CN101984661B - Information transmission method of video conference system and video conference system - Google Patents
Information transmission method of video conference system and video conference system Download PDFInfo
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- CN101984661B CN101984661B CN 201010555862 CN201010555862A CN101984661B CN 101984661 B CN101984661 B CN 101984661B CN 201010555862 CN201010555862 CN 201010555862 CN 201010555862 A CN201010555862 A CN 201010555862A CN 101984661 B CN101984661 B CN 101984661B
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Abstract
The invention relates to an information transmission method of a video conference system and the video conference system. The method comprises the following steps: receiving video data sent by terminals; respectively copying the video data to child windows in a current video template corresponding to the terminals according to video channel numbers of the terminals; and coding the video data of the whole current video template and transmitting the coded video data to the terminals. According to the technical proposal of the invention, after the video data sent by the terminals are received, the video data of the terminals are copied to the small windows in the current video template corresponding to the terminals; then the video data of the whole video template are coded and the coded video data are transmitted to the terminals, so that the coded video data received by the terminals contain all video data sent by the terminals and as the video data of all terminals are displayed on a single video template, network bandwidth can be effectively and fully utilized and the check of a multichannel far-end video can be performed on a single terminal.
Description
Technical field
The present invention relates to a kind of information transferring method and video conferencing system of video conferencing system.
Background technology
Along with video coding and development of internet technology; The application of Internet video also more and more widely; Wherein a kind of application mode of Internet video is a video conferencing system, and in use, the video data that each user terminal is gathered this locality is sent to server; Be transmitted to all terminals or the other-end of appointment in the video conferencing system after server receives again, these terminals show after receiving again.Because the powerful expressive ability to virtual reality that HD video provided, HD video becomes the main flow of current video conferencing system gradually, and its video resolution is mostly supported 720P/1080P; Yet, when HD video provides the high expressive force to virtual reality, also higher to the requirement of the network bandwidth; Adopt the communication mode of existing video conferencing system; With the general bandwidth situation of present domestic public network, suppose that all there is upstream bandwidth and the downlink bandwidth of 2Mb/s at each terminal, so; Utilize the H264 coded system to realize the transmission of the 30fps coding of 720P; Each terminal just can only watch a great distance to look closely frequently, if watch very difficulty of the above video of two-way, can't on a terminal, realize checking multichannel far-end video.
Summary of the invention
To the problem that exists in the above-mentioned prior art, the object of the present invention is to provide a kind of information transferring method and a kind of video conferencing system of video conferencing system, it can be implemented in and realizes checking multichannel far-end video on the terminal.
For achieving the above object, the present invention adopts following technical scheme:
A kind of information transferring method of video conferencing system comprises step:
Receive the video data that send at each terminal;
Whether the video size of corresponding subwindow adapts in the resolution of judging video data and the said current video template; If not; The resolution notice of change is sent at terminal to correspondence, and this terminal is according to the resolution of the video data of said resolution notice of change change output;
Number each said video data is copied to subwindow corresponding with each terminal in the current video template respectively according to the video channel at each terminal;
To the coding video data of whole said current video template, and send encoded video data to each said terminal.
A kind of video conferencing system comprises server end and plural terminal, wherein:
Said server end; Be used to receive the video data that send at each terminal; Number each said video data is copied to subwindow corresponding with each terminal in the current video template respectively according to the video channel at each terminal; To the coding video data of whole said current video template, and send encoded video data to each terminal;
Said server end specifically comprises:
The server data Transmit-Receive Unit; Be used to receive the video data that send at each terminal; And send the encoded video data of composite coding unit to each terminal, also be used in the result of determination of said adaptability judging unit sending the resolution notice of change to the terminal of correspondence for not the time;
The adaptability identifying unit is used for judging that the video size of the subwindow that the resolution of video data is whether corresponding with said current video template adapts;
Modular unit is used to store and set the current video template of current use;
The composite coding unit is used for number each said video data being copied to the said current video template subwindow corresponding with each terminal respectively according to the video channel at each terminal, to the coding video data of whole said current video template;
Said terminal; Video data local when being used for video conference sends to said server end; Receive the encoded video data that said server end sends; And, also be used for resolution according to the video data of said resolution notice of change change output to showing said terminal after this encoded video data decoding.
