CN102883134A - Screen sharing and controlling method for video conference system - Google Patents
Screen sharing and controlling method for video conference system Download PDFInfo
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- CN102883134A CN102883134A CN2012104306924A CN201210430692A CN102883134A CN 102883134 A CN102883134 A CN 102883134A CN 2012104306924 A CN2012104306924 A CN 2012104306924A CN 201210430692 A CN201210430692 A CN 201210430692A CN 102883134 A CN102883134 A CN 102883134A
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Abstract
The invention relates to a computer data sharing technology, in particular to a screen sharing and controlling method for a video conference system. According to the scheme of the invention, the screen sharing and controlling method mainly comprises the following steps: a video conference terminal and a server establish communication connection with a screen, a screen sharing device and the server establish a video transmission channel, the screen sharing device collects the screen sharing data per se and sending the screen sharing data to the video conference terminal; the video conference terminal copies the received screen sharing data and forwards to the server; the server sends the screen sharing data to the screen sharing device; and finally screen sharing device receives and displays the screen sharing data. The screen sharing and controlling method for the video conference system has the advantages that: a plurality of PC desktops and mobile device desktops can be shared at the same time in the video conference, and other users can remotely adjust the resolution and other parameters of the device terminal in the parameter setting mode in the video conference. The screen sharing and controlling method is particularly suitable for the video conference system.
Description
Technical field
The present invention relates to the computer data technology of sharing, relate to specifically a kind of Screen sharing for video conferencing system and control method.
Background technology
Along with the development of information technology, network has become the important means of Information Communication.Interactive as a kind of new interactive mode based on Long-distance Control and operation, allow the user not need on the spot in personly just can realize identical interaction, the watching and operating of strange land.Wherein to share be a kind of important application in the data sharing to desktop, being often used in especially document and showing, operate demonstration, synergetic office work etc. in the disparate networks communication systems such as the network teleconference, IM immediate communication tool, is that the interactive modes such as audio frequency and video, text message are important and effectively additional.
The Screen sharing technology of the uses such as mostly video conference, IM immediate communication tool is to adopt the process implementation of common screenshot capture, local coder, transmission on-screen data, far-end decoding, distal displayed at present.
Be the Chinese patent of 200910189480.x such as application number, main technical schemes is to send the desktop request command to controlled terminal by main control end, controlled terminal is after receiving desktop and sharing, and the content that current screen content and screen display are upgraded sends to the opposite end in real time, realizes Screen sharing.
And for example application number is 200810220423.9 Chinese patent, thereby main technical schemes is by line end carries out mouse message collection, desktop picture collection, compression coding image, piecemeal, packing, transmission packet to MCU, MCU to control end and the beholder holds transmission image, control end to realize the shared and Long-distance Control of screen to the control command that MCU sends control command, MCU forwarding control command, shared line end execution response to sharing.
The Screen sharing of other some comparative maturities and control tool such as VNC, mainly by a service end, a plurality of clients form.VNC gathers the image change part for passing through to gather desktop picture when gathering, be sent to client, and client is decoded and shown or transmission order control.
These traditional Screen sharing technology, system or instruments all can only be realized the Screen sharing of current shared line end the machine on Screen sharing, i.e. shared line end, and a plurality of beholders' pattern is quite limited to its application in video conference.And along with the high speed development of information system with business, a traditional shared line end, a plurality of beholders' pattern can not have been met consumers' demand again, and the pattern that needs a plurality of shared line ends, a plurality of beholder to check arbitrarily.
And present HDMI high definition share desktop: be mainly used at present some video conference fields, be mainly seen in Polycom, Warburg Pincus etc.It mainly is to fill a high definition capture card of supporting the HDMI interface at video conference terminal, to dock with employing high definition HDMI lines such as the PC of HDMI interface, notebook computers, then by desktop expansion display mode, desktop is simultaneously displayed on current screen and the video conference terminal video frequency collection card.Video conference terminal then is broadcast to other users in the video conference with screen with one road video mode.Although HDMI high definition share desktop can provide a plurality of PC desktops to share by increasing the capture card mode, there are many limitation in it, comprising: the PC of the shared screen of needs must support the HDMI interface, and at present on the market more PC or notebook all without this interface; The limited length of HDMI line, and PC is constant with being connected of terminal, has larger limitation; Every support one road PC access of video conference terminal need fill a video frequency collection card, need fill many when needing the access multichannel, thereby improve dramatically cost.
