CN102547238A - Video cascade system applied in multi-channel DVRs (digital video recorder) and method - Google Patents
Video cascade system applied in multi-channel DVRs (digital video recorder) and method Download PDFInfo
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- CN102547238A CN102547238A CN2011104507596A CN201110450759A CN102547238A CN 102547238 A CN102547238 A CN 102547238A CN 2011104507596 A CN2011104507596 A CN 2011104507596A CN 201110450759 A CN201110450759 A CN 201110450759A CN 102547238 A CN102547238 A CN 102547238A
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Abstract
The invention discloses a video cascade system applied in multi-channel DVRs (digital video recorder) and a method, wherein the system comprises a plurality of slave video capture and coding modules and a master video capture and coding module, which are sequentially connected; each slave video capture and coding module and the master video capture and coding module are respectively connected with a video source module; and the master video capture and coding module is connected with a display device. Both the slave video capture and coding modules and the master video capture and coding module adopt master chip Hi3520 processor systems; and the slave video capture and coding modules and the master video capture and coding module sequentially transmit data by means of the BT.1120 protocol. Compared with the prior art, the video cascade mode adopted by the invention has the advantages that the dependence of the DVR of the multi-channel, multi-CPU (multi-central processing unit) scheme on the PCI (Peripheral Component Interconnect) is reduced and the reliability and stability of the system is enhanced.
Description
Technical field
The present invention relates to field of video monitoring, particularly a kind of video cascade system and method that is applied among the multichannel DVR.
Background technology
The clock frequency of PCI bus is generally used 33MHz, and in the 32bit system, theoretical limit speed can reach 132MB/s (32 * 33M/8); But PCI can't maintain the state of peak transmission always, generally can only remain on 30～50% efficiency of transmission, i.e. the speed of 40MB/s～60MB/s.Higher if desired transmission speed can be used the clock frequency of 66MHz, but along with the increase of frequency, also can be higher to the requirement of hardware designs.
In DVR equipment, particularly multichannel is counted the DVR of multi-CPU system, and the traditional data transmission realizes through PCI; When image resolution ratio was CIF in the past, because the data volume of image is smaller, preview can be transmitted through PCI with the video recording data; Along with the monitoring image definition requires increasingly highly, reach D1 or 720P, and even during 1080P; The bandwidth of PCI has satisfied not transmits preview and video recording data simultaneously; At this moment just need look for a kind of more suitably method transmission preview data, PCI only transmits the video recording data, just the data behind the coding.
Summary of the invention
The objective of the invention is to propose a kind of video cascade system and method that is applied among the multichannel DVR, mainly is to realize through PCI with the transmission means that solves existing DVR video data, the technical problem of the transmission requirement of the wireless DVR that satisfies the many CUP of multichannel number.
Technical scheme of the present invention is following:
A kind of video cascade system that is applied among the multichannel DVR comprises plurality of video capturing and coding slave module and a video acquisition coding primary module, and said plurality of video capturing and coding slave module links to each other with a video acquisition coding primary module in order; Said each video acquisition coding slave module and video acquisition coding primary module all are connected with video source module; Said video acquisition coding primary module is connected with a display device.
Preferably; Said plurality of video capturing and coding slave module comprises: first video acquisition coding slave module, second video acquisition coding slave module ..., N video acquisition coding slave module; Said first video acquisition coding slave module, second video acquisition coding slave module ..., N video acquisition coding slave module links to each other in order, and said N video acquisition coding slave module links to each other with said video acquisition coding primary module.
Preferably, said plurality of video capturing and coding slave module and a video acquisition coding primary module all adopt master chip Hi3520 processor system; Said plurality of video capturing and coding slave module and a video acquisition coding primary module transmit data in order through the BT.1120 agreement.
Preferably, said video acquisition coding slave module is set to the cascade pattern; Said video acquisition coding primary module is set to non-cascade pattern.
