CN102695024A - Front-end recording system of network video recorder, and method therefor - Google Patents
Front-end recording system of network video recorder, and method therefor Download PDFInfo
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Abstract
The invention provides a front-end recording system of a network video recorder, and a method therefor. The method comprises: setting four variables, recording the initial and the end positions of video image data in a file, and recording the initial and the end positions of the offset of the video image data in the file in a buffer memory; receiving a frame of video image; when the file has no space to store the frame of image, moving the initial position in the buffer memory to a next buffer memory element code name, and changing the initial position in the file into the offset recorded in the initial position in the buffer memory; when the file has enough space to store the frame of image, determining if the frame of image is the first frame of image in a frame set; when the frame of image is the first frame of image, storing the frame of image in the file after recording the end position in the file into the buffer memory, changing the end position of the file according to the size of the frame of image, and moving the end position in the buffer memory to a next buffer memory element code name. The system and the method of the invention can use the disk space to simulate the queue in the front-end recording.
Description
Technical field
The present invention relates to a kind of front end video recording system and method for network video machine.
Background technology
Along with basic network is now more and more universal; People are outstanding to the networked increasing demand of monitoring, not only will realize monitoring in this locality, and also hoping can be through long-range; Even monitor through wireless mode, and these only carry out the demand that networking could be satisfied the user.Therefore, front end digitlization, networking are trends of the times, make that (Network Video Recorder NVR) has obtained wider popularizing for network monitoring product such as network video machine.
The function of making video recording before General N VR supports, because the internal memory of NVR is limited, if the quantity of the video camera channel of supporting (Camera Channel) is too many, the internal memory of NVR will use inadequately.
Summary of the invention
In view of above content; Be necessary to provide a kind of front end video recording system of network video machine; Its disk space capable of using comes the formation of AFE(analog front end) in making video recording, and when too many, not enough situation about using appears in the internal memory of network video monitor and control system with the quantity of the video camera channel that overcomes support.
Also be necessary to provide a kind of front end video recording method of network video machine; Its disk space capable of using comes the formation of AFE(analog front end) in making video recording; When too many, not enough situation about using appears in the internal memory of network video monitor and control system with the quantity of the video camera channel that overcomes support.
A kind of front end video recording system of network video machine; This system comprises: module is set is used to be provided with four variablees; With record video image data original position and end position hereof, and original position and the end position of the side-play amount of video image data in file in corresponding buffer memory; Memory module is used for receiving a frame video image through the video camera channel; The position update module is used for when not having enough spaces to store this frame video image with this video camera channel corresponding file; Move with the corresponding buffer memory of this document in original position to next buffer memory element code name; And the original position in this document changed over the side-play amount that original position write down in this buffer memory; And when said file has enough spaces to store this video image, judge whether this video image is first two field picture in the frame group; And logging modle is used for when this frame video image is first two field picture of frame group, the end position in the said file being recorded in this buffer memory; Said position update module also is used for when this frame video image is first two field picture of frame group; After said memory module is stored in said file with this frame video image; Change the end position of this document according to the size of this frame video image, and the end position in the said buffer memory is moved on to next buffer memory element code name.
A kind of front end video recording method of network video machine; This method comprises the steps: to be provided with four variablees; With record video image data original position and end position hereof, and original position and the end position of the side-play amount of video image data in file in corresponding buffer memory; Receive a frame video image through the video camera channel; When with the corresponding file of this video camera channel in when not having this frame video image of enough spaces storage; Move with the corresponding buffer memory of this document in original position to next buffer memory element code name, and the original position in this document changed over the side-play amount that original position write down in this buffer memory; When said file has enough spaces to store this frame video image, judge whether this frame video image is first two field picture in the frame group; When this frame video image is first two field picture in the frame group; After end position in the said file recorded said buffer memory; This frame video image is stored in this document; Change the end position of this document according to the size of this frame video image, and the end position in the said buffer memory is moved on to next buffer memory element code name.
Compared to prior art; The front end video recording system and the method for described network video machine; Can, the network video machine N equal-sized file (quantity of N=video camera channel) be set the quantity according to the video camera channel of supporting in advance when starting; And in internal memory configuration N equal-sized buffering; Dispose four variablees simultaneously and be used for record video image data original position, end position hereof respectively, and original position and the end position of the side-play amount of record video image data in file in corresponding buffer memory, and thus file is modeled to a formation; When too many, not enough situation about using appears in the internal memory of network video monitor and control system with the quantity of the video camera channel that overcomes support.
Description of drawings
Fig. 1 is the structural representation of network video machine of the present invention preferred embodiment.
