CN112311784A - Screen projection system and screen projection method - Google Patents
Screen projection system and screen projection method Download PDFInfo
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- CN112311784A CN112311784A CN202011152776.7A CN202011152776A CN112311784A CN 112311784 A CN112311784 A CN 112311784A CN 202011152776 A CN202011152776 A CN 202011152776A CN 112311784 A CN112311784 A CN 112311784A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000000977 initiatory effect Effects 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000005266 casting Methods 0.000 description 8
- 230000006399 behavior Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/1059—End-user terminal functionalities specially adapted for real-time communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/1063—Application servers providing network services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/40—Support for services or applications
- H04L65/403—Arrangements for multi-party communication, e.g. for conferences
- H04L65/4038—Arrangements for multi-party communication, e.g. for conferences with floor control
Abstract
The invention provides a screen projection system and a screen projection method, and belongs to the technical field of wireless screen projection. The screen projection system comprises a server, a client and a web browser operation end, wherein the server comprises an application server and an SR module, the application server is used for recording user information, forwarding and integrating screen projection information and storing file description after screen projection, and the SR module is used for transferring and transmitting data streams of the client and the screen projection end; the user side is a screen projection end or a receiving end, and comprises an MDS module which is used for information transmission and communication between the user side and the SR module; all operations of the system, including screen projection, receiving, screen projection stopping, screen projection group quitting and the like, are realized on the web browser operation end. The screen projection method comprises a screen projection initiating method and a screen projection stopping method.
Description
Technical Field
The invention belongs to the technical field of screen projection, and particularly relates to a screen projection system and a screen projection method.
Background
In the screen projection forwarding system existing in the market at present, a certain delay exists between screen projection and receiving. That is, the flow of the screen-projection end picture is asynchronous with the flow of the receiving end picture, and delay of tens of seconds or even minutes exists. The screen-casting system cannot be opened at any time, and the screen can be cast at any time. And the screen projection end and the receiving end are equal in grade, and the controllable screen projection in the same screen projection system cannot be realized. It is also inconvenient to share the screen at the same time during the discussion process. In addition, during the screen-shot discussion, the software on the market hardly improves the holding and transmission of the conference or discussion files.
Disclosure of Invention
The present invention provides a screen projection system and a screen projection method, which aims to solve the technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a screen projection system comprises a server, a client, a white board and a Web browser operation end; the server comprises an application server and an SR module, wherein the application server is used for recording user information, forwarding and integrating screen projection information and storing file records generated during screen projection, and the SR module is used for unloading and transmitting data streams of a user side; the user side is a screen projection end or a receiving end, the screen projection end projects a screen image of the screen projection end to one or more receiving ends, or the screen projection end projects the screen image of the screen projection end to the white board; the user side comprises an MDS module, and the MDS module is used for information transmission and communication between the user side and the SR module; the user terminals participating in screen projection of the screen projection system comprise different screen projection groups consisting of a plurality of different screen projection terminals, and each screen projection group is logically separated and does not interfere with each other; the whiteboard comprises the MDS module and is used for receiving screen mirror image delivery of one or more user sides; the Web browser operation end is used for displaying all the user ends participating in screen projection, and performing screen projection, screen receiving, screen projection stopping and screen projection group exiting operations.
