CN114979023A - Data transmission method, system, electronic equipment and storage medium - Google Patents
Data transmission method, system, electronic equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/6215—Individual queue per QOS, rate or priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/72—Admission control; Resource allocation using reservation actions during connection setup
- H04L47/722—Admission control; Resource allocation using reservation actions during connection setup at the destination endpoint, e.g. reservation of terminal resources or buffer space
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a data transmission method, a system, an electronic device and a storage medium, wherein the method comprises the following steps: at a sending end, acquiring data to be transmitted and setting a data priority identification according to the data type so as to divide the data into data with different priorities; caching data with different priorities to corresponding buffer queues; based on the data priority mark, sequentially sending the data with different priorities in the buffer queue; and at the receiving end, acquiring the transmission data, and decoding and playing the cached transmission data based on the data type of the transmission data and the data priority identification of the transmission data. By the method, the corresponding data priority identification can be set according to the data type, so that the set data type is transmitted preferentially when the network fluctuates, and the condition of time delay or interruption is avoided.
Description
Technical Field
The present application relates to the field of network transmission technologies, and in particular, to a data transmission method, a data transmission system, an electronic device, and a storage medium.
Background
With the gradual maturity and popularization of wireless network technology, people have higher and higher requirements for streaming media in a wireless network, and in occasions with higher real-time requirements, such as video chat, the problems of discontinuous sound, blocked images and the like can be caused by the congestion condition of the wireless network.
In the research and practice process of the prior art, the inventor of the present application finds that, with the popularity of wireless networks, the requirement on real-time performance is higher and higher, and the technical solutions for improving the transmission quality of wireless streaming media in the prior art mainly include: firstly, carrying out self-adaptive adjustment on audio and video transmission code streams according to the bandwidth condition of a wireless network; dividing the streaming media data into an audio queue and a video queue at an application layer, and sequentially transmitting the audio queue and the video queue; however, the first scheme does not solve the problem that limited and preferential transmission of audio is not achieved, and when the second scheme transmits the buffered read data, audio data does not have priority, and under the condition that a wireless network fluctuates, the problems of sound delay, even sound interruption and the like occur.
Disclosure of Invention
The technical problem mainly solved by the application is to provide a data transmission method, a data transmission system, an electronic device and a storage medium, which can set a data priority identifier through a data type, cache data to a corresponding buffer queue according to the data priority identifier, and sequentially transmit data with different priorities in the buffer queue through the data priority identifier, so that the data to be transmitted are sequentially transmitted according to the data priority identifier under the condition of network congestion, and the problems of sound interruption and the like are solved.
In order to solve the technical problem, the application adopts a technical scheme that: a data transmission method is provided and applied to a sending end, and the method comprises the following steps: acquiring data to be transmitted and setting a data priority identifier according to the data type so as to divide the data into data with different priorities; caching the data with different priorities to corresponding buffer queues; and sequentially sending the data with different priorities in the buffer queue based on the data priority identification.
In an embodiment of the present application, the obtaining data to be transmitted and setting a data priority identifier according to a data type to divide the data into different priority data includes: acquiring signaling data, audio data and video data in data to be transmitted, setting a data priority identifier of the signaling data as a first priority, setting a data priority identifier of the audio data as a second priority, and setting a data priority identifier of the video data as a third priority; wherein the priority levels of the first priority to the third priority are sequentially decreased.
In an embodiment of the present application, the buffering the data with different priorities to corresponding buffer queues includes: and respectively caching the data with different priorities to corresponding buffer queues according to the data priority identifications, wherein the signaling data with the first priority are cached to the signaling buffer queues, the audio data with the second priority are cached to the audio buffer queues, and the video data with the third priority are cached to the video buffer queues.
In an embodiment of the present application, after obtaining data to be transmitted and setting a data priority identifier according to a data type to divide the data into data with different priorities, the data transmission method further includes: acquiring the data length of data to be transmitted; acquiring the residual space of the buffer queue corresponding to the data priority identification; and if the residual space is less than 0, returning, and if the residual space is greater than 0, caching the data to be transmitted into a corresponding buffer queue according to the minimum value between the data length and the residual space.
In an embodiment of the present application, the sequentially sending data with different priorities in the buffer queue based on the data priority identifier includes: sequentially inquiring whether data are to be sent in a sending buffer queue or not according to the data priority identification, and if the data are to be sent, acquiring the data in the sending buffer queue; if no data is to be sent, inquiring whether data is to be sent in the next sending buffer queue or not, and finishing the inquiry of all sending buffer queues; and adding head information corresponding to the data priority identification to the inquired and obtained data to form a data packet, and sequentially sending the data packet based on the head information.