A kind of method based on said system comprises the following steps:
S1: said plurality of video capturing and coding slave module and said video acquisition coding primary module obtain corresponding image information from its corresponding video source module respectively;
S2: first video acquisition coding slave module is handled the image information of its acquisition, and gives second video acquisition coding slave module through its delivery outlet through the BT.1120 protocol transmission with those information;
S3: second video acquisition coding slave module is handled it respectively from the image information of video source module and the acquisition of first video acquisition coding slave module, and gives three video acquisition coding slave module through its delivery outlet through the BT.1120 protocol transmission with those information;
S4: the method for the 3rd video acquisition coding slave module to the N video acquisition coding slave module such as step S2 and S3 is transmitted data in order;
S5: N video acquisition coding slave module compiles the image information of N video acquisition coding slave module, it is carried out after data superpose, through its delivery outlet through the BT.1120 protocol transmission to the video acquisition primary module of encoding;
S6: video acquisition coding primary module is transferred to display device after the image information that obtains is handled.
Preferably, step S6 further comprises:
The information of video acquisition coding primary module after with the image information stack of front N video acquisition coding slave module, splice processing with the image information that is stored in said primary module inside after, be transferred to display device.
Preferably, said video source module is to its corresponding video acquisition coding slave module or video acquisition coding primary module input multiway images information.
Preferably, said image information comprises real time data or decoded data.
Compared with prior art, beneficial effect of the present invention is following:
The transmission means of existing DVR video data mainly is to realize through PCI, and the clock frequency of PCI bus is generally used 33MHz, and in the 32bit system, theoretical limit speed can reach 132MB/s (32 * 33M/8); But PCI can't maintain the state of peak transmission always, generally can only remain on 30～50% efficiency of transmission, i.e. the speed of 40MB/s～60MB/s.Higher if desired transmission speed can be used the clock frequency of 66MHz, but along with the increase of frequency, also can be higher to the requirement of hardware designs.With regard to the DVR by 16 road D1, if coded data, decoded data and preview data be all from PCI transmission, the bandwidth support of PCI not because the initial data of 1 road D1 is just up to 20MB/s.
The present invention adopts the mode of video cascade, has alleviated the dependence of the DVR of many CPU of multichannel number scheme to PCI, the reliability and stability of elevator system.The present invention utilizes the cascade system of a plurality of video capturing and coding slave module and a video acquisition coding primary module; Adopt preview data to transmit through the VI of the CPU of each inside modules and the mode of VO mouth cascade; And PCI transfer encoding data; Like this, the pressure of PCI is just little very many, and system works also can be more stable.
Description of drawings
Fig. 1 is a kind of structural representation that is applied to the video cascade system among the multichannel DVR of the specific embodiment of the invention;
Fig. 2 is a kind of flow chart that is applied to the video cascade method among the multichannel DVR of the specific embodiment of the invention.
Embodiment
The below combines accompanying drawing and specific embodiment that the present invention is done further description.
Embodiment
A kind of video cascade system that is applied among the multichannel DVR comprises plurality of video capturing and coding slave module and a video acquisition coding primary module, and said plurality of video capturing and coding slave module links to each other with a video acquisition coding primary module in order; Said each video acquisition coding slave module and video acquisition coding primary module all are connected with video source module; Said video acquisition coding primary module is connected with a display device.
Wherein, Said plurality of video capturing and coding slave module comprises: first video acquisition coding slave module, second video acquisition coding slave module ..., N video acquisition coding slave module; Said first video acquisition coding slave module, second video acquisition coding slave module ..., N video acquisition coding slave module links to each other in order, and said N video acquisition coding slave module links to each other with said video acquisition coding primary module.The N here is the integer more than or equal to 1.
Said plurality of video capturing and coding slave module and a video acquisition coding primary module all adopt master chip Hi3520 processor system; Said plurality of video capturing and coding slave module and a video acquisition coding primary module transmit data in order through the BT.1120 agreement.
Said video acquisition coding slave module is set to the cascade pattern; Said video acquisition coding primary module is set to non-cascade pattern.
