CN101488916A - Band-width control method, apparatus, terminal and system based on video conference - Google Patents
Band-width control method, apparatus, terminal and system based on video conference Download PDFInfo
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Abstract
The embodiment of the invention provides a bandwidth controlling method, device, terminal and system based on videoconference; the method comprises the steps that: the conference control apparatus respectively establishes call connection with the circuit network terminal and packet switched network terminal; the conference control apparatus ensures that the packet switched network bandwidth does not satisfy the packet switched network video data transmission request and notifies the circuit network terminal to execute code stream controlling, thereby reducing the circuit network video data transmission speed. The technical proposal provided by the embodiment of the invention, when judging that the packet switched network bandwidth does not satisfy the packet switched network video data transmission request, notifies the circuit network terminal to execute code stream controlling, which solves the problem of losing packet in videoconference mixed by circuit network terminal and packet switched network, and stably reduces the speed in the videoconference mixed by circuit network terminal and packet switched network and strengthens the network suitability and improves the ease of use of mixed networking.
Description
Technical field
The present invention relates to video conferencing technology, relate in particular to the Bandwidth Control in the video conference, is a kind of band width control method based on video conference, device, terminal and system specifically.
Background technology
Video conferencing system can be applicable to circuit-switched network or packet network, but has a lot of problems, the situation that for example exists packet loss and bandwidth to ensure when above-mentioned two kinds of mixture of networks are used.H.320 the video conferencing system universal standard based on circuit network is, H.320 standard comprises series of standards for its service, and H.221/H.242/H.239 example waits; H.323 the video conferencing system universal standard based on packet network is, H.323 standard comprises series of standards for its service, and H.245/Q.931/H.239 example waits.
H.320 with H.323 mix when using, system need dispose H.320 or H.323 the gateway support mix and use, the effect of gateway be exactly conversion H.320 and signaling H.323 and medium packing manner.
As shown in Figure 1, mix in the video conferencing system of using multipoint control unit (MCU:Multipoint Control Unit) at circuit network and IP network and be connected with terminal H.320, and be connected with terminal H.323 by IP network by circuit network (SDH:Synchronous DigitalHierarchy or ISDN:Integrated Services Digital Network).Wherein as MCU and when H.323 the bandwidth between the terminal can not reach the demand bandwidth, need terminal reduction of speed H.323 to be handled by the flow-control command in the agreement H.245, but because MCU and H.320 the bandwidth between the terminal be secure, so agreement does not support to connect the code stream reduction of speed after the foundation, when terminal reduction of speed H.323, H.320 the terminal transmitted stream surpasses the code stream that terminal H.323 can be accepted, and causing H.323, terminal produces image flower screen because of the code stream packet loss.
In order to address the above problem, the prior art H.320 code stream of gateway is issued H.323 terminal again through after the adaptation processing, ensures H.323 normally receiving media code stream of terminal, makes H.323 terminal can not spend screen.In realizing process of the present invention, the inventor finds that this solution of carrying out code stream conversion (transcoding) in adaptive mode has consumed more cpu resource, has increased cost, and has caused the image effect variation.
In order to address the above problem, prior art also realizes the reduction of speed processing of ISDN meeting-place by the B channel mode of hanging up ISDN.In realizing process of the present invention, the inventor finds that this scheme only is applicable to the terminal that integrated services digital network (ISDN:Integrated Service Digital Network) inserts, terminal for access via telephone line is inapplicable, the bandwidth that uncontrollable E1 inserts.
Summary of the invention
In order to overcome defective of the prior art, the embodiment of the invention proposes a kind of band width control method and device based on video conference, uses the problem of the packet loss when making with to solve circuit-switched network and packet network in meeting.
One of purpose of the present invention is, a kind of band width control method based on video conference is provided, and described method may further comprise the steps:
Conference control equipment is set up to call out with circuit network terminal and packet network terminal respectively and is connected;
Described conference control equipment determines that described packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, then notifies described circuit network terminal to carry out code stream control, to reduce circuit network video Data Transmission speed.
One of purpose of the present invention is, a kind of band width control method based on video conference is provided, and described method may further comprise the steps:
The circuit network terminal is connected with the calling of packet network terminal response conference control equipment, and foundation is connected with the calling of conference control equipment respectively;
The circuit network terminal receives conference control equipment transmitted stream control notice;
Described circuit network terminal carries out code stream control according to described code stream control notice, to reduce video Data Transmission speed.
One of purpose of the present invention is, a kind of bandwidth control apparatus based on video conference is provided, and described device comprises:
The call setup unit is used for conference control equipment and is connected with circuit network terminal and packet network terminal foundation calling respectively;
Code stream control notification unit is used for described conference control equipment and determines that described packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, then notifies described circuit network terminal to carry out code stream control.
