CN100551029C - A kind of method of video conference terminal H.320 being carried out Long-distance Control - Google Patents
A kind of method of video conference terminal H.320 being carried out Long-distance Control Download PDFInfo
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Abstract
H.320 the method that video conference terminal is carried out Long-distance Control of the present invention comprises the remote control process that starts above-mentioned main control terminal and controlled terminal both sides; Between above-mentioned main control terminal and controlled terminal, set up the data channel that is used for Long-distance Control; And the communication on the above-mentioned data channel that is used for Long-distance Control of above-mentioned main control terminal and controlled terminal, finish Long-distance Control.Adopt the method for the invention that video conference terminal is H.320 carried out Long-distance Control, do not require that controlled terminal is equipped with computer network interface, has enlarged the range of application of Long-distance Control on terminal; H.320 the method for the invention adopts that the intrinsic circuit of video conference terminal carries out the information transmission, is convenient to realize Long-distance Control, can reduce the maintenance cost of terminal equipment.
Description
Technical field
The present invention relates to the digital multimedia communication field, relate in particular to a kind of method of video conference terminal H.320 being carried out Long-distance Control by video conferencing circuit H.320.
Background technology
Along with the development of information technology, video conferencing more and more scale by employing that industry-by-industry is supported, and corresponding with it be that the whole network network of video conferencing is also increasing, the maintenance cost of bringing thus is also more and more higher.
Traditional method that video conference terminal is carried out Long-distance Control has following three kinds:
Method one: for remote terminal is installed Simple Network Management Protocol (Simple NetworkManagement Protocol, be called for short SNMP) remote agent software, remote terminal is connected same Internet protocol (Internet Protocol, abbreviation IP) on the network, by network management center whole online terminals is carried out Long-distance Control at central site.
Method two: for remote terminal built-in web server (web server), land the page of remote terminal by browser, thereby reach control and management to remote terminal at central site.
Method three: be the software of the special exploitation of remote terminal based on TCP (Transmission Control Protocol/Internet Protocol) (hereinafter to be referred as TCP/IP) communication, be connected the TCP/IP control connection with remote terminal at central site, remote terminal carried out control and management by special-purpose software.
Generally speaking, more than three kinds of methods, no matter any, all requiring has available computer network interface between all controlled remote terminals and the central site, and under the application scenario of video conference terminal H.320, this requirement always can not be satisfied.Especially for the individual line subscriber that much can only just guarantee conference network, only built the special-purpose video conferencing net of 2M, and, just carried out Long-distance Control before this without any method for the Long-distance Control of this kind equipment.
Summary of the invention
In order to overcome prior art require when H.320 video conference terminal carries out Long-distance Control the to use a computer shortcoming of network interface, the objective of the invention is to propose a kind of use H.320 the video conferencing circuit video conference terminal is H.320 carried out the method for Long-distance Control.
For achieving the above object, a kind of method of video conference terminal H.320 being carried out Long-distance Control of the present invention, need to use at least two H.320 video conference terminals, for simplicity, the term " terminal " that subsequent section of the present invention occurs all refers to H.320 video conference terminal, and wherein one is to be in local main control terminal, and other are as the controlled terminal that is in far, and the number of this controlled terminal is not limit, and this method may further comprise the steps:
Step 1: start above-mentioned main control terminal and controlled terminal both sides' remote control process, even above-mentioned main control terminal and controlled terminal all enter the Long-distance Control state;
Step 2: between above-mentioned main control terminal and controlled terminal, set up the data channel that is used for Long-distance Control;
Step 3: the communication on the above-mentioned data channel that is used for Long-distance Control of above-mentioned main control terminal and controlled terminal, finish Long-distance Control.
Wherein, above-mentioned steps 1 may further comprise the steps:
Step 111: between above-mentioned main control terminal that participates in Long-distance Control and controlled terminal, set up data transmission channel;
Step 112: above-mentioned main control terminal sends a piece of news by above-mentioned data transmission channel to above-mentioned controlled terminal, it is the Long-distance Control initiation message, notify above-mentioned controlled terminal to start remote control process, thereby it is identical that the mechanism of the main control terminal control of the mechanism of the control of controlled terminal far and process and this locality and process are set to, and makes above-mentioned main control terminal and controlled terminal all enter the Long-distance Control state.
