CN105391985A - Embedded Linux based video monitoring system and method - Google Patents
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Abstract
The invention relates to the field of monitoring technology, especially to an embedded Linux based video monitoring system and method. The system and method can be used to establish a software platform of the embedded network video monitoring system, the embedded development cross-compiling environment is established, and transplantation of an embedded Linux operating system of an OMAP4460 development board further comprises preparation and transplantation of U-boot, transplantation of the Linux kernel and establishment of a root file system. The system and method are low in cost and capable of video code processing, network communication, multifunctional control and the like, support network video transmission and network management directly, enable the monitoring range to be wide unprecedentedly, and improve the video image processing efficiency.
Description
Technical field
The present invention relates to monitoring technique field, particularly relate to a kind of video monitoring system based on built-in Linux and method.
Background technology
In the research based on built-in Linux video monitoring system, be domesticly still in the starting stage at present, relative in external or falling behind one cuts greatly, abroad due to the maturation of basic theory and relevant supporting technology, oneself is through there being the product of comparative maturity to emerge.Because manufacturer large abroad such as Sony, three magnitudes have very strong research and development strength, and starting comparatively early, this embedded video monitoring system field deep ploughing, so external product be no matter be better than from performance or technological design aspect or generally compare domestic, but because external producer grasps core technology, its product price is also very expensive, generally exceeds one than domestic like product and cuts greatly, and most of domestic user cannot accept their price.
Domestic like product and external product adopt wavelet compression mode difference to be all to adopt hardware-compressed mode, use special video compression chip, well imagine to have in performance like this and significantly promote, but due to adopt hard compress technique along with and the such as product renewing that comes is not be just easy to.
The analog video monitoring started most, analog video monitoring function is simple, and poor reliability, is easily disturbed, and lifetime of system is short.
Summary of the invention
For the defect existed in prior art or deficiency, technical problem to be solved by this invention is: provide a kind of video monitoring system based on built-in Linux and method, its cost is low, possess the functions such as Video coding process, network service, multi-functional control, direct network enabled transmission of video and network management, make monitoring range reach unprecedented height, improve the efficiency of Computer Vision.
To achieve these goals, the technical scheme that the present invention takes, for providing a kind of video monitoring system based on built-in Linux and method, comprises the following steps:
A. embedded system development environment is built, build the environment of host and vkboard development board respectively, complete host service configuration comprise configuration nfs server and TFTP mode start linux kernel, set up the communication between host and vkboard development board, namely carry out building of cross compilation environment;
B. carry out the transplanting of embedded Linux system at vkboard development board, comprising: the transplanting of Bootloader U-boot, the transplanting of linux kernel on vkboard development board;
C. the root file system being used for EMMC and starting is made.
As a further improvement on the present invention, in described steps A, TFTP mode starts linux kernel and comprises: host adopts the operating system of ubuntu12.04 version, a tftp server is set up in host ubuntu system, compiled uImage is put into ubuntu system, after vkboard development board starts, automatically by Network Capture uImage file, thus start up system.
As a further improvement on the present invention, described U-boot transplants and comprises: first stage first hardware device initialization, comprises system reset, arranges CPU mode of operation, shields all interruptions, carries out initialization to Memory Controller Hub and serial ports, arranges clock frequency, closes cpu instruction and data Cache etc.; Arrangement is reorientated to code, open up certain arbitrary access space be second stage bootloader load prepare, then the code of second stage is loaded into ram space; The storehouse jumping to second stage code entrance is set;
Second stage carries out bootloader loading, first initiating hardware equipment, then maps Installed System Memory; Load kernel and root file system, the start-up parameter of kernel is set; Finally start kernel.
As a further improvement on the present invention, described vkboard development board is transplanted the step of U-boot:
1) first decompress(ion) uboot source code:
2) at the u-boot-linaro-stale file that current directory will generate, enter into this catalogue, perform compilation process;
3) before make compiling, a lower platform is configured:
4) U-boot is compiled:
5) after having compiled, by the MLO file under u-boot-linaro-stale file and u-boot.img file transfer in SD card root file system, start up system.
As a further improvement on the present invention, in described step B, linux kernel is transplanted, described linux kernel is divided into three layers: the system call interfaces on the device driver of the bottom, intermediate layer, upper strata, and modules in linux kernel carries out encapsulating and provides the unified interface function of access bottom for upper strata by described system call interfaces; The step that linux kernel is transplanted is as follows:
1) the kernel version of vkboard, is downloaded;
2), enter into/kernel-omap4 catalogue under;
3), revise Makefile, under kernel catalogue, specify cross-compiler and make an amendment, and in system environment variable PATH, adding the absolute path of kernel;
4), from config.kern, optional configuration file is introduced;
5), transplantable kernel file is generated;
6), uImage is transferred to development board;
7), Reboot, can writing system be started.
