CN101534423A - Network video server based on embedded platform - Google Patents
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Abstract
The invention relates to a network video server based on an embedded platform. The server comprises a video data acquisition and coding/decoding unit, a video data compression and decompression unit, a video data storage unit, a network unit, a control unit and a power supply unit; an input interface of a video data coding module is connected with a camera, and an output interface of the video data coding module is connected with an input interface of a video data compression/decompression module; an input interface of a video decoding module is connected with an output of the video data compression and decompression unit, and an output of the video decoding module is connected with a liquid crystal screen; an output interface of the compression/decompression module is connected with an input of the decoding module; and the network unit is connected with the control unit through bus expansion. The system has the advantages of quick processing, interference resistance, convenience for searching and recording, clear video image, display of multipath images by a single machine, and the like; and an IP network combines a monitoring center with a monitoring target in any place where the network reaches into a system so as to adapt to the remote, real-time and integrated requirements of the video monitoring system at present.
Description
Technical field
The invention belongs to the monitoring remote video field, particularly a kind of network remote video monitoring system based on embedded platform.
Background technology
High speed development along with computer technology, digital technology is used for video monitoring system more and more, greatly improved the performance of system, making supervision, multi-functional automatic warning, multimedia data retrieval, many pictures high definition show becomes a reality, promoted its range of application widely, function is constantly increasing, and cost is also constantly reducing.Therefore, digitlization, networking, the intelligent a kind of development trend that has become field of video monitoring, digital video monitor system also progressively enters the large-scale commercial applications application stage.
In the process that digitizing technique constantly develops, new video compression standard is constantly released.Mpeg standard is a kind of dynamic image encoding method that is used for stored digital, transmission of being formulated by Motion Picture Experts Group, because this compression standard combines multiple compress technique, therefore have characteristics such as applicability is strong, compression ratio is high, picture quality is good, be widely used in the video monitoring system.MPEG-4 is after MPEG-1 and MPEG-2, another ISO/IEC standard, i.e. ISO/IEC14496 of formulation.It can obtain higher audio/video compression ratio, has content-based interaction capabilities.Its core concept is to have adopted object-based modern method for encoding images, utilize human-eye visual characteristic, catch the essence of image information transmission, thinking from profile, texture, image reasonably is divided into object, background etc. then shape, texture and the motion of each object plane is encoded, thereby obtained to divide better quality, solution that code stream is littler than the tradition coding with the corresponding object plane of actual scene information.At present, the solution of compression of digital video mainly contains two kinds, and one is software scenario, and two is hardware plan.The former generally uses digital signal processor (DSP) or high performance flush bonding processor to realize, this design can lower design cost to a certain extent, but because the rational Application of the appropriate design of algorithm and system resource will make the whole open cycle increase.A kind of method in back realizes the encoding and decoding of MPEG-4 video standard for utilizing an exclusive decoding chip of MPEG-4, and this will effectively shorten the Products Development cycle, simultaneously owing to the exploitation of high-performance integrated chip, has greatly reduced the development cost of system.
Motion detection is a technology extremely with practical value in the video monitoring system, and timely warning and video recording are of great importance.Date technology application makes that carry out motion detection without auxiliary device (such as infrared acquisition) becomes possibility, and whether just can detect by the analysis to the video flowing of numeral has object of which movement also in time to report to the police and record a video in the pick-up lens.In the digitized video supervisory control system, generally the analog video signal of coming from camera is carried out digitlization, and be compressed into mpeg stream by video compression card.Carry out motion detection again if mpeg stream is de-compressed into the image of a frame one frame,, lose more than gain having very big operand; Therefore in this case, need utilize some particularity in mpeg encoded territory to carry out motion detection, make motion detection fast, efficiently.
In recent years, digital video monitor system has experienced development at full speed, late nineteen nineties up to the present, digital video monitor system can be divided into two kinds: a kind of is to utilize Computer Multimedia Technology to realize the digitlization remote monitoring and the storage of video, such system is a core with the all-purpose computer that inserts Internet, the video data acquiring card is housed thereon, camera collection is compressed to video data, store or send to remote monitoring terminal then by capture card.Another kind is to utilize embedded technology to realize the digital monitoring and the storage of video data, such system is called digitlization local video supervisory control system, it to realize functions such as compression of video data storage and local monitor, can not realize real-time remote monitoring only.Yet along with development of times, the remote trans-regional monitoring of simple and fast becomes pressing for of people, and first method need be at equipment such as the on-the-spot installation of monitoring all-purpose computers, and wiring is complicated, easy care not, seem very complicated and heavy, a kind of new conveniently totally digitilized Active Eyes is demanded people urgently and is gone research and realization.
Summary of the invention
Can only monitor the local video supervisory control system at existing embedded technology, problem that can not remote monitoring the invention provides a kind of network video server based on embedded platform.
Video monitoring system is made up of the network video server that is installed in the monitoring area and the remote monitoring terminal two parts that are built up in Surveillance center.Remote monitoring terminal comprises the computer that is connected on the Internet, switch etc., be mainly used in by its browser video server is conducted interviews, check immediately monitoring information or playback monitoring video for the previous period, and carry out operations such as fast forwarding and fast rewinding as required, and can send back the video file on the remote server on the computer of monitor terminal, preserve easily.