The invention also provides a screen projection method, which comprises a screen projection initiating method and a screen projection stopping method,
the screen projection initiating method comprises the following steps:
a1. the screen projection end initiates a screen projection request to an application server through a Web browser operation end;
a2. the application server receives the request and orders the MDS module of the screen projection end to prepare for screen projection;
a3. the screen projection end MDS module requests the SR module to project a screen;
the SR module forwards the screen projection request to each receiving terminal;
a5. the receiving end responds to the request and sends the response request back to the MDS module of the screen throwing end through the SR module, and the SR module establishes TCP connection with all terminals in the receiving end list to prepare for data transmission;
a6. the screen projecting end MDS module starts audio and video coding and sends data to the SR module;
after the SR module receives the data, forwarding the received data through the established channel according to the receiving end list;
a8. the receiving end MDS module obtains data and then encodes and analyzes the data into video and audio for display;
the screen projection stopping method comprises the following steps:
b1. a screen projection end user initiates a stop request to an application server through a Web browser operation end;
b2. the application server receives the request and orders the MDS module of the screen projection end to stop projecting the screen;
b3, stopping encoding by the MDS module;
the MDS module sends a screen-throwing stopping request to the SR module;
the SR module forwards a screen-projection stopping request to all receiving ends in the receiving end list;
b6. each receiving end stops receiving data and closes the picture.
Preferably, in step a6, the encoding method of the projection MDS module is as follows: intercepting the desktop of the screen projection end by using each frame of a windows GUI technology, wherein the maximum interception speed is 20 frames/second, converting each frame of intercepted picture into H264 video format data, taking a PCM audio source through a sound card, converting the PCM audio source into AAC audio coding format data and current mouse position information, and sending mixed stream data once every 50ms through a data channel established by an MDS module and an SR module of the screen projection end.
Preferably, in step a8, the method for analyzing the codes of the MDS module at the receiving end is as follows: the receiving end is provided with a buffer area for receiving screen projection information forwarded by the SR module, video, audio and mouse coordinate data are stripped according to data header information and are respectively processed, the MDS module of the receiving end fetches data in the buffer area, the fetched data are subjected to self-adaptive playing at the fastest speed of 60 frames/S, and the number of frames of the playing end is higher than that of the sending end, so that frames can be guaranteed not to be lost under the condition of network blockage.
Preferably, each screen projection terminal/receiving terminal can log in through a random login code and an account number of the web browser operation terminal, and can also log in through a configured account number.
Preferably, SR modules may be respectively deployed at different spatial locations to accelerate the data forwarding process as long as the space is reachable by the wireless local area network.
Preferably, the MDS module includes a data clearing unit.
After the technical scheme is adopted, the invention has the following advantages:
the screen projecting system and the screen projecting method are more convenient and have low delay.
Drawings
FIG. 1 is a flowchart of a screen projection initiating method of the screen projection system of the present invention;
FIG. 2 is a flowchart of a screen-projection stopping method of the screen projection system according to the present invention;
FIG. 3 is a topology diagram of a screen projection system of the present invention;
in the figure:
1-a server; 101-an application server; 102-SR module; 2-a user terminal; 21-screen projection end; 22-a receiving end; 201-an MDS module; and 3-white board.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples.
As shown in fig. 1-3, the present invention provides a screen projection system, which includes a server 1, a client 2, a whiteboard 3, and a Web browser console.
The server 1 includes an application server 101 and an SR module 102, where the application server 101 is configured to record user information, forward and integrate screen-casting information, and store a file description after screen casting, and the SR module 102 is configured to store a data stream between the sending user terminal 2 and the sending terminal. The user side 2 is a screen projection end 21 or a receiving end 22, the screen projection end 21 projects the screen image of the screen projection end 21 to one or more receiving ends 22, or the screen projection end 21 projects the screen image of the screen projection end 21 to the whiteboard 3; the user terminal 2 comprises an MDS module 201, and the MDS module 201 is used for information transmission and communication between the user terminal 2 and the SR module 102; the user end 2 participating in screen projection of the screen projection system comprises different screen projection groups consisting of a plurality of screen projection ends 21, and each screen projection group is logically separated and does not interfere with each other; the whiteboard 3 comprises the MDS module 201, which is used for receiving screen image delivery of one or more user terminals 2; the Web browser operation end is used for displaying all the user ends 2 participating in screen projection, and performing screen projection, receiving screen projection, stopping screen projection and quitting screen projection group operation.