In an embodiment of the present application, the adding, to the data obtained by query, header information corresponding to a data priority identifier, and sequentially sending the data based on the header information includes: adding header information to the data acquired by query, and packaging the data into a data packet; wherein, the header information comprises a data packet sequence number and a data priority identification; obtaining the size of a congestion window and the size of data which is sent but not confirmed by an opposite terminal and comparing the sizes; if the congestion window is smaller than or equal to the size of the data which is not confirmed by the opposite end, the data can not be sent; and if the congestion window is larger than the size of the data which is not confirmed by the opposite end, sequentially sending the data packets in each buffer queue according to the data packet sequence number, the data priority identification and the size of the congestion window.
In an embodiment of the present application, before querying the transmission buffer queue, the method further includes: acquiring a sending packet loss list and judging whether the sending packet loss list is empty or not; if the transmission packet loss list is empty, entering transmission buffer queue query; and if the transmission packet loss list is not empty, acquiring the data packet with the highest priority in the current transmission packet loss list, and further packaging the data packet for transmission.
In order to solve the above technical problem, another technical solution adopted by the present application is: a data transmission method is provided and applied to a receiving end, and the method comprises the following steps: receiving and analyzing transmission data, and acquiring a data priority identifier and a data type of the transmission data; caching the received transmission data according to the data priority identification and the data type of the transmission data; and decoding and playing the buffered transmission data.
In an embodiment of the present application, the receiving and analyzing the transmission data to obtain the data priority identifier and the data type of the transmission data includes: receiving a data packet in transmission data, analyzing the data packet, and acquiring a data priority identifier, a data packet sequence number, a data type and data integrity of the data packet; reading the content of the control message for the analyzed control message, if the content of the control message is NACK, setting a packet loss sending list, and otherwise, setting congestion control information; for the analyzed data message, acquiring a priority identification and a message serial number of the data message; wherein, the message sequence number corresponds to the data packet sequence number.
In an embodiment of the present application, the respectively caching the received transmission data according to the data priority identifier and the data type of the transmission data includes: and judging whether the data packets in the transmission data are continuous or not based on the priority identification, the data type, the data packet sequence number and the data integrity of the transmission data, if so, storing the data packets into a cache, and if not, storing the data packets into a packet loss receiving list.
In an embodiment of the application, the determining, based on the priority identifier of the transmission data, the data type, the sequence number of the data packet, and the data integrity, whether the data packet in the transmission data is continuous or not, if the data packet is continuous, storing the data packet in a cache, and if the data packet is discontinuous, storing the data packet in a packet loss receiving list includes: if the message serial numbers are continuous, storing the data messages into a buffer queue corresponding to the data priority identification, updating the readable buffer position, if the message serial numbers are discontinuous, judging whether the data messages are retransmission packets according to the message serial numbers, if the data packets are the retransmission packets, deleting the message serial numbers from a received packet loss list, if the data packets are not the retransmission packets, adding the discontinuous message serial numbers into the received packet loss list, and periodically returning the received packet loss list to the sending end.
In an embodiment of the application, after the step of determining whether the data packet is a retransmission packet is completed, the method further includes: judging whether a feedback period in the received packet loss list is due or not, and setting a first notification event identifier when the feedback period in the received packet loss list is due; after the step of updating the buffer readable location is completed, the method further comprises: judging whether the feedback period of the receiving rate information is due or not, and setting a second notification event identifier when the feedback period of the receiving rate information is due; and judging whether the first notification event identifier and the second notification event identifier have set positions or not, if so, packaging feedback data according to the set position identifiers, calling a UDP interface to send the feedback data, and if not, ending the operation.
In order to solve the above technical problem, the present application adopts another technical solution that: providing a data transmission system, wherein the data transmission system comprises a first data transmission device and a second data transmission device; wherein the first data transmission apparatus transmits data by the data transmission method applied to the transmitting end as described above, and the second data transmission apparatus receives data by the data transmission method applied to the receiving end as described above.
In order to solve the above technical problem, the present application adopts another technical solution: there is provided an electronic device comprising a memory and a processor coupled to the memory, the memory storing at least one computer program which, when loaded and executed by the processor, is adapted to implement the data transmission method as described above.
In order to solve the above technical problem, the present application adopts another technical solution: there is provided a computer readable storage medium storing at least one program which, when loaded and executed by a processor, is adapted to carry out the data transmission method described above.
Different from the prior art, the data transmission method provided by the application comprises the following steps: applied to a transmitting end, the method comprises the following steps: acquiring data to be transmitted and setting a data priority identifier according to the data type so as to divide the data into data with different priorities; caching data with different priorities to corresponding buffer queues; and sequentially sending the data with different priorities in the buffer queue based on the data priority identification. And applied to a receiving end, the method comprising: receiving and analyzing the transmission data, and acquiring a data priority identifier and a data type of the transmission data; caching the received transmission data according to the data priority identification and the data type of the transmission data; and decoding and playing the buffered transmission data. The data to be transmitted is set with the data priority identification according to the data type and cached to the buffer queue, and the data with different priorities in the buffer queue is sequentially sent based on the data priority identification, so that the problems of audio delay or sound interruption under the condition of network congestion are solved, and the data transmission efficiency is improved.