Described network video server comprises video data acquiring and codec unit, video data compression and decompress(ion) unit, video data memory cell, network element, control unit and power supply unit.Wherein the video data codec unit is by the CCD camera, video encoding module and video decode module are formed, the input interface of video data encoding module links to each other with camera, output interface links to each other with the input interface of video data compression/decompression module, main be responsible for to camera collection to analog video data carry out mould/number conversion, the input interface of video decode module is connected with the output of video compression/decompress(ion) unit, the output of video decode module links to each other with liquid crystal display screen, main being responsible for carried out D/A switch to the video data behind the decompress(ion), thereby realizes local playback; Described video compression and decompress(ion) unit mainly comprise video compression/decompression module and its peripheral circuit, through the digitlization of video data encoding module video data be input to the video input interface of video compression/decompression module, the output interface of compression/decompression module is connected with the input of decoder module; Described network element links to each other with control unit by the mode of bus expansion; Described video data memory cell extends out the SD card by the external portable hard drive of usb host interface, USB flash disk or SD/MMC interface and realizes; Described power supply unit is to other plurality of units power supplies; Described control unit is a core with the embedded microprocessor, utilizes 32 bus expansion FLASH, and SDRAM controls and read compressing video frequency flow by the external host interface of video compression/decoder chips to this chip, utilizes I
2C bus interface control coding chip and decoding chip.
The communication means at video server and monitoring center has adopted the architecture of client/server, server end is a network video server, client is the monitoring center, network video server carries out data communication by inserting Internet or local area network (LAN) and monitoring center, employing be ICP/IP protocol.Video encoding module is carried out mould/number conversion to the analog video signal that camera collection comes, and obtains digital video signal, and then by video/Compress softwares module digital video signal is compressed, and obtains the video data stream of mpeg format.The user only need import the IP address of this server in the PC browser, log on the homepage of this video server, carries out authentication, just can finish corresponding operation after downloading and installing ActiveX control.If the user need carry out remote monitoring by network, then the video data of the mpeg format that obtains through overcompression fails to be convened for lack of a quorum and sends to the client with the Streaming Media form by network.If the user needs local storage, then this video data fails to be convened for lack of a quorum under the control of control unit, stores among the memory cell that extends out by USB interface.Native system also has the function of local monitor, if the user need carry out local playback to the surveillance video of this locality storage, control unit then can read the video data in the USB outer extension memory, and then to its operation of carrying out decompress(ion), decoding, finally shows on liquid crystal display screen.
The video data encoding resume module of network video server be the NTSC/PAL/SECAM format video signal that camera collection arrives, produce the digital video signal meet video compression/decompress(ion) unit video interface standard.Externally under the control of host CPU, this digital of digital video data carries out the hardware-compressed coding by the compression/decompression chip, the encoded data stream that produces is by the integrated Mux fifo interface output of chip internal, under the control of control unit, it is carried out USB storage handles, the processed video data can be stored on the physical medium, so that carry out playback by keyboard operation when needed.The decompression coding of network video server is the inverse process of compressed encoding, and the data flow that needs decompress(ion) is by the inner integrated DemuxFIFO interface input of video compression decoder chips, and the decompression cataloged procedure is the inverse process of compressed encoding.Several important peripheral hardware in the native system all is to be connected with processor by the mode that bus is expanded.Wherein read-write control signal is that each peripheral hardware is shared, in order to guarantee can not produce the phase mutual interference between them, different signal carries should be selected port at the different sheet of processor.
The data codec unit of network video server is an interface circuit between baseband analog video signal and the video compression/decompress(ion) unit, it comprises a video coding chip and a video decoding chip, main mould/number and the D/A switch of being responsible for video data, and the conversion of format digital video signal.
The video data compression of network video server/decompress(ion) unit is to be core with video compression/decoder chips, this chip is connected with control unit by its host interface, and this chip also needs outer expansion capacity, high speed SDRAM to come the pending video stream of buffer memory simultaneously.
The video data memory cell of network video server realizes that by the USB outer extension memory along with the appearance of big capacity USB memory device, more users all are ready to select this mode.
The network element of network video server is to be core with the network chip, and control unit is controlled network chip by address, data, control line and chip selection signal line and communicated by letter.
The control unit of network video server is to be core with the embedded microprocessor, by bus expansion SDRAM, NAND FLASH, and pass through I
2C bus control of video coding and decoding unit.
The power supply unit of network video server has adopted the voltage stabilizing linear power supply, by the 12V DC power supply of outside input, through the DC voltage-stabilizing chip, drops to 5V, 3.3V and 1.8V respectively, and the different piece of supply circuit is used.
The operation principle of network video server is as follows: video encoding module is carried out mould/number conversion to the analog video signal that camera collection comes, obtain digital video signal, and then by video/Compress softwares module digital video signal is compressed, obtain the video data stream of mpeg format.The user only need import the IP address of this server in the PC browser, log on the homepage of this video server, carries out authentication, just can finish corresponding operation after downloading and installing ActiveX control.If the user need carry out remote monitoring by network, then the video data of the mpeg format that obtains through overcompression fails to be convened for lack of a quorum and sends to the client with the Streaming Media form by network, shows on client's browser page.If the user needs local storage, then this video data fails to be convened for lack of a quorum under the control of control unit, stores among the memory cell that extends out by USB interface, names each video file according to the time.Native system also has the function of local monitor, if the user need carry out local playback to the surveillance video of this locality storage, control unit then can read the video data in the USB outer extension memory, and then it is carried out the operation of decompress(ion), decoding, finally on liquid crystal display screen, show, and can carry out as operations such as F.F., rewind downs.
