CN101404748A - Video data transmission system and method used for large-scale high-definition network video conference - Google Patents
Video data transmission system and method used for large-scale high-definition network video conference Download PDFInfo
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Abstract
The invention provides a video data transmission system for a large-scale high-definition network video conference. The system comprises one MGR, at least two entity MCUs and more than two clients; the MGR and each entity MCU are respectively in network connection, and each client and the entity MCUs are respectively in network connection; each client comprises a camera, a video coder, a virtual channel sending management module which are connected in sequence, and a virtual channel receiving management module, a video decoder, a display device which are connected in sequence, and the two ends of each video decoder are respectively connected with the virtual channel receiving management module and the display device; each entity MCU comprises a cluster management module, a virtual channel transmitting module and a virtual channel logic control module. The video data transmission system effectively improves the resource utilization rate of the system, reduces the workload of logic MCU and each entity MCU, can ensure the original resolutions of the video data in the large-scale high-definition network video conference, and greatly improves the capability of supporting the high-definition video.
Description
Technical field
The present invention relates to field of video transmission, be specifically related to be used for the video-frequency data transmission system and the method for large-scale high-definition network video conference.
Background technology
Network teleconference system realizes virtual meeting by the network communications technology, make geographically the user that disperses can copolymerization one place, by multiple mode exchange of information such as figure, sound, support people to carry out real time information at a distance and exchange and the application system of sharing, carrying out collaborative work.The network teleconference is very easy between the cooperation member and exchanges truly, intuitively, and remote teaching and meeting are had very important effect.Network teleconference system institute's accepted standard and agreement are mainly formulated as required by ITU-T, comprise: H.320 agreement, H.323 agreement, MPEG-4 standard and standard H.264, wherein H.264 standard combines H.263 agreement and MPEG-4 standard in the agreement H.323, solved at present based on the MPEG-4 standard of software video meeting can't with the terminal compatibling problem of agreement H.323, make it to become best video compression protocols at present.
As shown in Figure 1, in traditional network teleconference system, user side sends to entity multipoint control unit (MCU) with video data separately, by concentrating screen, coding are decoded, mixed to video data, and then video data sent to each user side, if the agreement difference that each user side adopted, then the encoding and decoding of entity MCU load can be very heavy.When carrying out extensive video conference, number of users is more general at present adopts the method for tree-shaped cascade to expand MCU, as shown in Figure 2; If the personnel participating in the meeting is many, had more advanced stack manner to expand MCU at present, as shown in Figure 3, wherein stack manner is exactly to adopt the master and slave MCU of a plurality of entities to constitute the method for 1 logic MCU, user's number that it can insert increases greatly, but still has following defective:
(1) stack manner expansion MCU makes the logic MCU after the expansion can bear more number of users, but because each the entity MCU in the system needs to bear coding, decoding and mixed screen work, thereby cause its extendible scale still limited, high definition user's largest extension scale is about 300 MCU;
(2) in the network teleconference, the work that user side is born is less relatively, and insufficient utilization has just caused the waste of this part resource in the whole system;
(3) in the network teleconference system that adopts stack manner expansion MCU, because it logically is 1 MCU that all entity MCU pile up, therefore its operation principle is the same with single entity MCU, for example, have 4 terminal uses to participate in this meeting, the resolution sizes of the video data that each user side sent is that (resolution of CIF is 352 * 288 to 4CIF; The resolution of 4CIF is 704 * 576) because the entity MCU that piles up must carry out mixing to this, the video mixing that is about to 4 4CIF becomes the video data of 1 4CIF, when therefore passing user side back, the resolution of each video data has become the CIF size.Therefore, to remain to reduce resolution be that cost improves transmitting video data speed to stack MCU.Therefore in the large-scale high-definition network video conference system, this defective is difficult to tolerate.
