CN101146208A - Terminal with built-in multiple-point control unit and its communication method - Google Patents
Terminal with built-in multiple-point control unit and its communication method Download PDFInfo
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Abstract
The invention relates to a terminal of a built-in multi-point control unit and a communication method thereof, wherein the terminal comprises an acquisition unit, a built-in multi-point control unit (MCU), an application unit and a multi-path video/audio coding/decoding processing unit. The acquisition unit is connected with the multi-path video/audio coding/decoding processing unit and used to collect video/audio data. The built-in MCU is connected with the application unit and the multi-path video/audio coding/decoding processing unit, and is used to transmit video/audio data according to at least one protocol in the multi-point communication and to control the multi-path video/audio coding/decoding processing unit to code and decode at least one path of video/audio data. The application unit is used to manage the point-to-point communication or multi-point communication. The multi-path video/audio coding/decoding processing unit is used to complete the coding/decoding operation of at least one path of video/audio data. The inventive terminal and the communication method thereof can complete two-point and multi-point communications, is flexible and convenient to use and helpful to reduce the cost of a video conference system.
Description
Technical field
The present invention relates to the TV conference system technical field, particularly relate to a kind of terminal and communication means thereof of built-in multipoint control unit.
Background technology
Fig. 1 is the topology diagram of TV conference system in the prior art, and as shown in Figure 1, TV conference system mainly comprises two kinds of functional entitys at present: multipoint control unit (MCU, Multipoint Control Unit) and terminal.MCU is the core of TV conference system, by multipoint controller (MC, MultipointController) and multiple spot processing unit (MP, Multipoint Processor) form.MC handles the method for all negotiation among terminals, determining common Voice ﹠ Video disposal ability, and by determining which Voice ﹠ Video data will carry out multiple spot multicast (Multicast), thereby realize conferencing resource is controlled.MP handles the mixing of video/audio data and the encoding and decoding of control multi-channel video voice data etc.In multipoint conference, MCU utilizes the transmission of MC control multi-channel video voice data, after MC receives the next video/audio data of distance terminal transmission, giving a plurality of video/audio decoding units by MP decodes, audio mixing, then according to the predetermined conference requirement, for example certain distance terminal can only obtain the video/audio data of other distance terminal of part, and certain distance terminal can obtain the video/audio data of all other distance terminals, control a plurality of video/audio coding units by MP and carry out the operation of encoding operation and audio mixing, and by MC with audio mixing, video/audio data behind the coding send to corresponding distance terminal according to differing transmission protocols.For example MCU is A, have terminal B, C and D, according to the predetermined conference requirement, B can obtain the video/audio of C and D, and C, D can only obtain the other side's video/audio, and then the video/audio data of B, C and D all are sent to A, finish the decoding of these three road video/audios data by A after, the video/audio data of C, D are carried out coding sends to B behind the audio mixing, send to D after the video/audio data of C are encoded, send to C after the video/audio data of D are encoded.
For terminal, it has collecting unit and single channel video/audio encoding and decoding processing unit, receiving only one road video/audio data decodes, for example receive only video/audio data in the centralized conference, also only send video/audio data after encoding toward a distance terminal or MCU from MCU.
In the prior art, MCU realizes that by a specific installation self does not have termination function, does not have collecting unit, also just can't provide multimedia messagess such as audio frequency, video separately; Therefore and it orientates specialized market as, costs an arm and a leg, system complex.And lack between the terminal under the situation of MCU, all can only set up point-to-point communication, can't realize the multi-point between a plurality of terminals.If, still use independent MCU to realize multi-point, can cause the tangible wasting of resources, and communications cost height, configuration are complicated, are unfavorable for the popularization of TV conference system for the small-scale TV conference system of having only small number of terminals to participate in.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of terminal and communication means thereof of built-in MCU.This terminal can be brought into play the effect of terminal and MCU simultaneously, and the terminal of described built-in MCU can provide point-to-point communication and two kinds of working methods of multi-point.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of terminal of built-in multipoint control unit, comprise collecting unit, built-in multipoint control unit, applying unit and multi-channel video audio coding decoding processing unit, wherein, collecting unit is connected to multi-channel video audio coding decoding processing unit, is used to gather the video/audio data; Built-in multipoint control unit connects applying unit and multi-channel video audio coding decoding processing unit, be used in communication according to one or more protocol transmission video/audio data, and control one road or one road above video/audio encoding and decoding processing unit one road or one road above video/audio data are carried out coding-decoding operation; Applying unit is used for management point point to-point communication or multi-point; Multi-channel video audio coding decoding processing unit is used to realize the coding-decoding operation of one road or one road above video/audio data.
