CN111432149A

CN111432149A - Distributed recording and broadcasting system

Info

Publication number: CN111432149A
Application number: CN202010308675.8A
Authority: CN
Inventors: 古莹莹
Original assignee: Xiamen Tanhong Information Technology Co ltd
Current assignee: Xiamen Tanhong Information Technology Co ltd
Priority date: 2020-04-18
Filing date: 2020-04-18
Publication date: 2020-07-17

Abstract

The invention discloses a distributed recording and broadcasting system which comprises a front-end recording and broadcasting system, a transmission network system and a recording and broadcasting control center, wherein the front-end recording and broadcasting system comprises classroom recording and broadcasting equipment and digital processing equipment, the classroom recording and broadcasting equipment comprises high-definition image acquisition equipment, courseware PC image acquisition equipment and classroom voice acquisition equipment, and the digital processing equipment is used for carrying out digital processing on acquired signals and transmitting the acquired signals to the recording and broadcasting control center through the transmission network system. The invention ensures high-quality video shooting, acquisition, coding compression, live broadcasting and recording through the front-end recording and broadcasting system, the transmission network system is a channel for image transmission of the front-end recording and broadcasting system, the data communication function of the link of the whole system is ensured, and the recording and broadcasting control center can realize centralized supervision and control on the working state of the front-end recording and broadcasting system distributed in a school zone, thereby realizing the functions of course live broadcasting, image transmission, system control and the like and avoiding the bad phenomenon during video recording and broadcasting.

Description

Distributed recording and broadcasting system

Technical Field

The invention relates to the technical field of recording and broadcasting, in particular to a distributed recording and broadcasting system.

Background

With the continuous promotion of modern teaching systems in various colleges and universities, course recording and broadcasting classrooms with conventional recording and broadcasting as a core are increasingly popularized, and in the process of vigorously promoting the education modernization of schools, advanced teaching means are adopted, a brand-new teaching environment is provided to design teaching activities, so that the course recording and broadcasting classroom becomes the mainstream of the teaching development of schools.

With the deepening and popularization of recording and broadcasting classrooms, common multimedia classrooms are more built into conventional course recording and broadcasting classrooms, the number of recording and broadcasting devices in one school or area is continuously increased, and system management becomes a new problem for school management. Although the operation of the single-computer system is simple day by day, the one-key control operation provides a simplest operation tool for a teacher, the automatic tracking recording and broadcasting more saves human resources, and the realization of normalized teaching provides powerful guarantee, unexpected problems such as network problems, system setting problems, equipment state monitoring and other problems related to professional technology always occur in daily use of the system, the teacher usually does not have the capability of solving the problems, recording and broadcasting classrooms are distributed in different school areas of a school, and the found problems are processed again, so that the instant teaching activities are influenced.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a distributed recording and broadcasting system, which solves the traditional problems, manages recording and broadcasting equipment in an area range and avoids the bad phenomenon during video recording and broadcasting.

The invention is realized by adopting the following technical scheme:

a distributed recording and broadcasting system comprises a front-end recording and broadcasting system, a transmission network system and a recording and broadcasting control center, wherein the front-end recording and broadcasting system comprises classroom recording and broadcasting equipment and digital processing equipment which are installed in each classroom, the classroom recording and broadcasting equipment comprises high-definition image acquisition equipment, courseware PC image acquisition equipment and classroom voice acquisition equipment, and the digital processing equipment is used for carrying out digital processing on signals acquired by the high-definition image acquisition equipment, the courseware PC image acquisition equipment and the classroom voice acquisition equipment and transmitting the signals to the recording and broadcasting control center through the transmission network system; the recording and broadcasting control center comprises a streaming media forwarding server, a management server, a storage server and control auxiliary equipment, wherein the streaming media forwarding server, the management server, the storage server and the control auxiliary equipment are in communication connection through a local area network.

Furthermore, the classroom recording and broadcasting equipment comprises an A1 system, an A2 system, an A3 system and an A6 system, wherein the A1 system consists of an A1 recording and broadcasting camera and an A1 omnidirectional microphone; the A2 system consists of an A2 recording and broadcasting host, an A2 high-definition camera, an A2 courseware computer, an A2 omnidirectional microphone and an A2 control panel, and the A3 system consists of an A3 recording and broadcasting host, two A3 high-definition cameras, an A3 courseware computer, two A3 omnidirectional microphones and an A3 control panel; the A6 system consists of four A6 high-definition cameras and a full high-definition automatic tracking recording and broadcasting system.

