CN113126869B - Method and system for realizing KVM image high-speed redirection based on domestic BMC chip - Google Patents
Method and system for realizing KVM image high-speed redirection based on domestic BMC chip Download PDFInfo
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
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Abstract
The invention provides a method and a system for realizing high-speed redirection of a KVM image based on a domestic BMC chip, which can reduce the processing work of redundant data coding compression and network transmission and improve the display quality. Due to the locally changing characteristics of screen video data, data between adjacent frames is mostly identical, resulting in a considerable degree of repeated redundant data for encoding compression and network transmission data. The design of the hardware module in the aspect of video is basically consistent with that of a BMC chip popular in the market, and the hardware module is compatible with a universal KVM implementation scheme and has good applicability. The data volume of actual compression transmission is small, a large amount of network bandwidth can be saved, and therefore higher-quality far-end image display can be supported. The strategy of preferentially updating the display area of the mouse can more quickly feed back the change of the display picture to the client, thereby effectively reducing the delay.
Description
Technical Field
The invention relates to the technical field of embedded systems, in particular to a method and a system for realizing high-speed redirection of a KVM image based on a domestic BMC chip.
Background
KVM OVER IP is also called digital KVM, and KVM is an abbreviation of Keyboard, display, and Mouse (Keyboard, Video, Mouse), which is to remotely control a plurality of computers through a local set of Keyboard, display, and Mouse. It collects the video signal from the local computer, converts into digital information through analog-to-digital conversion, compresses into IP packet, transmits through internet or special network, the remote control console receives the IP packet, unpacks, converts, presents on the screen of the control console; the administrator operates the keyboard and mouse of the console accordingly, a series of control commands sent out are combined into an IP packet by the console, and the IP packet is sent back to the local side through the network, and is restored into keyboard and mouse signals after being unpacked, so that the local computer executes corresponding actions, and remote control is realized.
In a server product, different use scenes of a server are different, and in some cases, the server is required to be operated only in a remote mode and not connected with a display locally, so that when the display is not connected locally, the display card on a mainboard of the server still needs to output. Currently, many servers use BMC as a display card, and a BMC chip is used as a server to implement KVM functionality. Compared with a KVM transmission switch, the KVM function implemented by the BMC chip is limited by the fact that the image quality is generally not high in software and hardware design, and the delay is large and needs to be improved.
Patent document CN109086634A discloses a BMC chip management method, system, and a BMC chip and a computer-readable storage medium, where the BMC chip includes: the method comprises the following steps: the protection register is used for controlling the output level of the IO pin of the BMC chip; and the IO pin is connected with a write protection pin of the Flash chip. When the BMC chip receives a write protection command, the write protection function of the Flash chip is enabled by controlling the protection register; judging whether the firmware program of the BMC chip needs to be updated, if so, controlling the protection register so that the Flash chip closes the write protection function; and after the updating is finished, the protection register is controlled again to enable the write protection function of the Flash chip. The patent still leaves room for improvement in process configuration and technical effect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for realizing high-speed redirection of a KVM image based on a domestic BMC chip.
The invention provides a method for realizing high-speed redirection of a KVM image based on a domestic BMC chip, which comprises the following steps:
step S1: constructing a VGA driving software module, exporting video data and acquiring video data export result information;
step S2: according to the video data export result information, a software module for realizing video comparison is constructed, the current frame in a video data cache region is compared with the selected region of the previous frame, whether the current frame is consistent with the selected region is judged, and region consistency judgment result information is obtained;
step S3: according to the region consistency judgment result information, a 2D video engine hardware module is constructed, so that the video data specified by the video data cache management module is subjected to jpeg hardware compression, and hardware compression result information is obtained;
step S4: according to the hardware compression result information, a software module for realizing video data cache management is constructed, video data is cached and managed, and video data cache and management result information are obtained;
step S5: constructing an RFB server software module according to video data cache and management result information, realizing refreshing in a specified area based on jpeg data compressed by a 2D video engine hardware module and area division information provided by the video data cache management software module, and acquiring refresh result information of the specified area;
step S6: constructing and realizing an RFB client software module according to the refresh result information of the designated area, receiving video data and protocol information sent by an RFB server software module based on an RFB Tight protocol, decompressing by a web player and then refreshing and displaying in the designated area, and acquiring the refresh display result information of the web player in the designated area after decompression;
step S7: and refreshing display result information in a designated area after the Web player is decompressed, constructing a Web UI software module serving as a Web page frame for supporting the KVM video Web player, and acquiring the realization result information of the KVM image high-speed redirection based on the domestic BMC chip.