The software section of network video server mainly operates in the embedded microprocessor in the control unit, mainly is made up of specifically 7 functional modules to be described below:
(1) control module of network video server: the control module of network video server is responsible for controlling each module of this server: to video frequency processing chip configuration, accept video stream data and utilize the USB memory device to store, configuring network interface is set up perfect network function simultaneously.Bring into operation from start, follow these steps to carry out each module, up to its execution of shutdown.
Step 1: start powers on, and the operational system initialization module carries out the parameter configuration to each module;
Step 2: move local graphical interfaces module;
Whether step 3: detecting USB flash disk has memory space;
Step 4:, then forward step 9 to if USB flash disk does not have memory space;
Step 5:, then enter local memory module if USB flash disk has capacity;
Whether step 6: detecting networking client has connection request;
Step 7: if not request of remote client then forwards step 5 to;
Step 8: if the remote client has request, then send packet, carry out the demonstration of real-time video to the client;
Step 9: system deletes the video data of previous time period in the USB flash disk automatically, forwards step 3 to.
(2) the video record module of network video server: the video record module of network video server mainly is responsible for being converted into the MPEG-4 video mode from the analog signal of camera collection.
Step 1: system's operation that powers on;
Step 2: system finishes the configuration to the audio frequency and video process chip;
Step 3: system finishes the configuration to the analog-to-digital conversion chip;
Step 4: the detection of stored space module of carrying out local memory module;
Step 5: detect no space, deletion video information the earliest forwards step 4 to;
Step 6: detected memory space, vision signal is handled, by the internal interface of audio frequency and video process chip, be transferred to local storage area and store then.
(3) the local memory module of network video server: the local memory module of network video server mainly is responsible for the video data of the mpeg format behind the coding is stored, and carries out local playback and telecommunication network playback for the client.From the start operation, follow these steps to fill order.
Step 1: detect the USB flash disk memory space, and this information is presented on the demonstration aspect;
Step 2:U dish has memory space, then stores with system time named file name, makes things convenient for the user to search the playback video file with time sequencing;
Step 3:U coils no memory space, and then the video file recorded the earliest of the automatic deletion of system forwards step 2 to;
Step 4: remote client or native client have the playback demand, call storage file and send to the client;
Whether step 5: detecting has the end storage signal;
Step 6: detected end signal, stopped storage;
Step 7: do not detect end signal, continue storage, forward step 5 to.
(4) the candid photograph functional module of network video server: the function that network video server provides the user to capture image, utilize video frequency processing chip with the JPEG encoding function realize.Picture is to preserve with the JPEG coding form, equally when preserving with the system time name and behind filename, add ' P ', be like this for when the playback and video file distinguish.Realization flow and video coding flow process basically identical that picture is captured, difference is coding mode is configured to jpeg mode.According to the following step fill order.
Step 1: long-distance user and local user ask to capture image;
Step 2: the JEPG encoding function of video coding chip is opened by system;
Step 3: whether detection system has memory space;
Step 4: system has living space, and deposits in or display image;
Step 5: system does not have the space, and call function deletion video file the earliest forwards step 4 to;
(5) the video playback module of network video server: the playback module of network video server is watched video data and image setting in the past for long-range or local user, in order to realize better interactive capability, under the video decode playback menu, mainly finish following function, in the demonstration and video file decoding and displaying of progress bar, increase time-out, F.F. and rewind down function when the demonstration of USB flash disk file, the selection of video file, broadcast.The user can operate by calling local video data stored.Carry out the following steps operation:
Step 1: long-distance user and local user ask video playback;
Step 2: the decoding function of audio frequency and video process chip is opened by system;
Step 3: call video data from local memory module, send to requesting client.
Step 4: detect the user and whether stop playback;
Step 5: do not have stop signal, continue execution in step 3;
Step 6: detect stop signal, close the decoding function of audio frequency and video process chip;
Step 7: continue to carry out the function that shows real time video data.
(6) remote monitoring module of network video server: the remote monitoring module of network video server is responsible for carrying out remote client's various requests, the IP address of fan-in network video server in the IE of monitor terminal browser, embedded network video server is according to request, show log-in interface, if user identity obtains confirming, then server can send to the user with ActiveX control, after user's download is installed control, according to buttons different on the webpage, operate accordingly, submit to network video server then, the different information that network video server is submitted to according to the user, finish different operations, as connecting, disconnect, playback, F.F., rewind down etc., concrete steps are as follows:
Step 1: the IP address of long-distance user's input video server, Connection Service device;
Step 2: server response long-distance user's connected reference shows log-in interface;
Step 3: the long-distance user lands;
Step 4: if long-distance user's status incongruence, then denied access request;
Step 5: by authentication, then server transmission ActiveX control downloads and installs for the long-distance user as if the long-distance user;
Step 6: the client downloads and ActiveX control is installed, and begins to carry out various remote operations, carries out remote real-time monitoring.
