CN101783919A - Round-robin method based on video conference - Google Patents
Round-robin method based on video conference Download PDFInfo
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- CN101783919A CN101783919A CN200910200276A CN200910200276A CN101783919A CN 101783919 A CN101783919 A CN 101783919A CN 200910200276 A CN200910200276 A CN 200910200276A CN 200910200276 A CN200910200276 A CN 200910200276A CN 101783919 A CN101783919 A CN 101783919A
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Abstract
The invention discloses a round-robin method based on video conference, comprising the following steps of: setting at least one round-robin list, grouping videos of conference members to take part in the round-robin, adding the videos to the corresponding round-robin lists respectively, and ordering the videos according to a preset order; setting each group of the round-robin lists to obtain a round-robin window; enumerating all video windows in a conference template for being selected by users, wherein the number of the selected windows is the number of the round-robin; setting round-robin times of the videos of the conference members; after the round-robin starts, processing video data flows in a switching process; stopping receiving the video data flows of the former video, and stopping the last frame of the video on the video window; starting receiving data of a next video, and starting analyzing the received data; and when one complete video image can be obtained after decoding, carrying out the video switch to switch to the next video. In the invention, the set conference members can be seen in the conference system, and a plurality of conference members can automatically perform the round-robin according to the preset time interval.
Description
Technical field
The invention belongs to the audio frequency and video technical field, relate to a kind of round-robin method, relate in particular to a kind of round-robin method based on video conference.
Background technology
The arriving of information age, the development of The present computer technology, network technology, the communication technology, stream media technology, database technology and artificial intelligence technology etc., for the development of multimedia videoconference system provides strong technical guarantee condition, Streaming Media is meant that on the internet with the mode real-time release sound of data flow, the medium of video multimedia content, stream media technology then is the technology that is used for issuing multimedia data flow on IP network.
The difference of stream media technology and traditional play-back technology is that traditional play-back technology is to download complete file by client from server, plays then; Stream media technology has then adopted the stream transmission mode, the whole multimedia File Compress is resolved to a plurality of compressed packages, to client order transmission in real time, the user need not to wait for that whole file download finishes, decompress(ion) is play the compressed package that sends previously on one side, download follow-up compressed package on one side, thereby saved user's time.It is the realization of the video conferencing system assurance that provides the foundation.And along with video conferencing system is more and more universal, video conferencing system is also more and more huger, participate in the video conference number of users simultaneously also in continuous increase, and the display video position in the video conferencing system is like the seat in the traditional sense meeting, just become scarce resource, and the method for handling such predicament at present generally is the identity conference participation that allows major part not have interactive participant one to audit, just as standing in the participant among the row and passageway behind the convention hall in the traditional sense meeting, seat occupied not, such application model the broadcast announcement type etc. the not strong occasion of interactivity, but in a lot of this methods of occasion is inapplicable, shortcoming be its interactivity a little less than, can not satisfy more and more huger requested session, allow the participant can not experience the overall picture of whole meeting, can only see that limited several roads look audio frequency.In order to overcome this shortcoming, the method that the video repeating query is carried out in the present invention's proposition.
Summary of the invention
Technical problem to be solved by this invention is: a kind of round-robin method based on video conference is provided, can sees the participant of setting in conference system, and a plurality of participant can be according to the automatic repeating query of setting of the time interval.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of round-robin method based on video conference, this method comprises the steps:
A, set at least one repeating query tabulation, the video that will participate in the participant of repeating query divides into groups, and respectively and add in the corresponding repeating query tabulation, sorts according to the order of setting;
B, set every group of repeating query tabulate the repeating query window; Enumerate video windows all in the meeting masterplate, select for the user, select single or multiple windows, selected window number is the repeating query number;
The repeating query time of C, setting participant video;
D, after repeating query begins, video data stream is handled in switching; Stop to receive the video data stream of preceding video, and this video last frame is rested on the video window, and begin to receive the rear video data, and begin to analyze receive data, in the time of after decoding, obtaining a complete video image, carry out video switch again, switch to rear video.