As a further improvement on the present invention, the framework of described linux kernel comprises management of process, memory management, Virtual File System, network interface layer, interprocess communication, and each several part has cooperated the function of whole kernel mutually.
As a further improvement on the present invention, make the root file system being used for EMMC and starting in described step C, add emmc equipment at platform associative directory, make kernel can identify emmc equipment; Upper root file system is made of emmc comprises the following steps: after SD card start-up, order fdisk – l, just can identify mmcblk0 (SD card), mmcblk1 (emmc). partition format is carried out to mmcblk1, first copy in emmc with MLO, U-boot, uImage of generating before dd order, but skip 512 bytes that emmc starts, then be mmcblklp1 to emmc subregion behind this section of space, be then formatted as ext4; Finally under the mmcblk0p2 of sd card (rootfs file system) carry/tmp/sdrootfs catalogue, emmc equipment mmcblk1p1 also carry out/tmp/mmcrootfs, then perform copy command, finally make an emmc image file.
Based on a system for the video frequency monitoring method of built-in Linux, comprising:
Real Time Video Capture Module: utilize V4L2 driver framework to gather original video data, and data message is passed to Video Coding module by effective mode;
Coding module: the coded format of specifying by user, encodes to the original video data collected, and uses herein and H.264 encodes, and the data after coding are write into frame buffer administration module;
Embedded video server module: read frame data from frame buffer administration module, and its form of being wrapped with RTP by streaming technology is sent to client, client player is carried out decoding and is play; Embedded video server module comprises RTP packet encapsulation module, data packet compressing coding module, data packet transmission module;
Video transmission module: utilize streaming media transmission technique, realize the video image information that collects can in real time, high definition, to transmit fast;
Above-mentioned four functional modules all realized with the form of one or more thread in coding stage, operating system needs the execution of simultaneously dispatching multiple thread, often need between each functional module to communicate simultaneously, therefore need the inter-process communication mechanisms utilizing built-in Linux operating system to provide to carry out management of process scheduling.
As a further improvement on the present invention, the workflow of Real Time Video Capture Module is as follows:
1) collecting device of specifying is opened;
2) can judgment device support video acquisition function;
3) video acquisition form is set;
4) internal memory of store data is distributed;
5) information of buffer memory is passed through the space of memory-mapped mode to user;
6) start to gather video;
7) the caching frame data gathered are taken out;
8) by mmap map processed data cached joining the team fall in lines, realize circle collection;
9) collection of video is stopped;
10) video equipment is closed.
As a further improvement on the present invention, based on H.264 carrying out fgs encoder module to the video image collected: directly realize H.264 encoding from IO control command, the process of H.264 encoding is as follows:
1) open hardware encoding driving arrangement, use open function to realize, can judge whether to have opened successfully simultaneously; If can not successfully open, just exit;
2) address of decoder input buffer is obtained;
3) output buffer address pointer is returned equally;
4) V4L2 programming, read the data of camera collection and be directly passed to MFC input buffering, H.264 encode to it, the data after coding are put in output buffer.。
The invention has the beneficial effects as follows: its cost of the present invention is low, possess the functions such as Video coding process, network service, multi-functional control, direct network enabled transmission of video and network management, make monitoring range reach unprecedented height, improve the efficiency of Computer Vision.
Accompanying drawing explanation
Fig. 1 is that U-boot of the present invention transplants flow chart;
Fig. 2 is linux kernel structure chart of the present invention;
Fig. 3 is the mutual schematic diagram between video monitoring system internal module of the present invention;
Fig. 4 is the program flow diagram of video acquisition module of the present invention.
Embodiment
Illustrate below in conjunction with accompanying drawing and embodiment the present invention is further described.
