CN105657369A - Rapid response video monitoring method and system based on Linux system - Google Patents
Rapid response video monitoring method and system based on Linux system Download PDFInfo
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- CN105657369A CN105657369A CN201610013895.1A CN201610013895A CN105657369A CN 105657369 A CN105657369 A CN 105657369A CN 201610013895 A CN201610013895 A CN 201610013895A CN 105657369 A CN105657369 A CN 105657369A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
Abstract
The invention provides a rapid response video monitoring method based on a Linux system. The method comprises that a video monitoring Camcap module is set in the Linux system; the video monitoring Camcap module reads video monitoring data from an kernel driver V4L2 through ioctl system invoking and transmits the data to a kernel FB (frame buffer) for operation through ioctl system invoking; the video monitoring Camcap module obtains video data through Linux system invoking of the kernel driver V4L2 and transits the video data to a screen for display through Linux system invoking of the kernel FB, thus finishing the rapid response of the Linux system. The invention also provides a video monitoring method based on the rapid response of the Linux system. According to the method and the system provided by the invention, the original boot sequence of the system is not influenced; special modifications aiming at different sensors are unnecessary; and the rapid response is carried out to the video monitoring.
Description
Technical field
The present invention relates to technical field of video monitoring, particularly relate to video frequency monitoring method and the system of a kind of quickly response based on linux system.
Background technology
The startup of AndroidLinux system is divided into four-stage, as shown in Figure 1:
(1) startup stage of BootLoader;
(2) startup stage of Linuxkernel;
(3) root file system (rootfs) loads, and starts the system-based service of some keys;
(4) loading of Android host file system (system), starts the function that android system is relevant, until the main interface of Android. Appeal four-stage is required for responding some times, and such linux system could start completely.
For one based on AndroidLinux systematic difference, it is generally divided into two parts: kernel-driven part, the application part of client layer. For video monitoring function, kernel-driven is called V4L2, and the application of client layer is called that V4L2 applies, and he calls kernel-driven V4L2 by system and drives, and obtains video monitoring data.
For a conventional video surveillance applications based on Android, whole flow process as shown in Figure 2:
Video surveillance applications CameraAPP is the java APP application program write, it obtains monitoring data by these Android infrastructure components of media services MediaService, CameraHardwareInterface interface from kernel-driven V4L2, then servicing again through SurfaceFlinger, utilize hardware accelerator to complete view data synthesize and this display path of function HWC of showing is rendered to data in kernel FB (framebuffer) driving, the monitoring image made is eventually displayed on screen.
But MediaService (media services), CameraHardwareInterface interface, SurfaceFlinger service, HWC (utilizing hardware accelerator to complete the function that view data synthesizes and shows) these assemblies all could must work after Android host file system loads, video surveillance applications CameraAPP wants whole android system to start especially, could start after entering main interface. If so relying on this traditional framework, cold-starting automobile, it is thus achieved that the process of vehicle backing backsight image will be very slow, it is necessary to the about time of about 40s.
In some special application field, it is desirable to video monitoring equipment can quickly respond, catch monitoring image in time. Reverse backsight system on such as automobile, it is necessary to just can show vehicle backing backsight image within the several seconds of automobile starting on screen. As disclosed in prior art " a kind of method of quick display reverse image and car machine system ", publication number is: the Chinese patent of CN103522949A; Namely this patent realizes the reverse backsight system on automobile.
Scheme traditional at present is the mode adopting single-chip microcomputer (MCU)+master control (AP), runs one section of small routine on MCU single-chip microcomputer, when cold-starting automobile, controls monitoring camera and gathers image, then show on screen. The main system run in AP master control simultaneously also begins to start, after waiting that main system has started, from the follow-up relevant video monitoring service of MCU upper connecting tube. The advantage of this traditional scheme is that MCU response is rapid, it is possible to imaging faster. But one MCU of many increases, can increase a lot on hardware cost. As name is called: " a kind of method of quick startup reverse image, system and car machine system ", publication number is: the Chinese patent of CN103522961A; This patent is namely by the mode of single-chip microcomputer (MCU)+master control (AP).
Simultaneously, a kind of mode the more commonly used at present be flame-out after do standby, next time, igniting directly woke up, this scheme automobile storage battery is had unpredictable risk, if do not opened for a long time, likely the electricity of storage battery can be depleted, it is also possible to occurs abnormal when existing standby, causes not having standby going down to directly result in storage battery electric quantity consumption and falling. And, after the method is only applicable to automobile starting, the situation of reversing is started from dormancy holding state, the problem that cannot solve the quickly response reversing monitoring of automobile first time cold start-up, as name is called: " reverse backsight system of a kind of quick response and method ", publication number is: the Chinese patent of CN102756691A; This patent is namely standby with doing after stopping working.