As a preferred embodiment of the present invention, among the step D, if after receiving an I frame of rear video data, can obtain complete image, the B frame and the P frame that then will receive are before this given up to fall, and do not process; Be subjected to the regularity of I frame time of occurrence in network environment and the coding rule, the time that every repeating query video is switched is nonsynchronous; When one tunnel repeating query video when repeating query time finishes, what do not occur also that I frame or other factors cause can not decode complete image, then forces rear video and preceding video to switch.
As a preferred embodiment of the present invention, step D comprises the steps:
D1, repeating query timer according to the repeating query time of setting, send a repeating query every the fixing repeating query time to system and switch message after the beginning repeating query, start video switch;
Come first video note rear video during D2, every group of repeating query are tabulated, will begin to receive its video data from network, whether voice data receives according to the setting during repeating query is determined; If video before existing on the repeating query window, then stop to be received in the preceding video on the repeating query window, and the last frame image of preceding video is retained on the video window, this reservation is and does not exchange video source, stops the receiver, video source data and can be retained on the video window;
D3, judge the rear video data receive, the rear video packet is carrying out judging that the Frame of receiving is the sort of frame type after network bottom layer is reduced to video requency frame data; If receive B frame or P frame, deliver to decoder, decoder can't decode a width of cloth complete image, receives that the I frame then can decode complete image, so will all will be abandoned receiving B frame or the P frame received before the I frame of winning;
D4, after receiving the I frame, promptly think and to decode complete image, then to trigger video switch, promptly switch in go forward video data source and rear video data source of repeating query window, after the switching preceding video data source is destroyed, add the participant of preceding video correspondence to table tail that this group repeating query is tabulated, to reach the circulation repeating query.
As a preferred embodiment of the present invention, in the steps A, by the name of participant in the meeting sort, according to participant's the academic title ordering of sorting or the like, also can freely sort and promptly set up round-robin order on their own by the user.
As a preferred embodiment of the present invention, among the step B, when selecting, carry out collision detection, the repeating query window that a video window can not be tabulated as two repeating queries simultaneously; When a video window is set at the repeating query window, the non-repeating query video of other in the meeting can not take this window again.
As a preferred embodiment of the present invention, among the step C, the repeating query time of setting needs more than or equal to certain minimum time restriction.
Beneficial effect of the present invention is: the round-robin method that the present invention proposes based on video conference, after repeating query begins, video data stream is handled in switching; Stop to receive the video data stream of preceding video, and this video last frame is rested on the video window, and begin to receive the rear video data, and begin to analyze receive data, in the time of after decoding, obtaining a complete video image, carry out video switch again, switch to rear video.Round-robin method of the present invention can be seen the participant of setting in conference system, and a plurality of participant can be according to the automatic repeating query of setting of the time interval.So, can in limited window, see more participant.
Description of drawings
Fig. 1 is the flow chart based on the round-robin method of video conference.
Fig. 2 is the flow chart to the ordering of repeating query user grouping.
The flow chart that Fig. 3 takes over seamlessly for the repeating query video.
Fig. 4 is based on the flow chart of the round-robin method of video conference among the embodiment three.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
Embodiment one
The present invention has disclosed a kind of round-robin method based on video conference, and in large-scale video conferencing system, most user video may be displayed in other participants' the conference system; The participant can see most of participant in conference system.
For the ease of description afterwards, at first term is carried out description below:
Repeating query window: in the meeting masterplate, be appointed as the video window that carries out the video switch repeating query in the above.
The repeating query time: in the repeating query process, carry out interior video every the time of appointment and switch, this time period is the repeating query time.
Repeating query is switched: according to setting rule sorted video sequence is switched demonstration in order on the window's position of setting.
Handoff delay: in the process of video switch, Switch Video demonstrates the time difference of image and change action.
Repeating query number: the number of the video that each repeating query is switched.
Preceding video: be about to the user video that quilt is changed.
Rear video: be about to the user video that quilt is changed.
The I frame, the P frame, the B frame: in the process of video coding, be divided into this three kinds of frames according to its coding rule,
The I frame: the key frame that is otherwise known as, the coding of graphics rule of its jpg of coding method fundamental sum is identical, only has intraframe coding, does not have interframe movement to estimate, need not be with reference to other frame, so the I frame has synchronous effect.
