CN111263217A - Wireless screen projection method, wireless screen projection system and computer readable storage medium thereof - Google Patents
Wireless screen projection method, wireless screen projection system and computer readable storage medium thereof Download PDFInfo
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- CN111263217A CN111263217A CN202010100267.3A CN202010100267A CN111263217A CN 111263217 A CN111263217 A CN 111263217A CN 202010100267 A CN202010100267 A CN 202010100267A CN 111263217 A CN111263217 A CN 111263217A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims abstract description 32
- 238000004891 communication Methods 0.000 claims abstract description 20
- 230000004044 response Effects 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000001360 synchronised effect Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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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
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
-
- 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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
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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
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
-
- 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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The invention provides a wireless screen projection method, which is applied to a wireless screen projection system, wherein the wireless screen projection system comprises a screen projection control device and at least one device to be displayed; the wireless screen projection method comprises the following steps: step S1, the screen projection control device searches for a to-be-displayed device supporting screen projection; step S2, the screen projection control device generates the quantity information of the devices to be displayed supporting screen projection and detects the communication network quality information for calculating and obtaining the maximum transmission code rate; step S3, the screen projection control device encodes and compresses the video data, stamps a timestamp, and adjusts the timestamp according to the maximum transmission code rate to generate a video data packet; and step S4, the device to be displayed supporting screen projection receives and decodes the video data packet, and then synchronously plays the video data packet with the screen projection control device according to the timestamp in the video data packet. Compared with the related technology, the wireless screen projection method has the advantages of small video data packet, high screen projection synchronization rate and high stability.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of screen projection, in particular to a wireless screen projection method, a wireless screen projection system and a computer readable storage medium thereof.
[ background of the invention ]
With the development of screen projection technology, the wireless screen projection technology is widely applied to scenes such as conference lectures, demonstrations, video teaching and the like, wherein the synchronous screen projection technology for controlling a plurality of devices through one device is important.
In the related art, a wireless screen projection method generally performs one-to-many screen projection control through a multicast technology, that is, one screen projection control device encodes and compresses video data to be displayed and played on a screen to be projected, and sends the encoded and compressed video data to a plurality of display devices respectively, and the plurality of display devices decode and play the video data.
However, in the related art, the encoded and compressed video data is large, which is not beneficial to data transmission, and results in low screen-projection synchronization rate; in addition, the phenomena of packet loss and packet error are easy to occur, so that the screen is blocked or lost, the screen projection is unstable, and the user experience is poor.
Therefore, there is a need to provide a new wireless screen projection method, a wireless screen projection system and a computer readable storage medium to solve the above technical problems.
[ summary of the invention ]
The invention aims to provide a wireless screen projection method, a wireless screen projection system and a computer readable storage medium thereof, and the wireless screen projection method solves the problems that video and audio data after coding and compression are large, the screen projection synchronization rate is low, and the screen projection is unstable due to easy damage of the video and audio data, so that the user experience is poor.
In order to achieve the above object, the present invention provides a wireless screen projection method, which is applied to a wireless screen projection system, wherein the wireless screen projection system comprises a screen projection control device and at least one device to be displayed, which is in communication connection with the screen projection control device; the wireless screen projection method comprises the following steps:
step S1, the screen projection control device searches the device to be displayed supporting screen projection;
step S2, the screen projection control device generates the quantity information of the device to be displayed supporting screen projection, detects the communication network quality information, and calculates and obtains the maximum transmission code rate according to the quantity information and the communication network quality information;
step S3, the screen projection control device encodes and compresses the video data, stamps a timestamp, and adjusts the maximum transmission code rate to generate a video data packet; the video and audio data comprise video data and/or audio data, the number of the video and audio data packets is matched with the number of the devices to be displayed supporting screen projection, and the video and audio data packets and the time stamps are arranged in a one-to-one correspondence manner;
and step S4, the device to be displayed supporting screen projection receives and decodes the video data packet, and then synchronously plays the video data packet and the screen projection control device according to the timestamp in the video data packet.