The invention also provides a screen projection method, which comprises a screen projection initiating method and a screen projection stopping method,
the screen projection initiating method comprises the following steps:
a1. the screen projection terminal 21 initiates a screen projection request to the application server 101 through the Web browser operation terminal;
a2. the application server 101 receives the request and commands the screen-casting terminal 21MDS module 201 to prepare for screen casting;
a3. the screen projection end 21MDS module 201 requests the SR module 102 to project a screen;
the sr module 102 forwards the screen projection request to each receiving end 22;
a5. the receiving end 22 responds to the request, and sends the response request back to the MDS module 201 of the screen projection end 21 through the SR module 102, and the SR module 102 establishes TCP connections with all terminals in the list of the receiving end 22 to prepare for data transmission;
a6. the screen projecting end 21MDS module 201 starts audio and video coding and sends data to the SR module 102;
after receiving the data, sr module 102 forwards the received data through the established channel according to the receiving end 22 list;
a8. the receiving end 22MDS module 201 obtains data and then encodes and analyzes the data into video and audio for display;
the screen projection stopping method comprises the following steps:
b1. a user of the screen projection terminal 21 initiates a stop request to the application server 101 through the Web browser operation terminal;
b2. the application server 101 receives the request and commands the screen projection terminal 21MDS module 201 to stop screen projection;
the mds module 201 sends a screen-projection stopping request to the SR module 102;
the sr module 102 forwards a screen-projection stopping request to the receiving end 22;
b6. each receiver 22 stops receiving data and closes the screen.
The screen projection end 21 user initiates a screen projection http request to the application server through the Web browser operation end. The application server 101 receives the request, analyzes the request information, and initiates a ready screen-casting command to the MDS module 201 of the screen casting terminal 21. The MDS module 201 requests a screen projection from a screen projection stream forwarding server (hereinafter referred to as SR module 102), and the SR module 102 forwards the screen projection request to each receiving terminal 22. The receiving end 22 responds to the received screen projection information request, and sends a response request back to the MDS module 201 of the screen projection end 21 through the SR module 102.
The MDS module 201 starts to perform audio and video coding (including a mouse position) on screen projection equipment (PC), each frame of the screen projection equipment (PC) is used for intercepting a desktop of a screen projection end, each frame of the intercepted frame is converted into H264 video format data, a PCM audio source is taken by a sound card and converted into AAC audio coding format data, the mouse position data is obtained, mixed stream data is intercepted every 50ms through a data channel established by the MDS module 201 of the screen projection end 21 and the SR module 102, and the data of 20 frames is intercepted every second. The data of the picture and the audio and the coordinate data of the mouse are sent to the SR module 102, the SR module 102 does not perform any processing and respectively sends the data to the MDS modules 201 of the receiving terminals 22, the MDS modules 201 of the receiving terminals 22 perform data analysis, and in the processing of analyzing the data, the coordinate data of the video, the audio and the mouse are stripped according to the data header information and are respectively processed. The receiving end 22 is provided with a buffer area for receiving the screen projection information forwarded by the SR module 102, the receiving end 22MDS module 201 reads data in the buffer area, and the obtained data is played at a speed of 60 frames/S.
If the screen projection end 21 is blocked by the network, part of data is accumulated, audio and video playing of the receiving end 22 is accelerated, and any information cannot be lost. After the processing, the data before and after the played video information and audio information does not exceed 30ms, and the sound and picture synchronization is basically realized.
If network congestion occurs, the frame rate of the receiving end 22 is higher than that of the transmitting end due to the fact that the frame number of the receiving end 22 is inconsistent with that of the transmitting end, and the playing speed of the receiving end 22 can be increased within the same time, so that the frame skipping is prevented. This step is "asymmetric framesync". The mouse information only records the x and y coordinate information of the mouse at the screen projection end, and the mouse is drawn to the position of the screen projection end 21 through the drawing technology.