The P frame: forward-predictive-coded frames is otherwise known as.The P frame is to be reference frame with the I frame, finds out the predicted value and the motion vector of P frame " certain point " in the I frame, gets prediction difference and motion vector transmits together.From the I frame, find out the predicted value of P frame " certain point " and obtained P frame " certain point " sample value mutually according to motion vector at receiving terminal with difference.
The B frame: bi-directional predicted interpolation coding frame is otherwise known as.The B frame is a reference frame with the I of front or the P frame of P frame and back, predicted value and two motion vectors of " finding out " B frame " certain point ", and get prediction difference and motion vector transmission.Receiving terminal according to the motion vector predicted value of in two reference frames, " finding out (calculating) " and with the difference summation, obtain B frame " certain point " sample value.
See also Fig. 1, the round-robin method that the present invention is based on video conference comprises the steps:
The video that [steps A] will participate in the participant of repeating query divides into groups and adds in the corresponding repeating query tabulation, sorts according to the order of setting again.
For example, by the name of participant in the meeting sort, according to participant's the academic title ordering of sorting or the like, also can freely sort and promptly set up round-robin order on their own by the user.
[step B] set every group of repeating query tabulate the repeating query window.
At first enumerate video windows all in the meeting masterplate, select for the user, can select singlely also can select a plurality of windows, selected window number is the repeating query number, when selecting, carry out collision detection, the repeating query window that a video window can not be tabulated as two repeating queries simultaneously.When a video window is set at the repeating query window, the non-repeating query video of other in the meeting can not take this window again.
[step C] further sets the repeating query time.
There is a restriction setting repeating query time, be subjected to the influence of network environment and video coding rule, differ and accomplish taking over seamlessly of video surely in a short period of time, then need to wait for a period of time, promptly enable to take over seamlessly also not hommization of impression, influence user experience to the participant.So on the setting repeating query time, will do a minimum time restriction.
[step D] in order to reach taking over seamlessly between two user videos, avoids occurring in the video switch process rough phenomenons such as blank screen or Hua Ping after repeating query begins; At this moment, need when switching, handle video data stream.
As follows in detail: the video data stream of video before stopping to receive, and this video last frame rested on the video window, and begin to receive the rear video data, and begin to analyze receive data, in the time of after decoding, obtaining a complete video image, carry out video switch again, generally speaking, behind an I frame that receives the rear video data, just complete image can have been obtained, the B frame and the P frame that receive before this will be rejected, not process.Be subjected to the regularity of I frame time of occurrence in network environment and the coding rule, so the time that every repeating query video is switched is nonsynchronous.When one tunnel repeating query video when repeating query time finishes, what do not occur still that I frame or other factors cause can not decode complete image, will force rear video and preceding video to switch.
In sum, the round-robin method based on video conference that the present invention proposes after repeating query begins, is handled in switching video data stream; Stop to receive the video data stream of preceding video, and this video last frame is rested on the video window, and begin to receive the rear video data, and begin to analyze receive data, in the time of after decoding, obtaining a complete video image, carry out video switch again, switch to rear video.Round-robin method of the present invention can be seen the participant of setting in conference system, and a plurality of participant can be according to the automatic repeating query of setting of the time interval.So, can in limited window, see more participant.
Embodiment two
Present embodiment is implemented in the video repeating query module in certain video conferencing system with video round-robin method of the present invention, and embodiment further specifies technical scheme of the present invention below in conjunction with accompanying drawing.
At first with reference to figure 2, to the user's that will carry out repeating query grouping and sequencer procedure, comprise several participants that video is arranged and several repeating query groups in its expression meeting.Step is as follows:
Step 1.1, in video conferencing system, the participant who participates in repeating query chosen and add in each repeating query group from participant's tabulation (comprise several repeating query groups), " repeating query group 1 " and " repeating query group 2 " as shown in FIG., the repeating query group is an orderly arrangement, the Cahn-Ingold-Prelog sequence rule of arranging can set up on their own, in video conferencing system, can set and comprise by position, by login time, by the academic title, wait mode to sort by name, can also sort in the mode that freely sorts.The user can sort to the repeating query user voluntarily according to oneself hobby.Here also do some explanation, in video conferencing system, inevitably can be because the situation that going offline appears in a variety of causes, so will handle especially, after the user goes offline, in the repeating query tabulation, preserve this user profile, do not do deletion, when repeating query takes turns to this user, do not do video switch, skip this user and next user and switch.