Also have one realize method be kernel arrange over there a device drives go poll always whether move backward then switching image on screen, this method can take total available machine time, versatility is not strong, need in a lot of function of kernel development, this is very restricted, the sensor Sensor of the picture that applies in general to directly to publish picture. As name is called: " a kind of vehicle-mounted Android platform accelerates the method for back-up video display time ", publication number is: the Chinese patent of CN102756700A, and this patent is namely by the mode arranging a device drives and going poll always.
Summary of the invention
One of the technical problem to be solved in the present invention, is in that to provide the video monitoring system of a kind of quickly response based on linux system, easily transplants general, that influential system is not original boot sequence, can video monitoring quickly be responded.
One of problem of the present invention is achieved in that the video monitoring system of a kind of quickly response based on linux system, and described video monitoring system includes: kernel FB and kernel-driven V4L2; Described video monitoring system includes video monitoring Camcap module;
Described video monitoring Camcap module is read video monitoring data from kernel-driven V4L2 by ioctl function and is operated to kernel FB by ioctl function passes; Described video monitoring Camcap module calls acquisition video data by the linux system of kernel-driven V4L2, then calls again through the linux system of kernel FB and video data is delivered on screen and displays, thus completing the quick response of linux system.
Further, described video monitoring Camcap module adopts the service module that pure C language realizes, and video monitoring Camcap module is after Android root file system carry, by init process initiation; Described video monitoring Camcap module can be passed through order line and receive the relevant parameter that arranges, and described relevant arrange parameter and includes: the monitor video device node parameter that open, or the resolution parameter of video image.
Further, described video monitoring system also includes reversing detection notice module,
In the process that linux system starts, reversing detection notice module can circularize the video monitoring Camcap module of kernel FB and user's space after astern signal being detected; After video monitoring Camcap module receives the reversing notice that linux kernel sends, reading video data from kernel-driven V4L2, then by video data through processing, it is delivered to kernel FB; The video data that user's space difference service delivery can be got off after receiving reversing notice by the FB of linux kernel distinguishes, described different service includes video monitoring Camcap module service and SurfaceFlinger service, the video data that only process video monitoring Camcap module service by name is delivered just can be sent on display screen display, and the data that other service processes are delivered can be simply discarded; Such user is on the display screen it is seen that normal vehicle backing backsight image; When reversing terminates, reversing end signal can be issued the FB of linux kernel and the video monitoring Camcap module of user's space by the reversing detection notice module in linux kernel, and video monitoring Camcap module can stop after receiving reversing end signal delivering reverse image data to kernel FB; After the FB of linux kernel receives the signal that reversing terminates, the video data that other service delivery of Android get off is delivered on display screen and shows.
The two of the technical problem to be solved in the present invention, are in that to provide the video frequency monitoring method of a kind of quickly response based on linux system, the boot sequence that influential system is not original, can video monitoring quickly be responded.
The two of problem of the present invention are achieved in that the video frequency monitoring method of a kind of quickly response based on linux system, and described method is:
Setting a video monitoring Camcap module in linux system, video monitoring Camcap module is read video monitoring data from kernel-driven V4L2 by ioctl function and is operated to kernel FB by ioctl function passes; Described video monitoring Camcap module calls acquisition video data by the linux system of kernel-driven V4L2, then calls again through the linux system of kernel FB and video data is delivered on screen and displays, thus completing the quick response of linux system.
Further, described video monitoring Camcap module adopts the service module that pure C language realizes, and video monitoring Camcap module is after Android root file system carry, by init process initiation; Described video monitoring Camcap module can be passed through order line and receive the relevant parameter that arranges, and described relevant arrange parameter and includes: the monitor video device node parameter that open, or the resolution parameter of video image.