According to the invention described above scheme, it is through setting a video template, having a plurality of wickets in this video template; Each wicket is corresponding with each terminal respectively; After receiving the video data that the terminal sends over, with the video data at this terminal copy to deserve before the wicket corresponding in the video template with this terminal, thereby in this video template, can show the video data that each terminal sends over; Coding video data to the whole video template; And send encoded video data to each terminal, thus the encoded video data that each terminal receives is to have comprised the video data that send at all terminals, and owing to be on a video template, to realize representing each terminal video data; Can fully effectively utilize the network bandwidth, be implemented in and realize checking on the terminal multichannel far-end video.
Description of drawings
Fig. 1 is the schematic flow sheet of the information transferring method embodiment of network video system of the present invention;
Fig. 2 is the exemplary plot of wherein a kind of set-up mode of video template;
Fig. 3 is the exemplary plot of other a kind of set-up mode of video template;
Fig. 4 is the structural representation of network video system embodiment of the present invention.
Embodiment
Below with the mode of specific embodiment the present invention program is set forth in detail.
As shown in Figure 1, be the schematic flow sheet of the information transferring method embodiment of network video system of the present invention, it comprises step:
Step S101: receive the video data that send at each terminal, get into step S102;
Step S 102: number each said video data is copied to subwindow corresponding with each terminal in the current video template respectively according to the video channel at each terminal, get into step S103;
Step S 103: to the coding video data of whole said current video template, and send encoded video data to each said terminal, the coding here can be various types of coded systems, for example adopts the SVC coding to satisfy the demand of high definition as far as possible.
According to the inventive method, it is through setting the video template, having a plurality of wickets in this video template; Each wicket is corresponding with each terminal respectively, after receiving the video data that the terminal sends over, the video data at this terminal is copied to wicket corresponding with this terminal in the current video template; Thereby in the current video template, can show the video data that each terminal sends over; To the coding video data of whole video template, and send encoded video data to each terminal, thereby; The encoded video data that each terminal receives is to have comprised the video data that send at all terminals; And, be implemented in and realize checking on the terminal multichannel far-end video owing to be on a video template, to realize fully effectively to utilize the network bandwidth to the representing of each terminal video data.
In a concrete implementation procedure, can be to have preestablished a video template, the set-up mode of video template can be according to needing setting arbitrarily; It is as shown in Figure 2 that video template wherein a kind of is provided with example, and it is as shown in Figure 3 that video template other a kind of is provided with example, certainly; As required; Also can carry out other setting, the size of each wicket in the video template can be identical also can be inequality, do not repeat them here.
When video conferencing system is launched; This video template that directly will preset is as working as front template; The video data that sends over of receiving terminal then; And this video data copied in the video template with the corresponding wicket in this terminal get final product, and then to the coding video data of whole video template, thereby can obtain comprising the encoded video data of the video data at all terminals; This encoded video data is sent to each terminal, thereby can on each terminal, realize checking a plurality of terminal datas.The information transferring method of this video conferencing system; Owing to adopted the video template to synthesize the data that each terminal sends over; Effectively reduce code check, especially during the HD video more than transmitting two paths, adopt the synthetic mode of this template can effectively reduce the descending pressure at terminal.
Yet, in actual use, because each terminal possibly adopt the coded system of oneself to encode respectively; The resolution of the video data that it sends over maybe be corresponding with it the video size of subwindow do not conform to, cause this video data is being duplicated the past tense display abnormality, can not show or can not normal viewing; To this; In the present invention program, between above-mentioned steps S101 and step S102, also comprise step:
Step S1011: whether the video size of corresponding subwindow adapts in the resolution of judging video data and the said current video template, if not, gets into step S1022, if then get into above-mentioned steps S102;
Step S1012: the resolution notice of change is sent at the terminal to correspondence; This terminal is according to the resolution of the video data of said resolution notice of change change output; And then returning step S101, the video data that the continuation receiving terminal sends over is perhaps judged the video data that next terminal sends over.