After step 1.2, repeating query group are set and finished, also to set the repeating query window and the repeating query time of this repeating query group to each repeating query group.The repeating query window and be can not exchanging window to setting window attribute when selecting, and other videos in the conference system can not carry out place-exchange with the video that is made as on the repeating query window, finish back recovery former state up to repeating query.In the conference system, this video window of all participants all is set to the repeating query window in order to keep synchronously.Be exactly to configure the repeating query time then, restriction repeating query time set scope is more than 30 seconds in video conferencing system, to guarantee normally carrying out of repeating query switching.
With reference to figure 3, its committed step repeating query that is illustrated in the video repeating query process is switched.Step is as follows:
Step 2.1, repeating query timer according to the repeating query time of setting, send a repeating query every the fixing repeating query time to system and switch message after the beginning repeating query, start video switch.
Step 2.2 comes first video note rear video in every group of repeating query tabulation, will begin to receive from network its video data, and voice data needs to determine according to being set in to receive or do not receive during the repeating query.Stop to be received in the preceding video (if having preceding video on the repeating query window) on the repeating query window simultaneously, and the last frame image of preceding video is retained on the video window, this reservation is and does not exchange video source, and stopping the receiver, video source data can be retained on the video window.
Step 2.3 is judged the rear video data receive, and the rear video packet is carrying out judging that the Frame of receiving is the sort of frame type after network bottom layer is reduced to video requency frame data.When receiving B frame or P frame, deliver to decoder, decoder can't decode a width of cloth complete image, is subjected to the I frame and then can decodes complete image, so will all will be abandoned receiving B frame or the P frame received before the I frame of winning.
Step 2.4, after receiving the I frame, promptly think and to decode complete image, then to trigger video switch, promptly switch in go forward video data source and rear video data source of repeating query window, after the switching preceding video data source is destroyed, added the participant of preceding video correspondence to table tail that this group repeating query is tabulated, to reach the function of circulation repeating query.
Embodiment three
See also Fig. 4, present embodiment discloses a kind of round-robin method based on video conference, and this method comprises the steps:
Steps A ', set at least one repeating query tabulation, the video that will participate in the participant of repeating query divides into groups, and respectively and add in the corresponding repeating query tabulation, sorts according to the order of setting.
As, by the name of participant in the meeting sort, according to participant's the academic title ordering of sorting or the like, also can freely sort and promptly set up round-robin order on their own by the user.
Step B ', set every group of repeating query tabulate the repeating query window; Enumerate video windows all in the meeting masterplate, select for the user, select single or multiple windows, selected window number is the repeating query number.
When selecting, carry out collision detection, the repeating query window that a video window can not be tabulated as two repeating queries simultaneously; When a video window is set at the repeating query window, the non-repeating query video of other in the meeting can not take this window again.
The repeating query time of step C ', setting participant video.The repeating query time of setting needs more than or equal to certain minimum time restriction.
Step D ', after repeating query begins, video data stream is handled in switching; Stop to receive the video data stream of preceding video, and this video last frame is rested on the video window, and begin to receive the rear video data, and begin to analyze receive data, in the time of after decoding, obtaining a complete video image, carry out video switch again, switch to rear video.
Wherein, if after receiving an I frame of rear video data, can obtain complete image, the B frame and the P frame that then will receive are before this given up to fall, and do not process; Be subjected to the regularity of I frame time of occurrence in network environment and the coding rule, the time that every repeating query video is switched is nonsynchronous; When one tunnel repeating query video when repeating query time finishes, what do not occur also that I frame or other factors cause can not decode complete image, then forces rear video and preceding video to switch.