As Fig. 1 to shown in, the invention provides a kind of video monitoring system based on built-in Linux and method, comprise the following steps:
A. embedded system development environment is built, build the environment of host and vkboard development board respectively, complete host service configuration comprise configuration nfs server and TFTP mode start linux kernel, set up the communication between host and vkboard development board, namely carry out building of cross compilation environment;
B. carry out the transplanting of embedded Linux system at vkboard development board, comprising: the transplanting of Bootloader U-boot, the transplanting of linux kernel on vkboard development board;
C. the root file system being used for EMMC and starting is made.
In described steps A, TFTP mode starts linux kernel and comprises: host adopts the operating system of ubuntu12.04 version, a tftp server is set up in host ubuntu system, compiled uImage is put into ubuntu system, after vkboard development board starts, automatically by Network Capture uImage file, thus start up system.Key step comprises: the first step, tftp server is set up in host ubuntu system, tftp server catalogue is /tftpboot, by in uImage file copy to/tftpboot, also copy uInitrd file (being arranged in omap4_video/built_images) to/tftpboot simultaneously.Second step, amendment boot.scr file, changes file and to the effect that indicates uboot and start kernel in which way.First a file (name is script_tftp.txt) is created.3rd step, fill order in host ubuntu system, creates boot.scr file.4th step, by boot.scr file copy in the FAT32 subregion of microSD card.Kernel is started with regard to configuration successful like this in tftp mode.
The concrete steps of configuration nfs server are as follows: 1, install NFS; 2, NFS is configured, when configuring nfs server, in order to file management is convenient, can create a roofnfs catalogue under current directory, amendment rootnfs authority, enters system with root identity, amendment configuration NFS configuration file, and last column adds in exports file:
/home/media/rootnfs*(rw,sync,no_root_squash)
Then upgrade and check that whether configuration file is wrong.3, NFS is restarted.
The installation of cross compile chain
After the configuration of host linux system is complete, download arm-linux-gcc.tar.gz, compiling is installed.Step is as follows: 1) from the Ubuntu system home catalogue of file copy arm-linux-gcc.tar.gz to PC host, and carry out decompress(ion): 2) editing environment variable, vi is used to open/etc/bashrc file, a line is added: 3) newly open a terminal after it, input arm-linux-gcc – v, if there is information, successful installation is described.
As shown in Figure 1, described U-boot transplants and comprises: first stage first hardware device initialization, comprises system reset, arranges CPU mode of operation, shields all interruptions, carries out initialization to Memory Controller Hub and serial ports, arranges clock frequency, closes cpu instruction and data Cache etc.; Arrangement is reorientated to code, open up certain arbitrary access space be second stage bootloader load prepare, then the code of second stage is loaded into ram space; The storehouse jumping to second stage code entrance is set;
Second stage carries out bootloader loading, first initiating hardware equipment, then maps Installed System Memory; Load kernel and root file system, the start-up parameter of kernel is set; Finally start kernel.
Bootloader, all from the flash memory that band plate carries, is kept at the inside by a lot of development board, and vkboard development board does not carry any plate and carries flash memory, but by Bootloader from MMC(SD card) the code of reading second stage.The first stage of Bootloader starts to start from power on, that TI claims this one-phase is BootROM, the bootloader initialization CPU in this stage and hardware device, then access first subregion (FAT file format) of SD card, downloads the file of suffix " MLO " by name and perform.The second stage of Bootloader is the one of x-loader or spl, and bootloader is also first subregion of access SD card at this one-phase, and download file " u-boot.bin " also performs.Namely the three phases of Bootloader is U-boot, is a kind of bootloader that can be used for a variety of embedded board.U-boot has many advantages, comprises and carries interactive shell, variable, can access SD card and show its content; By simple configuration, U-boot can find the file " uImage " at SD card first subregion with root identity and perform, i.e. linux kernel file.
Described vkboard development board is transplanted the step of U-boot:
1) first decompress(ion) uboot source code:
2) at the u-boot-linaro-stale file that current directory will generate, enter into this catalogue, perform compilation process;
3) before make compiling, a lower platform is configured:
4) U-boot is compiled:
5) after having compiled, by the MLO file under u-boot-linaro-stale file and u-boot.img file transfer in SD card root file system, start up system, namely complete the transplanting of u-boot.
As shown in Figure 2, in described step B, linux kernel is transplanted, described linux kernel is divided into three layers: the system call interfaces on the device driver of the bottom, intermediate layer, upper strata, and modules in linux kernel carries out encapsulating and provides the unified interface function of access bottom for upper strata by described system call interfaces; The step that linux kernel is transplanted is as follows:
1) the kernel version linux-3.2 of vkboard, is downloaded;
2), enter into/kernel-omap4 catalogue under;
3), revise Makefile, under kernel catalogue, specify cross-compiler and make an amendment, and in system environment variable PATH, adding the absolute path of kernel;
4), from config.kern, optional configuration file is introduced;
5), transplantable kernel file is generated;
6), uImage is transferred to development board;
7), Reboot, can writing system be started, Kernel Porting success.