One of purpose of the present invention is, a kind of bandwidth control terminal based on video conference is provided, and described described terminal comprises:
Call out connection response and set up the unit, the calling that is used for the response session control appliance connects;
Code stream control notice receiving element is used to receive conference control equipment transmitted stream control notice;
The code stream control unit is used for carrying out code stream control according to described code stream control notice, to reduce video Data Transmission speed.
One of purpose of the present invention is, a kind of bandwidth control system based on video conference is provided, described described system comprises: conference control equipment, circuit network terminal and IP network terminal, described conference control equipment is connected with described circuit network terminal by circuit network, and is connected with described IP network terminal by IP network;
Described conference control equipment comprises the call setup unit, is used to set up with the calling of circuit network terminal with the IP network terminal be connected; Code stream control notification unit is used for described conference control equipment and determines that described IP network bandwidth does not satisfy the requirement of IP network video Data Transmission, then notifies described circuit network terminal to carry out code stream control;
Described circuit network terminal comprises: call out connection response and set up the unit, the calling that is used for the response session control appliance connects; Code stream control notice receiving element is used to receive conference control equipment transmitted stream control notice; The code stream control unit is used for carrying out code stream control according to described code stream control notice, to reduce video Data Transmission speed.
The beneficial effect of the embodiment of the invention is, by judging when the packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, notify described circuit network terminal to carry out code stream control, solved the problem of packet loss in the video conference that circuit-switched network and packet network are used with, realized the stable reduction of speed in the video conference that circuit-switched network and packet network are used with, strengthen network-adaptive, improved the ease for use of mixed networking.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
H.320, Fig. 1 uses networking diagram with H.323 mixing in the video conferencing system;
The flow chart that Fig. 2 provides for the embodiment of the invention based on the band width control method of video conference;
The code stream figure before filling fec frame that Fig. 3 provides for the embodiment of the invention;
The flow chart that Fig. 4 provides for the embodiment of the invention based on the band width control method of video conference;
The flow chart that Fig. 5 provides for the embodiment of the invention based on the band width control method of video conference;
The code stream figure after filling fec frame that Fig. 6 provides for the embodiment of the invention;
The MBE information order table that provides of inventive embodiments is provided Fig. 7;
The flow chart that Fig. 8 provides for the embodiment of the invention based on the band width control method of video conference;
Time slot table behind the change time slot that Fig. 9 provides for the embodiment of the invention that provides of the embodiment of the invention;
The flow chart that Figure 10 provides for the embodiment of the invention based on the band width control method of video conference;
The passage precedence diagram that Figure 11 provides for the embodiment of the invention;
The structured flowchart that Figure 12 A provides for the embodiment of the invention based on the bandwidth control apparatus of video conference;
The structured flowchart that Figure 12 B provides for the embodiment of the invention based on the bandwidth control apparatus of video conference;
The structured flowchart that Figure 12 C provides for the embodiment of the invention based on the bandwidth control apparatus of video conference;
The structured flowchart that Figure 13 A provides for the embodiment of the invention based on the bandwidth control terminal of video conference;
The structured flowchart that Figure 13 B provides for the embodiment of the invention based on the bandwidth control terminal of video conference;
The structured flowchart that Figure 13 C provides for the embodiment of the invention based on the code stream control unit of the bandwidth control terminal of video conference;
The structured flowchart that Figure 13 D provides for the embodiment of the invention based on the code stream control unit of the bandwidth control terminal of video conference;
The system construction drawing that Figure 14 controls for the bandwidth based on video conference that the embodiment of the invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment one
As shown in Figure 2, the band width control method based on video conference of the embodiment of the invention may further comprise the steps: conference control equipment is set up to call out with circuit network terminal and packet network terminal respectively and is connected (step S201); Described conference control equipment determines that described packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, then notifies described circuit network terminal to carry out code stream control, to reduce circuit network video Data Transmission speed (step S202).
In embodiments of the present invention, be example with MCU as the meeting control device, but the conference control equipment of the embodiment of the invention comprise and is not limited to MCU that the conference control equipment that any and MCU have identical or identity function all can be used to substitute MCU.The circuit network terminal includes but not limited to H.320 terminal, can also be ISDN terminal, the PSTN terminal, and the packet network terminal includes but not limited to H.323 terminal, can also be sip terminal.
The beneficial effect of the embodiment of the invention is, by determining not satisfy the requirement of packet network video Data Transmission in the packet network bandwidth, notify described circuit network terminal to carry out code stream control, realized the stable reduction of speed in the video conference that circuit-switched network and packet network are used with, strengthen network-adaptive, improved the ease for use of mixed networking.