Preferably, before the step S1, the method further includes: the device to be displayed is accessed into a local area network, and the screen projection control device is in communication connection with the device to be displayed through the local area network.
Preferably, in step S1, the screen projection control device searches for the to-be-displayed device supporting screen projection in the local area network, and establishes a TCP connection with one or more to-be-displayed devices supporting screen projection.
Preferably, in step S2, the communication network quality information is network quality information of the local area network.
Preferably, in step S3, the screen projection control device sends the video data packet to the device to be displayed supporting screen projection in a UDP manner.
Preferably, in step S3, the screen projection control device activates at least one video encoder to encode video data in the video data, and/or activates at least one audio encoder to encode audio data in the video data.
Preferably, the step S4 further includes:
the device to be displayed feeds back information about the sending quality, the sending quality and the response time of the video data packet to the screen projection control device in real time;
the following steps are also included after the step S4:
step S5, the screen projection control device determines whether the transmission of the video data packet is completed according to the information about the transmission quality, the transmission quality and the response time of the video data packet, if so, the screen projection control device returns to step S3 to generate the current video data to be processed into a new video data packet; if not, removing the audio-video data to be processed.
Preferably, the device to be displayed is one or more of a mobile terminal, a display screen and a projector.
The invention also provides a wireless screen projection system, which is characterized by comprising a processor and a memory, wherein the memory stores a control program for the processor to execute, and the control program realizes the steps of the wireless screen projection method when being executed by the processor.
The invention also provides a computer-readable storage medium, which stores a computer program, which, when executed by a processor, implements the steps of the wireless screen projection method of the invention.
Compared with the prior art, in the wireless screen projection method, the maximum transmission code rate is obtained through calculation according to the quantity information and the communication network quality information, and meanwhile, the screen projection control device adjusts the video data which is subjected to coding compression and time stamping according to the maximum transmission code rate to generate a video data packet; according to the method, the generated video data packet is small, the video data packet is protected to be transmitted under the maximum transmission code rate, the video data transmission rate is improved, real-time transmission of the video data is better realized, and therefore the screen projection synchronization rate is effectively improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic flow chart of a wireless screen projection method according to the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a wireless screen projection method, which is applied to a wireless screen projection system, wherein the wireless screen projection system comprises a screen projection control device and at least one device to be displayed, and the device to be displayed is in communication connection with the screen projection control device; the type of the device to be displayed is not limited, and may be one or more of a mobile terminal, a display screen and a projector, and the specific type and number of the devices to be displayed may be set according to the actual use situation.
The wireless screen projection method at least comprises the following steps:
the screen projection control device searches the to-be-displayed device supporting screen projection;
the screen projection control device generates quantity information of the to-be-displayed devices supporting screen projection, detects communication network quality information, and calculates and obtains a maximum transmission code rate according to the quantity information and the communication network quality information;
the screen projection control device encodes and compresses the video data, then stamps a Timestamp (Timestamp), and adjusts the Timestamp according to the maximum transmission code rate to obtain a video data packet;
and the device to be displayed supporting screen projection receives and decodes the audio-video data packet, and then synchronously plays the audio-video data packet with the screen projection control device according to the timestamp in the audio-video data packet.
For ease of understanding, the above method will be described below in conjunction with the illustration of fig. 1:
and step S0, the device to be displayed is accessed into a local area network, and the screen projection control device forms communication connection with the device to be displayed through the local area network.
Step S1, the screen projection control device searches for the device to be displayed that supports screen projection.
In step S1, the screen-projection Control device searches for the to-be-displayed device supporting screen projection in the local area network, and establishes a Transmission Control Protocol (TCP) connection with one or more to-be-displayed devices supporting screen projection.
And step S2, the screen projection control device generates the quantity information of the devices to be displayed supporting screen projection, detects the communication network quality information, and calculates and obtains the maximum transmission code rate according to the quantity information and the communication network quality information.
