WO2020119229A1 - 电子白板的控制方法、移动终端及电子白板系统 - Google Patents

电子白板的控制方法、移动终端及电子白板系统 Download PDF

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Publication number
WO2020119229A1
WO2020119229A1 PCT/CN2019/109604 CN2019109604W WO2020119229A1 WO 2020119229 A1 WO2020119229 A1 WO 2020119229A1 CN 2019109604 W CN2019109604 W CN 2019109604W WO 2020119229 A1 WO2020119229 A1 WO 2020119229A1
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Prior art keywords
whiteboard
video
operation data
media server
initiator
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PCT/CN2019/109604
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English (en)
French (fr)
Inventor
魏学松
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中兴通讯股份有限公司
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Publication of WO2020119229A1 publication Critical patent/WO2020119229A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/15—Conference systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H04L65/401—Support for services or applications wherein the services involve a main real-time session and one or more additional parallel real-time or time sensitive sessions, e.g. white board sharing or spawning of a subconference
    • H04L65/4015—Support for services or applications wherein the services involve a main real-time session and one or more additional parallel real-time or time sensitive sessions, e.g. white board sharing or spawning of a subconference where at least one of the additional parallel sessions is real time or time sensitive, e.g. white board sharing, collaboration or spawning of a subconference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643—Communication protocols
    • H04N21/6437—Real-time Transport Protocol [RTP]

Definitions

  • the invention belongs to the field of mobile communication, and in particular relates to an electronic whiteboard control method, a mobile terminal and an electronic whiteboard system in a multi-party video service of a mobile terminal.
  • the RCS service which is Rich Communication Suite integrated communication service, refers to the integration of the three main entrances of "call”, “message”, and “contact” in the mobile phone from the operator's level directly into the mobile phone to become a new call , New news, new contacts.
  • Converged communication solutions help operators to take advantage of telecommunications network communications and build a business of Internet ICT converged communication networks with the user social relationship database as the core; by opening up the ability of cooperative and integrated communications to Internet manufacturers and enterprises, integrating existing VoIP, Instant messaging pipelines to converged communication networks, where multi-party call services and multi-party video services are important services in RCS services.
  • the embodiments of the present invention provide an electronic whiteboard control method, a mobile terminal, and an electronic whiteboard system, which are used to solve the problem that the electronic whiteboard cannot meet the real-time requirements in multi-party video services in some situations, resulting in a poor user experience The problem.
  • the first aspect of the present invention provides an electronic whiteboard control method, which includes: collecting electronic whiteboard operation data; synthesizing the whiteboard operation data into a video picture; and transmitting the video picture to a multi-party video The other members of the business.
  • an embodiment of the present invention also provides a mobile terminal, including: a collection module for collecting electronic whiteboard operation data; a video generation module for synthesizing the whiteboard operation data into a video picture; a transmission module for In order to transfer the video picture to other members in the multi-party video service.
  • an embodiment of the present invention also provides an electronic whiteboard system, including: a media server for forwarding the whiteboard operation data to the initiating end; an initiating end for collecting the local whiteboard operation Operation data; used to receive the whiteboard operation data; used to synthesize the whiteboard operation data into a video picture; used to pass the video picture to other members in the multi-party video service; other than the initiator
  • the member end is used to collect the operation data of the whiteboard operation at the local end and send the operation data of the whiteboard to the media server.
  • FIG. 1 is a schematic flowchart of a first embodiment of the electronic whiteboard control method of the present invention
  • FIG. 2 is a schematic flow chart of collecting operation data of an electronic whiteboard according to a first embodiment of the electronic whiteboard control method of the present invention
  • FIG. 3 is a schematic flowchart of initiating an electronic whiteboard operation according to a second embodiment of the electronic whiteboard control method of the present invention.
  • FIG. 4 is a schematic diagram of sending a message for initiating successful operation of an electronic whiteboard according to a second embodiment of the electronic whiteboard control method of the present invention
  • FIG. 5 is a schematic diagram of sending a message for initiating an operation failure of the electronic whiteboard according to the second embodiment of the electronic whiteboard control method of the present invention
  • FIG. 6 is a schematic flowchart of a whiteboard operation of a second embodiment of the electronic whiteboard control method of the present invention.
  • FIG. 7 is a schematic diagram of sending a message for initiating a whiteboard operation in a second embodiment of the electronic whiteboard control method of the present invention.
  • FIG. 8 is a schematic diagram of message transmission for other members to start the whiteboard operation in the second embodiment of the electronic whiteboard control method of the present invention.
  • FIG. 10 is a schematic diagram of message transmission for whiteboard release according to the second embodiment of the electronic whiteboard control method of the present invention.
  • FIG. 11 is a schematic structural diagram of a mobile terminal according to a third embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of an electronic whiteboard system according to a fourth embodiment of the present invention.
  • VoIP Voice Over Internet Protocol Voice Call
  • IP phone IP phone
  • TBCP (Talk Burst Control Protocol Control Protocol): is a protocol defined by OMA, which can be used to achieve the distribution of PoC media streams and control of the right to speak.
  • SIP Session Initiation Protocol, Session Initiation Protocol
  • IETF Internet Engineering Task Force, Internet Engineering Task Force
  • It is a text-based application layer control protocol used to create, modify, and release one or more participants' sessions.
  • ICT Information and Communication Technology
  • RTP Real-time Transport Protocol Real-time Transport Protocol: is a transport protocol for multimedia data streams on the Internet, published by IETF (Internet Engineering Task Force) as RFC1889.
  • RTP itself only guarantees the transmission of real-time data, and cannot provide a reliable transmission mechanism for sequentially transmitting data packets, nor does it provide flow control or congestion control. It relies on RTCP to provide these services.