Therefore present Screen sharing technology all can not satisfy the needs of video conferencing system.
Summary of the invention
Technical problem to be solved by this invention is exactly for the deficiencies in the prior art, proposes a kind of Screen sharing and control method for video conferencing system.
The present invention solves the problems of the technologies described above the technical scheme that adopts: be used for Screen sharing and the control method of video conferencing system, it is characterized in that, may further comprise the steps:
A. video conference terminal and server and Screen sharing equipment establish a communications link, and described Screen sharing equipment is one or more in PC, notebook computer, smart mobile phone and the panel computer;
B. Screen sharing equipment and server are set up the transmission of video passage;
C. video conference terminal receives the Screen sharing control command that the user sends;
D. select and arrange Screen sharing equipment according to the Screen sharing control command, Screen sharing equipment gathers self Screen sharing data, and the Screen sharing data that collect are sent to video conference terminal;
E. video conference terminal copies and is transmitted to server with the Screen sharing data that receive;
F. server sends to Screen sharing equipment with the Screen sharing data;
G. Screen sharing equipment receives and the shared data of display screen.
Concrete, step a is further comprising the steps of:
A1. video conference terminal is set up the network service Connection Service, provides port for the Screen sharing equipment connection that needs to share screen;
A2. video conferencing system is by the network connection service device, and verifies in connection procedure, if be proved to be successful, then be connected with the server service of setting up and enter step a3, if authentication failed then disconnects, describedly is connected to wired and/or wireless connections;
A3. video conference terminal creates abstract video data objects, and the video of connection server is transmitted service.
Concrete, step b is further comprising the steps of:
B1. the signal of Screen sharing equipment receiver, video conference terminal judges whether video conference terminal is connected to the video forwarding service of server, if, then enter step b2, if not, then do not deal with;
B2. Screen sharing device initialize local video collector and encoder are set up the transmission of video passage with server.
Concrete, step b2 is further comprising the steps of:
B21. judge whether the user specifies shared screen area voluntarily, if, then enter step b22, if not, then be defaulted as full frame sharing and the initialization video collector;
B22. receive and resolve the Screen sharing zone of user's input, and the initialization video collector.
Concrete, described transmission of video passage is the data transmission channel according to TCP or the foundation of UDP host-host protocol.
In Screen sharing facility information, Screen sharing device screen resolution, Screen sharing scope, coded format and the transmission of video code check that concrete, described Screen sharing control command comprises the Screen sharing facility information that provides shared, receive the information of sharing one or more.
Concrete, step c is further comprising the steps of:
C1. the Screen sharing control command that video conference terminal receives and analysis user is sent, parse the address of the Screen sharing equipment that provides shared and the address that the Screen sharing equipment of information is shared in reception, described the address of shared Screen sharing equipment is provided is one or more, and the address that the Screen sharing equipment of information is shared in described reception is one or more;
C2. the video conference terminal address that will receive the Screen sharing equipment of the information of sharing sends to server;
C3. the server address that set up to receive tabulation and will receive the Screen sharing equipment of the information of sharing is stored in to receive and tabulates.
Concrete, steps d is further comprising the steps of:
D1. video conference terminal obtains the resolution information that Screen sharing equipment is supported, and compare with resolution that video conference terminal is supported, draw the resolution information group that video conference terminal support and Screen sharing equipment are also supported, the resolution information group is sent to server;
D2. server feeds back to the user with the resolution information group, the user carries out the setting of Screen sharing parameter according to the resolution information group, and described parameter setting comprises one or more in terminal point coordinate, Screen sharing compression coding mode and the Screen sharing code check of origin coordinates that screen resolution, screen pick up, screen scraping;
D3. server sends to video conference terminal with user's parameter setting information, and video conference terminal is transmitted to it shares the display device execution.
Concrete, step f is further comprising the steps of:
F1. server reads the Screen sharing device address that receives in the tabulation;
F2. video is shared data based Screen sharing device address and send to all Screen sharing equipment.