Drawings
Fig. 1 is a schematic flowchart of an embodiment of a data transmission method applied to a transmitting end according to the present invention;
FIG. 2 is a flowchart illustrating an embodiment of step S1;
FIG. 3 is a flowchart illustrating a step S1 according to a later embodiment of the present invention;
FIG. 4 is a flow chart illustrating a prior embodiment of a transmit buffer queue lookup according to the present invention;
FIG. 5 is a flowchart illustrating an embodiment of step S3;
FIG. 6 is a flowchart illustrating an embodiment of step S33;
FIG. 7 is a flowchart illustrating an embodiment of a data transmission method applied to a receiving end according to the present invention;
FIG. 8 is a flowchart illustrating an embodiment of step T1;
FIG. 9 is a flowchart illustrating an embodiment of step T2;
FIG. 10 is a block diagram of an embodiment of a data transmission system according to the present invention;
FIG. 11 is a schematic structural diagram of an embodiment of an electronic device according to the invention;
FIG. 12 is a schematic structural diagram of an embodiment of a computer-readable storage medium of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be noted that the following examples are only illustrative of the present invention, and do not limit the scope of the present invention. Likewise, the following examples are only some examples, not all examples, and all other examples obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The traditional streaming media data transmission methods mainly comprise three methods, one is that a TCP protocol is adopted, and the defect is that when network fluctuation packet loss occurs, the window of the TCP protocol is reduced, so that the transmission rate is reduced, data are accumulated in the transmission buffer of the TCP, real-time audio and video delay is increased, and even the situation of audio and video blocking occurs. And the UDP protocol is adopted, and the defect is that real-time audio and video blocking can be caused when packet loss occurs due to network fluctuation, so that the method is only suitable for a local area network environment without packet loss. Thirdly, retransmission, congestion control and the like are added on the UDP protocol to realize reliable transmission, but the technical scheme is more complex. Therefore, the technical problems of the streaming media transmission method currently exist are: when the streaming media data are accumulated in a transmission buffer queue due to network fluctuation, packet loss, congestion and the like, the video data packet is sent before the audio data packet, so that the video data packet is sent first and then the audio data packet is sent; thereby increasing the audio delay and causing the problem of sound discontinuity in severe cases.
In the research of the applicant, it is found that, for the case that audio delay and even sound interruption occur when streaming media data transmission is accumulated in a buffer queue due to network fluctuation and the like, if data in the buffer queue is set to be transmitted according to a set priority identifier, the problem of audio delay and even sound interruption caused by the prior transmission of video data can be avoided.
Therefore, a new data transmission method is provided, wherein pain sensation obtains data to be transmitted and sets a data priority identifier according to the data type so as to divide the data into data with different priorities; caching data with different priorities to corresponding buffer queues; and sending the data with different priorities in the buffer queue in sequence based on the data priority identification so as to realize that the data in the buffer queue is transmitted in sequence according to the priority identification.
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a data transmission method applied to a transmitting end according to an embodiment of the present invention; it should be noted that, if the result is substantially the same, the method of the present invention is not limited to the flow sequence shown in fig. 1, and as shown in fig. 1, the method applied to the transmitting end includes the following steps:
s1, acquiring data to be transmitted and setting data priority identification according to data types so as to divide the data into data with different priorities;
the data to be transmitted is data waiting to be sent out, namely data which needs to be transmitted from one place to another place; the data type is a set of values and attributes defining this set to inform people how to use the data; the priority mark is an identification symbol of a queuing grade, which is a set convention, wherein the priority mark is processed firstly with high priority and processed later with low priority;
referring to fig. 2, fig. 2 is a schematic flowchart of step S1 according to an embodiment of the present invention, and step S1 includes:
s11, acquiring signaling data, audio data and video data in the data to be transmitted;
the signaling data is related data of a control instruction in the communication system and is used for guiding the terminals, the switching system and the transmission system to cooperatively operate, establishing a communication channel among the specified terminals and maintaining the normal operation of the network; the audio data is digitized sound data, and continuous analog audio signals are subjected to analog-to-digital conversion (ADC) through a certain frequency to obtain the audio data, digital-to-analog conversion (DAC) analog audio signal output is required to be carried out on the audio data during playing, and important indexes of digitized sound are sampling frequency and sampling size; video data is a continuous image sequence which is essentially composed of a group of continuous images and has huge data volume;
specifically, data to be transmitted is acquired, and signaling data composed of control instruction related data, audio data composed of digitized sound and video data composed of continuous image sequences in the transmission process of the data are acquired.
In some embodiments, the data to be transmitted may be streaming media data, and since the streaming media data is a technology and a process of compressing a series of media data, sending the data by segments on the internet, and transmitting video and audio on the internet in real time for viewing.