  • RTCP Real-time Transport Control Protocol real-time transmission control protocol: responsible for managing transmission quality and exchanging control information between current application processes.
  • RCS ich Communication Communication: refers to the three main entrances of the original "call”, “message” and “contact” in the mobile phone, from the operator's level directly integrated with the mobile phone, into a new call, new News, new contacts.
  • MS Media Server Media Server
  • the device under the control of the control device (softswitch device, application server), provides media resource functions needed to implement various services on the IP network, including service tone provision, conference, interactive response (IVR), notification, and unified Messages, advanced voice services, etc.
  • the first embodiment of the present invention provides an electronic whiteboard control method. As shown in FIG. 1, the method includes the following steps.
  • step S10 the operation data of the electronic whiteboard is collected.
  • operations performed by the user on the electronic whiteboard include, but are not limited to, line drawing operations, erasing operations, etc., where line drawing operations include, but are not limited to, operations such as drawing lines, curves, and points.
  • the client APP collects the user's operation data on the local electronic whiteboard.
  • the operation data can be expressed as dot matrix data.
  • the dot matrix data is the position of the composition point of the drawn line in the whiteboard coordinate interval Data, at this time, the dot matrix data is used as the operation data of the line drawing operation.
  • step S10 of the client APP collecting the operation data of the electronic whiteboard includes the following steps.
  • step S101 operation data for whiteboard operation is collected.
  • the dot matrix data of the whiteboard operation is position data of the composition points of the drawn lines in the dot matrix interval of the whiteboard when the user operates the whiteboard, for example, when drawing a line.
  • a data link table for whiteboard operation When the user performs line drawing operations on the electronic whiteboard, the client APP records the position data of each component point of the line drawn into the data link table.
  • the data link table can also record the distinction Different lines, different fonts and different operation data.
  • the data linked list is updated and transmitted once. After the receiver receives the data linked list, the data is restored. , And redraw the data, so that the data of the user’s whiteboard operation can be restored in real time.
  • This method can not only transmit the user's whiteboard operation data in real time, but also greatly reduce the amount of data transmission.
  • step S102 it is determined whether the whiteboard operation is completed once.
  • one whiteboard operation can be a whiteboard operation within a preset time length, so that it can be judged whether a whiteboard operation is completed by judging the time length.
  • step S103 if so, the operation data collection of the whiteboard operation ends.
  • the operation data collection of the current whiteboard operation is ended.
  • step S104 if not, continue to collect the operation data of the whiteboard operation.
  • the coordinate position of the current composition point of the drawn line is continuously collected and recorded in the data link list.
  • step S11 the whiteboard operation data is synthesized into a video picture.
  • the whiteboard operation data is used to redraw the display screen of the electronic whiteboard to obtain a video image of the synthetic whiteboard operation.
  • the collected whiteboard operation data is used to redraw the display screen of the electronic whiteboard, so that a video picture of the whiteboard operation process can be generated in real time, for example, a video picture of the line drawing process.
  • step S12 the video picture is delivered to other members in the multi-party video service.
  • the video image of the synthetic whiteboard operation is uploaded to the server, and the server side forwards the video image of the synthetic whiteboard operation to the other members, so that the users of each member can watch the other users in real time.
  • the operation on the electronic whiteboard shares the operation process of the electronic whiteboard.
  • the second embodiment of the present invention provides an electronic whiteboard control method, which can be applied to multi-party video services, where multiple participating mobile terminals are used as member terminals to control and interact with the media server to realize the member terminal The operation process of sharing electronic whiteboard in multi-party video conference.
  • the member terminals participating in the conference include an initiator terminal of the whiteboard service and other member terminals, and the initiator terminal and the other member terminals operate the electronic whiteboard of the local terminal to realize the shared electronic whiteboard operation.
  • the operations performed by the user on the electronic whiteboard include, but are not limited to, line drawing operations, erasing operations, etc., wherein the line drawing operations include, but are not limited to, operations such as drawing lines, curves, and points.
  • the RTCP protocol data source description data packet SDES can be used to define the whiteboard control and operation messages, and the member end can share the operation process of the electronic whiteboard in the multi-party video conference, including: control right application message (TB_request ), authorization message (TB_granted), occupied notification message (TB_taken), application rejection message (TB_deny), control release application message (TB_release), control release notification message (TB_released), message response (TB_Reply), operation instruction ( TB_operational order) etc.
  • control right application message (TB_request ), authorization message (TB_granted), occupied notification message (TB_taken), application rejection message (TB_deny), control release application message (TB_release), control release notification message (TB_released), message response (TB_Reply), operation instruction ( TB_operational order) etc.
  • the method includes the following steps.
  • step S201 the initiating end applies to the media server to initiate an electronic whiteboard operation.
  • the multi-party video service is initiated first. After entering the multi-party video service, all participating members including the chairperson and members can initiate electronic whiteboard operations. Assuming that member A initiates the electronic whiteboard business, member A As the initiator, the TB_request message must be sent to the media server through the RTCP protocol to apply for control of the electronic whiteboard.
  • step S202 the media server determines whether the control right of the electronic whiteboard is in an idle state.
  • step S203 if it is, the media server authorizes the initiator and sets the control of the electronic whiteboard to the whiteboard state, notifying all the members of the conference that the control has been occupied; the initiator starts to send media to the media after receiving the authorization information
  • the server uploads the video stream; the media server puts the upstream video process of the application end on the first stream and forwards it to each member end, while suppressing the sound excitation mode; the other member ends switch to the electronic whiteboard interface after receiving the message that the control right has been occupied To display the first video stream.