In addition; Because being the video size of the subwindow corresponding with it, the resolution of the video data that send at each terminal adapts; The video data that it need not as existing mode, to send highest resolution has effectively reduced the data volume of sending data, has effectively utilized upstream bandwidth; Under the situation that guarantees picture quality, effectively reduced the pressure of upstream bandwidth.
The present invention program in use can also make amendment to above-mentioned video template, that is, the present invention program can also comprise step:
The change template instruction that receiving terminal sends is set at said current video template with the corresponding video template of template ID in the said change template instruction; And the width of the subwindow that changes of the video size in the current video template after will changing, highly sending to corresponding terminal, this terminal is according to the width that receives, highly change the resolution of the video data of coding output.
In the case; Can be provided with a plurality of video templates in advance; Each video template has the template ID of a correspondence respectively, when video conferencing system comes into operation, can pass through the template ID confession user selection at the terminal with each video template of menu or other forms at each terminal; The user can send this change template instruction through the mode that menu is selected, and concrete implementation does not repeat them here.
In addition, because the difference of concrete network environment, network condition possibly can change at any time; For example the network appearance is congested, causes packet loss to raise or the like, in the case; Thereby the time-delay that may cause data to transmit if still send each terminal to the encoded video data of identical frame per second, will certainly cause the lengthening of delay time; Influence the real-time effect of video conference, therefore, when above-mentioned coding video data to whole said current video template; Generate the encoded video data of multiple frame per second; And the packet loss of receiving terminal feedback, confirm frame per second according to the current packet loss in terminal, and will send to this terminal with these frame per second corresponding codes rear video data to the encoded video data of this terminal transmission.That is to say for each terminal, because its packet loss possibly be not quite similar, to the frame per second of the encoded video data of its transmission also difference to some extent.
In a concrete example; Can these frame per second be set to 2fps, 5fps, 10fps, 15fps, 20fps, 25fps, 30fps; Promptly when the figure of whole video template is encoded; Can generate the encoded video data of frame per second such as 2fps, 5fps, 10fps, 15fps, 20fps, 25fps, 30fps, correspondingly, the selected mode of frame per second can be set at following mode:
At packet loss is 0 o'clock, and selected frame per second is the encoded video data of 30fps;
Greater than 0 and smaller or equal to 5% o'clock, selecting frame per second is the encoded video data of 25fps at packet loss;
Greater than 5% and smaller or equal to 10% o'clock, selecting frame per second is the encoded video data of 20fps at packet loss;
Greater than 10% and smaller or equal to 15% o'clock, selecting frame per second is the encoded video data of 15fps at packet loss;
Greater than 15% and smaller or equal to 20% o'clock, selecting frame per second is the encoded video data of 10fps at packet loss;
Greater than 20% and smaller or equal to 25% o'clock, selecting frame per second is the encoded video data of 5fps at packet loss;
Greater than 25% o'clock, selecting frame per second was the encoded video data of 2fps at packet loss.
According to the information transferring method of the video conferencing system of the invention described above, the present invention also provides a kind of video conferencing system, and it comprises server end and plural terminal, wherein:
Said server end; Be used to receive the video data that send at each terminal; Number each said video data is copied to subwindow corresponding with each terminal in the current video template respectively according to the video channel at each terminal; To the coding video data of whole said current video template, and send encoded video data to each terminal;
Said terminal, video data local when being used for video conference sends to said server end, receives the encoded video data that said server end sends, and to showing after this encoded video data decoding.
The structural representation of a concrete example of video conferencing system of the present invention has been shown among Fig. 4, in this structural representation, has only shown one of them terminal, need to prove, this example description is not in order to limit the number at terminal.