(7) motion detection block of network video server: the motion detection block of network video server is come the storage and the actuation of an alarm of control of video data by motion detection.Begin not have the motion alarm signal, memory module is in wait state; The motion alarm signal arrives, and starts memory module, if do not continue within a certain period of time to receive the motion alarm signal, memory module quits work automatically.Memory space is than the much less of depositing continuously like this, and a large amount of nonmotile videos are cut have been cut out, and has improved deposit efficient greatly, has saved memory space effectively, has improved the service efficiency of video monitoring system.The specific implementation step is as follows:
Step 1: server is at first set surveyed area, the parameter of configuration-system;
Step 2: system will carry out video compression from the video letter that camera acquisition comes, and the code stream of compression outputs in the buffering area;
Step 3: whether system detects has moving object to enter the zone of prior setting;
Step 4: system does not detect moving object, and the moving condition of promptly on-the-spot desire does not satisfy the condition of sending alarm signal, forwards step 2 to;
Step 5: when system had detected moving object and enters this zone, promptly on-the-spot moving condition satisfied the condition of sending alarm signal, and opens recording function automatically.
Network video server among the present invention mainly has following 6 functions:
1, multimachine networking function
This video server networking mode is flexible, can support wireless network card connection AP (Aceess Point) or form local area network (LAN) by Ethenet, also can insert Internet, realizes trans-regional remote monitoring; After adopting this video server, network comprehensive lining has replaced traditional numerous and jumbled analog video wiring, the web camera plug and play, and engineering construction is simplified greatly.
2, various video compressed format can be selected for the user
This video server video image format is various, and the user can select according to different demands, and the encoding and decoding agreement of support has MPEG-1, MPEG-2, and MPEG-4, H.263, five kinds of M-JPEG;
3, local function variation
This video server has local decompression playback function, and the selection of local playback video is provided to the user; This video server can pass through USB port, connects memory devices such as portable hard drive, and local mass storage function is provided, and for satisfying some specific demand, provides the flexibility ratio of MAXIMUM SELECTION;
4, anti-theft alarm function
This video server has monitoring moving image warning function, promptly can be configured to the function that has image motion to report to the police in the zone of monitoring; Can be used for bank, museum etc. has the place of specific (special) requirements to safety.
5, support the multi-user to insert
This video server can support 20 users to visit this embedded server simultaneously at most, and is easy to use, can monitor same place in different places.
6, network transmission protocol variation
This video server can be supported connection-oriented Transmission Control Protocol and connectionless udp protocol simultaneously in network layer, if this video server only uses in local area network (LAN), the user can select reliable connection-oriented Transmission Control Protocol; If this video server is to be used among the Internet, in order to guarantee transmission speed, the user can select connectionless udp protocol.
System sends enabling signal to memory device, and memory device is all preserved the compressed bit stream of buffering area once receiving enabling signal, and follows the code stream of continuous store video compression output, till storage control indication stops deposit.System reports to the police simultaneously, to reach the effect of caution moving object.
The physics formation of the supervisory control system that this network video server is formed comprises: one or more video servers, wired or wireless monitor terminal, switch, router, alarm.Annexation is: video server links to each other with monitor terminal by equipment such as netting twine or switches, and video server links to each other with alarm.
This supervisory control system major function is: web camera not only can be used for area monitoring based on LAN (Local Area Network), monitors traditionally as residential quarters monitoring, office building, bank, market etc.; And can be used for trans-regional novelly remote monitoring and online the displaying by Internet, perform in a radio or TV programme on the net long-range children and old man's nurse, unattended communication's center monitoring, tourist attractions, product internet exhibition etc.
The present invention has following advantage compared with the prior art: this system adopts USB memory device, stores video data, and cost is low, capacity is big.This system has fast throughput, digital information antijamming capability, be convenient to the quick search record, video image is clear and unit shows advantages such as multiway images, and support network, really brought into play the advantage of broadband network, pass through IP network, the monitoring objective Anywhere that can arrive Surveillance center and network is combined into a system, has really adapted to demand long-range, real-time to video monitoring system at present, that concentrate.
Description of drawings
The network video monitor and control system structured flowchart of Fig. 1 for constituting by the present invention,
Fig. 2 forms structure chart for video server hardware of the present invention,
Fig. 3 forms structure chart for video server software of the present invention,
Fig. 4 is the software hierarchy chart of video server of the present invention,
Fig. 5 is one embodiment of the invention power module 5V, the detailed circuit schematic diagram of 3A output,
Fig. 6 is one embodiment of the invention power module 1.8V, the detailed circuit schematic diagram of 1A output,
Fig. 7 is one embodiment of the invention power module 3.3V, the detailed circuit schematic diagram of 1.5A output,
Fig. 8 is the video encoding module circuit theory diagrams of one embodiment of the invention video server,
Fig. 9 is the video decode modular circuit schematic diagram of one embodiment of the invention video server,
Figure 10 is the Network Interface Module circuit theory diagrams of one embodiment of the invention video server,
Figure 11 is the circuit theory diagrams of the master control module of one embodiment of the invention video server,
Figure 12 is the video data compression and the decompression module circuit theory diagrams of one embodiment of the invention video server,
Figure 13 is the reset circuit modular circuit schematic diagram of one embodiment of the invention video server,
Figure 14 is the crystal oscillating circuit figure of one embodiment of the invention video server,
Figure 15 is an one embodiment of the invention video server audio frequency and video processing module system clock circuit schematic diagram,
Figure 16 is buffered memory module FLASH (1) circuit theory diagrams of one embodiment of the invention video server,
Figure 17 is buffered memory module FLASH (2) circuit theory diagrams of one embodiment of the invention video server,
Figure 18 is the buffered memory module SDRAM circuit theory diagrams of one embodiment of the invention video server,
Figure 19 is the USB circuit theory diagrams of the local memory module of one embodiment of the invention video server,
Figure 20 is the video coding flowchart of video server of the present invention,
Figure 21 is the video decode flowchart of video server of the present invention,
Figure 22 is the Bootloader boot flow figure of video server of the present invention,
Figure 23 captures the coding flowchart for the image of video server of the present invention,
Figure 24 is the overall flowchart of local application software of video server of the present invention,
Figure 25 is the motion monitoring flowchart of video server of the present invention,
Figure 26 is the detailed flowchart of video server Local Control Module software of the present invention,
Figure 27 uses flowchart for the remote monitoring of video server of the present invention,
The network control module block diagram of Figure 28 video server of the present invention.
