Audio and video transmission system and method

Abstract

According to the audio and video transmission system and method provided by the invention, the corresponding target audio and video can be selected according to the operation instruction generated by the user operation, so that the flexibility of audio and video scheduling is improved; besides, in the system, the video display device and the instruction control device are physically isolated from each other, an operation instruction is transmitted through the instruction control device and the instruction transmission device, transmission of target audio and video is achieved through the video collection device and the video display device, and the transmission directions of the two links are different. And the operation instruction and the target audio / video can only be transmitted unidirectionally, so that uplink and downlink paths can be prevented from being formed at the same time, and the safety of the system is ensured.

Description

Technical Field

[0001] This invention relates to the field of audio and video technology, and in particular to an audio and video transmission system and method. Background Technology

[0002] With the continuous development of information technology, various industries are increasingly demanding rich media applications for command and control, as well as industry management. Command, management, and decision-making applications are no longer satisfied with traditional data, charts, and text; there is a growing call for incorporating real-time audio and video into management and decision-making. Therefore, aggregating and displaying audio and video resources from various networks has become an indispensable requirement in application scenarios. In low-density application scenarios, audio and video aggregation across different networks only requires network connectivity and the use of standard audio and video protocols. However, for special industries with high network security requirements or strict classification levels, traditional solutions are completely ineffective. Currently, the industry's demand for transmitting video from low-density networks to high-density networks focuses on three main dimensions: security compliance, real-time decision-making, and risk control. One existing solution is a localized audio and video encoding / decoding solution with secondary networking, which offers poor flexibility in audio and video scheduling. Another solution is a one-way optical gateway or network gateway solution, but the switching mechanism is still implemented in code, theoretically posing a potential risk of exploitation by high-end attacks, resulting in poor system security. Summary of the Invention

[0003] The purpose of this invention is to provide an audio and video transmission system and method to improve the flexibility of audio and video scheduling while enhancing system security.

[0004] This invention provides an audio and video transmission system, comprising: a video acquisition device, an instruction transmission device, and a video display device and an instruction control device that are physically isolated from each other; the instruction control device is used to generate an operation instruction in response to a user operation and send the operation instruction to the instruction transmission device; the instruction transmission device is used to send the operation instruction unidirectionally to a first terminal using a first transmission mode, so that the first terminal determines the target audio and video according to the operation instruction, and then sends the target audio and video unidirectionally to the video acquisition device using a second transmission mode; the video acquisition device is used to encode the target audio and video to obtain an encoded audio and video signal and send the encoded audio and video signal to the video display device; the video display device is used to transmit the target audio and video unidirectionally to a second terminal based on the encoded audio and video signal using the second transmission mode; wherein the second terminal and the first terminal belong to different network environments.

[0005] Furthermore, the system also includes: a resource mirroring device; a video display device for sending encoded audio and video signals to the resource mirroring device using a second transmission mode; and a resource mirroring device for decoding the encoded audio and video signals to obtain the decoded target audio and video, and transmitting the target audio and video to a second terminal.

[0006] Furthermore, the resource mirroring device is used to isolate the network environment to which the second terminal belongs from the network environment to which the first terminal belongs.

[0007] Furthermore, the first transmission mode is a one-way serial port transmission method.

[0008] Furthermore, the second transmission mode is HDMI unidirectional fiber optic transmission.

[0009] Furthermore, the operation instructions are coordinate data of keyboard and mouse operations that simulate user operations.

[0010] Furthermore, the network environment to which the second terminal belongs is at a higher level than the network environment to which the first terminal belongs.

[0011] Furthermore, the system includes multiple sets of video acquisition devices and command transmission devices; the video acquisition devices in each set are communicatively connected to the video display devices; and the command transmission devices in each set are communicatively connected to the command control devices.

[0012] Furthermore, each set of video acquisition devices and command transmission devices has its own corresponding first terminal.