Preferably, step S1 includes:
step S1.1: and customizing a VGA driving software module aiming at a domestic BMC chip, and collecting RGB data of each frame of video to a specified block in a video data cache region.
Step S1.2: the video data cache is opened through the operating system so that other modules can access the video data cache, such as a shared memory.
Preferably, the step S4 includes:
step S4.1: aiming at the characteristic that VGA display output is scanned line by line from the upper left corner, dividing video RGB data into n areas from top to bottom, comparing one whole area at a time, namely, taking the selected area as a range, comparing the stored data in the area of the previous frame image with the data in the area of the current frame, and if the data in the whole area of the current frame image is not consistent, transmitting the data in the whole area of the current frame image to a compression engine for compression; the display data area division diagram is shown in fig. 2; the actual execution method for dividing the n regions is to set the initial addresses and the sizes of R0-Rn, and the cache data transmission is actually the address transmission, so that the consumption of hardware performance and processing time caused by data copying is avoided;
step S4.2: the video comparison module initializes a comparison start position as R0, Rinitial as R0, and sets a current comparison position as R0: the initial comparison sequence is R0- > R1- > R2- >, the sequence is repeated, and each time one round of comparison is finished (Rcompare-ringing-n-1), the current frame buffer and the previous frame buffer are updated;
step S4.3: the design realizes a cache exchange management module, and the work of cache allocation, cache address transmission, comparison area setting and the like is managed in a unified way.
Preferably, the step S4 includes:
step S4.4: the comparison sequence of R0-Rn is automatically adjusted according to the position of the current mouse, the RFB server is responsible for receiving the position data of the mouse in real time, calculating the area where the current mouse is located, setting the area as Ra, storing the last area as Ra-1, and judging whether Ra is changed relative to Ra-1;
step S4.5: when the mouse position changes to cause the change of the area (R0-Rn) where the mouse is located and the changed area is assumed to be Ra, the RFB server informs the cache exchange management module, and the cache exchange management module executes the setting: where r denotes Ra, the next comparison region is Ra.
Preferably, step S5 includes:
step S5.1: and constructing an RFB server software module according to video data cache and management result information, finishing video data transmission and screen refresh control by adopting an RFB light protocol based on jpeg data compressed by a 2D video engine hardware module and region division information provided by the video data cache management software module, realizing refresh in a specified region and acquiring refresh result information of the specified region.
The system for realizing the high-speed redirection of the KVM image based on the domestic BMC chip comprises the following steps:
module M1: constructing a VGA driving software module, exporting video data and acquiring video data export result information;
module M2: according to the video data export result information, a software module for realizing video comparison is constructed, the current frame in a video data cache region is compared with the selected region of the previous frame, whether the current frame is consistent with the selected region is judged, and region consistency judgment result information is obtained;
module M3: according to the region consistency judgment result information, a 2D video engine hardware module is constructed, so that the video data specified by the video data cache management module is subjected to jpeg hardware compression, and hardware compression result information is obtained;
module M4: according to the hardware compression result information, a software module for realizing video data cache management is constructed, video data is cached and managed, and video data cache and management result information are obtained;
module M5: constructing an RFB server software module according to video data cache and management result information, realizing refreshing in a specified area based on jpeg data compressed by a 2D video engine hardware module and area division information provided by the video data cache management software module, and acquiring refresh result information of the specified area;
module M6: constructing and realizing an RFB client software module according to the refresh result information of the designated area, receiving video data and protocol information sent by an RFB server software module based on an RFB Tight protocol, decompressing by a web player and then refreshing and displaying in the designated area, and acquiring the refresh display result information of the web player in the designated area after decompression;
module M7: and refreshing display result information in a designated area after the Web player is decompressed, constructing a Web UI software module serving as a Web page frame for supporting the KVM video Web player, and acquiring the realization result information of the KVM image high-speed redirection based on the domestic BMC chip.
