to prevent loss of data packets due to short network jitter, thereby reducing video quality.
As shown in fig. 3, the present embodiment provides a data transmission method applied to a transmitter, or an encoder, where the transmitter or the encoder is disposed on a cloud terminal, the method includes:
Specifically, acquiring the sending delay send_delay of the current network includes: transmitting a flow data packet to a receiver so that the receiver returns a Round Trip Time (RTT) to the transmitter according to the flow data packet; simultaneously, acquiring first Time Time_data corresponding to two adjacent Time stamps in a control message 1 And a second Time Time_data 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the RTT, the time_data at the first moment 1 And the second Time Time_data 2 And calculating the sending delay SEND_delay of the current network.
In this embodiment, the sender receives the RTT returned by the receiver, and calculates a half value (i.e. RTT/2) of the RTT to obtain the unidirectional delay time oneway_delay; then calculates the second Time Time_data 2 Time_data with the first Time 1 To obtain the difference delta time_data of the packet Time of the adjacent two data transmissions of the current network; and calculating the sum of the one-way delay ONEWAY_delay and the difference delta Time_data between the packet Time of two adjacent data transmission of the current network to obtain the transmission delay of the current network, namely SEND_delay=ONEWAY_delay+delta Time_data.
Specifically, obtaining the maximum transmission delay allowed by the current network includes: obtaining the maximum transmission delay allowed by the current network according to the following formula: maximum transmission delay allowed by the current network = transmission delay of the current network + (1 + second Threshold), where the second Threshold is the maximum allowed Threshold.
In this embodiment, the second Threshold is greater than 0, and preferably may be set to 0.2. The maximum transmission delay allowed by the current network can be understood as the delay caused by packet loss retransmission due to small-scale jitter of the network in a short time on the basis of the transmission delay of the current network. In other words, by setting the second threshold (i.e. the maximum allowable threshold), the situation that the quality of service is reduced by adjusting the number of buffered packets in real time due to small-scale jitter occurring in a short time of the network to affect the discontinuity of the video stream can be prevented.
In this embodiment, the sender may obtain a service delay threshold value input_delay from the service module, where the service delay threshold value is related to a service property. For example, remote operation requiring real-time interaction, the service delay threshold should be less than 50ms; and for the receiving end of the video conference, the service delay threshold can be set to 80ms. The threshold is configured prior to service opening.
And step 103, determining the ratio of the service delay threshold to the transmission delay of the current network as the maximum number of the buffered data packets of the current buffer area in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold.
In this embodiment, when input_delay > send_delay (1+threshold), the data packets may be buffered in the buffer of the current sender, and the maximum number of buffered data packets that can be buffered in the current buffer send_bit_max=input_delay/send_delay. It should be noted that, because the network delay is dynamically changed in the whole data transmission process, the maximum number of buffered data packets in the buffer area determined according to the current network transmission delay is also dynamically changed, and the SRT is capable of adapting to the delay requirement of the cloud terminal service by determining the number of data packets in the buffer area in real time. If the maximum transmission delay allowed by the current network is greater than the service delay threshold, ending the flow, and indicating that the SRT packet loss retransmission of the current network can not meet the delay requirement of the service, so that the buffer area of the transmitter can not store the data packet.
Optionally, after sending the data packet of the buffer area to the receiver, the data transmission method further includes:
and step 106, adjusting the number of the data packets in the buffer area according to the change trend of the transmission delay of the current network.
In this embodiment, the trend of the transmission delay of the current network may be calculated by the difference between the transmission delays of two adjacent data transmissions or the ratio of the transmission delays of two adjacent data transmissions, for example, the ratio of the transmission delays of two adjacent data transmissions is equal to the ratio of the transmission delay of the current network to the transmission delay of the network during the previous data transmission, if the ratio of the transmission delays of two adjacent data transmissions is greater than a third threshold (e.g., the third threshold is 1), it is indicated that the transmission delay is greater, and the target number of data packets in the buffer area are randomly deleted; if the ratio of the transmission delays of two adjacent data transmissions is smaller than a third threshold, the transmission delay is reduced, and the target number of data packets is increased in the buffer area. Because the network delay is dynamically changed in the whole data transmission process, the data packet quantity is adjusted in real time according to the change trend of the sending delay on the basis of the buffer data packet quantity determined in the previous data transmission process, and the self-adaptive adjustment effect of the network can be rapidly realized, so that the influence of the network delay on the service is rapidly improved.
