CN110830818A - Video transmission method and device - Google Patents
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- CN110830818A CN110830818A CN201810911748.5A CN201810911748A CN110830818A CN 110830818 A CN110830818 A CN 110830818A CN 201810911748 A CN201810911748 A CN 201810911748A CN 110830818 A CN110830818 A CN 110830818A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000010586 diagram Methods 0.000 description 16
- 238000012545 processing Methods 0.000 description 8
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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
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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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
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
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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
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
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Abstract
The present disclosure relates to a video transmission method and apparatus, relating to the technical field of terminals, and applied to a transmitting end, the method includes: the method comprises the steps of sending a video data packet to be sent and indication information to a physical layer of a sending end through a target layer of the sending end, wherein the target layer of the sending end is an upper layer protocol stack of the physical layer, determining the maximum retransmission times according to the indication information through the physical layer of the sending end, modulating a physical layer check code and the video data packet into modulated data through the physical layer of the sending end, sending the modulated data to a receiving end, demodulating the modulated data through the physical layer of the receiving end to obtain the physical layer check code and the video data packet, judging whether the modulated data are sent to the receiving end again or not according to the times of obtaining retransmission requests and the maximum retransmission times through the physical layer of the sending end, and sending the retransmission requests when the video data packet is checked to be wrong according to the physical layer check code by the physical. The quality of video transmission can be improved.
Description
Technical Field
The present disclosure relates to the field of terminal technologies, and in particular, to a video transmission method and apparatus.
Background
With the continuous development of terminal technology and image transmission technology, people can more conveniently use various intelligent terminals to watch video data, the requirements on video and image quality are increasingly improved, if the problem of data packet loss or error occurs in the video data transmission process, if the lost or error data packet is a key frame, the video quality is seriously influenced, the problems of blocking, blurring or mosaic and the like are caused, the user experience is reduced, the video data can be recovered only by retransmitting the lost or error data packet, and larger time delay is caused.
Disclosure of Invention
To overcome the problems in the related art, it is an object of the present disclosure to provide a video transmission method and apparatus.
According to a first aspect of the embodiments of the present disclosure, a video transmission method is provided, which is applied to a sending end, and the method includes:
sending a video data packet to be sent and indication information to a physical layer of the sending end through a target layer of the sending end, wherein the target layer of the sending end is an upper protocol stack of the physical layer, and the indication information is used for indicating the coding form of the video data packet;
determining the maximum retransmission times according to the indication information through a physical layer of the sending end;
modulating a physical layer check code and the video data packet into modulated data through a physical layer of the sending end, sending the modulated data to a receiving end, demodulating the modulated data through the physical layer of the receiving end to obtain the physical layer check code and the video data packet, wherein the physical layer check code is generated by the physical layer of the sending end according to the received data packet;
and judging whether to resend the modulation data to the receiving end or not according to the times of acquiring the retransmission request and the maximum retransmission times by the physical layer of the sending end, wherein the retransmission request is sent by the physical layer of the receiving end when the video data packet is checked to be wrong according to the check code of the physical layer.
Optionally, the determining, by the physical layer of the sending end, the maximum retransmission number according to the indication information includes:
when the indication information indicates that the coding form of the first video data packet is a key frame form, determining the maximum retransmission times to be a preset first numerical value through a physical layer of the sending end;
when the indication information indicates that the coding form of the first video data packet is a non-key frame form, determining the maximum retransmission times to be a preset second numerical value through a physical layer of the sending end;
wherein the first value is greater than the second value, and the data packet encoded in the form of a key frame is an independent frame that contains complete decoded data and is independent of neighboring frames.
Optionally, the determining, by the physical layer of the sending end, whether to resend the modulation data to the receiving end according to the number of times of obtaining the retransmission request and the maximum retransmission number includes:
when the number of times that the physical layer of the sending end acquires the retransmission request is less than or equal to the maximum retransmission number, retransmitting the modulation data to the receiving end through the physical layer of the sending end;
and when the times of acquiring the retransmission request by the physical layer of the sending end is greater than the maximum retransmission times, rejecting the retransmission request by the physical layer of the sending end.
Optionally, the video data packet includes video data and a sequence number used for indicating an order of the video data packet in a video data stream, where the sequence number enables a target layer at the receiving end to determine the order of the video data packet in the video data stream.
According to a second aspect of the embodiments of the present disclosure, there is provided a video transmission method applied to a receiving end, the method including:
demodulating the modulated data sent by the sending end through a physical layer of the receiving end to obtain a physical layer check code and a video data packet;
checking whether the video data packet is correct or not through a physical layer of the receiving end according to the physical layer check code;
when the video data packet is in error, sending a retransmission request to a physical layer of the sending end through the physical layer of the receiving end;
the modulation data is obtained by transmitting a video data packet to be transmitted and indication information to a physical layer of the transmitting end through a target layer of the transmitting end and modulating the physical layer check code and the video data packet through the physical layer of the transmitting end.
Optionally, the video data packet includes video data and a sequence number, and the method further includes:
when the video data packet is correct, the video data packet is sent to a target layer of the receiving end through a physical layer of the receiving end, and the target layer of the receiving end is an upper layer protocol stack of the physical layer;
and determining the sequence of the video data packets in the video data stream according to the sequence number through the target layer of the receiving end.