Embodiment two
As shown in Figure 3, the band width control method based on video conference of the embodiment of the invention may further comprise the steps: the circuit network terminal is connected with the calling of packet network terminal response conference control equipment, and foundation is connected (step S301) with the calling of conference control equipment respectively; The circuit network terminal receives conference control equipment transmitted stream control notice (step S302); Described circuit network terminal carries out code stream control according to described code stream control notice, to reduce video Data Transmission speed (step S303).
In embodiments of the present invention, be example with MCU as conference control equipment, but the conference control equipment of the embodiment of the invention comprise and is not limited to MCU that the conference control equipment that any and MCU have identical or identity function all can be used to substitute MCU.The circuit network terminal includes but not limited to H.320 terminal, can also be ISDN terminal, the PSTN terminal, and the packet network terminal includes but not limited to H.323 terminal, can also be sip terminal.
The beneficial effect of the embodiment of the invention is, when the packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, notify described circuit network terminal to carry out code stream control, realized the stable reduction of speed in the video conference that circuit-switched network and packet network are used with, strengthen network-adaptive, improved the ease for use of mixed networking.
Embodiment three
The embodiment of the invention provides a kind of band width control method based on video conference.In the embodiment of the invention, be example as conference control equipment, but the conference control equipment of the embodiment of the invention comprise and is not limited to MCU that the conference control equipment that any and MCU have identical or identity function all can be used to substitute MCU with MCU.The circuit network terminal includes but not limited to H.320 terminal, can also be ISDN terminal, the PSTN terminal, and the packet network terminal includes but not limited to H.323 terminal, can also be sip terminal.
On the basis of embodiment two, after the circuit network terminal received conference control equipment transmitted stream control notice, it was to realize in the mode of filling the invalid video Frame that the circuit network terminal carries out code stream control.
H.320 the code stream of terminal before carrying out coded video bit stream as shown in Figure 4, wherein A represents audio frequency (Audio); V represents video (Video); F represents frame alignment word (FAS:Frame AlignmentSignal); B bit stream assignment signalling (Bit-rate Alignment Signal).If channel width is 128K, and audio frequency takies 48K, and video takies the channel width except that FAS, BAS and Audio.Behind call setup, H221 time slot table is fixing, and it is fixing promptly to look audio bandwidth, if when the actual audio code stream can not satisfy the 48K bandwidth, needs to replenish quiet code stream; When if the actual video code stream can not satisfy respective bandwidth, then need to fill the invalid video Frame, for example forward error correction (FEC:Forward Error Correction) infilled frame.
As shown in Figure 5, the band width control method based on video conference of the embodiment of the invention may further comprise the steps: MCU convenes and contains H.323 terminal and the H.320 meeting of terminal, promptly MCU respectively with terminal H.323, terminal connect (step S501) H.320; H.323 terminal detects Network Packet Loss, to MCU feedback packet loss, perhaps sends Flow Control message to MCU, also can realize (step S502) according to user's needs oneself; MCU is according to the packet loss or the Flow Control bandwidth calculation network bandwidth, sends Flow Control message (step S503) to terminal H.323 simultaneously; H.323 terminal sends code stream according to the Flow Control bandwidth of MCU, realizes H.323 terminal reduction of speed (step S504); H.323 behind the terminal reduction of speed, MCU sends flow-control command (step S505) to terminal H.320; H.320 after terminal is received flow-control command, carry out code stream control (step S506) in the mode of filling the invalid video code stream; Simultaneously the MCU side begins to detect from video data frame (step S507) in the video code flow of terminal H.320; When transmitting code stream, video data frame is removed, to reach the video code flow bandwidth (step S508) that terminal H.323 can receive.
Realized steady reduction of speed by above step.
According to above-mentioned steps S506, the code stream figure behind the filling video infilled frame (fec frame) as shown in Figure 6.Wherein A represents: audio frequency (audio); V represents: video (video); F represents: frame alignment word (FAS:Frame Alignment Signal); B represents: bit stream assignment signalling (Bit-rate Alignment Signal); D represents: video data frame.
After the above-mentioned steps S508 end, if MCU and the H.323 improvement of the network between the terminal for example detect less than packet loss in continuous a period of time behind the reduction of speed, the MCU transmitting control commands, the Flow Control of cancellation forwarding code stream limits and realizes the raising speed processing.Described control command by expansion MBE (multibyte expansion) message realization form be Start_MBE}/N/＜x 〉/(N-1) bytes.Wherein { Start_MBE} is MBE; The MBE message identifier, N is the MBE message-length,＜x〉be the MBE information order, can use 0xCF, the information order that MBE reserves.As shown in Figure 7, be the MBE information order table that provides of inventive embodiments.N in Fig. 7: be fixed as 4 at present, can change during other parameters of subsequent expansion; Media channel sign: 1 video main flow, the auxilliary stream of 2 videos; The target bandwidth: with K is unit; Example: 768K fills out 0300 (16 system).
