CN106331396B - Multimedia processing method and system for telephone conference - Google Patents
Multimedia processing method and system for telephone conference Download PDFInfo
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- CN106331396B CN106331396B CN201510324545.2A CN201510324545A CN106331396B CN 106331396 B CN106331396 B CN 106331396B CN 201510324545 A CN201510324545 A CN 201510324545A CN 106331396 B CN106331396 B CN 106331396B
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Abstract
The invention provides a multimedia processing method of a telephone conference, which comprises at least one UA device with multimedia mixed processing capability and a plurality of conference-participating terminal UA users in a telephone conference system, wherein the UA device can carry out media interaction in a conference server, and the multimedia processing method mainly comprises the following steps: step a: the UA user initiates a call to enter a telephone conference; step b: the conference server will inquire the media capability database stored in the database, and judge whether the UA device with multimedia hybrid processing capability exists in the local area network N of the UA user account. And c, if the judgment result in the step b is yes, starting an intra-office sound mixing conference mode, and controlling other participants to communicate with the intra-office sound mixing conference mode, so that the purpose of saving bandwidth is achieved.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to an audio and video hybrid processing technology on the basis of mobile communication equipment.
Background
With the development of VoIP technology, audio and video conferences have a large market space, and the contradiction between high-definition communication requirements and bandwidth is increasingly sharp, so that the invention provides a method for improving communication quality under the condition of limited bandwidth. The working principle of the conference server realized based on the SIP standard at present is as follows: all the clients independently send RTP streams to the conference server, and the conference server mixes the RTP streams and then sends the mixed RTP streams to all persons in the conference. In this way, although the functions of the modules of the design mechanism are independent and clear, the requirement on the network bandwidth is higher, the characteristic that all UAs (User agents) in a private network are in the same network is not utilized, and the RTP stream is directly transferred to a conference server; it can also cause the conference server to be over stressed. Considering that SIP and related standards do not currently provide a standard for how to optimize and solve this problem, the present invention will disclose a multimedia application for teleconferencing to solve the above-mentioned problem.
Disclosure of Invention
The invention aims to provide a multimedia processing method of a teleconference, so that a terminal of the same private network can perform media interaction with a conference server through a terminal with audio mixing capability.
A multimedia processing method for telephone conference, in the telephone conference system, includes at least one UA device with multimedia mixed processing ability, and several conference terminal UA users, the UA device can interact with the local media of the conference server, the multimedia processing method mainly includes the following steps: step a: the UA user initiates a call to enter a telephone conference; step b: the conference server will inquire the media capability database stored in the database, and judge whether the UA device with multimedia hybrid processing capability exists in the local area network N of the UA user account. If the judgment result in the step b is yes, starting an intra-office mixing conference mode; and if the judgment result in the step b is negative, starting a common conference mode, namely carrying out multimedia mixing processing by the conference server. The method further includes the following steps in the local mixing conference mode: step c: the conference server modifies SDP information of the SIP signaling into UA equipment; step d: the UA user transfers and sends the RTP stream to the IP and the port of the UA device, and the UA user performs a first multimedia mixing process, namely mixing and/or frequency mixing process to generate an intra-office mixed RTP stream.
Preferably, in the multimedia processing method for the teleconference, when the UA user and the UA device start or quit, the broadcast signaling in the local area network N carries the media capability information of the UA user, and the other UA users in the local area network N record the media capability information and the SIP account of the UA user to generate the media capability data table.
Preferably, in the multimedia processing method for the teleconference, when the UA user and the UA device are respectively registered to the conference server at intervals, the respective media capability information and the SIP account number are carried in the SIP registration signaling, and the conference server reads the media capability data table and stores the media capability data table in the database to generate the media capability database.
Preferably, in the multimedia processing method for a teleconference, when the UA device exits the conference, the method further includes the following steps: judging whether other UA equipment with multimedia hybrid processing capability exists in the local area network N in the conference; if other UA equipment exists, the SDP content is renegotiated, and in the subsequent conference process, the other UA equipment carries out sound mixing and/or frequency mixing treatment; if no other UA device exists or the SDP negotiation with other UA device fails, the conference server will fill the media information of the conference server in the SDP content and re-enter the ordinary conference mode.
Preferably, in the multimedia processing method for a teleconference, if the teleconference simultaneously includes UA users of a non-local area network N, the method further includes a second multimedia mixing process for generating a conference mixed RTP stream, that is, the conference server performs mixing process on the intra-office mixed RTP stream and the media stream of the UA user in the non-local area network N; the conference mixed RTP stream may be forwarded by the UA device to a UA user of the local area network N.