[0013] This invention provides an audio and video transmission method, comprising: a command control device responding to a user operation, generating an operation command, and sending the operation command to a command transmission device; the command transmission device using a first transmission mode to unidirectionally send the operation command to a first terminal, so that the first terminal determines the target audio and video according to the operation command, and using a second transmission mode to unidirectionally send the target audio and video to a video acquisition device; the video acquisition device encoding the target audio and video to obtain an encoded audio and video signal, and sending the encoded audio and video signal to a video display device; the video display device using the second transmission mode to unidirectionally transmit the target audio and video to a second terminal based on the encoded audio and video signal; wherein the second terminal and the first terminal belong to different network environments.

[0014] The audio and video transmission system and method provided by this invention can select the corresponding target audio and video according to the operation instructions generated by the user, thereby improving the flexibility of audio and video scheduling. In addition, in this system, the video display device and the command control device are physically isolated from each other. The operation instructions are transmitted through the command control device and the command transmission device, and the target audio and video are transmitted through the video acquisition device and the video display device. The transmission directions of the two links are different, and the operation instructions and the target audio and video can only be transmitted unidirectionally, thereby avoiding the simultaneous formation of uplink and downlink paths and ensuring the security of the system. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A schematic diagram of an audio / video transmission system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the business process of an audio and video transmission system provided in an embodiment of the present invention. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Currently, there is a growing call for incorporating real-time audio and video into management decision-making. Therefore, the aggregation and display of audio and video resources from various networks has become an indispensable requirement in application scenarios. Based on this application need, how to aggregate audio and video resources from different types and networks into a single network and application has become a pressing technical challenge. In low-security application scenarios, the aggregation of audio and video resources from different networks only requires network connectivity and the use of standard audio and video protocols. However, for special industries with high network security requirements or strict classification levels, traditional solutions are completely ineffective. The practical management needs of different security levels represent a significant technical gap that needs to be addressed in cross-network audio and video aggregation. Currently, the industry's demand for transmitting video from low-security networks to high-security networks focuses on three main dimensions: security compliance, real-time decision-making, and risk control, covering key sectors such as military, energy, public safety, and finance.

[0019] To address the application needs of actual business scenarios, the following are common existing technical solutions: I. A solution employing a grounded audio / video codec and secondary networking approach for connection: Step 1, Decoding and Deployment: This refers to the process where an incoming video stream enters a dedicated, isolated video access area (or "transfer zone") from its source network (such as the Internet). This video access area typically consists of one or more high-performance decoders and is physically or logically isolated from the internal core network. Full Decoding: The server in the video access area receives the incoming video stream and performs full decoding. This incoming video stream may be based on protocols such as RTSP (Real-Time Streaming Protocol), RTMP (Real-Time Messaging Protocol), GB / T28181, or Onvif (Open Network Video Interface Forum). This process restores the compressed bitstream (such as H.264, H.265) to its original, uncompressed raw video and audio data. The raw video data can be in formats such as YUV (Yellow, Umbra, Value, a color encoding format), and the raw audio data can be in formats such as PCM (Pulse Code Modulation).

[0020] "Data Implementation": The decoded raw data is temporarily stored in the memory of the server in the video access area. At this point, any potentially hidden data, malicious code, protocol header information, etc., contained in the raw bitstream have been completely stripped away and discarded. This is equivalent to leaving only the purest "image" and "sound" themselves.

[0021] The second step is re-encoding: The server in the video access area uses the video encoding standard required by the internal network (such as the internally unified requirement of H.264) to recompress and encode the original raw video and audio data, generating a completely new, clean video stream produced by the internal system itself. This completely cuts off any digital attack path from the external network. Even if a Trojan or virus is implanted in the external video stream, this malicious code cannot survive the decoding and re-encoding process. It achieves not just simple protocol filtering, but the "purification" and "regeneration" of content.