In the same local area network range, a user can open the screen projecting system through a browser by means of a portable computer terminal, a conference space is opened at any time, screen projection is performed for study, and switching of different screen projectors is freely realized.
Each screen projection end 21/receiving end 22 logs in through the random login code and the account number, the login codes of the same screen projection end 21/receiving end 22 participating in screen projection are the same, each screen projection end 21/receiving end 22 is an independent user end, and the behaviors of all the user ends in the same group cannot affect other users. Different groups of screen projection terminals 21/receiving terminals 22 have different login codes, so that the logical grouping is realized.
In order to improve the data transmission efficiency, different streaming data forwarding Services (SR) can be deployed in different spaces, classrooms or floors, so that the image fluency can be effectively improved, the number of users can be increased, and the network bandwidth occupation of the users can be reduced.
The picture of the sending end is converted into an H264 video format, so that the code rate is stably kept at 200kB/s, the limitation of a user broadband is reduced, and meanwhile, the utilization rate of a CPU is reduced to about 20% by the coding mode.
Under the condition of using the whiteboard 3, screens of a plurality of screen projection terminals can be uniformly projected onto the whiteboard 3 screen for comparison. Particularly, in team communication, the efficiency of comparison and discussion can be obviously improved.
In the process of screen projecting the whiteboard 3, the user can perform circle-point, annotation or screen capturing on the projected content, and after the screen projecting is finished, the user can select to store the screen capturing and annotation content in the screen projecting process into a document in a PDF format. Members who are the same as the current screen-projection team can download the document.
In the process of using the white board 3, the screen projection end is a computer, and the white board 3 can reversely control the computer screen. Therefore, in a team meeting, a speaker can reversely control the screen according to the screen projection content.
In the screen projection process using the whiteboard 3, a user who hosts the conference can designate any one of the team members to project the screen. The screen can be projected to the white board 3, or the designated screen can be projected to the computer screens of all the conference members.
In the multiple-group discussion, the screen projection process using the plurality of whiteboards 3 is divided into a main whiteboard and a group whiteboard.
Each whiteboard corresponds to a different discussion group, and each team member can project the own equipment screen into the corresponding team whiteboard.
The moderator can specify the screen of a certain team member to be projected on the main screen or the computers of all the members. The discussion efficiency is improved.
The invention also provides functions of voting, selecting, answering and the like, and increases the interest and diversity of discussion in the discussion process.
Under the condition of using the white board 3, the screen projection of the mobile phone can be supported, the screen projection of the computer can also be supported, and the function that the screen is projected to the white board by the mobile phone and the computer at the same time can also be supported. And enriching picture contrast. More freedom and no restriction.
In the process of projecting the screen to the white board 3 by the mobile phone, the white board 3 is not supported to reversely control the screen of the mobile phone for the privacy of the user.
And in any screen projection process, uploading and downloading of files among users are supported.
After the conference is finished, in order to protect privacy, the MDS module 201 has a data clearing function, and can automatically clear the content generated by the screen-casting.
Other embodiments of the present invention than the preferred embodiments described above will be apparent to those skilled in the art from the present invention, and various changes and modifications can be made therein without departing from the spirit of the present invention as defined in the appended claims.
Claims (7)
1. A screen projection system is characterized in that,
the system comprises a server (1), a client (2), a whiteboard (3) and a Web browser operation end; the server (1) comprises an application server (101) and an SR module (102), wherein the application server (101) is used for recording user information, forwarding and integrating screen projection information and storing file records generated during screen projection, and the SR module (102) is used for unloading data streams of a sending user side (2);
the user side (2) is a screen projection end (21) or a receiving end (22), the screen projection end (21) projects the screen mirror image of the screen projection end (21) to one or more receiving ends (22), or the screen projection end (21) projects the screen mirror image of the screen projection end (21) to the whiteboard; the user side (2) comprises an MDS module (201), and the MDS module (201) is used for information transmission and communication between the user side (2) and the SR module (102); the user end (2) participating in screen projection of the screen projection system comprises screen projection groups consisting of a plurality of different screen projection ends (21), and each screen projection group is logically separated and does not interfere with each other;
the white board (3) is used for receiving screen mirror image delivery of one or more user sides (2);
the Web browser operation end is used for displaying all the user ends (2) participating in screen projection, and performing screen projection, receiving screen projection, stopping screen projection and quitting screen projection group operation.
