WO2012163059A1

WO2012163059A1 - Method, device and system for device redirection data transmission

Info

Publication number: WO2012163059A1
Application number: PCT/CN2011/082557
Authority: WO
Inventors: 刘健; 陈普
Original assignee: 华为技术有限公司
Priority date: 2011-11-21
Filing date: 2011-11-21
Publication date: 2012-12-06
Also published as: CN103503381A; CN103503381B

Abstract

Disclosed and relating to the field of remote control technologies are a method, device and system for data transmission in device redirection which reduces network bandwidth used therefor, and conserves network resources. The present invention comprises: when access by an external device is detected, the client obtains the device type thereof; on the basis of the device type, the client obtains the compression and decompression algorithms corresponding thereto, and sends the identification information of said algorithms, and the device type, to the server; using the compression algorithm, the client compresses the first piece of data information obtained from the external device, thus generating the first piece of compressed data information, then sends same to the server. The present invention is primarily used during data transmission processes in device redirection.

Description

The present invention relates to the field of remote control, and in particular, to a method, device and system for data transmission of device redirection.

Background technique

Remote desktop technology is a popular technology in the current corporate office environment. With this technical support, users can log in to the remote server computer through the IP network using a specific remote login system on the client computer, and use the remote server computer normally. When a user inserts a device on a client computer, the user needs to use the device redirection on the remote server computer. A common scenario is USB (Universal Serial Bus, Universa l Ser ia l Bus) device redirection. The implementation of the USB device redirection is as follows: The USB device module is separately set on the client computer and the remote server computer, and the data written to the USB device or the data read from the USB device are transmitted to each other through the USB device module.

In the process of implementing the above-mentioned redirection of the USB device, the inventor has found that at least the following problems exist in the prior art: At present, with the high-definition of devices such as USB video and voice, the network bandwidth required for transmitting USB device data is also increasing. High, when users operate multiple USB devices, they need to transfer a large amount of data, which occupies a very high network bandwidth.

Summary of the invention

Embodiments of the present invention provide a method, an apparatus, and a system for data transmission of device redirection, which reduce network bandwidth occupied by device redirection and save network resources.

In order to achieve the above object, embodiments of the present invention use the following technical solutions:

A method for data transmission of device redirection includes:

When detecting the access of the external device, the client acquires the device type of the external device; the client acquires a compression and decompression algorithm corresponding to the external device according to the device type, and the compression and decompression algorithm is The identification information and the device type are sent to the server; the client compresses the first data information acquired from the external device according to a compression algorithm, Generating the first compressed data information, and sending the first compressed data information to the server, so that the server obtains the identifier according to the received identification information of the compression and decompression algorithm and the device type. a decompression algorithm corresponding to the information, and decompressing the first compressed data information according to the decompression algorithm.

A client device, including:

An obtaining module, configured to acquire a device type of the external device when detecting that an external device is accessed;

Obtaining a sending module, configured to acquire a compression and decompression algorithm corresponding to the external device according to the device type, and send the identification information of the compression and decompression algorithm and the device type to a server;

a compression module, configured to compress, according to a compression algorithm, first data information acquired from the external device, generate first compressed data information, and send the first compressed data information to the server, so that the service is The terminal obtains the decompression algorithm corresponding to the identifier information according to the identifier information of the compression and decompression algorithm and the device type, and decompresses the first compressed data information according to the decompression algorithm.

A system for device redirection data transmission, comprising:

The client is configured to acquire a device type of the external device when detecting the access of the external device, acquire a compression and decompression algorithm corresponding to the external device according to the device type, and obtain the compression and solution The identification information of the compression algorithm and the device type are sent to the server; the first data information acquired from the external device is compressed according to a compression algorithm, the first compressed data information is generated, and the first compressed data information is sent. To the server;

The server is configured to obtain, according to the received identification information of the compression and decompression algorithm, the decompression algorithm corresponding to the identifier information, and the first compressed data according to the decompression algorithm. The information is decompressed to obtain the first data information.

The method, device and system for data transmission of device redirection provided by the embodiment of the present invention, when the data is transmitted between the client and the server, the client identifies the type of the accessed external device, thereby determining the appropriate compression according to the device type. And decompression algorithm, compressing data information at one end, The compressed data is transmitted to the other end, and then the compressed data is received at the other end, and the compressed data is decompressed, and the data information is generated for use, which reduces data traffic between the server and the client, reduces transmission bandwidth, and saves Network resources.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set forth in the description of the claims Other drawings may also be obtained from these drawings without the use of creative labor.