  • the media server judges whether the control right of the current electronic whiteboard is idle, and if available, sends a TB_granted message to the member terminal A to authorize the control right of the whiteboard to Apply for terminal A, and send a TB_taken message to other members to notify other members: the control of the whiteboard has been taken, please do not apply again.
  • the other members After receiving the notification, the other members return a message response TB_Reply to the media server, indicating that they have received the notification message, and will automatically switch to the electronic whiteboard interface and enter the electronic whiteboard operation mode.
  • the initiator After receiving the authorization message, the initiator starts to upload the video stream to the media server; the media server first puts the upstream video process of the initiator on the first stream and forwards it to each member, while suppressing the sound excitation mode (sound excitation is in multi-party video , Will put the loudest stream in the first channel to pass), so as to ensure that the first stream is the video flow of the initiator of the electronic whiteboard.
  • the first video stream received is the video stream of the initiating end. At this time, only the first video stream is displayed, and the large screen is displayed, and the other video streams behind are not displayed. .
  • the video stream uploaded by the initiator is transferred according to the RTP protocol.
  • step S204 if not, the media server rejects the whiteboard initiation request.
  • each member end may still erroneously apply for control of the electronic whiteboard. Problem, and the authorization response is not received, so the application continues, the media server will send the authorization response TB_granted to the original application again. If it is an application from another member, the media server will send a refusal response TB_deny to the member, rejecting other members End application.
  • Step S21 is performed when the initiator performs whiteboard operations
  • step S22 is performed when other members perform whiteboard operations.
  • the method further includes the following steps.
  • step S21 when the initiating end performs the whiteboard operation, the initiating end collects operation data of the whiteboard operation at the local end.
  • the screen synthesis operation is performed directly on the local end without sending the collected operation data to the media server.
  • step S22 when the other member ends except the initiator end perform the whiteboard operation, the other member end collects the whiteboard operation data of the local end, and sends the whiteboard operation data to the media server; the media The server forwards the whiteboard operation data to the initiator; the initiator receives the whiteboard operation data.
  • the collected operation data needs to be sent to the media server end.
  • the other members who perform the whiteboard operation send a message carrying the operation instruction (TB_operational) of the whiteboard operation data to the media server through the RTCP protocol.
  • the media server receives the operation instruction (TB_operational order) message and forwards the RTCP request message to the initiator according to the RTCP protocol.
  • the whiteboard operation data is received by the initiator.
  • step S23 the initiator side synthesizes the whiteboard operation data into a video picture.
  • the action of reverting the operation data of the whiteboard operation to the whiteboard operation by the initiating end is redrawn on the most recent video screen generated by the initiating end, thereby generating the video image of the whiteboard operation.
  • the initiator after receiving the operation instruction (TB_operational order) message, the initiator will restore the whiteboard operation according to the whiteboard operation data carried in the message, and redraw the generated whiteboard operation data based on the restored whiteboard operation data
  • the display screen of the electronic whiteboard after this operation is synthesized, so that the video screen of the whiteboard operation process can be generated in real time, such as the video screen of the line drawing process.
  • step S24 the initiator transmits the video picture to other members in the multi-party video service.
  • the initiator transmits the video image to the media server through an upstream video process; the media server transmits the video image to the first downstream video stream of other member terminals except the initiator .
  • the initiator transmits the synthesized video image to the media server according to the RTP protocol.
  • the media server forwards the video image to the first downstream video stream of each user terminal according to the RTP protocol.
  • the initiator when the initiator requests the server to end the whiteboard service, it further includes the following steps.
  • step S25 the initiator requests the media server to end the whiteboard service.
  • step S26 the media server ends the whiteboard request to the server according to the originating end, sets the control right of the whiteboard to an idle state, and issues an electronic whiteboard release notification message to other member ends.
  • step S27 the other member end releases the electronic whiteboard interface of the local end after receiving the notification message of the electronic whiteboard release.
  • the initiator sends a control right release application message (TB_release) to the media server.
  • the media server sets the control of the whiteboard to the idle state and sends it to the other
  • the member terminal issues the release notification message (TB_released) of the electronic whiteboard, and the other member terminals release the local whiteboard interface after receiving the notification message of the release of the electronic whiteboard.
  • the third embodiment of the present invention provides a mobile terminal, where the mobile terminal may be a mobile phone, a tablet computer, an MP3, MP4, or a notebook computer.
  • FIG. 11 is a schematic structural diagram of the mobile terminal, which is used to implement the electronic whiteboard control method in the first embodiment.
  • the mobile terminal 300 includes an acquisition module 310, a video generation module 320, and a transmission module 330.
  • the collection module 310 is connected to the video generation module 320 and is used to collect operation data of the electronic whiteboard.
  • the collection module 310 is specifically configured to: collect operation data of the whiteboard operation; determine whether to complete the whiteboard operation once; if yes, end collecting operation data of the whiteboard operation; if not, continue collecting operation data of the whiteboard operation.
  • the video generation module 320 is respectively connected to the collection module 310 and the transmission module 330, and is used to synthesize the whiteboard operation data into a video screen.
  • the video generation module 320 is specifically configured to: redraw the display screen of the electronic whiteboard with the whiteboard operation data to obtain a video image of the synthetic whiteboard operation.
  • the transmission module 330 is connected to the video generation module 320, and is used to transfer the video image to other members in the multi-party video service.
  • FIG. 12 is a schematic structural diagram of the electronic whiteboard system, which is used to implement the electronic whiteboard control method in the second embodiment.
  • the electronic whiteboard system 400 includes a media server 410, an initiator 420, and other member terminals 430.
  • the media server 410 is connected to the initiator 420 and other member terminals 430 respectively.