Wherein, described built-in multipoint control unit comprises protocol adaptation unit, multipoint controller and multiple spot processing unit, and protocol adaptation unit is used to realize the transmission based on differing transmission protocols; Multipoint controller connection protocol adaptation unit and applying unit, be used at multi-point process control protocol adaptation unit according to more than one protocol transmission video/audio data, or in the point-to-point communication process control protocol adaptation unit according to certain protocol transmission video/audio data; The multiple spot processing unit connects applying unit and multi-channel video audio coding decoding processing unit, be used for multi-point process control more than one the tunnel video/audio encoding and decoding processing unit carry out coding-decoding operation to one the tunnel with the video/audio data of setting out on a journey, and the audio mixing operation that realizes video/audio data more than a tunnel, or control multi-channel video audio coding decoding processing unit carries out coding-decoding operation to single channel video/audio data in the point-to-point communication process.
A kind of multicast routing method of built-in multipoint control unit terminal, described method comprises step: A, create point-to-point meeting, call out distance terminal; B, treat the distance terminal call accepted after, and carry out the video/audio transfer of data between the distance terminal; C, call out other distance terminal once more, the change conference type is a multipoint conference; D, and an above distance terminal between carry out the video/audio transfer of data.
Wherein, described change conference type is multipoint conference operation comprises: utilize more than one agreements to realize the video/audio transfer of data; Realize the processing of video/audio data more than a tunnel.
Wherein, the operation of carrying out the video/audio transfer of data between described and above distance terminal comprises: described built-in multipoint control unit terminal receives after the video/audio data from each distance terminal, respectively the video/audio data of each distance terminal is carried out decoding processing; The collecting unit of described built-in multipoint control unit terminal collects after the video/audio data, require audio mixing with above-mentioned decoded video/audio data according to predetermined conference, corresponding then different distance terminals carry out encoding process respectively, with the coding after the video/audio transfer of data to each distance terminal.
The multicast routing method of the built-in multipoint control unit terminal of the present invention, further comprise behind the step D, if have distance terminal to withdraw from multipoint conference and this distance terminal is not last distance terminal of described multipoint conference, then stop to receive video/audio data from this distance terminal, and stop to send the video/audio data, and other distance terminal of notice multipoint conference toward this distance terminal; If last distance terminal that described built-in multipoint control unit terminal withdraws from multipoint conference or have distance terminal to withdraw from multipoint conference and this distance terminal is described multipoint conference then stops described multipoint conference, stop the video/audio transfer of data.
A kind of Point-to-point Communication Method of built-in multipoint control unit terminal, described method includes step: a, create point-to-point meeting, call out distance terminal or detect the calling of distance terminal; B, treat the distance terminal call accepted or accept distance terminal to call out after, and carry out the video/audio transfer of data between the distance terminal.
Wherein, the operation of the point-to-point meeting of described establishment comprises: initialization multipoint control unit, multipoint control unit are created point-to-point meeting.
The operation of described calling distance terminal comprises: receive the distance terminal information of described built-in multipoint control unit terminal use input, send calling to this distance terminal.
The operation of described video/audio transfer of data comprises: described built-in multipoint control unit terminal receives after the next video/audio data of distance terminal transmission, and described video/audio data are carried out decode operation; Or after the collecting unit of described built-in multipoint control unit terminal collects the video/audio data, the video/audio data that collected are encoded, the video/audio transfer of data after will encoding then is to distance terminal.
Behind the Point-to-point Communication Method step b of the built-in multipoint control unit terminal of the present invention, further comprise: described built-in multipoint control unit terminal or distance terminal stop meeting, stop the video/audio transfer of data.
The terminal of the built-in MCU that the present invention proposes possesses the function of terminal and MCU simultaneously, can finish point-to-point communication and multi-point, easy to use flexibly; Described terminal can be set up TV conference system on a small scale, removed TV conference system from and used independent MCU to finish multi-point, so the TV conference system cost is low, helps applying of TV conference system.