The framework of described linux kernel comprises management of process, memory management, Virtual File System, network interface layer, interprocess communication, and each several part has cooperated the function of whole kernel mutually.
Make the root file system being used for EMMC and starting in described step C, add emmc equipment at platform associative directory, make kernel can identify emmc equipment; Upper root file system is made of emmc comprises the following steps: after SD card start-up, order fdisk – l, just can identify mmcblk0 (SD card), mmcblk1 (emmc). partition format is carried out to mmcblk1, first copy in emmc with MLO, U-boot, uImage of generating before dd order, but skip 512 bytes that emmc starts, then be mmcblklp1 to emmc subregion behind this section of space, be then formatted as ext4; Finally under the mmcblk0p2 of sd card (rootfs file system) carry/tmp/sdrootfs catalogue, emmc equipment mmcblk1p1 also carry out/tmp/mmcrootfs, then perform copy command, finally make an emmc image file.
As shown in Figure 3, a kind of system of the video frequency monitoring method based on built-in Linux, comprising:
Real Time Video Capture Module: utilize V4L2 driver framework to gather original video data, and data message is passed to Video Coding module by effective mode;
Coding module: the coded format of specifying by user, encodes to the original video data collected, and uses herein and H.264 encodes, and the data after coding are write into frame buffer administration module;
Embedded video server module: read frame data from frame buffer administration module, and its form of being wrapped with RTP by streaming technology is sent to client, client player is carried out decoding and is play; Embedded video server module comprises RTP packet encapsulation module, data packet compressing coding module, data packet transmission module;
Video transmission module: utilize streaming media transmission technique, realize the video image information that collects can in real time, high definition, to transmit fast;
Above-mentioned four functional modules all realized with the form of one or more thread in coding stage, operating system needs the execution of simultaneously dispatching multiple thread, often need between each functional module to communicate simultaneously, therefore need the inter-process communication mechanisms utilizing built-in Linux operating system to provide to carry out management of process scheduling.
As shown in Figure 4, the workflow of Real Time Video Capture Module is as follows:
1) collecting device of specifying is opened;
2) can judgment device support video acquisition function;
3) video acquisition form is set;
4) internal memory of store data is distributed;
5) information of buffer memory is passed through the space of memory-mapped mode to user;
6) start to gather video;
7) the caching frame data gathered are taken out;
8) by mmap map processed data cached joining the team fall in lines, realize circle collection;
9) collection of video is stopped;
10) video equipment is closed.
Based on H.264 carrying out fgs encoder module to the video image collected: directly realize H.264 encoding from IO control command, the process of H.264 encoding is as follows:
1) open hardware encoding driving arrangement, use open function to realize, can judge whether to have opened successfully simultaneously; If can not successfully open, just exit;
2) address of decoder input buffer is obtained;
3) output buffer address pointer is returned equally;
4) V4L2 programming, read the data of camera collection and be directly passed to MFC input buffering, H.264 encode to it, the data after coding are put in output buffer.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. based on a video frequency monitoring method for built-in Linux, it is characterized in that, comprise the following steps:
A. embedded system development environment is built, build the environment of host and vkboard development board respectively, complete host service configuration comprise configuration nfs server and TFTP mode start linux kernel, set up the communication between host and vkboard development board, namely carry out building of cross compilation environment;
B. carry out the transplanting of embedded Linux system at vkboard development board, comprising: the transplanting of Bootloader U-boot, the transplanting of linux kernel on vkboard development board;
C. the root file system being used for EMMC and starting is made.
2. the video frequency monitoring method based on built-in Linux according to claim 1, it is characterized in that, in described steps A, TFTP mode starts linux kernel and comprises: host adopts the operating system of ubuntu12.04 version, a tftp server is set up in host ubuntu system, compiled uImage is put into ubuntu system, after vkboard development board starts, automatically by Network Capture uImage file, thus start up system.
3. the video frequency monitoring method based on built-in Linux according to claim 1, it is characterized in that, described U-boot transplants and comprises: first stage first hardware device initialization, comprises system reset, arranges CPU mode of operation, shields all interruptions, carries out initialization to Memory Controller Hub and serial ports, arranges clock frequency, closes cpu instruction and data Cache etc.; Arrangement is reorientated to code, open up certain arbitrary access space be second stage bootloader load prepare, then the code of second stage is loaded into ram space; The storehouse jumping to second stage code entrance is set;
Second stage carries out bootloader loading, first initiating hardware equipment, then maps Installed System Memory; Load kernel and root file system, the start-up parameter of kernel is set; Finally start kernel.
