CN109168064B - Synchronous display method and system of electronic data - Google Patents
Synchronous display method and system of electronic data Download PDFInfo
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- CN109168064B CN109168064B CN201811082583.1A CN201811082583A CN109168064B CN 109168064 B CN109168064 B CN 109168064B CN 201811082583 A CN201811082583 A CN 201811082583A CN 109168064 B CN109168064 B CN 109168064B
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- 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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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- 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
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64746—Control signals issued by the network directed to the server or the client
- H04N21/64761—Control signals issued by the network directed to the server or the client directed to the server
- H04N21/64776—Control signals issued by the network directed to the server or the client directed to the server for requesting retransmission, e.g. of data packets lost or corrupted during transmission from server
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Abstract
The embodiment of the invention provides a method and a system for synchronously displaying electronic data, wherein the method comprises the following steps: the node server of the video network receives the operation prohibiting instruction from the first video network terminal and sends the operation prohibiting instruction to other video network terminals; the node server of the video network receives the data packet from the first video network terminal and sends the data packet to other video network terminals; the data package contains the electronic data that has changed and the data type of the electronic data; and other video network terminals forbid the control operation responding to the user according to the operation forbidding instruction, analyze the data packet to obtain an analysis result and draw electronic data according to the analysis result. The embodiment of the invention synchronously displays the electronic data on one video network terminal in the video network terminal group on other video network terminals in the video network group, and realizes the synchronous display of the teaching resources on one interactive electronic whiteboard on other interactive electronic whiteboards in the educational scene.
Description
Technical Field
The invention relates to the technical field of video networking, in particular to a synchronous display method and a synchronous display system of electronic data.
Background
The interactive electronic whiteboard can be in information communication with a computer, the electronic whiteboard is connected to the computer, and the projector is used for projecting the content on the computer to the screen of the electronic whiteboard, the electronic whiteboard at the moment is equivalent to a handwriting board with a large area, the handwriting board can be used for randomly writing and drawing on the handwriting board and displaying the handwriting board on the computer in real time, and the written or drawn file can be stored as a graphic file.
At present, teaching resources of the education industry have the problem of being very short of each other, and in order to improve the utilization rate of the teaching resources, an interactive electronic whiteboard is indispensable equipment in the actual teaching process, and how to realize synchronous display of a plurality of interactive electronic whiteboards is an urgent problem to be solved.
Disclosure of Invention
In view of the above problems, embodiments of the present invention are proposed to provide a synchronous display method of electronic data and a corresponding synchronous display system of electronic data that overcome or at least partially solve the above problems.
In order to solve the above problem, an embodiment of the present invention discloses a method for synchronously displaying electronic data, where the method is applied to a video network, and the video network includes: the method comprises the following steps that a video networking node server and a video networking terminal group are provided, the video networking node server is communicated with each video networking terminal in the video networking terminal group, any two video networking terminals in the video networking terminal group are communicated, and the method comprises the following steps: the video network node server receives an operation prohibiting instruction from a first video network terminal in the video network terminal group and sends the operation prohibiting instruction to other video network terminals except the first video network terminal in the video network terminal group; the node server of the video network receives at least one group of data packets from the first video network terminal and sends the at least one group of data packets to other video network terminals; wherein the data package contains the electronic data that has changed and a data type of the electronic data; and the other video network terminals are used for forbidding the control operation responding to the user according to the operation forbidding instruction, and the other video network terminals are also used for analyzing at least one group of data packets to obtain an analysis result and drawing the electronic data according to the analysis result.
Optionally, the data packet further includes packet header information, where the packet header information includes a number of the data packet in the current group and a bearer data amount of electronic data included in the data packet; the other video network terminals are used for analyzing each packet header information and each electronic data in at least one group of data packets to obtain an analysis result; the analysis result comprises a number and a load data volume which are obtained by analyzing the header information of the received data packet by the other video network terminals, and an actual data volume which is obtained by analyzing the electronic data in the received data packet by the other video network terminals.
Optionally, if the parsing result indicates a parsing error, the method further includes: the node server of the video network receives a data packet retransmission instruction from the other video network terminals corresponding to the analysis result and retransmits the data packet retransmission instruction to the first video network terminal, and the first video network terminal is used for transmitting corresponding data packets to the node server of the video network according to the data packet retransmission instruction; and the video network node server sends the corresponding data packet to the other corresponding video network terminals.
Optionally, the parsing result represents a parsing error, including: the bearing data volume in the analysis result aiming at the same data packet is different from the actual data volume, and/or the serial number in the analysis result aiming at the same group of data packets is discontinuous; and the first video network terminal is used for sending the data packets with different bearing data volumes and actual data volumes in the analysis result and/or sending the data packets corresponding to the missing numbers to the video network node server according to the data packet retransmission instruction.
Optionally, the data type includes at least one of: line type, straight line type, circular type.
The embodiment of the invention also discloses a synchronous display system of electronic data, which is applied to the video network, wherein the video network comprises: the node server of the video networking communicates with each video networking terminal in the terminal group of the video networking, the arbitrary two video networking terminals in the terminal group of the video networking communicate with each other, the node server of the video networking includes: the forbidden operation forwarding module is used for receiving a forbidden operation instruction from a first video network terminal in the video network terminal group and sending the forbidden operation instruction to other video network terminals except the first video network terminal in the video network terminal group; the data packet forwarding module is used for receiving at least one group of data packets from the first video network terminal and sending the at least one group of data packets to other video network terminals; wherein the data package contains the electronic data that has changed and a data type of the electronic data; and the other video network terminals are used for forbidding the control operation responding to the user according to the operation forbidding instruction, and the other video network terminals are also used for analyzing at least one group of data packets to obtain an analysis result and drawing the electronic data according to the analysis result.