Preferably, the module M1 includes:
module M1.1: and customizing a VGA driving software module aiming at a domestic BMC chip, and collecting RGB data of each frame of video to a specified block in a video data cache region.
Module M1.2: the video data cache is opened through the operating system so that other modules can access the video data cache, such as a shared memory.
Preferably, said module M4 comprises:
module M4.1: aiming at the characteristic that VGA display output is scanned line by line from the upper left corner, dividing video RGB data into n areas from top to bottom, comparing one whole area at a time, namely, taking the selected area as a range, comparing the stored data in the area of the previous frame image with the data in the area of the current frame, and if the data in the whole area of the current frame image is not consistent, transmitting the data in the whole area of the current frame image to a compression engine for compression; the display data area division diagram is shown in fig. 2; the actual execution method for dividing the n regions is to set the initial addresses and the sizes of R0-Rn, and the cache data transmission is actually the address transmission, so that the consumption of hardware performance and processing time caused by data copying is avoided;
module M4.2: the video comparison module initializes a comparison start position as R0, Rinitial as R0, and sets a current comparison position as R0: the initial comparison sequence is R0- > R1- > R2- >, the sequence is repeated, and each time one round of comparison is finished (Rcompare-ringing-n-1), the current frame buffer and the previous frame buffer are updated;
module M4.3: the design realizes a cache exchange management module, and the work of cache allocation, cache address transmission, comparison area setting and the like is managed in a unified way.
Preferably, said module M4 comprises:
module M4.4: the comparison sequence of R0-Rn is automatically adjusted according to the position of the current mouse, the RFB server is responsible for receiving the position data of the mouse in real time, calculating the area where the current mouse is located, setting the area as Ra, storing the last area as Ra-1, and judging whether Ra is changed relative to Ra-1;
module M4.5: when the mouse position changes to cause the change of the area (R0-Rn) where the mouse is located and the changed area is assumed to be Ra, the RFB server informs the cache exchange management module, and the cache exchange management module executes the setting: where r denotes Ra, the next comparison region is Ra.
Preferably, the module M5 includes:
module M5.1: and constructing an RFB server software module according to video data cache and management result information, finishing video data transmission and screen refresh control by adopting an RFB light protocol based on jpeg data compressed by a 2D video engine hardware module and region division information provided by the video data cache management software module, realizing refresh in a specified region and acquiring refresh result information of the specified region.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention reduces the processing work of redundant data coding compression and network transmission and improves the display quality. Due to the locally changing characteristics of screen video data, data between adjacent frames is mostly identical, resulting in a considerable degree of repeated redundant data for encoding compression and network transmission data.
2. The invention improves the response speed of the interface interactive operation of the remote control end. The display system with the mouse has the characteristics that when the position of the mouse changes, the change of a display picture usually occurs near the position of the mouse, a strategy is designed and realized according to the change, when a video is compared, an area to be compared is set to be the area where the current mouse is located in real time according to the change of the position of the mouse, and compression transmission is preferentially carried out;
3. in the invention, the design of the hardware module in the aspect of video is basically consistent with that of a BMC chip popular in the market, and the hardware module can be compatible with a universal KVM implementation scheme and has good applicability;
4. in the invention, the data volume of actual compression transmission is small, and a large amount of network bandwidth can be saved, so that higher-quality remote image display can be supported;
5. according to the invention, the strategy of preferentially updating the display area of the mouse can more quickly feed back the change of the display picture to the client, so that the delay is effectively reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a KVM implementation architecture according to the present invention.