Furthermore, the streaming media forwarding server, the management server and the storage server all adopt the agreement that different components of the APl system are connected, and the APl system is used for receiving the request and sending the response.

Furthermore, a recording and broadcasting system management platform is installed on the management server, a teaching resource and network teaching and research application platform is installed on the streaming media forwarding server, and the recording and broadcasting system management platform is used for centralized control and management of the front-end recording and broadcasting system; the teaching resource and network teaching and research application platform is used for providing corresponding teaching application service functions.

Furthermore, an external interface of the recording and broadcasting control center adopts a block chain AES algorithm.

Further, the intelligent data packet contract based on the block chain is further included, and the intelligent data packet contract of the block chain is capable of operating an intelligent contract on the network data packet so as to execute intelligent routing and data packet processing to enhance the propagation speed of the network infrastructure on the network platform; the intelligent data packet contract of the block chain consists of an encryption algorithm, a network data packet and a programmable branch block chain.

Furthermore, the distributed recording and broadcasting system realizes dynamic network adjustment through an intelligent data packet contract and a programmable branch block chain, constructs a mesh network, and enables user equipment to provide functions of switching, routing and data packet processing, thereby realizing decentralized network infrastructure.

Furthermore, an automatic identity recognition system is further installed on the external device of the recording and broadcasting control center and used for automatic identity recognition between the user and the school user management system, and single sign-on is achieved.

Further, the transmission network system is composed of a network switch, a router and an IP special transmission device.

Further, the control accessory device includes a control client PC and a sub-control client PC.

Compared with the prior art, the invention has the beneficial effects that:

the invention sets a front-end recording and broadcasting system, a transmission network system and a recording and broadcasting control center, the front-end recording and broadcasting system ensures high-quality video shooting, acquisition, coding compression, live broadcasting and recording, the transmission network system is an image transmission channel of the front-end recording and broadcasting system, the data communication function of the whole system link is ensured, and the recording and broadcasting control center can realize centralized supervision and control on the working state of the front-end recording and broadcasting system distributed in a school district, thereby realizing the functions of course live broadcasting, image transmission, system control and the like and avoiding the bad phenomenon during video recording and broadcasting.

The invention improves the management mode of the recording and broadcasting classroom from a distributed management mode to a centralized management mode, uses technical means to carry out centralized system management on recording and broadcasting classrooms distributed in various places of a study area under the condition of keeping the existing operation mode unchanged, monitors the live broadcast video and the working state of equipment in each recording and broadcasting classroom through network technology, timely masters the working condition of each classroom system, and prompts system managers to timely process the system abnormal in working through manual and automatic alarm prompting means, thereby improving the working efficiency of the operation and maintenance management of the recording and broadcasting system.

The invention adopts the disaster recovery strategy of synchronously recording the two local videos, protects the video data of all users safely, reliably and completely, does not influence the recording of the training course training in progress when the network is interrupted, can quickly and accurately recover the application of live broadcast on demand and the like after the network is recovered to be normal, and recovers the synchronization of the videos of the management center system and the videos of the SEN integrated distributed recording and broadcasting host in the classroom in proper strategy management.

The front-end signal acquisition of the invention can conveniently connect various videos and audios, meet different use environments, expand a network video monitoring system, support live broadcast and recording of multi-channel videos, simultaneously broadcast different teaching courses, conferences, training and reports without mutual influence, and realize graded viewing and strong confidentiality.

The invention dispersedly stores videos made by schools in various systems, a shared database is arranged among schools, and data or information stored in the shared database has the characteristics of 'unforgeability', 'whole-course trace', 'traceability', 'public transparency', 'collective maintenance' and the like, and the block chain technology of a novel application mode of computer technologies such as distributed data storage, point-to-point transmission, a consensus mechanism, an encryption algorithm and the like realizes data interconnection and intercommunication between schools and regions, so that a large amount of high-quality resources are shared and realize real value, and excellent resources in the regions play a role in improving the education level of the whole region.