[0022] The third step, secondary networking: "Secondary" refers to the second generation of the network stream. The first generation occurs on the external network, while the second generation takes place within a secure internal video access zone. The re-encoded, "clean" video stream is then re-streamed or provided to the core platform of the internal network (such as a video sharing platform, video parsing platform, or practical application platform) using protocols specified by the internal network, such as GB / T28181, RTSP, RTMP, or FLV (Flash Video, a streaming media format). When a client or platform on the internal network requests to watch this video, it no longer connects to an insecure external source, but rather to the video stream address provided by this secure video access zone. From the internal network's perspective, all videos originate from this trusted, internal video access zone.

[0023] This solution has the following main objective drawbacks: 1. Limited construction distance and high transmission costs; 2. The number of access sources requires the configuration of corresponding equipment, resulting in heavy construction and management costs on a large scale; 3. It cannot be flexibly scheduled or adjusted. When updating the content, it is necessary for both parties to communicate offline and make manual adjustments. 4. The encoding and decoding process introduces a certain processing delay (usually ranging from hundreds of milliseconds to several seconds), which needs to be optimized for application scenarios with extremely high real-time requirements (such as real-time command). 5. Video quality loss: In theory, decoding and re-encoding (which is a lossy compression) will result in a generation of video quality loss, and the impact needs to be minimized by configuring high bitrates and other methods.

[0024] II. One-way optical shutter and network gateway solutions: The network gateway employs a "switch-off" mechanism. It consists of internal and external network processing units and a dedicated switching system. Its principle is as follows: 1) Disconnect from external network: The external network unit receives external data and then immediately disconnects from the external network.

[0025] 2) Data stripping and review: Extract application layer data (such as video stream data packets) from the TCP / IP (Transmission Control Protocol, or TCP for short; Internet Protocol, or IP for short) protocol and perform security reviews (such as virus scanning and content filtering).

[0026] 3) Internal transfer: The "cleaned" data is transferred to the intranet unit via a dedicated internal bus (non-TCP / IP).

[0027] 4) Rebuild intranet connection: The intranet unit receives data, repackages it into a new TCP / IP packet, and sends it to the intranet server from a completely new connection.

[0028] The methods for video capture are as follows: 1) The network gateway can directly handle TCP / UDP (User Datagram Protocol) protocols, thus making it more flexible in adapting to video streams.

[0029] 2) Protocol proxy: Configure video stream proxy function on the gateway.

[0030] 3) External network side: The external network unit of the gateway actively pulls or receives external video streams.

[0031] 4) Transfer and Reconstruction: After the network gateway strips and performs security checks on the video stream data, it transfers it to the internal network unit.

[0032] 5) Internal Network Side: The internal network unit of the gateway acts as a new video stream source, pushing the video stream to the internal video platform. From the perspective of the internal network platform, the video stream appears to be sent directly from the gateway, this "security device".

[0033] This solution has the following main objective drawbacks: 1. Slightly higher security risk: Although the TCP / IP connection is isolated, its ferry mechanism is still implemented by code, which theoretically poses a potential risk of being exploited by high-end attacks (such as "ferry attacks"), and its security is not as good as physical one-way; 2. One-way optical shutters and network gateways can only be used for one-way, non-interactive network data transmission. They cannot be used for video systems that require bidirectional interaction to acquire video data in actual use. 3. Performance bottleneck: The throughput of the gateway is a key indicator. A large number of high-definition video streams may become its performance bottleneck, requiring a high-performance model.

[0034] Based on this, embodiments of the present invention provide an audio and video transmission system and method, which can be applied to scenarios requiring secure transmission of audio and video.

[0035] To facilitate understanding of this embodiment, an audio and video transmission system disclosed in this embodiment of the invention will first be introduced, such as... Figure 1 As shown, the system includes: a video acquisition device 10, an instruction transmission device 11, and a video display device 12 and an instruction control device 13 that are physically isolated from each other. That is, there is no direct electronic connection path between the video display device 12 and the instruction control device 13, achieving absolute physical isolation. The video display device 12 is connected to the video port of the video acquisition device 10, and the instruction control device 13 is connected to the instruction port of the instruction transmission device 11.