FIG. 2 is a schematic diagram of display data area division according to the present invention.
FIG. 3 is a schematic diagram of a Video Buffer module according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
A realization system for KVM image high-speed redirection based on a domestic BMC chip comprises the following core modules:
VGA driver software module. The method is customized for a domestic BMC chip, and is responsible for acquiring RGB data of each frame of video to a designated block in a video data cache region, and other modules can access the RGB data through opening of an operating system.
2. And a video comparison software module. And comparing the current frame in the video data buffer area with the selected area of the previous frame to judge whether the current frame and the previous frame are consistent.
And the 3.2D video engine hardware module is used for realizing jpeg hardware compression on the video data specified by the video data cache management module.
4. And the video data cache management software module. The video data is cached and managed, a frame display data area is divided into Rn areas aiming at a current frame and a previous frame, one whole area is selected at a time and is sent to a video comparison software module for comparison, namely, the selected area is taken as a range, the stored data in the area of the previous frame and the data in the area of the current frame are sent to the video comparison software module for comparison, whether compression is needed or not is judged, and if compression is needed, the data in the area of the current frame is sent to a 2D video engine hardware module for decompression.
And 5, an RFB server software module, which adopts an RFB light protocol to complete video data transmission and screen refreshing control based on jpeg data compressed by the 2D video engine hardware module and the region division information provided by the video data cache management software module, so as to realize refreshing in a specified region.
And the RFB client software module receives the video data and the protocol information sent by the RFB server software module based on the RFB Right protocol, decompresses the video data and the protocol information by the web player and refreshes and displays the video data and the protocol information in a specified area.
A Web UI software module as a Web page framework supporting KVM video Web player.
The video data cache management software module relates to data and control interaction with a plurality of modules, and is also a key main control module for realizing efficient area comparison, a module design drawing of the video data cache management software module is shown in figure 3, and key technical points are as follows:
1. aiming at the characteristic that VGA display output is scanned line by line from the upper left corner, dividing video RGB data into n areas from top to bottom, comparing one whole area at a time, namely, taking the selected area as a range, comparing the stored data in the area of the previous frame image with the data in the area of the current frame, and if the data in the whole area of the current frame image is not consistent, transmitting the data in the whole area of the current frame image to a compression engine for compression. The display data area division diagram is shown in fig. 2.
2. The actual execution method for dividing the n regions is to set the initial addresses and the sizes of R0-Rn, and the cache data transmission is actually the address transmission, so that the consumption of hardware performance and processing time caused by data copying is avoided.
3. The video comparison module initializes a comparison start position as R0: rinitial ═ R0, and set the current comparison position to R0: the comparison sequence is R0- > R1- > R2- >, the comparison sequence is R-Rn- > R0- > R1- >. the loop is repeated, and the current frame buffer and the previous frame buffer are updated once every time one round of comparison (Rcompare-ringing-n-1) is finished.
4. The design realizes a cache exchange management module, and the work of cache allocation, cache address transmission, comparison area setting and the like is managed in a unified way.
And 5, the comparison sequence of R0-Rn is automatically adjusted according to the position of the current mouse, the RFB server is responsible for receiving the position data of the mouse in real time, calculating the area where the current mouse is located, setting the area as Ra, storing the last area as Ra-1 and judging whether Ra is changed relative to Ra-1.