Optionally, the data packet further includes packet header information, where the packet header information includes a number of the data packet in the current group and a bearer data amount of electronic data included in the data packet; the other video network terminals are used for analyzing each packet header information and each electronic data in at least one group of data packets to obtain an analysis result; the analysis result comprises a number and a load data volume which are obtained by analyzing the header information of the received data packet by the other video network terminals, and an actual data volume which is obtained by analyzing the electronic data in the received data packet by the other video network terminals.
Optionally, if the parsing result indicates a parsing error, the node server of the video network further includes: the retransmission instruction forwarding module is used for receiving a data packet retransmission instruction from the other video network terminals corresponding to the analysis result and forwarding the data packet retransmission instruction to the first video network terminal, and the first video network terminal is used for sending corresponding data packets to the video network node server according to the data packet retransmission instruction; and the data packet forwarding module is further configured to send the corresponding data packet to the corresponding other video networking terminal.
Optionally, the parsing result represents a parsing error, including: the bearing data volume in the analysis result aiming at the same data packet is different from the actual data volume, and/or the serial number in the analysis result aiming at the same group of data packets is discontinuous; and the first video network terminal is used for sending the data packets with different bearing data volumes and actual data volumes in the analysis result and/or sending the data packets corresponding to the missing numbers to the video network node server according to the data packet retransmission instruction.
Optionally, the data type includes at least one of: line type, straight line type, circular type.
The embodiment of the invention has the following advantages:
the embodiment of the invention is applied to the video networking, and the video networking can comprise a video networking node server and a video networking terminal group, wherein the video networking node server is communicated with each video networking terminal in the video networking terminal group, and any two video networking terminals in the video networking terminal group are communicated with each other.
In the embodiment of the invention, a user can operate on any one video network terminal in the video network group, such as teaching operation. When a user operates on a certain video network terminal, the video network terminal can be called a first video network terminal, the first video network terminal sends an operation prohibiting instruction to a video network node server, and the video network node server sends the operation prohibiting instruction to other video network terminals in a video network group. The main function of the operation prohibiting instruction is to make other video network terminals in the video network group not accept any operation of the user, so that only one video network terminal in the video network group can respond to the operation of the user at the same time or in the same time period. When a user operates on the first video network terminal, the electronic data on the first video network terminal can be changed, the changed electronic data and the data type of the changed electronic data are transmitted to the video network node server in the form of a group of data packets by the first video network terminal, and the video network node server forwards the received data packets to other video network terminals in the video network terminal group. And other video network terminals analyze the received data packet and draw electronic data according to the analysis result.
The embodiment of the invention applies the characteristics of the video network, a user performs teaching operation on a first video network terminal, the first video network terminal transmits changed electronic data to a video network node server in the form of data packets, the video network node server forwards the received data packets to other video network terminals, and the other video network terminals analyze the received data packets and draw electronic data locally according to the analysis result. The embodiment of the invention synchronously displays the electronic data on one video network terminal in the video network terminal group on other video network terminals in the video network group, and realizes the synchronous display of the teaching resources on one interactive electronic whiteboard on other interactive electronic whiteboards in the educational scene.
Drawings
FIG. 1 is a schematic networking diagram of a video network of the present invention;
FIG. 2 is a schematic diagram of a hardware architecture of a node server according to the present invention;
fig. 3 is a schematic diagram of a hardware structure of an access switch of the present invention;
fig. 4 is a schematic diagram of a hardware structure of an ethernet protocol conversion gateway according to the present invention;
FIG. 5 is a flowchart illustrating the steps of one embodiment of a method for the synchronized display of electronic data in accordance with the present invention;
fig. 6 is a schematic illustration of a method for synchronized display of an interactive electronic whiteboard of the present invention;
FIG. 7 is a block diagram of a video networking node server in an embodiment of a system for synchronized display of electronic data in accordance with the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The video networking is an important milestone for network development, is a real-time network, can realize high-definition video real-time transmission, and pushes a plurality of internet applications to high-definition video, and high-definition faces each other.
The video networking adopts a real-time high-definition video exchange technology, can integrate required services such as dozens of services of video, voice, pictures, characters, communication, data and the like on a system platform on a network platform, such as high-definition video conference, video monitoring, intelligent monitoring analysis, emergency command, digital broadcast television, delayed television, network teaching, live broadcast, VOD on demand, television mail, Personal Video Recorder (PVR), intranet (self-office) channels, intelligent video broadcast control, information distribution and the like, and realizes high-definition quality video broadcast through a television or a computer.
To better understand the embodiments of the present invention, the following description refers to the internet of view:
some of the technologies applied in the video networking are as follows:
network Technology (Network Technology)
Network technology innovation in video networking has improved over traditional Ethernet (Ethernet) to face the potentially enormous video traffic on the network. Unlike pure network Packet Switching (Packet Switching) or network circuit Switching (circuit Switching), the internet of vision technology employs network Packet Switching to satisfy the demand of Streaming (which is interpreted as Streaming, continuous broadcasting, and is a data transmission technology that changes received data into a stable continuous stream and continuously transmits the stream, so that the sound heard or image seen by the user is very smooth, and the user can start browsing on the screen before the whole data is transmitted). The video networking technology has the advantages of flexibility, simplicity and low price of packet switching, and simultaneously has the quality and safety guarantee of circuit switching, thereby realizing the seamless connection of the whole network switching type virtual circuit and the data format.