Fig. 2 is the functional block diagram of the front end video recording system preferred embodiment of network video machine among Fig. 1.
Fig. 3 is the operation process chart of the front end video recording method preferred embodiment of network video machine of the present invention.
Fig. 4 is the original position of image document of the present invention in file and the sketch map of end position.
Fig. 5 is the original position of the side-play amount of image document of the present invention in file in buffer memory and the sketch map of end position.
The main element symbol description
| The |
1 |
| The front end video recording system of |
10 |
| |
12 |
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14 |
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16 |
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160 |
| Module is set | 100 |
| Memory module | 102 |
| The position update module | 104 |
| Logging modle | 106 |
Following embodiment will combine above-mentioned accompanying drawing to further specify the present invention.
Embodiment
As shown in Figure 1, be the structural representation of network video machine of the present invention preferred embodiment.The English full name of this network video machine 1 is Network Video Recorder, writes a Chinese character in simplified form NVR, below is referred to as NVR1.This NVR1 has front end video recording (pre-record) function.
Cause internal memory 16 not enough situation about using, the NVR1 in the present embodiment to utilize the front end video recording system 10 (being designated hereinafter simply as " front end video recording system 10 ") of network video machine to simulate the formation in the leading portion video recording for the quantity that solves the video camera channel (Camera Channel) 12 that NVR1 can support is too many with the form in magnetic disc space.Particularly; This front end video recording system 10 is provided with N equal-sized file 14 in advance according to the quantity of camera channel 12; Be used for the store video images data; And in the internal memory 16 of NVR1, dispose N equal-sized buffer memory 160, be used for the storage condition of record video image data at file 14.Through four variablees of configuration, front end video recording system 10 is modeled to a formation with a said N file, to alleviate internal memory 16 not enough situation about using.Concrete like the detailed description among Fig. 2 and Fig. 3.
In addition, in the present embodiment, above-mentioned N equals the quantity of said camera channel 12.
As shown in Figure 2, be the functional block diagram of front end video recording system 10 preferred embodiments among Fig. 1.This front end video recording system 10 comprises one or more software modules, and these one or more software modules are the software program section with specific function, is stored among the NVR1, and is controlled by this NVR1, to carry out the front end video recording method of this NVR1.
Said front end video recording system 10 comprises module 100, memory module 102, position update module 104 and logging modle 106 is set.
The said quantity that the camera channel 12 that module 100 is used for supporting according to NVR1 is set is provided with N equal-sized file 14 in advance, and in the internal memory 16 of NVR1 N equal-sized buffer memory 160 of configuration, wherein, N equals the quantity of said camera channel 12.A buffer memory 160 in each file 14 corresponding internal memory 16.
The said module 100 that is provided with also is used to be provided with four variablees; Original position (prs_start) and end position (prs_end) so that the record video image data is stored in file 14 reach original position (pri_start) and the end position (pri_end) of the side-play amount of video image data in file 14 in corresponding buffer memory 160.In the present embodiment, this side-play amount equals the length of a frame video image in the video image.
For the clear front end video recording formation analogy method of describing in the present embodiment; Be that example describes only below with a file 14; This document 14 is corresponding with video camera channel 12, and by the storage condition of the 160 document image data of the buffer memory in the internal memory 16 in this document 14.
Particularly, when video camera channel 12 was transferred to the video image of taking from the network camera (not shown), said memory module 102 was used for receiving continuously every frame video image of this video image, and promptly video image is the transmission of a frame one frame.
Said position update module 104 is used for judging with these video camera channel 12 corresponding files 14 whether enough this frame video images of space storage are arranged.
When judged result is when not having enough spaces to store this frame video image in the file 14, need the memory space of releasing document 14, simultaneously, the old image document that is write down in this document 14 pairing buffer memorys 160 need be eliminated.Therefore; Said position update module 104 needs original position pri_start in the mobile caching 160 to next buffer memory element code name (being pri_start=(pri_start+1) %*MAX_INDEX); And the original position prs_start in the file 14 changed over the side-play amount that original position pri_start write down in the buffer memory 160; Be prs_start=buffer (pri_start), wherein, MAX_INDEX be in the buffer memory 160 buffer memory element code name quantity.For example; Buffer memory 160 comprises six buffer memory element code names (being MAX_INDEX=6); Be respectively element code name " 0 ", " 1 ", " 2 ", " 3 ", " 4 " and " 5 ", in file 14, do not have enough this frame video images of space storage, when in " 5 ", being filled with image document like buffer memory element code name " 0 "; Said position update module 104 needs to eliminate in these buffer memorys 160 images recorded data the earliest, promptly above-mentioned " old image document ".Record order according to image document; Said position update module 104 will be eliminated the old image document of record in the buffer memory element code name " 0 "; Through the original position in the buffer memory 160 being moved to next buffer memory element code name, the side-play amount that original position write down that the original position in the file 14 changes in the buffer memory 160 is come the memory space in the releasing document 14.