The master chip Hi3520 processor system that the present invention adopts is built based on high performance ARM1176 and ARM926 dual core processor, and ARM1176CPU handles frequency and reaches 600MHz.ARM1176 is a main control processor, and ARM926 is for looking the audio service processor controls, and the double-core framework can provide more flexible and abundant applied business, and more high performance audio frequency and video are professional.
The ARM1176 processor: as the master cpu of whole system, collaborative hardware accelerator is accomplished audio/video encoding/decoding function and system call operation together.Embedded 16KB command cache of processor and 16KB data cache, embedded 2KB instruction close coupling memory I TCM, operating frequency can reach 600MHz.
This processor has abundant audio-video interface, and video interface comprises 4 video input interfaces, 2 digital video output interfaces, 6 analog video output channels.Operating frequency is supported 27/54/108 MHz, and video input main feature is following:
Support 4 road BT.656 YCrCb 4:2:2 interfaces, 8bit, 27/54/108MHz
Support the accurate SMPTE296M of 2 road signs, BT.1120 high definition sequential
Support Digital Camera digital interface, the ultimate resolution of support is that 1280*102430fps, 1600*120020fps, this characteristic of 2048*153610fps are also for realizing that video cascade provides good basis.
Like Fig. 1, in the present embodiment, said video cascade system comprises first video acquisition coding slave module 1, second video acquisition coding slave module 2, the 3rd video acquisition coding slave module 3 and video acquisition coding primary module 4.First video acquisition coding slave module 1, second video acquisition coding slave module 2, the 3rd video acquisition coding slave module 3 link to each other in order, and the 3rd video acquisition coding slave module 3 links to each other with video acquisition coding primary module 4.Said each module is provided with input port VI and delivery outlet VO.
The video acquisition coding slave module here has three, is merely for example, and the present invention does not make qualification to its number.
In an embodiment, video source module is 4 tunnel rig camera.First video acquisition coding slave module 1, second video acquisition coding slave module 2, the 3rd video acquisition coding slave module 3 and video acquisition coding primary module 4 are connected with first video camera 11, second video camera 21, the 3rd video camera 31 and the 4th video camera 41 respectively.All video cameras here are 4 the tunnel, are merely here for example, and during practical implementation, the present invention does not make qualification to the output way of video camera.Video acquisition coding primary module 4 is connected with a display device 5.
Like Fig. 2, the video cascade method based on said system comprises the following steps:
S1: said three video acquisitions coding slave module and video acquisition coding primary module obtain corresponding image information from its corresponding rig camera respectively.
S2: first video acquisition coding slave module is handled the image information of its acquisition, and gives second video acquisition coding slave module through its delivery outlet through the BT.1120 protocol transmission with those information.
In the present embodiment, first video acquisition coding slave module 1 is directly given the delivery outlet VO output of this module with real time data or decoded data that input port VI gathers.
S3: second video acquisition coding slave module is handled it respectively from the image information of video source module and the acquisition of first video acquisition coding slave module, and gives three video acquisition coding slave module through its delivery outlet through the BT.1120 protocol transmission with those information.
In the present embodiment, the delivery outlet VO of first video acquisition coding slave module 1 is through the BT.1120 agreement, gives the VI of second video acquisition coding slave module 2 with data passes, and VI is with data acquisition buffer memory in the sheet.
S4: the method for the 3rd video acquisition coding slave module to the N video acquisition coding slave module such as step S2 and S3 is transmitted data in order.
In the present embodiment, the VO of second video acquisition coding slave module 2 is through the BT.1120 agreement, gives the VI of the 3rd video acquisition coding slave module 3 with data passes, and VI is with data acquisition buffer memory in the sheet.
S5: N video acquisition coding slave module compiles the image information of N video acquisition coding slave module, it is carried out after data superpose, through its delivery outlet through the BT.1120 protocol transmission to the video acquisition primary module of encoding.