Switching Technology (Switching Technology)
The video network adopts two advantages of asynchronism and packet switching of the Ethernet, eliminates the defects of the Ethernet on the premise of full compatibility, has end-to-end seamless connection of the whole network, is directly communicated with a user terminal, and directly bears an IP data packet. The user data does not require any format conversion across the entire network. The video networking is a higher-level form of the Ethernet, is a real-time exchange platform, can realize the real-time transmission of the whole-network large-scale high-definition video which cannot be realized by the existing Internet, and pushes a plurality of network video applications to high-definition and unification.
Server Technology (Server Technology)
The server technology on the video networking and unified video platform is different from the traditional server, the streaming media transmission of the video networking and unified video platform is established on the basis of connection orientation, the data processing capacity of the video networking and unified video platform is independent of flow and communication time, and a single network layer can contain signaling and data transmission. For voice and video services, the complexity of video networking and unified video platform streaming media processing is much simpler than that of data processing, and the efficiency is greatly improved by more than one hundred times compared with that of a traditional server.
Storage Technology (Storage Technology)
The super-high speed storage technology of the unified video platform adopts the most advanced real-time operating system in order to adapt to the media content with super-large capacity and super-large flow, the program information in the server instruction is mapped to the specific hard disk space, the media content is not passed through the server any more, and is directly sent to the user terminal instantly, and the general waiting time of the user is less than 0.2 second. The optimized sector distribution greatly reduces the mechanical motion of the magnetic head track seeking of the hard disk, the resource consumption only accounts for 20% of that of the IP internet of the same grade, but concurrent flow which is 3 times larger than that of the traditional hard disk array is generated, and the comprehensive efficiency is improved by more than 10 times.
Network Security Technology (Network Security Technology)
The structural design of the video network completely eliminates the network security problem troubling the internet structurally by the modes of independent service permission control each time, complete isolation of equipment and user data and the like, generally does not need antivirus programs and firewalls, avoids the attack of hackers and viruses, and provides a structural carefree security network for users.
Service Innovation Technology (Service Innovation Technology)
The unified video platform integrates services and transmission, and is not only automatically connected once whether a single user, a private network user or a network aggregate. The user terminal, the set-top box or the PC are directly connected to the unified video platform to obtain various multimedia video services in various forms. The unified video platform adopts a menu type configuration table mode to replace the traditional complex application programming, can realize complex application by using very few codes, and realizes infinite new service innovation.
Networking of the video network is as follows:
the video network is a centralized control network structure, and the network can be a tree network, a star network, a ring network and the like, but on the basis of the centralized control node, the whole network is controlled by the centralized control node in the network.
As shown in fig. 1, the video network is divided into an access network and a metropolitan network.
The devices of the access network part can be mainly classified into 3 types: node server, access switch, terminal (including various set-top boxes, coding boards, memories, etc.). The node server is connected to an access switch, which may be connected to a plurality of terminals and may be connected to an ethernet network.
The node server is a node which plays a centralized control function in the access network and can control the access switch and the terminal. The node server can be directly connected with the access switch or directly connected with the terminal.
Similarly, devices of the metropolitan network portion may also be classified into 3 types: a metropolitan area server, a node switch and a node server. The metro server is connected to a node switch, which may be connected to a plurality of node servers.
The node server is a node server of the access network part, namely the node server belongs to both the access network part and the metropolitan area network part.
The metropolitan area server is a node which plays a centralized control function in the metropolitan area network and can control a node switch and a node server. The metropolitan area server can be directly connected with the node switch or directly connected with the node server.
Therefore, the whole video network is a network structure with layered centralized control, and the network controlled by the node server and the metropolitan area server can be in various structures such as tree, star and ring.
The access network part can form a unified video platform (circled part), and a plurality of unified video platforms can form a video network; each unified video platform may be interconnected via metropolitan area and wide area video networking.
Video networking device classification
1.1 devices in the video network of the embodiment of the present invention can be mainly classified into 3 types: servers, switches (including ethernet gateways), terminals (including various set-top boxes, code boards, memories, etc.). The video network as a whole can be divided into a metropolitan area network (or national network, global network, etc.) and an access network.
1.2 wherein the devices of the access network part can be mainly classified into 3 types: node servers, access switches (including ethernet gateways), terminals (including various set-top boxes, code boards, memories, etc.).
The specific hardware structure of each access network device is as follows:
a node server:
as shown in fig. 2, the system mainly includes a network interface module 201, a switching engine module 202, a CPU module 203, and a disk array module 204.
The network interface module 201, the CPU module 203, and the disk array module 204 all enter the switching engine module 202; the switching engine module 202 performs an operation of looking up the address table 205 on the incoming packet, thereby obtaining the direction information of the packet; and stores the packet in a queue of the corresponding packet buffer 206 based on the packet's steering information; if the queue of the packet buffer 206 is nearly full, it is discarded; the switching engine module 202 polls all packet buffer queues for forwarding if the following conditions are met: 1) the port send buffer is not full; 2) the queue packet counter is greater than zero. The disk array module 204 mainly implements control over the hard disk, including initialization, read-write, and other operations on the hard disk; the CPU module 203 is mainly responsible for protocol processing with an access switch and a terminal (not shown in the figure), configuring an address table 205 (including a downlink protocol packet address table, an uplink protocol packet address table, and a data packet address table), and configuring the disk array module 204.