The communication means of the built-in MCU terminal that the present invention proposes, can realize communication between point-to-point and the communication between the multiple spot, and can switch to the multi-point mode from the point-to-point communication working method easily and flexibly, realize easily, help applying of TV conference system.
Description of drawings
Fig. 1 is the topology diagram of TV conference system in the prior art;
Fig. 2 is the terminal structure figure of built-in MCU of the present invention;
Fig. 3 realizes the flow chart of point-to-point communication for the terminal caller of built-in MCU of the present invention;
Fig. 4 is the flow chart of the terminal called realization point-to-point communication of built-in MCU of the present invention;
Fig. 5 realizes the flow chart of multi-point for the terminal of built-in MCU of the present invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Core concept of the present invention is: to the functional unit of terminal interpolation MCU, make this terminal when realizing point-to-point communication, finish termination function, and this terminal also possesses the function of MCU when realizing multi-point.
Fig. 2 is the terminal structure figure of built-in MCU of the present invention, and as shown in Figure 2, built-in MCU terminal of the present invention comprises collecting unit, built-in MCU, applying unit and multi-channel video audio coding decoding processing unit, wherein:
Collecting unit is connected to multi-channel video audio coding decoding processing unit, is used to gather the video/audio data.
Built-in MCU connects applying unit and multi-channel video audio coding decoding processing unit, be used in communication according to one or more protocol transmission video/audio data, and control one road or one road above video/audio encoding and decoding processing unit one road or one road above video/audio data are carried out coding-decoding operation.Described built-in MCU specifically comprises protocol adaptation unit, MC and MP.
Protocol adaptation unit is used to realize the communication based on differing transmission protocols, the H.323 agreement of IP based network for example, or based on E1 or integrated digital service network (ISDN, Integrated Services DigitalNetwork) the H.320 agreement of network, or session startup agreement (SIP, Session Initiation Protocol) etc.
MC connection protocol adaptation unit and applying unit, be used at multi-point process control protocol adaptation unit according to one or more protocol transmission video/audio data, or in the point-to-point communication process control protocol adaptation unit according to a kind of protocol transmission video/audio data.
MP connects applying unit and multi-channel video audio coding decoding processing unit, be used for multi-point process control more than one the tunnel video/audio encoding and decoding processing unit video/audio data more than a tunnel are carried out coding-decoding operation, and realize that the audio mixing of video/audio data one tunnel or more operates; Or control multi-channel video audio coding decoding processing unit carries out coding-decoding operation to single channel video/audio data in the point-to-point communication process.
Applying unit connects MC and MP, is used for management point point to-point communication or multi-point.
Multi-channel video audio coding decoding processing unit is used to realize the processing of one road or one road above video/audio data, described processing to one road video/audio data mainly refers to the next video/audio data of distance terminal transmission of point-to-point communication are carried out decode operation and the video/audio data that described built-in MCU terminal (being also referred to as the local terminal) collects are carried out encoding operation; Described processing to video/audio data more than a tunnel refers to that mainly each distance terminal of multi-point transmits the video/audio data of coming and carries out decode operation; With according to the predetermined conference requirement, the video/audio data of selected segment distal terminal were carried out audio mixing and encoding operation during video/audio data that the local terminal is collected and predetermined conference required, described selected some distance terminals that are meant can only obtain the video/audio data of other distance terminal of part by the predetermined conference requirement, then according to the video/audio data audio mixing of the selected segment distal terminal of this requirements, transfer to this distance terminal after encoding.
Fig. 3 is the flow chart of the terminal caller realization point-to-point communication of built-in MCU of the present invention, and as shown in Figure 3, point-to-point communication comprises the steps:
Step 101: initialization MC, MC create point-to-point meeting.
Described MC creates point-to-point meeting, is meant that applying unit notice MC creates meeting, and MC notification protocol adaptation unit carries out operations such as initialization and distributing system resource according to the agreement of applying unit appointment.
Step 102: receive the distance terminal information of local terminal user input, send calling to this distance terminal.
Applying unit receives the distance terminal information of local terminal user input, for example after IP address, the port numbers etc., promptly notify MC to call out, MC sends call request by protocol adaptation unit, compatible in described call request and the prior art, therefore distance terminal both can be the terminal of built-in MCU among another the present invention, also can be ordinary terminal.
Step 103: after treating the distance terminal call accepted, MC sets up the video/audio passage.