Optionally, the method further includes:
when the time length of the target layer of the receiving end waiting for the first video data packet corresponding to the first sequence number is less than or equal to the preset waiting time length, waiting for the first video data packet sent by the physical layer of the receiving end through the target layer of the receiving end, wherein the first video data packet is any video data packet;
and when the time length for the target layer of the receiving end to wait for the first video data packet is longer than the waiting time length or the target layer of the receiving end acquires all video data packets corresponding to the sequence numbers, forming the acquired at least one video data packet into the video data stream according to the sequence through the target layer of the receiving end so as to be processed by the receiving end.
According to a third aspect of the embodiments of the present disclosure, there is provided a video transmission apparatus applied to a transmitting end, the apparatus including:
a first sending module, configured to send a video data packet to be sent and indication information to a physical layer of the sending end through a target layer of the sending end, where the target layer of the sending end is an upper protocol stack of the physical layer, and the indication information is used to indicate a coding form of the video data packet;
a determining module, configured to determine, by a physical layer of the sending end, a maximum retransmission number according to the indication information;
the second sending module is used for modulating a physical layer check code and the video data packet into modulated data through a physical layer of the sending end, sending the modulated data to a receiving end, demodulating the modulated data through the physical layer of the receiving end to obtain the physical layer check code and the video data packet, wherein the physical layer check code is generated by the physical layer of the sending end according to the received data packet;
and the judging module is used for judging whether to resend the modulation data to the receiving end or not according to the times of acquiring the retransmission request and the maximum retransmission times by the physical layer of the sending end, wherein the retransmission request is sent by the physical layer of the receiving end when the video data packet is checked to be wrong according to the physical layer check code.
Optionally, the determining module includes:
a first determining sub-module, configured to determine, by a physical layer of the sending end, that the maximum retransmission time is a preset first value when the indication information indicates that the encoding format of the first video data packet is a key frame format;
a second determining sub-module, configured to determine, by the physical layer of the sending end, that the maximum retransmission time is a preset second value when the indication information indicates that the encoding format of the first video data packet is a non-key frame format;
wherein the first value is greater than the second value, and the data packet encoded in the form of a key frame is an independent frame that contains complete decoded data and is independent of neighboring frames.
Optionally, the determining module includes:
the sending submodule is used for resending the modulation data to the receiving end through the physical layer of the sending end when the times of acquiring the retransmission request by the physical layer of the sending end is less than or equal to the maximum retransmission times;
and the rejecting submodule is used for rejecting the retransmission request through the physical layer of the sending end when the times of acquiring the retransmission request by the physical layer of the sending end is greater than the maximum retransmission times.
Optionally, the video data packet includes video data and a sequence number used for indicating an order of the video data packet in a video data stream, where the sequence number enables a target layer at the receiving end to determine the order of the video data packet in the video data stream.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a video transmission apparatus applied to a receiving end, the apparatus including:
the demodulation module is used for demodulating the modulated data sent by the sending end through the physical layer of the receiving end to obtain a physical layer check code and a video data packet;
the checking module is used for checking whether the video data packet is correct or not through a physical layer of the receiving end according to the physical layer checking code;
a first sending module, configured to send a retransmission request to a physical layer of the sending end through the physical layer of the receiving end when the video data packet is an error;
the modulation data is obtained by transmitting a video data packet to be transmitted and indication information to a physical layer of the transmitting end through a target layer of the transmitting end and modulating the physical layer check code and the video data packet through the physical layer of the transmitting end.
Optionally, the video data packet includes video data and a sequence number, and the apparatus further includes:
a second sending module, configured to send the video data packet to a target layer of the receiving end through a physical layer of the receiving end when the video data packet is correct, where the target layer of the receiving end is an upper layer protocol stack of the physical layer;
and the sequence determining module is used for determining the sequence of the video data packet in the video data stream according to the sequence number through the target layer of the receiving end.
Optionally, the apparatus further comprises:
a waiting module, configured to wait, by the target layer of the receiving end, for a first video data packet sent by the physical layer of the receiving end when a duration for the target layer of the receiving end to wait for the first video data packet corresponding to the first sequence number is less than or equal to a preset waiting duration, where the first video data packet is any video data packet;
and the third sending module is configured to, when the duration that the target layer of the receiving end waits for the first video data packet is longer than the waiting duration, or the target layer of the receiving end has obtained all the video data packets corresponding to the sequence numbers, form, by the target layer of the receiving end, the video data stream with the obtained at least one video data packet according to the sequence, so as to be processed by the receiving end.