Further, clashing to prevent from showing on screen that Android boot animation and android system user interface and video monitoring show, described method also sets up a reversing detection notice module,
In the process that linux system starts, reversing detection notice module can circularize the video monitoring Camcap module of kernel FB and user's space after astern signal being detected;After video monitoring Camcap module receives the reversing notice that linux kernel sends, reading video data from kernel-driven V4L2, then by video data through processing, it is delivered to kernel FB; The video data that user's space difference service delivery can be got off after receiving reversing notice by the FB of linux kernel distinguishes, described different service includes video monitoring Camcap module service and SurfaceFlinger service, the video data that only process video monitoring Camcap module service by name is delivered just can be sent on display screen display, and the data that other service processes are delivered can be simply discarded; Such user is on the display screen it is seen that normal vehicle backing backsight image; When reversing terminates, reversing end signal can be issued the FB of linux kernel and the video monitoring Camcap module of user's space by the reversing detection notice module in linux kernel, and video monitoring Camcap module can stop after receiving reversing end signal delivering reverse image data to kernel FB; After the FB of linux kernel receives the signal that reversing terminates, the video data that other service delivery of Android get off is delivered on display screen and shows.
Present invention have the advantage that the present invention reasonably disassembles by each stage of AndroidLinux system start-up is done, make full use of the characteristic of linux system, shorten the time that System guides starts to kernel, simultaneously for versatility, process is serviced with the Init stage showing system of putting into by monitoring reversing, the boot sequence that influential system is not original, need not make special amendment for different sensor Sensor, can video monitoring quickly be responded.
Accompanying drawing explanation
Fig. 1 is existing Android Booting sequence schematic diagram.
Fig. 2 is existing Android video monitoring framework.
Fig. 3 is the system framework figure of the present invention.
Detailed description of the invention
Refer to shown in Fig. 3, the video monitoring system of a kind of quickly response based on linux system of the present invention, described video monitoring system includes: kernel FB and kernel-driven V4L2; Described video monitoring system includes video monitoring Camcap module;
Described video monitoring Camcap module is called by ioctl system and is read video monitoring data from kernel-driven V4L2 and called by ioctl system and pass to kernel FB and be operated; Described video monitoring Camcap module calls acquisition video data by the linux system of kernel-driven V4L2, then call again through the linux system of kernel FB and video data is delivered on screen and displays, realize this function completely around media services MediaService, CameraHardwareInterface interface, SurfaceFlinger service, these assemblies relying on android system of HWC and video surveillance applications CameraAPP. Thus completing the quick response of linux system.
Wherein, described video monitoring Camcap module adopts the service module that pure C language realizes, and video monitoring Camcap module is after Android root file system carry, by init process initiation; (present invention is formally by adopting pure C to realize video monitoring Camcap module, after root file system carry, directly use init process, improve fast-response time) described video monitoring Camcap module can pass through order line and receive and relevant arrange parameter, described relevant parameter is set includes: the monitor video device node parameter that open, or the resolution parameter of video image.
After Android root file system carry, then can carry Android host file system, at this time Android related service can be started by sequence, the image rendering process surfacflinger service of Android also can operate kernel FB, will show Android boot animation, android system UI (user interface) on screen.This will conflict with vehicle backing backsight monitor video.
In order to solve this problem, described video monitoring system also includes reversing detection notice module,
In the process that linux system starts, reversing detection notice module can circularize the video monitoring Camcap module of kernel FB and user's space after astern signal being detected; After video monitoring Camcap module receives the reversing notice that linux kernel sends, reading video data from kernel-driven V4L2, then by video data through processing, it is delivered to kernel FB; The video data that user's space difference service delivery can be got off after receiving reversing notice by the FB of linux kernel distinguishes, described different service includes video monitoring Camcap module service and SurfaceFlinger service, the video data that only process video monitoring Camcap module service by name is delivered just can be sent on display screen display, and the data that other service processes are delivered can be simply discarded; Such user is on the display screen it is seen that normal vehicle backing backsight image; When reversing terminates, reversing end signal can be issued the FB of linux kernel and the video monitoring Camcap module of user's space by the reversing detection notice module in linux kernel, and video monitoring Camcap module can stop after receiving reversing end signal delivering reverse image data to kernel FB; After the FB of linux kernel receives the signal that reversing terminates, the video data that other service delivery of Android get off is delivered on display screen and shows. Thus achieve the quick response of vehicle backing backsight image under cold start mode, and can switch flexibly with Android main system image.
When backsight Camera is USBCamera, overwhelming majority scheme is all realize by standby mode at present, if normal boot-strap realizes at least at more than 10S, as long as adopting near present invention 5S.
When backsight Camera is CVBS input, overwhelming majority scheme adopts the scheme (near 1-2S) increasing hardware or plays image (near 3S) in the kernel stage at present, but all there is increase cost, and poor universality, the problem of poor stability. The present invention easily transplants general, and the time is probably at 3-4S.