Summary of the invention
The objective of the invention is to overcome the above-mentioned shortcoming and defect of prior art, a kind of video-frequency data transmission system that is used for large-scale high-definition network video conference is provided, this system becomes single logic MCU with more a plurality of physics MCU clusters, wherein each entity physics MCU and the logic MCU in this system no longer decodes to video data, mixing, the work of coding, come forwarding video data by the multicast virtual passage between entity MCU and the entity MCU, between entity MCU and user side, then video data is transmitted to targeted customer's end by the transmission tunnel of building up via logic MCU, finish the decoding work of video data at last by targeted customer's end, and need not to mix screen once more and encode, therefore improved usage factor of system resource effectively, alleviated the live load of logic MCU and each entity MCU, guaranteed the robustness (Robustness) of single entity MCU, simultaneously also guaranteed the performance of whole logic MCU, thereby can allow more terminal participate in video conference; Can in large-scale high-definition network video conference, guarantee the original resolution of video data, thereby improve the ability of supporting HD video greatly.
The present invention also aims to provide the method that realizes video Data Transmission by the above-mentioned video-frequency data transmission system that is used for large-scale high-definition network video conference.
The object of the invention is achieved through the following technical solutions: the video-frequency data transmission system that is used for large-scale high-definition network video conference comprises at least 2 entity MCU, 2 above user sides, 1 MGR, described MGR be used for making add the MCU cluster all entity MCU when handling with the sequential related task as the signaling time-sequence control module of 1 logic MCU according to the sequential processing inter-related task, described MGR and each entity MCU carry out network respectively and connect to form the MCU cluster, and each user side carries out network with entity MCU respectively and is connected; Described each user side includes the camera, video encoder, the tunnel that connect successively and sends administration module, and the tunnel receiving management module, Video Decoder, the display device that connect successively, each Video Decoder two ends is connected with tunnel receiving management module, display device respectively.
Described entity MCU comprises at least and being used for and MGR carries out synchronously and the entity MCU that makes all add the MCU clusters merges into 1 logic MCU and sets up the multicast channel between the entity MCU cluster management module, the virtual channel logic control module that is used for creating the reception tunnel between entity MCU and the user side and creates the transmission tunnel between entity MCU and the user side and create the forwarding tunnel between entity MCU and the entity MCU at described multicast channel, be used to transmit the tunnel forwarding module of the video data that MCU receives.
Described reception tunnel, the local video data that are used for that entity MCU has been received send to targeted customer's end; Described transmission tunnel is used for the user terminal video data are sent to entity MCU.
Described MGR is connected with the cluster management module of each entity MCU, forms the cluster management passage of MGR and each entity MCU.
The quantity-1 of the Video Decoder quantity=user side of described each user side.
The video encoder of described each user side is H.26X serial encoder.
The Video Decoder of described each user side is H.26X serial decoder.
The tunnel of described each user side sends administration module and includes interconnective encoder, network transmitting apparatus, this encoder is mainly used in the tunnel identification information of mark video data, and this tunnel identification information comprises at least: the video encoder type that is adopted, the resolution sizes of video data and tunnel number; Described network transmitting apparatus sends to MCU with the video data that the encoder mark finishes.
The tunnel receiving management module of described each user side includes interconnective network receiving equipment, decoder; This network receiving equipment is mainly used in receiving video data; Described decoder is mainly used in the tunnel identification information of analyzing video data: the video data that receives is decoded according to different channel number arrangements, obtain the type of coding selection corresponding video decoding device of video data and it is carried out initialization according to decoded result then, then with video data input video decoder decode, the video data that does not change resolution that final acquisition can directly show.
Utilize the above-mentioned video-frequency data transmission system that is used for large-scale high-definition network video conference to realize the method for video Data Transmission, comprise the steps:
(1) MGR sets up 1 multicast channel by the cluster management passage respectively according to all entity MCU of instruction notification and is used for receiving and dispatching video data;
(3) the camera collection video data of local user's end, and send to video encoder;
(4) video encoder of local user end is to the described coding video data of step (2), and sends to tunnel and send administration module;
(5) tunnel of local user's end sends the video data mark tunnel identification information of administration module to receiving, and the video data with local user's end is transferred to local entity MCU by sending tunnel then; Described tunnel identification information comprises type of coding, resolution, transmission tunnel number at least;
(6) after local entity MCU received video data, the tunnel forwarding module sent to other entity MCU with video data by the forwarding tunnel in the multicast channel;
(7) when other entity MCU receives video data in multicast channel after, check all whether this video data target terminal is the user side that himself connects, if then the tunnel forwarding module is not handled this video data, if then the tunnel forwarding module sends to this video data in the reception tunnel of respective user end;
(8) the tunnel receiving management module of respective user end is by receiving the tunnel receiving video data, then received video data is carried out the analysis of tunnel identification information, obtain the type of coding of video data, select corresponding Video Decoder according to the type of coding of video data again, and this Video Decoder carried out initialization, the final video decoder sends to display device with the video data of reduction and shows.