1 is a flowchart of a method for data redirection of device redirection according to Embodiment 1 of the present invention; FIG. 2 is a block diagram of a system for redirection of a device according to Embodiment 1 of the present invention; FIG. 4 is a flowchart of a method for data transmission of device redirection according to Embodiment 2 of the present invention; FIG. 4 is a flowchart of a method for data transmission of device redirection according to Embodiment 2 of the present invention; a block diagram of a client device;

6 is a block diagram showing the composition of another client device in Embodiment 3 of the present invention;

FIG. 7 is a structural block diagram of a system for data transmission of device redirection in 3 according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Example 1

A method for data transmission of device redirection is provided in the embodiment of the present invention. As shown in FIG. 1 , the method is a method on the client side, specifically:

101. When detecting that an external device is accessed, the client acquires a device type of the external device. The external device may include a USB storage device connected to the client through a USB interface,

The USB camera is connected to other external devices of the client through an interface such as a FireWire interface or a thunderbolt interface, and the like. The device type may be an audio/video device, a memory, or the like, which is not limited in this embodiment of the present invention.

The device type of the external device is obtained by the following manners, and the device information of the external device is obtained when the external device is detected to be accessed. The device information includes a device type code of the external device; determining a type of the external device according to the device type code.

The device information may include, but is not limited to, a device type code, a device name, and the like.

The client obtains a compression algorithm and a decompression algorithm corresponding to the external device according to the device type, and sends the identification information of the compression and decompression algorithm and the device type to the server.

The pre-set compression algorithm and decompression algorithm may include, but are not limited to, H. 264, MPEG (Moving Pictures Exper ts Group/Mot in Pictures Exper ts Group), Ogg Theora, etc. lossy compression. Algorithms or lossless compression algorithms such as Shanno-Fano coding, Huffman coding, arithmetic coding, run-length coding, LZW coding, etc., users can add other compression algorithms as needed.

The identifier information may be the name of the compression and decompression algorithm or the sequence number set by the client for the compression and decompression algorithm, which is not limited by the embodiment of the present invention.

It should be noted that the functional entity implementing the step 102 may be an independent device, or may be implemented on other hardware devices. The embodiment of the present invention is not limited, and the user may set it according to requirements.

The client compresses the first data information acquired from the external device according to the compression algorithm, generates first compressed data information, and sends the first compressed data information to the server, so that the The server obtains the decompression algorithm corresponding to the identifier information according to the identifier information of the compression and decompression algorithm and the device type, and decompresses the first compressed data information according to the decompression algorithm.

It should be noted that the functional entity that implements the compression of the first data information to generate the first compressed data information may be an independent device or integrated on other hardware, and the present invention does not. Restrictions can be set by the user as needed.

The above steps can be implemented in the system architecture as shown in FIG. 2. The system architecture includes a server, a client, and an external device. The server includes a camera application software, a server USB device module (a server USB device sub-module includes a USB device driver and a virtual host controller driver), and a data compression module. The data decompression module and the remote desktop protocol stack; the client includes a client USB device module (the client USB device module includes a virtual USB device driver, a host controller driver, a USB core driver, a device type identification module, a compression algorithm, and a decompression algorithm). Select module), data compression module, data decompression module, remote desktop protocol stack. If the external device is a USB camera, the embodiment of the present invention describes the above steps by taking the data of the USB camera from the client through the client. As shown in FIG. 3, the specific steps are as follows:

Step 301: The main controller driver detects that there is a USB device access.

Step 302: The main controller driver sends the obtained USB device information to the USB core driver. Step 303: The USB core driver acquires the corresponding USB device according to the USB device information.

The USB device type code, and the USB device type code is sent to the device type identification module.

Step 304: The device type identification module determines, by using the USB device type code, that the accessed device type is a USB camera.

It should be noted that the device type of all external devices that access the client through the USB interface, the FireWire interface, and the lightning interface has a corresponding device type code, and the device type identification module can directly directly according to the device type code. The specific implementation process is obtained by a person skilled in the art, and is not described in detail in the embodiments of the present invention.

Step 305: The device type identification module sends the device type to the compression algorithm and the decompression algorithm selection module.

Step 306: The compression and decompression algorithm selection module acquires the most suitable compression and decompression algorithm when receiving the device type, and sends the device type and the identification information of the compression and decompression algorithm to the server.