Realize stable reduction of speed in the video conference that switching network uses with by above step, further, after network takes a turn for the better, realized the raising speed processing.
The embodiment of the invention is carried out code stream control by use the infilled frame mode in the video conference that circuit-switched network and packet network are used with, solved the problem of packet loss in the video conference, realized the stable reduction of speed in the video conference that circuit-switched network and packet network are used with, strengthen network-adaptive, improved the ease for use of mixed networking.
Embodiment four
The embodiment of the invention provides a kind of band width control method based on video conference.In the embodiment of the invention, be example as conference control equipment, but the conference control equipment of the embodiment of the invention comprise and is not limited to MCU that the conference control equipment that any and MCU have identical or identity function all can be used to substitute MCU with MCU.The circuit network terminal includes but not limited to H.320 terminal, can also be ISDN terminal, the PSTN terminal, and the packet network terminal includes but not limited to H.323 terminal, can also be sip terminal.
On the basis of embodiment two, after the circuit network terminal received conference control equipment transmitted stream control notice, it was to realize in the mode of changing the time slot table that the circuit network terminal carries out code stream control.
As shown in Figure 8, the band width control method based on video conference of the embodiment of the invention may further comprise the steps: MCU convenes and contains H.323 terminal and the H.320 meeting of terminal (step S801); H.323 terminal detects Network Packet Loss, to MCU feedback packet loss, perhaps sends Flow Control message to MCU, perhaps can realize according to user's needs oneself) (step S802); MCU according to packet loss or Flow Control bandwidth calculation current network bandwidth as, send Flow Control message (step S803) to terminal H.323 simultaneously; H.323 terminal sends code stream according to the Flow Control bandwidth of MCU, realizes H.323 terminal reduction of speed (step S804); H.323 behind the terminal reduction of speed, MCU sends flow-control command (step S805) to terminal H.320; H.320 after terminal is received flow-control command, the video sub-slots (step S806) that MCU reduces according to Flow Control bandwidth calculation needs; H.320 terminal is then according to Flow Control bandwidth encode (step S807); H.320 terminal is upgraded the time slot table (step S808) of local terminal simultaneously.As Fig. 9 black partly is exactly the sub-slots that reduces, and when transmitted image, can not use the sub-slots of these two black.
MCU need to upgrade the H.320 time slot table of terminal of local terminal correspondence, otherwise video code flow can not be resolved normally after H.320 terminal sends flow-control command; After MCU upgrades local terminal time slot table, need send the request of I frame, avoid because the change of time slot table causes image flower screen to terminal B.
The terminal that present embodiment provides is by judging when the packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, notify described circuit network terminal to carry out code stream control, solved the problem of packet loss in the video conference that circuit-switched network and packet network are used with, realized the stable reduction of speed in the video conference that circuit-switched network and packet network are used with, strengthen network-adaptive, improved the ease for use of mixed networking.
Embodiment five
The embodiment of the invention provides a kind of band width control method based on video conference.In the embodiment of the invention, be example as conference control equipment, but the conference control equipment of the embodiment of the invention comprise and is not limited to MCU that the conference control equipment that any and MCU have identical or identity function all can be used to substitute MCU with MCU.The circuit network terminal includes but not limited to H.320 terminal, can also be ISDN terminal, the PSTN terminal, and the packet network terminal includes but not limited to H.323 terminal, can also be sip terminal.
On the basis of embodiment two, after the circuit network terminal received conference control equipment transmitted stream control notice, it was that mode with active channel realizes that the circuit network terminal carries out code stream control.
The H221 frame can be made up of multiple channel mode, passage order as shown in figure 10, various passages can be selected to use according to user's practical application.The passage of present embodiment is auxilliary circulation road.
Auxilliary circulation road control protocol is as follows:
AMC-open<AMCOpenByte1><AMCOpenByte2>
＜AMCOpenByte1 〉: describe auxilliary stream and used role and channel number
＜AMCOpenByte2 〉: having described auxilliary circulation road bandwidth, is unit with 8K (sub-slots)
AMC-close<AMCCloseByte1>
＜AMCCloseByte1 〉: auxilliary circulation road label has been described
Auxilliary circulation road is supported dynamic opening and is closed in agreement, can reach the purpose of reduction of speed by this protocol application.