In some embodiments, the data to be transmitted may be other digital media, which refers to an information carrier that records, processes, propagates, or acquires the data in the form of binary numbers. These carriers include sensory media such as digitized text, graphics, images, sounds, video images, and animations, presentation media (codes) etc. representing these sensory media, which are generally referred to as logical media, and physical media for storing, transmitting, and displaying the logical media; among them, digital media can be divided into Still media (Still media) and continuous media (Continues media) if classified by time attribute. Still media refers to digital media, such as text and pictures, whose content does not change over time. And continuous media refers to digital media whose content changes over time, such as audio, video, virtual images, etc. According to the source attribute, the media can be divided into Natural media (Natural media) and Synthetic media (Synthetic media). The natural media refer to scenes, sounds and the like existing in the objective world, and are digital media obtained by digitalizing and encoding through special equipment, such as photos taken by a digital camera, images taken by a digital video camera, MP3 digital music, digital movie and television and the like. The synthesized media refers to text, music, voice, images, animation, etc. generated (synthesized) by a computer, such as an animated character produced by 3D production software, expressed by a specific symbol, language or algorithm using the computer as a tool. If the components are divided according to the constituent elements, the components can be divided into Single media (Single media) and multimedia (Multi media). As the name implies, a single medium refers to a carrier consisting of a single information carrier; multimedia (Multimedia) refers to the presentation and delivery of various information carriers.
S12, setting the data priority mark of the signaling data as a first priority, setting the data priority mark of the audio data as a second priority, and setting the data priority mark of the video data as a third priority; wherein the priority levels of the first priority to the third priority are sequentially decreased.
The priority mark is set according to the data type, and therefore, the priority mark is set as the data priority mark.
In some embodiments, corresponding signaling data, audio data and video data are extracted from data to be transmitted according to data types, and data priority identifiers are set according to quantity types, wherein the signaling data is of a first priority, the audio data is of a second priority, the video data is of a third priority, and priority levels of the signaling data, the audio data and the video data are set to be sequentially decreased.
Referring to fig. 3, fig. 3 is a schematic flowchart of an embodiment of the invention after step S1, where the data transmission method further includes:
s13, acquiring the data length L of the data to be transmitted;
the data length refers to the length of data transmitted or stored in a computer, and generally used units are bytes, for example, one letter is one byte, and one Chinese character is two bytes.
In some embodiments, the data to be transmitted is obtained, and the data priority identification of the data and the data length of the data, for example, the signaling data, the audio data, the video data and their respective corresponding data priority identifications and the data length L of the respective data are obtained.
S14, obtaining the residual space m of the buffer queue corresponding to the data priority identification;
the buffer queue is a buffer queue set by a buffer zone corresponding to a data type and used for buffering corresponding to-be-transmitted data according to the data type, and each buffer queue has a corresponding space, so that the residual space m of the buffer queue needs to be acquired for subsequent operation.
In some embodiments, the size of the remaining space of the buffer queue corresponding to the signaling data of the first priority, the size of the remaining space of the buffer queue corresponding to the audio data of the second priority, and the size of the remaining space of the buffer queue corresponding to the video data of the third priority are sequentially obtained.
And S15, if the residual space m is smaller than 0, returning, and if the residual space m is larger than 0, caching the data to be transmitted into the corresponding buffer queue according to the minimum value n between the data length L and the residual space m.
The minimum value between the data length and the residual space is the comparison between the data length and the residual space, the minimum value between the data length and the residual space is taken, and data is cached according to the minimum value.
In some embodiments, the size of the space of the buffer queue is sequentially judged, if the remaining space of a certain buffer queue is less than 0, it is indicated that the buffer queue has no space, the data of the buffer queue is directly returned, and then the next buffer queue is judged; if the residual space of a certain buffer queue is larger than 0, the buffer queue has space, and then the data length of the data type corresponding to the buffer queue is compared with the residual space of the buffer queue, and the minimum value n in the data length and the residual space is used for caching n bytes in the data type into the corresponding buffer queue.
S2, caching data with different priorities to corresponding buffer queues;
the data with different priorities comprises signaling data corresponding to a first priority, audio data corresponding to a second priority and video data corresponding to a third priority.
In some embodiments, the signaling data corresponding to the first priority is buffered in the signaling buffer queue, the audio data corresponding to the second priority is buffered in the audio buffer queue, and the video data corresponding to the third priority is buffered in the video buffer queue.
In some embodiments, the signaling buffer queue may be set as a first buffer queue according to the data priority identifier of the signaling data, the audio buffer queue may be set as a second buffer queue according to the data priority identifier of the audio data, and the video buffer queue may be set as a third buffer queue according to the data priority identifier of the video data, wherein the priority levels of the first buffer queue to the third buffer queue decrease sequentially.
And S3, sequentially sending the data with different priorities in the buffer queue based on the data priority identification.
The data priority marks are set according to data types and comprise signaling data corresponding to a first priority, audio data corresponding to a second priority and video data corresponding to a third priority, and each priority data is cached in a corresponding buffer queue according to the data priority marks and different priority data are sequentially sent according to the data priority marks.