Above-mentioned steps 111 comprises:
1) between above-mentioned main control terminal and controlled terminal, only sets up a bidirectional data transfers channel; Or
2) between above-mentioned main control terminal and controlled terminal, set up outside the bidirectional data transfers channel, set up an one-way data transmission channel more separately.Wherein H.320 the remote signalling far away road in the video conferencing is exactly an one-way data transmission channel.
Above-mentioned bidirectional data transfers channel is meant that above-mentioned main control terminal and controlled terminal both sides can receive the data that the other side sends mutually at least one standard channel of video conferencing system H.320, wherein above-mentioned one-way data transmission channel and bidirectional data transfers channel all are meant logic function, might not have independent entity.And because above-mentioned bidirectional data transfers channel possesses the function that realizes the one-way data transmission simultaneously, so also can be so that carry out the one-way data transmission and needn't set up above-mentioned one-way data transmission channel separately with above-mentioned bidirectional data transfers channel.
Main control terminal in the above-mentioned steps 112 can adopt any feasible mode to send above-mentioned Long-distance Control initiation message to above-mentioned controlled terminal, for example comprises following mode:
1) message set of agreement is H.281 expanded to define a special Long-distance Control initiation message; Or
2) in the code stream of video channel, insert a special mark, do not use independent one-way data transmission channel this moment.
Wherein, above-mentioned steps 2 may further comprise the steps:
Step 211: open a data channel of agreement in advance in above-mentioned steps 1 on the bidirectional data transfers message basis that above-mentioned main control terminal and controlled terminal are set up jointly;
Step 212: set up a bi-directional logic channel on the basis of the data channel that above-mentioned main control terminal and controlled terminal are opened in above-mentioned steps 211, i.e. Long-distance Control channel is with control and the response message in the transmission remote control process.
Data channel in the above-mentioned steps 211 can be realized the entity of data double-way transparent transmission for the above-mentioned bidirectional data transfers channel of any use, it for example is the low speed data channel (Low Speed Data) (hereinafter to be referred as LSD) of the protocol architecture regulation of H.320 video conferencing, high speed data channels (High Speed Data, be called for short HSD), multi-layer protocol channel (Multi-layer-protocol, be called for short MLP) or high multi-layer protocol channel (HighMulti-layer-protocol, be called for short H-MLP) in a kind of, or above-mentioned main control terminal and controlled terminal stop to send video data and the video channel that frees out temporarily, or the part time slot in the above-mentioned channel or its combination.
The method of setting up above-mentioned Long-distance Control channel in above-mentioned steps 211 on the basis of the data channel that above-mentioned steps 212 is opened is arbitrarily, for example comprises:
1) will be one by one length fix but the variable successive bits string of content as the Long-distance Control channel;
2) with a series of continuous message bags that are combined into by the byte serial of different length and purposes as the Long-distance Control channel; Or
3) set up an ICP/IP protocol stack on the data channel of in above-mentioned steps 211, opening and with one of them transmission control protocol (Transmission Control Protocol, abbreviation TCP) port or User Datagram Protocol (User Datagram Protocol is called for short UDP) port is as the Long-distance Control channel.
Wherein, above-mentioned steps 3 may further comprise the steps:
Step 311: above-mentioned main control terminal sends control information to above-mentioned controlled terminal by above-mentioned Long-distance Control channel;
Step 312: above-mentioned controlled terminal receives above-mentioned control information and is carried out on above-mentioned Long-distance Control channel;
Step 313: above-mentioned controlled terminal sends response message by above-mentioned Long-distance Control channel to above-mentioned main control terminal;
Step 314: judge whether this remote control process finishes, then above-mentioned if not main control terminal and controlled terminal repeat above-mentioned steps 311 to step 313, finish up to this remote control process; If then finish this remote control process; The transmission of wherein above-mentioned control information and response message needn't be followed strict sequential relationship, can correctly understand each bar information as long as guarantee main control terminal and controlled terminal both sides.