Embodiment
The video monitoring system that is made of the network video server that the present invention is based on embedded platform as shown in Figure 1, the communication means at video server and monitoring center has adopted the architecture of client/server, server end is a network video server, client is the monitoring center, the monitoring center comprises by wired or wireless network and is connected computer on the Internet, switch etc., network video server carries out data communication by the monitor terminal that inserts Internet or local area network (LAN) and monitoring center, and the agreement of employing is an ICP/IP protocol.
The hardware of network video server constitutes as shown in Figure 2, that control unit wherein adopts is the embedded microprocessor S3C2410 of the ARM9 core of Korea S Samsung production, utilize 32 bus expansion FLASH, SDRAM, compressing video frequency flow is controlled and read to external host interface by video compression/decoder chips to this chip, utilizes I
2C bus interface control coding chip and decoding chip, the several important peripheral hardware in the present networks video server all are to be connected with processor by the mode that bus is expanded.Wherein read-write control signal is that each peripheral hardware is shared, in order to guarantee can not produce the phase mutual interference between them, different signal carries should be selected port at the different sheet of processor, and its interface circuit as shown in figure 11.Fig. 8 has shown the circuit theory diagrams of S3C2410 chip peripheral circuit to Figure 18.The power supply unit of network video server plays crucial effects to the steady operation of this system.Owing to used modulus/analog-digital chip in the present networks video server, for making the more effective work of its energy, avoid the interference of high frequency ripple, use linear power supply module in the present networks video server, MIC4576-5.0, MIC29150-3.3, MIC39150-1.8.Consider the power consumption of AT2042 chip, can stable for a long time work for making it, all power supply chips are all selected TO-220 envelope shape for use, but radiation fin behind each power supply chip like this can guarantee its long-time effectively work.That the video data encoding module of network video server adopts is the super low-power consumption picture decoding chip TVP5150 of TI company, as shown in Figure 8, it is handled to be the NTSC/PAL/SECAM format video signal that camera collection arrives, and produces the digital video signal that meets video compression/decompress(ion) unit video interface standard.The compression that network video server adopted, decoder chips are the AT2042 chip that Korea S Pentamicro company produces, its circuit as shown in figure 12, above-mentioned digital of digital video data carries out the hardware-compressed coding by the compression/decompression chip by AT2042, the encoded data stream that produces is by the integrated Mux fifo interface output of chip internal, under the control of control unit, it is carried out USB storage handles, the processed video data can be stored on the physical medium, so that carry out playback by keyboard operation when needed.The decompression coding of network video server is the inverse process of compressed encoding, and the data flow that needs decompress(ion) is by the inner integrated Demux fifo interface input of video compression decoder chips, and the basic principle of the coding that decompresses is similar to compressed encoding.The video data decoding module of network video server is selected SAA7121 for use, it is the television signal coding chip of a special use, the digital signal of input can be converted into the anolog TV signals that are suitable for transmitting through inner D/A, can fit output signal by the configuration relevant register and satisfy S-video interface or multiplex interface.
The network element of network video server is a core with network interface chip LAN91C111, its interface circuit as shown in figure 10, master control chip S3C2410 controls the LAN91C11 network chip by address, data, control line and chip selection signal line and communicates by letter.At first put the transmission enable signal when master chip sends signal, data send signal end TXD0～TXD1 and are connected with TXD0～TXD1 pin of LAN91C11, as the sendaisle of the data clock signal TCK transmission data with S3C2410.The corresponding connection of RXD0～RXD1 pin of data receiver RXD0～RXD1 and LAN91C11 is the Data Receiving passage.LAN91C11 comes gating by S3C2410 gating signal line AEN, by the setting to a series of registers of LAN91C11, can realize the Network Transmission of video flowing.The INTRQ0 end of LAN91C11 is used for producing interrupt signal.Ethernet control chip carries out the transmission of data by the DMA passage.At first set the parameter of transmission control and transport address register, from data designated storage area reading of data, send in the inner transmission buffer successively, data are encapsulated transmission with MAC, and writing down the byte number that has sent simultaneously, whole data block sends and finishes by the time.After one group of data sent, request DMA interrupted, and is handled by S3C2410.
