CN116366928B - USB camera bridging method and cloud terminal - Google Patents
USB camera bridging method and cloud terminal Download PDFInfo
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- CN116366928B CN116366928B CN202310639076.8A CN202310639076A CN116366928B CN 116366928 B CN116366928 B CN 116366928B CN 202310639076 A CN202310639076 A CN 202310639076A CN 116366928 B CN116366928 B CN 116366928B
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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
- H04N21/64784—Data processing by the network
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/08—Protocols specially adapted for terminal emulation, e.g. Telnet
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/218—Source of audio or video content, e.g. local disk arrays
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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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
- H04N21/4223—Cameras
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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
- H04N21/643—Communication protocols
- H04N21/64322—IP
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention discloses a USB camera bridging method, which is applied to a cloud service system, wherein virtual camera driving is realized through an OTG port of a cloud terminal, video data acquired by a physical camera connected with the cloud terminal is provided for the virtual camera driving, the OTG port is used as a virtual camera to be connected with the cloud terminal through the USB port, the cloud terminal maps the virtual camera to a cloud server, the OTG port transmits the video data through a bulk transmission mode, the cloud terminal can acquire the video data by utilizing a handshake mechanism of the bulk transmission mode, and if the cloud server cannot effectively receive the video data due to a network, the cloud terminal can resend the video data to reduce frame loss and blocking.
Description
Technical Field
The invention relates to the field of video data transmission of USB equipment on a cloud terminal, in particular to a USB camera bridging method and a corresponding cloud terminal.
Background
The virtual cloud desktop has various advantages in the aspects of flexibility, reliability, safety, centralized management, comprehensive cost and the like, and has wide application in various fields of enterprises, education, medical treatment and the like. Accessing a USB camera in a virtual cloud desktop application scenario is also a common requirement, for example, acquiring a certificate picture through the USB camera. The cloud desktop is a virtual desktop environment running on the cloud server, and cloud terminal users remotely access and use resources such as application programs and files in the cloud desktop through network connection, so that the cloud terminal users want to access local USB cameras through the cloud desktop, and the USB cameras connected with the cloud terminal need to be mapped into a cloud desktop session.
In general, in order to ensure low delay of video frames, a camera manufacturer uses an Isochronous transmission mode (Isochronous mode) of a USB interface protocol to realize data transmission from a camera to a cloud terminal, where the role of the camera is USB device (USB device), and the role of the cloud terminal is USB host (USB host).
Isochronous transmissions generally require a bus with sufficient bandwidth and sacrifice the latter between real-time and low bit error rate in data transmission, which is suitable for certain applications where time requirements are high and data volumes are large, where such transmission type devices are used with microphones, modems, audio devices, etc., where even small amounts of data are erroneous, no significant impact is exerted on the application software (e.g. audio software).
In the isochronous transmission mode, based on the fact that the bus error rate is low, the transmission is generally considered to be successful, and no handshake signal is set in the USB interface protocol to indicate suspension, so that the USB device and the USB host never stop halfway in the data transmission process, and even if the error can be detected, the real-time pipeline does not stop, and the USB host still continues to process the data of the next frame. Thus, the error detection functionality is relatively weak because the real-time transport protocol does not support handshaking every transaction.
However, when the cloud terminal accesses the USB camera connected to the cloud terminal through the USB device mapping, the frame loss and the clip of the frame are easily caused by the isochronous transmission mode due to the network bandwidth bottleneck and the network packet loss.
Disclosure of Invention
In view of the above, the invention provides a method for bridging a USB physical camera, which aims at solving the problem that a frame loss and a stuck picture are likely to occur in a USB physical camera image connected with a cloud terminal accessed on a cloud desktop in an existing cloud service system.
In order to solve the above problems, the present invention provides a method for bridging a USB camera, which is applied to a cloud service system, the cloud service system includes a cloud server and a cloud terminal, the cloud terminal includes an OTG port, a first USB interface and a second USB port, the first USB port is connected to a physical camera, and the OTG port is connected to the second USB port, the method includes the following steps:
(1) The cloud terminal receives video data collected by the physical camera;
(2) Virtual camera driving is realized at the OTG port to form a virtual camera;
(3) The cloud terminal writes video data acquired by the physical camera into the virtual camera, and based on a USB protocol, the virtual camera sends the video data to the second USB port through the OTG port; a Bulk transmission mode is adopted between the OTG port and the second USB port;
(4) Based on a USB/IP protocol, the cloud terminal maps the second USB port to the cloud server and sends video data received by the second USB port to the cloud server.
Further, the video data collected by the physical camera is sent to the virtual camera after passing through the cloud terminal, so that the cloud terminal can modify the transmission frame rate and resolution of the video data according to the real-time network state of the cloud service system and then send the video data to the virtual camera to be transmitted back to the second USB port of the cloud terminal, and the influence of network bandwidth bottleneck on data transmission between the cloud terminal and the cloud server can be effectively reduced.