As shown in Figure 4, this server end 201 specifically comprises:
Server data Transmit-Receive Unit 2011 is used to receive the video data that send at each terminal 202, and sends the encoded video data of composite coding unit to each terminal 202;
In a concrete implementation procedure, modular unit 2012 can preestablish a video template, and the set-up mode of video template can be according to needing setting arbitrarily; It is as shown in Figure 2 that video template wherein a kind of is provided with example, and it is as shown in Figure 3 that video template other a kind of is provided with example, certainly; As required; Also can carry out other setting, the size of each wicket in the video template can be identical also can be inequality, do not repeat them here.
When video conferencing system is launched; This video template that the modular unit 2012 of server end 201 directly will be preset is as working as front template; The video data that sends over through server data Transmit-Receive Unit 2011 receiving terminals 202 then; Composite coding unit 2013 copies to this video data with the corresponding wicket in this terminal, and then to the coding video data of whole video template, thereby can obtain comprising the encoded video data of the video data at all terminals; This encoded video data is sent to each terminal through server data Transmit-Receive Unit 201, thereby can on each terminal, realize checking a plurality of terminal datas.
The information transferring method of frequency conference system of the present invention; Owing to adopted the video template to synthesize the data that each terminal sends over; Effectively reduce code check, especially during the HD video more than transmitting two paths, adopt the synthetic mode of this template can effectively reduce the descending pressure at terminal.
In actual use; Because each terminal possibly adopt the coded system of oneself to encode respectively; The resolution of the video data that it sends over maybe be corresponding with it the video size of subwindow do not conform to, cause this video data is being duplicated the past tense display abnormality, can not show or can not normal viewing; To this; In the present invention program, can also include: adaptability identifying unit 2014 is used for judging that the video size of the subwindow that the resolution of video data is corresponding with said current video template adapts.
At this moment, above-mentioned server data Transmit-Receive Unit 2011 also is used in the result of determination of adaptability judging unit 2014 sending the resolution notice of change to the terminal of correspondence for not the time;
Above-mentioned each terminal 202 also is used for the resolution according to the video data of said resolution notice of change change output.
When concrete the realization; After server data Transmit-Receive Unit 2011 receives the video data that the terminal sends over, the resolution that adaptability judging unit 2014 is judged earlier this video data whether with the video size of the subwindow at this terminal, if adapt; Then composite coding unit 2012 copies to this video data in the subwindow corresponding with this terminal in the current video template; If incompatible, then server data Transmit-Receive Unit 2011 sends the resolution notice of change to this terminal, requires the terminal with the output of encoding of the video size of this subwindow; After the terminal receives, change the resolution of the video data of output according to the resolution notice of change that receives.
Because being the video size of the subwindow corresponding with it, the resolution of the video data that send at each terminal adapts; It need not as existing mode, to send the video data of highest resolution; Effectively reduced the data volume of sending data; Effectively utilize upstream bandwidth, under the situation that guarantees picture quality, effectively reduced the pressure of upstream bandwidth.
In addition, use the present invention program, can also make amendment to above-mentioned video template, that is:
Above-mentioned terminal 202 also is used for sending the instruction of change templates to server end 201, and the width that sends according to the server end that receives 201, the resolution of the video data of change coding output highly, and the change template is here instructed and comprised above-mentioned template ID;
Above-mentioned server data Transmit-Receive Unit 2011 also is used to receive the instruction of said change template, and the width of the subwindow that changes of the video size that said adaptability identifying unit 2014 is confirmed, highly sends to corresponding terminal;
Above-mentioned modular unit 2012 also is used for the video template that said template ID is corresponding and is set at said current video template;
Above-mentioned adaptability identifying unit 2014 is used for also judging whether the video size of each subwindow of the current video template after change changes.