Drawings

Fig. 1 is a schematic diagram of a distributed recording and broadcasting system of the present invention;

FIG. 2 is a schematic connection diagram of the A1 system;

FIG. 3 is a schematic connection diagram of the A2 system;

FIG. 4 is a schematic connection diagram of the A3 system;

FIG. 5 is a schematic connection diagram of the A6 system;

FIG. 6 is a schematic diagram illustrating data encryption of the external interface according to the present invention;

FIG. 7 is a schematic diagram of the architecture of the teaching resources and the network teaching and research application platform according to the present invention;

FIG. 8 is a path diagram of the AES256 algorithm technology interface implementation of the present invention;

FIG. 9 is a diagram of the processing of data packets using a blockchain intelligent contract in accordance with the present invention.

Detailed Description

The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

Please refer to fig. 1, which is a schematic diagram of a distributed recording and broadcasting system of the present invention, the distributed recording and broadcasting system includes a front-end recording and broadcasting system, a transmission network system and a recording and broadcasting control center, the front-end recording and broadcasting system includes classroom recording and broadcasting equipment and a digital processing equipment, the classroom recording and broadcasting equipment includes a high-definition image acquisition equipment, a courseware PC image acquisition equipment and a classroom voice acquisition equipment, the digital processing equipment is used for digitally processing signals acquired by the high-definition image acquisition equipment, the courseware PC image acquisition equipment and the classroom voice acquisition equipment, and transmitting the signals to the recording and broadcasting control center through the transmission network system; the recording and broadcasting control center comprises a streaming media forwarding server, a management server, a storage server and control auxiliary equipment, wherein the streaming media forwarding server, the management server, the storage server and the control auxiliary equipment are in communication connection through a local area network.

Specifically, the front-end recording and broadcasting system is formed by integrating an A recording and broadcasting classroom, a B recording and broadcasting classroom, a C recording and broadcasting classroom, an … … N recording and broadcasting classroom and the like distributed in all school districts of a school, high-definition images of the class room scene are collected through high-definition image collecting equipment, courseware PC images of the class room scene are collected through courseware PC image collecting equipment of the class room scene, classroom voices of the class room scene are collected through classroom voice collecting equipment, collected signals are digitally processed through digital processing equipment, and finally, the codes are output. The classroom recording and broadcasting equipment can be configured according to the use requirements of users, and specifically, the classroom recording and broadcasting equipment comprises an A1 system, an A2 system, an A3 system and an A6 system, wherein the A1 system consists of an A1 recording and broadcasting camera and an A1 omnidirectional microphone, the A1 recording and broadcasting camera is internally provided with a recording and broadcasting encoder, for example, as shown in FIG. 2, the audio output by the A1 omnidirectional microphone is directly input to the audio input end of the camera and is output by mixed encoding of the built-in encoder, the A1 system has simple functional requirements, and the A1 system can be selected if only the scene images of teachers who live in class are required.

The A2 system comprises an A2 recording and broadcasting host, an A2 high-definition camera, an A2 courseware computer, an A2 omnidirectional microphone and an A2 control panel, as shown in FIG. 3, the A2 high-definition camera is connected to the A2 recording and broadcasting host, the A2 control panel controls the A2 control panel to record and broadcast high-definition video images, voice signals of teachers and students can be collected through the A2 omnidirectional microphone and directly input to the A2 recording and broadcasting host, and the A2 courseware computer is directly input to the A2 recording and broadcasting host.

The A3 system consists of an A3 recording and broadcasting host, two A3 high-definition cameras, an A3 courseware computer, two A3 omnidirectional microphones and an A3 control panel; as shown in fig. 4, 2 A3 high-definition cameras are connected to an A3 high-definition recording and broadcasting host, and are controlled by an A3 control panel to record and broadcast high-definition video images, and voice signals of teachers and students are collected by two A3 omnidirectional microphones and directly input to the A3 recording and broadcasting host.

The A6 system comprises four A6 high-definition cameras and a full high-definition automatic tracking recording and broadcasting system, the full high-definition automatic tracking recording and broadcasting system comprises an A6 recording and broadcasting host, an A6 image recognition and tracking host, an A6 digital audio processor and an A6 broadcasting guide system, as shown in figure 5, the 4 high-definition cameras are connected to the high-definition recording and broadcasting host, local control is operated through a central control panel or broadcasting guide software, and recording and live broadcasting of high-definition image videos are achieved. The pictures shot by the 3 image tracking cameras are connected to the tracking host as image positioning signals, and control signals are output to the recording and broadcasting host through analysis and processing of the tracking host, so that the functions of camera tracking and image switching are realized. The voice signals of teachers and students are collected through a collar clamp microphone and a suspended ceiling pickup microphone, input into a digital audio matrix processor, and output 2 paths of audio through balancing, noise reduction and sound mixing processing, wherein 1 path of audio provides a recording level signal for a recording and broadcasting host, the other path of audio outputs to an audio power amplifier, and after power amplification, a sound box is used for sound amplification, so that field sound amplification is realized.