The flow chart of the mixing meeting broadband control method that provides of the embodiment of the invention is provided as shown in figure 11; The MCU control desk passes through MCU and convenes and contain H.323 terminal and the H.320 meeting of terminal (step S1101); H.323 terminal detects Network Packet Loss, to MCU feedback packet loss, perhaps sends Flow Control message to MCU, perhaps can realize (step S1102) according to user's needs oneself; MCU is according to packet loss or Flow Control bandwidth calculation current network bandwidth such as 768K, sends Flow Control message (step S1103) to terminal H.323 simultaneously; H.323 terminal sends code stream according to the Flow Control bandwidth of MCU, realizes H.323 terminal reduction of speed (step S1104); H.323 behind the terminal reduction of speed, MCU calculates the timeslot number (step S1105) that terminal H.320 needs reduction of speed; MCU sends auxilliary circulation road to terminal H.320 and opens control command (step S1106); H.320 after terminal receives that auxilliary circulation road is opened order, according to Flow Control bandwidth encode (step S1107); H.320 terminal needs to change the time slot table of local terminal simultaneously, increases the time slot (step S1108) of auxilliary stream in the time slot table; MCU needs to upgrade the time slot table of local terminal after H.320 the auxilliary circulation road of terminal transmission is opened, the time slot of the auxilliary stream of increase is finished reduction of speed (step S1109) in the same time slot table.Preferably, above-mentioned steps also comprises: if detect behind the reduction of speed less than packet loss, then limit by the Flow Control of cancelling the forwarding code stream and realize the raising speed processing.
Because auxilliary circulation road just is used for the main flow reduction of speed in the present embodiment, the data in the therefore auxilliary circulation road only need be given tacit consent to filling, do not need to resolve.The foregoing description is the example explanation with auxilliary circulation road just, in like manner is suitable for but present embodiment is not limited to the passage that auxilliary circulation road takies other.
The technique effect that the embodiment of the invention can reach is: by change the time slot table in the mode of active channel in the video conference that circuit-switched network and packet network are used with, solved the problem of packet loss in video conference, realized the stable reduction of speed in the video conference that circuit-switched network and packet network are used with, strengthen network-adaptive, improved the ease for use of mixed networking.
Embodiment six
Shown in Figure 12 A, the bandwidth control apparatus 1200 based on video conference of the embodiment of the invention comprises: call setup unit 1201, code stream control notification unit 1202.Wherein, call setup unit 1201 is connected with code stream control notification unit 1202.Call setup unit 1201 is used for conference control equipment and is connected with circuit network terminal and packet network terminal foundation calling respectively; Code stream control notification unit 1202 is used for described conference control equipment and determines that described packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, then notifies described circuit network terminal to carry out code stream control.
In embodiments of the present invention, be example with MCU as conference control equipment, but the conference control equipment of the embodiment of the invention comprise and is not limited to MCU that the conference control equipment that any and MCU have identical or identity function all can be used to substitute MCU.The circuit network terminal includes but not limited to H.320 terminal, can also be ISDN terminal, the PSTN terminal, and the packet network terminal includes but not limited to H.323 terminal, can also be sip terminal.
Preferably, shown in Figure 12 B, described bandwidth control apparatus 1200 also comprises: the invalid video Frame is removed unit 1203.Described invalid video Frame is removed unit 1203 and is connected with described code stream control notification unit 1202.Described invalid video Frame is removed unit 1203, is used for when transmitting code stream described invalid video infilled frame being removed the video code flow bandwidth that can receive with the terminal that reaches packet network.
Preferably, shown in Figure 12 C, described bandwidth control apparatus 1200 also comprises: time slot calculates and updating block 1204.Described time slot calculates and updating block 1204 is connected with described code stream control notification unit 1202.Described time slot calculates and updating block 1204, is used for the time slot according to the required minimizing of described current circuit network bandwidth calculation, and upgrades the time slot table according to the time slot that calculates required minimizing, behind the renewal time slot table, to the terminal transmission video refresh request of circuit network.
The beneficial effect of the embodiment of the invention is, by determining not satisfy the requirement of packet network video Data Transmission in the packet network bandwidth, notify described circuit network terminal to carry out code stream control, realized the stable reduction of speed in the video conference that circuit-switched network and packet network are used with, strengthen network-adaptive, improved the ease for use of mixed networking.