The access switch:
as shown in fig. 3, the network interface module (downstream network interface module 301, upstream network interface module 302), the switching engine module 303, and the CPU module 304 are mainly included.
Wherein, the packet (uplink data) coming from the downlink network interface module 301 enters the packet detection module 305; the packet detection module 305 detects whether the Destination Address (DA), the Source Address (SA), the packet type, and the packet length of the packet meet the requirements, if so, allocates a corresponding stream identifier (stream-id) and enters the switching engine module 303, otherwise, discards the stream identifier; the packet (downstream data) coming from the upstream network interface module 302 enters the switching engine module 303; the data packet coming from the CPU module 204 enters the switching engine module 303; the switching engine module 303 performs an operation of looking up the address table 306 on the incoming packet, thereby obtaining the direction information of the packet; if the packet entering the switching engine module 303 is from the downstream network interface to the upstream network interface, the packet is stored in the queue of the corresponding packet buffer 307 in association with the stream-id; if the queue of the packet buffer 307 is nearly full, it is discarded; if the packet entering the switching engine module 303 is not from the downlink network interface to the uplink network interface, the data packet is stored in the queue of the corresponding packet buffer 307 according to the guiding information of the packet; if the queue of the packet buffer 307 is nearly full, it is discarded.
The switching engine module 303 polls all packet buffer queues, which in this embodiment of the present invention is divided into two cases:
if the queue is from the downlink network interface to the uplink network interface, the following conditions are met for forwarding: 1) the port send buffer is not full; 2) the queued packet counter is greater than zero; 3) and obtaining the token generated by the code rate control module.
If the queue is not from the downlink network interface to the uplink network interface, the following conditions are met for forwarding: 1) the port send buffer is not full; 2) the queue packet counter is greater than zero.
The rate control module 208 is configured by the CPU module 204, and generates tokens for packet buffer queues from all downstream network interfaces to upstream network interfaces at programmable intervals to control the rate of upstream forwarding.
The CPU module 304 is mainly responsible for protocol processing with the node server, configuration of the address table 306, and configuration of the code rate control module 308.
Ethernet protocol conversion gateway：
As shown in fig. 4, the apparatus mainly includes a network interface module (a downlink network interface module 401 and an uplink network interface module 402), a switching engine module 403, a CPU module 404, a packet detection module 405, a rate control module 408, an address table 406, a packet buffer 407, a MAC adding module 409, and a MAC deleting module 410.
Wherein, the data packet coming from the downlink network interface module 401 enters the packet detection module 405; the packet detection module 405 detects whether the ethernet MAC DA, the ethernet MAC SA, the ethernet length frame type, the video network destination address DA, the video network source address SA, the video network packet type, and the packet length of the packet meet the requirements, and if so, allocates a corresponding stream identifier (stream-id); then, the MAC deletion module 410 subtracts MAC DA, MAC SA, length or frame type (2byte) and enters the corresponding receiving buffer, otherwise, discards it;
the downlink network interface module 401 detects the sending buffer of the port, and if there is a packet, acquires the ethernet MAC DA of the corresponding terminal according to the video networking destination address DA of the packet, adds the ethernet MAC DA of the terminal, the MACSA of the ethernet coordination gateway, and the ethernet length or frame type, and sends the packet.
The other modules in the ethernet protocol gateway function similarly to the access switch.
A terminal:
the system mainly comprises a network interface module, a service processing module and a CPU module; for example, the set-top box mainly comprises a network interface module, a video and audio coding and decoding engine module and a CPU module; the coding board mainly comprises a network interface module, a video and audio coding engine module and a CPU module; the memory mainly comprises a network interface module, a CPU module and a disk array module.
1.3 devices of the metropolitan area network part can be mainly classified into 3 types: node server, node exchanger, metropolitan area server. The node switch mainly comprises a network interface module, a switching engine module and a CPU module; the metropolitan area server mainly comprises a network interface module, a switching engine module and a CPU module.
2. Video networking packet definition
2.1 Access network packet definition
The data packet of the access network mainly comprises the following parts: destination Address (DA), Source Address (SA), reserved bytes, payload (pdu), CRC.
As shown in the following table, the data packet of the access network mainly includes the following parts:
| DA | SA | Reserved | Payload | CRC |
the Destination Address (DA) is composed of 8 bytes (byte), the first byte represents the type of the data packet (e.g. various protocol packets, multicast data packets, unicast data packets, etc.), there are at most 256 possibilities, the second byte to the sixth byte are metropolitan area network addresses, and the seventh byte and the eighth byte are access network addresses.
The Source Address (SA) is also composed of 8 bytes (byte), defined as the same as the Destination Address (DA).
The reserved byte consists of 2 bytes.
The payload part has different lengths according to types of different datagrams, and is 64 bytes if the type of the datagram is a variety of protocol packets, or is 1056 bytes if the type of the datagram is a unicast packet, but is not limited to the above 2 types.
The CRC consists of 4 bytes and is calculated in accordance with the standard ethernet CRC algorithm.
