CN107770468A - A kind of audio-video collection system and date storage method - Google Patents
A kind of audio-video collection system and date storage method Download PDFInfo
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- CN107770468A CN107770468A CN201610709508.8A CN201610709508A CN107770468A CN 107770468 A CN107770468 A CN 107770468A CN 201610709508 A CN201610709508 A CN 201610709508A CN 107770468 A CN107770468 A CN 107770468A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4204—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus
- G06F13/4221—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus
Abstract
The application is related to field of computer technology, more particularly to a kind of audio-video collection system and date storage method.Wherein method includes the request that audio-video collection module sends storage audio, video data to main control module；The main control module sends control instruction to the PCIe buses；Audio, video data after coding is stored in dma module by the audio-video collection module according to the control command by PCIe buses, and changes the control instruction in the PCIe buses；The main control module receives the interrupt requests that the dma module is sent, according to, by the amended control instruction of audio-video collection module, the audio, video data after being encoded in the dma module being stored into the PCIe buses in storage medium.The technical scheme provided from above the embodiment of the present application, DMA zero access modes are realized based on PCIe buses, the storage efficiency during audio-video collection can be greatly improved.
Description
Technical field
The application is related to field of computer technology, more particularly to a kind of audio-video collection system and date storage method.
Background technology
With the development of law system, increasing court needs the audio and video data on real-time coroner's court, in case
Used in retention is consulted the files, and existing audio-video collection and storage device are generally as shown in figure 1, video sampling and compressing card is required for list
A hard disk is connect, when the audio, video data for needing to store is more, expanding hard disk interface is relatively more tired on video sampling and compressing card
Difficulty, and the strong influence storage efficiency of audio, video data.
The content of the invention
In order to solve the problems, such as that audio, video data storage efficiency is low in the prior art, there is provided a kind of audio-video collection system
System and date storage method, audio, video data storage is greatly improved by PCIe buses and dma mode under ARM platforms
Efficiency.
The embodiments of the invention provide a kind of audio-video collection system, including,
Audio-video collection module, PCIe buses, main control module, dma module, storage medium；
The audio-video collection module, main control module, dma module are connected with PCIe buses, the storage medium with
The main control module is connected；
The audio-video collection module, for sending storage audio frequency and video number to the main control module by the PCIe buses
According to handshake request, the control instruction that the main control module received according to the PCIe buses is sent, the sound of collection is regarded
Frequency is stored to the dma module, and according to storage according to being encoded, by the audio, video data after coding by PCIe buses
Control instruction in PCIe buses described in results modification；The main control module, for holding according to the storage audio, video data
Hand asks to send control instruction to the PCIe buses, after the interruption that the dma module is sent is received, according to the PCIe
By the amended control instruction of audio-video collection module in bus, by the audio, video data after being encoded in the dma module
Read out and be stored in the storage medium.
The embodiment of the present invention additionally provides a kind of storage method of audio-video collection system, including,
Audio-video collection module sends the handshake request of storage audio, video data by PCIe buses to main control module；
The main control module sends control instruction to the PCIe buses；
The audio-video collection module encodes according to the control command to the audio, video data collected, will encode
Audio, video data afterwards is stored in dma module by PCIe buses, and in the PCIe buses according to the results modification of storage
Control instruction；
The main control module receives the interruption that the dma module is sent, according in the PCIe buses by the audio frequency and video
The amended control instruction of acquisition module, the audio, video data after being encoded in the dma module is stored into storage medium.
The technical scheme provided from above the embodiment of the present application, deposited at a high speed by realizing DMA based on PCIe buses
Mode is taken, the storage efficiency during audio-video collection can be greatly improved.
Certainly implementing any product of the application or method must be not necessarily required to reach all the above excellent simultaneously
Point.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in application, for those of ordinary skill in the art, do not paying the premise of creative labor
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 show existing audio-video collection and storage device structural representation；
Fig. 2 show a kind of structural representation of audio-video collection system of the embodiment of the present invention；
Fig. 3 show the structural representation of audio-video collection module of the embodiment of the present invention；
Fig. 4 show a kind of flow chart of the storage method of audio-video collection system of the embodiment of the present invention；
Fig. 5 show a kind of flow chart of DMA storage method of the ARM platforms of the embodiment of the present invention based on PCIe buses.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the application, it is real below in conjunction with the application
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described implementation
Example only some embodiments of the present application, rather than whole embodiments.It is common based on the embodiment in the application, this area
The every other embodiment that technical staff is obtained under the premise of creative work is not made, it should all belong to the application protection
Scope.
A kind of structural representation of audio-video collection system of the embodiment of the present application is illustrated in figure 2, is described in detail in this figure
The side being combined using a kind of PCIe (bus interface standards of Device-General) buses and DMA (direct memory access) memory module
Formula is included with improving the scheme of audio-video collection system storage efficiency in this programme：
Audio-video collection module 201, PCIe buses 202, main control module 203, dma module 204, storage medium 205.