Preferably, in the multimedia processing method for the teleconference, if the intra-office audio mixing conference mode is adopted, the conference server judges whether the UA user and the UA device belong to the same conference; if not, the conference server sends a private message to the UA device, so that the UA device automatically generates a bridge to the conference server, and when the UA user sends the RTP stream to the UA device, the UA device uses the bridge to relay the RTP stream to the conference server.
The invention also provides a multimedia processing system for a teleconference, comprising: the conference server, several UA users and at least one UA device, the UA device has multimedia mixed processing ability, the conference server mainly includes: the network service module is responsible for reading data of a media capability data table from a UA user during registration to perform recording and sorting so as to generate a media capability database; the media capability database is used for storing and recording UA users, lists of associated in-office SIP accounts and media information of the UA users, and SIP accounts and media capability information of the UA equipment; and the local media processing control module controls whether to start an internal audio mixing conference mode during the conference call, and further modifies the SDP information into the UA equipment.
In addition, the UA user mainly includes the following functional units: the media capability data table comprises SIP accounts of all other UA users and UA equipment in the UA user SIP account bureau and corresponding media capability information; and the media transmission control unit is used for controlling the transmission flow direction of the UA user multimedia data, cooperating with the network data transmission unit when the called conference enters an in-office audio mixing conference mode, and sending the RTP flow of the audio and video data to the UA equipment end in the local area network according to the modified SDP information of the conference server, wherein in the ordinary conference mode, the audio and video data of the UA user are directly sent to the conference server for processing.
The invention utilizes the characteristic that a plurality of terminals are in the same local area network, each UA user/UA device carries processing capacity in the signaling, the conference server selects one UA device as the audio mixing processing unit of the local area network according to the related information, and sends the related SIP signaling to control other UA users to communicate with the UA device, thereby achieving the purpose of saving bandwidth. The technical scheme provided by the invention can ensure that the conference server saves bandwidth and pressure, and all UAs in the office can quickly and clearly see or hear audio or video from the office.
Drawings
Fig. 1 is a diagram of networking in a conventional conference mode;
fig. 2 is a first networking diagram of implementing an intra-office mixing conference mode according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating UA device start/registration according to an embodiment of the present invention;
fig. 4 is a flowchart of implementing an intra-office mixing conference mode according to an embodiment of the present invention;
fig. 5 is a second networking diagram of implementing an intra-office mixing conference mode according to an embodiment of the present invention;
fig. 6 is a functional block diagram of a conferencing server and a UA in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly and clearly understood, the technical solutions in the embodiments of the present invention are described below in conjunction with the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments that can be derived by one skilled in the art from the embodiments given herein are intended to be within the scope of the invention.
The invention utilizes the characteristic that a plurality of terminals are in the same local area network, each UA user carries respective audio and video processing capability information in the signaling, the conference server selects one UA device as a sound mixing and/or frequency mixing processing unit of the local area network according to the related information, and sends the related SIP signaling to control other UA users to communicate with the UA device, thereby achieving the purpose of saving bandwidth. In the following specific embodiments, we individually take audio mixing in a local area network as an example for individual description, and for convenience of description, we collectively refer to common terminal devices as UA users, and refer to terminal devices with audio/video processing capabilities as UA devices.
Fig. 2 is a first networking diagram of implementing an intra-office mixing conference mode according to an embodiment of the present invention. As can be seen from this figure, the conference system specifically includes: conference server, UA1 user, UA2 device, UA 3 user.
The conference system in fig. 2 provides a mixing UA2 device with capabilities of mixing, relaying RTP and SIP proxy, and finds that the UA2 device and other UA users are in the same private network. Meanwhile, when all the UA users/UA devices are started or quit, the device logs in or logs out in the broadcast station, and carries the capability information of the device, such as: the mixing capability of the device. In addition, the UA user takes the SIP account numbers and media capabilities of other UA users in the local office at the time of interval SIP registration, so that the conference server preferentially selects the UA device with the audio mixing capability for communication when entering a meeting.
