CN101977324A - Method for realizing screen sharing - Google Patents
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- CN101977324A CN101977324A CN2010105494599A CN201010549459A CN101977324A CN 101977324 A CN101977324 A CN 101977324A CN 2010105494599 A CN2010105494599 A CN 2010105494599A CN 201010549459 A CN201010549459 A CN 201010549459A CN 101977324 A CN101977324 A CN 101977324A
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Abstract
The invention discloses a method for realizing screen sharing, which comprises the following steps that: wired or wireless network connection between server equipment and a plurality of pieces of client equipment is established respectively; the server equipment captures a screen to be shared, and performs video coding on the captured screen to be shared according to a set video coding mode to obtain video coding data; the server equipment transmits the video coding data to the client equipment in a broadcasting way; and the client equipment decodes the received video coding data and outputs the video coding data to own screens for display. In the method for realizing the sharing of the screen of the server equipment on the client equipment, a transmission distance between the server equipment and the client equipment is longer, and the space application range of the screen sharing is expanded; and simultaneously, the server equipment transmits the video data to be shared in the broadcasting way so as to realize the function of displaying the screen of the server equipment on the plurality of pieces of client equipment.
Description
Technical field
The present invention relates to the embedded system applied technical field, specifically, relate to a kind of method that realizes Screen sharing.
Background technology
The Screen sharing technology mainly is in order to realize that wanting content displayed to project to small screen device shows on the large-screen so that the purpose of watching.Screen sharing solution commonly used at present is to utilize the VGA connecting line to connect will share the equipment of screen and the screen equipment that is used to share, and the image resource that realization will be shared the equipment of screen shows on the screen of the screen equipment that is used to share.There is following shortcoming and defect in this Screen sharing solution commonly used: two equipment that 1, require to connect must be supported the connecting line standard interface, have VGA interface or other and can support the interface shared, thereby limited sharable equipment and connected mode thereof; 2,,, thereby limited distance between two equipment that are connected because of the connecting line limited length owing to need the VGA connecting line to carry out line to connect; 3, be subjected to the influence of VGA technology itself, there is loss in the image quality that shares on the screen, influences the screen display definition; 4, sharing of image resource can only be realized, audio frequency can not be shared.
In view of the above-mentioned shortcoming and defect that Screen sharing solution commonly used exists, the applicant had once proposed a kind of implementation method of that server equipment shares screen of client equipment.This method will be shared the equipment of screen, as server apparatus, and will have the equipment of shared screen as PC, mobile phone etc., as television set, as client device, between server apparatus and client device, set up wired or wireless network connects, the data that will share by Network Transmission.Transmission is during shared data, according to default video output formats the screen of the server apparatus that grasps carried out video coding again earlier at the server apparatus end, to guarantee to share the fluency and the definition of the picture of exporting behind the screen.In addition, this method by network except the video image that can transmission server equipment will share, the voice data of server apparatus can also be carried out audio decoder as required, and transfer to client device with video data encoder, be implemented in the audio frequency of share service device equipment on the client device, satisfy the different demands of user sharing.
Though the above-mentioned screen sharing method that the applicant proposes makes the transmission range between server apparatus and the client device become big, has expanded the space scope of application of Screen sharing; And server apparatus can be encoded to audio frequency as required, and be transmitted through the network to client device output together with video, realized sharing synchronously of audio frequency, video, the content that has satisfied to greatest extent small screen device shares to the demand that large-screen equipment is watched.But also have several problems not consider in this method: first, a server apparatus in this method is only at a client device, do not consider problem that the screen of a server apparatus shows on a plurality of client devices simultaneously and the method that addresses this problem; The second, may there be audio frequency in the server apparatus video film source at different, video is asynchronous or captions and the nonsynchronous phenomenon of sound, and this method does not relate to this way to solve the problem; The 3rd, though server apparatus can carry out video coding again to the screen that grasps according to default video output formats, do not provide how the user selects default video output formats according to different scenes foundation or standard, technical scheme is optimized inadequately.