Specifically, in the step S2, the communication Network quality information is Network quality information of the lan, where the Network quality information of the lan includes, but is not limited to, internet Packet explorer (PING) response information and maximum Local Network Bandwidth (Max Local Network Bandwidth). Step S3, the screen projection control device encodes and compresses the video data, then stamps a timestamp, adjusts the maximum transmission code rate to obtain a video data packet, and sends the video data packet to the device supporting screen projection in a User Datagram Protocol (UDP) mode.
Specifically, in step S3, the video and audio data includes video data and/or audio data, that is, when only video needs to be played synchronously, the video and audio data includes only video data; when only audio synchronous playing is needed and video is not displayed, the video and audio data only comprise audio data; when the video synchronous playing and the audio synchronous playing are combined, the video and audio data simultaneously comprise video data and audio data. Certainly, in the process of using the wireless screen projection method, a user may perform specific setting on the video and audio data to be synchronously screen projected or played according to an actual scene and situation, for example, in this embodiment, the video data and the audio data need to be synchronously played.
It should be noted that the number of the video data packets matches the number of the devices to be displayed that support screen projection, and the video data packets and the timestamps are set in a one-to-one correspondence.
Furthermore, the screen projection control device starts at least one Video encoder (Video encoder) to encode and compress Video data in the Video data, and/or starts at least one Audio encoder (Audio encoder) to encode and compress Audio data in the Video data. For example, in the present embodiment, the screen projection control device starts one video encoder to perform simultaneous encoding and compression on one or more video pictures, and starts one audio encoder to perform simultaneous encoding and compression on one or more audios; of course, in order to improve the efficiency of encoding the video and audio data, a plurality of video encoders may be simultaneously activated to respectively decode and compress a plurality of video pictures, and a plurality of audio encoders may be simultaneously activated to simultaneously encode and compress a plurality of audio.
And step S4, the device to be displayed supporting screen projection receives and decodes the video data packet, and then synchronously plays the video data packet and the screen projection control device according to the timestamp in the video data packet.
Specifically, in order to implement low-delay playing of a picture, in step S4, the method further includes feeding back, by the device to be displayed, information about the transmission quality, and the response time of the video data packet to the screen projection control device in real time.
Step S5, the screen projection control device determines whether the transmission of the video data packet is completed according to the information about the transmission quality, the transmission quality and the response time of the video data packet, if so, the screen projection control device returns to step S3 to generate the current video data to be processed into a new video data packet; if not, the audio-visual data to be processed is regarded as outdated audio-visual data, the screen projection control device removes the audio-visual data to be processed until the audio-visual data packet is completely transmitted, and then returns to the step S3 to generate new audio-visual data packets from the audio-visual data generated after the audio-visual data packet is completely transmitted.
Specifically, the step S5 is equivalent to the over-time removing mechanism of the wireless screen projection method, and the setting of the step S5 avoids packaging and sending out outdated audio-video data to the device to be displayed when the network quality is poor, avoids the phenomenon that the screen projection is not synchronous due to the outdated audio-video data played by the device to be displayed, is beneficial to ensuring the synchronous screen projection rate of the audio-video data of the screen projection control device, ensures that the current audio-video data is played in real time, enables the device to be displayed to realize low-delay playing, and effectively improves the use experience of users.
The invention also provides a wireless screen projection system, which comprises a processor and a memory, wherein the memory is stored with a control program for the processor to execute, and the control program realizes the steps of the wireless screen projection method when being executed by the processor.
The invention also provides a computer-readable storage medium, which stores a computer program, which, when executed by a processor, implements the steps of the wireless screen projection method of the invention.