Referring to fig. 4, fig. 4 is a schematic flowchart of a previous embodiment of performing a query on a send buffer queue according to the present invention, specifically:
s311, acquiring a sending packet loss list and judging whether the sending packet loss list is empty or not;
the packet loss sending list is a packet loss sending list which is set by the packet loss sending list, wherein the packet loss sending list is caused by the fact that the packet sending rate exceeds the packet sending rate, so that no residual space exists in a sending buffer queue, and packet loss is caused;
in some embodiments, in the sending process, if the remaining space m of the buffer queue is less than 0 and a data packet returns, a sending packet loss list is formed, the sending packet loss list is obtained, and whether the sending packet loss list has a data packet is checked.
S312, if the transmission packet loss list is empty, entering transmission buffer queue query;
in some embodiments, if the transmission packet loss list is empty, that is, the remaining space m of the buffer queue is greater than 0, and no packet loss occurs, the transmission packet loss list is empty, and the transmission buffer queue query is directly entered.
And S313, if the transmission packet loss list is not empty, acquiring a data packet with the highest priority in the current transmission packet loss list, and further packaging the data packet for transmission.
In some embodiments, if the transmission packet loss list is not empty, that is, the remaining space m of the buffer queue is less than 0, the buffer queue is full, and there is no remaining space, so that packet loss occurs, the packet loss data packet is collected in the transmission packet loss list, the data packet with the highest priority in the current transmission packet loss list is obtained, and the data packet is directly encapsulated for transmission.
Referring to fig. 5, fig. 5 is a schematic flowchart of step S3 according to an embodiment of the present invention, and step S3 includes:
s32, sequentially inquiring whether data are to be sent in the sending buffer queue according to the data priority identification, and if the data are to be sent, acquiring the data in the sending buffer queue; if no data is to be sent, inquiring whether data is to be sent in the next sending buffer queue or not, and finishing the inquiry of all sending buffer queues;
the buffer queue query is to query the data contained in the buffer queue, and to perform subsequent processing on the data in the buffer queue according to the query result;
in some embodiments, whether signaling data are to be sent in a buffer queue corresponding to the signaling data of the first priority is inquired, if so, the signaling data in the buffer queue are acquired to form a first priority data packet, and the next step is carried out; if the first priority data packet does not exist, inquiring whether a buffer queue corresponding to the audio data of the second priority has audio data to be sent, if so, acquiring the audio data in the buffer queue to form a second priority data packet, and entering the next step; if the second priority data packet does not exist, inquiring whether video data to be sent exist in a buffer queue corresponding to the video data of the third priority, if so, acquiring the video data in the buffer queue to form the third priority data packet, and entering the next step; if there is no third priority data packet, the transmission scheduling process is finished.
In some embodiments, the buffer queue corresponding to the signaling data of the first priority may be set as a first priority queue, the buffer queue corresponding to the audio data of the second priority may be set as a second priority queue, and the buffer queue corresponding to the video data of the third priority may be set as a third priority queue; if so, inquiring whether the first priority queue has data to be sent, if so, acquiring the data as a first priority data packet, and entering the next step; if the first priority data packet does not exist, inquiring whether data to be sent exists in a second priority queue, if the data to be sent exists, acquiring the data as the second priority data packet, and entering the next step; if no second priority data packet exists, inquiring whether the third priority queue has data to be sent, if so, acquiring the data as the third priority data packet, and entering the next step; and if no data is to be sent, ending the sending scheduling process.
S33, adding header information corresponding to the data priority identification to the inquired and obtained data to form a data packet, and sending the data packet in sequence based on the header information;
the data obtained by the query may be a first priority data packet, a second priority data packet, or a third priority data packet, that is, only the data packet with the highest priority in the query is obtained in each query, and header information corresponding to the data priority identifier is added to the data packet.
Specifically, for a packet to which header information such as a packet sequence number and a data priority identifier is added, the encapsulated packet is sent by calling a UDP interface.
Referring to fig. 6, fig. 6 is a schematic flowchart of step S33 according to an embodiment of the present invention, and step S33 includes:
s331, adding header information to the data acquired by query, and packaging the data into a data packet; wherein, the header information comprises a data packet sequence number and a data priority identification;
in some embodiments, the data obtained by the query is encapsulated into a data packet, and a data packet sequence number and a data priority identifier are added to the data packet; for example, the query obtains audio data, encapsulates the audio data into an audio data packet, and adds the sequence number of the audio data packet and the data priority identifier corresponding to the audio data packet.
Alternatively, the packet sequence number may be indexed according to the sequence of the acquired data, for example, five audio data packets are acquired, the packet sequence number is set according to the acquired sequence, the packet sequence number of the first acquired audio data packet is 1, the packet sequence number of the fifth acquired audio data packet is 5, and subsequent transmission is performed based on the data priority identifier and the packet sequence number.
S332, obtaining and comparing the size of the congestion window and the size of the data which is sent but not confirmed by the opposite terminal;
if the congestion window is smaller than or equal to the size of the data which is not confirmed by the opposite end, the data can not be sent;
and if the congestion window is larger than the size of the data which is not confirmed by the opposite end, sequentially sending the data packets in each buffer queue according to the sequence number of the data packets, the data priority identification and the size of the congestion window.