At the screen sharing method above shortcomings that propose before the applicant, the applicant does further to improve to technical scheme, and then proposes the optimal solution that the present invention realizes Screen sharing.
Summary of the invention
The object of the present invention is to provide a kind of method that realizes Screen sharing, to solve the above-mentioned shortcoming and defect that existing screen sharing method exists.
For achieving the above object, the present invention adopts following technical proposals to be achieved:
A kind of method that realizes Screen sharing comprises the steps:
Server apparatus sets up wired respectively with a plurality of client devices or wireless network is connected;
Server apparatus grasps the pre-screen of sharing, and according to the video coding mode of setting the pre-screen of sharing that grasps is carried out video coding, obtains video data encoder;
Server apparatus transfers to client device with broadcast mode with video data encoder;
The video data encoder that client device decoding receives and exporting on its screen shows.
The method of aforesaid realization Screen sharing, for the continuous transmission that guarantees video flowing, be convenient to support the client device that added afterwards simultaneously, interface channel between server apparatus and client device comprises data channel and command channel, header information data in the described video data encoder transfer to client device by the command channel, and other information datas transfer to client device by data channel with broadcast mode.
The method of aforesaid realization Screen sharing, after adopting command channel and two interface channels of data channel, for realizing being correctly decoded of client device, other information datas in header information data in the video data encoder that client device will receive by described command channel and the video data encoder that receives with broadcast mode by described data channel be combined, and separate the video data encoder behind the code combination then and export on its screen to show.
The method of aforesaid realization Screen sharing, all keep higher definition and fluency when dynamic environment and the static text for realizing sharing scene, when the video coding mode of described setting was dynamic coding, server apparatus adopted encryption algorithm H.264 that the pre-screen of sharing that grasps is carried out video coding; When the video coding mode of described setting was static coding, server apparatus adopted the MJPEG encryption algorithm that the pre-screen of sharing that grasps is carried out video coding.
The method of aforesaid realization Screen sharing, can also realize that between server apparatus and client device audio frequency is shared, be specially: coded audio data is encoded, obtained to server apparatus according to default audio coding mode to the audio frequency of server apparatus, server apparatus transfers to client device with broadcast mode simultaneously with coded audio data after compound and video data encoder, carries out voice playing and video demonstration behind coded audio data that the client device decoding receives and the video data encoder.
The method of aforesaid realization Screen sharing, for time difference of realizing dynamically adjusting Voice ﹠ Video, the sound that guarantees to share, video synchronously, server apparatus encode audio data and video data encoder carry out compound before, the time migration of adjusting audio or video earlier realize Voice ﹠ Video synchronously.
The method of aforesaid realization Screen sharing, for the continuous transmission that guarantees audio stream, be convenient to support the client device that added afterwards simultaneously, interface channel between server apparatus and client device comprises data channel and command channel, header information data in the described coded audio data transfer to client device by the command channel, and other information datas transfer to client device by data channel with broadcast mode; Other information datas in header information data in the coded audio data that client device will receive by described command channel and the coded audio data that receives with broadcast mode by described data channel be combined, and carry out voice playing after separating the coded audio data behind the code combination then.
The method of aforesaid realization Screen sharing is the processing speed of accelerating client device, the smoothness that guarantees picture and sound, after client device receives the data of server apparatus transmission, and first buffer memory, and then decoding.
The method of aforesaid realization Screen sharing, but server apparatus and client device are found the protocol discovery networked devices by automatic, and then set up wired or the wireless network connection.
The method of aforesaid realization Screen sharing, described a plurality of client devices all preferably have the television set of large display screen.
Compared with prior art, advantage of the present invention and good effect are:
1, the present invention realizes screen the sharing on client device of server apparatus by wired or wireless network connection service device equipment and client device, make the transmission range between server apparatus and the client device become big, expanded the space scope of application of Screen sharing; Simultaneously, server apparatus is with the pre-video data of sharing of broadcast mode transmission, realized the function that the screen of a server apparatus shows on a plurality of client devices simultaneously.