Concrete, step g is further comprising the steps of:
G1. Screen sharing equipment is judged reception and is resolved the Screen sharing data, whether the Screen sharing data of judging current reception have comprised a plurality of Screen sharing device screen data, if judge that the current screen shared device is one, then directly the shared terminal on-screen data is presented on the screen, if judge that the current screen shared device is a plurality of, then enter step g 2;
G2. all Screen sharing device screen data all are presented on the screen, carry out selectivity according to the control command of user's input and show.
Beneficial effect of the present invention is, be implemented in the video conference, can share simultaneously a plurality of PC desktops and mobile device desktop, simultaneously in video conference, other users can pass through the parameter set-up mode, the parameters such as resolution of long-range adjustment device end, and can in same screen, show simultaneously the equipment desktop of a plurality of share desktops, full frame any one share desktop that zooms in or out satisfies the shared demand of multiple desktop screen in the video conference fast and easily.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is video conference terminal and Screen sharing equipment connection flow chart;
Fig. 3 is Screen sharing equipment end initialization video collector flow chart;
Fig. 4 is video conference terminal initialization Screen sharing equipment flowsheet;
Fig. 5 is the long-range Screen sharing parameter flow chart that arranges of user.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail:
The present invention proposes to be used for Screen sharing and the control method of video conferencing system, mainly may further comprise the steps: at first video conference terminal and server and Screen sharing equipment establish a communications link, the communication connection here refers to set up communication connection by wired and/or wireless network, and Screen sharing equipment is one or more in PC, notebook computer, smart mobile phone and the panel computer; Screen sharing equipment and server are set up the transmission of video passage; Video conference terminal receives the Screen sharing control command that the user sends; Select and arrange Screen sharing equipment according to the Screen sharing control command, Screen sharing equipment gathers self Screen sharing data, and the Screen sharing data that collect are sent to video conference terminal; Video conference terminal copies and is transmitted to server with the Screen sharing data that receive, the purpose that video conference terminal copies is and can carries out fec decoder to the data that receive, after finishing, fec decoder carries out uncompressed encoding work, obtain decoded video data stream and can carry out this locality broadcast, thereby make this locality can watch shared screen video information; Server sends to Screen sharing equipment with the Screen sharing data; Last Screen sharing equipment receives and display screen is shared data.
For the total technical scheme of more detailed description the present invention, set forth below by a concrete video conferencing system, as shown in Figure 1, be a kind of concrete video conference terminal and the structural representation of server and Screen sharing equipment connection, wherein server is comprised of Windows Client and MCU, in this structure, when checking the terminal video by Windows Client by the forwarding of MCU, can select the desktop data message of the equipment of checking 1, equipment 2 and equipment 3, and can carry out corresponding remote control operation according to mandate.Equipment 1, equipment 2 and equipment 3 also can be accessed by Windows Client simultaneously, the interface of access device 1, equipment 2, equipment 3 when terminal is accessed Windows Client by the MCU special secondary school.
The total technical scheme according to the present invention, the mode that syndeton described in Fig. 1 is carried out Screen sharing is, at first share order by the one or more initiation videos in equipment 1, equipment 2 and the equipment 3, terminal is carried out self on-screen data collection according to sharing one or more in command selection equipment 1, equipment 2 and the equipment 3, the shared data that collect are sent to terminal, send to MCU after being copied by terminal, last MCU will share data retransmission to the equipment of initiating video and share order.
The mode that a kind of concrete video conference terminal and server and Screen sharing equipment establish a communications link is:
As shown in Figure 2, at first video conference terminal is set up the network service Connection Service, provide port for the Screen sharing equipment connection that needs to share screen, as setting up network communication Connection Service SocketServer at existing video conference terminal equipment, and startup SocketServer service, the open service port connects for the PC service that needs to share screen, and the equipment of then sharing at needs creates Socket and connects; Then video conferencing system is by the network connection service device, be mainly by IP network and be connected to the SocketServer server, and carry out the video conference terminal access authentication, a kind of concrete authentication mode is that terminal is set up corresponding password or the key of connecting when starting SocketServer, when equipment connects video conference terminal equipment SocketServer in access, sending corresponding password verifies, being proved to be successful rear foundation service connects, during authentication failed, the video conference terminal off device connects, refusal equipment connection request describedly is connected to wired and/or wireless connections; The final video conference terminal creates abstract video data objects, and the video of connection server is transmitted service, it is identical with the concrete camera data object establishment in the video conferencing system to create abstract video data objects, have identical behavior and attribute, but its behavior is different from the imbody mode of attribute.When difference is to start concrete camera collection video data, its behavior is embodied as calls video frequency collection card, by the camera collection image information, return video conferencing system, and need receive the data that the desktop shared device sends during abstract video data objects image data and transmit.Also there are some differences in its camera relative parameters setting and screen control associative operation attribute and behavior, at last when video conferencing system after the success of MCU registration video data information, send the video data message that succeeds in registration to waiting to share the screen equipment end.