The essence of the method for the invention is that control and response message are transmitted between main control terminal and controlled terminal by video conferencing circuit H.320, adopt the method for the invention that video conference terminal is H.320 carried out Long-distance Control, do not require that controlled terminal is equipped with computer network interface, has enlarged the range of application of Long-distance Control on terminal; H.320 the method for the invention adopts that the intrinsic circuit of video conference terminal carries out the information transmission, is convenient to realize Long-distance Control, can reduce the maintenance cost of terminal equipment.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperation Figure of description are described in detail below.
Description of drawings
Fig. 1 is an application model schematic diagram of the present invention.
Fig. 2 is the overview flow chart of long-range control method of the present invention.
Fig. 3 is the flow chart of step 111 in the present invention's one specific embodiment.
Fig. 4 is that the present invention also responds the flow chart that finishes from setting up the Long-distance Control channel up to the Long-distance Control information and executing.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is an application model schematic diagram of the present invention.As shown in Figure 1, " terminal " among the figure refers to H.320 video conference terminal, corresponding therewith, " link " and " network " among the figure refer to H.320 video conferencing link and H.320 video conference networks respectively, and both form H.320 video conferencing circuit jointly wherein above-mentioned " link " and " network ".Two station terminals pass through the link access network respectively, thereby realize data passes and information exchange end to end, thereby the present invention realizes Long-distance Control in the band of strange land terminal by the connection control to the local terminal.
Fig. 2 is the flow chart of long-range control method of the present invention.As shown in Figure 2, the method for the invention mainly comprises following step:
Step 201: beginning;
Step 202: connect the local terminal with special-purpose software and local control system; Wherein above-mentioned special-purpose software can obtain by developing separately, or the acquisition of making amendment on the basis of local Control Software;
Step 203: between two terminals, set up unidirectional and the bidirectional data transfers channel;
Step 204: send the Long-distance Control initiation message;
Step 205: the bi-directional data channel of opening two terminal rooms;
Step 206: set up the Long-distance Control logic channel;
Step 207: utilize local Control Software to send control information to remote terminal by the local terminal;
Step 208: remote terminal is carried out control information;
Step 209: remote terminal sends response message to local terminal and Control Software;
Step 210: repeat above-mentioned steps 207 to step 209, finish up to this control;
Step 211: send the Long-distance Control termination messages by the local terminal, finish.
Enumerate a specific embodiment below, illustrate that terminal is by the order of the method for the invention order far-end execution input video parameter regulation.
When stating step 111 on the implementation, terminal as the one-way data transmission, is used as bidirectional data transfers with video channel with the LSD channel.Fig. 3 is the flow chart of step 111 in the present invention's one specific embodiment.As shown in Figure 3, it mainly comprises following step:
Step 301: beginning;
Step 302: make two station terminals that need to participate in Long-distance Control (one of them terminal might as well be called terminal A, correspondingly the another one terminal is called terminal B) enter the H.320 meeting of same new beginning, wherein this two station terminal must have by the LSD channel transfer ability of message H.281, if what this two station terminal entered is a multipoint conference, then require multipoint control unit (Multipoint Controller Unit) (hereinafter to be referred as MCU) also to have corresponding ability;
Step 303: the type of judging active conference, if active conference is point-to-point meeting, then two terminals can be opened the LSD channel and send data to the other side at this moment, and two terminals can both receive the other side's data mutually on video channel, wherein see the other side's image mutually, can abbreviate " image is seen mutually " as, so unidirectional and bidirectional data transfers mechanism realizes that all then execution in step 308; If active conference is a multipoint conference, then execution in step 304;
Step 304: terminal A sends CCA message, and request Chair token, MCU respond this request, give terminal chairman A token;
Step 305: terminal A sends a VCB message, and the parameter of this message is M/T number of terminal A, and MCU responds this message, gives all other terminals in the meeting with the broadcast of images of terminal A, and terminal B has just seen the image of terminal A like this;
Step 306: terminal A sends a VCS message, the requested image choosing is seen, the parameter of this message is M/T number of terminal B, MCU responds this message, the image of terminal B is sent to terminal A, so far two station terminal A under the multipoint conference condition and B have realized that image sees that mutually bidirectional data transfers mechanism is implemented;
Step 307: terminal A sends DCA-L message application LSD token, MCU responds this request, give the such terminal A of terminal A with the LSD token and just had the power that sends data on the LSD channel to terminal B in multipoint conference, so far the one-way data transmission mechanism also is implemented;
Step 308: finish.