In the said method, the size of described transmission tunnel and reception tunnel is adjusted according to the size of video data.
The video-frequency data transmission system that the present invention is used for large-scale high-definition network video conference has the following advantages with respect to prior art:
(1) the present invention has broken through the technical bottleneck of conventional video conference system, whole system will not need to decode, mix the high load capacity work of screen, coding, after concentrating the work of the decoding bear to be distributed to each user side the entity MCU, so not only improved usage factor of system resource effectively, alleviated the live load of entity MCU, guaranteed the robustness of single entity MCU, can allow more terminal participate in video conference;
(2) the present invention has broken through the mixed screen of entity MCU of conventional video conference system to reduce the defective that resolution obtains efficiency of transmission, when guaranteeing user's efficiency of transmission, can not reduce the original resolution of video data, therefore the demonstration of user side can not increase because of the number of users of participation video conference and thicken, and makes the present invention support the HD video ability to improve greatly;
(3) tunnel comes transmitting video data by creating independently in the present invention, makes the most of work of entity MCU concentrate on the management of tunnel forwarding of data, thereby has guaranteed the speed and the quality of transfer of data.
Description of drawings
Fig. 1 is the structural representation of legacy network video conferencing system;
Fig. 2 is the structural representation that MCU is expanded in traditional tree-shaped cascade;
Fig. 3 is the structural representation that advanced at present stack manner is expanded MCU;
Fig. 4 is the structural representation of system of the present invention;
Fig. 5 is the structural representation that the entity MCU among the present invention forms 1 logic MCU;
Fig. 6 is the structural representation that the single entity MCU among the present invention is connected with user side;
Fig. 7 is the workflow diagram of system of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
The video-frequency data transmission system that the present invention shown in Figure 4 is used for large-scale high-definition network video conference comprises 1MGR, 3 entity MCU (MCU1, MCU2, MCU3) and 12 user sides, described MGR be used for making add the MCU cluster all entity MCU (MCU1, MCU2, MCU3) when handling with the sequential related task as the signaling time-sequence control module of 1 logic MCU according to the sequential processing inter-related task; Described MGR and MCU1, MCU2, MCU3 carry out network respectively and connect to form the MCU cluster, wherein the user side of MCU1 map network connection comprises EP11, EP12, EP13, EP14, the user side that the MCU2 map network connects comprises EP21, EP22, EP23, EP24, and the user side that the MCU3 map network connects comprises EP31, EP32, EP33, EP34.
Figure 5 shows that the entity MCU among the present invention forms the structure of 1 logic MCU; MCU1, MCU2, MCU3 all comprises at least and being used for and MGR carries out synchronously and the entity MCU that makes all add the MCU clusters merges into 1 logic MCU and sets up the multicast channel between the entity MCU cluster management module, the virtual channel logic control module that is used for creating the reception tunnel between entity MCU and the user side and creates the transmission tunnel between entity MCU and the user side and create the forwarding tunnel between entity MCU and the entity MCU at the multicast channel of having created between the entity MCU, be used to transmit the tunnel forwarding module of the video data that MCU receives.
Described reception tunnel, the local video data that are used for that entity MCU has been received send to targeted customer's end.
Described transmission tunnel is used for the user terminal video data are sent to entity MCU.
Described MGR is connected with the cluster management module of each entity MCU, the cluster management passage of forming MGR and each entity MCU, as shown in Figure 5, the cluster management passage that is connected with MCU1, MCU2, MCU3 of MGR is respectively cluster management passage 1, cluster management passage 2, cluster management passage 3.