The streaming media forwarding server, the management server and the storage server are all in agreement of connection of different components of an APl system, and the APl system is used for receiving requests and sending responses to complete functions of live broadcast, uploading, recording, on-demand playing, management and the like of the front-end recording and playing system on classroom videos. In one embodiment, a recording and broadcasting system management platform is installed on the management server, a teaching resource and network teaching and research application platform is installed on the streaming media forwarding server, and the recording and broadcasting system management platform is used for centralized control and management of the front-end recording and broadcasting system; the teaching resource and network teaching and research application platform is used for providing corresponding teaching application service functions.

Preferably, the external interface of the recording and playing control center is encrypted by adopting a block chain AES (Advanced encryption standard) algorithm, and is used for encryption docking between system platforms and data security transmission.

In one embodiment, the encryption method of the block chain AES algorithm is as follows: and dividing the plaintext into a plurality of groups of data, wherein each group of data has the same length, and encrypting one group of data each time until the whole plaintext P is encrypted.

As shown in fig. 6, the data transmission steps of the external interface are as follows:

a plaintext and an encryption key of a port A (a sender) are used as parameters to be input into an encryption function, the encryption function encrypts and outputs a ciphertext, the ciphertext is transmitted to a port B through a network, the port B (a receiver) inputs the ciphertext and a decryption key into a decryption function by using the parameters, and the plaintext is output after the decryption function decrypts.

Wherein, the plaintext is data which is not encrypted; a cipher used by the encryption key to encrypt plaintext; the ciphertext is the data processed by the encryption function; the encryption function is an algorithm for encrypting a plaintext; the decryption function is an algorithm for decrypting the ciphertext.

The key is generated by the negotiation between the receiving party and the sending party, but cannot be directly transmitted on the network, otherwise, the key can be leaked, and the key is usually encrypted through an asymmetric encryption algorithm and then transmitted to the opposite party through the network, or the key is directly subjected to face-to-face trading. The key is absolutely not leaked, otherwise, an attacker can restore the ciphertext and steal the confidential data. AES encryption function: assuming the AES encryption function is E, C is E (K, P), where P is plaintext, K is a secret key, and C is ciphertext. That is, the encryption function E outputs the ciphertext C by inputting the plaintext P and the key K as parameters of the encryption function. AES decrypt function: let AES decrypt function be D, then P ═ D (K, C), where C is ciphertext, K is secret key, and P is plaintext. That is, the ciphertext C and the key K are input as parameters of the decryption function, and the decryption function outputs the plaintext P.

In one embodiment, the encryption key has a length of one of 128 bits, 192 bits, or 256 bits, and the decryption key is the same as the encryption key.

The interface encryption steps are as follows: when a mobile terminal of a receiver requests an interface, a sender submits data to the interface through POST, then parameters required by the interface are spliced into an array, and then the array json _ encode is processed; after being encrypted, the data are assembled into data and transmitted to an interface.

The check value generation steps are as follows: assembling parameters required by an interface into an array; after the interface parameters are sorted, Key _ value is spliced into a character string arr ═ array ('a' ═ 1, 'b' ═ 2); a1b2 after assembly; string MD5 to be spliced; the encrypted MD5 value is passed as a parameter to the requesting interface.

The generating step of the check value is used for checking the request parameters, the interface needs to sequence the parameters when receiving the parameters, MD5 checking is performed after json, the interface parameters do not require to be in a document sequence, the check value needs to be sequenced and then MD5 encryption is performed, so that truncation and tampering in the transmission process are prevented, and the interface does not enforce to check the parameter sequence.