Optionally, step 106: the data packet quantity of the buffer area is adjusted according to the change trend of the transmission delay of the current network, and the method specifically comprises the following steps:
step 1061, obtaining a difference between transmission delays of two adjacent data transmissions of the current network, where the difference Δsend_delay between the transmission delays of the two adjacent data transmissions of the current network is equal to the transmission delay send_delay of the current network n+1 Subtracting the SEND delay of the network at the previous data transmission n 。
Step 1062, determining whether the difference Δsend_delay between the transmission delays of two adjacent data transmissions of the current network is greater than a first threshold.
Step 1063, in response to the difference Δsend_delay between the transmission delays of two adjacent data transmissions of the current network being greater than a first threshold, randomly deleting the target number of data packets in the buffer.
In the present embodimentThe first threshold may be set to 0 when ΔSEND_delay>And 0, indicating that the transmission time delay is increased, and randomly deleting the data packets with the target number in the buffer area so as to reduce the transmission time delay and improve the influence of the current network time delay on the service. The method for deleting the data packets randomly can prevent the condition that the video is interrupted due to deleting continuous data packets. Wherein the target number is equal to the maximum number of buffered data packets in the current buffer minus the maximum number of buffered data packets in the buffer at the previous data transmission, i.e., target number = send_bit_max n+1 -SEND_bitrate_max n 。
Optionally, step 106 further includes:
in step 1064, in response to the difference between the transmission delays of two adjacent data transmissions of the current network being less than a first threshold, a target number of data packets is added to the buffer.
In the present embodiment, when Δsend_delay<0, which indicates that the transmission delay becomes smaller, the number of data packets in the buffer area can be increased appropriately, and the target number is equal to the maximum number of data packets in the current buffer area minus the maximum number of data packets in the buffer area in the previous data transmission, i.e., the target number=send_bit_max n+1 -SEND_bitrate_max n 。
Example 2:
as shown in fig. 4, the present embodiment provides a data transmission method, which is applied to a system, where the system includes a service module and a cloud terminal, and the cloud terminal includes a transmitter and a receiver. The transmitter comprises a video stream buffer, a data processing module, a data packet scheduling module and the like, wherein the data processing module is a newly added module which exchanges data with the original data packet scheduling module of the SRT, and the data packet scheduling module is not listed independently for convenience of description and is integrated into the data processing module. The receiver also has a module such as a receiver buffer set in the SRT protocol, and in this embodiment, the receiver buffer is set to 0, so that it is not necessary to embody the method flow.
The data transmission method comprises the following steps:
s1, a data processing module of a sender reads an INPUT_delay from a service module, the parameter is related to service properties, and the parameter is configured before service is opened.
S2, the data processing module sends a video data packet to the receiver and acquires sending Time Time_data1 and Time_data2 recorded in two adjacent Time stamps.
S3, the data processing module calculates delta time_data.
And S4, the receiver returns the ACK data of the first data packet, namely ACK1.
S5, the data processing module sends ACKACK1 to the receiver.
And S6, the receiver calculates RTT1 according to the ACKACK1 and sends the RTT1 to the data processing module.
S7, the data processing module firstly calculates ONEWAY_delay1 according to ONEWAY_delay=RTT/2, and then calculates the sending delay SEND_delay1 of the current network according to SEND_delay=ONEWAY_delay+delta time_data.
S8, the digital processing module determines that when input_delay > send_delay1 (1+threshold), the maximum number of buffered packets send_bit_max1=input_delay/send_delay 1 in the video stream buffer is set.
S9, the system sends the data packet according to the normal flow of SRT, and performs data caching, AKC, ACKACK, RTT and other parameter interaction.