As shown in Figure 5, the entity MCU of described virtual channel logic control module establishment and the forwarding tunnel between the entity MCU.Wherein MCU1 is to MCU2, MCU3, and MCU2 is to MCU1, MCU3, and MCU3 is followed successively by forwarding tunnel 1, transmits tunnel 2, transmits tunnel 3 to the forwarding tunnel that MCU1, MCU1 carry out the video data transmission.Correspondingly, MCU1 carries out the forwarding tunnel of video data reception for transmitting tunnel 2, transmitting tunnel 3; MCU2 carries out the forwarding tunnel of video data reception for transmitting tunnel 1, transmitting tunnel 3; MCU3 carries out the forwarding tunnel of video data reception for transmitting tunnel 1, transmitting tunnel 2.
Be illustrated in figure 6 as the structure that the single entity MCU among the present invention is connected with user side, 4 user sides (EP1, EP2, EP3, EP4) are connected with entity MCU network respectively.
As shown in Figure 6, each user side comprises that successively the camera, video encoder, the tunnel that connect send administration module, also comprises the tunnel receiving management module that connects successively, 3 Video Decoders, display device.
The tunnel of described each user side sends administration module and includes interconnective encoder, network transmitting apparatus, this encoder is mainly used in mark tunnel identification information, and described tunnel identification information comprises the resolution sizes of the video encoder type that adopted, video data and tunnel number; The tunnel receiving management module of described each user side includes interconnective network receiving equipment, decoder, and this decoder is mainly used in the resolution sizes of type, video data of identification video data and tunnel number.
As shown in Figure 6, H.26X the type of the video encoder that adopted of particular type and the user side of the Video Decoder of series is corresponding in the system of the present invention.H.261 EP1, EP2, EP3, EP4 adopt respectively, H.263, H.264, video encoder H.264, and included 3 Video Decoders of EP1 promptly H.26X the decoder of series be respectively H.263 decoder, H.264 decoder, decoder H.264, promptly the type with the video encoder of EP2, EP3, EP4 is corresponding consistent; Included 3 Video Decoders of EP2 promptly H.26X the decoder of series be respectively H.261 decoder, H.264 decoder, decoder H.264, promptly the type with the video encoder of EP1, EP3, EP4 is corresponding consistent; Included 3 Video Decoders of EP3 promptly H.26X the decoder of series be respectively H.261 decoder, H.263 decoder, decoder H.264, promptly the type with the video encoder of EP1, EP2, EP4 is corresponding consistent; Included 3 Video Decoders of EP4 promptly H.26X the decoder of series be respectively H.261 decoder, H.263 decoder, decoder H.264, promptly the type with the video encoder of EP1, EP2, EP3 is corresponding consistent.
The interface channel of EP1 and MCU is a RTP passage 1, comprises 4 tunnels, is respectively to send tunnel 1, receives tunnel 2,3,4; The interface channel of EP2 and MCU is a RTP passage 2, comprises 4 tunnels, is respectively to send tunnel 2, receives tunnel 1,3,4; The interface channel of EP3 and MCU is a RTP passage 3, comprises 4 tunnels, is respectively to send tunnel 3, receives tunnel 1,2,4; The interface channel of EP4 and MCU is a RTP passage 4, comprises 4 tunnels, is respectively to send tunnel 4, receives tunnel 1,2,3.
Utilize the above-mentioned video-frequency data transmission system that is used for large-scale high-definition network video conference to realize the method for video Data Transmission, as shown in Figure 7, comprise the steps:
(1) MGR sets up 1 multicast channel by the cluster management passage respectively according to all entity MCU of instruction notification and is used for receiving and dispatching video data;
(3) the camera collection video data of local user's end, and send to video encoder;
(4) video encoder of local user end is to the described coding video data of step (2), and sends to tunnel and send administration module;
(5) tunnel of local user's end sends the video data mark tunnel identification information of administration module to receiving, and the video data with local user's end is transferred to local entity MCU by sending tunnel then; Described tunnel identification information comprises type of coding, resolution, transmission tunnel number at least;
(6) after local entity MCU received video data, the tunnel forwarding module sent to other entity MCU with video data by the forwarding tunnel in the multicast channel;
(7) when other entity MCU receives video data in multicast channel after, check all whether this video data target terminal is the user side that himself connects, if then the tunnel forwarding module is not handled this video data, if then the tunnel forwarding module sends to this video data in the reception tunnel of respective user end;
(8) the tunnel receiving management module of respective user end is by receiving the tunnel receiving video data, then received video data is carried out the analysis of tunnel identification information, obtain the type of coding of video data, select corresponding Video Decoder according to the type of coding of video data again, and this Video Decoder carried out initialization, the final video decoder sends to display device with the video data of reduction and shows.