According to the technical scheme, the target layer of the sending end sends the video data packet to be sent and the indication information used for indicating the coding form of the video data packet to the physical layer of the sending end, the physical layer of the sending end determines the maximum retransmission times corresponding to the video data packet according to the indication information, modulates the physical layer check code and the video data packet into modulated data and sends the modulated data to the receiving end, and the physical layer of the receiving end demodulates the modulated data to obtain the physical layer check code and the video data packet. When the physical layer of the receiving end checks that the video data packet is wrong according to the physical layer check code, the physical layer of the receiving end sends a retransmission request to the physical layer of the sending end, and the physical layer of the sending end judges whether to send the modulation data to the receiving end again according to the times of obtaining the retransmission request and the determined maximum retransmission times. When the transmission of the video data has errors, the quality of the video transmission can be improved, and the feedback time delay can be reduced.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a method of video transmission according to an exemplary embodiment;
FIG. 2 is a flow diagram illustrating another method of video transmission in accordance with an exemplary embodiment;
FIG. 3 is a flow diagram illustrating another method of video transmission in accordance with an exemplary embodiment;
FIG. 4 is a flow chart illustrating a method of video transmission according to an exemplary embodiment;
FIG. 5 is a flow diagram illustrating another method of video transmission in accordance with an exemplary embodiment;
FIG. 6 is a flow diagram illustrating another method of video transmission in accordance with an exemplary embodiment;
FIG. 7 is a block diagram illustrating a video transmission device in accordance with an exemplary embodiment;
FIG. 8 is a block diagram illustrating another video transmission device in accordance with an exemplary embodiment;
FIG. 9 is a block diagram illustrating another video transmission device in accordance with an exemplary embodiment;
FIG. 10 is a block diagram illustrating a video transmission device in accordance with an exemplary embodiment;
FIG. 11 is a block diagram illustrating another video transmission device in accordance with an exemplary embodiment;
fig. 12 is a block diagram illustrating another video transmission apparatus according to an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Before introducing the video transmission method and apparatus provided by the present disclosure, an application scenario related to each embodiment in the present disclosure is first introduced, where the application scenario includes a sending end that sends video data and a receiving end that receives video data in a video transmission process. The sending end may be any server in the internet or other types of data terminals, and the receiving end may be any terminal, for example, a mobile terminal such as a smart phone, a tablet computer, a smart television, a smart watch, a PDA (Personal Digital Assistant, chinese), a portable computer, or a fixed terminal such as a desktop computer.
Fig. 1 is a flowchart illustrating a video transmission method according to an exemplary embodiment, where the method is applied to a transmitting end, as shown in fig. 1, and the method includes:
For example, in a video transmission process, an application layer (for example, an image processing module) at a sending end sends a generated video data packet to be sent to a target layer, the target layer analyzes the video data packet according to a preset mode, determines that an encoding form of data in the video data packet is a key frame form or a non-key frame form, and uses a determination result as indication information, for example, the indication information may be set to a flag bit with a size of 1 bit, where the flag bit is 1 and indicates that the video data packet is a key frame, and the flag bit is 0 and indicates that the video data packet is a non-key frame. The target layer sends the video data packet and the indication information to a physical layer of the sending end according to a preset packing format, wherein the preset packing format can be specified by a protocol on the target layer or can be a rule agreed by the sending end and the receiving end in advance. The target layer may be a protocol stack on a physical layer in a computer network structure, and may be, for example: a data link layer, a network layer, or a transport layer. The processing layer in this embodiment includes, but is not limited to, a structure in an Open System Interconnect (Open System Interconnect) seven-layer protocol or a network five-layer protocol, and may also be applicable to other network structures.
And step 102, determining the maximum retransmission times through the physical layer of the sending end according to the indication information.
For example, in the process of video data transmission, the RLC (Radio link control, chinese: Radio link layer control protocol) layer of the sending end in the data link layer is usually in an UM (Unacknowledged Mode), if a lost or erroneous data packet is a key frame, the video quality is more seriously affected, for example, the problems of stuck, fuzzy or mosaic are caused, but the non-key frame is lost or erroneous, and the non-key frame can be recovered according to the previous video data packet and/or the next video data packet.
And 103, modulating the physical layer check code and the video data packet into modulated data through a physical layer of the sending end, sending the modulated data to the receiving end, demodulating the modulated data through the physical layer of the receiving end to obtain a physical layer check code and a video data packet, wherein the physical layer check code is generated by the physical layer of the sending end according to the received data packet.
For example, the physical layer at the transmitting end modulates the physical layer check code and the video data packet into modulated data according to a preset modulation mode, where the preset modulation mode may be specified by a protocol on the physical layer, or may be a rule agreed in advance by the transmitting end and the receiving end. The physical layer Check Code is a Check Code generated by the physical layer according to the received data packet, and may be, for example, a parity Check Code, a Hamming Code, a CRC (Cyclic Redundancy Check, chinese), and the like. After receiving the modulated data, the physical layer of the receiving end demodulates the demodulated data according to a preset demodulation mode to obtain a physical layer check code and a video data packet contained in the modulated data, wherein the preset demodulation mode is a demodulation mode corresponding to the preset modulation mode.
And step 104, judging whether to retransmit the modulated data to the receiving end or not by the physical layer of the sending end according to the times of acquiring the retransmission request and the maximum retransmission times, wherein the retransmission request is sent by the physical layer of the receiving end when the video data packet is checked to be wrong according to the check code of the physical layer.