2.2 metropolitan area network packet definition
The topology of a metropolitan area network is a graph and there may be 2, or even more than 2, connections between two devices, i.e., there may be more than 2 connections between a node switch and a node server, a node switch and a node switch, and a node switch and a node server. However, the metro network address of the metro network device is unique, and in order to accurately describe the connection relationship between the metro network devices, parameters are introduced in the embodiment of the present invention: a label to uniquely describe a metropolitan area network device.
In this specification, the definition of the Label is similar to that of a Label of Multi-Protocol Label switching (MPLS), and assuming that there are two connections between a device a and a device B, there are 2 labels for a packet from the device a to the device B, and 2 labels for a packet from the device B to the device a. The label is classified into an incoming label and an outgoing label, and assuming that the label (incoming label) of the packet entering the device a is 0x0000, the label (outgoing label) of the packet leaving the device a may become 0x 0001. The network access process of the metro network is a network access process under centralized control, that is, address allocation and label allocation of the metro network are both dominated by the metro server, and the node switch and the node server are both passively executed, which is different from label allocation of MPLS, and label allocation of MPLS is a result of mutual negotiation between the switch and the server.
As shown in the following table, the data packet of the metro network mainly includes the following parts:
| DA | SA | Reserved | label (R) | Payload | CRC |
Namely Destination Address (DA), Source Address (SA), Reserved byte (Reserved), tag, payload (pdu), CRC. The format of the tag may be defined by reference to the following: the tag is 32 bits with the upper 16 bits reserved and only the lower 16 bits used, and its position is between the reserved bytes and payload of the packet.
Based on the characteristics of the video network, one of the core concepts of the embodiment of the invention is provided, a user carries out teaching operation on a first video network terminal following a protocol of the video network, the first video network terminal transmits electronic data changed by the teaching operation to a video network node server in the form of a data packet, the video network node server forwards the received data packet to other video network terminals, and the other video network terminals analyze the received data packet and draw the electronic data locally according to an analysis result.
Referring to fig. 5, a flowchart illustrating steps of an embodiment of a method for synchronously displaying electronic data according to the present invention is shown, where the method may be applied to a video network, and the video network may include a video network node server and a video network terminal group, where the video network node server communicates with each video network terminal in the video network terminal group, and any two video network terminals in the video network terminal group communicate with each other, and the method specifically may include the following steps:
In the embodiment of the invention, the video networking terminal group can be composed of a plurality of video networking terminals which are all connected with the video networking node server, wherein the video networking terminal operated by a user can be called a first video networking terminal. It should be noted that, in the video networking terminal group in the embodiment of the present invention, only one video networking terminal is allowed to be simultaneously operated by a user, and when the user operates one video networking terminal, other video networking terminals do not accept any operation of the user. Therefore, when the user operates on the first video network terminal, the first video network terminal sends an operation prohibiting instruction to the video network node server, and the operation prohibiting instruction mainly plays a role in prohibiting other video network terminals in the video network terminal group from accepting the user operation when the first video network terminal accepts the user operation, so that the situation that a plurality of video network terminals exist in the video network terminal group at the same time to accept the user operation is avoided.
In a preferred embodiment of the present invention, the operation prohibition instruction may include identification information of the first video network terminal, an operation prohibition identifier, and the like, and in practical applications, the operation prohibition instruction may further include identification information of the target video network terminal, and a start time and an end time of the operation prohibition, and the like, where the identification information of the target video network terminal mainly serves to determine, by the video network node server, a destination terminal that sends the operation prohibition instruction according to the identification information of the target video network terminal, and specifically, the video network node server may determine, according to a preset correspondence between the identification information and a network address, a network address corresponding to the identification information of the target video network terminal, and then send the operation prohibition instruction according to the determined network address.
In step 502, the node server of the video network receives at least one group of data packets from the first video network terminal and sends the at least one group of data packets to other video network terminals so as to synchronously display the changed electronic data on the first video network terminal on the other video network terminals.
In the embodiment of the present invention, a user performs a relevant operation, such as a teaching operation, on the first video network terminal, where the operation may change electronic data of the first video network terminal, for example, the user performs a drawing operation on the interactive electronic whiteboard, and the drawing operation may change colors of relevant pixel points on the interactive electronic whiteboard, so as to form "ink" with a certain shape and color. The first video network terminal can transmit the changed electronic data and the data type of the electronic data to the video network node server in the form of data packets, for example, the first video network terminal can transmit the coordinates (x) of the pixel point aa，ya) And the coordinates (x) of pixel point bb，yb) And transmitting the data type of the straight line type to the node server of the video network in the form of a data packet. The coordinates (x) of the electronic data in the data packet, i.e., the pixel point aa，ya) And the coordinates (x) of pixel point bb，yb) And, the data type of the straight line type may represent a line segment between pixel a and pixel b. The data type in the embodiment of the present invention may be a bit line type, a circular type, or the like, in addition to the straight line type described above, and the type of the data type is not particularly limited in the embodiment of the present invention.
Moreover, the first video network terminal may transmit the changed electronic data in the form of a group of data packets, for example, the first video network terminal transmits 3 groups of data packets, wherein the 1 st group of data packets includes 10 data packets, the 2 nd group of data packets includes 10 data packets, and the 3 rd group of data packets includes 8 data packets. Each data packet in each group of data packets may further include header information, where the header information includes the number of the data packet in the current group and the data carrying amount of the electronic data included in the data packet. In the above example, the header information of the 3 rd bit data packet in the 1 st group of data packets includes the number "3" of the data packet in the 1 st group of data packets, and the data carrying amount "1024" of the electronic data included in the data packet.