Embodiment seven
As shown in FIG. 13A, the bandwidth control terminal 1300 based on video conference of the embodiment of the invention comprises: call out connection response and set up unit 1301, code stream control notice receiving element 1302, code stream control unit 1303.Wherein, described calling connection response and set up unit 1301 and is connected with described code stream control notice receiving element 1302, described code stream control notice receiving element 1302 is again in 1303 connections of code stream control unit.Described calling connection response and set up unit 1301, the calling that is used for the response session control appliance connects; Described code stream control notice receiving element 1302 is used to receive conference control equipment transmitted stream control notice; Described code stream control unit 1303 is used for carrying out code stream control according to described code stream control notice, to reduce video Data Transmission speed.
Preferably, shown in Figure 13 B, described bandwidth control terminal 1300 also comprises: raising speed unit 1304.Described raising speed unit 1304 is connected with described code stream control unit 1303.Described raising speed unit 1304, be used for described reduction circuit network video Data Transmission speed after, if detect less than packet loss, then the Flow Control of transmitting code stream by cancellation limits and realizes that raising speed handles.
Preferably, shown in Figure 13 C, described code stream control unit 1303 comprises: invalid video Frame packing module 1305 is used for filling the invalid video Frame at described video data.
Preferably, shown in Figure 13 D, described code stream control unit 1303 also comprises: time slot table modified module 1306, video refresh response module 1307.Wherein, described time slot modified module 1306 is connected with described video refresh module 1307.Described time slot table modified module 1306 is used for the time slot table of described circuit network terminal is made amendment.Described video refresh module 1307, the video refresh request that the terminal that is used for circuit network sends according to conference control equipment is carried out video and is refreshed.
In embodiments of the present invention, be example with MCU as conference control equipment, but the conference control equipment of the embodiment of the invention comprise and is not limited to MCU that the conference control equipment that any and MCU have identical or identity function all can be used to substitute MCU.The circuit network terminal includes but not limited to H.320 terminal, can also be ISDN terminal, the PSTN terminal, and the packet network terminal includes but not limited to H.323 terminal, can also be sip terminal.
The beneficial effect of the embodiment of the invention is, described circuit network terminal is carried out code stream control, realized the stable reduction of speed in the video conference that circuit-switched network and packet network are used with, strengthened network-adaptive, improved the ease for use of mixed networking.
Embodiment eight
As shown in figure 14, for the bandwidth control system based on video conference of the embodiment of the invention comprises: conference control equipment 1400, circuit network terminal 1401 and IP network terminal 1402, conference control equipment 1400 is connected with circuit network terminal 1401 by circuit network, and is connected with IP network terminal 1402 by IP network; Conference control equipment 1400 comprises (with reference to figure 12A): call setup unit 1201 is used to set up with the calling of circuit network terminal with the IP network terminal and is connected; Code stream control notification unit 1202, be used for described conference control equipment and determine that described IP network bandwidth does not satisfy the requirement of IP network video Data Transmission, be used for described conference control equipment and determine that described packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, then notify described circuit network terminal to carry out code stream control, to reduce video Data Transmission speed.Described circuit network terminal 1401 comprises (with reference to figure 13A): call out connection response and set up unit 1301, the calling that is used for the response session control appliance connects; Code stream control notice receiving element 1302 is used to receive conference control equipment transmitted stream control notice; Code stream control unit 1303 is used for carrying out code stream control according to described code stream control notice, to reduce video Data Transmission speed.
In the embodiment of the invention, be example as conference control equipment, but the conference control equipment of the embodiment of the invention comprise and is not limited to MCU that the conference control equipment that any and MCU have identical or identity function all can be used to substitute MCU with MCU.The circuit network terminal includes but not limited to H.320 terminal.
Below receive MCU transmitted streams control notice with circuit network terminal 1401 after, it is to be example in the mode of filling the invalid video Frame that circuit network terminal 1401 carries out code stream control, specifies the bandwidth control system based on video conference of the embodiment of the invention.
The code stream of circuit network terminal before carrying out coded video bit stream as shown in Figure 4, wherein A represents audio frequency (Audio); V represents video (Video); F represents frame alignment word (FAS:Frame AlignmentSignal); B bit stream assignment signalling (Bit-rate Alignment Signal).If channel width is 128K, and audio frequency takies 48K, and video takies the channel width except that FAS, BAS and Audio.Behind call setup, H221 time slot table is fixing, and it is fixing promptly to look audio bandwidth, if when the actual audio code stream can not satisfy the 48K bandwidth, needs to replenish quiet code stream; When if the actual video code stream can not satisfy respective bandwidth, then need to fill the invalid video Frame, for example forward error correction (FEC:Forward Error Correction) infilled frame.
