CN103702063A - Method for realizing dynamic media negotiation in video conference system - Google Patents
Method for realizing dynamic media negotiation in video conference system Download PDFInfo
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- CN103702063A CN103702063A CN201310723710.2A CN201310723710A CN103702063A CN 103702063 A CN103702063 A CN 103702063A CN 201310723710 A CN201310723710 A CN 201310723710A CN 103702063 A CN103702063 A CN 103702063A
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Abstract
The invention discloses a method for realizing dynamic media negotiation in a video conference system. The video conference system consists of a signaling control unit, a media service unit and user terminals. A conversation establishment process is completed by the signaling control unit and the user terminal through an SIP (Session Initiation Protocol), and after the media service unit completes the coded format negotiation, the signaling control unit informs the terminal of a negotiation result; when new user terminals sequentially apply to join in a conference, a media control unit compares a supported coded format set with a coded format, selected by the current conference, for negotiating, and selects a coded format supported by all the terminals as a new conference coded format. As long as the coded format supported by all the user terminals of the system exists, the user terminals can access to the video conference whatever any scene or the joined sequence under the situation of not needing video transcoding, so that the flexibility and usability of the video conference system can be improved.
Description
Technical field
The present invention relates to a kind of method that dynamic media is consulted that realizes in video conferencing system, belong to multimedia communication technology field.
Background technology
Video conferencing system (Video Conference System) refers to two or more different local individual or colonies, by existing various telecom communication transmission mediums, the multiple data such as personage's quiet, dynamic image, voice, word, picture are distributed on each user's computer, make the user that disperses geographically can copolymerization one place, by various ways exchange of information such as figure, sound, increase the understandability of both sides to content.
Video conference is as current state-of-the-art mechanics of communication, only need be by the Internet, can realize teleconference, the office of efficient high definition, lasting lifting user, link up the aspects such as efficiency, reduction enterprise traveling expense cost, raising management performance and there is advantageous advantage, become the newest mode of telecommuting.
At present, along with popularizing of video conferencing system, video conferencing system is selected by increasing enterprise, and uses the conference terminal of video conferencing system also constantly to increase.Existing video conferencing system is supported multipart video-meeting, supports the terminal access of different manufacturers, different model.In video conference process of establishing, if there is successively different user terminals to add, generally can consult to establish a kind of video code model, but what may now select is not most suitable Video coding mode, in meeting process of establishing or after meeting foundation, may need to change.For example, X is supported in current video meeting, Y, and tri-kinds of coded formats of Z, wherein have A to support X, Y, tri-kinds of coded formats of Z, B supports X, two kinds of Video coding modes of Y, C supports Y, two kinds of coded systems of Z, D terminal is supported Y coded system.A, in B priority accessing conference, through consultation, has selected X coded system.Now, if C and D will access active conference, need to use Y coded system.For supporting C and D accessing conference, current conference system generally can only adopt the mode of transcoding to realize, and, in this meeting, A and B are used X coded format, and C and D are used Y coded format, realize video interconnection each other by transcoding.
But transcoding mode need to take the software and hardware resources of system, especially, when conference member quantity is many, systematic function is had to considerable influence, can not effectively meet the demand of user terminal to video conference.
Summary of the invention
For the deficiencies in the prior art, technical problem to be solved by this invention is to provide a kind of method that dynamic media is consulted that realizes in video conferencing system.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
In video conferencing system, realize the method that dynamic media is consulted, this video conferencing system comprises signaling control unit, media services unit and user terminal.When first user terminal application adds meeting, described signaling control unit records the coded format set of its support and sends to described media services unit, media services unit contrasts negotiation by its record and with the coded format set that meeting itself is supported, negotiation result is sent to signaling control unit, notify first user terminal to add meeting success, other user terminals apply for adding meeting successively, the coded format that media control unit is chosen coded format set and the active conference of its support compares, if in the video code model set that the coded format that active conference is chosen is supported at user terminal, choose the coded format of active conference as coded format negotiation result, if in the video code model set that the coded format that active conference is chosen is not supported at user terminal, the coded format set that application is added to user terminal, the coded format set of all terminal supports that added in meeting is therewith held consultation, choose coded format that all terminals all support as new meeting coded format.
Wherein more preferably, described signaling control unit is connected with described user terminal with described media services unit respectively by IP network.