First program of carrying out when Bootloader is system start-up is mainly finished the initialization to hardware system.Specifically comprise: the initialization of S3C2410, TVP5150 functional configuration, SAA7121 functional configuration, loading AT2042 firmware, Ethernet and serial ports initialization.Owing to when start, will show start-up picture, so except that the corresponding hardware resource of initialization in Bootloader, also the image data of start-up picture should be sent among the AT2042 SDRAM.Its workflow shows start-up picture as shown in figure 22, and mainly the JPEG decoding function by AT2042 realizes.At first dispose the JPEG decoding function of AT2042, will add in the program with the form of header file earlier by display image, when needs show, again view data is sent to AT2042.
It is to preserve with the JPEG coding form that picture is captured the picture that function captures, and names with system time when preserving equally and add ' P ' behind filename, be like this for when the playback and video file distinguish.As shown in figure 23, realization flow and video coding flow process basically identical that picture is captured, difference is coding mode is configured to jpeg mode.
The video coding function mainly utilizes AT2042 to realize.At first, configuration respective coding register, for example coding mode, encoded pixels point, the frame per second of encoding and encoding stream form (PES, PS, TS) or the like is set.Adopt MPEG-4 pattern, 720X576, per second 25 frames in the native system and generate PES stream to come to coding video data.Its flow chart as shown in figure 20.
The video decode playback function is the inverse process of video coding memory function, all realizes by AT2042.At first, the data of needs decoding are packed according to certain packet format, by main frame these data are sent to decoding multiplexing (DemuxFIFO) formation then, this is the configuration decoding function, begins decoding.The idiographic flow of realizing as shown in figure 21.
Network control module is a mutual module of outside extension application and video server.The course of work of native system network control module: the IP address of fan-in network video server in the IE of monitor terminal browser, embedded network video server is according to request, with the control corresponding page is that ActiveX control feeds back to the IE browser, behind the user's download control, according to the instruction on the control, operate accordingly, submit to then, this module is extracted the information of operation, communicate by scoket socket and server according to different information and to handle events corresponding respectively, as the associative operation of regulating MPEG-4 association attributes, camera etc.The design of this network control module mainly comprises three parts: the writing of the configuration of local embedded web server, ActiveX control, socket socket realize that server communicates by letter with monitoring client.Its principle as shown in figure 28
The control module of network video server is responsible for controlling the startup and the operation of this network video server, and start brings into operation, and follows these steps to carry out each module, up to shutdown.It totally carries out flow process as shown in figure 24, and step is as follows:
Step 1: initialization system resource
Step 2: open the AT2042live function
Step 3: judged whether button operation
Step 4:, carry out its corresponding operating if having
Step 5:, continue to wait for if do not have
Step 6: judge whether and to log off
Step 7: not, continue to wait for
Step 6: be to log off
The execution flow process of the candid photograph functional module of network video server as shown in figure 23, concrete steps are as follows:
Step 1: long-distance user and local user ask to capture image;
Step 2: the JPEG encoding function of video coding chip is opened by system;
Step 3: whether detection system has memory space;
Step 4: there is memory space in system, deposits in or display image;
Step 5: system does not have memory space, and the video file that then automatic deletion is recorded the earliest forwards step 4 to;
The remote monitoring module of network video server is carried out flow process as shown in figure 27, and concrete execution in step is as follows:
Step 1: the IP address of long-distance user's input video server, Connection Service device;
Step 2: server response long-distance user's connected reference shows log-in interface;
Step 3: the long-distance user lands;
Step 4: if long-distance user's status incongruence, then denied access request;
Step 5: by authentication, then server transmission ActiveX control downloads and installs for the long-distance user as if the long-distance user;
Step 6: the client downloads and ActiveX control is installed, and begins to carry out various remote operations, carries out remote real-time monitoring.
The motion detection block of network video server is carried out flow process as shown in figure 25, and the specific implementation step is as follows:
Step 1: server is at first set surveyed area, the parameter of configuration-system;
Step 2: system will carry out video compression from the video letter that camera acquisition comes, and the code stream of compression outputs in the buffering area;
Step 3: whether system detects has moving object to enter the zone of prior setting;
Step 4: system does not detect moving object, and the moving condition of promptly on-the-spot desire does not satisfy the condition of sending alarm signal, jumps to step 2;
Step 5: when system had detected moving object and enters this zone, promptly on-the-spot moving condition satisfied the condition of sending alarm signal, and opens recording function automatically.
Use network video server of the present invention system, at first confirm to lead line, power supply, SD card etc. install correct after, can start network video server.After opening the localpower switch, show the welcome interface until liquid crystal display screen, system start-up finishes, the initialization of network function this moment finishes, the long-distance user can visit this server by network, the IP address of fan-in network video server in the IE of monitor terminal browser, embedded network video server is according to request, with the control corresponding page is that ActiveX control feeds back to the IE browser, after user's download is installed control, will demonstrate video playback window and [connection] on the user browser, [disconnection], [video recording], [playback], [candid photograph] five buttons, the user can operate as required accordingly.