In the present embodiment, after the data stack in the real time data that the VO of the 3rd video acquisition coding slave module 3 gathers other VI passages of this film or decoded data and the sheet in the buffer memory, pass to the video acquisition primary module VI that encodes through the BT.1120 agreement again.
S6: video acquisition coding primary module is transferred to display device after the image information that obtains is handled.This step further comprises:
The information of video acquisition coding primary module after with the image information stack of front N video acquisition coding slave module, splice processing with the image information that is stored in said primary module inside after, be transferred to display device 5.
In the present embodiment, video acquisition coding primary module VI will synthesize picture and collect internal memory.This moment is to video acquisition coding primary module and stark one-tenth picture only is one road HD video, and the data class of gathering with other VI passages seemingly.
Real time data or decoded data that the main leaf application program is gathered other VI passages of this film after passing the synthetic picture of coming and splice once more with second video acquisition coding slave module 2, are given the VO output of video acquisition coding primary module and are presented on the terminal equipment.
Wherein, said video source module is to its corresponding video acquisition coding slave module or video acquisition coding primary module input multiway images information.Said image information comprises real time data or decoded data.
Mainly contain following four important configuration items in the video cascade configuration flow of Hi3520: passage, configuration cascade that configuration cascade master slave mode (except the video acquisition coding primary module 4), configuration picture layout, configuration cascade are bound enable.
In layoutprocedure, should be noted that following some:
The first, the video cascade function of Hi3520 can only be carried out on high definition passage (HD).
The second, during the multi-disc video cascade, main leaf with adopt different patterns from sheet:
Main leaf adopts non-cascade pattern.
Adopt the cascade pattern from sheet, the cascade pattern can be divided into holotype and from pattern.
For example, during four cascades of Fig. 1 were used, video acquisition coding primary module 4 adopted non-cascade pattern, and first video acquisition coding slave module 1, second video acquisition coding slave module 2, the 3rd video acquisition coding slave module 3 all adopt the cascade pattern.The VO equipment of first video acquisition coding slave module 1 is the source of BT.1120 timing sequence generating, need be configured to the cascade holotype; The VO equipment of second video acquisition coding slave module 2 is inherited the clock signal of first video acquisition coding slave module 1; The VO equipment of the 3rd video acquisition coding slave module 3 is inherited the clock signal of second video acquisition coding slave module 2, therefore only need be configured to cascade from pattern.
The preferred embodiment of the present invention just is used for helping to set forth the present invention.Preferred embodiment does not have all details of detailed descriptionthe, does not limit this invention yet and is merely described embodiment.Obviously, according to the content of this specification, can do a lot of modifications and variation.These embodiment are chosen and specifically described to this specification, is in order to explain principle of the present invention and practical application better, thereby person skilled can be utilized the present invention well under making.The present invention only receives the restriction of claims and four corner and equivalent.
Claims (8)
1. video cascade system that is applied among the multichannel DVR; It is characterized in that; Comprise plurality of video capturing and coding slave module and a video acquisition coding primary module, said plurality of video capturing and coding slave module links to each other with a video acquisition coding primary module in order; Said each video acquisition coding slave module and video acquisition coding primary module all are connected with video source module; Said video acquisition coding primary module is connected with a display device.
2. system according to claim 1; It is characterized in that; Said plurality of video capturing and coding slave module comprises: first video acquisition coding slave module, second video acquisition coding slave module ..., N video acquisition coding slave module; Said first video acquisition coding slave module, second video acquisition coding slave module ..., N video acquisition coding slave module links to each other in order, and said N video acquisition coding slave module links to each other with said video acquisition coding primary module.
3. system according to claim 2 is characterized in that, said plurality of video capturing and coding slave module and a video acquisition coding primary module all adopt master chip Hi3520 processor system; Said plurality of video capturing and coding slave module and a video acquisition coding primary module transmit data in order through the BT.1120 agreement.