2. A screen projection method is characterized by comprising a screen projection initiating method and a screen projection stopping method,
the screen projection initiating method comprises the following steps:
a1. a screen projection end (21) initiates a screen projection request to an application server (101) through a Web browser operation end;
a2. the application server (101) receives the request and commands the screen projection end (21) to prepare for screen projection by the MDS module (201);
a3. the screen projection end (21) is used for requesting screen projection from the SR module (102) by the MDS module (201);
the SR module (102) forwards the screen projection request to each receiving end (22);
a5. the receiving terminal (22) responds to the request, and sends the response request back to the MDS module (201) of the screen projection terminal (21) through the SR module (102), and the SR module (102) establishes TCP connection with all terminals in a list of the receiving terminal (22) to prepare for data transmission;
a6. the screen projection end (21) starts audio and video coding by the MDS module (201), and sends data to the SR module (102);
after receiving the data, the SR module (102) forwards the received data through the established channel according to the receiving end (22) list;
a8. the MDS module (201) of the receiving end (22) acquires data and then decodes the data into video and audio for display;
the screen projection stopping method comprises the following steps:
b1. a screen projection end (21) user initiates a stop request to an application server (101) through a Web browser operation end;
b2. the application server (101) receives the request and commands the screen projection end (21) to stop screen projection by the MDS module (201);
b3. the MDS module (201) stops encoding;
the MDS module (201) sends a screen-throwing stopping request to the SR module (102);
the SR module (102) forwards a screen-projection stopping request to all receiving terminals (22) in the receiving terminal (22) list;
b6. each receiving end (22) stops receiving data and closes the screen.
3. A method as claimed in claim 2, wherein in step a6, the MDS module (201) at the screen projection end (21) is encoded by: the desktop of the screen projection end (21) is intercepted by using a windows GUI technology, the maximum interception speed is 20 frames/second, each frame of intercepted picture is converted into H264 video format data, a PCM audio source is taken through a sound card and is converted into AAC audio coding format data and current mouse position information, and mixed stream data is sent once every 50ms through a data channel established by an MDS module (201) and an SR module (102) of the screen projection end (21).
4. A screen projection method as claimed in claim 2, wherein in step a8, the decoding method of the MDS module (201) at the receiving end (22) is: the receiving end (22) is provided with a buffer area for receiving screen projection information forwarded by the SR module (102), video, audio and mouse coordinate data are stripped according to data header information and are processed respectively, the receiving end (22) MDS module (201) fetches data in the buffer area, the fetched data is played in a self-adaptive mode at the fastest speed of 60 frames/second, and the number of frames of the playing end is higher than that of the sending end, so that frames can be guaranteed not to be lost under the condition of network blocking.
5. The screen projection method of claim 2, wherein each screen projection terminal (21)/receiving terminal (22) can log in through a random login code and an account number of a web browser operation terminal, and can also log in through a configured account number.
6. The screen projection method as claimed in claim 2, wherein SR modules (102) can be deployed at different spatial positions to accelerate the data forwarding process as long as the space is accessible to the wireless local area network.
7. A method as claimed in claim 2, wherein the MDS module (201) comprises a data clearing unit.
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| CN202011152776.7A CN112311784A (en) | 2020-10-26 | 2020-10-26 | Screen projection system and screen projection method |
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| CN202011152776.7A CN112311784A (en) | 2020-10-26 | 2020-10-26 | Screen projection system and screen projection method |
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Application publication date: 20210202 |