When above-mentioned judged result is that said position update module 104 judges whether this frame video image is first two field picture in the frame group when having enough spaces to store this frame video image in the file 14.In the present embodiment, the video image data of a fragment is made up of multiple image, and the video image data of this fragment is called as a frame group.
If this frame video image is first two field picture in the frame group; Then logging modle 106 records the end position in the current file 14 in the buffer memory 160; There is this frame video image in the file 14 in said memory module 102; Said position update module 104 changes the end position of file 14 according to the size of this frame video image, and the end position in the buffer memory 160 is moved on to next buffer memory element code name, i.e. pri_end=(pri_end+1) %*MAX_INDEX.Particularly; When NVR1 started, as shown in Figure 4, original position prs_start (t) in the said file 14 and end position prs_end (t) all pointed to the starting point F0 of file 14; At this moment; The side-play amount of file 14 (offset) is 0, and the original position pri_start (t) in the buffer memory 160 as shown in Figure 5 and end position pri_end (t) also point to the starting point B0 of buffer memory 160, promptly points to element code name (index) and be 0 original position.And when memory module 102 existed this frame video image in the file 14, the end position in this document 14 can change over prs_end (t+1) by prs_end (t), and the end position in the buffer memory 160 is moved to the index=1 place.
If this frame video image is not first two field picture in the frame group, then memory module 102 is used for this frame video image is stored in file 14, and said position update module 104 changes the end position of file 14 according to the size of this frame video image.
As shown in Figure 3, be the operation process chart of preferred embodiment of the front end video recording method of network video machine of the present invention.
Step S01, the quantity that the camera channel 12 that module 100 can support according to NVR1 is set is provided with N equal-sized file 14 in advance, and in the internal memory 16 of NVR1 N equal-sized buffer memory 160 of configuration, wherein, N equals the quantity of said camera channel 12.A buffer memory 160 in each file 14 corresponding internal memory 16.For the clear front end video recording formation analogy method of describing in the present embodiment, below be that example describes only with a file 14.
Step S02; The said module 100 that is provided with is provided with four variablees; Original position (prs_start) and end position (prs_end) so that the record video image data is stored in file 14 reach original position (pri_start) and the end position (pri_end) of the side-play amount of video image data in file 14 in corresponding buffer memory 160.In the present embodiment, this side-play amount equals the length of a frame video image in the video image.
Step S03, video camera channel 12 are transferred to the video image of taking from network camera, the frame video image that memory module 102 receives in this video image, i.e. this video image of reception of memory module 102 1 frames one frame.
Step S04, position update module 104 judges whether enough this frame video images of space storage are arranged in the said file 14.If there are not enough this frame video images of space storage in the said file 14, then flow process gets into step S05.If enough this frame video images of space storage are arranged in the said file 14, then flow process gets into step S06.
Step S05; Original position pri_start in said position update module 104 mobile cachings 160 is to next buffer memory element code name; Be pri_start=(pri_start+1) %*MAX_INDEX, and the original position prs_start in the file 14 is changed over the side-play amount that original position pri_start write down in the buffer memory 160, be i.e. prs_start=buffer (pri_start); Then, flow process gets into step S04.Wherein, MAX_INDEX is the quantity of the buffer memory element code name in the buffer memory 160.
For example; Buffer memory 160 comprises six buffer memory element code names (being MAX_INDEX=6); Be respectively element code name " 0 ", " 1 ", " 2 ", " 3 ", " 4 " and " 5 ", in file 14, do not have enough this frame video images of space storage, when in " 5 ", being filled with image document like buffer memory element code name " 0 "; Said position update module 104 needs to eliminate in these buffer memorys 160 images recorded data the earliest, promptly above-mentioned " old image document ".Record order according to image document; Said position update module 104 will be eliminated the old image document of record in the buffer memory element code name " 0 "; Through the original position in the buffer memory 160 being moved to next buffer memory element code name; Original position in the file 14 is changed over the side-play amount that original position write down in the buffer memory 160, the memory space in can releasing document 14, and eliminate the old image document that is write down in the buffer memory 160.
Step S06, said position update module 104 judges whether this frame video image is first two field picture in the frame group.In the present embodiment, the video image data of a fragment is made up of multiple image, and the video image data of this fragment is called as a frame group.If this frame video image is first two field picture in the frame group, then flow process gets into step S07.If this frame video image is not first two field picture in the frame group, then flow process gets into step S08.