The method that a kind of concrete Screen sharing equipment and server are set up the transmission of video passage is:
At first the signal of Screen sharing equipment receiver, video conference terminal judges whether video conference terminal is connected to the video forwarding service of server, if, then Screen sharing device initialize local video collector and encoder, set up the transmission of video passage with server, if not, then do not process.Wherein video collector is a kind of general screen video acquisition technique, by fixed frequency screen is carried out picture and shears collection, each frame is carried out data buffering form the collection that video flowing is realized video data.Fixed frequency refers to that per second gathers the quantity of screen shots, and is logical by user's appointment, adopts default value in the unspecified situation of user.Fixed frequency is higher, and the video of collection is more smooth, and bandwidth occupancy is also higher simultaneously.Before encoder refers to the video network transmission, the desktop that gathers is shared the encoder that video flowing carries out video compression, coding.Encoder adopts current techique and agreement, mainly comprises H264, X264, MPEG4 etc.
A kind of method of concrete Screen sharing device initialize local video collector is:
Judge at first whether the user specifies shared screen area voluntarily, if the Screen sharing that then receives and resolve user's input is regional, if not, then be defaulted as full frame sharing and the initialization video collector.
As shown in Figure 3, a kind of flow process of concrete Screen sharing equipment end initialization video collector is: after the Screen sharing equipment end receives terminal point virtual video object initialization success message and virtual video object information, start the local video collecting thread, then obtain the resolution in the virtual video information, according to the resolution that gets access to local resolution is set, then initialization desktop screen is shared acquisition target (comprising acquisition range, coded format and code check etc.), and last notification terminal equipment video initialization success is also set up the video communication passage.
A kind of scheme is, described transmission of video passage is the data transmission channel of setting up according to TCP or UDP host-host protocol, and generally video conference terminal and the equipment of waiting to share screen are in same local area network (LAN), and network transfer speeds is higher, packet loss is low, and acquiescence adopts TCP to connect transmission.But the user also can follow factually border demand, selects UDP or TCP transmission.
In Screen sharing facility information, Screen sharing device screen resolution, Screen sharing scope, coded format and the transmission of video code check that concrete, described Screen sharing control command comprises the Screen sharing facility information that provides shared, receive the information of sharing one or more.
The method of the Screen sharing control command that a kind of concrete video conference terminal reception user sends is:
The Screen sharing control command that video conference terminal receives and analysis user is sent, parse the address of the Screen sharing facility information that provides shared and the address that the Screen sharing facility information of information is shared in reception, the described address that is enhanced shared Screen sharing equipment is one or more, and the address that the Screen sharing equipment of information is shared in described reception is one or more; Then video conference terminal will receive the address of sharing the information screen shared device and send to server; Last server is set up the address that receives tabulation and will receive the Screen sharing equipment of the information of sharing and is stored in to receive and tabulates.The purpose of this programme is to improve a kind of a plurality of Screen sharing equipment and shares simultaneously screen, and has a plurality of receiving equipments to receive the solution of sharing screen message.
A kind of concrete Screen sharing equipment method to set up is:
At first video conference terminal obtains the resolution information that Screen sharing equipment is supported, and compare with resolution that video conference terminal is supported, draw the resolution information group that video conference terminal support and Screen sharing equipment are also supported, the resolution information group is sent to server; Then server feeds back to the user with the resolution information group, the user carries out the setting of Screen sharing parameter according to the resolution information group, and described parameter setting comprises one or more in terminal point coordinate, Screen sharing compression coding mode and the Screen sharing code check of origin coordinates that screen resolution, screen pick up, screen scraping; Last server sends to video conference terminal with user's parameter setting information, and video conference terminal is transmitted to it shares the display device execution.