After treating the distance terminal call accepted, MC notification protocol adaptation unit is set up the video/audio passage according to selected agreement in the step 101, described video/audio passage is used to receive the video/audio data that the distance terminal transmission comes, or be used for to distance terminal transmission of video voice data, MC sets up after the video/audio passage, has set up the video/audio channel information to the applying unit notice.
Step 104: applying unit starts multi-channel video audio coding decoding processing unit.
Applying unit receives to be set up after the video/audio passage, promptly notifies multi-channel video audio coding decoding processing unit to start working.
Step 105: and carry out the video/audio transfer of data between the distance terminal.
After the collecting unit of local terminal collects the video/audio data, by multi-channel video audio coding decoding processing unit it is encoded, be transferred to applying unit via MP then, the video/audio transfer of data after applying unit control MC will encode by protocol adaptation unit is to distance terminal; The protocol adaptation unit of local terminal receives after the next video/audio data of distance terminal transmission by the video/audio passage, be transferred to applying unit through MC, be transferred to MP by applying unit, MP control multi-channel video audio coding decoding processing unit carries out decode operation to the video/audio data that described distance terminal transmission comes then.
Step 106: local terminal or distance terminal withdraw from point-to-point meeting, then stop meeting.
The operation of described termination meeting comprises: multi-channel video audio coding decoding processing unit stops the coding-decoding operation of video/audio data, MP stop and applying unit between the video/audio exchanges data, MC notification protocol adaptation unit is closed the video/audio passage, discharges resource.
Fig. 4 is the flow chart of the terminal called realization point-to-point communication of built-in MCU of the present invention, and as shown in Figure 4, the step of called realization point-to-point communication is:
Step 201: initialization MC, MC create point-to-point meeting.
Described MC creates point-to-point meeting, is meant that applying unit notice MC creates meeting, and MC notification protocol adaptation unit carries out operations such as initialization and distributing system resource according to the agreement of applying unit appointment.
After step 202:MC has detected the distance terminal calling, the applying unit call accepted.
After MC detected the call request that distance terminal transmission comes by protocol adaptation unit, the information of notice applying unit distance terminal was selected whether call accepted by applying unit.
Step 203: after treating the applying unit call accepted, MC sets up the video/audio passage.
After treating the applying unit call accepted, the MC notification protocol adaptation unit of local terminal is set up the video/audio passage according to selected agreement in the step 201, be used to receive the video/audio data that the distance terminal transmission comes, or be used for to distance terminal transmission of video voice data, the MC of local terminal sets up after the video/audio passage, has set up the video/audio channel information to the applying unit notice.
Step 204: applying unit starts multi-channel video audio coding decoding processing unit.
Applying unit receives to be set up after the video/audio passage, promptly notifies multi-channel video audio coding decoding processing unit to start working.
Step 205: and carry out the video/audio transfer of data between the distance terminal.
The agreement video unit of local terminal receives after the next video/audio data of distance terminal transmission by the video/audio passage, be transferred to applying unit through MC, be transferred to MP by applying unit, MP control multi-channel video audio coding decoding processing unit carries out decode operation to the video/audio data that described distance terminal transmission comes then; After the collecting unit of local terminal collects the video/audio data of local terminal, by multi-channel video audio coding decoding processing unit it is encoded, be transferred to applying unit via MP then, the video/audio transfer of data after applying unit control MC will encode by protocol adaptation unit is to distance terminal.
Step 206: local terminal or distance terminal withdraw from point-to-point meeting, then stop meeting.
The operation of described termination meeting comprises: multi-channel video audio coding decoding processing unit stops the coding-decoding operation of video/audio data, MP stop and applying unit between the video/audio exchanges data, MC notification protocol adaptation unit is closed the video/audio passage, discharges resource.
Fig. 5 realizes the flow chart of multi-point for the terminal of built-in MCU of the present invention, because this moment, described terminal realized the function of terminal and MCU simultaneously, so this terminal can only realize multi-point by caller, as shown in Figure 5, the terminal of built-in MCU realizes that multi-point may further comprise the steps:
Step 301: set up point-to-point meeting.
Describedly set up point-to-point meeting, and set up point-to-point meeting between a distance terminal with aforementioned step 101～step 105.
Step 302: continue to call out other distance terminal.
Continue to call out other distance terminal, the step of described calling is with step 102.