MCU convenes the meeting that contains circuit network terminal and IP terminal, and promptly MCU is respectively with terminal IP terminal, H.320 terminal connects; The IP terminal detects Network Packet Loss, to MCU feedback packet loss, perhaps sends Flow Control message to MCU, also can realize according to user's needs oneself; MCU sends Flow Control message to the IP terminal simultaneously according to the packet loss or the Flow Control bandwidth calculation network bandwidth; The IP terminal sends code stream according to the Flow Control bandwidth of MCU, realizes IP terminal reduction of speed; Behind the IP terminal reduction of speed, MCU sends flow-control command to terminal H.320; H.320 after terminal is received flow-control command, carry out code stream control in the mode of filling the invalid video code stream; Simultaneously the MCU side begins to detect from video infilled frame in the video code flow of terminal H.320; When transmitting code stream, the video infilled frame is removed, to reach the video code flow bandwidth that the IP terminal can receive.
Realized steady reduction of speed by above step.
Code stream figure behind the filling video infilled frame (fec frame) as shown in Figure 6.Wherein A represents: audio frequency (audio); V represents: video (video); F represents: frame alignment word (FAS:Frame AlignmentSignal); B represents: bit stream assignment signalling (Bit-rate Alignment Signal); D represents: the video infilled frame.
After above-mentioned steps has realized steady reduction of speed, if the improvement of the network between MCU and the IP terminal for example detects less than packet loss in continuous a period of time behind the reduction of speed, the MCU transmitting control commands, the Flow Control of cancellation forwarding code stream limits and realizes the raising speed processing.Described control command by expansion MBE (multibyte expansion) message realization form be Start_MBE}/N/＜x 〉/(N-1) bytes.Wherein { Start_MBE} is MBE; The MBE message identifier, N is the MBE message-length,＜x〉be the MBE information order, can use 0xCF, the information order that MBE reserves.As shown in Figure 7, be the MBE information order table that provides of inventive embodiments.N in Fig. 7: be fixed as 4 at present, can change during other parameters of subsequent expansion; Media channel sign: 1 video main flow, the auxilliary stream of 2 videos; The target bandwidth: with K is unit; Example: 768K fills out 0300 (16 system).
Realize stable reduction of speed in the video conference that switching network uses with by above step, further, after network takes a turn for the better, realized the raising speed processing.
The technique effect that the embodiment of the invention can reach is: by judging when the packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, notify described circuit network terminal to carry out code stream control, solved the problem of packet loss in the video conference that circuit-switched network and packet network are used with, realized the stable reduction of speed in the video conference that circuit-switched network and packet network are used with, strengthen network-adaptive, improved the ease for use of mixed networking.
Above-mentioned all embodiment just are used to set forth the present invention, and are not in order to restriction the present invention, and method provided by the invention is equally applicable to H.321 agreement.H.321 protocol frame is H.320 to expand on the framework, the implementation that the main ISDN of elaboration inserts (increase on basis H.320 the ISDN access signaling is handled, binding is handled, physical interface standard) is followed the H221/H242 agreement in the protocol frame H.320 equally; H.321 221 frame structures of section H described in H221 frame and the patent and transmission means are in full accord in the protocol frame, so the described situation of patent is applicable to H.321 agreement fully.
Above embodiment is the preferred embodiments of the disclosure, and common variation that those skilled in the art carries out in technical scheme of the present invention and replacement all should be included within protection scope of the present invention.
Claims (19)
1. the band width control method based on video conference is characterized in that, said method comprising the steps of:
Conference control equipment is set up to call out with circuit network terminal and packet network terminal respectively and is connected;
Described conference control equipment determines that described packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, then notifies described circuit network terminal to carry out code stream control, to reduce circuit network video Data Transmission speed.
2. the band width control method based on video conference according to claim 1 is characterized in that, after the described reduction circuit network video Data Transmission speed, determines to detect less than packet loss, and then the Flow Control of cancellation forwarding code stream limits and realizes the raising speed processing.
3. the band width control method based on video conference according to claim 1 is characterized in that, described code stream control comprises: fill the invalid video Frame in described video data.
4. the band width control method based on video conference according to claim 1 is characterized in that, described code stream control comprises: the time slot table to described circuit network terminal is made amendment.
5. the band width control method based on video conference according to claim 3, it is characterized in that, the control of described code stream also comprises: the described invalid video Frame removal that will fill when transmitting code stream, the video code flow bandwidth that can receive with the terminal that reaches packet network.
6. the band width control method based on video conference according to claim 4 is characterized in that, described time slot table to described circuit network terminal is made amendment and comprised:
Time slot according to the required minimizing of described current circuit network bandwidth calculation;
Upgrade the time slot table according to the time slot that calculates required minimizing;
After upgrading the time slot table, to the terminal transmission video refresh request of circuit network.