2, the present invention is when realizing the Screen sharing of server apparatus, dynamic environment is adopted different encryption algorithms respectively with static text, the user can carry out the selection of algorithms of different according to the difference of using scene, thereby can guarantee that the Screen sharing under the different scenes all has higher fluency and definition, is beneficial to and watches.
3, the present invention adopt on server apparatus, be mode that coding side is dynamically adjusted time migration realize sound, video synchronously, solved different video film source sound, video is asynchronous or captions and the nonsynchronous problem of sound, avoided the different client devices regulative mode inconsistent, adjust complicated problems, the client device that does not perhaps possess regulatory function can't be realized the problem of sound, audio video synchronization.
After reading the specific embodiment of the present invention in conjunction with the accompanying drawings, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the basic flow sheet that the present invention realizes an embodiment of method of Screen sharing;
Fig. 2 is the structural representation that the present invention realizes another embodiment of method of Screen sharing;
Fig. 3 realizes the workflow diagram that scene is switched among Fig. 2 embodiment;
Fig. 4 is a workflow diagram of realizing among Fig. 2 embodiment that audio frequency, audio video synchronization are adjusted.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail.
At first, the basic thought of brief description technical solution of the present invention: do not consider the problem that on a plurality of client devices, shows simultaneously at on-screen data how to realize a server apparatus under the demo environment in the implementation method at a kind of that server equipment shares screen of client equipment that proposes before the applicant, the present invention has adopted data that server apparatus will share with the broadcast mode technical scheme of transmission, thereby has solved the problems referred to above.
Figure 1 shows that the present invention realizes the basic flow sheet of an embodiment of method of Screen sharing.As shown in Figure 1, the basic procedure of this embodiment is:
S101: server apparatus is set up network respectively with a plurality of client devices and is connected.It can be wired connection that this network connects, and also can be wireless connections.
S102: pre-shared data of server apparatus collection and coding.
The data of server apparatus collection may be video datas, also may be the video datas with voice data.For video data, server apparatus grasps the pre-screen of sharing, and according to the method for video coding of setting the pre-screen of sharing that grasps is carried out video coding, obtains video data encoder.For voice data, then directly original audio data is encoded according to the audio coding mode of setting, obtain coded audio data.
S103: server apparatus transmits the coded data that above-mentioned steps S102 obtains with broadcast mode.Broadcasting can be adopted the mode based on udp protocol.
S104: the coded data of client device reception server device broadcasts transmission, and according to the corresponding decoding process decoded data of coded system, output shows or plays on client device then.
Fig. 2 to Fig. 4 shows another embodiment that the present invention realizes the method for Screen sharing.Wherein, Fig. 2 is the structural representation of this embodiment, and Fig. 3 realizes among this embodiment that the workflow diagram that scene is switched, Fig. 4 are the workflow diagrams of realizing among this embodiment that audio frequency, audio video synchronization are adjusted.
In this embodiment, server apparatus is PC, and client device is many television sets that have than large display screen, and Fig. 2 is to be example with television set wherein.Server apparatus PC not only will share its video, also shares audio frequency simultaneously.
In this embodiment, for the continuous transmission that guarantees video flowing, be convenient to support the client device that added afterwards simultaneously, set up two interface channels between PC and television set, one is data channel, and one is the command channel.
As shown in Figure 2, PC end and TV set terminal are respectively according to the Screen sharing between following flow process realization PC and television set:
The course of work of PC end is:
S210: start PC.
S211:PC image data and coding.