Step 303: after treating other distance terminal call accepted, MC, MP and multi-channel video audio coding decoding processing unit change mode of operation, distribute distance terminal number.
Described MC, MP and multi-channel video audio coding decoding processing unit change mode of operation, MC control protocol adaptation unit adopts more than one protocol transmission data, MP control multi-channel video audio coding decoding processing unit is finished the Code And Decode of video/audio data more than a tunnel, and the audio mixing of realizing the video/audio data, multi-channel video audio coding decoding processing unit carries out encoding operation and decode operation to video/audio data more than a tunnel simultaneously.
In multipoint conference, MC can distribute distance terminal number to an above distance terminal, with the source of realizing the video/audio data and the sign of purpose.
Step 304:MC increases the video/audio passage.
MC is according to the distance terminal number of participating in multipoint conference, and the host-host protocol that the control protocol adaptation unit is followed according to distance terminal increases the video/audio passage.
Step 305: and carry out the video/audio transfer of data between an above distance terminal.
Carrying out the video/audio transfer of data mutually between the described and distance terminal comprises: protocol adaptation unit receives after the video/audio data from each video/audio passage, be transferred to applying unit via MC, applying unit is transferred to multi-channel video audio coding decoding processing unit with these multi-channel video voice datas by MP and carries out decoding processing respectively; The collecting unit of local terminal collects after the video/audio data, requires and above-mentioned decoded video/audio data audio mixing together according to predetermined conference, carries out encoding process respectively by the corresponding different distance terminals of multi-channel video audio coding decoding processing unit then; Video/audio transfer of data behind the coding is given applying unit, applying unit control MC by the video/audio transfer of data of protocol adaptation unit after with described coding to each distance terminal.
For example, the terminal of built-in MCU is A, multipoint conference has B, C participates in, according to the predetermined conference requirement, B can receive the video/audio data of A and C simultaneously, and C only can receive the video/audio data of A, B then, the video/audio data of C all mail to A, a plurality of video/audio passages of A receive after these video/audio data, finish the decode operation of this two-path video voice data respectively by its multi-channel video audio coding decoding processing unit, after the collecting unit of A collects the video/audio data of A this locality then, the video/audio data of A and C are carried out audio mixing, be transferred to B behind the coding, and only be transferred to C after the video/audio digital coding with A.
Step 306: if having distance terminal to withdraw from multipoint conference and this distance terminal is not last distance terminal of described multipoint conference, then stop to receive video/audio data from this distance terminal, send the video/audio data with stopping toward this distance terminal, and other distance terminal of notice multipoint conference; If last distance terminal that described built-in multipoint control unit terminal withdraws from multipoint conference or have distance terminal to withdraw from multipoint conference and this distance terminal is described multipoint conference then stops described multipoint conference, stop the video/audio transfer of data.
As above C withdraws from multipoint conference in the example, this moment, the multipoint conference distance terminal also included B, then multipoint conference can't stop, and only stops to receive from the video/audio data of C and stops to send the video/audio data toward C, and notice B, if this moment, B also withdrawed from multipoint conference, or A oneself withdraws from multipoint conference, then stops described multipoint conference, stop all video/audio transfer of data, described terminating operation is with step 106 or step 206.
The above is preferred embodiment of the present invention only, is not to be used for limiting protection scope of the present invention.Those skilled in that art should be able to associate; the terminal of described built-in MCU can be supported more host-host protocols; the terminal of described built-in MCU sends call request by different agreement; by different modes the video/audio data are carried out coding-decoding operation, and other is equal to accordingly to change or replace and all should belongs to protection scope of the present invention according to technical scheme of the present invention and design thereof.
Claims (11)
1. the terminal of a built-in multipoint control unit comprises collecting unit, it is characterized in that, described terminal also comprises built-in multipoint control unit, applying unit and multi-channel video audio coding decoding processing unit, wherein,
Collecting unit is connected to multi-channel video audio coding decoding processing unit, is used to gather the video/audio data;
Built-in multipoint control unit connects applying unit and multi-channel video audio coding decoding processing unit, be used in communication according to one or more protocol transmission video/audio data, and control one road or one road above video/audio encoding and decoding processing unit one road or one road above video/audio data are carried out coding-decoding operation;
Applying unit is used for management point point to-point communication or multi-point;
Multi-channel video audio coding decoding processing unit is used to realize the coding-decoding operation of one road or one road above video/audio data.