In order to implement mixing processing of UA devices in a teleconference, in the present invention, when all UA users/devices are started/closed and register with a public network conference server, the following operation steps of registration configuration must be completed, and at this time, we use UA1 user to explain:
step 310: the UA1 user broadcasts all other UA users in the station at startup and shutdown, and carries own media capability information, such as: the client can broadcast the local information, wherein Mix Audio:1 indicates that the client has Audio mixing capability:
Sip-account:1000
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): rtpmap:8 PCMA/8000
Mix Audio:1
Addr:172.172.172.36
step 320: after receiving the broadcast information, the other UA users in the local area network record the media capabilities of the UA1 user in a media capability data table in a local memory, so as to use the media capabilities in subsequent steps. Similarly, the UA1 user may also receive broadcast information of other UA users and UA devices in the office, read media capability information and SIP account of the UA users in each office, and store them in a media capability data table stored in the UA1 user memory.
Step 330: when the UA1 user registers to the public network conference server at intervals, the UA1 user takes the information of the SIP account numbers and the media capabilities of other UA users in the bureau, which is recorded in the memory of the UA1 user in step 320.
Step 340: the conference server receives the registration information of the UA1 user, and after the UA1 user successfully registers, the conference server starts the media capability recording function of the conference server, that is: reading and saving a media capability data table of the user of the UA1, that is, recording a SIP account list and corresponding media capabilities in the local area network associated with the registration account of the user of the UA1, and saving and generating a media capability database in a database of the conference server. In the invention, the media capability database comprises SIP account lists and corresponding media capability information in the associated offices of all UA users registered on the conference server. Through the reading analysis of the media capability database, it can know which UA users belong to a local area network, and can judge those UA devices with mixing/frequency processing capability.
In addition, in step 340, since the media capability recording function of the conference server is not the SIP standard function, in order to implement this function, a switch may be provided on the conference server to control whether to turn on this function.
Fig. 4 is a flowchart illustrating a procedure for implementing an intra-office mixing conference mode according to an embodiment of the present invention.
Step 410: the UA1 user initiates a call INVITE to a conference call.
Step 420: upon receiving the conference call from UA1 user, the conference server searches the UA media capability database in the database to determine whether a UA device with audio mixing function exists in the call account lan, and writes the information into the database in step 340.
Step 430: when the conference server finds the UA device having the audio mixing function in the office, in the embodiment of the present invention, if the UA2 device has the audio mixing function and the UA1 user and the UA2 user both belong to a lan, step 440 is performed again to further determine whether the UA1 user and the UA2 user both belong to a conference, otherwise, the conference mode is entered into the normal conference mode.
Step 440: the conference server continuously judges whether the UA2 user is in the same conference, at this time, the conference server stores the number corresponding to each call, and this number is the conference number, if the numbers are the same, it indicates that the UA1 user and the UA2 device belong to the same conference, the operation continues in step 450, and the intra-office mixing conference mode is started, otherwise, the ordinary conference mode is entered.
Step 450: and (3) opening an intra-office mixing conference mode, and modifying the SDP information of 200OK into UA2 equipment by the conference server, namely modifying the contact IP and the port of the corresponding mixing UA2 equipment in the SDP protocol of 200 OK. At the UA1 user end, after receiving 200OK, it takes out the SDP information in the packet and gets the IP and port of the new contact UA2 device, so that during the subsequent conference call, the UA1 user will forward the RTP stream to the port and IP. The SDP content is brought by the UA2 in the INVITE to the conference server of the public network, and can be used as a standard SIP flow, and the conference server records the SDP content thereof to the database, and the information can be stored in the database by the conference server.
Step 460: calling UA1 the user is in RTP stream communication with UA2 device. At this point UA1 sends RTP to the IP and port of the SDP, according to the IP and port. When the UA2 device is inactive, it should turn on the mixing function, and send the RTP stream received from the office to the conference server after mixing. SIP signaling of UA1 user and UA2 user interacts with conference server of public network in conference process.
Step 470: and opening a common conference mode, wherein the conference server does not modify the 200OK SDP, and according to the prior art, the conference server fills the media information supported by the conference server into the 200OK SDP, namely the 200OK SDP is filled with the IP and the port of the conference server. The subsequent UA user initiating the call communicates the RTP stream directly with the conference server.
If the UA2 device exits the conference, the UA user relaying the RTP stream below the UA2 device will receive a request from a conference server in the public network to request for the negotiated SDP content, and then check whether there are other UA users capable of mixing sound in the office of the conference, and if so, renegotiate the SDP content, and switch the RTP to other mixing UA users in the conference. If the media server can not find the mixing UA user in the station, or fails to negotiate with the new mixing UA user SDP, the conference server will fill the SDP content in the media information of the server, so that the media stream of the UA client is automatically switched from UA2 to the server of the public network.