  • a media server 410 configured to forward the whiteboard operation data to the initiator
  • the initiating terminal 420 is used to collect the operation data of the whiteboard operation at the local end; to receive the whiteboard operation data; to synthesize the whiteboard operation data into a video picture; to transmit the video picture to multiple parties Other members of the video service;
  • the other member terminal 430 is used to collect the operation data of the whiteboard operation at the local end, and send the whiteboard operation data to the media server.
  • the electronic whiteboard system used in the multi-party video service provided by the embodiments of the present invention is suitable for people who participate in multi-party video conferences to use their mobile terminals to interact or graffiti on the same electronic whiteboard together in the program discussion session to achieve The interactive result display of the fast process.
  • the embodiment of the present invention is applied to a multi-party video service, and various control operations of the control right of the electronic whiteboard are performed through the RTCP protocol, including: any member end can be used as an initiator to initiate the electronic whiteboard operation, and the media server controls the electronic whiteboard The power state is authorized or rejected by the initiating end.
  • the member end collects interactive whiteboard data in the form of dot matrix data , Transfer the dot matrix data to the initiator through the media server, and the initiator synthesizes the dot matrix data interacted with the whiteboard into a video screen, and then transmits the video screen synthesized by the initiator to each member through the media server, so as to realize the various items of the electronic whiteboard Function
  • the embodiment of the present invention interacts with the electronic whiteboard through the media surface, which can improve the response speed of the electronic whiteboard, at the same time, it is better to complete data synthesis, realize smoother sharing of the electronic whiteboard operation, and achieve a smoother interaction of the electronic whiteboard.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a division of logical functions.
  • there may be other divisions for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above integrated unit may be implemented in the form of hardware or software functional unit.
  • the program may be stored in a computer-readable storage medium, and the storage medium may include: Read only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, etc.
  • the medium may be read-only memory, magnetic disk, or optical disk.

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  • Multimedia (AREA)
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  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