S10, the data processing module synchronously calculates SEND_delay2 in real time.
S11, the data processing module calculates DeltaSEND_delay according to the change of the SEND_delay, namely DeltaSEND_delay=SEND_delay n+1 -SEND_delay n 。
S12, if the delta SEND_delay is smaller than 0, adjusting the SEND_bit_max2 to be INPUT_delay/SEND_delay2, and indicating the buffer space of the video stream buffer to be increased after the original buffer (SEND_bit_max2-SEND_bit_max1), and filling the newly added data packet according to time; if Δsend_delay >0, adjust send_bit_max2 to input_delay/send_delay2, and instruct the video stream to buffer random delete (send_bit_max2-send_bit_max1) packets in the buffer space of send_bit_max1.
S13, the video stream buffer memory adjusts the buffer memory according to the parameters given by the data processing module.
In the data transmission method provided in embodiments 1-2, whether the maximum transmission delay allowed by the current network meets the service delay threshold of the cloud terminal is determined, if yes, the data packet can be cached at the current transmitting end, the number of the maximum data packets that can be cached by the current network is determined, so that the transmitting end caches the data packet corresponding to the number of the maximum data packets in the current cache region, and the data packet in the cache region is transmitted to the receiver. The number of data packets which can be cached in the current cache region is determined in real time, so that the influence of the current network delay on the service is improved, the SRT can realize a packet loss retransmission mechanism under the condition that the service delay requirement of the cloud terminal is always met, the data transmission quality is ensured, and the self-adaptability of the SRT to the cloud terminal service is finally realized. In particular, the second threshold is set in the maximum transmission delay allowed by the current network, so that the situation that the quality of service is reduced due to the fact that the number of the buffered data packets is adjusted in real time due to small-scale jitter occurring in a short time of the network to influence the discontinuity of the video stream can be prevented. In addition, the mode of randomly deleting the data packets can prevent the condition that the video is interrupted due to deleting continuous data packets.
Example 3:
the embodiment provides a data transmission method applied to a receiver or a decoder, where the receiver or the decoder is disposed on a cloud terminal, the method includes:
step 301, acquiring a transmission delay of a current network and a maximum transmission delay allowed by the current network.
Step 302, determining whether the maximum transmission delay allowed by the current network is smaller than a service delay threshold.
And step 303, in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold, determining the ratio of the service delay threshold to the transmission delay of the current network as the maximum number of buffered data packets in the current buffer.
Step 304, the data packet sent by the sender is received.
And step 305, caching the corresponding number of data packets in the cache area according to the maximum number of the cached data packets.
In this embodiment, only the buffer area of the receiver is adjusted to make the SRT suitable for the cloud terminal service.
Optionally, at step 305: after the corresponding number of data packets are cached in the cache area according to the maximum number of the cached data packets, the data transmission method further comprises the following steps: and adjusting the number of the data packets in the buffer area according to the change trend of the transmission delay of the current network.
Optionally, the adjusting the number of the data packets in the buffer area according to the change trend of the transmission delay of the current network specifically includes: acquiring the difference of transmission delays of two adjacent data transmissions of a current network, wherein the difference of the transmission delays of the two adjacent data transmissions of the current network is equal to the transmission delay of the current network minus the transmission delay of the network in the previous data transmission; judging whether the difference between the transmission time delays of two adjacent data transmission of the current network is larger than a first threshold value or not; and randomly deleting the data packets with the target quantity in the buffer area in response to the difference between the transmission time delays of the adjacent two data transmissions of the current network being larger than a first threshold value.
Optionally, adjusting the number of the data packets in the buffer according to the trend of the transmission delay of the current network further includes: and in response to the difference between the transmission delays of two adjacent data transmissions of the current network being smaller than a first threshold, increasing a target number of data packets in the buffer.
Optionally, the acquiring the transmission delay of the current network specifically includes: receiving a flow data packet sent by a sender to calculate Round Trip Time (RTT), and acquiring a first moment and a second moment corresponding to two adjacent time stamps in a control message; and calculating the transmission time delay of the current network according to the RTT, the first time and the second time.