In the process of a concrete change template, the instruction of change template is sent to server end in terminal 202, comprises the template ID of the video template after the change during this change template is instructed; The server data Transmit-Receive Unit 2011 of server end 201 receives and should the change template instruct, and subsequently, the corresponding video template of template ID during modular unit 2012 will instruct according to this change template instruction is set at the current video template; Adaptability identifying unit 2014 is judged behind the video template replacement; Whether the video size of the subwindow that the video size of the subwindow of the preceding correspondence of each terminal replacing is corresponding with changing the back is identical, as if identical, explains that then video size does not change; Can let this terminal according to the output of encoding of current resolution; Like difference, explain that then video size changes, if still encode one that output can cause showing with current resolution; Therefore; The width of the subwindow of the video template after will changing through server data Transmit-Receive Unit 2011, highly send to corresponding terminal, this terminal is according to the resolution of the video data of the height that receives, width adjustment output, to guarantee the normal demonstration of video.
Under this applicable cases; Modular unit 2012 can be provided with a plurality of video templates in advance; Each video template has the template ID of a correspondence respectively, when video conferencing system comes into operation, can pass through the template ID confession user selection at the terminal with each video template of menu or other forms at each terminal; The user can send this change template instruction through the mode that menu is selected, and concrete implementation does not repeat them here.
Wherein, The function that the above-mentioned video data that the terminal that receives is sent and the adaptability of corresponding subwindow are judged and receive the change template instruct after to the function of the adaptability judgement of video size; In some concrete video conferencing systems; Can be only to have wherein a kind of function, but under preferable case, be to have this two kinds of functions simultaneously.
In addition, because the difference of concrete network environment, network condition possibly can change at any time; For example the network appearance is congested, causes packet loss to raise or the like, in the case; Thereby the time-delay that may cause data to transmit if still send each terminal to the encoded video data of identical frame per second, will certainly cause the lengthening of delay time; Influence the real-time effect of video conference, therefore, in the present invention program:
Above-mentioned terminal 202 also is used for the packet loss to server end 201 these terminals of feedback;
Above-mentioned server data Transmit-Receive Unit 201 also is used to receive the packet loss that send at each terminal;
Above-mentioned composite coding unit 2013; Also be used for the time the coding video data of whole current video template; Generate the encoded video data of multiple frame per second; And the frame per second of the video of confirming according to the current packet loss in terminal to send, and these frame per second corresponding codes rear video data are sent to this terminal through said server data Transmit-Receive Unit to this terminal.
In a concrete example; Can these frame per second be set to 2fps, 5fps, 10fps, 15fps, 20fps, 25fps, 30fps; Promptly when the figure of whole video template is encoded; Can generate the encoded video data of frame per second such as 2fps, 5fps, 10fps, 15fps, 20fps, 25fps, 30fps, correspondingly, the selected mode of frame per second can be set at following mode:
At packet loss is 0 o'clock, and selected frame per second is the encoded video data of 30fps;
Greater than 0 and smaller or equal to 5% o'clock, selecting frame per second is the encoded video data of 25fps at packet loss;
Greater than 5% and smaller or equal to 10% o'clock, selecting frame per second is the encoded video data of 20fps at packet loss;
Greater than 10% and smaller or equal to 15% o'clock, selecting frame per second is the encoded video data of 15fps at packet loss;
Greater than 15% and smaller or equal to 20% o'clock, selecting frame per second is the encoded video data of 10fps at packet loss;
Greater than 20% and smaller or equal to 25% o'clock, selecting frame per second is the encoded video data of 5fps at packet loss;
Greater than 25% o'clock, selecting frame per second was the encoded video data of 2fps at packet loss.
Above-described embodiment of the present invention only is the explanation to one of them preferred forms of the present invention, does not constitute the qualification to protection range of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection range of the present invention.
Claims (7)
1. the information transferring method of a video conferencing system is characterized in that, comprises step:
Receive the video data that send at each terminal;
Whether the video size of corresponding subwindow adapts in the resolution of judging video data and the current video template; If not; The resolution notice of change is sent at terminal to correspondence, and this terminal is according to the resolution of the video data of said resolution notice of change change output;
Number each said video data is copied to subwindow corresponding with each terminal in the current video template respectively according to the video channel at each terminal;
To the coding video data of whole said current video template, and send encoded video data to each said terminal.