4. the video frequency monitoring method based on built-in Linux according to claim 3, is characterized in that, described vkboard development board is transplanted the step of U-boot:
1) first decompress(ion) uboot source code:
2) at the u-boot-linaro-stale file that current directory will generate, enter into this catalogue, perform compilation process;
3) before make compiling, a lower platform is configured:
4) U-boot is compiled:
5) after having compiled, by the MLO file under u-boot-linaro-stale file and u-boot.img file transfer in SD card root file system, start up system.
5. the video frequency monitoring method based on built-in Linux according to claim 1, it is characterized in that, in described step B, linux kernel is transplanted, described linux kernel is divided into three layers: the system call interfaces on the device driver of the bottom, intermediate layer, upper strata, and modules in linux kernel carries out encapsulating and provides the unified interface function of access bottom for upper strata by described system call interfaces; The step that linux kernel is transplanted is as follows:
1) the kernel version of vkboard, is downloaded;
2), enter into/kernel-omap4 catalogue under;
3), revise Makefile, under kernel catalogue, specify cross-compiler and make an amendment, and in system environment variable PATH, adding the absolute path of kernel;
4), from config.kern, optional configuration file is introduced;
5), transplantable kernel file is generated;
6), uImage is transferred to development board;
7), Reboot, can writing system be started.
6. the video frequency monitoring method based on built-in Linux according to claim 5, it is characterized in that, the framework of described linux kernel comprises management of process, memory management, Virtual File System, network interface layer, interprocess communication, and each several part has cooperated the function of whole kernel mutually.
7. the video frequency monitoring method based on built-in Linux according to claim 1, is characterized in that, makes the root file system being used for EMMC and starting, add emmc equipment, make kernel can identify emmc equipment at platform associative directory in described step C; Upper root file system is made of emmc comprises the following steps: after SD card start-up, order fdisk – l, just can identify mmcblk0 (SD card), mmcblk1 (emmc). partition format is carried out to mmcblk1, first copy in emmc with MLO, U-boot, uImage of generating before dd order, but skip 512 bytes that emmc starts, then be mmcblklp1 to emmc subregion behind this section of space, be then formatted as ext4; Finally under the mmcblk0p2 of sd card (rootfs file system) carry/tmp/sdrootfs catalogue, emmc equipment mmcblk1p1 also carry out/tmp/mmcrootfs, then perform copy command, finally make an emmc image file.
8. a system for the video frequency monitoring method based on built-in Linux as described in claim 1-7, comprising:
Real Time Video Capture Module: utilize V4L2 driver framework to gather original video data, and data message is passed to Video Coding module by effective mode;
Coding module: the coded format of specifying by user, encodes to the original video data collected, and uses herein and H.264 encodes, and the data after coding are write into frame buffer administration module;
Embedded video server module: read frame data from frame buffer administration module, and its form of being wrapped with RTP by streaming technology is sent to client, client player is carried out decoding and is play; Embedded video server module comprises RTP packet encapsulation module, data packet compressing coding module, data packet transmission module;
Video transmission module: utilize streaming media transmission technique, realize the video image information that collects can in real time, high definition, to transmit fast;
Above-mentioned four functional modules all realized with the form of one or more thread in coding stage, operating system needs the execution of simultaneously dispatching multiple thread, often need between each functional module to communicate simultaneously, therefore need the inter-process communication mechanisms utilizing built-in Linux operating system to provide to carry out management of process scheduling.
9. the system of the video frequency monitoring method based on built-in Linux according to claim 8, is characterized in that, the workflow of Real Time Video Capture Module is as follows:
1) collecting device of specifying is opened;
2) can judgment device support video acquisition function;
3) video acquisition form is set;
4) internal memory of store data is distributed;
5) information of buffer memory is passed through the space of memory-mapped mode to user;
6) start to gather video;
7) the caching frame data gathered are taken out;
8) by mmap map processed data cached joining the team fall in lines, realize circle collection;
9) collection of video is stopped;
10) video equipment is closed.
10. the system of the video frequency monitoring method based on built-in Linux according to claim 8, it is characterized in that, based on H.264 carrying out fgs encoder module to the video image collected: directly realize H.264 encoding from IO control command, the process of H.264 encoding is as follows:
1) open hardware encoding driving arrangement, use open function to realize, can judge whether to have opened successfully simultaneously; If can not successfully open, just exit;
2) address of decoder input buffer is obtained;
3) output buffer address pointer is returned equally;
4) V4L2 programming, read the data of camera collection and be directly passed to MFC input buffering, H.264 encode to it, the data after coding are put in output buffer.
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