Wherein, when the USB host driver is implemented at the second USB port, the virtual camera sends video data to the second USB port through the OTG port, including the following steps:
the USB host driver sends an ACK handshake signal to the virtual camera driver according to a preset judgment criterion;
and after receiving the ACK handshake signal, the virtual camera driver sends next round of video data to the USB host driver.
The preset judgment criterion is that the cloud terminal receives a data receiving confirmation instruction sent by the cloud server.
And if the USB device driver does not receive the ACK handshake signal sent by the USB host driver, retransmitting the video data of the round.
Correspondingly, the invention also discloses a cloud terminal, which comprises an OTG port, a first USB port, a second USB port, a storage module and a control module; the OTG port is connected with the second USB port, and the first USB port is used for being connected with a physical camera; the storage module stores a control program, the control module executes the control program, sends video data acquired from the first USB port to the OTG port, and then controls the OTG port to transmit the video data to the second USB port through a Bluetooth mode based on a USB protocol.
Based on a USB protocol, the control module controls the OTG port to operate a virtual camera driver, controls the second USB port to operate a USB host driver, and supports a standard UVC interface.
Further, the cloud terminal further comprises a network module, wherein the network module is used for connecting with a cloud server; the control module controls the network module to communicate with the cloud server based on a USB/IP protocol, and sends video data received by the second USB port to the cloud server.
Further, if the cloud server correctly receives the video data sent by the cloud terminal, a data receiving confirmation instruction is sent to a control module of the cloud terminal.
Further, after receiving the data receiving confirmation instruction, the control module controls the OTG port to send next round of video data to the second USB port; otherwise, the OTG port is controlled to resend the video data of the round to the second USB port.
Compared with the prior art, the invention has the following advantages:
according to the USB camera bridging method and the corresponding cloud terminal, virtual camera driving is achieved through the OTG port of the cloud terminal, video data collected by the physical camera connected with the cloud terminal are provided for the virtual camera driving, the OTG port is used as a virtual camera to transmit image data back to the cloud terminal through a Bulk transmission mode, the cloud terminal maps the virtual camera to a cloud server, and bridging of the physical camera is achieved; by setting the virtual camera and utilizing a handshake mechanism of Bulk transmission mode, the cloud terminal can ensure that the cloud terminal acquires video data, if the cloud server cannot effectively receive the video data due to network, the cloud terminal can retransmit the video data, and under the condition that the conventional common physical camera is not required to be modified to transmit the video data in an Isochronous mode, the cloud terminal can effectively transmit the video data to the cloud server under the condition that network states such as network bandwidth bottleneck and network packet loss are poor, and the phenomenon of picture frame loss and blocking is reduced.
Drawings
Fig. 1 is a schematic flow diagram of a cloud terminal bridging a local physical camera to a cloud server in a cloud service system of the present invention;
FIG. 2 is a schematic diagram of a cloud service system according to the present invention;
FIG. 3 is a diagram of a communication frame between a host and a device in a USB protocol.
Description of the embodiments
The invention will be further illustrated with reference to examples.
In the invention, the physical camera and the virtual camera are relative concepts, and both conform to the specification of the USB protocol, the physical camera comprises hardware with an image acquisition function, and the virtual camera does not comprise hardware with an image acquisition function. In the invention, the first USB port and the second USB port have no difference in function, and the first USB port and the second USB port are only used for distinguishing different individuals in the same category and are not limited by port functions or levels.
Referring to fig. 1 and fig. 2, the cloud service system includes a cloud terminal and a cloud server, the cloud terminal is provided with a first USB port, a second USB port and a USB OTG port, the first USB port is connected with a physical camera, and the OTG port is connected with the second USB port; the cloud terminal further comprises a storage module, a control module and a network module, wherein the storage module is used for storing a control program, the control module executes the control program to control other modules and interfaces to achieve corresponding functions, and the network module is used for carrying out network communication before the cloud terminal and the cloud server. The cloud terminal can access an application program running on the cloud server through the cloud desktop, and the cloud terminal needs to access video data acquired by the local physical camera, and needs to map the local physical camera to the cloud server and then access the video data through the cloud desktop. In the invention, the physical camera is not directly mapped to the cloud server, but is bridged to the cloud server through the USB OTG port.