An example of the use of the AES encryption algorithm API is provided below:

an API is provided for programming calls to encrypt and decrypt verifications using the ecb model of the 128-bit aes algorithm, as shown below

The first method, calling directly using api provided by aes algorithm, code is as follows

The result of compilation execution is as follows

Second method, using an EVP framework, is exemplified below

The compilation execution results are as follows:

in one embodiment, an automatic identity recognition system is further installed on the external device of the recording and broadcasting control center, and is used for automatic identity recognition between the user and the school user management system, so that single sign-on is realized. It can be understood that the streaming media forwarding server is provided with an automatic identity recognition system, so that a data interface of a shared platform, namely a teaching resource and a network teaching and research application platform, realizes single sign-on, i.e. only one platform needs to log on to enter other platforms without logging on, thereby avoiding secondary login, supporting data statistics and monitoring, identity recognition, data return and operation return. The recognized teaching and learning states of the user in the school and the generated data are automatically transmitted back to the sharing platform. One school can be directly deployed singly, and the integration of a plurality of schools with a district-level platform and a city-level platform can be realized only by simple configuration at the later stage, and single sign-on is realized (namely, only one platform is required to log on, the single sign-on can be prevented from entering other platforms); when the combined school wants to be separated from the combined resource platform, the combined school can also be configured with a website to be separated, and the platform can be switched between independent use and combined sharing.

The teaching resource and network teaching and research application platform can undertake the functions of user management, resource management, application management, integration, butt joint management and the like, undertake the centralized management of the education bureau on users, resources and equipment in the whole city, provide resource services, teaching and research applications and the like based on the city education cloud architecture for each unit such as towns, schools, teachers and the like, and meet the application requirements of different clients, and comprise terminals such as a PC (personal computer), a notebook, an IOS (input output operating system) mobile terminal and an ANDROID (ANDROID integrated electronic) mobile terminal, such as the schematic architecture diagram of the teaching resource and network teaching and research application platform shown in fig. 7.

The teaching resource and the network teaching and research application platform simultaneously consider the integration with a national unified cloud platform and other application systems of education informatization in the construction of a three-way platform in the future, the platform design conforms to the basic education teaching resource metadata specification (CE L TS-42) of the education department, the seamless connection with various school resource platforms built in a domestic unified way is ensured, and corresponding integration access interfaces are reserved.

The invention discloses an automatic identity identification system, which adopts an AES256 algorithm to realize identity authentication, namely an AES algorithm interface, because a block chain asymmetric algorithm is slower in large-scale data processing, and a recorded and broadcast video generates conflict points, the AES algorithm has the characteristics of high decryption speed, parallel operation, easy transmission and the like, and can be grouped into a streaming mode, and can be used when the communication channel quality is not high, such as satellite communication, the defects of relatively simple encryption, incapability of hiding a plain text mode (such as an image encryption contour is still), and easiness in active attack, if the plain text is changed, errors can occur in transmission, the invention adopts a streaming technology completely, does not transmit data, cannot cause data leakage, adopts 256 secret bits, increases the decryption difficulty, if a network data packet can be analyzed by utilizing an intelligent data packet contract to capture suspicious UR L, the possibility of preventing the attack, the intelligent data packet can be integrated, the decentralized network management can also be promoted, for example, the decentralized network packet can be merged by re-routing the data packet between network nodes, so as to realize better load balance, finally, a multi-level merging and a multi-level token-level merging and expansion platform can be realized by utilizing a decentralized network infrastructure design, a single-level token-based on-merging and a single-level merging platform, which is only a single-level merging and a single-level merging platform, which is needed, and a system design, and a system can be realized by utilizing a system, which is capable of a system, and a system:

when a user logs in the "experimental space" and clicks [ i want to do an experiment ], the "experimental space" will provide Token in a parametric form. The XJWT standard is used in the experimental space user verification, and the standard is developed based on JSON Web Token (JWT). XJWT contains three parameters: the header, payload, signature, and hence token generation, are first to obtain these three parameters.

The user verifies the composition structure of the token: base64(raw header) + '+ base64(raw payload) +' + base64(raw signature)

token composition parameters include header, payload, and signature.

The header comprises the following structure: [ expire: long ] [ type: byte ] [ issuer id: long ].

payload is an integer multiple of 64 bytes. The structure is as follows: AES256(random long + body + aesplating, AES key). Wherein: AES256 is the AES256 encryption algorithm; random long is a random 8byte number; aesoadding is a self-defined character string and is an integer multiple of 64 bytes; the aes key is generated from the 'experiment space' and distributed to each experimental teaching item. body is a JSON format string encoded by UTF 8.

The composition structure of signature: base64(HmacSHA256(base 64(raw header) +' + base64(raw payload), secret key)).