In the embodiment of the invention, after the video network node server receives a group of data packets, the data packets are sequentially transmitted to other video network terminals according to the receiving sequence of the data packets. In practical application, the node server of the video network can store a group of received data packets into a preset buffer queue, and then transmit the data packets in the buffer queue to other video network terminals simultaneously according to the first-in first-out principle. For example, the node server of the video network receives the 1 st group of data packets, the 2 nd group of data packets and the 3 rd group of data packets in sequence, transmits the 1 st group of data packets to the video network terminals q1 and q2 simultaneously, transmits the 2 nd group of data packets to the video network terminals q1 and q2 simultaneously, and transmits the 3 rd group of data packets to the video network terminals q1 and q2 simultaneously.
In the embodiment of the invention, after other video network terminals receive the data packet, the data packet can be analyzed, and the electronic data can be drawn locally according to the analysis result. Specifically, the other video network terminal may parse each packet header information and the electronic data in the received at least one group of data packets to obtain a parsing result. The parsing result may include the number of the data packet in the current group and the data carrying amount of the electronic data included in the data packet, as well as the actual data amount of the electronic data received by other video network terminals.
In a preferred embodiment of the present invention, the other video network terminals analyze the received data packet, and a situation of an analysis error may occur, such as a packet loss, a data amount being different, and the like. The packet loss means that in a group of data packets, other video network terminals do not receive a certain data packet or a certain data packet. In this case, the packet number of the current group is not consecutive in the analysis result for the same group of packets. For example, the analysis result of the 1 st packet by the other video network terminal does not include the 6 th packet. The data amount is different, that is, in one data packet, the actual data amount of the electronic data received by other video network terminals is different from the bearer data amount in the header information, for example, the bearer data amount in the header information of the 2 nd data packet in the 1 st data packet received by other video network terminals is "1024", and the actual data amount of the electronic data in the data packet is "1000".
Aiming at the situation of the analysis error, other video network terminals can send data packet retransmission instructions to the video network node server, the video network node server forwards the data packet retransmission instructions to the first video network terminal, the first video network terminal sends data packets corresponding to the data packet retransmission instructions to the video network node server according to the data packet retransmission instructions, and the video network node server returns the received data packets to other video network terminals. For example, the video network terminal q1 sends a data packet retransmission instruction z1 to the video network node server, where the data packet retransmission instruction z1 includes a retransmission reason (e.g., 6 th data packet of group 1 is not received) and information related to the retransmission data packet (e.g., information related to 6 th data packet of group 1), and so on, the video network node server forwards the data packet retransmission instruction z1 to the first video network terminal, the first video network terminal resends the 6 th data packet of group 1 to the video network node server according to the data packet retransmission instruction z1, and the video network node server returns the 6 th data packet of group 1 to the video network terminal q 1. For another example, the network terminal q2 sends a packet retransmission command z2 to the network node server, where the packet retransmission command z2 includes a retransmission reason (the data carrying amount of the electronic data of the 8 th data packet in group 1 is different from the actual data amount) and information related to the retransmission packet (e.g., information related to the 8 th data packet in group 1), and the like, the network node server forwards the packet retransmission command z2 to the first network terminal, the first network terminal resends the 8 th data packet in group 1 to the network node server according to the packet retransmission command z2, and the network node server returns the 8 th data packet in group 1 to the network node q 2.
It should be noted that, in the case of the above analysis error, it is not meant that all other video network terminals analyze the error, and when the analysis error occurs in one other video network terminal or some other video network terminals, the video network node server receives a data packet retransmission instruction sent by the one other video network terminal or some other video network terminals, and correspondingly returns the retransmitted data packet received from the first video network terminal to the one other video network terminal or some other video network terminals.
Based on the above description of the embodiment of the method for synchronously displaying electronic data, a method for synchronously displaying an interactive electronic whiteboard is introduced below, as shown in fig. 6, in the method, a plurality of interactive electronic whiteboards are involved, the plurality of interactive electronic whiteboards are connected in the same video networking environment, and every two interactive electronic whiteboards can communicate with each other through a video networking node server. When an interactive whiteboard (interactive whiteboard wb1) is operating, the interactive whiteboard wb1 sends an operation prohibition command to the other interactive whiteboard (interactive whiteboard wb2) through the video network node server, so that the other interactive whiteboard does not accept the operation of the user. When the electronic data of the interactive electronic whiteboard changes, the interactive electronic whiteboard sends the changed electronic data and data types to other interactive electronic whiteboards through the node server of the video network. And the other interactive electronic whiteboards analyze the received data packet, and draw lines, graphs or characters and the like according to the analysis result. When other interactive electronic whiteboards have analysis errors, such as packet loss, different data quantity and the like, the other interactive electronic whiteboards send data packet retransmission instructions to the interactive electronic whiteboards through the video networking node server, and the interactive electronic whiteboards retransmit the data packets with the analysis errors to the video networking node server according to the data packet retransmission instructions. And the video networking node server returns the received data packet to other interactive electronic whiteboards with analysis error conditions, and finally the interactive electronic whiteboards and other interactive electronic whiteboards can synchronously display electronic data.