Click [connection] button, client will be sent connection request to server end, treat that server end is connected with client after, the video playback window will show the immediately monitoring picture.In this state, click [video recording] or [candid photograph] button network video server and will record a video or capture operation, video file that obtains and picture file are kept in the local storage medium.Click [playback] button, will demonstrate the video file of in the network video server storage medium, storing on the video playback window, click the file of choosing, will the corresponding video file of playback on the video playback window.Click [disconnection] button, client will disconnect with server end.
In this locality, by any key, liquid crystal display screen will enter the choice menus interface, at this moment, will demonstrate five icons of [video recording] [local playback] [candid photograph] [local monitor] [shutdown system] on the interface when liquid crystal display screen is in the welcome interface.By [left] key or [to the right] key, select cursor to move on the icon in menu this moment on keyboard, selects corresponding operation by [determining] key.It carries out flow process as shown in figure 26.
On network video server choice menus interface, select recording function, video server will enter the video recording operating state, can show instant monitored picture on the liquid crystal display screen this moment, and the video data stream of the MPEG-4 form that network video server can produce AT2042 stores among the SD card.If space deficiency in the SD card, then system will delete video file the earliest automatically, continues storage then.Under the video recording operating state,, can get back to the choice menus interface by [withdrawing from] key.
On network video server choice menus interface, select to capture picture function, video server will enter picture and capture operating state, at this moment, liquid crystal display screen can show instant video monitoring picture, and by [candid photograph] key, network video server will be captured operation to monitored picture timely, the picture file that candid photograph obtains will be stored in the SD card, at this moment, by [withdrawing from] key, will get back to the choice menus display interface.
On network video server choice menus interface, select video playback functionality, network video server will enter the video playback state, can show the video file that has existed at present on the liquid crystal display screen, the user can be by selecting by [making progress] key or [downwards] key moving cursor, treat that cursor moves on the file of choosing, by [determining] key, system will play this video file, and this is can see broadcasting pictures on liquid crystal display screen.The user can use [left] key or [to the right] key, regulates the playing progress rate of video, realizes F.F. or rewind down.By [withdrawing from] key, network video server will withdraw from the video playback state, get back to the choice menus interface.
On network video server choice menus interface, select the local monitor function, will show instant monitor video image on the liquid crystal display screen, the design has added the capturing movement function here, can be used for realizing reporting to the police, if guarded region has object of which movement, network video server will provide alarm signal.If the user needs, the present networks video server can also add warning function under video state.
Claims (11)
1, a kind of network video server based on embedded platform, it is characterized in that this server comprises video data acquiring and codec unit, video data compression and decompress(ion) unit, the video data memory cell, network element, control unit and power supply unit, wherein the video data codec unit is made up of CCD camera video coding module and video decode module, the input interface of video data encoding module links to each other with camera, output interface links to each other with the input interface of video data compression/decompression module, main be responsible for to camera collection to analog video data carry out mould/number conversion, the input interface of video decode module is connected with the output of video compression/decompress(ion) unit, the output of video decode module links to each other with liquid crystal display screen, main being responsible for carried out D/A switch to the video data behind the decompress(ion), thereby realizes local playback; Described video compression and decompress(ion) unit mainly comprise video compression/decompression module and its peripheral circuit, through the digitlization of video data encoding module video data be input to the video input interface of video compression/decompression module, the output interface of compression/decompression module is connected with the input of decoder module; Described network element links to each other with control unit by the mode of bus expansion; Described video data memory cell extends out the SD card by the external portable hard drive of usb host interface, USB flash disk or SD/MMC interface and realizes; Described power supply unit is to other plurality of units power supplies; Described control unit is a core with the embedded microprocessor, utilizes 32 bus expansion FLASH, and SDRAM controls and read compressing video frequency flow by the external host interface of video compression/decoder chips to this chip, utilizes I
2C bus interface control coding chip and decoding chip.
2, the network video server based on embedded platform according to claim 1, the data codec unit that it is characterized in that described network video server is an interface circuit between baseband analog video signal and the video compression/decompress(ion) unit, it comprises a video coding chip and a video decoding chip, main mould/number and the D/A switch of being responsible for video data, and the conversion of format digital video signal.
3, the network video server based on embedded platform according to claim 1, video data compression/decompress(ion) the unit that it is characterized in that described network video server is to be core with video compression/decoder chips, this chip is connected with control unit by its host interface, and this chip also needs outer expansion capacity, high speed SDRAM to come the pending video stream of buffer memory simultaneously.
4, the network video server based on embedded platform according to claim 1, the control unit that it is characterized in that described network video server are that core comprises with lower module with the microprocessor: control module, video record module, local memory module, candid photograph functional module, video playback module, remote monitoring module and motion detection block.
5, according to claims 4 described network video servers based on embedded platform, it is characterized in that described control module is responsible for controlling each module of this server: to the configuration of video frequency processing chip, accept video stream data and utilize the USB memory device to store, configuring network interface is set up perfect network function simultaneously, bring into operation from start, follow these steps to control each module:
Step 1: start powers on, and the operational system initialization module carries out the parameter configuration to each module;
Step 2: move local graphical interfaces module;
Whether step 3: detecting USB flash disk has memory space;
Step 4:, then forward step 9 to if USB flash disk does not have memory space;
Step 5:, then enter local memory module if USB flash disk has capacity;
Whether step 6: detecting networking client has connection request;
Step 7: if not request of remote client then forwards step 5 to;
Step 8: if the remote client has request, then send packet, carry out the demonstration of real-time video to the client;
Step 9: system deletes the video data of previous time period in the USB flash disk automatically, forwards step 3 to.