Wherein more preferably, described media services unit comprises logging modle and message processing module;
The video code model set of the user terminal that wherein, described logging modle reception signaling control unit sends is also carried out record to it;
Described message processing module extracts the coded system set of the video code model set of described user terminal support and meeting support itself to hold consultation from described logging modle, choose video code model that both sides all support as negotiation result, send result to described logging modle and carry out record, by negotiation result, by IP network, notify described signaling control unit simultaneously.
Wherein more preferably, when having new user terminal application to add meeting, the coded format set of all each self-supportings of terminal that the coded format of user terminal support has added in meeting is therewith held consultation, if do not negotiate the coded system that all user terminals are all supported, notify described signaling control unit, this user terminal adds meeting unsuccessful, and described signaling control unit is refused its calling.
Wherein more preferably, when change occurs meeting coded format, described signaling control unit receives that meeting coded format changes message, travels through all user terminals that added meeting, carries out successively following operation:
1) send change message to adding the user terminal of meeting, notify the meeting coded format after its negotiation;
2) added the user terminal of meeting to receive that changing message holds consultation, and consults successful acknowledge message and notifies described signaling control unit;
3) signaling control unit is received after acknowledge message, notifies described media services unit to add the coded format of the user terminal of meeting to change successfully;
4) media services unit is by the current coded format notice signaling control unit of choosing of meeting.Signaling control unit applies for by consulting coded format notice the user terminal adding by acknowledge message, and this user terminal joins in video conference, and terminal changes to new meeting coded format by the coded format of negotiation, continues to participate in video conference.
Wherein more preferably, in the situation that user terminal is all supported, in conference process, do not have new user terminal to add fashionable, according to meeting demand, complete the change to meeting coded format.
Utilize the method that dynamic media is consulted that realizes provided by the present invention in video conferencing system, fashionable when having new user terminal to add in video conference process, without carrying out video code conversion, as long as the mode of passing through as required dynamic negotiation is readjusted the coded format of whole meeting, just can make all user terminals participate in video conference, effectively meet the demand of user terminal to video conference.
Accompanying drawing explanation
Fig. 1 is for supporting the structural representation of the video conferencing system of dynamic negotiation;
In the video conferencing system of Fig. 2 for support dynamic negotiation, the flow chart that terminal adds;
Fig. 3 is after media services unit receives that terminal joins request, and carries out the flow chart of coded format dynamic negotiation.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is elaborated.
The invention provides a kind of method that dynamic media is consulted that realizes in video conferencing system.This video conferencing system comprises signaling control unit, media services unit and user terminal.First user terminal is notified signaling control unit by sending request information by the coded format set of its support, application adds meeting, signaling control unit is by its record, and send to media services unit, the coded format set that media services unit record user terminal is supported, and the coded system set that itself and meeting itself are supported contrast negotiation, negotiation result is sent to signaling control unit, notify first user terminal to add video conference successfully.Other user terminals send request successively information and notify signaling control unit by the coded format set of its support, application adds meeting, the coded format that media control unit is chosen coded format set and the active conference of its support compares, if in the video code model set that the coded format that active conference is chosen is supported at user terminal, choose the coded format of active conference as coded format negotiation result, if in the video code model set that the coded format that active conference is chosen is not supported at user terminal, to newly add the set of terminal coded format, the coded format set of all terminal supports that added in meeting is therewith held consultation, choose coded format that all terminals all support as meeting coded format.Said process is carried out to detailed specific description below.
As shown in Figure 1, realize in the method for dynamic media negotiation in video conferencing system provided by the invention, video conferencing system comprises signaling control unit, media services unit and user terminal (abbreviation terminal).Signaling control unit is connected with user terminal with media services unit respectively by IP network.Wherein, user terminal is visual user terminal.SIP (Session Initiation Protocol) agreement is the signaling control protocol of an application layer, for creating, revise and discharge one or more participants' session.Session Initiation Protocol employing SDP(Session Description Protocal) session ability of terminal equipment is described.
Signaling control unit and user terminal complete call process of establishing by Session Initiation Protocol.In media services unit, complete after coded format negotiation, then by signaling control unit informing user terminal negotiation result.Wherein, user terminal is notified signaling control unit by the INVITE solicited message sending by the coded format set of its support, and application adds meeting, and waits for the announcement information of signaling control unit.
Signaling control unit receives the INVITE solicited message that user terminal sends, the video code model set of recording user terminal, and sending it to the operation of holding consultation of media services unit, the negotiation result that media services unit is sent is by each user terminal of 200OK message informing.