本发明涉及移动通信领域，公开了一种移动终端的多方视频业务中的电子白板控制方法、移动终端及电子白板系统，包括：采集电子白板操作数据；将所述白板操作数据合成为视频画面；将所述视频画面传递到在多方视频业务中其他成员端。

Description

电子白板的控制方法、移动终端及电子白板系统
交叉引用
本发明要求在2018年12月11日提交中国专利局、申请号为201811513467.0、发明名称为“电子白板控制方法、移动终端及电子白板系统”的中国专利申请的优先权，该申请的全部内容通过引用结合在本发明中。
技术领域
本发明属于移动通信领域，具体涉及一种移动终端的多方视频业务中的电子白板控制方法、移动终端及电子白板系统。
背景技术
RCS业务，即Rich Communication Suite融合通信业务，是指把手机中原有的“通话”、“消息”、“联系人”这3个主要入口，从运营商的层面直接与手机整合，变为新通话、新消息、新联系。融合通信解决方案帮助运营商借助电信网络通信的优势，以用户社会关系库为核心，打造互联网ICT融合通信网络的业务；通过向互联网厂家、企业开放合作融合通信的能力，整合现有的VoIP、即时通信管道到融合通信网络，其中多方通话业务和多方视频业务，是RCS业务中重要的业务，在多方视频业务中，主要实现的语音和视频的沟通和交互，但是在端侧上有时候还需要进行白板共享也即大家共同在端侧上面进行方案的讨论操作，该过程就是共享电子白板操作的过程，在一些情形下，共享电子白板操作一般采用的是SIP协议中的info信息进行信息相互的交互，这个信息相互的交互过程会涉及的多个网元，通过信令面进行操作，因为通过的网元比较多，所以无法满足实时性的需求，导致用户体验比较差。
发明内容
有鉴于此，本发明实施例提供了一种电子白板控制方法、移动终端及电子白板系统，用于解决在一些情形下在多方视频业务中电子白板无法满足实时性的需求，导致用户体验比较差的问题。
为了解决上述技术问题，第一方面本发明实施例提供一种电子白板控制方法，包括：采集电子白板操作数据；将所述白板操作数据合成为视频画面；将所述视频画面传递到在多方视频业务中其他成员端。
第二方面，本发明实施例还提供了一种移动终端，包括：采集模块，用于采集电子白板操作数据；视频生成模块，用于将所述白板操作数据合成为视频画面；传输模块，用于将所述视频画面传递到在多方视频业务中其他成员端。
第三方面，本发明实施例还提供了一种电子白板系统，包括：媒体服务器，用于将所述白板操作数据转发给所述发起端；发起端，用于采集本端的所述白板操作的操作数据；用于接收所述白板操作数据；用于将所述白板操作数据合成为视频画面；用于将所述视频画面传递到在多方视频业务中其他成员端；除发起端之外的其它成员端，用于采集本端的所述白板操作的操作数据，并向媒体服务器发送白板操作数据。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明电子白板控制方法的第一实施例的流程示意图；
图2是本发明电子白板控制方法的第一实施例的采集电子白板操作数据 的流程示意图；
图3是本发明电子白板控制方法的第二实施例的发起电子白板操作的流程示意图；
图4是本发明电子白板控制方法的第二实施例的发起电子白板操作成功的消息发送示意图；
图5是本发明电子白板控制方法的第二实施例的发起电子白板操作成失败的消息发送示意图；
图6是本发明电子白板控制方法的第二实施例的白板操作的流程示意图；
图7是本发明电子白板控制方法的第二实施例的发起端白板操作的消息发送示意图；
图8是本发明电子白板控制方法的第二实施例的其他成员起端白板操作的消息发送示意图；
图9是本发明电子白板控制方法的第二实施例的白板释放的流程示意图；
图10是本发明电子白板控制方法的第二实施例的白板释放的消息发送示意图；
图11是本发明第三实施例的一种移动终端的结构示意图；
图12是本发明第四实施例的一种电子白板系统的结构示意图。
具体实施方式
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。
在本发明的说明书和权利要求书及上述附图中的描述的一些流程中，包含了按照特定顺序出现的多个操作，但是应该清楚了解，这些操作可以不按照其在本文中出现的顺序来执行或并行执行，操作的序号如101、102等，仅 仅是用于区分开各个不同的操作，序号本身不代表任何的执行顺序。另外，这些流程可以包括更多或更少的操作，并且这些操作可以按顺序执行或并行执行。需要说明的是，本文中的“第一”、“第二”等描述，是用于区分不同的消息、设备、模块等，不代表先后顺序，也不限定“第一”和“第二”是不同的类型。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
名词解释：
VoIP(Voice over Internet Protocol网络语音电话)：将模拟的声音讯号引经过压缩与封包之后，以数据封包的形式在IP网络进行语音讯号的传输，通俗来说也就是互联网电话或IP电话。
TBCP(Talk Burst Control Protocol会话控制协议)：是由OMA定义的协议，可用于实现PoC媒体流的分发和发言权的控制。
SIP(Session Initiation Protocol，会话发起协议)：是由IETF(Internet Engineering Task Force，因特网工程任务组)制定的IP电话信令协议。它是一个基于文本的应用层控制协议，用于创建、修改和释放一个或多个参与者的会话。
ICT(Information and Communication Technology即信息和通信技术)：是信息技术与通信技术相融合而形成的一个新的概念和新的技术领域。
RTP(Real-time Transport Protocol实时传输协议)：是针对Internet上多媒体数据流的一个传输协议,由IETF(Internet工程任务组)作为RFC1889发布。RTP本身只保证实时数据的传输，并不能为按顺序传送数据包提供可靠的传送机制，也不提供流量控制或拥塞控制，它依靠RTCP提供这些服务。
RTCP(Real-time Transport Control Protocol实时传输控制协议)：负责管理传输质量在当前应用进程之间交换控制信息。
RCS(Rich Communication Suite融合通信)：是指把手机中原有的“通话”、“消息”、“联系人”这3个主要入口，从运营商的层面直接与手机整合，变为新通话、新消息、新联系。