In the said method, the size of described transmission tunnel and reception tunnel is adjusted according to the size of video data.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1, the video-frequency data transmission system that is used for large-scale high-definition network video conference, it is characterized in that: comprise at least 2 entity MCU, 2 above user sides, 1 MGR, described MGR be used for making add the MCU cluster all entity MCU when handling with the sequential related task as the signaling time-sequence control module of 1 logic MCU according to the sequential processing inter-related task, described MGR and each entity MCU carry out network respectively and connect to form the MCU cluster, and each user side carries out network with entity MCU respectively and is connected; Described each user side includes the camera, video encoder, the tunnel that connect successively and sends administration module, and the tunnel receiving management module, Video Decoder, the display device that connect successively, each Video Decoder two ends is connected with tunnel receiving management module, display device respectively;
Described entity MCU comprises at least: be used for and MGR carries out synchronously and the entity MCU that makes all add the MCU clusters merges into 1 logic MCU and sets up the multicast channel between the entity MCU cluster management module; Be used for creating the reception tunnel between entity MCU and the user side, the virtual channel logic control module of creating the transmission tunnel between entity MCU and the user side and creating the forwarding tunnel between entity MCU and the entity MCU at described multicast channel; Be used to transmit the tunnel forwarding module of the video data that MCU receives;
Described MGR is connected with the cluster management module of each entity MCU, forms the cluster management passage of MGR and each entity MCU.
2, according to the described video-frequency data transmission system that is used for large-scale high-definition network video conference of claim 1, it is characterized in that: the quantity-1 of the Video Decoder quantity=user side of described each user side.
3, according to the described video-frequency data transmission system that is used for large-scale high-definition network video conference of claim 1, it is characterized in that: the video encoder of described each user side is H.26X serial encoder, and the video encoder of described each user side also is H.26X serial encoder.
4, according to the described video-frequency data transmission system that is used for large-scale high-definition network video conference of claim 1, it is characterized in that: the tunnel of described each user side sends the network transmitting apparatus that administration module includes the interconnective encoder that is used to mark the tunnel identification information of video data, is used for the video data that the encoder mark finishes is sent to MCU; The tunnel receiving management module of described each user side includes the interconnective network receiving equipment that is used for receiving video data, be used to analyze the decoder of the tunnel identification information of video data.
5, a kind of method of utilizing the described video-frequency data transmission system that is used for large-scale high-definition network video conference of claim 1 to realize video Data Transmission is characterized in that, comprises the steps:
(1) MGR sets up 1 multicast channel by the cluster management passage respectively according to all entity MCU of instruction notification and is used for receiving and dispatching video data;
(3) the camera collection video data of local user's end, and send to video encoder;
(4) video encoder of local user end is to the described coding video data of step (2), and sends to tunnel and send administration module;
(5) tunnel of local user's end sends the video data mark tunnel identification information of administration module to receiving, and the video data with local user's end is transferred to local entity MCU by sending tunnel then;
(6) after local entity MCU received video data, the tunnel forwarding module sent to other entity MCU with video data by the forwarding tunnel in the multicast channel;
(7) when other entity MCU receives video data in multicast channel after, check all whether this video data target terminal is the user side that himself connects, if then the tunnel forwarding module is not handled this video data, if then the tunnel forwarding module sends to this video data in the reception tunnel of respective user end;
(8) the tunnel receiving management module of respective user end is by receiving the tunnel receiving video data, then received video data is carried out the analysis of tunnel identification information, obtain the type of coding of video data, select corresponding Video Decoder according to the type of coding of video data again, and this Video Decoder carried out initialization, the final video decoder sends to display device with the video data of reduction and shows.
6, the method for transmitting video data that is used for large-scale high-definition network video conference according to claim 5 is characterized in that: the described tunnel identification information of step (5) comprises type of coding, resolution, transmission tunnel number at least.
7, the method for transmitting video data that is used for large-scale high-definition network video conference according to claim 6 is characterized in that: the size of described transmission tunnel and reception tunnel is adjusted according to the size of video data.
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