Step D ' comprises the steps:
D1 ', repeating query timer according to the repeating query time of setting, send a repeating query every the fixing repeating query time to system and switch message after the beginning repeating query, start video switch;
Come first video note rear video during D2 ', every group of repeating query are tabulated, will begin to receive its video data from network, whether voice data receives according to the setting during repeating query is determined; If video before existing on the repeating query window, then stop to be received in the preceding video on the repeating query window, and the last frame image of preceding video is retained on the video window, this reservation is and does not exchange video source, stops the receiver, video source data and can be retained on the video window;
D3 ', judge the rear video data receive, the rear video packet is carrying out judging that the Frame of receiving is the sort of frame type after network bottom layer is reduced to video requency frame data; If receive B frame or P frame, deliver to decoder, decoder can't decode a width of cloth complete image, receives that the I frame then can decode complete image, so will all will be abandoned receiving B frame or the P frame received before the I frame of winning;
D4 ', after receiving the I frame, promptly think and to decode complete image, then to trigger video switch, promptly switch in go forward video data source and rear video data source of repeating query window, after the switching preceding video data source is destroyed, add the participant of preceding video correspondence to table tail that this group repeating query is tabulated, to reach the circulation repeating query.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or substantive characteristics, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to disclosed embodiment.
Claims (7)
1. the round-robin method based on video conference is characterized in that, this method comprises the steps:
A, set at least one repeating query tabulation, the video that will participate in the participant of repeating query divides into groups, and respectively and add in the corresponding repeating query tabulation, sorts according to the order of setting;
B, set every group of repeating query tabulate the repeating query window; Enumerate video windows all in the meeting masterplate, select for the user, select single or multiple windows, selected window number is the repeating query number;
The repeating query time of C, setting participant video;
D, after repeating query begins, video data stream is handled in switching; Stop to receive the video data stream of preceding video, and this video last frame is rested on the video window, and begin to receive the rear video data, and begin to analyze receive data, in the time of after decoding, obtaining a complete video image, carry out video switch again, switch to rear video.
2. the round-robin method based on video conference according to claim 1 is characterized in that:
Among the step D, if after receiving an I frame of rear video data, can obtain complete image, the B frame and the P frame that then will receive are before this given up to fall, and do not process;
Be subjected to the regularity of I frame time of occurrence in network environment and the coding rule, the time that every repeating query video is switched is nonsynchronous;
When one tunnel repeating query video when repeating query time finishes, what do not occur also that I frame or other factors cause can not decode complete image, then forces rear video and preceding video to switch.
3. the round-robin method based on video conference according to claim 1 is characterized in that:
Step D comprises the steps:
D1, repeating query timer according to the repeating query time of setting, send a repeating query every the fixing repeating query time to system and switch message after the beginning repeating query, start video switch;
Come first video note rear video during D2, every group of repeating query are tabulated, will begin to receive its video data from network, whether voice data receives according to the setting during repeating query is determined; If video before existing on the repeating query window, then stop to be received in the preceding video on the repeating query window, and the last frame image of preceding video is retained on the video window, this reservation is and does not exchange video source, stops the receiver, video source data and can be retained on the video window;
D3, judge the rear video data receive, the rear video packet is carrying out judging that the Frame of receiving is the sort of frame type after network bottom layer is reduced to video requency frame data; If receive B frame or P frame, deliver to decoder, decoder can't decode a width of cloth complete image, receives that the I frame then can decode complete image, so will all will be abandoned receiving B frame or the P frame received before the I frame of winning;
D4, after receiving the I frame, promptly think and to decode complete image, then to trigger video switch, promptly switch in go forward video data source and rear video data source of repeating query window, after the switching preceding video data source is destroyed, add the participant of preceding video correspondence to table tail that this group repeating query is tabulated, to reach the circulation repeating query.
4. the round-robin method based on video conference according to claim 1 is characterized in that:
In the steps A, by the name of participant in the meeting sort, according to participant's the academic title ordering of sorting or the like, also can freely sort and promptly set up round-robin order on their own by the user.
5. the round-robin method based on video conference according to claim 1 is characterized in that:
Among the step B, when selecting, carry out collision detection, the repeating query window that a video window can not be tabulated as two repeating queries simultaneously;
When a video window is set at the repeating query window, the non-repeating query video of other in the meeting can not take this window again.
6. the round-robin method based on video conference according to claim 1 is characterized in that:
Among the step C, the repeating query time of setting needs more than or equal to certain minimum time restriction.