The data of gathering comprise video data and the corresponding audio data of sharing screen.For video data, grasp the pre-screen of sharing, the video coding mode of setting according to the user is carried out video coding to the screen that grasps then, obtains video data encoder.For voice data, then directly original audio data is encoded according to the audio coding mode of setting, obtain coded audio data.Corresponding relation between video coding mode and video coding algorithm and shared scene can be with reference to figure 3.The synchronous adjustment of sound, video can be with reference to figure 4.Extract header information data storage and transmission separately then from sound, video data encoder, other remaining information datas are transmitted separately.
S212:PC sends the mode of other information datas except that the header information data in sound, the video data encoder with LAN broadcast by data channel.
S213: the header information data in sound, the video data encoder are placed in the data buffer zone cushion.
S214: be to save Internet resources, PC and television set are only just set up network and are connected when the needs shared data.Specifically can adopt IGRS protocol etc. to find that automatically agreement need to find the equipment of networking automatically, and when finding networked devices is arranged, just between equipment, set up network and connect.
S215: after PC and television set were found mutually and connected, PC sent the header information data in the coded data of buffer stores by the command channel.The information such as coded system, resolution, packaged type, code check that includes coded data in the header information data.
S216: the command channel is except that the transmission header information, and PC is connected network control data such as control, connection status with network between television set also to be undertaken by this command channel alternately.
The course of work of TV set terminal is as follows:
Television set is as client device, at first finds mutually by S224 and server apparatus PC and connects, and carries out S225 then, receives the header information data by the command channel, and the header information of reception carries out buffer-stored by S223.Simultaneously, carry out S220, receive network flow media data by data channel.For the unchanged stream medium data of header information data, the header information data receive only once and get final product.After adopting command channel and two interface channels of data channel, for realizing being correctly decoded, other information datas in header information data in the coded data that television set will receive by the command channel and the coded data that receives with broadcast mode by data channel are combined, carry out the coded data after S221 separates code combination then, at last with decoded sound, video data by carrying out S222 output, show respectively and play.In whole Screen sharing process, television set carries out the mutual of network control data by carrying out S226 with PC.
In the process of PC Screen sharing, can there be static text and dynamic scene, and can switch by frequent between.If all adopt with a kind of coded system, for example adopt the dynamic coding mode, then can influence the display resolution and the fluency of static text.At this moment, allow the user to select different coded systems at different scenes, and different coded systems is provided with different encryption algorithms at the PC end.Specifically, its implementation procedure is as shown in Figure 3:
The S310:PC end is carried out data acquisition.The data acquisition of this moment mainly is to gather video data, also promptly grasps the pre-screen of sharing.
S311: the user is according to sharing the coded system that scene selects change to set.
S312: judge whether the coded system that the user sets is dynamic coding.If, execution in step S314; If not, execution in step S313.
S313: if the coded system that the user sets is not a dynamic coding, then be static coding, at this moment, the PC end adopts the MJPEG encryption algorithm that the screen video data of gathering are carried out video coding, obtains video data encoder.Go to step S315 then.
S314: if the coded system that the user sets is a dynamic coding, adopt then H.264 that encryption algorithm carries out video coding to the screen video data of gathering, obtain video data encoder.Execution in step S315 then.
S315: outputting encoded data, and transfer to television set.
For different video film sources, exist sound, video asynchronous sometimes, perhaps the nonsynchronous phenomenon of captions and sound.Player commonly used now can be realized the synchronous of sound, video by the time migration of adjusting player when addressing this problem.For a plurality of client devices simultaneously during the video film source of share service device ends, the adjustment mode difference of different client devices, and client device such as television set itself do not possess this adjustment function, therefore, can not adopt the scheme of adjusting on client device.The nonsynchronous problem of sound, video that exists when sharing for the settlement server device screen, this embodiment adopts at coding side, be mode that the PC end is adjusted time migration realize sound, video synchronously, detailed process as shown in Figure 4:
S410: carry out audio data collecting.
S411: carry out video data acquiring.
S412: selected fiducial time.
S413: on selected fiducial time, video data is carried out video coding.