For example, when the physical layer of the receiving end checks that the video data packet is an error according to the physical layer check code, the physical layer of the receiving end sends a retransmission request to the sending end, the physical layer of the sending end receives the retransmission request, and counts the retransmission request at the same time to obtain the number of times that the physical layer obtains the retransmission request, for example, a counter with an initial value of 0 may be set for the modulated data, and the counter is incremented every time the retransmission request of the modulated data is received. The physical layer determines whether to retransmit the modulated data to the receiving end according to the number of times of acquiring the retransmission request and the maximum number of times of retransmission, for example, when the number of times of acquiring the retransmission request is less than or equal to the corresponding maximum number of times of retransmission, the physical layer retransmits the modulated data to the receiving end, and when the number of times of acquiring the retransmission request is greater than the corresponding maximum number of times of retransmission, the physical layer does not retransmit the modulated data to the receiving end. Since the retransmission request is transmitted between the physical layer of the receiving end and the physical layer of the transmitting end, the time delay is much smaller than the time delay for implementing the retransmission on the target layer, for example: for the HARQ (Hybrid Automatic repeat Request, chinese) technology of the physical layer and the ARQ (Automatic repeat-Request, chinese) technology of the data link layer, HARQ retransmission is in millisecond level, and the feedback delay can be effectively reduced.
In summary, in the present disclosure, a target layer of a sending end sends a video data packet to be sent and indication information for indicating a coding format of the video data packet to a physical layer of the sending end, the physical layer of the sending end determines a maximum retransmission time corresponding to the video data packet according to the indication information, modulates a physical layer check code and the video data packet into modulated data, and sends the modulated data to a receiving end, where the physical layer of the receiving end demodulates the modulated data to obtain the physical layer check code and the video data packet. When the physical layer of the receiving end checks that the video data packet is wrong according to the physical layer check code, the physical layer of the receiving end sends a retransmission request to the physical layer of the sending end, and the physical layer of the sending end judges whether to send the modulation data to the receiving end again according to the times of obtaining the retransmission request and the determined maximum retransmission times. When the transmission of the video data has errors, the quality of the video transmission can be improved, and the feedback time delay can be reduced.
Fig. 2 is a flow chart illustrating another video transmission method according to an example embodiment, as shown in fig. 2, step 102 includes:
In step 1022, when the indication information indicates that the encoding format of the first video data packet is a non-key frame format, the maximum retransmission time is determined to be a preset second value by the physical layer of the sending end.
Wherein the first value is greater than the second value, the data packet encoded in the form of a key frame is an independent frame that contains complete decoded data and is independent of adjacent frames.
For example, whether the coding format of the first video data packet is the key frame format or the non-key frame format is determined according to the indication information, taking the indication information as a flag bit with a size of 1 bit as an example, when the flag bit is 1, the video data packet is represented as a key frame, the physical layer of the sending end determines that the maximum retransmission number corresponding to the video data packet is a first numerical value, when the flag bit is 0, the video data packet is represented as a non-key frame, and the physical layer of the sending end determines that the maximum retransmission number corresponding to the video data packet is a second numerical value. Wherein the first value is set to be greater than the second value, for example the first value may be set to 8 times and the second value may be set to 4 times. The maximum retransmission times corresponding to the key frames are larger than the maximum retransmission times corresponding to the non-key frames, so that the key frames are ensured not to be lost as far as possible, and the aim of improving the quality of video transmission is fulfilled. When it needs to be described, the maximum retransmission number corresponding to the key frame is increased, and the waiting time of the receiving end is adjusted to adapt to multiple retransmission requests of the key frame according to a predetermined convention to correspondingly extend the time length of a reordering timer (for example, the time length may be extended to 85 milliseconds) in the RLC layer of the receiving end.
Fig. 3 is a flow chart illustrating another video transmission method according to an example embodiment, as shown in fig. 3, step 104 includes:
in step 1041, when the number of times that the physical layer of the sending end acquires the retransmission request is less than or equal to the maximum retransmission number, the modulated data is retransmitted to the receiving end through the physical layer of the sending end.
In step 1042, when the number of times that the physical layer of the sending end obtains the retransmission request is greater than the maximum retransmission number, the physical layer of the sending end rejects the retransmission request.
For example, the physical layer of the sending end counts the retransmission requests while receiving the retransmission requests, and when the number of times of obtaining the retransmission requests is less than or equal to the maximum retransmission number, the physical layer retransmits the modulated data to the receiving end, and when the number of times of obtaining the retransmission requests is greater than the maximum retransmission number, the physical layer does not transmit the modulated data to the receiving end. Therefore, if the lost or error data packet is a key frame, the aim of ensuring the data packet not to be lost as far as possible is fulfilled through repeated retransmission.
Optionally, the video data packet includes video data and a sequence number used for indicating an order of the video data packet in the video data stream, and the sequence number enables a target layer at a receiving end to determine the order of the video data packet in the video data stream.
For example, when video data is stored in the RLC layer of the transmitting end, the RLC layer may divide the entire video data stream into multiple segments (which may be understood as multiple video data packets) according to the bandwidth of wireless communication, and then serially connect the multiple segments and sequentially transmit the multiple segments downward, where a Sequence Number (SN) may be used to ensure the transmission Sequence of the entire video data stream, and correspondingly, when the RLC layer of the receiving end receives a video data packet, the Sequence of the video data stream is also recovered by the Sequence Number.