6. When the mouse position changes to cause the change of the area (R0-Rn) where the mouse is located and the changed area is assumed to be Ra, the RFB server informs the cache exchange management module, and the cache exchange management module executes the setting: where r denotes Ra, the next comparison region is Ra.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (8)
1. A realization method for KVM image high-speed redirection based on a domestic BMC chip is characterized by comprising the following steps:
step S1: constructing a VGA driving software module, exporting video data and acquiring video data export result information;
step S2: according to the video data export result information, a video comparison module is constructed and realized, the current frame in a video data cache region is compared with the selected region of the previous frame, whether the current frame is consistent with the selected region is judged, and region consistency judgment result information is obtained;
step S3: according to the region consistency judgment result information, a 2D video engine hardware module is constructed, so that the video data specified by the video data cache management module is subjected to jpeg hardware compression, and hardware compression result information is obtained;
step S4.1: aiming at the characteristic that VGA display output is scanned line by line from the upper left corner, dividing video RGB data into n areas from top to bottom, comparing one whole area at a time, namely, taking the selected area as a range, comparing the stored data in the area of the previous frame image with the data in the area of the current frame, and if the data in the whole area of the current frame image is not consistent, transmitting the data in the whole area of the current frame image to a compression engine for compression; displaying a data area division diagram; the actual execution method for dividing the n regions is to set the initial addresses and the sizes of R0-Rn, and the cache data transmission is actually the address transmission, so that the consumption of hardware performance and processing time caused by data copying is avoided;
step S4.2: the video comparison module initializes a comparison start position as R0, Rinitial as R0, and sets a current comparison position as R0: the initial comparison sequence is R0- > R1- > R2- >, the sequence is repeated in such a way, and each time one round of comparison is finished, the current frame buffer and the previous frame buffer are updated once;
step S4.3: designing a module for realizing cache exchange management, and uniformly managing cache allocation, cache address transmission and comparison area setting work;
step S4.4: the comparison sequence of R0-Rn is automatically adjusted according to the position of the current mouse, the RFB server is responsible for receiving the position data of the mouse in real time, calculating the area where the current mouse is located, setting the area as Ra, storing the last area as Ra-1, and judging whether Ra is changed relative to Ra-1;
step S4.5: when the mouse position changes to cause the area where the mouse is located to change and the area where the mouse is located after the change is Ra, the RFB server informs the cache exchange management module, and the cache exchange management module executes setting: rinitial and Rcompare Ra, namely the next comparison area is Ra;
step S4.6: acquiring video data cache and managing result information;
step S5: constructing an RFB server software module according to video data cache and management result information, realizing refreshing in a specified area based on jpeg data compressed by a 2D video engine hardware module and area division information provided by the video data cache management software module, and acquiring refresh result information of the specified area;
step S6: constructing and realizing an RFB client software module according to the refresh result information of the designated area, receiving video data and protocol information sent by an RFB server software module based on an RFB Tight protocol, decompressing by a web player and then refreshing and displaying in the designated area, and acquiring the refresh display result information of the web player in the designated area after decompression;
step S7: and refreshing display result information in a designated area after the Web player is decompressed, constructing a Web UI software module serving as a Web page frame for supporting the KVM video Web player, and acquiring the realization result information of the KVM image high-speed redirection based on the domestic BMC chip.
2. The method for implementing high-speed redirection of KVM images based on homemade BMC chip of claim 1, wherein step S1 comprises:
step S1.1: and customizing a VGA driving software module aiming at a domestic BMC chip, and collecting RGB data of each frame of video to a specified block in a video data cache region.
3. The method for implementing high-speed redirection of KVM images based on homemade BMC chip of claim 1, wherein step S1 comprises:
step S1.3: and opening the video data cache region through the operating system so that the shared memory module can access the video data cache region.
4. The method for implementing high-speed redirection of KVM images based on homemade BMC chip of claim 1, wherein step S5 comprises:
step S5.1: and constructing an RFB server software module according to video data cache and management result information, finishing video data transmission and screen refresh control by adopting an RFB light protocol based on jpeg data compressed by a 2D video engine hardware module and region division information provided by the video data cache management software module, realizing refresh in a specified region and acquiring refresh result information of the specified region.