Wherein: the raw header is the header generated in the above; raw payload is the payload generated in the above; secret key is the password that generates the aes key, provided by the "lab space".

And (3) verification and decryption: the signature is decoded using base64, verified by secret key, and if the verification fails, token fails. Decoding the header by using base64, comparing the obtained expiration time (expire) with the current time, and if the expiration time is expired, the token is invalid; token fails if the header type is not provided; decoding by using base64 and decrypting by using aes key, discarding the previous 8byte and aes padding data of the obtained data, and returning the rest data json. After user data is obtained by each experimental teaching project, the user data can be stored by self.

And (3) verifying interface development specifications: when the user directly accesses each experimental teaching project, the token fails, the user is in a non-login state to access each experimental teaching project, or the experimental teaching project adopts a C/S architecture mode, the third party access terminal can develop an interface which can use an experimental space user name and a password to obtain the basic information of the user according to a given login interface form.

It is necessary to send data to the http:// www.ilab-x.com/sys/api/user/valid service for login.

Interface name: http:// www.ilab-x.com/sys/api/user/validate

The calling method comprises the following steps: and (6) GET.

The return data interface means: and (3) generating experimental result data after the experiment space user finishes the experiment teaching project. If the experiment report exists, the attachment uploading interface is called, and then the data and the user information are synchronized to the experiment space through the return data interface.

Experiment operation state feedback interface: the interface is suitable for the situation that a user enters a third-party experiment platform from an experiment space platform to start to do experiment teaching projects. When the user operates, the third-party platform can call the interface to finish data returning of the experimental operation state.

In one embodiment, a developer of intelligent data packet contracts with blockchain can run intelligent contracts on network data packets to perform intelligent routing and packet processing (see FIG. 9) to provide a platform on which to create decentralized network applications using intelligent data packet contracts.

Example applications include Software Defined Networking (SDN), intrusion detection and prevention systems (IDS/IPS), anti-malware and anti-virus protection, Content Delivery Networks (CDNs), Virtual Private Networks (VPNs), and new blockchain protocols. The application adopts a 'picture complete' language, can access a network data packet and is compiled downwards into byte codes. Three layers of APIs are also provided in the network library: a control API for affecting the operation of routing and communication flows, a content API for checking payload, etc., and an intelligent API for pattern analysis and machine learning. And after the writing is finished, the application is deployed to the global block chain.

Since applications may perform low-level packet processing on a large amount of network traffic through the virtual machine layer, heavy-weight processing such as pattern analysis is performed at a location outside the critical path by cloning and batching the traffic. For high throughput real-time processing, the concept of acceleration by custom hardware is considered a long-term solution. Another important objective affecting intelligent data container contract design is compatibility with existing open source items in this field (e.g., hot network intrusion detection and intrusion prevention systems Snort).

The ethernet is protected using packet level encryption.

Existing network infrastructure is enhanced through intelligent packet contracts and programmable branch blockchains, dynamic network tuning, and novel security and network applications are achieved.

By encouraging the formation of mesh networks, user equipment is enabled to provide switching, routing and packet processing functions, thereby enabling decentralization of network infrastructure.

A branching chain is a generic construct by which a new blockchain is programmatically created that connects to and runs in parallel with a global chain. Each branching chain has its own custom rules specified by a branching contract. Thereby making the branch chain a flexible primitive that can be used. An example of this is mesh chain, which is a branched chain that corresponds to a set of nodes that have been determined to be bound together to form a mesh network. These nodes are typically (but not always) located in close proximity. Thus, there may be many different mesh chains, divided into two categories: public (any node can contribute resources) and private (e.g., an enterprise network). The purpose of the mesh chains is to break the mesh network from global chains, thereby improving the reliability and scalability of the network.

To connect mesh chains, a node must first register its public key and public key hash on the global chain. In this way, the node can participate in intelligent contracts and transmissions. Next, the node needs to determine the mesh network to connect to. There are two ways of determination: propagate to neighboring nodes to obtain their IP addresses and query a Distributed Hash Table (DHT) maintained by all network nodes that maps mesh network IDs to a list of IP addresses within each mesh network. Knowing this information, the nodes can register themselves on the local mesh chain, and this registration transaction requires the peripheral node signatures to indicate that they can connect to the new node.