A kind of video frequency monitoring method of the quickly response based on linux system of the present invention, described method is:
Setting a video monitoring Camcap module in linux system, video monitoring Camcap module is called by ioctl system and is read video monitoring data from kernel-driven V4L2 and called by ioctl system and pass to kernel FB and be operated; Described video monitoring Camcap module calls acquisition video data by the linux system of kernel-driven V4L2, then calls again through the linux system of kernel FB and video data is delivered on screen and displays, thus completing the quick response of linux system.
Wherein, described video monitoring Camcap module adopts the service module that pure C language realizes, and video monitoring Camcap module is after Android root file system carry, by init process initiation; Described video monitoring Camcap module can be passed through order line and receive the relevant parameter that arranges, and described relevant arrange parameter and includes: the monitor video device node parameter that open, or the resolution parameter of video image.
Clashing to prevent from showing on screen that Android boot animation and android system user interface and video monitoring show, described method also sets up a reversing detection notice module,
In the process that linux system starts, reversing detection notice module can circularize the video monitoring Camcap module of kernel FB and user's space after astern signal being detected;After video monitoring Camcap module receives the reversing notice that linux kernel sends, reading video data from kernel-driven V4L2, then by video data through processing, it is delivered to kernel FB; The video data that user's space difference service delivery can be got off after receiving reversing notice by the FB of linux kernel distinguishes, described different service includes video monitoring Camcap module service and SurfaceFlinger service, the video data that only process video monitoring Camcap module service by name is delivered just can be sent on display screen display, and the data that other service processes are delivered can be simply discarded; Such user is on the display screen it is seen that normal vehicle backing backsight image; When reversing terminates, reversing end signal can be issued the FB of linux kernel and the video monitoring Camcap module of user's space by the reversing detection notice module in linux kernel, and video monitoring Camcap module can stop after receiving reversing end signal delivering reverse image data to kernel FB; After the FB of linux kernel receives the signal that reversing terminates, the video data that other service delivery of Android get off is delivered on display screen and shows.
It addition, by the method for the present invention, wherein four startup stage the time all reduce:
(1) startup stage of BootLoader, after reasonably optimizing, this stage is consuming time general at about 1.4s.
(2), the startup stage of Linuxkernel, through reasonably optimizing, major function can complete in 1.5s.
(3) root file system (rootfs) loads, and starts the system-based service of some keys, and this step starts after Linuxkernel starts 1.5s.
(4) loading of Android host file system (system), starts the function that android system is relevant, until the main interface of Android, this step starts about 4s at Linuxkernel, and whole process completes general at about 30s.
The present invention starts video monitoring Camcap module after (3rd) step completes, it is not necessary to wait (4th) step, it is possible to improve response time greatly.
In a word, the present invention reasonably disassembles by each stage of AndroidLinux system start-up is done, make full use of the characteristic of linux system, shorten the time that System guides starts to kernel, simultaneously for versatility, service process by monitoring reversing with the Init stage showing system of putting into, the boot sequence that influential system is not original, special amendment need not be made for different sensor Sensor, video monitoring quickly can be responded.
The foregoing is only presently preferred embodiments of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of the present invention.
Claims (6)
1., based on a video monitoring system for the quickly response of linux system, described video monitoring system includes: kernel FB and kernel-driven V4L2; It is characterized in that: described video monitoring system includes video monitoring Camcap module;
Described video monitoring Camcap module is called by ioctl system and is read video monitoring data from kernel-driven V4L2 and called by ioctl system and pass to kernel FB and be operated; Described video monitoring Camcap module calls acquisition video data by the linux system of kernel-driven V4L2, then calls again through the linux system of kernel FB and video data is delivered on screen and displays, thus completing the quick response of linux system.
2. the video monitoring system of the quickly response based on linux system according to claim 1, it is characterized in that: described video monitoring Camcap module adopts the service module that pure C language realizes, video monitoring Camcap module is after Android root file system carry, by init process initiation;Described video monitoring Camcap module can be passed through order line and receive the relevant parameter that arranges, and described relevant arrange parameter and includes: the monitor video device node parameter that open, or the parameter such as the resolution of video image.