The flow process of concrete video conference terminal initialization Screen sharing equipment as shown in Figure 4, when Screen sharing equipment is connected with video conference terminal, video conference terminal receives the authentication password of screen shared device, after checking is passed through, at this locality establishment video information object and to video connection data of MCU server log, such as LoginMediaServer, then terminal is obtained registration MCU result, if failure, then notification screen shared device so MCU registration failure and cause sharing unsuccessfully, if succeed in registration, then terminal is obtained resolution from the Screen sharing device end, then obtain the resolution that video conferencing system is supported this equipment according to the resolution of terminal support, follow initialization video conference information, comprise resolution, coded format and code check etc., last notification screen shared device video initialization successfully reaches initialization information.
The flow process that the user is long-range to arrange the Screen sharing parameter as shown in Figure 5, when setting is shared screen resolution, obtain request to the resolution of MCU initiation screen support first, MCU is transmitted to the video conference terminal that connects Screen sharing with the screen resolution request, and video conference terminal sends to order the equipment end of sharing screen.Equipment end is obtained the screen resolution data message that local device supports and is sent to the video conference terminal that is connected with this equipment.Video conference terminal receives the resolution of supporting with video conferencing system behind the facility information and compares, draw the resolution information group that video conferencing system support and Screen sharing equipment also supports and send to the MCU server, the MCU server is forwarded to resolution information the video conference client of request resolution data.After getting access to the resolution that can arrange, the parameter information of Screen sharing is arranged, and the information after will arranging sends to the MCU server end.Wherein the setting of Screen sharing parameter comprises: the origin coordinates that screen resolution, screen are picked up, the terminal point coordinate of screen scraping, Screen sharing compression coding mode, Screen sharing code check arrange etc.Last MCU receives information and the order of video conference client transmission and is transmitted to the video conference terminal that is connected with Screen sharing.Video conference terminal receives after the order and with order and is transmitted to Screen sharing equipment, and Screen sharing equipment is carried out related command.
When Screen sharing equipment is carried out related command in the step 28, step 27, need to check the parameter situation of change, unchanged parameter is not processed; Varying parameters is carried out the Screen sharing collection to be reinitialized; The setting of invocation facility resolution changing is carried out in the resolution setting
The method that a kind of concrete server carries out the transmission of Screen sharing data is:
At first server reads the Screen sharing device address that receives in the tabulation; Then video is shared data based Screen sharing equipment place and send to all Screen sharing equipment.
A kind of concrete Screen sharing equipment receives and the method for the shared data of display screen is:
At first Screen sharing equipment is judged reception and is resolved the Screen sharing data, whether the Screen sharing data of judging current reception have comprised a plurality of Screen sharing device screen data, if judge that the current screen shared device is one, then directly the shared terminal on-screen data is presented on the screen, if judge that the current screen shared device is a plurality of, then all Screen sharing device screen data all are presented on the screen, carry out selectivity according to the control command of user's input and show.The selectivity demonstration refers to that the user can control current same screen and present a plurality of shared screen videos in the formed objects mode, and can change arbitrarily the position that screen presents.Also can focus on shared screen video of larger demonstration at current screen, other screen videos of sharing show in less mode.Can also be displayed in full screen simultaneously the screen video that any one is shared.And same screen is when the video stream that display screen is shared, and also other information of display video meeting simultaneously comprise: other videos, electronic whiteboard, text chat, document sharing, multimedia are shared etc.
When the user obtains Screen sharing information, the screen resolution of all right Remote Acquisitioning and modification Screen sharing equipment, and the parameter of energy remotely modifying screen capture device, certainly for the ease of management control, the user terminal that can be respectively different arranges different authorities, retrains its control authority in whole video conferencing system.