In summary, in the present disclosure, a target layer of a sending end sends a video data packet to be sent and indication information for indicating a coding format of the video data packet to a physical layer of the sending end, the physical layer of the sending end determines a maximum retransmission time corresponding to the video data packet according to the indication information, modulates a physical layer check code and the video data packet into modulated data, and sends the modulated data to a receiving end, where the physical layer of the receiving end demodulates the modulated data to obtain the physical layer check code and the video data packet. When the physical layer of the receiving end checks that the video data packet is wrong according to the physical layer check code, the physical layer of the receiving end sends a retransmission request to the physical layer of the sending end, and the physical layer of the sending end judges whether to send the modulation data to the receiving end again according to the times of obtaining the retransmission request and the determined maximum retransmission times. When the transmission of the video data has errors, the quality of the video transmission can be improved, and the feedback time delay can be reduced.
Fig. 4 is a flowchart illustrating a video transmission method according to an exemplary embodiment, as shown in fig. 4, applied to a receiving end, the method including:
For example, the physical layer of the receiving end demodulates the modulated data sent by the sending end according to the demodulation mode agreed with the sending end to obtain the physical layer check code and the video data packet. The modulation data is obtained by transmitting a video data packet to be transmitted and indication information to a physical layer of a transmitting end through a target layer of the transmitting end, wherein the indication information is used for indicating a coding form of the video data packet, and modulating a physical layer check code and the video data packet through the physical layer of the transmitting end.
For example, the physical layer of the receiving end checks whether the video data packet is correct according to the physical layer check code, and when the video data packet is erroneous, the physical layer sends a retransmission request to the physical layer of the transmitting end. It should be noted that, when the video data packet is an error and the physical layer of the sending end has rejected the retransmission request (for example, the physical layer of the sending end may send a rejection confirmation message to the receiving end to notify the receiving end that the retransmission request has been rejected), that is, the retransmission request has exceeded the maximum retransmission times set by the physical layer of the sending end, the physical layer may not send the retransmission request to the physical layer of the sending end any more.
In summary, in the present disclosure, a target layer of a sending end sends a video data packet to be sent and indication information for indicating a coding format of the video data packet to a physical layer of the sending end, the physical layer of the sending end determines a maximum retransmission time corresponding to the video data packet according to the indication information, modulates a physical layer check code and the video data packet into modulated data, and sends the modulated data to a receiving end, where the physical layer of the receiving end demodulates the modulated data to obtain the physical layer check code and the video data packet. When the physical layer of the receiving end checks that the video data packet is wrong according to the physical layer check code, the physical layer of the receiving end sends a retransmission request to the physical layer of the sending end, and the physical layer of the sending end judges whether to send the modulation data to the receiving end again according to the times of obtaining the retransmission request and the determined maximum retransmission times. When the transmission of the video data has errors, the quality of the video transmission can be improved, and the feedback time delay can be reduced.
Fig. 5 is a flow chart illustrating another video transmission method according to an exemplary embodiment, where, as shown in fig. 5, a video data packet includes video data and a sequence number, the method further includes:
and step 204, when the video data packet is correct, sending the video data packet to a target layer of the receiving end through a physical layer of the receiving end, wherein the target layer of the receiving end is an upper layer protocol stack of the physical layer.
For example, when the video data packet is correct, the physical layer sends the video data packet to a target layer of the receiving end, where the target layer may be a protocol stack above the physical layer in the computer network structure, and may be, for example: a data link layer, a network layer, or a transport layer. The video data stream may include a plurality of video data packets, and the sequence of the plurality of video data packets received by the target layer may be determined by sequence numbers, for example, when the target layer is a data link layer, an RLC layer in the data link layer recovers the video data stream according to the sequence numbers when processing the video data packets.
Fig. 6 is a flow chart illustrating another video transmission method according to an example embodiment, as shown in fig. 6, the method further comprising:
For example, the maximum retransmission times corresponding to the key frame is increased by the sending end, and the waiting time of the receiving end for each data packet can be correspondingly increased, so as to avoid the problem that the destination layer of the receiving end has abandoned the video data packet, and the physical layer of the receiving end still requests the sending end to retransmit the video data packet. Therefore, the receiving end can correspondingly extend the waiting time (for example, the reordering timer duration of the RLC layer can be set to 85 ms) according to the predetermined convention to adapt to the multiple retransmission requests of the key frame. A timer may be set on the target layer, timing is started while waiting for the first video data packet corresponding to the first sequence number, when the duration of waiting for the first video data packet is less than or equal to the waiting duration, the target layer continues to wait for the first video data packet sent by the physical layer, at this time, the target layer does not send the received video data packets (which may be one or more) to the higher layer, when the duration of waiting for the first video data packet is greater than the waiting duration, the target layer no longer waits for the first video data packet, but composes the received video data packets (which may be one or more) into video data streams according to the order determined in step 205, and sends the video data streams to the data stack of the upper layer of the target layer (which may be, for example, an image processing module on the application layer) for processing by the receiving end. Or, when the target layer has obtained all the video data packets corresponding to the sequence numbers, that is, no video data packet is lost or has an error in the transmission process, or has been completely received through the retransmission request, the received video data packets are made into a video data stream according to the sequence determined in step 205, and the video data stream is sent to the upper layer data stack of the target layer for processing by the receiving end.