The embodiment of the invention is applied to the video networking, and the video networking can comprise a video networking node server and a video networking terminal group, wherein the video networking node server is communicated with each video networking terminal in the video networking terminal group, and any two video networking terminals in the video networking terminal group are communicated with each other.
In the embodiment of the invention, a user can operate on any one video network terminal in the video network group, such as teaching operation. When a user operates on a certain video network terminal, the video network terminal can be called a first video network terminal, the first video network terminal sends an operation prohibiting instruction to a video network node server, and the video network node server sends the operation prohibiting instruction to other video network terminals in a video network group. The main function of the operation prohibiting instruction is to make other video network terminals in the video network group not accept any operation of the user, so that only one video network terminal in the video network group can respond to the operation of the user at the same time or in the same time period. When a user operates on the first video network terminal, the electronic data on the first video network terminal can be changed, the changed electronic data and the data type of the changed electronic data are transmitted to the video network node server in the form of a group of data packets by the first video network terminal, and the video network node server forwards the received data packets to other video network terminals in the video network terminal group. And other video network terminals analyze the received data packet and draw electronic data according to the analysis result.
The embodiment of the invention applies the characteristics of the video network, a user performs teaching operation on a first video network terminal, the first video network terminal transmits changed electronic data to a video network node server in the form of data packets, the video network node server forwards the received data packets to other video network terminals, and the other video network terminals analyze the received data packets and draw electronic data locally according to the analysis result. The embodiment of the invention synchronously displays the electronic data on one video network terminal in the video network terminal group on other video network terminals in the video network group, and realizes the synchronous display of the teaching resources on one interactive electronic whiteboard on other interactive electronic whiteboards in the educational scene.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Referring to fig. 7, there is shown a block diagram of a node server of a video network in an embodiment of a system for synchronous display of electronic data according to the present invention, where the system can be applied to a video network, and the video network can include: the system comprises a video networking node server and a video networking terminal group, wherein the video networking node server communicates with each video networking terminal in the video networking terminal group, any two video networking terminals in the video networking terminal group communicate with each other, and the video networking node server in the system specifically comprises the following modules:
the forbidding forwarding module 701 is configured to receive an operation forbidding instruction from a first video network terminal in the video network terminal group, and send the operation forbidding instruction to other video network terminals in the video network terminal group except the first video network terminal.
The data packet forwarding module 702 is configured to receive at least one set of data packets from the first video network terminal, and send the at least one set of data packets to other video network terminals.
Wherein the data package contains the electronic data that has changed and a data type of the electronic data; and the other video network terminals are used for forbidding the control operation responding to the user according to the operation forbidding instruction, and the other video network terminals are also used for analyzing at least one group of data packets to obtain an analysis result and drawing electronic data according to the analysis result.
In a preferred embodiment of the present invention, the data packet further includes packet header information, where the packet header information includes the number of the data packet in the current group and the data carrying capacity of the electronic data included in the data packet; the other video network terminals are used for analyzing each packet header information and each electronic data in at least one group of data packets to obtain an analysis result; the analysis result comprises the number and the bearing data volume which are obtained by analyzing the header information of the received data packet by other video network terminals, and the actual data volume which is obtained by analyzing the electronic data in the received data packet by other video network terminals.
In a preferred embodiment of the present invention, if the parsing result indicates a parsing error, the node server of the video network further includes: a retransmission instruction forwarding module 703, configured to receive a data packet retransmission instruction from another video network terminal corresponding to the analysis result, and forward the data packet retransmission instruction to the first video network terminal, where the first video network terminal is configured to send a corresponding data packet to the video network node server according to the data packet retransmission instruction; the data packet forwarding module 702 is further configured to send the corresponding data packet to the corresponding other video network terminal.
In a preferred embodiment of the present invention, the parsing result represents a parsing error, including: the bearing data volume in the analysis result aiming at the same data packet is different from the actual data volume, and/or the serial number in the analysis result aiming at the same group of data packets is discontinuous; and the first video network terminal is used for sending the data packets with different bearing data volumes and actual data volumes in the analysis result and/or the data packets corresponding to the missing numbers to the video network node server according to the data packet retransmission instruction.
In a preferred embodiment of the invention, the data type comprises at least one of: line type, straight line type, circular type.
For the system embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The method for synchronously displaying electronic data and the system for synchronously displaying electronic data provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method for the synchronized display of electronic data, said method being applied in a video network comprising: the method comprises the following steps that a video networking node server and a video networking terminal group are provided, the video networking node server is communicated with each video networking terminal in the video networking terminal group, any two video networking terminals in the video networking terminal group are communicated, and the method comprises the following steps:
the video networking node server receives an operation prohibiting instruction from a first video networking terminal in the video networking terminal group and sends the operation prohibiting instruction to other video networking terminals except the first video networking terminal in the video networking terminal group, the first video networking terminal is a video networking terminal which is operated by a user, and the operation prohibiting instruction is sent to the video networking node server by the first video networking terminal when the user operates on the first video networking terminal;
the node server of the video network receives at least one group of data packets from the first video network terminal and sends the at least one group of data packets to other video network terminals;
wherein the data package contains the electronic data that has changed and a data type of the electronic data; and the other video network terminals are used for forbidding the control operation responding to the user according to the operation forbidding instruction, and the other video network terminals are also used for analyzing at least one group of data packets to obtain an analysis result and drawing the electronic data according to the analysis result.