In this embodiment, since the receiver calculates RTT itself, there is a difference from embodiment 1 in that it is not necessary to return RTT to the sender.
Optionally, calculating the transmission delay of the current network according to the RTT, the first time and the second time, specifically includes: calculating the half value of the RTT to obtain one-way time delay; calculating the difference between the second time and the first time to obtain the difference between the time of the data packets of the adjacent two data transmissions of the current network; and calculating the sum of the one-way time delay and the time difference between the data packets of the adjacent two data transmissions of the current network to obtain the sending time delay of the current network.
Optionally, the obtaining the maximum transmission delay allowed by the current network specifically includes: obtaining the maximum transmission delay allowed by the current network according to the following formula: maximum transmission delay allowed by the current network = transmission delay of the current network + (1 + a second threshold), wherein the second threshold is the maximum allowed threshold.
Example 4:
as shown in fig. 5, the present embodiment provides a data transmission method, which is applied to a system, where the system includes a service module and a cloud terminal, and the cloud terminal includes a transmitter and a receiver. The difference between this embodiment and embodiment 2 is that the data processing module is disposed in the receiver, and the data stream buffer module is also disposed in the receiver. Since the ACKACK sent by the sender can be received in the receiver, the RTT does not need to be embodied in the flow of the data transmission method. While the sender cache is set to 0 for ease of description.
The data transmission method comprises the following steps:
s21, the data processing module of the receiver reads the INPUT_delay from the service module, the parameter is related to the service property, and the parameter is configured before the service is opened.
S22, the sender sends video data packets to a data processing module of the receiver, and the data processing module of the receiver acquires sending Time Time_data1 and Time_data2 recorded in two adjacent Time stamps.
S23, the data processing module calculates delta time_data.
S24, the data processing module returns the ACK data of the first data packet, namely ACK1.
S25, the data processing module receives the ACKACK1 sent by the sender.
S26, the data processing module calculates RTT1 according to the ACKACK1.
S27, the data processing module calculates the view_delay 1 according to view_delay=rtt/2, and then calculates the transmission delay send_delay1 of the current network according to send_delay=view_delay+Δtime_data.
S28, the digital processing module determines that when input_delay > send_delay1 (1+threshold), the maximum number of buffered packets send_bit_max1=input_delay/send_delay 1 in the video stream buffer module is set.
S29, the system sends the data packet according to the normal flow of SRT, and performs data caching, AKC, ACKACK, RTT and other parameter interaction.
S30, the data processing module synchronously calculates SEND_delay2 in real time.
S31, the data processing module calculates Δsend_delay from the change in send_delay, i.e., Δsend_delay=send_delay 2-send_delay1.
S32, if the delta SEND_delay is less than 0, adjusting the SEND_bit_max2 to be INPUT_delay/SEND_delay2, and indicating the buffer space of the video stream buffer to be increased after the original buffer (SEND_bit_max2-SEND_bit_max1), wherein the newly added data packet is filled according to time; if Δsend_delay >0, adjust send_bit_max2 to input_delay/send_delay2, and instruct the video stream to buffer random delete (send_bit_max2-send_bit_max1) packets in the buffer space of send_bit_max1.
S33, the video stream buffer memory module adjusts the buffer memory according to the parameters given by the data processing module.
In the data transmission method provided in embodiment 3-embodiment 4, whether the maximum transmission delay allowed by the current network meets the service delay threshold of the cloud terminal is determined, if yes, the data packet can be cached at the current receiving end, and the number of the maximum data packets that can be cached by the current network is determined, so that the receiving end caches the data packet corresponding to the number of the maximum data packets in the cache region. The number of data packets which can be cached in the current cache region is determined in real time, so that the influence of the current network delay on the service is improved, the SRT can realize a packet loss retransmission mechanism under the condition that the service delay requirement of the cloud terminal is always met, the data transmission quality is ensured, and the self-adaptability of the SRT to the cloud terminal service is finally realized. In particular, the second threshold is set in the maximum transmission delay allowed by the current network, so that the situation that the quality of service is reduced due to the fact that the number of the buffered data packets is adjusted in real time due to small-scale jitter occurring in a short time of the network to influence the discontinuity of the video stream can be prevented. In addition, the mode of randomly deleting the data packets can prevent the condition that the video is interrupted due to deleting continuous data packets.