The physical camera supporting the USB protocol is referred to herein as a USB camera. Specifically, the bridging method of the USB camera comprises the following steps:
(1) The cloud terminal receives video data acquired by a physical camera through a first USB port;
(2) Virtual camera driving is realized at the OTG port to form a virtual camera;
(3) The cloud terminal writes video data acquired by the physical camera into the virtual camera driver, and based on a USB protocol, the virtual camera sends the video data to a second USB port through an OTG port; a Bulk transmission mode is adopted between the OTG port and the second USB port;
(4) Based on the USB/IP protocol, the cloud terminal maps the second USB port to the cloud server and sends video data received by the second USB port to the cloud server.
In specific implementation, according to the protocol standard (UVC, USB Video Class) defined by the USB Video capturing device, UVC driving (UVC driver) is implemented at the first USB port and the second USB port of the cloud terminal, and the cloud terminal is used as (USB host) to obtain Video data sent by the devices connected to the first USB port and the second USB port.
According to the UVC protocol, UVC driver is suitable for use in a camera device that complies with the USB video class specification, including a V4L2 kernel device driver, V4L2 is capable of providing some application programming interface (API, application Programming Interface) associated with video, which is in fact a series of read, write, open, ioctl functions. In the specific implementation, in the step (1), an application program (illustrated in UVC Bridge) may be implemented in the cloud terminal to call these APIs sequentially through a library, a kernel, a driver, and a hardware device to obtain video data. The physical camera is used as a USB device (USB device), and transmits data between the USB device and the first USB port according to a USB protocol, because the physical camera is mostly applied in a streaming data transmission scenario with strict time and strong fault tolerance, or in an instant application requiring a constant data transmission rate, an Isochronous transmission mode (Isochronous mode) is generally adopted, and the transmission mode is fixed when the camera leaves the factory.
According to The USB OTG (USB On-The-Go) protocol, an OTG port can realize a device controller and a host controller, and The invention uses The OTG port to realize The device controller; as shown in fig. 3, according to the USB protocol, the host side mainly includes: class driver) includes standard interface protocols such as mass driver, CDC, HID, UVC, USB device driver (USB device driver) and host controller driver (HDC). Correspondingly, the equipment end mainly comprises: a device Function driver layer (Function driver) corresponding to the class device driver layer of the host end; the Gadget device driver layer (Gadget device driver) communicates with the UDC directly downwards through USB Gadget Interface to establish a link; providing a generic interface up through Compsite Framwork, shielding USB requests and transmission details; and a device controller driver layer (UDC, USB device controller) for directly processing the USB device controller and transmitting data with the host controller driver layer according to a USB protocol. The device function driver layer has an entire Gedget device driver entry legacy and various USB sub-class device function drivers functions, which function to configure interface descriptions of the USB sub-class protocols and other sub-class protocols, such as the UVC interface protocol.
According to the USB protocol, the Bulk transmission mode (Bulk mode) is applied to a large amount of data to be transmitted and received, and there is no bandwidth and interval time requirement. In summary, bulk mode has a handshake mechanism that ensures data transfer.
In specific implementation, the invention combines USB OTG protocol and USB protocol to realize USB device drive at OTG port of cloud terminal, which is called virtual camera drive (figure UVC Gadget driver) according to function, forming a virtual USB device, namely virtual camera, configuring device description information and supported protocol at device function drive layer, wherein the device description information comprises VID and HID as identity of the virtual camera, and the supported protocol comprises UVC; correspondingly, in the second USB port, the cloud terminal is used as a USB host, and the device driving layer is configured as a UVC driver.
An application program (illustrated UVC Bridge) is implemented in a cloud terminal, video data acquired from a physical camera is cached, and then an API driven by a USB Gadget is called to extract data from the cache.
Because the video data collected by the physical camera is sent to the virtual camera after passing through the cloud terminal, as an implementation manner, an application program (illustrated UVC Bridge) of the cloud terminal can also modify the transmission frame rate, resolution and other attributes of the video data according to the real-time network state of the cloud service system and then send the video data to the virtual camera to be returned to the second USB port of the cloud terminal, so that the influence of network bandwidth bottleneck on data transmission between the cloud terminal and the cloud server can be effectively reduced, and the best transmission effect can be achieved under the limited bandwidth.
As shown in fig. 1, according to the USB/IP protocol, USB devices may be shared and transmitted over a network, enabling a remote computer to access USB devices connected on a local computer. The USB/IP scheme includes two components: a USB/IP Server (USB/IP Server) and a USB/IP Client (USB/IP Client); the USB/IP server runs on a local computer and is responsible for converting the USB device into a TCP/IP stream; the USB/IP client runs on a remote computer and is responsible for receiving the TCP/IP stream and restoring it to the original USB data.
According to the USB/IP protocol, the cloud terminal is used as the USB/IP server, the cloud server is used as the USB/IP client, the second USB port is mapped to the cloud server, USB host driving (shown as UVC driver) corresponding to the cloud terminal is realized at the cloud server, and therefore an application program at the cloud server can obtain video data transmitted by the virtual camera, and bridging of the physical camera is realized.