In summary, in the present disclosure, a target layer of a sending end sends a video data packet to be sent and indication information for indicating a coding format of the video data packet to a physical layer of the sending end, the physical layer of the sending end determines a maximum retransmission time corresponding to the video data packet according to the indication information, modulates a physical layer check code and the video data packet into modulated data, and sends the modulated data to a receiving end, where the physical layer of the receiving end demodulates the modulated data to obtain the physical layer check code and the video data packet. When the physical layer of the receiving end checks that the video data packet is wrong according to the physical layer check code, the physical layer of the receiving end sends a retransmission request to the physical layer of the sending end, and the physical layer of the sending end judges whether to send the modulation data to the receiving end again according to the times of obtaining the retransmission request and the determined maximum retransmission times. When the transmission of the video data has errors, the quality of the video transmission can be improved, and the feedback time delay can be reduced.
Fig. 7 is a block diagram illustrating a video transmission apparatus according to an exemplary embodiment, as shown in fig. 7, applied to a transmitting end, the apparatus 300 including:
the first sending module 301 is configured to send a video data packet to be sent and indication information to a physical layer of a sending end through a target layer of the sending end, where the target layer of the sending end is an upper protocol stack of the physical layer, and the indication information is used to indicate a coding form of the video data packet.
A determining module 302, configured to determine the maximum retransmission times according to the indication information by the physical layer of the sending end.
The second sending module 303 is configured to modulate the physical layer check code and the video data packet into modulated data through the physical layer of the sending end, send the modulated data to the receiving end, demodulate the modulated data through the physical layer of the receiving end to obtain a physical layer check code and a video data packet, where the physical layer check code is a check code generated by the physical layer of the sending end according to the received data packet.
The determining module 304 is configured to determine whether to resend the modulated data to the receiving end by using the physical layer of the sending end to obtain the number of retransmission requests and the maximum retransmission number, where the retransmission requests are sent by the physical layer of the receiving end when the video data packet is checked to be an error according to the physical layer check code.
Fig. 8 is a block diagram illustrating another video transmission apparatus according to an exemplary embodiment, and as shown in fig. 8, the determining module 302 includes:
the first determining sub-module 3021 is configured to determine, by the physical layer of the sending end, that the maximum retransmission time is a preset first value when the indication information indicates that the encoding format of the first video data packet is the key frame format.
The second determining sub-module 3022 is configured to determine, when the indication information indicates that the encoding format of the first video data packet is a non-key frame format, that the maximum retransmission time is a preset second value through a physical layer of the sending end.
Wherein the first value is greater than the second value, the data packet encoded in the form of a key frame is an independent frame that contains complete decoded data and is independent of adjacent frames.
Fig. 9 is a block diagram of another video transmission apparatus according to an exemplary embodiment, and as shown in fig. 9, the determining module 304 includes:
the sending submodule 3041 is configured to, when the number of times that the physical layer of the sending end obtains the retransmission request is less than or equal to the maximum retransmission number, resend the modulated data to the receiving end through the physical layer of the sending end.
A rejecting submodule 3042, configured to reject the retransmission request through the physical layer of the sending end when the number of times that the physical layer of the sending end acquires the retransmission request is greater than the maximum retransmission number.
Optionally, the video data packet includes video data and a sequence number used for indicating an order of the video data packet in the video data stream, and the sequence number enables a target layer at a receiving end to determine the order of the video data packet in the video data stream.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
In summary, in the present disclosure, a target layer of a sending end sends a video data packet to be sent and indication information for indicating a coding format of the video data packet to a physical layer of the sending end, the physical layer of the sending end determines a maximum retransmission time corresponding to the video data packet according to the indication information, modulates a physical layer check code and the video data packet into modulated data, and sends the modulated data to a receiving end, where the physical layer of the receiving end demodulates the modulated data to obtain the physical layer check code and the video data packet. When the physical layer of the receiving end checks that the video data packet is wrong according to the physical layer check code, the physical layer of the receiving end sends a retransmission request to the physical layer of the sending end, and the physical layer of the sending end judges whether to send the modulation data to the receiving end again according to the times of obtaining the retransmission request and the determined maximum retransmission times. When the transmission of the video data has errors, the quality of the video transmission can be improved, and the feedback time delay can be reduced.
Fig. 10 is a block diagram of a video transmission apparatus according to an exemplary embodiment, as shown in fig. 10, applied to a receiving end, the apparatus 400 includes:
the demodulation module 401 is configured to demodulate, by using the physical layer of the receiving end, the modulated data sent by the sending end to obtain a physical layer check code and a video data packet.
A checking module 402, configured to check, by the physical layer of the receiving end, whether the video data packet is correct according to the physical layer check code.
A first sending module 403, configured to send a retransmission request to a physical layer of a sending end through the physical layer of the receiving end when the video data packet is in error.
The modulation data is obtained by transmitting a video data packet to be transmitted and indication information to a physical layer of a transmitting end through a target layer of the transmitting end and modulating a physical layer check code and the video data packet through the physical layer of the transmitting end.