[0036] The instruction control device 13 is used to generate an operation instruction in response to a user operation and send the operation instruction to the instruction transmission device 11. In actual implementation, the user can generate an operation instruction by operating on the instruction control device 13 and send the operation instruction to the instruction transmission device 11 through the instruction control device 13.

[0037] The instruction transmission device 11 is used to send operation instructions unidirectionally to the first terminal using a first transmission mode, so that the first terminal determines the target audio and video according to the operation instructions, and then sends the target audio and video unidirectionally to the video acquisition device 10 using a second transmission mode. The first transmission mode can be used to ensure the unidirectional transmission of operation instructions. The first terminal can be a network video terminal, a computer terminal, etc. The second transmission mode can be used to ensure the unidirectional transmission of target audio and video. In actual implementation, the instruction transmission device 11 can use the first transmission mode to send operation instructions to the first terminal, and the first terminal can play and display the corresponding external network business system audio and video, i.e., the target audio and video, according to the operation instructions, and then output it to the video acquisition device 10 using the second transmission mode.

[0038] The video acquisition device 10 is used to encode the target audio and video to obtain an encoded audio and video signal, and then send the encoded audio and video signal to the video display device 12. After receiving the target audio and video, the video acquisition device 10 can encode it into a network video signal, namely the aforementioned encoded audio and video signal, and send it to the video display device 12 through a one-way video network.

[0039] The video display device 12 is used to unidirectionally transmit target audio and video signals to a second terminal based on encoded audio and video signals using a second transmission mode; wherein the second terminal and the first terminal belong to different network environments. After receiving the encoded audio and video signals, the video display device 12 can unidirectionally transmit the corresponding target audio and video signals to the second terminal based on the encoded audio and video signals. In this embodiment, the first terminal and the second terminal belong to different network environments, that is, through this embodiment, cross-network isolated and secure transmission of audio and video resources can be achieved.

[0040] The aforementioned audio and video transmission system can select the corresponding target audio and video based on the operation commands generated by the user, thus improving the flexibility of audio and video scheduling. In addition, in this system, the video display device and the command control device are physically isolated from each other. The operation commands are transmitted through the command control device and the command transmission device, and the target audio and video are transmitted through the video acquisition device and the video display device. The two links have different transmission directions, and both the operation commands and the target audio and video can only be transmitted unidirectionally, thereby avoiding the formation of uplink and downlink paths at the same time and ensuring the security of the system.

[0041] Furthermore, the system also includes: a resource mirroring device; a video display device for sending encoded audio and video signals to the resource mirroring device using a second transmission mode; and a resource mirroring device for decoding the encoded audio and video signals to obtain the decoded target audio and video, and transmitting the target audio and video to a second terminal.

[0042] In practical implementation, the video display device can adopt the second transmission mode to connect the encoded audio and video signals to the resource mirroring device, so as to decode the encoded audio and video signals to obtain the target audio and video, and then stream the target audio and video to the second terminal.

[0043] Furthermore, the resource mirroring device is used to isolate the network environment to which the second terminal belongs from the network environment to which the first terminal belongs. In this embodiment, the resource mirroring device is located between the two network environments, physically or logically disconnecting the two network environments from direct connection, thereby forming isolation. This method enables secure cross-network access and use of audio and video resources.

[0044] Furthermore, the first transmission mode is a unidirectional serial port transmission method. The unidirectional serial port transmission method can be understood as ensuring, at the physical level, that operation commands can only be transmitted unidirectionally through the serial communication interface, that is, they can only be sent from the command transmission device to the first terminal, and will not be transmitted from the first terminal to the command transmission device.

[0045] Furthermore, the second transmission mode is HDMI (High Definition Multimedia Interface) unidirectional fiber optic transmission. HDMI unidirectional fiber optic transmission can be understood as using fiber optic cable as the transmission medium to transmit the target audio and video signals unidirectionally and physically isolated from the first terminal to the video acquisition device, and to transmit the encoded audio and video signals unidirectionally and physically isolated to the resource mirroring device.