4. system according to claim 3 is characterized in that, said video acquisition coding slave module is set to the cascade pattern; Said video acquisition coding primary module is set to non-cascade pattern.
5. the method based on each said system of said claim 1 to 4 is characterized in that, comprises the following steps:
S1: said plurality of video capturing and coding slave module and said video acquisition coding primary module obtain corresponding image information from its corresponding video source module respectively;
S2: first video acquisition coding slave module is handled the image information of its acquisition, and gives second video acquisition coding slave module through its delivery outlet through the BT.1120 protocol transmission with those information;
S3: second video acquisition coding slave module is handled it respectively from the image information of video source module and the acquisition of first video acquisition coding slave module, and gives three video acquisition coding slave module through its delivery outlet through the BT.1120 protocol transmission with those information;
S4: the method for the 3rd video acquisition coding slave module to the N video acquisition coding slave module such as step S2 and S3 is transmitted data in order;
S5: N video acquisition coding slave module compiles the image information of N video acquisition coding slave module, it is carried out after data superpose, through its delivery outlet through the BT.1120 protocol transmission to the video acquisition primary module of encoding;
S6: video acquisition coding primary module is transferred to display device after the image information that obtains is handled.
6. method according to claim 5 is characterized in that step S6 further comprises:
The information of video acquisition coding primary module after with the image information stack of front N video acquisition coding slave module, splice processing with the image information that is stored in said primary module inside after, be transferred to display device.
7. method according to claim 5 is characterized in that, said video source module is to its corresponding video acquisition coding slave module or video acquisition coding primary module input multiway images information.
8. method according to claim 5 is characterized in that said image information comprises real time data or decoded data.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103118247A (en) * | 2013-02-22 | 2013-05-22 | 华为技术有限公司 | Video data processing method, video data processing device, video cascading system and chip |
| CN103347169A (en) * | 2013-06-25 | 2013-10-09 | 杭州中威电子股份有限公司 | Cascading node equipment used for high-speed wireless cascading digital video transmission network and method |
| CN104660871A (en) * | 2013-11-19 | 2015-05-27 | 深圳锐取信息技术股份有限公司 | Record-broadcast all-in-one machine based on embedded mixed hardware architecture |
| CN105592290A (en) * | 2014-10-20 | 2016-05-18 | 广东中星电子有限公司 | High-resolution video source compression method and high-resolution compressed video display method |
| CN105657292A (en) * | 2016-01-29 | 2016-06-08 | 北京小鸟科技发展有限责任公司 | Cascading method and cascading system for multiple video stitching processors |
| CN106331650A (en) * | 2016-09-27 | 2017-01-11 | 北京乐景科技有限公司 | Video data transmission method and apparatus |
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- 2011-12-29 CN CN2011104507596A patent/CN102547238A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103118247A (en) * | 2013-02-22 | 2013-05-22 | 华为技术有限公司 | Video data processing method, video data processing device, video cascading system and chip |
| CN103118247B (en) * | 2013-02-22 | 2016-08-10 | 华为技术有限公司 | Video data handling procedure and device, video cascade system and chip |
| CN103347169A (en) * | 2013-06-25 | 2013-10-09 | 杭州中威电子股份有限公司 | Cascading node equipment used for high-speed wireless cascading digital video transmission network and method |
| CN104660871A (en) * | 2013-11-19 | 2015-05-27 | 深圳锐取信息技术股份有限公司 | Record-broadcast all-in-one machine based on embedded mixed hardware architecture |
| CN105592290A (en) * | 2014-10-20 | 2016-05-18 | 广东中星电子有限公司 | High-resolution video source compression method and high-resolution compressed video display method |
| CN105657292A (en) * | 2016-01-29 | 2016-06-08 | 北京小鸟科技发展有限责任公司 | Cascading method and cascading system for multiple video stitching processors |
| CN106331650A (en) * | 2016-09-27 | 2017-01-11 | 北京乐景科技有限公司 | Video data transmission method and apparatus |
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Application publication date: 20120704 |