In addition, at this time, the conference server may also make a query once again to see whether there is another UA device for mixing sound, and if there is another UA device, read the SDP of this device, otherwise, this SDP is the own supportable media information of the conference server.
Fig. 5 is a second networking diagram of implementing an intra-office mixing conference mode according to a specific embodiment of the present invention. At this time, among the conference users of the teleconference, the conference users include both UA users in the local area network and UA users in the non-local area network, the UA device mixes other UA users in the office, and then sends the RTP stream to the conference server after the completion, and after receiving the RTP stream, the conference server mixes and forwards the mixed RTP stream to other UA users in the conference place, and the other UA users in the office need to be excluded. And for the UA users in the bureau, the mixed RTP stream is transferred to the UA equipment, and then the UA equipment transfers the RTP stream to the UA users in each bureau.
As a third specific embodiment of the present invention, a UA device with a mixing capability in an authority can forward RTP streams to other users without mixing UA in the authority without a conference.
When a UA user initiates a call INVITE to enter a conference, a conference server first searches whether a UA user with audio mixing exists in the call account office of a database, and the conference server modifies an SDP signaling into a media capability of audio mixing UA devices in the UA office in a replied SDP of a 200OK zone, including an IP, a port, and the media capability, that is, SDP information is all information of the audio mixing UA devices. After the negotiation is successful, namely the conference server receives 200OK, the conference server checks the UA equipment, if the conference is not in the conference, a private message can be sent to the UA equipment, the audio mixing equipment automatically generates a Channel to be bridged to the conference server of the public network, and after the UA user sends the RTP stream to the audio mixing UA equipment, the audio mixing UA equipment uses the bridged Channel to relay the RTP stream to the conference server of the public network. When the mixed UA equipment generates a call, the SIP signaling and the negotiation of the public network conference server are generated again, and RTP is sent, so that the phenomenon that the Channel bridged before relays RTP flows for other UAs is not influenced.
In addition, the RTP stream may be audio or video, and if the RTP stream is audio, the UA2 is an audio stream for mixing other UA devices; if the video stream is the video stream, the UA2 re-decodes the video stream of other UA users according to the negotiated SDP content, re-encodes the video stream into a video stream, and sends the video stream to the conference server.
Fig. 6 is a functional block diagram of a conferencing server and a UA in accordance with an embodiment of the present invention. As can be seen from the figure, in order to implement the intra-office audio mixing conference mode of the present invention, the related conference server mainly includes the following functional modules: the system comprises a media capability database, a network service module, an in-office media processing control module, a sound mixing processing module, a frequency mixing processing module and an SIP communication control module.
The network service module is responsible for reading a media capability data table from the registered and connected UA user and generating the media capability database by the conference server. Because the reading and recording function of the network service module is not the SIP standard function, in order to realize the function, a switch can be arranged on the conference server to control whether the function is started or not.
And the media capability database is used for recording and sorting the UA user media capability data table read by the network service module to form a media capability database of the conference server and used as a judgment and query basis for judging whether to start an intra-office audio mixing conference mode during subsequent conference calling.
The in-office media processing control module analyzes according to the SIP account number of the UA user of the current conference call and the information of the media capability database, and can start an in-office audio mixing conference mode when the UA equipment with the audio mixing function in the local area network of the UA user is searched. And further, the SDP information of the 200OK is modified to be UA equipment, and the transmission and the processing of the voice and/or video data of the UA user are closed. Otherwise, under the ordinary conference mode, controlling the audio mixing processing module and the frequency mixing processing module according to the prior art, and establishing a voice and/or video processing channel with the UA user.
And the SIP communication control module is used for controlling and taking over the conference call request of the UA user to the conference server and is used for the communication and analysis processing of SIP signaling in the whole conference process.
And the audio mixing processing module and the frequency mixing processing module are respectively used for mixing the received audio stream and the received video stream.
In the UA client, the following functional units are mainly included: the system comprises a media capability data table, a network data transmission unit, a media transmission control unit, an audio processing unit, a video processing unit and an SIP communication unit.
The media capability data table includes SIP accounts and corresponding media capability information of all other UA users and UA devices in the UA user SIP account bureau. The data is that other UA users carry their own media capability information when starting and closing, and other UA users and UA devices in the broadcast station.
And the media transmission control unit is used for controlling the transmission flow direction of the UA user multimedia data, cooperating with the network data transmission unit when the called conference enters an in-office audio mixing conference mode, and sending the RTP flow of the audio and video data to the UA equipment end in the local area network according to the modified SDP information of the conference server, wherein in the ordinary conference mode, the audio and video data of the UA user are directly sent to the conference server for processing.