Claims (10)
1. be used for Screen sharing and the control method of video conferencing system, it is characterized in that, may further comprise the steps:
A. video conference terminal and server and Screen sharing equipment establish a communications link;
B. Screen sharing equipment and server are set up the transmission of video passage;
C. video conference terminal receives the Screen sharing control command that the user sends;
D. select and arrange Screen sharing equipment according to the Screen sharing control command, Screen sharing equipment gathers self Screen sharing data, and the Screen sharing data that collect are sent to video conference terminal;
E. video conference terminal copies and is transmitted to server with the Screen sharing data that receive;
F. server sends to Screen sharing equipment with the Screen sharing data;
G. Screen sharing equipment receives and the shared data of display screen.
2. Screen sharing and control method for video conferencing system according to claim 1 is characterized in that step a is further comprising the steps of:
A1. video conference terminal is set up the network service Connection Service, provides port for the Screen sharing equipment connection that needs to share screen, and described Screen sharing equipment is one or more in PC, notebook computer, smart mobile phone and the panel computer;
A2. video conferencing system is by the network connection service device, and verifies in connection procedure, if be proved to be successful, then be connected with the server service of setting up and enter step a3, if authentication failed then disconnects, describedly is connected to wired and/or wireless connections;
A3. video conference terminal creates abstract video data objects, and the video of connection server is transmitted service.
3. Screen sharing and control method for video conferencing system according to claim 1 and 2 is characterized in that step b is further comprising the steps of:
B1. the signal of Screen sharing equipment receiver, video conference terminal judges whether video conference terminal is connected to the video forwarding service of server, if, then enter step b2, if not, then do not deal with;
B2. Screen sharing device initialize local video collector and encoder are set up the transmission of video passage with server.
4. Screen sharing and control method for video conferencing system according to claim 3 is characterized in that step b2 is further comprising the steps of:
B21. judge whether the user specifies shared screen area voluntarily, if, then enter step b22, if not, then be defaulted as full frame sharing and the initialization video collector;
B22. receive and resolve the Screen sharing zone of user's input, and the initialization video collector.
5. Screen sharing and control method for video conferencing system according to claim 3 is characterized in that, described transmission of video passage is the data transmission channel according to TCP or the foundation of UDP host-host protocol.
6. described Screen sharing and control method for video conferencing system of any one according to claim 1～5, it is characterized in that described Screen sharing control command comprises the Screen sharing facility information that provides shared, receive in Screen sharing facility information, Screen sharing device screen resolution, Screen sharing scope, coded format and the transmission of video code check of the information of sharing one or more.
7. Screen sharing and control method for video conferencing system according to claim 6 is characterized in that step c is further comprising the steps of:
C1. the Screen sharing control command that video conference terminal receives and analysis user is sent, parse the address of the Screen sharing equipment that provides shared and the address that the Screen sharing equipment of information is shared in reception, described the address of shared Screen sharing equipment is provided is one or more, and the address that the Screen sharing equipment of information is shared in described reception is one or more;
C2. the video conference terminal address that will receive the Screen sharing equipment of the information of sharing sends to server;
C3. the server address that set up to receive tabulation and will receive the Screen sharing equipment of the information of sharing is stored in to receive and tabulates.
8. Screen sharing and control method for video conferencing system according to claim 6 is characterized in that steps d is further comprising the steps of:
D1. video conference terminal obtains the resolution information that Screen sharing equipment is supported, and compare with resolution that video conference terminal is supported, draw the resolution information group that video conference terminal support and Screen sharing equipment are also supported, the resolution information group is sent to server;
D2. server feeds back to the user with the resolution information group, the user carries out the setting of Screen sharing parameter according to the resolution information group, and described parameter setting comprises one or more in terminal point coordinate, Screen sharing compression coding mode and the Screen sharing code check of origin coordinates that screen resolution, screen pick up, screen scraping;
D3. server sends to video conference terminal with user's parameter setting information, and video conference terminal is transmitted to it shares the display device execution.
9. according to claim 7 or 8 described Screen sharing and control methods for video conferencing system, it is characterized in that step f is further comprising the steps of:
F1. server reads the Screen sharing device address that receives in the tabulation;
F2. video is shared data based Screen sharing device address and send to all Screen sharing equipment.
10. Screen sharing and control method for video conferencing system according to claim 9 is characterized in that step g is further comprising the steps of:
G1. Screen sharing equipment is judged reception and is resolved the Screen sharing data, whether the Screen sharing data of judging current reception have comprised a plurality of Screen sharing device screen data, if judge that the current screen shared device is one, then directly the shared terminal on-screen data is presented on the screen, if judge that the current screen shared device is a plurality of, then enter step g 2;
G2. all Screen sharing device screen data all are presented on the screen, carry out selectivity according to the control command of user's input and show.
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