Wherein, the compression and decompression algorithm selection module selects the most suitable pressure when receiving the device type The shrink and decompression algorithm can be implemented in the following manner. For example, when the device type is a USB camera, the H.264 lossy compression algorithm is selected to minimize the USB camera video information without affecting the display of the USB camera video information. Bandwidth is transmitted. Other device types are also provided with a compression and decompression algorithm. The specific setting mode can be set according to actual needs, which is not limited by the embodiment of the present invention.

The sending the identifier information of the device type and the compression and decompression algorithm to the server may be implemented by using a remote desktop protocol, and specifically: the client encapsulates the identification information of the compression and decompression algorithm by using a remote desktop protocol. The device type sends the encapsulated information to the server through a remote desktop protocol.

Step 307: After receiving the device type sent by the client and the identification information of the compression and decompression algorithm, the server detects that the client has a USB camera access according to the device type sent by the client, and sends the message according to the client. The identification information of the compression and decompression algorithm finds the corresponding compression and decompression algorithm.

Step 308: Use the camera application software on the server to send a command to read video data to the USB device driver.

Step 309: The USB device driver sends a read command to the virtual host controller driver.

Step 31 0: The virtual host controller driver sends the read command to the remote desktop protocol stack on the server.

Step 31 1: The Remote Desktop Stack sends a read command to the client's Remote Desktop Stack. Step 31 2: The client's Remote Desktop Stack sends a read command to the virtual USB device driver. Step 31 3: The virtual USB device driver sends a read command to the host controller driver.

Step 314: The main controller driver sends a read command to the USB camera.

Step 315: After receiving the read command, the USB camera generates video data and returns the data to the main controller driver.

Step 316: The main controller driver returns the data to the virtual USB device driver.

Step 317: The virtual USB device driver sends data to the data compression module of the client. Step 318: The client data compression module compresses the data using a determined compression algorithm corresponding to the video transmission of the USB camera.

Step 319: The client data compression module returns the compressed data to the virtual USB device driver. Step 320: The virtual USB device driver returns the compressed data to the client's remote desktop protocol stack.

Step 321: The client's remote desktop protocol stack returns the compressed data to the server's remote desktop protocol stack.

The remote desktop protocol stack of the client returns the compressed data to the remote desktop protocol stack of the server. The method includes: the remote desktop protocol stack of the client encapsulates the compressed data according to the remote desktop protocol. And sending the encapsulated compressed data to the remote desktop protocol stack of the server; the remote desktop protocol stack of the server decapsulates the encapsulated compressed data.

Step 322: The server's remote desktop protocol stack returns the compressed data to the virtual host controller driver.

Step 323: The virtual host controller driver sends the compressed data to the data decompression module of the server.

Step 324: The server-side data decompression module decompresses the data by using a decompression algorithm corresponding to the video information transmission of the USB camera, and the decompression algorithm corresponding to the video information transmission of the USB camera is a server-side The corresponding decompression algorithm found by the identification information of the compression and decompression algorithm sent by the client.

Step 325: The server data decompression module returns the decompressed data to the virtual host controller driver.

Step 326: The virtual host controller driver returns the decompressed data to the USB device driver.

Step 327: The USB device driver returns the decompressed data to the camera application software, at which time the user can view the video generated by the USB camera. The device redirection method provided by the embodiment of the present invention, by transmitting the number between the client and the server According to the time, the client identifies the type of the external device to be accessed, thereby determining an appropriate compression and decompression algorithm according to the device type, compressing the data information at one end, generating compressed data for transmission to the other end, and then receiving the compressed data at the other end. Decompressing the compressed data, generating the data information for use, reducing data traffic between the server and the client, reducing transmission bandwidth, and saving network resources.

Example 2

The embodiment of the present invention provides a method for data transmission of device redirection, which is applied to the system architecture shown in FIG. 2, and if the external device is a USB memory, the embodiment of the present invention uses the server to pass the client to the USB storage device. The data is written as an example. As shown in FIG. 4, the steps are as follows: Step 401: The USB host device is detected by the client host controller.

Step 402: The main controller driver sends the obtained USB device information to the USB core driver. Step 403: The USB core driver acquires a USB device type code corresponding to the USB device according to the USB device information, and sends the USB device type code to the device type identification module.

Step 404: The device type identification module determines, by using the USB device type code, that the accessed device type is a USB memory.