The congestion window is a measure for preventing communication congestion in the internet by satellite communication, and a mechanism combining a congestion avoidance algorithm and a slow start algorithm is adopted at the transmitting end. The "congestion window" is a window for "congestion avoidance" and is a slidable window installed at the transmitting end, and the size of the window is a window that does not exceed the acknowledgement notification of the receiving end. The slow start is that after the connection is established, the window is controlled to increase by a segment value every time an acknowledgement from the receiving end is received, and when the window value reaches the limit value of the slow start, the slow start stops working, so that the network congestion is avoided.
The size of the congestion window depends on the congestion level of the network and is dynamically changing. The sender has its own send window equal to the congestion window. The send window may also be smaller than the congestion window if the receiving capability of the receiver is reconsidered. The principle of controlling the congestion window by the sender is as follows: as long as the network is not congested, the congestion window is increased by some more to send more packets out. But as soon as the network is congested the congestion window is reduced a little to reduce the number of packets injected into the network.
Referring to fig. 7, fig. 7 is a flowchart illustrating a data transmission method applied to a receiving end according to an embodiment of the present invention; it should be noted that, if the result is substantially the same, the method of the present invention is not limited to the flow sequence shown in fig. 1, and as shown in fig. 7, the method applied to the receiving end includes the following steps:
t1, receiving and analyzing the transmission data, and acquiring the data priority identification and the data type of the transmission data;
the transmission data is data transmitted based on a transmitting end.
Referring to fig. 8, fig. 8 is a schematic flowchart of an embodiment of step T1 of the present invention, where step T1 includes:
t11, receiving a data packet in the transmission data, and analyzing the data packet;
the transmission data is data transmitted based on a transmitting end; the data packet is formed by encapsulating data transmitted by a transmitting end.
In some embodiments, the data packets may include signaling packets, audio packets, video packets, etc., or other data packets that are obtained as the case may be.
In some embodiments, the data packet is parsed to obtain a control packet and a data packet, where the control packet includes signaling data, and the data packet includes audio data and video data.
T12, acquiring data priority identification, data packet sequence number, data type and data integrity of the data packet;
the data priority identification of the data packet is the data priority identification corresponding to the data to be transmitted, and the data packet sequence number is the data packet sequence number contained in the header information of the data to be transmitted; data Integrity (Data Integrity) refers to the accuracy and reliability of Data, which is classified into four categories: entity Integrity (Entity Integrity), Domain Integrity (Domain Integrity), Referential Integrity (Referential Integrity), User-defined Integrity (User-defined Integrity), Domain Integrity: means the input validity of a column, whether null is allowed; entity integrity: meaning that all rows in the table are guaranteed to be unique. Entity integrity requires that all rows in the table have a unique identifier. This unique identifier may be a column or a combination of several columns, called a primary key. That is, the primary key in the table must take a unique value on all rows. Integrity of reference: refers to ensuring a reference relationship between a primary key (referenced table) and an external key (referenced table). It relates to the maintenance of consistency of two or more table data.
In some embodiments, for the analyzed control message, reading the content of the control message, if the content of the control message is NACK, setting a packet loss sending list, otherwise, setting congestion control information; for the analyzed data message, acquiring a priority identification and a message serial number of the data message; wherein, the message sequence number corresponds to the data packet sequence number.
Wherein, NACK-Negative acknowledgement is Negative acknowledgement.
T2, buffering the received transmission data according to the data priority identification and the data type of the transmission data;
the data with the priority levels can be cached respectively based on the data priority level identification and the data integrity, and the cached data has the integrity.
Referring to fig. 9, fig. 9 is a schematic flowchart of an embodiment of step T2 of the present invention, where step T2 includes:
t21, judging whether the data packets in the transmission data are continuous or not based on the data priority identification, the data type, the data packet sequence number and the data integrity of the transmission data;
the data packet sequence number is a data packet sequence number included in header information of the data to be transmitted, for example, the data to be transmitted includes a plurality of audio data packets, and each data packet sets a data packet sequence number according to a sequence, so that whether the data packets are continuous or not can be judged according to the data packet sequence number.
In some embodiments, various data judgment sequences can be divided based on the data priority identification and the data type, for example, if the transmission data includes signaling data, audio data and video data, the signaling data, the audio data and the video data are judged in sequence; and judging whether the data packets in the transmission data are continuous or not based on the data packet sequence numbers.
T22, if the data packets are continuous, storing the data packets into a buffer memory;
if the data packets are continuous, it is indicated that no packet loss occurs in the data packets, and the data packets may be stored in the buffer queue corresponding to the receiving buffer area.
In some embodiments, if the message sequence numbers are consecutive, the data message is stored in the buffer queue corresponding to the data priority identifier, and the buffer readable position is updated.
And T23, if the data packet is not continuous, storing the data packet into a received packet loss list.