The data transmission process of each port of the cloud terminal and the network module is realized through a control program, the control module executes the control program to control the OTG port to run the virtual camera driver, and the second USB port runs the USB host driver; transmitting the video data acquired from the first USB port to the OTG port, and controlling the OTG port to transmit the video data to the second USB port through the Bluetooth mode based on the USB protocol; and controlling the network module and the cloud server to perform network communication based on the USB/IP protocol, so as to realize the mapping of the second USB port.
As an implementation mode, a data receiving confirmation instruction is set between the cloud terminal and the cloud server, the cloud server judges whether the received data meets the error rate requirement, if so, the data receiving confirmation instruction is sent to a control module of the cloud terminal, and after the control module receives the data receiving confirmation instruction, the OTG port is controlled to send next round of video data to the second USB port; otherwise, the OTG port is controlled to resend the video data of the round to the second USB port. Specifically, the host control driving layer HDC driven by the USB host running at the second USB port and the device controller driving layer UDC driven by the USB device running at the OTG port (i.e., virtual camera driving) are implemented by ACK handshake signals. The USB host driver takes whether the data receiving confirmation instruction is received as a judgment criterion, and if the data receiving confirmation instruction is received, the USB host driver sends an ACK handshake signal to the virtual camera driver; and the virtual camera driver receives the ACK handshake signal sent by the USB host driver and then sends the next round of video data, and if the virtual camera driver does not receive the ACK handshake signal sent by the USB host driver, the video data of the round is resent, so that the reliability of data transmission is ensured.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the equivalent changes belong to the protection scope of the present invention.
Claims (10)
1. The utility model provides a USB camera bridging method, is applied to cloud service system, cloud service system includes cloud ware and cloud terminal, cloud terminal includes OTG port, first USB port and second USB port, first USB port connects physical camera, its characterized in that, OTG port connects the second USB port, and this method includes following steps:
(1) The cloud terminal receives video data collected by the physical camera;
(2) Virtual camera driving is realized at the OTG port to form a virtual camera;
(3) The cloud terminal writes video data acquired by the physical camera into the virtual camera, and based on a USB protocol, the virtual camera sends the video data to the second USB port through the OTG port; the OTG port and the second USB port adopt a Bulk mode to transmit video data;
(4) Based on a USB/IP protocol, the cloud terminal maps the second USB port to the cloud server and sends video data received by the second USB port to the cloud server.
2. The method according to claim 1, wherein the cloud terminal performs attribute modification on the video data collected by the physical camera according to the real-time network state of the cloud service system, and then writes the video data into the virtual camera, wherein the attribute modification includes a transmission frame rate and/or a resolution.
3. The USB camera bridging method according to claim 1, wherein when a USB host driver is implemented at the second USB port, the virtual camera sends video data to the second USB port through the OTG port, comprising the steps of:
the USB host driver sends an ACK handshake signal to the virtual camera driver according to a preset judgment criterion;
and after receiving the ACK handshake signal, the virtual camera driver sends next round of video data to the USB host driver.
4. The method for bridging a USB camera according to claim 3, wherein the preset criterion is that the cloud terminal receives a data reception confirmation instruction sent by the cloud server.
5. A method of bridging a USB camera according to claim 3, wherein the virtual camera driver resends the current round of video data if the virtual camera driver does not receive an ACK handshake signal sent by the USB host driver.
6. The cloud terminal is matched with the cloud server for use and comprises an OTG port, a first USB port, a second USB port, a storage module and a control module; the OTG port is connected with the second USB port; virtual camera driving is realized at the OTG port to form a virtual camera;
the cloud terminal writes video data acquired by the physical camera into the virtual camera when the control module executes the control program, and the virtual camera sends the video data to the second USB port through the OTG port based on a USB protocol; based on a USB/IP protocol, the cloud terminal maps the second USB port to the cloud server and sends video data received by the second USB port to the cloud server.
7. The cloud terminal of claim 6, wherein said control module controls running a virtual camera driver at said OTG port, controls said second USB port to run a USB host driver, and said virtual camera driver and said USB host driver support a standard UVC interface based on a USB protocol.
8. The cloud terminal of claim 6, further comprising a network module for connecting to a cloud server; the control module controls the network module to communicate with the cloud server based on a USB/IP protocol, and sends video data received by the second USB port to the cloud server.
9. The cloud terminal of claim 8, wherein if the cloud server correctly receives the video data sent by the cloud terminal, a data reception confirmation instruction is sent to a control module of the cloud terminal.
10. The cloud terminal of claim 9, wherein the control module controls the OTG port to transmit next round of video data to the second USB port after receiving the data reception confirmation instruction; otherwise, the OTG port is controlled to resend the video data of the round to the second USB port.
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