Terminal A sends the Long-distance Control initiation message by the LSD channel subsequently, and this message is actually the H.281 message of an expansion, specifically belongs to action (Action) message wherein.Table 1 has provided the structure of Long-distance Control initiation message:
Table 1
| In proper order | Length (byte) | Implication |
| 1 | 1 | Action code is fixed as 0x09 |
| 2 | 4 | Device type is fixed as 0x00010001 at present |
Wherein, the first in the table 1 is the action code of 1 byte, and H.281 agreement has been used 0x01-0x07, and present embodiment is made as 0x09 with it, and terminal B just can isolate the Long-distance Control initiation message by the action code of 0x09 like this;
Second portion in the table 1 is with the device type of the controlled terminal of four byte representations expectation, for simplicity, it is the terminal of same kind that present embodiment requires main control terminal and controlled terminal, and whether the device type that controlled terminal can be judged self is identical with the device type of this part representative and take different processing.
Terminal A (B) is after sending (reception) Long-distance Control initiation message, stop at and send video data on the video channel, in remote control process subsequently, terminal is directly used the video channel of free time as the data channel that is used for Long-distance Control, set up the Long-distance Control channel thereon.
In the present embodiment, the Long-distance Control channel is made up of the message bag, and each message Bao Ze is made up of several bytes.Message wraps on the video channel to be transmitted, the content of same message bag is transmission continuously in order, first byte of the message bag in back follows hard on last byte transmission of previous message bag, terminal A and B all to self up video channel transmission packet and receive the message bag from descending video channel, thereby set up the Long-distance Control channel.
Table 2 has provided the form of the message bag of forming above-mentioned Long-distance Control channel:
Table 2
| In proper order | Field name | Length (byte) | Implication |
| 1 | Stem | 4 | As beginning flag, content is always 0x12 0x56 0x34 0x78 |
| 2 | Length | 4 | All fields of this message total who comprises stem |
| Length (byte) | |||
| 3 | Sequence number | 4 | Initial value is zero, and every transmission a piece of news then sequence number adds 1 |
| 4 | Code | 4 | The type that shows this message |
| 5 | Parameter | Indefinite | Difference with code field changes, and length deducts 18 for the message total length |
Wherein, the first in the table 2 is the fixing stem of content of 4 bytes, as the beginning flag of message bag;
Second portion in the table 2 is the length of 4 bytes, provides the total length of certain message bag;
Third part in the table 2 is the sequence number of 4 bytes, whether has judged whether information drop-out continuously by the inspection sequence number when terminal receives message;
The 4th part in the table 2 is the code of 4 bytes, provides the type of this message bag;
The 5th part in the table 2 is adjustable length message parameter, dissimilar message bags, and the length of its parameter is all different with implication.
Table 3 has provided the span and the implication of above-mentioned message code:
Table 3
| Message code | Type of message | Parameter length | Meaning of parameters |
| 1 | In the connection | 0 | Do not have |
| 2 | Connect | 0 | Do not have |
| 3 | Fill | Indefinite | Meaningless |
| 4 | Control | Indefinite | Control information and information |
Wherein, " in the connection " in the table 3 and " being connected " message are used in that correct the localization message bag---this process can become synchronously by the byte stream of video channel transmission;
" filling " message in the table 3 is used to keep the synchronous of message sink;
" control " message in the table 3 is used for control information and the response message transmitted between two terminals.