If the data packet is not continuous, it indicates that the data packet is lost, and the discontinuous data packet needs to be stored in a received packet loss list for subsequent processing.
In some embodiments, if the packet sequence number is discontinuous, determining whether the data packet is a retransmission packet according to the packet sequence number, if the data packet is a retransmission packet, deleting the packet sequence number from the received packet loss list, if the data packet is not a retransmission packet, adding the discontinuous packet sequence number to the received packet loss list, and periodically returning the received packet loss list to the sending end.
In some embodiments, after the step of determining whether the data packet is a retransmission packet is completed, the method further includes: and judging whether the feedback period in the received packet loss list is expired or not, and setting a first notification event identifier when the feedback period in the received packet loss list is expired.
In some embodiments, it is determined whether a feedback period of the receiving rate information expires, and the second notification event identifier is set when the feedback period of the receiving rate information expires, wherein the receiving rate information is obtained by counting the receiving packet rate when parsing the packet.
In some embodiments, whether the first notification event identifier and the second notification event identifier have set values or not is judged, if the set values exist, the feedback data is encapsulated according to the set identifiers, the UDP interface is called to send the feedback data, and if the set values do not exist, the method is ended.
Optionally, the information such as the packet loss sequence number and the packet receiving rate in the received packet loss list is periodically returned to the sending end.
And T3, decoding and playing the buffered transmission data.
And the application layer module reads corresponding data according to the corresponding protocol.
In some real-time instances, the receiving end may notify the application layer module to read data, analyze corresponding data according to a corresponding protocol, and decode and play the corresponding data through the decoding module, for example, the streaming media module analyzes audio data according to the streaming media protocol, puts the audio data into the receiving buffer, and decodes and plays the audio data through the audio decoding module.
Different from the prior art, in the embodiment, the data priority identifier and the data type of the transmission data are obtained by receiving and analyzing the transmission data; caching the received transmission data according to the data priority identification and the data type of the transmission data; the buffered transmission data is decoded and played, and the transmission data is sequentially received and decoded through the data priority identification, so that the problems of audio data delay and even sound interruption when the network fluctuates can be effectively avoided.
Referring to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of a data transmission system 200 according to the present invention, which includes a first data transmission device 210 and a second data transmission device 220; wherein, the first data transmission device 210 transmits data by the data transmission method applied to the transmitting end as described above, and the second data transmission device 220 receives data by the data transmission method applied to the receiving end as described above, and the related contents refer to the detailed description of the above method, which is not described in detail herein.
Referring to fig. 11, fig. 11 is a schematic structural diagram of an electronic device 300 according to an embodiment of the present invention, the electronic device 300 includes a memory 310 and a processor 320 coupled to the memory, the memory 310 stores at least one computer program, and the at least one computer program is used for implementing the data transmission method when being loaded and executed by the processor 320, and related contents refer to detailed descriptions of the method, which are not repeated herein.
Referring to fig. 12, fig. 12 is a schematic structural diagram of an embodiment of a computer-readable storage medium according to the present invention, in which at least one program 410 is stored in the storage medium 400, and when the at least one program 410 is loaded and executed by a processor, the data transmission method is implemented. For a detailed description of the above method, please refer to the above method, which is not repeated herein.
According to the scheme, the data priority identification is set for the data to be transmitted according to the data type, and then the data to be transmitted are sequentially sent and received according to the data priority identification, when network fluctuation or network congestion occurs, the audio data can be sent preferentially, and the problem that the audio data is delayed and even sounds are intermittent is avoided.
In the several embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one type of logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (15)
1. A data transmission method, applied to a transmitting end, the method comprising:
acquiring data to be transmitted and setting data priority identification according to the data type so as to divide the data into data with different priorities;
caching the data with different priorities to corresponding buffer queues;
and sequentially sending the data with different priorities in the buffer queue based on the data priority identification.
2. The method of claim 1,
the acquiring data to be transmitted and setting data priority identification according to data types to divide the data into different priority data comprises the following steps:
acquiring signaling data, audio data and video data in data to be transmitted, setting a data priority identifier of the signaling data as a first priority, setting a data priority identifier of the audio data as a second priority, and setting a data priority identifier of the video data as a third priority; wherein the priority levels of the first priority to the third priority are sequentially decreased.
3. The method of claim 2,
the buffering the data with different priorities to the corresponding buffer queues includes:
and respectively caching the data with different priorities to corresponding buffer queues according to the data priority identifications, wherein the signaling data with the first priority are cached to the signaling buffer queues, the audio data with the second priority are cached to the audio buffer queues, and the video data with the third priority are cached to the video buffer queues.
4. The method of claim 1,
after acquiring data to be transmitted and setting data priority identification according to data types to divide the data into data with different priorities, the data transmission method further comprises the following steps:
acquiring the data length of data to be transmitted;
acquiring the residual space of the buffer queue corresponding to the data priority identification;
and if the residual space is less than 0, returning, and if the residual space is greater than 0, caching the data to be transmitted into a corresponding buffer queue according to the minimum value between the data length and the residual space.