2. The method for synchronously displaying electronic data according to claim 1, wherein the data packet further comprises header information, the header information includes a number of the data packet in the current group and a data carrying amount of the electronic data included in the data packet;
the other video network terminals are used for analyzing each packet header information and each electronic data in at least one group of data packets to obtain an analysis result;
the analysis result comprises a number and a load data volume which are obtained by analyzing the header information of the received data packet by the other video network terminals, and an actual data volume which is obtained by analyzing the electronic data in the received data packet by the other video network terminals.
3. The method for synchronously displaying electronic data according to claim 2, wherein if the analysis result indicates an analysis error, the method further comprises:
the node server of the video network receives a data packet retransmission instruction from the other video network terminals corresponding to the analysis result and retransmits the data packet retransmission instruction to the first video network terminal, and the first video network terminal is used for transmitting corresponding data packets to the node server of the video network according to the data packet retransmission instruction;
and the video network node server sends the corresponding data packet to the other corresponding video network terminals.
4. The method for synchronously displaying electronic data according to claim 3, wherein the analysis result indicates an analysis error, and comprises:
the bearing data volume in the analysis result aiming at the same data packet is different from the actual data volume, and/or the serial number in the analysis result aiming at the same group of data packets is discontinuous;
and the first video network terminal is used for sending the data packets with different bearing data volumes and actual data volumes in the analysis result and/or sending the data packets corresponding to the missing numbers to the video network node server according to the data packet retransmission instruction.
5. A method for the synchronized display of electronic data according to any one of claims 1 to 4, wherein the data types include at least one of: line type, straight line type, circular type.
6. A system for synchronized display of electronic data, said system being applied in a video network comprising: the node server of the video networking communicates with each video networking terminal in the terminal group of the video networking, the arbitrary two video networking terminals in the terminal group of the video networking communicate with each other, the node server of the video networking includes:
the forbidden operation forwarding module is used for receiving a forbidden operation instruction from a first video network terminal in the video network terminal group and sending the forbidden operation instruction to other video network terminals except the first video network terminal in the video network terminal group, wherein the first video network terminal is a video network terminal operated by a user, and the forbidden operation instruction is sent to the video network node server by the first video network terminal when the user operates on the first video network terminal;
the data packet forwarding module is used for receiving at least one group of data packets from the first video network terminal and sending the at least one group of data packets to other video network terminals;
wherein the data package contains the electronic data that has changed and a data type of the electronic data; and the other video network terminals are used for forbidding the control operation responding to the user according to the operation forbidding instruction, and the other video network terminals are also used for analyzing at least one group of data packets to obtain an analysis result and drawing the electronic data according to the analysis result.
7. The system for synchronized presentation of electronic data according to claim 6, wherein the data packets further include header information including a number of the data packet in a current group and a data carrying amount of the electronic data included in the data packet;
the other video network terminals are used for analyzing each packet header information and each electronic data in at least one group of data packets to obtain an analysis result;
the analysis result comprises a number and a load data volume which are obtained by analyzing the header information of the received data packet by the other video network terminals, and an actual data volume which is obtained by analyzing the electronic data in the received data packet by the other video network terminals.
8. The system for synchronized presentation of electronic data according to claim 7, wherein if the parsing result indicates a parsing error, the video network node server further comprises:
the retransmission instruction forwarding module is used for receiving a data packet retransmission instruction from the other video network terminals corresponding to the analysis result and forwarding the data packet retransmission instruction to the first video network terminal, and the first video network terminal is used for sending corresponding data packets to the video network node server according to the data packet retransmission instruction;
and the data packet forwarding module is further configured to send the corresponding data packet to the corresponding other video networking terminal.
9. The system for synchronized display of electronic data according to claim 8, wherein the parsing result represents a parsing error, comprising:
the bearing data volume in the analysis result aiming at the same data packet is different from the actual data volume, and/or the serial number in the analysis result aiming at the same group of data packets is discontinuous;
and the first video network terminal is used for sending the data packets with different bearing data volumes and actual data volumes in the analysis result and/or sending the data packets corresponding to the missing numbers to the video network node server according to the data packet retransmission instruction.
10. A synchronized display system of electronic data according to any one of claims 6 to 9, wherein the data types include at least one of: line type, straight line type, circular type.
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| CN110290106B (en) * | 2019-05-13 | 2022-03-04 | 视联动力信息技术股份有限公司 | Display system |
| CN110445759B (en) * | 2019-07-08 | 2021-08-03 | 视联动力信息技术股份有限公司 | Electronic whiteboard sharing method and device |
| CN110502155B (en) * | 2019-07-16 | 2023-11-21 | 视联动力信息技术股份有限公司 | Display method and device for shared data |
| CN110446002A (en) * | 2019-07-30 | 2019-11-12 | 视联动力信息技术股份有限公司 | A kind of processing method of video conference, system and device and storage medium |
| CN110738882A (en) * | 2019-09-19 | 2020-01-31 | 北京文渊佳科技有限公司 | method, device, equipment and storage medium for on-line teaching display control |
| CN110855626B (en) * | 2019-10-18 | 2022-03-11 | 北京字节跳动网络技术有限公司 | Electronic whiteboard packet loss processing method, system, medium and electronic equipment |
| CN111124333A (en) * | 2019-12-05 | 2020-05-08 | 视联动力信息技术股份有限公司 | Method, device, equipment and storage medium for synchronizing display contents of electronic whiteboard |
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