Media services unit comprises logging modle and message processing module.Wherein logging modle is in order to the video code model set of the user terminal that receives signaling control unit and send and it is carried out to record.Message processing module extracts the coded system set of the video code model set of user terminal and meeting support itself to hold consultation from logging modle, choose video code model that a kind of both sides all support as negotiation result, send result to logging modle and carry out record, negotiation result is passed through to IP network notice signaling control unit simultaneously.
As shown in Figure 2, in the constructive process of video conference, signaling control unit and media services unit complete associative operation alternately.Concrete steps are as follows:
Step 1: in video conference, first user terminal is by INVITE notice signaling control unit, and application adds meeting, comprises all video code model set itself that support in the SDP information that it carries.In embodiment provided by the present invention, first user terminal A is supported X and two kinds of coded formats of Y.
Step 2: signaling control unit records the coded format set that this user terminal A supports and notifies media services unit, the video code model set that the logging modle recording user terminal A of media services unit supports.Message processing module extracts the coded system set of the video code model set of user terminal A and meeting support itself to hold consultation from logging modle, choose video code model X that a kind of both sides all support as negotiation result, recording X is the current coded format of choosing of meeting, send result to logging modle and carry out record, and notice signaling control unit.Signaling control unit will be consulted coded format informing user terminal A by 200OK message, and this user terminal joins in video conference.
Step 3: in meeting, other user terminals send INVITE notice signaling control unit successively, application adds meeting, and it carries all video code model set that comprise support own in SDP information.In embodiment provided by the present invention, user terminal B request adds video conference, and it supports Y and two kinds of coded formats of Z.
Step 4: signaling control unit is received the information that joins request of user terminal B, notifies media services unit by all video code model set of its support.
Step 5: hold consultation itself and the current coded format of choosing of meeting (with reference to Fig. 3) in media services unit, concrete negotiations process is as follows:
In the video code model set that the coded format that a) if active conference is chosen is supported at user terminal, choose the coded format of active conference as coded format negotiation result, notice signaling control unit, and by signaling control unit, by 200OK message, will consult coded format and notify this user terminal, this user terminal joins in video conference, continue to process the next user terminal information that joins request;
B) if in the video code model set that the coded format that active conference is chosen is not supported at user terminal, proceed to coded format dynamic negotiation process step 6;
Step 6: will newly add the set of user terminal coded format, the coded format set of all each self-supportings of terminal that added in meeting is therewith held consultation, if can negotiate the coded format that all user terminals are all supported, choose this coded format as meeting coded format.Notice signaling control unit meeting coded format changes, and proceeds to step 7; If can not negotiate the coded system that a kind of all user terminals are all supported, notice signaling control unit, this user terminal adds meeting unsuccessful, by signaling control unit, refuses its calling.By the method for dynamic negotiation, make have new user terminal to add in video conference process fashionable, without carrying out video code conversion, as long as readjust as required the coded format of whole meeting, just can make all user terminals all participate in video conference, effectively improve the flexibility of video conferencing system, reduced the taking of system resource, met the demand of user to video conference.
In embodiment provided by the present invention, the coded format that the user terminal B that newly adds supports is Y and Z, holds consultation with the user terminal A having added in meeting, can select coded format Y that both sides all support as new meeting coded format.Notice signaling control unit meeting coded format in media services unit changes, and proceeds to step 7.
Step 7: signaling control unit receives that meeting coded format changes message, travels through all user terminals that added meeting, carries out successively following operation:
A) send REINVITE message to adding the user terminal of meeting, in its SDP information, carry the meeting coded format after negotiation.
B) add the user terminal of meeting to receive that REINVITE message carries out SDP negotiation, consulted successful 200OK message informing signaling control unit.
C), after signaling control unit is received 200OK message, notice media services unit has added the coded format of the user terminal of meeting to change successfully.
D) media services unit is by the current coded format notice signaling control unit of choosing of meeting.Signaling control unit will be consulted coded format informing user terminal by 200OK message, and this user terminal joins in video conference.After this, terminal changes to new meeting coded format by the coded format of negotiation, continues to participate in video conference.