Fig. 4 is that terminal also responds the action flow chart that finishes from setting up the Long-distance Control channel up to the Long-distance Control information and executing.Below in conjunction with Fig. 4 the usage of above-mentioned message is described in detail.As shown in Figure 4, it may further comprise the steps:
Step 401: beginning sends and receives the message bag on video channel;
Step 402 to step 405 is the process that main control terminal and controlled terminal both sides shake hands at the enterprising row communication of Long-distance Control channel, at first step 402: the message bag type that main control terminal is provided with transmission is " in the connection ";
Step 403: controlled terminal is isolated one by one message in the mode of searching message header from byte stream, and obtains the type of message according to the message format of definition in the above-mentioned table 2; In order to prevent erroneous judgement, controlled terminal must be continuous receives " in the connection " or " connecting " message five times just can change execution in step 404 over to, otherwise repeated execution of steps 403, obviously, this step comes down to the video data that receives is received synchronous process according to the form of message bag;
Step 404: the Izvestia type that controlled terminal is provided with transmission is " connecting ";
Step 405: in order to guarantee that main control terminal also can receive enough " in the connection " or " connecting " message is synchronous to the reception of message bag to realize, " connecting " message will send five times at least; If main control terminal has sent at least five " connecting " message and has also received at least five " connecting " message that controlled terminal sends, mean that then main control terminal and controlled terminal all realized receiving synchronously, think this moment and shake hands successfully execution in step 406, otherwise repeating step 405;
Step 406: judge whether local terminal is the transmitting terminal of software code, judge promptly whether local terminal is main control terminal, if execution in step 407 then, otherwise carry out 411;
Step 407: main control terminal sends " control " message, and concrete contents such as control command for example can will be used for the command messages string of local control as parameter as the parameter of this message;
Step 408: main control terminal is provided with and sends type of message is " filling "; Because the employed video channel of Long-distance Control channel is a channel that bandwidth is constant, it requires the message bag to send incessantly, otherwise it is synchronous that controlled terminal will lose the reception of message bag, therefore main control terminal must not send " filling " message when having other kind of message to send, synchronous with the reception of keeping controlled terminal, the parameter of this message is meaningless, and length is as the criterion to realize the purpose of filling;
Step 409: judge whether main control terminal receives " control " message of controlled terminal, if execution in step 410 then, otherwise repeated execution of steps 409;
Step 410: handle " control " message that controlled terminal is sent;
Step 411: controlled terminal is provided with and sends type of message is " filling ", and its purpose is identical with step 408;
Step 412: judge whether controlled terminal receives " control " message of main control terminal, if then carry out 410, otherwise repeated execution of steps 412;
Step 413: controlled terminal is handled " control " message that receives, and takes out content of parameter and is analyzed execution;
Step 414: controlled terminal, generates " control " message and sends to main control terminal as parameter with the execution result of step 413, in fact, is will be used for the response message string of local control as parameter here;
Step 415: judge whether remote control process finishes, if execution in step 416 then, otherwise execution in step 406;
Step 416: finish.
More than describe operation principle of the present invention in detail, but the example of this visualization of just lifting for the ease of understanding should not be considered to be limitation of the scope of the invention.Equally, according to the description of technical scheme of the present invention and preferred embodiment thereof, can make various possible being equal to and change or replacement, and all these changes or replacement all should belong to the protection range of claim of the present invention.
Claims (9)
1, a kind of method of video conference terminal H.320 being carried out Long-distance Control, it is characterized in that needs use at least two H.320 video conference terminals, wherein one is to be in local main control terminal, other are as the controlled terminal that is in far, and the number of this controlled terminal is not limit, and this method may further comprise the steps:
Step 1: start above-mentioned main control terminal and controlled terminal both sides' remote control process, even above-mentioned main control terminal and controlled terminal all enter the Long-distance Control state;
Step 2: between above-mentioned main control terminal and controlled terminal, set up the data channel that is used for Long-distance Control;
Step 3: the communication on the above-mentioned data channel that is used for Long-distance Control of above-mentioned main control terminal and controlled terminal, finish Long-distance Control.
2, method according to claim 1 is characterized in that above-mentioned steps 1 may further comprise the steps:
Step 111: between above-mentioned main control terminal that participates in Long-distance Control and controlled terminal, set up data transmission channel;
Step 112: above-mentioned main control terminal sends a piece of news by above-mentioned data transmission channel to above-mentioned controlled terminal, and promptly the Long-distance Control initiation message notifies above-mentioned controlled terminal to start remote control process, enters the Long-distance Control state.