Example 5:
as shown in fig. 6, the present embodiment provides a data transmission apparatus, applied to a transmitter, including:
the first obtaining module 61 is configured to obtain a transmission delay of the current network and a maximum transmission delay allowed by the current network.
The first judging module 62 is connected to the first obtaining module 61, and is configured to judge whether the maximum transmission delay allowed by the current network is smaller than a service delay threshold.
The first determining module 63 is connected to the first judging module 62, and is configured to determine, in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold, a ratio of the service delay threshold to the transmission delay of the current network as the maximum number of buffered data packets in the current buffer.
The first buffering module 64 is connected to the first determining module 63, and is configured to buffer a corresponding number of data packets in the buffer area of the transmitting end according to the maximum number of buffered data packets.
The transmitting module 65 is connected to the first buffering module 64, and is configured to transmit the data packet in the buffering area to the receiver.
Optionally, the data transmission device further includes: the first adjusting module is connected with the first buffer module and is used for adjusting the number of the data packets in the buffer area according to the change trend of the transmission delay of the current network.
Optionally, the first adjustment module is specifically configured to obtain a difference between transmission delays of two adjacent data transmissions of the current network, where the difference between the transmission delays of the two adjacent data transmissions of the current network is equal to the transmission delay of the current network minus the transmission delay of the network when the previous data transmission is performed; the method is also used for judging whether the difference between the transmission delays of two adjacent data transmission of the current network is larger than a first threshold value; and the data packets with the target quantity in the buffer area are deleted randomly in response to the difference of the transmission time delays of the adjacent two data transmission of the current network being larger than a first threshold value.
Optionally, the first adjustment module is further configured to increase the target number of data packets in the buffer in response to a difference between transmission delays of two adjacent data transmissions of the current network being less than a first threshold.
Optionally, the first acquisition module includes a first acquisition unit and a first calculation unit.
A first obtaining unit, configured to send a traffic data packet to a receiver, so that the receiver returns a round trip time RTT to the sender according to the traffic data packet; and simultaneously, acquiring a first moment and a second moment corresponding to two adjacent time stamps in the control message.
The first calculating unit is connected with the first obtaining unit and is used for calculating the sending time delay of the current network according to the RTT, the first time and the second time.
Optionally, the first calculating unit is specifically configured to calculate a half value of the RTT to obtain a unidirectional delay, and calculate a difference between the second time and the first time to obtain a difference between packet times of two adjacent data transmissions of the current network; and the sum of the one-way time delay and the time difference between the data packets of the adjacent two data transmissions of the current network is calculated to obtain the sending time delay of the current network.
Optionally, the first obtaining unit is further configured to obtain a maximum transmission delay allowed by the current network according to the following formula: maximum transmission delay allowed by the current network = transmission delay of the current network + (1 + a second threshold), wherein the second threshold is the maximum allowed threshold.
Example 6:
as shown in fig. 7, the present embodiment provides a data transmission device, which is applied to a receiver, and includes:
the second obtaining module 71 is configured to obtain a transmission delay of the current network and a maximum transmission delay allowed by the current network.
And the second judging module 72 is connected to the second obtaining module 71, and is configured to judge whether the maximum transmission delay allowed by the current network is smaller than a service delay threshold.
And the second determining module 73 is connected to the second judging module 72, and is configured to determine, in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold, a ratio of the service delay threshold to the transmission delay of the current network as the maximum number of buffered data packets in the current buffer.
A receiving module 74, configured to receive the data packet sent by the sender.
And the second buffer module 75 is connected to the receiving module 74 and the second determining module 73, and is configured to buffer a corresponding number of data packets in the buffer according to the maximum number of buffered data packets.
Optionally, the data transmission device further includes: and a second adjustment module.