5. The method of claim 1,
the sequentially sending the data with different priorities in the buffer queue based on the data priority identification comprises:
sequentially inquiring whether data are to be sent in a sending buffer queue or not according to the data priority identification, and if the data are to be sent, acquiring the data in the sending buffer queue; if no data is to be sent, inquiring whether data is to be sent in the next sending buffer queue or not, and finishing the inquiry of all sending buffer queues;
and adding header information corresponding to the data priority identification to the data acquired by query to form a data packet, and sequentially transmitting the data packet based on the header information.
6. The method of claim 5,
the method for adding the header information corresponding to the data priority identification to the inquired and obtained data to form a data packet and sequentially sending the data packet based on the header information comprises the following steps:
adding head information to the data acquired by query, and packaging the data into a data packet; wherein, the header information comprises a data packet sequence number and a data priority identification;
obtaining the size of a congestion window and the size of data which is sent but not confirmed by an opposite terminal and comparing the sizes;
if the congestion window is smaller than or equal to the size of the data which is not confirmed by the opposite end, the data cannot be sent;
and if the congestion window is larger than the size of the data which is not confirmed by the opposite end, sequentially sending the data packets in each buffer queue according to the data packet sequence number, the data priority identification and the size of the congestion window.
7. The method of claim 5,
before inquiring the sending buffer queue, the method further comprises the following steps:
acquiring a sending packet loss list and judging whether the sending packet loss list is empty or not;
if the transmission packet loss list is empty, entering transmission buffer queue query;
and if the transmission packet loss list is not empty, acquiring the data packet with the highest priority in the current transmission packet loss list, and further packaging the data packet for transmission.
8. A data transmission method, applied to a receiving end, the method comprising:
receiving and analyzing transmission data, and acquiring a data priority identifier and a data type of the transmission data;
caching the received transmission data according to the data priority identification and the data type of the transmission data;
and decoding and playing the buffered transmission data.
9. The method of claim 8,
the receiving and analyzing the transmission data to obtain the data priority identification and the data type of the transmission data comprises the following steps:
receiving a data packet in transmission data, analyzing the data packet, and acquiring a data priority identifier, a data packet sequence number, a data type and data integrity of the data packet; reading the content of the control message for the analyzed control message, if the content of the control message is NACK, setting a packet loss sending list, and otherwise, setting congestion control information; for the analyzed data message, acquiring a priority identifier and a message serial number of the data message; wherein, the message sequence number corresponds to the data packet sequence number.
10. The method of claim 9,
the caching the received transmission data according to the data priority identification and the data type of the transmission data respectively comprises the following steps:
and judging whether data packets in the transmission data are continuous or not based on the data priority identification, the data type, the data packet sequence number and the data integrity of the transmission data, if so, storing the data packets into a cache, and if not, storing the data packets into a packet loss receiving list.
11. The method of claim 10,
the determining, based on the data priority identifier of the transmission data, the data type, the data packet sequence number, and the data integrity, whether data packets in the transmission data are continuous or not, and if the data packets are continuous, storing the data packets in a buffer, and if the data packets are discontinuous, storing the data packets in a packet loss receiving list, includes:
if the message serial numbers are continuous, storing the data messages into a buffer queue corresponding to the data priority identification, updating the readable buffer position, if the message serial numbers are discontinuous, judging whether the data messages are retransmission packets according to the message serial numbers, if the data packets are the retransmission packets, deleting the message serial numbers from a received packet loss list, if the data packets are not the retransmission packets, adding the discontinuous message serial numbers into the received packet loss list, and periodically returning the received packet loss list to the sending end.
12. The method of claim 11,
after the step of determining whether the data packet is a retransmission packet is completed, the method further includes:
judging whether a feedback period in the received packet loss list is due or not, and setting a first notification event identifier when the feedback period in the received packet loss list is due;
after the step of updating the buffer readable location is completed, the method further comprises:
judging whether the feedback period of the receiving rate information is due or not, and setting a second notification event identifier when the feedback period of the receiving rate information is due;
and judging whether the first notification event identifier and the second notification event identifier have set positions or not, if so, packaging feedback data according to the set position identifiers, calling a UDP interface to send the feedback data, and if not, ending the operation.
13. A data transmission system, characterized in that the data transmission system comprises a first data transmission device and a second data transmission device; wherein the first data transmission device transmits data by the data transmission method according to any one of claims 1 to 7, and the second data transmission device receives data by the data transmission method according to any one of claims 8 to 12.
14. An electronic device, comprising a memory and a processor coupled to the memory, wherein the memory stores at least one computer program that, when loaded and executed by the processor, is adapted to implement the data transmission method of any one of claims 1-12.
15. A computer-readable storage medium, characterized in that the storage medium stores at least one program which, when loaded and executed by a processor, is adapted to carry out the data transmission method according to any one of claims 1 to 12.
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