Compared with the prior art, in the wireless screen projection method, the maximum transmission code rate is obtained through calculation according to the quantity information and the communication network quality information, and meanwhile, the screen projection control device adjusts the video data which is subjected to coding compression and time stamping according to the maximum transmission code rate to generate a video data packet; according to the method, the generated video data packet is small, the video data packet is protected to be transmitted under the maximum transmission code rate, the video data transmission rate is improved, real-time transmission of the video data is better realized, and therefore the screen projection synchronization rate is effectively improved.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A wireless screen projection method is applied to a wireless screen projection system, the wireless screen projection system comprises a screen projection control device and at least one device to be displayed, wherein the device to be displayed is in communication connection with the screen projection control device, and the wireless screen projection method is characterized by comprising the following steps:
step S1, the screen projection control device searches the device to be displayed supporting screen projection;
step S2, the screen projection control device generates the quantity information of the device to be displayed supporting screen projection, detects the communication network quality information, and calculates and obtains the maximum transmission code rate according to the quantity information and the communication network quality information;
step S3, the screen projection control device encodes and compresses the video data, stamps a timestamp, and adjusts the maximum transmission code rate to generate a video data packet; the video and audio data comprise video data and/or audio data, the number of the video and audio data packets is matched with the number of the devices to be displayed supporting screen projection, and the video and audio data packets and the time stamps are arranged in a one-to-one correspondence manner;
and step S4, the device to be displayed supporting screen projection receives and decodes the video data packet, and then synchronously plays the video data packet and the screen projection control device according to the timestamp in the video data packet.
2. The wireless screen projection method according to claim 1, further comprising, before the step S1: the device to be displayed is accessed into a local area network, and the screen projection control device is in communication connection with the device to be displayed through the local area network.
3. The wireless screen projection method according to claim 2, wherein in the step S1, the screen projection control device searches for the to-be-displayed device supporting screen projection in the local area network and establishes a TCP connection with one or more of the to-be-displayed devices supporting screen projection.
4. The wireless screen projection method according to claim 3, wherein in the step S2, the communication network quality information is network quality information of the local area network.
5. The wireless screen projection method according to claim 3, wherein in the step S3, the screen projection control device sends the video and audio data packet to the device to be displayed supporting screen projection in a UDP manner.
6. The wireless screen projection method according to claim 3, wherein in step S3, the screen projection control device activates at least one video encoder to encode video data in the video-audio data, and/or activates at least one audio encoder to encode audio data in the video-audio data.
7. The wireless screen projection method according to claim 3, wherein the step S4 further comprises:
the device to be displayed feeds back information about the sending quality, the sending quality and the response time of the video data packet to the screen projection control device in real time;
the following steps are also included after the step S4:
step S5, the screen projection control device determines whether the transmission of the video data packet is completed according to the information about the transmission quality, the transmission quality and the response time of the video data packet, if so, the screen projection control device returns to step S3 to generate the current video data to be processed into a new video data packet; if not, removing the audio-video data to be processed.
8. The wireless screen projection method according to claim 1, wherein the device to be displayed is one or more of a mobile terminal, a display screen and a projector.
9. A wireless screen projection system, comprising a processor and a memory, wherein the memory stores a control program for execution by the processor, and wherein the control program, when executed by the processor, implements the steps of the wireless screen projection method according to any one of claims 1 to 8.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the wireless screen projection method according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010100267.3A CN111263217A (en) | 2020-02-18 | 2020-02-18 | Wireless screen projection method, wireless screen projection system and computer readable storage medium thereof |
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| CN202010100267.3A CN111263217A (en) | 2020-02-18 | 2020-02-18 | Wireless screen projection method, wireless screen projection system and computer readable storage medium thereof |
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| CN112261625A (en) * | 2020-10-09 | 2021-01-22 | Oppo广东移动通信有限公司 | Bit rate adaptive data transmission method and device, equipment and storage medium |
| CN112433690A (en) * | 2020-12-08 | 2021-03-02 | 努比亚技术有限公司 | Data processing method, terminal and computer readable storage medium |
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Application publication date: 20200609 |