The audio-video collection module 201, main control module 203, dma module 204 are connected with PCIe buses 202, institute
Storage medium 205 is stated with the main control module 203 to be connected；
The audio-video collection module 201, deposited for being sent by the PCIe buses 202 to the main control module 203
The handshake request of audio, video data is stored up, the control that the main control module 203 received according to the PCIe buses 202 is sent refers to
Order, encodes to the audio, video data of collection, the audio, video data after coding is stored to described by PCIe buses 202
Dma module 204, and the control instruction in the PCIe buses 202 according to the results modification of storage；
The main control module 203, for according to the handshake request of the storage audio, video data to the PCIe buses 202
Send control instruction, after the interruption that the dma module 204 is sent is received, according in the PCIe buses 202 by the sound
The amended control instruction of video acquisition module, the audio, video data after being encoded in the dma module 204 is read out and deposited
It is stored in the storage medium 205.
As one embodiment of the application, the audio-video collection module further comprises, is illustrated in figure 3 the present invention
The structural representation of embodiment audio-video collection module, video input unit 301, audio input unit 302, video encoding unit
303, audio coding unit 304, signaling control unit 305, the video input unit 301 and the video encoding unit 303
It is connected, the audio input unit 302 is connected with the audio coding unit 304, and the signaling control unit 305 is used for
The handshake request of storage audio, video data is sent by PCIe buses, and receives the control instruction of main control module, according to the control
System instruction controls the video decoding unit 303 to encode video data, and controls the video decoding unit 303 to pass through
Video data after coding is stored in dma module by the PCIe buses, controls the audio decoding unit 304 to voice data
Encoded, and control the audio decoding unit 304 that the voice data after coding is stored in into DMA by the PCIe buses
Module.The audio-video collection module can be multiple.
Wherein, video encoding unit can use the chip for supporting H.264 to encode to encode video data, and audio is compiled
Voice data can be carried out Linear Pulse Code Modulation (LPCM) by code unit, and the video input unit can connect for HDMI
Mouthful, or USB interface, the audio input unit can be TRS (a kind of COBBAIF), or RCA (transmits connecing for audio
Mouthful).
As one embodiment of the application, the storage medium includes hard disk, tape, solid state hard disc etc..
By embodiments of the invention, the data storage of high speed can be realized on the basis of PCIe buses, avoids master control
Module frequently produces interruption to control the storage of audio, video data, improves the storage efficiency of audio, video data.
A kind of flow chart of the storage method of audio-video collection system of the embodiment of the present invention is illustrated in figure 4, in the figure
The method for describing the high efficiency storage for realizing audio, video data by dma mode on based on PCIe buses, wherein this method
Specifically include：
Step 401, audio-video collection module sends shaking hands for storage audio, video data by PCIe buses to main control module
Request；
Step 402, the main control module sends control instruction to the PCIe buses；
Step 403, the audio-video collection module is compiled according to the control command to the audio, video data collected
Code, dma module, and the PCIe according to the results modification of storage are stored in by the audio, video data after coding by PCIe buses
Control instruction in bus；
Step 404, the main control module receives the interruption that the dma module is sent, according in the PCIe buses by institute
The amended control instruction of audio-video collection module is stated, the audio, video data after being encoded in the dma module is stored into storage
In medium.
As one embodiment of the application, comprised at least after the storage coding in the request of audio, video data, video
Number of channels, voice-grade channel quantity.
Wherein, the voice-grade channel quantity refers to that how many live audio collection device (such as microphone) carries out audio and adopted
Collection, the video channel quantity refer to that live how many video collector (such as camera) carries out video acquisition, such as right
For court's trial scene, video collector may need 3, and audio collection device needs 2, that is to say, that is wrapped in the request
3 road video datas and 2 road voice datas may be collected by including instruction audio-video collection module, pass through these information main control modules
May decide that will be divided into several blocks to carry per audio, video data all the way in dma module.
As one embodiment of the application, comprise at least, the audio channel information of distribution, distribute in the control instruction
Video channel information, the address of data is write in dma module, writes the sizes of data.
Wherein, main control module is according to the quantity of the audio frequency and video passage carried in request, by the dma module (example of particular size
Such as 8MB shared drive) multiple regions are divided into, for the audio number of the different passages of carrying audio-video collection module write-in
According to and video data, such as dma module is divided into 6 regions, a region is used to carry control instruction (1MB), 3 regions
(each region 2MB) is respectively used to carry 3 road video datas, and 2 regions (each region 512KB) are respectively used to carry 2 road sounds
Frequency evidence.
As one embodiment of the application, the size of said write data includes, and each video channel writes dma module
Number of frames, video quality grade.
Wherein, the number of frames refers to, is in the region that each video channel is distributed in dma module, is at best able to deposit
The data into how many frame are stored up, now according to the video channel information of distribution, the size in each region can be learnt, further according to video
The credit rating of data calculates the size of every frame data, and area size carries out computing with frame data size, you can obtains the area
How many frame data can be stored in domain (data for being directed to some passage), when audio-video collection module by PCIe buses to
After a certain amount of frame data are write in dma module, you can send interruption to main control module.