And the SIP communication unit is used for carrying out SIP signaling communication with an SIP communication control module of the conference server.
The audio unit and the video unit are respectively used for coding and decoding the local audio and video.
At the UA device end, its internal functional units are basically consistent with the UA users, the only difference is that the UA devices have stronger multimedia capability, and can perform audio mixing and/or frequency mixing processing on the audio/video RTP stream of the local area network. Therefore, the UA device has a mixing unit and a mixing unit corresponding to each other.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A multimedia processing method for telephone conference is characterized in that a telephone conference system comprises at least one UA device with multimedia mixed processing capability and a plurality of conference terminal UA users, the UA device can interact with a conference server for media stream in a local area, the multimedia processing method mainly comprises the following steps:
step a, the UA user initiates a call to enter a telephone conference;
b, the conference server inquires a media capability database stored in the database and judges whether the UA equipment with multimedia hybrid processing capability exists in a local area network N of the UA user account;
if the judgment result of the step b is yes, starting an intra-office mixed-sound conference mode, and if the judgment result of the step b is no, starting a common conference mode, namely, carrying out multimedia mixing processing by the conference server;
the intra-office mixing conference mode includes: the conference server modifies SDP information of SIP signaling into the UA equipment, the UA user transfers RTP stream to be sent to the UA equipment, and the UA equipment carries out first multimedia mixing processing, namely mixing sound and/or mixing frequency processing to generate an in-office mixing RTP stream;
when the UA user and the UA equipment are started or quit, carrying media capability information in a broadcast signaling in the local area network N, and recording the media capability information and an SIP account number of the UA user by other UA users in the local area network N to generate a media capability data table;
when the UA user and the UA equipment are respectively registered to the conference server at intervals, the conference server additionally carries other SIP accounts and a list of corresponding media capability information in the local area network N in an SIP registration signaling, reads the media capability and the SIP accounts and stores the media capability and the SIP accounts in a database to generate a media capability database;
when the UA device exits the conference, further comprising the steps of: judging whether other UA equipment with multimedia hybrid processing capability exists in the local area network N in the conference; if the other UA equipment exists, the SDP content is renegotiated, and the other UA equipment performs sound mixing and/or frequency mixing processing in the subsequent conference process; if the other UA equipment does not exist or the SDP negotiation with the other UA equipment fails, the conference server fills the media information of the conference server in the SDP content and reenters the ordinary conference mode.
2. The multimedia processing method according to claim 1, wherein if the conference includes both UA users of non-lan N, the multimedia processing method further comprises a second multimedia mixing process for generating a conference mixed RTP stream, i.e. a mixing process of the in-office mixed RTP stream and the media stream of UA users in non-lan N is performed by the conference server; the conference mixed RTP stream may be forwarded by the UA device to a UA user of the local area network N.
3. The multimedia processing method according to claim 2, wherein in the intra-office mixing conference mode, the conference server determines whether the UA user and the UA device belong to the same conference; if not, the conference server sends a private message to the UA device to enable the UA device to automatically generate a bridge to the conference server, and when the UA user sends the RTP stream to the UA device, the UA device uses the bridge to relay the RTP stream to the conference server.
4. Multimedia processing method according to claim 3, characterized in that said RTP streams comprise audio and/or video data.
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| CN107682381A (en) * | 2017-11-22 | 2018-02-09 | 云智汇（深圳）高新科技服务有限公司 | Multipartite voice conference system and method |
| CN111314338B (en) * | 2020-02-11 | 2022-09-23 | 烽火通信科技股份有限公司 | Method and device for realizing distributed local sound mixing |
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| CN101471804A (en) * | 2007-12-28 | 2009-07-01 | 华为技术有限公司 | Method, system and control server for processing audio |
| CN101682617A (en) * | 2007-05-11 | 2010-03-24 | 艾利森电话股份有限公司 | Group call capability query |
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| CN103916823A (en) * | 2012-12-31 | 2014-07-09 | 中国移动通信集团公司 | Method and apparatus for creating mobile conference call |
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| CN101682617A (en) * | 2007-05-11 | 2010-03-24 | 艾利森电话股份有限公司 | Group call capability query |
| CN101471804A (en) * | 2007-12-28 | 2009-07-01 | 华为技术有限公司 | Method, system and control server for processing audio |
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