And the second adjusting module is connected with the second buffer module and is used for adjusting the number of the data packets in the buffer area according to the change trend of the transmission delay of the current network.
Optionally, the second adjustment module is specifically configured to obtain a difference between transmission delays of two adjacent data transmissions of the current network, where the difference between the transmission delays of the two adjacent data transmissions of the current network is equal to the transmission delay of the current network minus the transmission delay of the network when the previous data transmission is performed; the method is also used for judging whether the difference between the transmission delays of two adjacent data transmission of the current network is larger than a first threshold value; and the data packets with the target quantity in the buffer area are deleted randomly in response to the difference of the transmission time delays of the adjacent two data transmission of the current network being larger than a first threshold value.
Optionally, the second adjustment module is further configured to increase the target number of data packets in the buffer in response to a difference between transmission delays of two adjacent data transmissions of the current network being less than a first threshold.
Optionally, the second acquisition module includes a second acquisition unit and a second calculation unit.
A second obtaining unit, configured to receive a traffic packet sent by the sender and calculate a round trip time RTT; and the method is used for acquiring a first moment and a second moment corresponding to two adjacent time stamps in the control message.
And the second calculation unit is connected with the second acquisition unit and is used for calculating the transmission delay of the current network according to the RTT, the first moment and the second moment.
Optionally, the second calculating unit is specifically configured to calculate a half value of the RTT to obtain a unidirectional delay, and calculate a difference between the second time and the first time to obtain a difference between packet times of two adjacent data transmissions of the current network; and the sum of the one-way time delay and the time difference between the data packets of the adjacent two data transmissions of the current network is calculated to obtain the sending time delay of the current network.
Optionally, the second obtaining unit is further configured to obtain a maximum transmission delay allowed by the current network according to the following formula: maximum transmission delay allowed by the current network = transmission delay of the current network + (1 + a second threshold), wherein the second threshold is the maximum allowed threshold.
Example 7:
as shown in fig. 8, the present embodiment provides a transmitter including a memory 81 and a processor 82, the memory 81 storing a computer program, the processor 82 being configured to run the computer program to implement the data transmission method as described in embodiment 1.
Example 8:
the present embodiment provides a receiver comprising a memory having a computer program stored therein and a processor arranged to run the computer program to implement the data transmission method as described in embodiment 3.
The data transmission device provided in embodiment 5-embodiment 6, the transmitter provided in embodiment 7, and the receiver provided in embodiment 8 improve the impact of network latency on traffic by adding a data processing module to the SRT transmitter or receiver for confirming whether the real-time latency of the current network matches the latency required by the traffic, and for adjusting the buffering in the transmitter or receiver; by increasing the maximum allowable threshold for the algorithm for adjustment of the buffering in the SRT sender/receiver, modifications to the buffering due to small-scale jitter occurring in the short time of the network can be prevented from affecting the discontinuity of the video stream. In addition, for the situation that the buffer memory needs to be reduced, a mode of randomly deleting the data packets is adopted, so that the situation that video is interrupted due to deleting continuous data packets can be prevented.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (12)
1. A data transmission method, applied to a transmitter, the method comprising:
acquiring the transmission delay of the current network and the maximum transmission delay allowed by the current network;
judging whether the maximum transmission time delay allowed by the current network is smaller than a service time delay threshold value or not;
determining the ratio of the service delay threshold to the transmission delay of the current network as the maximum number of the buffered data packets of the current buffer area in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold;
caching the corresponding data packets in a cache area of a transmitting end according to the maximum cached data packet quantity;
and sending the data packet of the buffer area to a receiver.
2. The data transmission method according to claim 1, further comprising, after said transmitting the data packet of the buffer to the receiver:
And adjusting the number of the data packets in the buffer area according to the change trend of the transmission delay of the current network.
3. The data transmission method according to claim 2, wherein the adjusting the number of data packets in the buffer according to the trend of the transmission delay of the current network specifically includes:
acquiring the difference of transmission delays of two adjacent data transmissions of a current network, wherein the difference of the transmission delays of the two adjacent data transmissions of the current network is equal to the transmission delay of the current network minus the transmission delay of the network in the previous data transmission;
judging whether the difference between the transmission time delays of two adjacent data transmission of the current network is larger than a first threshold value or not;
and randomly deleting the data packets with the target number in the buffer area in response to the difference between the transmission delays of the adjacent two data transmissions of the current network being greater than a first threshold.