The implementation of the device type identification module to determine the type of the device to be accessed by using the USB device type code is the same as the description in the step 304, which is not described in detail in the embodiment of the present invention.

Step 405: The device type identification module sends the device type to the compression algorithm and the decompression algorithm selection module.

Step 406: The compression and decompression algorithm selection module acquires the most suitable compression algorithm and decompression algorithm when receiving the device type, and sends the device type and the identification information of the compression and decompression algorithm to the server.

The implementation of the compression and decompression algorithm selection module to select the most suitable compression and decompression algorithm when receiving the device type is the same as the description in the step 306, and details are not described herein.

Step 407: Receive the device type sent by the client and the identification information of the compression and decompression algorithm. Then, the server detects that the client has USB memory access according to the device type sent by the client, and searches for a corresponding compression and decompression algorithm according to the identification information of the compression and decompression algorithm sent by the client.

Step 408: The server writes data to the USB memory through the application, and first sends the data to the USB device driver.

Step 409: The USB device driver sends the data to the virtual host controller driver.

Step 41 0: The virtual host controller driver sends the data to the data compression module.

Step 41: The server data compression module compresses the data by using a compression algorithm corresponding to the USB memory data, where the compression algorithm corresponding to the USB memory data is a compression and solution sent by the server according to the client. The corresponding compression algorithm found by the identification information of the compression algorithm.

Step 412: After the server data compression module compresses the data, the compressed data is sent back to the virtual host controller driver.

Step 41 3: The virtual host controller driver sends the compressed data to the remote desktop protocol stack. Step 414: The server-side remote desktop protocol stack sends the compressed data to the client's remote desktop protocol stack.

Step 415: The client's Remote Desktop Stack sends the compressed data to the virtual USB device driver.

Step 416: The virtual USB device driver sends the compressed data to the data decompression module of the client.

Step 417: The client data decompression module decompresses the data using the determined decompression algorithm corresponding to the USB memory data.

Step 418: The client data decompression module sends the decompressed data back to the virtual USB device driver.

Step 419: The virtual USB device driver sends the decompressed data to the main controller driver. Step 420: The main controller driver writes the decompressed data into the USB memory. The device redirection data transmission method provided by the embodiment of the present invention, when the client and the server transmit data, identify the type of the accessed external device on the client, and determine an appropriate compression and decompression algorithm according to the device type, The data information is compressed at one end, the compressed data is transmitted to the other end, and then the compressed data is received at the other end, and the compressed data is decompressed to generate the data information for use, thereby reducing data traffic between the server and the client. , reducing transmission bandwidth and saving network resources.

Example 3

The embodiment of the present invention provides a client device. As shown in FIG. 5, the client device includes: an obtaining module 41, an obtaining sending module 42, and a compressing module 43.

The obtaining module 41 is configured to acquire a device type of the external device when detecting that an external device is accessed.

The acquiring module is specifically configured to: when detecting that an external device is accessed, acquiring device information of the external device, where the device information includes a device type code of the external device; determining, according to the device type code The type of external device.

The obtaining and sending module 42 is configured to acquire a compression and decompression algorithm corresponding to the external device according to the device type, and send the identification information of the compression and decompression algorithm and the device type to the server.

The compression module 43 is configured to compress the first data information acquired from the external device according to a compression algorithm, generate first compressed data information, and send the first compressed data information to the server, so that the The server obtains the decompression algorithm corresponding to the identifier information according to the identifier information of the compression and decompression algorithm and the device type, and decompresses the first compressed data information according to the decompression algorithm.

The compression module further includes a remote desktop protocol stack, and the remote desktop protocol stack is configured to encapsulate the identification information of the compression and decompression algorithm and the device type by using a remote desktop protocol, and pass the encapsulated information to a remote desktop protocol. Sent to the server.

Further, as shown in FIG. 6, the apparatus further includes: a decompression module 44.

The decompression module 44 is configured to: when the external device type is a USB storage device, according to compression The algorithm compresses the second compressed data information generated by the second data information that needs to be written into the external device, acquires the second data information, and writes the second data information to the USB storage device.

The embodiment of the invention provides a system for data transmission of device redirection. As shown in FIG. 7, the system includes: a client 51 and a server 52.

a client 51, configured to acquire a device type of the external device when detecting an external device access, acquire a compression and decompression algorithm corresponding to the external device according to the device type, and compress and decompress the compressed device The identification information of the algorithm and the device type are sent to the server 52; compressing the first data information acquired from the external device according to a compression algorithm, generating first compressed data information, and transmitting the first compressed data information To the server 52.