2. the information transferring method of video conferencing system according to claim 1 is characterized in that, also comprises step:
The change template instruction that receiving terminal sends is set at said current video template with the corresponding video template of template ID in the said change template instruction; And the width of the subwindow that changes of the video size in the current video template after will changing, highly sending to corresponding terminal, this terminal is according to the width that receives, highly change the resolution of the video data of coding output.
3. the information transferring method of video conferencing system according to claim 1 is characterized in that,
To the coding video data of whole said current video template the time, generate the encoded video data of two or more frame per second;
The packet loss of receiving terminal feedback, and the frame per second of the encoded video data of confirming according to the current packet loss in terminal to send to this terminal, and these frame per second corresponding codes rear video data are sent to this terminal.
4. the information transferring method of video conferencing system according to claim 3 is characterized in that:
The encoded video data of said two or more frame per second comprises that frame per second is the encoded video data of 2fps, 5fps, 10fps, 15fps, 20fps, 25fps, 30fps;
The frame per second of the encoded video data of confirming according to the current packet loss in terminal to send to this terminal specifically comprises:
At packet loss is 0 o'clock, and selected frame per second is the encoded video data of 30fps;
Greater than 0 and smaller or equal to 5% o'clock, selecting frame per second is the encoded video data of 25fps at packet loss;
Greater than 5% and smaller or equal to 10% o'clock, selecting frame per second is the encoded video data of 20fps at packet loss;
Greater than 10% and smaller or equal to 15% o'clock, selecting frame per second is the encoded video data of 15fps at packet loss;
Greater than 15% and smaller or equal to 20% o'clock, selecting frame per second is the encoded video data of 10fps at packet loss;
Greater than 20% and smaller or equal to 25% o'clock, selecting frame per second is the encoded video data of 5fps at packet loss;
Greater than 25% o'clock, selecting frame per second was the encoded video data of 2fps at packet loss.
5. a video conferencing system comprises server end and plural terminal, it is characterized in that,
Said server end; Be used to receive the video data that send at each terminal; Number each said video data is copied to subwindow corresponding with each terminal in the current video template respectively according to the video channel at each terminal; To the coding video data of whole said current video template, and send encoded video data to each terminal;
Said server end specifically comprises:
The server data Transmit-Receive Unit; Be used to receive the video data that send at each terminal; And send the encoded video data of composite coding unit to each terminal, also be used in the result of determination of adaptability judging unit sending the resolution notice of change to the terminal of correspondence for not the time;
The adaptability identifying unit is used for judging that the video size of the subwindow that the resolution of video data is whether corresponding with said current video template adapts;
Modular unit is used to store and set the current video template of current use;
The composite coding unit is used for number each said video data being copied to the said current video template subwindow corresponding with each terminal respectively according to the video channel at each terminal, to the coding video data of whole said current video template;
Said terminal; Video data local when being used for video conference sends to said server end; Receive the encoded video data that said server end sends; And to showing after this encoded video data decoding, said terminal also is used for the resolution according to the video data of said resolution notice of change change output.
6. video conferencing system according to claim 5 is characterized in that:
Said terminal also is used for sending the instruction of change template to said server end, and the width that sends according to the said server end that receives, the resolution of the video data of change coding output highly, and said change template is instructed and comprised template ID;
Said server data Transmit-Receive Unit also is used to receive the instruction of said change template, and the width of the subwindow that changes of the video size that said adaptability identifying unit is confirmed, highly sends to corresponding terminal;
Said modular unit also is used for the video template that said template ID is corresponding and is set at said current video template;
Said adaptability identifying unit is used for also judging whether the video size of each subwindow of the current video template after change changes.
7. according to claim 5 or 6 described video conferencing systems, it is characterized in that,
Said terminal also is used for the packet loss to this terminal of said server end feedback;
Said server data Transmit-Receive Unit also is used to receive said packet loss;
Said composite coding unit; Also be used for the time the coding video data of whole said current video template; Generate the encoded video data of two or more frame per second; And the frame per second of the video of confirming according to the current packet loss in terminal to send, and these frame per second corresponding codes rear video data are sent to this terminal through said server data Transmit-Receive Unit to this terminal.
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