MS(Media Server媒体服务器)：是下一代网络的重要设备。该设备在控制设备(软交换设备、应用服务器)的控制下，提供在IP网络上实现各种业务所需的媒体资源功能，包括业务音提供、会议、交互式应答(IVR)、通知、统一消息、高级语音业务等。
本发明第一实施例提供了一种电子白板控制方法，如图1所示，该方法包括以下步骤。
在步骤S10中，采集电子白板操作数据。
在本实施例中，用户对电子白板进行的操作，包括但不限于画线操作、擦除操作等，其中画线操作包括但不限于画直线、曲线，点等操作。
客户端APP采集用户对本端的电子白板的操作数据，该操作数据可以以点阵数据表示，例如用户在电子白板上画线时，该点阵数据为所画线的组成点在白板坐标区间的位置数据，此时用该点阵数据作为画线操作的操作数据。
如图2所示，客户端APP采集电子白板操作数据的步骤S10包括以下步骤。
在步骤S101中，采集白板操作的操作数据。
在本实施例中，白板操作的点阵数据是用户在操作白板时例如画线时，所画线的组成点在白板点阵区间的位置数据。首先为白板操作建立一个数据链表，当用户在电子白板上进行画线操作时，客户端APP将所画线的各组成点的位置数据记录到该数据链表中，另外该数据链表还可记录区分不同的线条、不同的字体及不同的操作的数据。通过这个链表的数据结构，可以还原 操作者在电子白板进行何种操作，当操作者进行完一次操作的时候，其数据链表更新并传输一次，接收者接收到数据链表后，对这些数据进行还原，并重绘数据，这样就可以实时还原用户的白板操作的数据。该方式不仅可以实时地传输用户的白板操作数据，还可以大大减少数据的传输量。
在步骤S102中，判断是否完成一次白板操作。
在本实施例中，一次白板操作可以为预设时间长度内的白板操作，这样可以通过判断时间长度来判断是否完成一次白板操作。
在步骤S103中，若是，则结束采集所述白板操作的操作数据。
在本实施例中，如果达到预设时间长度，则结束采集本次白板操作的操作数据。
在步骤S104中，若否，则继续采集所述白板操作的操作数据。
在本实施例中，如果没有达到预设时间长度，则继续采集所画线的当前组成点的坐标位置并记录到该数据链表中。
在步骤S11中，将所述白板操作数据合成为视频画面。
进一步，用所述白板操作数据重绘电子白板的显示画面，得到合成白板操作的视频画面。
在本实施例中，用所采集的白板操作数据重绘电子白板的显示画面，这样就可以实时生成白板操作过程的视频画面，例如画线过程的视频画面。
用所采集的白板操作的点阵数据，在本次操作前的时间最接近的电子白板的显示画面基础上重绘电子白板的显示画面，生成合成本次操作后的电子白板的显示画面，这样就可以实时生成白板操作过程的视频画面，例如画线过程的视频画面。
在步骤S12中，将所述视频画面传递到在多方视频业务中其他成员端。
在本实施例中，将合成白板操作的视频画面上传到服务器端，并由该服务器端将合成白板操作的视频画面传转发其他各成员端，从而各成员端的用户都可以实时观看到其他用户在电子白板上的操作，共享电子白板的操作过 程。
本发明第二实施例提供了一种电子白板控制方法，该方法可以应用于多方视频业务中，由多个参会的移动端作为成员端与媒体服务器之间进行控制及交互，以实现成员端在多方视频会议中共享电子白板的操作过程。
在本实施例中，参会的成员端包括白板业务的发起端和其它成员端，所述发起端和其它成员端操作本端的电子白板实现共享电子白板操作。
用户对电子白板进行的操作，包括但不限于画线操作、擦除操作等，其中画线操作包括但不限于画直线、曲线，点等操作。
成员端与媒体服务器之间可以采用RTCP协议的数据源描述数据包SDES来定义白板控制及操作的消息，实现成员端在多方视频会议中共享电子白板的操作过程，包括：控制权申请消息(TB_request)、授权消息(TB_granted)、已占用通知消息(TB_taken)、拒绝申请消息(TB_deny)、控制权释放申请消息(TB_release)、控制权释放通知消息(TB_released)、消息应答(TB_Reply)、操作指令(TB_operational order)等。
如图3所示，该方法包括以下步骤。
在步骤S201中，发起端向媒体服务器申请发起电子白板操作。
在本实施例中，首先发起多方视频业务，进入多方视频业务后，所有参会的成员端包括主席和成员，都可以发起电子白板操作，假设成员端A发起电子白板业务，则成员端A称为发起端，首先要通过RTCP协议向媒体服务器发送TB_request消息，以申请电子白板控制权。
在步骤S202中，媒体服务器判断电子白板的控制权是否为空闲状态。
在步骤S203中，若是，则媒体服务器授权给该发起端，并将电子白板的控制权设置为白板状态，通知入会的所有成员端控制权已经被占用；发起端收到授权信息后开始向媒体服务器上传视频流；媒体服务器把申请端的上行视频流程放在第一路流转发给各个成员端，同时抑制声音激励模式；其他成员端在收到控制权已经被占用的消息后切换到电子白板界面，显示第一路视 频流。
在本实施例中，如图4所示，媒体服务器收到请求后，判断当前电子白板的控制权是否空闲，如果空闲可用，则向成员端A发送TB_granted消息，以将白板的控制权授权给申请端A，同时向其他成员端发送TB_taken消息，以通知其他各个成员端：白板的控制权被拿走了，请不要再申请。
其他成员端收到通知后，向媒体服务器返回消息应答TB_Reply，表示收到通知消息，并会自动切换到电子白板界面，进入到电子白板操作模式。
发起端收到授权消息后开始向媒体服务器上传视频流；媒体服务器首先把发起端的上行视频流程放在第一路流转发给各个成员端，同时要抑制声音激励模式(声音激励是在多方视频中，会把声音最大的一路流放在第一路中传递)，这样保证第一路流是电子白板的发起端的视频流程。其他成员端在进入电子白板操作模式后，收到的第一路视频流即为发起端的视频流程，此时，只显示第一路视频流，而且大屏幕显示，后面的其它路视频流不显示。发起端上传的视频流按照RTP协议进行传递，其中在RTCP-SDES的name中填写“发起端号码:Sket”，向其他成员端表明其所接收到的视频流程为该发起端上传的白板操作视频流程。当新进入多方视频业务的成员端接收到该视频流程时，根据该name中填写的发起端号码:Sket”信息，会自动切换到电子白板界面，进入到电子白板操作模式。
在步骤S204中，若否，则媒体服务器拒绝白板发起请求。
在本实施例中，如图5所示，在进入电子白板操作模式后，即控制权不是空闲状态时，各个成员端可能还有申请电子白板控制权的误操作，如果是原发起端因为网路问题而没有收到授权响应，所以还在继续申请，则媒体服务器会再次向原申请端发送授权响应TB_granted，如果是其他成员端申请，则媒体服务器向该成员端发送拒绝响应TB_deny，拒绝其他成员端的申请。