S414: according to the time offset between fiducial time and user's adjustment calculating audio frequency and video.
S415: voice data is encoded according to above-mentioned audio frequency and video side-play amount.
S416: video data encoder and coded audio data synchronously is compound, the sick output of the audio/video flow of synthetic standards.
To the adjusting synchronously of sound, video, adjustment process is simple at coding side in employing, and the user can dynamically adjust the time difference between the two, guarantees both synchronous at any time, and needn't consider the structure of the follow-up client device that will share, and versatility is stronger.
In the embodiment of Fig. 1 embodiment and Fig. 2 to Fig. 4, be to accelerate client device processing speed, guarantee the smoothness of picture and sound, client device after the data that receive the server apparatus transmission, all first buffer memory, and then decoding and displaying and broadcast.
Above embodiment is only in order to illustrating technical scheme of the present invention, but not limits it; Although the present invention is had been described in detail with reference to previous embodiment, for the person of ordinary skill of the art, still can make amendment to the technical scheme that previous embodiment is put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of the present invention's technical scheme required for protection.
Claims (10)
1. a method that realizes Screen sharing is characterized in that, comprises the steps:
Server apparatus sets up wired respectively with a plurality of client devices or wireless network is connected;
Server apparatus grasps the pre-screen of sharing, and according to the video coding mode of setting the pre-screen of sharing that grasps is carried out video coding, obtains video data encoder;
Server apparatus transfers to client device with broadcast mode with video data encoder;
The video data encoder that client device decoding receives and exporting on its screen shows.
2. the method for realization Screen sharing according to claim 1, it is characterized in that, interface channel between server apparatus and client device comprises data channel and command channel, header information data in the described video data encoder transfer to client device by the command channel, and other information datas transfer to client device by data channel with broadcast mode.
3. the method for realization Screen sharing according to claim 2, it is characterized in that, other information datas in header information data in the video data encoder that client device will receive by described command channel and the video data encoder that receives with broadcast mode by described data channel be combined, and separate the video data encoder behind the code combination then and export on its screen to show.
4. the method for realization Screen sharing according to claim 1 is characterized in that, when the video coding mode of described setting was dynamic coding, server apparatus adopted encryption algorithm H.264 that the pre-screen of sharing that grasps is carried out video coding; When the video coding mode of described setting was static coding, server apparatus adopted the MJPEG encryption algorithm that the pre-screen of sharing that grasps is carried out video coding.
5. according to the method for each described realization Screen sharing in the claim 1 to 4, it is characterized in that, described method comprises that also server apparatus encodes, obtains the step of coded audio data to the audio frequency of server apparatus according to default audio coding mode, server apparatus transfers to client device with broadcast mode simultaneously with coded audio data after compound and video data encoder, carries out voice playing and video demonstration behind coded audio data that the client device decoding receives and the video data encoder.
6. the method for realization Screen sharing according to claim 5 is characterized in that, server apparatus encode audio data and video data encoder carry out compound before, the time migration of adjusting audio or video earlier realize Voice ﹠ Video synchronously.
7. the method for realization Screen sharing according to claim 5, it is characterized in that, interface channel between server apparatus and client device comprises data channel and command channel, header information data in the described coded audio data transfer to client device by the command channel, and other information datas transfer to client device by data channel with broadcast mode; Other information datas in header information data in the coded audio data that client device will receive by described command channel and the coded audio data that receives with broadcast mode by described data channel be combined, and carry out voice playing after separating the coded audio data behind the code combination then.
8. the method for realization Screen sharing according to claim 1 is characterized in that, after client device receives the data of server apparatus transmission, and first buffer memory, and then decoding.
9. the method for realization Screen sharing according to claim 1 is characterized in that, but server apparatus and client device are found the protocol discovery networked devices by automatic, and then sets up wired or the wireless network connection.
10. the method for realization Screen sharing according to claim 1 is characterized in that, described a plurality of client devices are television set.
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