When having new user terminal, video conference adds, in the time of need to changing video conference coded format or in video conference process, although there is no adding of new terminal, but due to meeting security needs or while artificially needing to change the coded format of video conference, for having added successful user terminal in video conference, by sending REINVITE message to it, in its SDP information, carry coded format after changing, dynamically complete coded format change with terminal.In the situation that user terminal is all supported, if necessary, can repeatedly change meeting coded format according to method of the present invention, improved flexibility and the availability of video conferencing system, improved the fail safe of video conference simultaneously.
The method that dynamic media is consulted, a kind of coded format that all terminals of Dynamic Selection are all supported of realizing in video conferencing system provided by the present invention.As long as the coded format that exists all user terminals of native system all to support, so in the situation that not needing to carry out video code conversion, these user terminals are no matter which kind of scene and the sequencing that adds can be linked into video conference.Meanwhile, in video conference process, the mode that can pass through as required dynamic negotiation is readjusted the coded format of whole meeting, can effectively meet the demand of user terminal to video conference.
Above the method that realizes dynamic media negotiation in video conferencing system provided by the present invention is had been described in detail.To those skilled in the art, any apparent change of under the prerequisite that does not deviate from connotation of the present invention, it being done, all will form infringement of patent right of the present invention, will bear corresponding legal liabilities.
Claims (6)
1. in video conferencing system, realize the method that dynamic media is consulted, this video conferencing system comprises signaling control unit, media services unit and user terminal; When first user terminal application adds meeting, described signaling control unit records the coded format set of its support and sends to described media services unit, media services unit contrasts negotiation by its record and with the coded format set that meeting itself is supported, negotiation result is sent to signaling control unit, notify first user terminal to add meeting success; Other user terminals apply for adding meeting successively, the coded format that media control unit is chosen coded format set and the active conference of its support compares, if in the video code model set that the coded format that active conference is chosen is supported at user terminal, choose the coded format of active conference as coded format negotiation result, it is characterized in that:
If in the video code model set that the coded format that active conference is chosen is not supported at user terminal, the coded format set that application is added to user terminal, the coded format set of all terminal supports that added in meeting is therewith held consultation, and chooses coded format that all terminals all support as new meeting coded format.
2. as claimed in claim 1ly in video conferencing system, realize the method that dynamic media is consulted, it is characterized in that:
Described signaling control unit is connected with described user terminal with described media services unit respectively by IP network.
3. as claimed in claim 1ly in video conferencing system, realize the method that dynamic media is consulted, it is characterized in that:
Described media services unit comprises logging modle and message processing module;
The video code model set of the user terminal that wherein, described logging modle reception signaling control unit sends is also carried out record to it;
Described message processing module extracts the coded system set of the video code model set of described user terminal support and meeting support itself to hold consultation from described logging modle, choose video code model that both sides all support as negotiation result, send result to described logging modle and carry out record, by negotiation result, by IP network, notify described signaling control unit simultaneously.
4. as claimed in claim 1ly in video conferencing system, realize the method that dynamic media is consulted, it is characterized in that:
When having new user terminal application to add meeting, the coded format set of all each self-supportings of terminal that the coded format of user terminal support has added in meeting is therewith held consultation, if do not negotiate the coded system that all user terminals are all supported, notify described signaling control unit, this user terminal adds meeting unsuccessful, and described signaling control unit is refused its calling.
5. as claimed in claim 1ly in video conferencing system, realize the method that dynamic media is consulted, it is characterized in that:
When change occurs meeting coded format, described signaling control unit receives that meeting coded format changes message, travels through all user terminals that added meeting, carries out successively following operation:
1) send change message to adding the user terminal of meeting, notify the meeting coded format after its negotiation;
2) added the user terminal of meeting to receive that changing message holds consultation, and consults successful acknowledge message and notifies described signaling control unit;
3) signaling control unit is received after acknowledge message, notifies described media services unit to add the coded format of the user terminal of meeting to change successfully;
4) media services unit is by the current coded format notice signaling control unit of choosing of meeting, signaling control unit applies for by consulting coded format notice the user terminal adding by acknowledge message, this user terminal joins in video conference, terminal changes to new meeting coded format by the coded format of negotiation, continues to participate in video conference.
6. as claimed in claim 1ly in video conferencing system, realize the method that dynamic media is consulted, it is characterized in that:
In the situation that user terminal is all supported, in conference process, do not have new user terminal to add fashionable, according to meeting demand, complete the change to meeting coded format.
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| CN117692598A (en) * | 2024-02-04 | 2024-03-12 | 浙江华创视讯科技有限公司 | Video stream sending method and device |
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