6,, it is characterized in that the responsible analog signal from camera collection of described video record module is converted into the MPEG video mode, comprises the steps: according to claims 4 described network video servers based on embedded platform
Step 1: system's operation that powers on;
Step 2: system finishes the configuration to the audio frequency and video process chip;
Step 3: system finishes the configuration to the analog-to-digital conversion chip;
Step 4: the detection of stored space module of carrying out local memory module;
Step 5: detect no space, deletion video information the earliest forwards step 4 to;
Step 6: detected memory space, vision signal is handled, by the internal interface of audio frequency and video process chip, be transferred to local storage area and store then.
7, according to claims 4 described network video servers based on embedded platform, it is characterized in that described local memory module is responsible for the video data of the mpeg format behind the coding is stored, carry out local playback and telecommunication network playback for the client, from the start operation, follow these steps to carry out:
Step 1: detect the USB flash disk memory space, and this information is presented on the demonstration aspect;
Step 2:U dish has memory space, then stores with system time named file name, makes things convenient for the user to search the playback video file with time sequencing;
Step 3:U coils no memory space, and then the video file recorded the earliest of the automatic deletion of system forwards step 2 to;
Step 4: remote client or native client have the playback demand, call storage file and send to the client;
Whether step 5: detecting has the end storage signal;
Step 6: detected end signal, stopped storage;
Step 7: do not detect end signal, continue storage, forward step 5 to.
8, according to claims 4 described network video servers based on embedded platform, it is characterized in that described candid photograph functional module, be to provide the function of capturing image for the user, utilize video frequency processing chip with the JPEG encoding function realize, picture is to preserve with the JPEG coding form, equally when preserving with the system time name and behind filename, add ' P ', be like this for when the playback and video file distinguish, picture is captured functional module, carries out according to the following step:
Step 1: long-distance user and local user ask to capture image;
Step 2: the JPEG encoding function of video coding chip is opened by system;
Step 3: whether detection system has memory space;
Step 4: system has living space, and deposits in and display image;
Step 5: system does not have the space, and the video file that then automatic deletion is recorded the earliest forwards step 4 to;
Step 6; Continue to show real time video data.
9, according to claims 4 described network video servers based on embedded platform, it is characterized in that described video playback module for long-range or local user watch before video data and image setting, in order to realize better interactive capability, under the video decode playback menu, mainly finish following function, the demonstration of USB flash disk file, the selection of video file, during broadcast in the demonstration of progress bar and the video file decoding and displaying, institute increases time-out, F.F. and rewind down function, the user can read local video data stored and operate, and its concrete execution in step is as follows:
Step 1: long-distance user and local user ask video playback;
Step 2: the decoding function of audio frequency and video process chip is opened by system;
Step 3: call video data from local memory module, send to requesting client;
Step 4: detect the user and whether stop playback;
Step 5: do not have stop signal, continue execution in step 3;
Step 6: detect stop signal, close the decoding function of audio frequency and video process chip;
Step 7: continue to carry out the function that shows real time video data.
10, according to claims 4 described network video servers based on embedded platform, it is characterized in that described remote monitoring module is responsible for carrying out remote client's various requests, the IP address of fan-in network video server in the IE of monitor terminal browser, embedded network video server is according to request, show log-in interface, if user identity obtains confirming, then server can send to the user with ActiveX control, after user's download is installed control, according to buttons different on the webpage, operate accordingly, submit to network video server then, network video server is finished different operations according to the different information that the user submits to, as connecting, disconnect, playback, F.F., rewind down etc., concrete steps are as follows:
Step 1: the IP address of long-distance user's input video server, Connection Service device;
Step 2: server response long-distance user's connected reference shows log-in interface;
Step 3: the long-distance user lands;
Step 4: if long-distance user's status incongruence, then denied access request;
Step 5: by authentication, then server transmission ActiveX control downloads and installs for the long-distance user as if the long-distance user;
Step 6: the client downloads and ActiveX control is installed, and begins to carry out various remote operations, carries out remote real-time monitoring.
11, according to claims 4 described network video servers based on embedded platform, it is characterized in that described motion detection block comes the storage and the actuation of an alarm of control of video data by motion detection, begin not have the motion alarm signal, memory module is in wait state; The motion alarm signal arrives, start memory module, if do not continue to receive the motion alarm signal within a certain period of time, memory module quits work automatically, and memory space is than the much less of depositing continuously like this, and a large amount of nonmotile videos are cut have been cut out, improved deposit efficient greatly, saved memory space effectively, improved the service efficiency of video monitoring system, the specific implementation step is as follows:
Step 1: server is at first set surveyed area, the parameter of configuration-system;
Step 2: system will carry out video compression from the vision signal that camera acquisition comes, and the code stream of compression outputs in the buffering area;
Step 3: whether system detects has moving object to enter the zone of prior setting;
Step 4: system does not detect moving object, and promptly on-the-spot moving condition does not satisfy the condition of sending alarm signal, forwards step 2 to;
Step 5: when system had detected moving object and enters this zone, promptly on-the-spot moving condition satisfied the condition of sending alarm signal, and opens recording function automatically.
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