3. the video monitoring system of the quickly response based on linux system according to claim 1, it is characterised in that: described video monitoring system also includes reversing detection notice module,
In the process that linux system starts, reversing detection notice module can circularize the video monitoring Camcap module of kernel FB and user's space after astern signal being detected; After video monitoring Camcap module receives the reversing notice that linux kernel sends, reading video data from kernel-driven V4L2, then by video data through processing, it is delivered to kernel FB; The video data that user's space difference service delivery can be got off after receiving reversing notice by the FB of linux kernel distinguishes, described different service includes video monitoring Camcap module service and SurfaceFlinger service, the video data that only process video monitoring Camcap module service by name is delivered just can be sent on display screen display, and the data that other service processes are delivered can be simply discarded; Such user is on the display screen it is seen that normal vehicle backing backsight image; When reversing terminates, reversing end signal can be issued the FB of linux kernel and the video monitoring Camcap module of user's space by the reversing detection notice module in linux kernel, and video monitoring Camcap module can stop after receiving reversing end signal delivering reverse image data to kernel FB; After the FB of linux kernel receives the signal that reversing terminates, no longer receive the video data that camcap process is relevant, the video data that other service delivery of Android get off is delivered on display screen simultaneously and shows.
4. the video frequency monitoring method based on the quickly response of linux system, it is characterised in that: described method is:
Setting a video monitoring Camcap module in linux system, video monitoring Camcap module is called by ioctl system and is read video monitoring data from kernel-driven V4L2 and called by ioctl system and pass to kernel FB and be operated; Described video monitoring Camcap module calls acquisition video data by the linux system of kernel-driven V4L2, then calls again through the linux system of kernel FB and video data is delivered on screen and displays, thus completing the quick response of linux system.
5. the video frequency monitoring method of the quickly response based on linux system according to claim 4, it is characterized in that: described video monitoring Camcap module adopts the service module that pure C language realizes, video monitoring Camcap module is after Android root file system carry, by init process initiation; Described video monitoring Camcap module can be passed through order line and receive the relevant parameter that arranges, and described relevant arrange parameter and includes: the monitor video device node parameter that open, or the resolution parameter of video image.
6. the video monitoring system of the quickly response based on linux system according to claim 4, it is characterized in that: clash to prevent from screen shows that Android boot animation and android system user interface and video monitoring show, described method also sets up a reversing detection notice module
In the process that linux system starts, reversing detection notice module can circularize the video monitoring Camcap module of kernel FB and user's space after astern signal being detected;After video monitoring Camcap module receives the reversing notice that linux kernel sends, reading video data from kernel-driven V4L2, then by video data through processing, it is delivered to kernel FB; The video data that user's space difference service delivery can be got off after receiving reversing notice by the FB of linux kernel distinguishes, described different service includes video monitoring Camcap module service and SurfaceFlinger service, the video data that only process video monitoring Camcap module service by name is delivered just can be sent on display screen display, and the data that other service processes are delivered can be simply discarded; Such user is on the display screen it is seen that normal vehicle backing backsight image; When reversing terminates, reversing end signal can be issued the FB of linux kernel and the video monitoring Camcap module of user's space by the reversing detection notice module in linux kernel, and video monitoring Camcap module can stop after receiving reversing end signal delivering reverse image data to kernel FB; After the FB of linux kernel receives the signal that reversing terminates, the video data that other service delivery of Android get off is delivered on display screen and shows.
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| CN108248509A (en) * | 2018-01-17 | 2018-07-06 | 深圳市路畅科技股份有限公司 | A kind of method, apparatus that reverse image is controlled to show and automatic navigator |
| CN109766144A (en) * | 2019-01-22 | 2019-05-17 | 湖北亿咖通科技有限公司 | A kind of control event response method and device |
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| CN110362518A (en) * | 2019-04-15 | 2019-10-22 | 珠海全志科技股份有限公司 | A method of go out when for System guides and schemes and be smoothly transitted into kernel |
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| CN111552516A (en) * | 2020-05-19 | 2020-08-18 | 马瑞利汽车电子(广州)有限公司 | Rapid starting method of automobile electronic instrument integrated with backing image module |
| CN111552516B (en) * | 2020-05-19 | 2022-03-29 | 马瑞利汽车电子(广州)有限公司 | Rapid starting method of automobile electronic instrument integrated with backing image module |
| CN112040173A (en) * | 2020-07-20 | 2020-12-04 | 南斗六星系统集成有限公司 | Method for rapidly displaying reversing video through Android car machine system |
| CN112100409A (en) * | 2020-09-22 | 2020-12-18 | 展讯半导体(成都)有限公司 | Multimedia information display method and device, storage medium and terminal |
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Address after: 350000 building, No. 89, software Avenue, Gulou District, Fujian, Fuzhou 18, China Patentee after: Ruixin Microelectronics Co., Ltd Address before: 350000 building, No. 89, software Avenue, Gulou District, Fujian, Fuzhou 18, China Patentee before: Fuzhou Rockchips Electronics Co.,Ltd. |