[0046] Furthermore, the operation instructions are coordinate data of keyboard and mouse operations that simulate user actions. That is, in this embodiment, the instruction control device can capture the actual keyboard keystrokes and mouse movements during user operations, and send them to the first terminal through the instruction transmission device, thereby simulating keyboard and mouse operations on the first terminal.

[0047] Furthermore, the network environment to which the second terminal belongs is at a higher level than that to which the first terminal belongs. That is, in this embodiment, the second terminal belongs to a higher-level network domain, and the first terminal belongs to a lower-level network domain.

[0048] Furthermore, the system includes multiple sets of video acquisition devices and command transmission devices; the video acquisition devices in each set are communicatively connected to the video display device; and the command transmission devices in each set are communicatively connected to the command control device. In this embodiment, one set of video display devices and command control devices can correspond to multiple sets of video acquisition devices and command transmission devices through a network. The video acquisition devices in each set are communicatively connected to the video display device, and the command transmission devices in each set are communicatively connected to the command control device.

[0049] Furthermore, each set of video acquisition devices and command transmission devices has its own corresponding first terminal. In practical applications, multiple first terminals can be controlled simultaneously, or the desired first terminal can be selected as needed by switching via the control keyboard, thereby realizing the correspondence between the audio and video content of the video display device and the operation commands issued.

[0050] For ease of understanding, see Figure 2 The diagram illustrates the business process of an audio / video transmission system. The system includes video display devices, command control devices, video acquisition devices, command transmission devices, and resource mirroring devices. The video display devices and command control devices are two physically isolated platforms. These two isolated platforms manage and schedule the video acquisition devices, command transmission devices, and resource mirroring devices, providing situational support, communication support, and remote interaction services. They feature secure access to multi-domain, cross-network resources, integrated use, resource sharing, and collaborative operation. The video acquisition devices are used for cross-network unidirectional secure isolated transmission of target audio and video. The command transmission devices are used for cross-network unidirectional secure isolated transmission of operation commands, and securely control multiple signal sources under different networks according to cross-network forwarding service mapping relationships. The resource mirroring devices are used for secondary network distribution of the isolated target audio and video.

[0051] based on Figure 2 The cross-network audio and video resource secure aggregation business process is as follows: The cross-network scheduling of audio and video resources adopts a design scheme that isolates the video network and the command network to ensure unidirectional transmission and secure isolation of resources across networks. The isolated platform uses two physically isolated devices, namely a video display device and a command control device, which are respectively connected to the video port of the video acquisition device and the command port of the command transmission device; (1) The user sends operation commands to the command transmission device through the isolated platform of the command control device to control the low-level network video terminal (corresponding to the first terminal mentioned above); based on the unidirectional link, the coordinates and operation data of the keyboard and mouse control are sent to realize the control of the low-level network video terminal by moving coordinates and operation data under the unidirectional link condition. It can also be understood that the user performs operations on the low-level network video terminal by sending operation commands; the content of the operation commands only supports the absolute movement data of the mouse and the key data of the keyboard, and does not support the conversion of any other protocols, which also avoids the problem of data leakage caused by the physical link being used by other illegal applications.

[0052] (2) The command transmission device sends operation commands to the low-level network video terminal through a one-way serial port transmission method. In existing conventional applications, USB interface data is commonly used for control in order to realize the simulation operation of the device. However, the USB interface must perform bidirectional data interaction when in use, that is, electrical signals must be used in pairs for sending and receiving. The purpose of this solution using a one-way serial port transmission method is that serial port data does not require bidirectional interaction during use, and can fundamentally achieve one-way transmission (for the command transmission device, the serial port is physically defined as receiving signal, sending signal and ground, three signals. The one-way serial port only connects the sending signal and ground, and the receiving signal is not connected to the corresponding cable, thus physically isolating the bidirectional interaction of the signal), thereby realizing one-way transmission in an absolute sense.