3, method according to claim 2 is characterized in that above-mentioned steps 111 comprises:
1) between above-mentioned main control terminal and controlled terminal, only sets up a bidirectional data transfers channel; Or
2) between above-mentioned main control terminal and controlled terminal, set up outside the bidirectional data transfers channel, set up an one-way data transmission channel more separately.
4, method according to claim 3 is characterized in that above-mentioned bidirectional data transfers channel is meant that above-mentioned main control terminal and controlled terminal both sides can receive the data that the other side sends mutually at least one standard channel of video conferencing system H.320.
5, method according to claim 2 is characterized in that the main control terminal in the above-mentioned steps 112 comprises to the mode that above-mentioned controlled terminal sends above-mentioned Long-distance Control initiation message:
1) message set of agreement is H.281 expanded to define a special Long-distance Control initiation message; Or
2) in the code stream of video channel, insert a special mark.
6, method according to claim 1 is characterized in that above-mentioned steps 2 may further comprise the steps:
Step 211: open a data channel of agreement in advance in above-mentioned steps 1 on the bidirectional data transfers message basis that above-mentioned main control terminal and controlled terminal are set up jointly;
Step 212: set up a bi-directional logic channel on the basis of the data channel that above-mentioned main control terminal and controlled terminal are opened in above-mentioned steps 211, i.e. Long-distance Control channel is with control and the response message in the transmission remote control process.
7, method according to claim 6, it is characterized in that a kind of in low speed data channel, high speed data channels, multi-layer protocol channel or the high multi-layer protocol channel of the protocol architecture regulation of video conferencing H.320 of data channel in the above-mentioned steps 211, or above-mentioned main control terminal and controlled terminal stop to send video data and the video channel that frees out temporarily, or the part time slot in the above-mentioned channel or its combination.
8, method according to claim 6 is characterized in that the method for setting up above-mentioned Long-distance Control channel in above-mentioned steps 211 on the basis of the data channel that above-mentioned steps 212 is opened comprises:
1) will be one by one length fix but the variable successive bits string of content as the Long-distance Control channel;
2) with a series of continuous message bags that are combined into by the byte serial of different length and purposes as the Long-distance Control channel; Or
3) set up a TCP protocol stack on the data channel of in above-mentioned steps 211, opening and with one of them transmission control protocol port or User Datagram Protocol port as the Long-distance Control channel.
9, method according to claim 1 is characterized in that above-mentioned steps 3 may further comprise the steps:
Step 311: above-mentioned main control terminal sends control information to above-mentioned controlled terminal by above-mentioned Long-distance Control channel;
Step 312: above-mentioned controlled terminal receives above-mentioned control information and is carried out on above-mentioned Long-distance Control channel;
Step 313: above-mentioned controlled terminal sends response message by above-mentioned Long-distance Control channel to above-mentioned main control terminal;
Step 314: judge whether this remote control process finishes, then above-mentioned if not main control terminal and controlled terminal repeat above-mentioned steps 311 to step 313, finish up to this remote control process; If then finish this remote control process; The transmission of wherein above-mentioned control information and response message needn't be followed strict sequential relationship, can correctly understand each bar information as long as guarantee main control terminal and controlled terminal both sides.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2005/001072 WO2007009293A1 (en) | 2005-07-19 | 2005-07-19 | Method for remote controlling the h.320 video conference terminal |
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| CN101142819A CN101142819A (en) | 2008-03-12 |
| CN100551029C true CN100551029C (en) | 2009-10-14 |
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| CN101674451B (en) | 2009-09-27 | 2012-05-09 | 中兴通讯股份有限公司 | Method, system, central control subsystem and video terminal for controlling multipoint videoconference |
| CN103781171A (en) | 2012-10-24 | 2014-05-07 | 中兴通讯股份有限公司 | Terminal and synchronization control method thereof |
| CN112738450B (en) * | 2021-01-19 | 2023-05-02 | 北京融讯科创技术有限公司 | Conference holding method, device, equipment and computer readable storage medium |
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| CN1266939C (en) * | 2003-04-23 | 2006-07-26 | 中兴通讯股份有限公司 | Method for implementing multiplexing video communication in video conference system |
| CN100391256C (en) * | 2003-08-11 | 2008-05-28 | 英业达股份有限公司 | System and method for switching communication on-line for video conference |
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