2. the terminal of built-in multipoint control unit according to claim 1 is characterized in that, described built-in multipoint control unit comprises protocol adaptation unit, multipoint controller and multiple spot processing unit, wherein,
Protocol adaptation unit is used to realize the transmission based on differing transmission protocols;
Multipoint controller connection protocol adaptation unit and applying unit, be used at multi-point process control protocol adaptation unit according to more than one protocol transmission video/audio data, or in the point-to-point communication process control protocol adaptation unit according to certain protocol transmission video/audio data;
The multiple spot processing unit connects applying unit and multi-channel video audio coding decoding processing unit, be used for multi-point process control more than one the tunnel video/audio encoding and decoding processing unit carry out coding-decoding operation to one the tunnel with the video/audio data of setting out on a journey, and the audio mixing operation that realizes video/audio data more than a tunnel, or control multi-channel video audio coding decoding processing unit carries out coding-decoding operation to single channel video/audio data in the point-to-point communication process.
3. the multicast routing method of the described built-in multipoint control unit terminal of claim 1 is characterized in that, described method comprises step:
A, create point-to-point meeting, call out distance terminal;
B, treat the distance terminal call accepted after, and carry out the video/audio transfer of data between the distance terminal;
C, call out other distance terminal once more, the change conference type is a multipoint conference;
D, and an above distance terminal between carry out the video/audio transfer of data.
4. the multicast routing method of built-in multipoint control unit terminal according to claim 3 is characterized in that, the operation that described change conference type is a multipoint conference comprises: utilize more than one agreements to realize the video/audio transfer of data; Realize the processing of video/audio data more than a tunnel.
5. the multicast routing method of built-in multipoint control unit terminal according to claim 3, it is characterized in that, the operation of carrying out the video/audio transfer of data between described and above distance terminal comprises: described built-in multipoint control unit terminal receives after the video/audio data from each distance terminal, respectively the video/audio data of each distance terminal is carried out decoding processing; The collecting unit of described built-in multipoint control unit terminal collects after the video/audio data, require audio mixing with above-mentioned decoded video/audio data according to predetermined conference, corresponding then different distance terminals carry out encoding process respectively, with the coding after the video/audio transfer of data to each distance terminal.
6. the multicast routing method of built-in multipoint control unit terminal according to claim 3, it is characterized in that, further comprise behind the step D, if have distance terminal to withdraw from multipoint conference and this distance terminal is not last distance terminal of described multipoint conference, then stop to receive video/audio data from this distance terminal, and stop to send the video/audio data, and other distance terminal of notice multipoint conference toward this distance terminal; If last distance terminal that described built-in multipoint control unit terminal withdraws from multipoint conference or have distance terminal to withdraw from multipoint conference and this distance terminal is described multipoint conference then stops described multipoint conference, stop the video/audio transfer of data.
7. the Point-to-point Communication Method of the described built-in multipoint control unit terminal of claim 1 is characterized in that, described method includes step:
A, create point-to-point meeting, call out distance terminal or detect the calling of distance terminal;
B, treat the distance terminal call accepted or accept distance terminal to call out after, and carry out the video/audio transfer of data between the distance terminal.
8. the Point-to-point Communication Method of built-in multipoint control unit terminal according to claim 7 is characterized in that, the operation of the point-to-point meeting of described establishment comprises: initialization multipoint control unit, multipoint control unit are created point-to-point meeting.
9. the Point-to-point Communication Method of built-in multipoint control unit terminal according to claim 7, it is characterized in that, the operation of described calling distance terminal comprises: receive the distance terminal information of described built-in multipoint control unit terminal use input, send calling to this distance terminal.
10. the Point-to-point Communication Method of built-in multipoint control unit terminal according to claim 7, it is characterized in that, the operation of described video/audio transfer of data comprises: described built-in multipoint control unit terminal receives after the next video/audio data of distance terminal transmission, and described video/audio data are carried out decode operation; Or after the collecting unit of described built-in multipoint control unit terminal collects the video/audio data, the video/audio data that collected are encoded, the video/audio transfer of data after will encoding then is to distance terminal.
11. the Point-to-point Communication Method of built-in multipoint control unit terminal according to claim 7 is characterized in that, behind the step b, further comprises: described built-in multipoint control unit terminal or distance terminal stop meeting, stop the video/audio transfer of data.
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