Fig. 11 is a block diagram illustrating another video transmission apparatus according to an exemplary embodiment, where, as shown in fig. 11, a video data packet includes video data and a sequence number, the apparatus 400 further includes:
a second sending module 404, configured to send the video data packet to a target layer of the receiving end through a physical layer of the receiving end when the video data packet is correct, where the target layer of the receiving end is an upper layer protocol stack of the physical layer.
And a sequence determining module 405, configured to determine, by the target layer of the receiving end, a sequence of the video data packet in the video data stream according to the sequence number.
Fig. 12 is a block diagram illustrating another video transmission apparatus according to an exemplary embodiment, and as shown in fig. 12, the apparatus 400 further includes:
a waiting module 406, configured to wait, by the target layer of the receiving end, a first video data packet sent by the physical layer of the receiving end when a duration that the target layer of the receiving end waits for the first video data packet corresponding to the first sequence number is less than or equal to a preset waiting duration, where the first video data packet is any video data packet.
The third sending module 407 is configured to, when the duration of the first video data packet that is waited by the target layer of the receiving end is longer than the waiting duration, or the target layer of the receiving end has obtained video data packets corresponding to all the sequence numbers, form, by the target layer of the receiving end, a video data stream with at least one obtained video data packet in sequence for processing by the receiving end.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
In summary, in the present disclosure, a target layer of a sending end sends a video data packet to be sent and indication information for indicating a coding format of the video data packet to a physical layer of the sending end, the physical layer of the sending end determines a maximum retransmission time corresponding to the video data packet according to the indication information, modulates a physical layer check code and the video data packet into modulated data, and sends the modulated data to a receiving end, where the physical layer of the receiving end demodulates the modulated data to obtain the physical layer check code and the video data packet. When the physical layer of the receiving end checks that the video data packet is wrong according to the physical layer check code, the physical layer of the receiving end sends a retransmission request to the physical layer of the sending end, and the physical layer of the sending end judges whether to send the modulation data to the receiving end again according to the times of obtaining the retransmission request and the determined maximum retransmission times. When the transmission of the video data has errors, the quality of the video transmission can be improved, and the feedback time delay can be reduced.
Preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and other embodiments of the present disclosure may be easily conceived by those skilled in the art within the technical spirit of the present disclosure after considering the description and practicing the present disclosure, and all fall within the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. Meanwhile, any combination can be made between various different embodiments of the disclosure, and the disclosure should be regarded as the disclosure of the disclosure as long as the combination does not depart from the idea of the disclosure. The present disclosure is not limited to the precise structures that have been described above, and the scope of the present disclosure is limited only by the appended claims.
Claims (14)
1. A video transmission method is applied to a sending end, and the method comprises the following steps:
sending a video data packet to be sent and indication information to a physical layer of the sending end through a target layer of the sending end, wherein the target layer of the sending end is an upper protocol stack of the physical layer, and the indication information is used for indicating the coding form of the video data packet;
determining the maximum retransmission times according to the indication information through a physical layer of the sending end;
modulating a physical layer check code and the video data packet into modulated data through a physical layer of the sending end, sending the modulated data to a receiving end, demodulating the modulated data through the physical layer of the receiving end to obtain the physical layer check code and the video data packet, wherein the physical layer check code is generated by the physical layer of the sending end according to the received data packet;
and judging whether to resend the modulation data to the receiving end or not according to the times of acquiring the retransmission request and the maximum retransmission times by the physical layer of the sending end, wherein the retransmission request is sent by the physical layer of the receiving end when the video data packet is checked to be wrong according to the check code of the physical layer.
2. The method of claim 1, wherein the determining, by the physical layer of the transmitting end, the maximum number of retransmissions according to the indication information comprises:
when the indication information indicates that the coding form of the first video data packet is a key frame form, determining the maximum retransmission times to be a preset first numerical value through a physical layer of the sending end;
when the indication information indicates that the coding form of the first video data packet is a non-key frame form, determining the maximum retransmission times to be a preset second numerical value through a physical layer of the sending end;
wherein the first value is greater than the second value, and the data packet encoded in the form of a key frame is an independent frame that contains complete decoded data and is independent of neighboring frames.
3. The method of claim 1, wherein the determining, by the physical layer of the sending end, whether to resend the modulated data to the receiving end according to the number of times of obtaining the retransmission request and the maximum number of times of retransmission comprises:
when the number of times that the physical layer of the sending end acquires the retransmission request is less than or equal to the maximum retransmission number, retransmitting the modulation data to the receiving end through the physical layer of the sending end;
and when the times of acquiring the retransmission request by the physical layer of the sending end is greater than the maximum retransmission times, rejecting the retransmission request by the physical layer of the sending end.
4. The method of claim 1, wherein the video data packet comprises video data and a sequence number indicating an order of the video data packet in a video data stream, and the sequence number enables a target layer at the receiving end to determine the order of the video data packet in the video data stream.
5. A video transmission method applied to a receiving end, the method comprising:
demodulating the modulated data sent by the sending end through a physical layer of the receiving end to obtain a physical layer check code and a video data packet;
checking whether the video data packet is correct or not through a physical layer of the receiving end according to the physical layer check code;
when the video data packet is in error, sending a retransmission request to a physical layer of the sending end through the physical layer of the receiving end;
the modulation data is obtained by transmitting a video data packet to be transmitted and indication information to a physical layer of the transmitting end through a target layer of the transmitting end and modulating the physical layer check code and the video data packet through the physical layer of the transmitting end.