4. The data transmission method according to claim 3, wherein the adjusting the number of data packets in the buffer according to the trend of the transmission delay of the current network further comprises:
and increasing the target number of data packets in the buffer area in response to the difference between the transmission delays of two adjacent data transmissions of the current network being smaller than a first threshold.
5. The method for transmitting data according to claim 1, wherein the obtaining the transmission delay of the current network specifically includes:
transmitting a flow data packet to a receiver so that the receiver returns a Round Trip Time (RTT) to the transmitter according to the flow data packet; simultaneously, acquiring a first moment and a second moment corresponding to two adjacent time stamps in a control message;
and calculating the transmission time delay of the current network according to the RTT, the first time and the second time.
6. The method for data transmission according to claim 5, wherein calculating the transmission delay of the current network according to the RTT, the first time and the second time specifically includes:
calculating the half value of the RTT to obtain one-way time delay;
calculating the difference between the second time and the first time to obtain the difference between the time of the data packets of the adjacent two data transmissions of the current network;
and calculating the sum of the one-way time delay and the time difference between the data packets of the adjacent two data transmissions of the current network to obtain the sending time delay of the current network.
7. The method for data transmission according to claim 1, wherein the obtaining the maximum transmission delay allowed by the current network specifically includes:
Obtaining the maximum transmission delay allowed by the current network according to the following formula:
maximum transmission delay allowed by the current network = transmission delay of the current network + (1 + a second threshold), wherein the second threshold is the maximum allowed threshold.
8. A data transmission method for use in a receiver, the method comprising:
acquiring the transmission delay of the current network and the maximum transmission delay allowed by the current network;
judging whether the maximum transmission time delay allowed by the current network is smaller than a service time delay threshold value or not;
determining the ratio of the service delay threshold to the transmission delay of the current network as the maximum number of the buffered data packets of the current buffer area in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold;
receiving a data packet sent by a sender;
and caching the data packets with corresponding quantity in a cache area according to the maximum cached data packet quantity.
9. A data transmission device, characterized by being applied to a transmitter, comprising:
a first acquisition module for acquiring the transmission delay of the current network and the maximum transmission delay allowed by the current network,
a first judging module connected with the first obtaining module for judging whether the maximum transmission time delay allowed by the current network is smaller than a service time delay threshold,
A first determining module, connected to the first judging module, configured to determine, in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold, a ratio of the service delay threshold to the transmission delay of the current network as a maximum number of buffered data packets in the current buffer,
a first buffer module connected with the first determining module and used for buffering the data packets with corresponding quantity in the buffer area of the transmitting end according to the quantity of the maximum buffered data packets,
and the sending module is connected with the first buffer module and is used for sending the data packet of the buffer area to the receiver.
10. A data transmission device for use in a receiver, comprising:
a second acquisition module for acquiring the transmission delay of the current network and the maximum transmission delay allowed by the current network,
a second judging module connected with the second obtaining module for judging whether the maximum transmission time delay allowed by the current network is smaller than a service time delay threshold,
a second determining module, connected to the second judging module, configured to determine, in response to the maximum transmission delay allowed by the current network being smaller than the service delay threshold, a ratio of the service delay threshold to the transmission delay of the current network as a maximum number of buffered data packets in the current buffer,
A receiving module for receiving the data packet sent by the sender,
the second buffer module is connected with the receiving module and the second determining module and is used for buffering the data packets with corresponding quantity in the buffer area according to the quantity of the maximum buffered data packets.
11. A transmitter comprising a memory and a processor, the memory having stored therein a computer program, the processor being arranged to run the computer program to implement the data transmission method of any of claims 1-7.
12. A receiver comprising a memory in which a computer program is stored and a processor arranged to run the computer program to implement the data transmission method of claim 8.
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