7. the band width control method based on video conference is characterized in that, said method comprising the steps of:
The circuit network terminal is connected with the calling of packet network terminal response conference control equipment, and foundation is connected with the calling of conference control equipment respectively;
The circuit network terminal receives conference control equipment transmitted stream control notice;
Described circuit network terminal carries out code stream control according to described code stream control notice, to reduce video Data Transmission speed.
8. the band width control method based on video conference according to claim 7 is characterized in that, described code stream control comprises: fill the invalid video Frame in described video data.
9. the band width control method based on video conference according to claim 7 is characterized in that, described code stream control comprises: the time slot table to described circuit network terminal is made amendment.
10. the band width control method based on video conference according to claim 9, it is characterized in that described time slot table to described circuit network terminal is made amendment and also comprised: the video refresh request that the terminal of circuit network sends according to conference control equipment is carried out video and is refreshed.
11. the bandwidth control apparatus based on video conference is characterized in that, described device comprises:
The call setup unit is used for conference control equipment and is connected with circuit network terminal and packet network terminal foundation calling respectively;
Code stream control notification unit is used for described conference control equipment and determines that described packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, then notifies described circuit network terminal to carry out code stream control.
12. the bandwidth control apparatus based on video conference according to claim 11, it is characterized in that, described device also comprises: the invalid video Frame is removed the unit, the invalid video Frame that is used for when transmitting code stream described circuit network terminal being filled is removed, the video code flow bandwidth that can receive with the terminal that reaches packet network.
13. the bandwidth control apparatus based on video conference according to claim 11, it is characterized in that, described device also comprises: time slot calculates and updating block, be used for time slot according to the required minimizing of described current circuit network bandwidth calculation, and upgrade the time slot table according to the time slot that calculates required minimizing, after upgrading the time slot table, to the terminal transmission video refresh request of circuit network.
14. the bandwidth control terminal based on video conference is characterized in that described terminal comprises:
Call out connection response and set up the unit, the calling that is used for the response session control appliance connects;
Code stream control notice receiving element is used to receive conference control equipment transmitted stream control notice;
The code stream control unit is used for carrying out code stream control according to described code stream control notice, to reduce video Data Transmission speed.
15. the bandwidth control terminal based on video conference according to claim 14, it is characterized in that, described terminal also comprises: the raising speed unit, after being used for described reduction circuit network video Data Transmission speed, if detect, then limit and realize the raising speed processing by the Flow Control of cancelling the forwarding code stream less than packet loss.
16. the bandwidth control terminal based on video conference according to claim 15 is characterized in that, described code stream control unit comprises: invalid video Frame packing module is used for filling the invalid video Frame at described video data.
17. the bandwidth control terminal based on video conference according to claim 15 is characterized in that, described code stream control unit also comprises: time slot table modified module is used for the time slot table of described circuit network terminal is made amendment.
18. the bandwidth control terminal based on video conference according to claim 15, it is characterized in that, described code stream control unit also comprises: video refresh response module, described video refreshes corresponding module and is connected with the time slot modified module, and the video refresh request that the terminal that is used for circuit network sends according to conference control equipment is carried out video and refreshed.
19. bandwidth control system based on video conference, described system comprises: conference control equipment, circuit network terminal and IP network terminal, described conference control equipment is connected with described circuit network terminal by circuit network, and is connected with described IP network terminal by IP network; It is characterized in that,
Described conference control equipment comprises the call setup unit, is used to set up with the calling of circuit network terminal with the IP network terminal be connected; Code stream control notification unit is used for described conference control equipment and determines that described IP network bandwidth does not satisfy the requirement of IP network video Data Transmission, then notifies described circuit network terminal to carry out code stream control;
Described circuit network terminal comprises: call out connection response and set up the unit, the calling that is used for the response session control appliance connects; Code stream control notice receiving element is used to receive conference control equipment transmitted stream control notice; The code stream control unit is used for carrying out code stream control according to described code stream control notice, to reduce video Data Transmission speed.
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| CN2009100028114A CN101488916B (en) | 2009-01-24 | 2009-01-24 | Band-width control method, apparatus, terminal and system based on video conference |
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| CN2009100028114A CN101488916B (en) | 2009-01-24 | 2009-01-24 | Band-width control method, apparatus, terminal and system based on video conference |
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| CN101977185A (en) * | 2010-10-14 | 2011-02-16 | 杭州海康威视数字技术股份有限公司 | Digital video recorder in video monitoring system and network connection control method thereof |
| CN101984661A (en) * | 2010-11-23 | 2011-03-09 | 广东威创视讯科技股份有限公司 | Information transmission method of video conference system and video conference system |
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| CN109981427B (en) * | 2019-03-29 | 2021-03-16 | 烽火通信科技股份有限公司 | Multi-service access network method and system |
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