[0053] (3) The low-level network video terminal plays the video of the external network business system (corresponding to the above target audio and video) according to the operation instructions, and outputs it to the video acquisition device through HDMI unidirectional optical fiber; (4) After receiving the HDMI signal, the video acquisition device encodes it into a network video signal and sends it to the isolated video display device via a one-way video network. To improve data compatibility, the encoding process can use traditional audio and video encoding methods, and the encoded data is usually encrypted and not transmitted in plaintext to avoid interception and cracking.

[0054] (5) The video display device, as an isolated platform, uses HDMI unidirectional optical fiber to connect the encoded audio and video signals to the resource mirroring device for secondary isolation. The resource mirroring device decodes the encoded audio and video signals to obtain the target audio and video, and streams the target audio and video to the second terminal in the higher-level network. The cross-network isolated secure access and use of audio and video resources is completed in the above manner.

[0055] This solution adopts a "dual-system, three-tier" security architecture design, constructing a multi-network isolated video resource scheduling hub. The dual-system can be understood as the operation command and audio / video systems; the three-tier can be understood as the high-level network video terminal, the low-level network video terminal, and the audio / video transmission system in this solution. The security isolation layer is configured with a video isolation platform, employing a dual-chain isolation and display-control separation mechanism (i.e., physical isolation between the video network and the command network) to achieve secure cross-network transmission of audio / video resources. The acquisition layer consists of video acquisition equipment, command transmission equipment, and resource mirroring equipment. Unidirectional transmission ensures the irreversible flow of audio / video resources and operation commands, forming a closed-loop process of "resource acquisition - security isolation - intelligent scheduling," meeting the requirements of autonomous controllability and multi-domain collaborative command.

[0056] In this solution, the key technologies for secure video connection and aggregation are "one-way transmission" and "physical isolation".

[0057] One-way transmission has two technical aspects: First, operation commands are transmitted from a higher-level network domain to a lower-level network domain. The transmitted content is only the coordinate data of the keyboard and mouse operation and cannot be other data, thus ensuring data security. At the same time, it ensures that no data is transmitted from the lower-level network to the higher-level network. Second, in actual use, there is a need for long-distance control. Therefore, Ethernet is still used for transmission within the network domain, while physical one-way links are used for cross-domain transmission. Ideally, one-way serial port technology should be used to achieve absolute physical one-way transmission for operation commands.

[0058] In this solution, physical isolation refers to the absolute physical isolation between operation commands and audio / video transmission. Since the two links are in different directions, two sets of equipment are used for transmission and control in this technical solution, and there is no physical or logical connection between them.

[0059] This solution is based on two core designs: "one-way data transmission" and "isolation of audio / video and control". It solves the problem of transmitting audio / video resources from a lower-level network to a higher-level network in practical applications between two business systems or business networks that cannot be interconnected. Based on this capability, audio / video resources from different lower-level networks can be aggregated in a higher-level network to achieve resource aggregation and use.

[0060] This solution also achieves absolute physical one-way transmission and absolute isolation between operation commands and audio / video resources; 1. Operation commands are transmitted from a higher-level network to a lower-level network, solving the current problem that the content of cross-network video transmission can only be determined by the lower-level network. With one-way control, the lower-level network only needs to provide a video terminal (such as a computer), and the higher-level network can control the transmitted content itself without human intervention from the lower-level network. 2. Audio and video content is transmitted unidirectionally from a lower-level network to a higher-level network, solving the need for cross-network audio and video connection. The use of HDMI unidirectional fiber optic cable physically ensures that there will be no problem of data transmission from a higher-level network to a lower-level network. 3. In traditional remote control applications, audio and video data and operation commands must be matched on a unified device to achieve accurate control. In this solution, audio and video resources and operation commands are transmitted through two completely physically disconnected devices, thereby avoiding the formation of uplink and downlink paths simultaneously and preventing unauthorized data transmission.