The blockchain data packet intelligent contract provides the following four aspects of applications:

① secure field networks, by using blockchain intelligent data contracts, multiple secure field networks can be deployed quickly in a battlefield or disaster relief environment and their communication traffic histories stored in an account book for auditing after network retirement.

② Internet of things (IoT) device management, with the increase in the number and functionality of IoT devices, the number of applications they can support will increase and the need for secure communications between devices will increase through networks and their smart package contracts, these devices can interoperate securely and properly and cooperate as needed to solve complex problems, leveraging locally available hardware in modern variants of distributed grid computing.

③ content distribution networks (CDN or dCDN) that can cache large or popular Internet content through nodes in the network, provide that content to consumers in a more convenient local manner, thereby making more efficient use of bandwidth and improving latency.

④ Software Defined Networking (SDN) that manages and controls computers through distributed network virtualization, in which network hardware can be dynamically reconfigured and reprogrammed from one console, e.g., to start new nodes for load balancing or traffic shaping.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. A distributed recording and broadcasting system is characterized by comprising a front-end recording and broadcasting system, a transmission network system and a recording and broadcasting control center, wherein the front-end recording and broadcasting system comprises classroom recording and broadcasting equipment and digital processing equipment which are installed in each classroom, the classroom recording and broadcasting equipment comprises high-definition image acquisition equipment, courseware PC image acquisition equipment and classroom voice acquisition equipment, and the digital processing equipment is used for carrying out digital processing on signals acquired by the high-definition image acquisition equipment, the courseware PC image acquisition equipment and the classroom voice acquisition equipment and transmitting the signals to the recording and broadcasting control center through the transmission network system; the recording and broadcasting control center comprises a streaming media forwarding server, a management server, a storage server and control auxiliary equipment, wherein the streaming media forwarding server, the management server, the storage server and the control auxiliary equipment are in communication connection through a local area network.

2. The distributed recording and broadcasting system according to claim 1, wherein the classroom recording and broadcasting equipment comprises a1 system, a2 system, A3 system and a6 system, the a1 system is composed of a1 recording and broadcasting camera and a1 omnidirectional microphone; the A2 system consists of an A2 recording and broadcasting host, an A2 high-definition camera, an A2 courseware computer, an A2 omnidirectional microphone and an A2 control panel, and the A3 system consists of an A3 recording and broadcasting host, two A3 high-definition cameras, an A3 courseware computer, two A3 omnidirectional microphones and an A3 control panel; the A6 system consists of four A6 high-definition cameras and a full high-definition automatic tracking recording and broadcasting system.

3. The distributed recording and broadcasting system of claim 1, wherein the streaming media forwarding server, the management server, and the storage server are all engaged by different components of an APl system, and the APl system is used for receiving requests and sending responses.

4. The distributed recording and broadcasting system according to claim 1, wherein a recording and broadcasting system management platform is installed on the management server, a teaching resource and network teaching and research application platform is installed on the streaming media forwarding server, and the recording and broadcasting system management platform is used for centralized control and management of the front-end recording and broadcasting system; the teaching resource and network teaching and research application platform is used for providing corresponding teaching application service functions.

5. The distributed recording and broadcasting system according to claim 1, wherein the external interface of the recording and broadcasting control center employs a block chain AES algorithm.

6. The distributed recording and broadcasting system according to claim 1, further comprising a blockchain-based intelligent data packet contract, the blockchain intelligent data packet contract being capable of running an intelligent contract on network data packets to perform intelligent routing and data packet processing to enhance the propagation speed of network infrastructure on a network platform; the intelligent data packet contract of the block chain consists of an encryption algorithm, a network data packet and a programmable branch block chain.

7. The distributed recording and broadcasting system of claim 6, wherein the distributed recording and broadcasting system implements dynamic network adjustment through intelligent packet contracts and programmable branch block chains to build a mesh network, so that the user equipment provides switching, routing and packet processing functions, thereby implementing decentralized network infrastructure.

8. The distributed recording and broadcasting system of claim 1, wherein an automatic identification system is further installed on the external device of the recording and broadcasting control center, and is used for automatic identification between the user and the school user management system, so as to realize single sign-on.

9. The distributed recording and broadcasting system according to claim 1, wherein the transmission network system is composed of network switches, routers and IP-dedicated transmission equipment.

10. The distributed recording and broadcasting system according to claim 1, wherein said control-attached device includes a control client PC and a sub-control client PC.