在本实施例中，所有成员端都可以操作电子白板，当发起端进行白板操作时执行步骤S21，当其他成员端进行白板操作时执行步骤S22。如图6所 示，该方法还包括以下步骤。
在步骤S21中，当发起端进行白板操作时，由所述发起端采集本端的所述白板操作的操作数据。
在本实施例中，如图7所示，当发起端进行白板操作时，则直接在本端进行画面的合成操作，不需要向媒体服务端发送所采集的操作数据。
在步骤S22中，当所述除发起端之外的其它成员端进行白板操作时，由所述其它成员端采集本端的所述白板操作数据，并向媒体服务器发送白板操作数据；由所述媒体服务器将所述白板操作数据转发给所述发起端；由所述发起端接收所述白板操作数据。
在本实施例中，如图8所示，当所述除发起端之外的其它成员端进行白板操作时，需要向媒体服务端发送所采集的操作数据。
进行白板操作的其他成员端通过RTCP协议将携带白板操作数据的操作指令(TB_operational order)的消息发送到媒体服务器，其中SDES包的数据项定义为：PT＝204表明是自定义应用，name＝“Sket”表明是电子白板操作，subtype＝01010表明是电子白板操作指令，application dependent data携带xml格式的白板操作数据。
媒体服务器收到操作指令(TB_operational order)的消息，会将该RTCP请求消息按照RTCP协议转发到发起端。由所述发起端接收所述白板操作数据。
在步骤S23中，由所述发起端将所述白板操作数据合成为视频画面。
进一步，具体为：由所述发起端将本次白板操作的操作数据还原为白板操作的动作重绘在发起端生成的时间最近的视频画面上，从而生成本次白板操作的视频画面。
在本实施例中，发起端收到操作指令(TB_operational order)的消息后，会根据该消息携带的白板操作数据进行白板操作动作的还原，并且根据还原的白板操作数据重绘在发起端生成的时间最近的视频画面上，生成合成本次 操作后的电子白板的显示画面，这样就可以实时生成白板操作过程的视频画面，例如画线过程的视频画面。
在步骤S24中，由所述发起端将所述视频画面传递到在多方视频业务中其他成员端。
进一步，具体为：所述发起端通过上行视频流程将所述视频画面传递到所述媒体服务器；所述媒体服务器将视频画面传递到除发起端之外的其它成员端的第一路下行视频流中。
在本实施例中，发起端将合成好的视频画面按照RTP协议传递到媒体服务器。媒体服务器将该视频画面按照RTP协议转发到其他各用户端的第一路下行视频流中。
在本实施例中，如图9所示，当发起端向服务器请求结束白板业务时，进一步包括以下步骤。
在步骤S25中，发起端向媒体服务器请求结束白板业务。
在步骤S26中，媒体服务器根据发起端向服务器结束白板请求，将白板的控制权设置为空闲状态，向其他成员端下发电子白板释放通知信息。
在步骤S27中，其他成员端收到电子白板释放通知信息后释放本端的电子白板界面。
在本实施例中，如图10所示，发起端向媒体服务器发送控制权释放申请消息(TB_release)，媒体服务器收到控制权释放申请消息后将白板的控制权设置为空闲状态，并向其他成员端下发电子白板释放通知信息(TB_released)，其他成员端收到电子白板释放通知信息后释放本端的电子白板界面。
本发明第三实施例提供了一种移动终端，其中，移动终端可以是手机、平板电脑、MP3、MP4或笔记本电脑等。
如图11为该移动终端的结构示意图，用于实现的第一实施例中的电子白板控制方法。移动终端300包括采集模块310、视频生成模块320和传输模块330。
其中，采集模块310，与视频生成模块320连接，用于采集电子白板操作数据。
进一步，采集模块310具体用于：采集白板操作的操作数据；判断是否完成一次白板操作；若是，则结束采集所述白板操作的操作数据；若否，则继续采集所述白板操作的操作数据。
其中，视频生成模块320分别与采集模块310及传输模块330连接，用于将所述白板操作数据合成为视频画面。
进一步，视频生成模块320具体用于：用所述白板操作数据重绘电子白板的显示画面，得到合成白板操作的视频画面。
其中，传输模块330，与视频生成模块320连接，用于将所述视频画面传递到在多方视频业务中其他成员端。
本发明第四实施例提供了一种电子白板系统，如图12为电子白板系统的结构示意图，用于实现的第二实施例中的电子白板控制方法。电子白板系统400包括媒体服务器410、发起端420和其它成员端430。媒体服务器410分别与发起端420和其它成员端430连接。
媒体服务器410，用于将所述白板操作数据转发给所述发起端；
发起端420，用于采集本端的所述白板操作的操作数据；用于接收所述白板操作数据；用于将所述白板操作数据合成为视频画面；用于将所述视频画面传递到在多方视频业务中其他成员端；
其它成员端430，用于采集本端的所述白板操作的操作数据，并向媒体服务器发送白板操作数据。
本发明的实施例提供的应用于多方视频业务中的电子白板系统,适合在进行方案讨论环节中，参加多方视频会议的人员利用各自移动终端，共同在同一电子白板上进行交互或涂鸦，从而实现快速流程的交互结果展示。
在本发明的实施例应用于多方视频业务中，通过RTCP协议进行电子白板的控制权的各种控制操作，包括：任何成员端可以作为发起端发起电子白 板操作，由媒体服务器根据电子白板的控制权状态为发起端授权或拒绝，授权后通知入会的所有成员端切换到电子白板界面等操作；通过RTCP协议进行电子白板的交互操作，包括：成员端以点阵数据的形式采集电子白板交互数据，通过媒体服务器将点阵数据传递到发起端，发起端将白板交互的点阵数据合成视频画面，通过媒体服务器再把发起端合成的视频画面传递到各个成员端，从而实现电子白板的各项功能，本发明的实施例通过媒体面进行电子白板的交互，可以提高电子白板的响应速度，同时较好完成数据合成，实现较为流畅的共享电子白板操作，实现了比较流畅的电子白板交互效果。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存储介质中，存储介质可以包括：只读存储器(ROM，Read Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁盘或光盘等。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上对本发明所提供的一种用户设备进行了详细介绍，对于本领域的一般技术人员，依据本发明实施例的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (23)

  1. 一种电子白板控制方法，其中，包括：
    采集电子白板操作数据；
    将所述白板操作数据合成为视频画面；
    将所述视频画面传递到在多方视频业务中其他成员端。