The server 52 is configured to acquire, according to the received identification information of the compression and decompression algorithm, the decompression algorithm corresponding to the identifier information, and the first compressed data information according to the decompression algorithm. Decompress to obtain the first data information.

The apparatus and system for data transmission of device redirection provided by the embodiment of the present invention, when transmitting data by the client and the server, identify the type of the external device accessed by the client, thereby determining appropriate compression and decompression according to the device type. The algorithm compresses the data information at one end, generates compressed data to be transmitted to the other end, and then receives the compressed data at the other end, and decompresses the compressed data to generate the data information for use, thereby reducing the relationship between the server and the client. Data traffic reduces transmission bandwidth and saves network resources.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation. . Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer. A hard disk or optical disk or the like includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can easily within the technical scope disclosed by the present invention. Any changes or substitutions are contemplated as being within the scope of the invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Claim

A data transmission method for device redirection, comprising:

When detecting the access of the external device, the client acquires the device type of the external device; the client acquires a compression and decompression algorithm corresponding to the external device according to the device type, and the compression and decompression algorithm is The identification information and the device type are sent to the server;

The client compresses the first data information acquired from the external device according to a compression algorithm, generates first compressed data information, and sends the first compressed data information to the server, so that the server receives the data according to the receiving end. The identification information of the compression and decompression algorithm and the device type obtain the decompression algorithm corresponding to the identification information, and decompress the first compressed data information according to the decompression algorithm.

The method for data transmission of the device redirection according to claim 1, wherein when the external device is detected to be accessed, the device type of the external device is:

Obtaining device information of the external device when the external device is detected to be accessed, where the device information includes a device type code of the external device;

The type of the external device is determined according to the device type code.

The method for data transmission of the device redirection according to claim 1, wherein the sending the identification information of the compression and decompression algorithm and the device type to the server comprises: the client passing the remote desktop The protocol encapsulates the identification information of the compression and decompression algorithm and the device type, and sends the encapsulated information to the server through a remote desktop protocol.

The method for data transmission of the device redirection according to claim 1, wherein the transmitting the first compressed data information to the server comprises:

If the external device is a universal serial bus USB device, the data compression module of the client sends the first compressed data information to the virtual USB device driver of the client;

The virtual USB device driver sends the first compressed data information to a remote desktop protocol stack of the client;

The remote desktop protocol stack of the client encapsulates the first compressed data information according to the remote desktop protocol, and sends the encapsulated first compressed data information to the remote desktop protocol stack of the server; The remote desktop protocol stack of the server decapsulates the encapsulated first compressed data information, and sends the first compressed data information to the data decompression module through a virtual host controller driver of the server.

The method for data transmission of the device redirection according to claim 1, wherein after the identification information of the compression and decompression algorithm and the device type are sent to the server, the method further includes:

The server receives the device type of the external device and the identification information of the compression and decompression algorithm, and obtains a corresponding compression algorithm according to the identification information of the compression and decompression algorithm;

When the external device type is a USB storage device, the server compresses the second data information that needs to be written into the external device according to a compression algorithm, generates second compressed data information, and sends the second compressed data information. Giving the client, so that the client decompresses the received second compressed data information according to the decompression algorithm, obtains the second data information, and writes the information to the USB storage device.

6. A client device, comprising:

An obtaining module, configured to acquire a device type of the external device when an external device is detected to be accessed;

Obtaining a sending module, configured to acquire a compression and decompression algorithm corresponding to the external device according to the device type, and send the identification information of the compression and decompression algorithm and the device type to the server;

7. Apparatus for device redirection according to claim 6 wherein:

The acquiring module is specifically configured to: when detecting that an external device is accessed, acquiring device information of the external device, where the device information includes a device type code of the external device; The code determines the type of the external device.

The apparatus for redirection of the device according to claim 6, wherein the compression module further comprises:

The remote desktop protocol stack is configured to encapsulate the identification information of the compression and decompression algorithm and the device type by using a remote desktop protocol, and send the encapsulated information to the server through a remote desktop protocol.

The apparatus for redirection of the device according to claim 6, further comprising: a decompression module, configured to: when the external device type is a USB storage device, write to the external The second data information of the device compresses the generated second compressed data information, acquires the second data information, and writes the information to the USB storage device.

A system for data transmission of device redirection, characterized in that it comprises a client and a server,