7. the round-robin method based on video conference is characterized in that, this method comprises the steps:
A, set at least one repeating query tabulation, the video that will participate in the participant of repeating query divides into groups, and respectively and add in the corresponding repeating query tabulation, sorts according to the order of setting;
B, set every group of repeating query tabulate the repeating query window; Enumerate video windows all in the meeting masterplate, select for the user, select single or multiple windows, selected window number is the repeating query number;
The repeating query time of C, setting participant video;
D, after repeating query begins, video data stream is handled in switching; Stop to receive the video data stream of preceding video, and this video last frame is rested on the video window, and begin to receive the rear video data, and begin to analyze receive data, in the time of after decoding, obtaining a complete video image, carry out video switch again, switch to rear video;
Among the step D, if after receiving an I frame of rear video data, can obtain complete image, the B frame and the P frame that then will receive are before this given up to fall, and do not process;
Be subjected to the regularity of I frame time of occurrence in network environment and the coding rule, the time that every repeating query video is switched is nonsynchronous;
When one tunnel repeating query video when repeating query time finishes, what do not occur also that I frame or other factors cause can not decode complete image, then forces rear video and preceding video to switch;
Step D comprises the steps:
D1, repeating query timer according to the repeating query time of setting, send a repeating query every the fixing repeating query time to system and switch message after the beginning repeating query, start video switch;
Come first video note rear video during D2, every group of repeating query are tabulated, will begin to receive its video data from network, whether voice data receives according to the setting during repeating query is determined; If video before existing on the repeating query window, then stop to be received in the preceding video on the repeating query window, and the last frame image of preceding video is retained on the video window, this reservation is and does not exchange video source, stops the receiver, video source data and can be retained on the video window;
D3, judge the rear video data receive, the rear video packet is carrying out judging that the Frame of receiving is the sort of frame type after network bottom layer is reduced to video requency frame data; If receive B frame or P frame, deliver to decoder, decoder can't decode a width of cloth complete image, receives that the I frame then can decode complete image, so will all will be abandoned receiving B frame or the P frame received before the I frame of winning;
D4, after receiving the I frame, promptly think and to decode complete image, then to trigger video switch, promptly switch in go forward video data source and rear video data source of repeating query window, after the switching preceding video data source is destroyed, add the participant of preceding video correspondence to table tail that this group repeating query is tabulated, to reach the circulation repeating query.
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| CN105704446A (en) * | 2016-01-19 | 2016-06-22 | 浙江大华技术股份有限公司 | Method and device for switching videos in multiple windows |
| CN105704446B (en) * | 2016-01-19 | 2018-12-07 | 浙江大华技术股份有限公司 | A kind of method and device of multiwindow video switching |
| CN107277430A (en) * | 2017-07-27 | 2017-10-20 | 福建星网智慧科技股份有限公司 | A kind of video flowing carousel method of video conferencing system |
| CN110324723A (en) * | 2018-03-29 | 2019-10-11 | 华为技术有限公司 | Method for generating captions and terminal |
| CN110324723B (en) * | 2018-03-29 | 2022-03-08 | 华为技术有限公司 | Subtitle generating method and terminal |
| WO2019184650A1 (en) * | 2018-03-29 | 2019-10-03 | 华为技术有限公司 | Subtitle generation method and terminal |
| CN109963107A (en) * | 2019-02-20 | 2019-07-02 | 视联动力信息技术股份有限公司 | A kind of display methods and system of audio, video data |
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| CN110062194B (en) * | 2019-04-19 | 2022-01-11 | 视联动力信息技术股份有限公司 | Audio and video data processing method, device and storage medium |
| CN110062194A (en) * | 2019-04-19 | 2019-07-26 | 视联动力信息技术股份有限公司 | A kind of processing method of audio, video data, device and device and storage medium |
| CN110933359A (en) * | 2020-01-02 | 2020-03-27 | 随锐科技集团股份有限公司 | Intelligent video conference layout method and device and computer readable storage medium |
| CN110933359B (en) * | 2020-01-02 | 2021-07-02 | 随锐科技集团股份有限公司 | Intelligent video conference layout method and device and computer readable storage medium |
| CN113891032A (en) * | 2021-03-17 | 2022-01-04 | 广州市保伦电子有限公司 | Method and server for automatically switching layout of video conference terminal of mobile terminal |
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