6. The method of claim 5, wherein the video data packet comprises video data and a sequence number, the method further comprising:
when the video data packet is correct, the video data packet is sent to a target layer of the receiving end through a physical layer of the receiving end, and the target layer of the receiving end is an upper layer protocol stack of the physical layer;
and determining the sequence of the video data packets in the video data stream according to the sequence number through the target layer of the receiving end.
7. The method of claim 6, further comprising:
when the time length of the target layer of the receiving end waiting for the first video data packet corresponding to the first sequence number is less than or equal to the preset waiting time length, waiting for the first video data packet sent by the physical layer of the receiving end through the target layer of the receiving end, wherein the first video data packet is any video data packet;
and when the time length for the target layer of the receiving end to wait for the first video data packet is longer than the waiting time length or the target layer of the receiving end acquires all video data packets corresponding to the sequence numbers, forming the acquired at least one video data packet into the video data stream according to the sequence through the target layer of the receiving end so as to be processed by the receiving end.
8. A video transmission apparatus, applied to a transmitting end, the apparatus comprising:
a first sending module, configured to send a video data packet to be sent and indication information to a physical layer of the sending end through a target layer of the sending end, where the target layer of the sending end is an upper protocol stack of the physical layer, and the indication information is used to indicate a coding form of the video data packet;
a determining module, configured to determine, by a physical layer of the sending end, a maximum retransmission number according to the indication information;
the second sending module is used for modulating a physical layer check code and the video data packet into modulated data through a physical layer of the sending end, sending the modulated data to a receiving end, demodulating the modulated data through the physical layer of the receiving end to obtain the physical layer check code and the video data packet, wherein the physical layer check code is generated by the physical layer of the sending end according to the received data packet;
and the judging module is used for judging whether to resend the modulation data to the receiving end or not according to the times of acquiring the retransmission request and the maximum retransmission times by the physical layer of the sending end, wherein the retransmission request is sent by the physical layer of the receiving end when the video data packet is checked to be wrong according to the physical layer check code.
9. The apparatus of claim 8, wherein the determining module comprises:
a first determining sub-module, configured to determine, by a physical layer of the sending end, that the maximum retransmission time is a preset first value when the indication information indicates that the encoding format of the first video data packet is a key frame format;
a second determining sub-module, configured to determine, by the physical layer of the sending end, that the maximum retransmission time is a preset second value when the indication information indicates that the encoding format of the first video data packet is a non-key frame format;
wherein the first value is greater than the second value, and the data packet encoded in the form of a key frame is an independent frame that contains complete decoded data and is independent of neighboring frames.
10. The apparatus of claim 8, wherein the determining module comprises:
the sending submodule is used for resending the modulation data to the receiving end through the physical layer of the sending end when the times of acquiring the retransmission request by the physical layer of the sending end is less than or equal to the maximum retransmission times;
and the rejecting submodule is used for rejecting the retransmission request through the physical layer of the sending end when the times of acquiring the retransmission request by the physical layer of the sending end is greater than the maximum retransmission times.
11. The apparatus of claim 8, wherein the video data packet comprises video data and a sequence number indicating an order of the video data packet in a video data stream, and wherein the sequence number enables a target layer at the receiving end to determine the order of the video data packet in the video data stream.
12. A video transmission apparatus, applied to a receiving end, the apparatus comprising:
the demodulation module is used for demodulating the modulated data sent by the sending end through the physical layer of the receiving end to obtain a physical layer check code and a video data packet;
the checking module is used for checking whether the video data packet is correct or not through a physical layer of the receiving end according to the physical layer checking code;
a first sending module, configured to send a retransmission request to a physical layer of the sending end through the physical layer of the receiving end when the video data packet is an error;
the modulation data is obtained by transmitting a video data packet to be transmitted and indication information to a physical layer of the transmitting end through a target layer of the transmitting end and modulating the physical layer check code and the video data packet through the physical layer of the transmitting end.
13. The apparatus of claim 12, wherein the video data packet comprises video data and a sequence number, the apparatus further comprising:
a second sending module, configured to send the video data packet to a target layer of the receiving end through a physical layer of the receiving end when the video data packet is correct, where the target layer of the receiving end is an upper layer protocol stack of the physical layer;
and the sequence determining module is used for determining the sequence of the video data packet in the video data stream according to the sequence number through the target layer of the receiving end.
14. The apparatus of claim 13, further comprising:
a waiting module, configured to wait, by the target layer of the receiving end, for a first video data packet sent by the physical layer of the receiving end when a duration for the target layer of the receiving end to wait for the first video data packet corresponding to the first sequence number is less than or equal to a preset waiting duration, where the first video data packet is any video data packet;
and the third sending module is configured to, when the duration that the target layer of the receiving end waits for the first video data packet is longer than the waiting duration, or the target layer of the receiving end has obtained all the video data packets corresponding to the sequence numbers, form, by the target layer of the receiving end, the video data stream with the obtained at least one video data packet according to the sequence, so as to be processed by the receiving end.
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