Step S07; Logging modle 106 records the end position in the current file 14 in the buffer memory 160; There is this frame video image in this document 14 in said memory module 102; Said position update module 104 changes the end position of this document 14 according to the size of this frame video image, and the end position in the buffer memory 160 is moved on to next buffer memory element code name, i.e. pri_end=(pri_end+1) %*MAX_INDEX.
Particularly; When NVR1 started, as shown in Figure 4, original position prs_start (t) in the said file 14 and end position prs_end (t) all pointed to the starting point F0 of file 14; At this moment; The side-play amount of file 14 (offset) is 0, and the original position pri_start (t) in the buffer memory 160 as shown in Figure 5 and end position pri_end (t) also point to the starting point B0 of buffer memory 160, promptly points to element code name (index) and be 0 original position.And when memory module 102 existed this frame video image in the file 14, the end position in this document 14 can change over prs_end (t+1) by prs_end (t), and the end position in the buffer memory 160 is moved to the index=1 place.
Step S08, memory module 102 is stored in this frame video image in the said file 14, and said position update module 104 changes the end position of this document 14 according to the size of this frame video image.
What this need explain be, Fig. 3 only illustrates storage of image document and record flow process, and in other embodiments, the execution in step that can circulate S03 shuts down up to NVR1 to step S08.
What should explain at last is; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although the present invention is specified with reference to preferred embodiment; Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the spirit and the scope of technical scheme of the present invention.
Claims (6)
1. the front end video recording method of a network video machine is characterized in that, this method comprises the steps:
Four variablees are set, with record video image data original position and end position hereof, and original position and the end position of the side-play amount of video image data in file in corresponding buffer memory;
Receive a frame video image through the video camera channel;
When with the corresponding file of this video camera channel in when not having this frame video image of enough spaces storage; Move with the corresponding buffer memory of this document in original position to next buffer memory element code name, and the original position in this document changed over the side-play amount that original position write down in this buffer memory; And
When said file has enough spaces this frame video image of storage and this frame video image to be first two field picture in the frame group; After end position in the said file recorded said buffer memory; This frame video image is stored in this document; Change the end position of this document according to the size of this frame video image, and the end position in the said buffer memory is moved on to next buffer memory element code name.
2. the front end video recording method of network video machine as claimed in claim 1 is characterized in that, this method also comprised before the step that four variablees are set:
The quantity of the camera channel of supporting according to the network video function is provided with N equal-sized file in advance, and in the internal memory of network video machine N equal-sized buffer memory of configuration, wherein N equals the quantity of said camera channel.
3. the front end video recording method of network video machine as claimed in claim 1 is characterized in that this method also comprises the steps:
When said file has enough spaces this frame video image of storage and this frame video image not to be first two field picture in the frame group, this frame video image is stored in the said file, change the end position of this document according to the size of this frame video image.
4. the front end video recording system of a network video machine is characterized in that, this front end video recording system comprises:
Module is set, is used to be provided with four variablees, with record video image data original position and end position hereof, and original position and the end position of the side-play amount of video image data in file in corresponding buffer memory;
Memory module is used for receiving a frame video image through the video camera channel;
The position update module; Be used for when not having enough spaces to store this frame video image with this video camera channel corresponding file; Move with the corresponding buffer memory of this document in original position to next buffer memory element code name; And the original position in this document changed over the side-play amount that original position write down in this buffer memory, and when said file has enough spaces to store this video image, judge whether this video image is first two field picture in the frame group; And
Logging modle is used for when this frame video image is first two field picture of frame group, the end position in the said file being recorded in this buffer memory; And
Said position update module; Also be used for when this frame video image is first two field picture of frame group; After said memory module is stored in said file with this frame video image; Change the end position of this document according to the size of this frame video image, and the end position in the said buffer memory is moved on to next buffer memory element code name.
5. the front end video recording system of network video machine as claimed in claim 4; It is characterized in that; The said quantity that the camera channel that module also is used for supporting according to the network video function is set is provided with N equal-sized file in advance; And in the internal memory of network video machine, dispose N equal-sized buffer memory, wherein N equals the quantity of said camera channel.
6. the front end video recording system of network video machine as claimed in claim 4; It is characterized in that; Said position update module also is used for when this frame video image is not first two field picture of frame group; After said memory module is stored in said file with this frame video image, change the end position of said file according to the size of this frame video image.
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| CN110874416A (en) * | 2018-09-04 | 2020-03-10 | 深圳云天励飞技术有限公司 | Image characteristic value storage method and device and electronic equipment |
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