5. A realization system for KVM image high-speed redirection based on a domestic BMC chip is characterized by comprising:
module M1: constructing a VGA driving software module, exporting video data and acquiring video data export result information;
module M2: according to the video data export result information, a video comparison module is constructed and realized, the current frame in a video data cache region is compared with the selected region of the previous frame, whether the current frame is consistent with the selected region is judged, and region consistency judgment result information is obtained;
module M3: according to the region consistency judgment result information, a 2D video engine hardware module is constructed, so that the video data specified by the video data cache management module is subjected to jpeg hardware compression, and hardware compression result information is obtained;
module M4.1: aiming at the characteristic that VGA display output is scanned line by line from the upper left corner, dividing video RGB data into n areas from top to bottom, comparing one whole area at a time, namely, taking the selected area as a range, comparing the stored data in the area of the previous frame image with the data in the area of the current frame, and if the data in the whole area of the current frame image is not consistent, transmitting the data in the whole area of the current frame image to a compression engine for compression; displaying a data area division diagram; the actual execution method for dividing the n regions is to set the initial addresses and the sizes of R0-Rn, and the cache data transmission is actually the address transmission, so that the consumption of hardware performance and processing time caused by data copying is avoided;
module M4.2: the video comparison module initializes a comparison start position as R0, Rinitial as R0, and sets a current comparison position as R0: the initial comparison sequence is R0- > R1- > R2- >, the sequence is repeated in such a way, and each time one round of comparison is finished, the current frame buffer and the previous frame buffer are updated once;
module M4.3: designing a module for realizing cache exchange management, and uniformly managing cache allocation, cache address transmission and comparison area setting work;
module M4.4: the comparison sequence of R0-Rn is automatically adjusted according to the position of the current mouse, the RFB server is responsible for receiving the position data of the mouse in real time, calculating the area where the current mouse is located, setting the area as Ra, storing the last area as Ra-1, and judging whether Ra is changed relative to Ra-1;
module M4.5: when the mouse position changes to cause the area where the mouse is located to change and the area where the mouse is located after the change is Ra, the RFB server informs the cache exchange management module, and the cache exchange management module executes setting: rinitial and Rcompare Ra, namely the next comparison area is Ra;
module M4.6: acquiring video data cache and managing result information;
module M5: constructing an RFB server software module according to video data cache and management result information, realizing refreshing in a specified area based on jpeg data compressed by a 2D video engine hardware module and area division information provided by the video data cache management software module, and acquiring refresh result information of the specified area;
module M6: constructing and realizing an RFB client software module according to the refresh result information of the designated area, receiving video data and protocol information sent by an RFB server software module based on an RFB Tight protocol, decompressing by a web player and then refreshing and displaying in the designated area, and acquiring the refresh display result information of the web player in the designated area after decompression;
module M7: and refreshing display result information in a designated area after the Web player is decompressed, constructing a Web UI software module serving as a Web page frame for supporting the KVM video Web player, and acquiring the realization result information of the KVM image high-speed redirection based on the domestic BMC chip.
6. The system for implementing high-speed redirection of KVM image based on domestic BMC chip of claim 5, wherein module M1 comprises:
module M1.1: and customizing a VGA driving software module aiming at a domestic BMC chip, and collecting RGB data of each frame of video to a specified block in a video data cache region.
7. The system for implementing high-speed redirection of KVM image based on domestic BMC chip of claim 5, wherein module M1 comprises:
module M1.3: and opening the video data cache region through the operating system so that the shared memory module can access the video data cache region.
8. The system for implementing high-speed redirection of KVM image based on domestic BMC chip of claim 5, wherein module M5 comprises:
module M5.1: and constructing an RFB server software module according to video data cache and management result information, finishing video data transmission and screen refresh control by adopting an RFB light protocol based on jpeg data compressed by a 2D video engine hardware module and region division information provided by the video data cache management software module, realizing refresh in a specified region and acquiring refresh result information of the specified region.
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