[0061] The present invention provides an audio and video transmission method, which includes the following steps: Step 1: The command control device responds to the user's operation, generates an operation command, and sends the operation command to the command transmission device; Step 2: The instruction transmission device uses the first transmission mode to send the operation instruction unidirectionally to the first terminal, so that the first terminal can determine the target audio and video according to the operation instruction, and uses the second transmission mode to send the target audio and video unidirectionally to the video acquisition device. Step 3: The video acquisition device encodes the target audio and video to obtain encoded audio and video signals, and then sends the encoded audio and video signals to the video display device. Step four: The video display device adopts the second transmission mode, based on the encoded audio and video signals, to unidirectionally transmit the target audio and video to the second terminal; wherein the second terminal and the first terminal belong to different network environments.

[0062] The aforementioned audio and video transmission method can select the corresponding target audio and video based on the operation instructions generated by the user, thus improving the flexibility of audio and video scheduling. In addition, in this method, the video display device and the command control device are physically isolated from each other. The operation instructions are transmitted through the command control device and the command transmission device, and the target audio and video are transmitted through the video acquisition device and the video display device. The transmission directions of the two links are different, and both the operation instructions and the target audio and video can only be transmitted unidirectionally, thereby avoiding the simultaneous formation of uplink and downlink paths and ensuring the security of the system.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An audio and video transmission system, characterized in that, The system includes: video acquisition equipment, command transmission equipment, and video display equipment and command control equipment that are physically isolated from each other; The instruction control device is used to respond to user operations, generate operation instructions, and send the operation instructions to the instruction transmission device; The instruction transmission device is used to send the operation instruction unidirectionally to the first terminal in a first transmission mode, so that the first terminal determines the target audio and video according to the operation instruction, and to send the target audio and video unidirectionally to the video acquisition device in a second transmission mode. The video acquisition device is used to encode the target audio and video to obtain encoded audio and video signals, and then send the encoded audio and video signals to the video display device. The video display device is used to transmit the target audio and video to the second terminal unidirectionally based on the encoded audio and video signal using the second transmission mode; wherein the second terminal and the first terminal belong to different network environments.

2. The system according to claim 1, characterized in that, The system also includes: a resource mirroring device; The video display device is used to send the encoded audio and video signals to the resource mirroring device using the second transmission mode; The resource mirroring device is used to decode the encoded audio and video signals to obtain the decoded target audio and video, and then transmit the target audio and video to the second terminal.

3. The system according to claim 2, characterized in that, The resource mirroring device is used to isolate the network environment to which the second terminal belongs from the network environment to which the first terminal belongs.

4. The system according to claim 1, characterized in that, The first transmission mode is a one-way serial port transmission method.

5. The system according to claim 1, characterized in that, The second transmission mode is HDMI unidirectional fiber optic transmission.

6. The system according to claim 1, characterized in that, The operation instructions are coordinate data simulating the user's keyboard and mouse operations.

7. The system according to claim 1, characterized in that, The network environment to which the second terminal belongs is at a higher level than the network environment to which the first terminal belongs.

8. The system according to claim 1, characterized in that, The system includes multiple sets of video acquisition devices and command transmission devices; the video acquisition devices in each set are communicatively connected to the video display device; and the command transmission devices in each set are communicatively connected to the command control device.

9. The system according to claim 1, characterized in that, Each group of video acquisition devices and command transmission devices has its own corresponding first terminal.

10. An audio / video transmission method, characterized in that, The method includes: The command control device responds to the user's operation by generating an operation command and sending the operation command to the command transmission device; The instruction transmission device adopts a first transmission mode to send the operation instruction unidirectionally to the first terminal so that the first terminal determines the target audio and video according to the operation instruction, and adopts a second transmission mode to send the target audio and video unidirectionally to the video acquisition device. The video acquisition device encodes the target audio and video to obtain an encoded audio and video signal, and then sends the encoded audio and video signal to the video display device. The video display device adopts the second transmission mode and transmits the target audio and video to the second terminal unidirectionally based on the encoded audio and video signal; wherein the second terminal and the first terminal belong to different network environments.

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