  2. 根据权利要求1所述的方法，其中，所述采集电子白板操作数据，包括：
    采集白板操作的操作数据；
    判断是否完成一次白板操作；
    若是，则结束采集所述白板操作的操作数据；
    若否，则继续采集所述白板操作的操作数据。
  3. 根据权利要求1所述的方法，其中，所述将所述白板操作数据合成为视频画面包括：
    用所述白板操作数据重绘电子白板的显示画面，得到合成白板操作的视频画面。
  4. 根据权利要求1所述的方法，其中，所述多方视频业务中成员端包括白板业务的发起端和其它成员端，所述发起端和所述其它成员端操作本端的电子白板实现共享电子白板操作。
  5. 根据权利要求4所述的方法，其中，当所述发起端进行白板操作时，
    由所述发起端采集本端的所述白板操作的操作数据；
    由所述发起端将所述白板操作数据合成为视频画面；
    由所述发起端将所述视频画面传递到在多方视频业务中其他成员端。
  6. 根据权利要求5所述的方法，其中，当所述除发起端之外的其它成员端进行白板操作时，在由所述发起端将所述白板操作数据合成为视频画面之前的步骤替换为：
    由所述其它成员端采集本端的所述白板操作数据，并向媒体服务器发送白板操作数据；
    由所述媒体服务器将所述白板操作数据转发给所述发起端；
    由所述发起端接收所述白板操作数据。
  7. 根据权利要求5或6所述的方法，其中，所采集的所述白板操作数据为白板操作的点阵数据。
  8. 根据权利要求5或6所述的方法，其中，由所述发起端将所述白板操作数据合成为视频画面，包括：由所述发起端将本次白板操作的操作数据还原为白板操作的动作重绘在发起端生成的时间最近的视频画面上，从而生成本次白板操作的视频画面。
  9. 根据权利要求5或6所述的方法，其中，由所述发起端将所述视频画面传递到在多方视频业务中其他成员端，包括：
    所述发起端通过上行视频流程将所述视频画面传递到所述媒体服务器；
    所述媒体服务器将视频画面传递到除发起端之外的其它成员端的第一路下行视频流中。
  10. 根据权利要求5或6所述的方法，其中，所述成员端采集本端的所述白板操作数据前，所述方法还包括：
    发起端向媒体服务器申请发起电子白板操作；
    媒体服务器判断电子白板的控制权是否为空闲状态；
    若是，则媒体服务器授权给该发起端，并将电子白板的控制权设置为白板状态，通知入会的所有成员端控制权已经被占用；发起端收到授权消息后开始向媒体服务器上传视频流；媒体服务器把发起端的上行视频流程放在第一路流转发给各个成员端，同时抑制声音激励模式；其他成员端在收到控制权已经被占用的消息后切换到电子白板界面，显示第一路视频流；
    若否，则媒体服务器拒绝白板发起请求。
  11. 根据权利要求10所述的方法，其中，还包括：
    发起端向媒体服务器请求结束白板业务；
    媒体服务器根据发起端向服务器结束白板请求，将白板的控制权设置为空闲状态，向其他成员端下发电子白板释放信息；
    其他成员端收到电子白板释放标志后释放本端的电子白板界面。
  12. 根据权利要求7所述的方法，其中，所述白板操作数据还包括区分不同的线条、不同的字体及不同的操作的操作数据。
  13. 根据权利要求4所述的方法，其中，成员端与媒体服务器之间采用RTCP协议进行控制及交互。
  14. 一种移动终端，其特中，包括：
    采集模块，用于采集电子白板操作数据；
    视频生成模块，用于将所述白板操作数据合成为视频画面；
    传输模块，用于将所述视频画面传递到在多方视频业务中其他成员端。
  15. 如权利要求14所述的移动终端，其中，所述采集模块，用于：
    采集白板操作的操作数据；
    判断是否完成一次白板操作；
    若是，则结束采集所述白板操作的操作数据；
    若否，则继续采集所述白板操作的操作数据。
  16. 如权利要求15所述的移动终端，其中，所述视频生成模块，用于：用所述白板操作数据重绘电子白板的显示画面，得到合成白板操作的视频画面。
  17. 一种电子白板系统，其中，包括：
    媒体服务器，用于将所述白板操作数据转发给所述发起端；
    发起端，用于采集本端的所述白板操作的操作数据；用于接收所述白板操作数据；用于将所述白板操作数据合成为视频画面；用于将所述视频画面传递到在多方视频业务中其他成员端；
    其它成员端，用于采集本端的所述白板操作的操作数据，并向媒体服务器发送白板操作数据。
  18. 如权利要求17所述的电子白板系统，其中，所采集的所述白板操作数据为白板操作的点阵数据。
  19. 如权利要求17所述的电子白板系统，其中，所述发起端将所述白板操作数据合成为视频画面，包括：由所述发起端将本次白板操作的操作数据还原为白板操作的动作重绘在发起端生成的时间最近的视频画面上，从而生成本次白板操作的视频画面。
  20. 如权利要求17所述的电子白板系统，其中，所述发起端将所述视频画面传递到在多方视频业务中其他成员端，包括：
    所述发起端通过上行视频流程将所述视频画面传递到所述媒体服务器；
    所述媒体服务器将视频画面传递到除发起端之外的其它成员端的第一路下行视频流中。
  21. 如权利要求17所述的电子白板系统，其中，媒体服务器及各成员端的功能还包括：
    媒体服务器，用于判断电子白板的控制权是否为空闲状态；若是，则媒体服务器授权给该发起端，并将电子白板的控制权设置为白板状态，通知入会的所有成员端控制权已经被占用；把发起端的上行视频流程放在第一路流转发给各个成员端，同时抑制声音激励模式；若否，则媒体服务器拒绝白板发起请求；
    发起端，用于向媒体服务器申请发起电子白板操作；收到授权信息后开始向媒体服务器上传视频流；
    其它成员端，用于在收到控制权已经被占用的消息后切换到电子白板界面，显示第一路视频流。
  22. 如权利要求17所述的电子白板系统，其中，媒体服务器及各成员端的功能还包括：
    媒体服务器，用于根据发起端向服务器结束白板请求，将白板的控制权设置为空闲状态，向其他成员端下发电子白板释放信息；
    发起端，用于向媒体服务器请求结束白板业务；
    其它成员端，用于在收到电子白板释放标志后释放本端的电子白板界面。
  23. 如权利要求17所述的电子白板系统，其中，成员端与媒体服务器之间采用RTCP协议进行控制及交互。
PCT/CN2019/109604 2018-12-11 2019-09-30 电子白板的控制方法、移动终端及电子白板系统 WO2020119229A1 (zh)

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