As one embodiment of the application, audio, video data includes after the coding, is encoded to video counts H.264
According to being encoded to LPCM voice data.
Wherein, in an embodiment of the present invention, above-mentioned coded format is simply illustrated, the sound carried out using other coding techniques
The coding of video data can be also applicable, and not limited herein.
As one embodiment of the application, the audio-video collection module is according to the control command to the sound that collects
Video data is encoded, and the audio, video data after coding is stored in into dma module by PCIe buses, and according to the knot of storage
After fruit changes the control instruction in the PCIe buses, further comprise, the audio-video collection module refers to according to the control
After audio, video data after part coding is stored into dma module by order, is sent and interrupted to main control module by dma module, looked into
The control instruction in the PCIe buses is ask to continue the audio, video data after coding being stored into dma module, the master control mould
Block is changed in the PCIe buses after the audio, video data after being encoded in the dma module is stored into storage medium
Control instruction is so that the audio-video collection module continues the audio, video data after coding being stored into dma module.
By embodiments of the invention described above, in the case of PCIe buses can be, audio, video data storage is improved
Efficiency.
A kind of flow chart of the DMA storage methods based on PCIe buses of the embodiment of the present invention is illustrated in figure 5, in detail in this figure
Describe how the audio, video data after coding by PCIe buses is stored in dma module by audio-video collection module, then by leading
Audio, video data is taken out and is stored in the process of external hard disk by control module from dma module, in system such as Fig. 2 of this method operation
And shown in Fig. 3, video input unit is connected to camera and microphone with audio input unit, for being adopted to audio frequency and video
The audio, video data that collection module input collects, includes in the method：
Step 501, audio-video collection module sends shaking hands for storage audio, video data by PCIe buses to main control module
Request.
In this step, video channel quantity (3 tunnel), voice-grade channel are included in the handshake request of the audio, video data
Quantity (2 tunnel)；Can also be 4 tunnel video channels and 4 road voice-grade channels in other embodiments.
Step 502, main control module initializes dma module according to the handshake request of storage audio, video data.
In this step, main control module is by PCIe bus initialization dma modules, that is, will be in dma module it is shared
Internal memory is reset, the data volume that the audio-video collection module carried in being asked according to above-mentioned storage may store, in shared drive
One piece of 8MB physical memory is distributed, the audio, video data after coding for caching the storage of audio-video collection module.
In this example, according to video channel quantity and voice-grade channel quantity, 8MB internal memories are divided into 6 regions, such as table
Shown in 1,
Table 1
| 1MB | 2MB | 2MB | 2MB | 512KB | 512KB |
| Control information | Video channel 0 | Video channel 1 | Video channel 2 | Voice-grade channel 0 | Voice-grade channel 1 |
3 video channels that wherein video channel 0- video channels 2 are corresponded respectively in video acquisition module, each video
Video data after channel coding is stored in corresponding region, because the voice data of voice-grade channel may be smaller, therefore only divides
Two regions for having matched somebody with somebody 512KB are used to store voice data, and certainly according to the difference of application scenarios, the size of regional can be with
Redistribute.
Wherein, include many contents in control information region, may be referred to shown in table 2 below,
Table 2
Wherein, each state of a control in sequence number 0-4：The effective 0x0 of 0x55 are invalid, video channel sequence number 0-2 positions：Video channel 0-
Whether 2 data are effective, voice-grade channel sequence number 3-4 positions：Whether voice-grade channel 0-1 data are effective.
Step 503, main control module sends control instruction to PCIe buses.
Interaction between main control module and audio-video collection module, main control module transmit the control instruction shown in above-mentioned table 2
Give PCI e buses：
When audio-video collection module is ready for interacting with main control module, audio-video collection module first is total by PCIe
" audio-video collection module status mark " is set to 0x55 in line, represents that audio-video collection module is the currently active, is ready to and master control
Module is communicated；
Main control module inquires " audio-video collection module status mark " when being 0x55, can write the tick times in shared
Deposit, when the tick times are as the time school of main control module and audio-video collection module, audio, video data synchronized timestamp；
DMA base address is write shared drive by main control module, specifically, shared drive is mapped to DMA bases by main control module
Address, when audio-video collection module stores audio, video data into dma module, according to pre-set audio, video data
Offset, by audio, video data storage arrive video channel 0/1/2 or the grade passage of voice-grade channel 0/1；
According to physical channel service condition will " " enabled voice-grade channel 0-1 " set, passage be effective by enabled video channel 0-2 "
Xaa is set to 0, represents that this passage enables；Passage is invalid to set to 0 x0, represents that this passage can not use, this control bit is entered by main control module
Row is set, such as when video channel 0 is arranged to 0, this PASS VIDEO is closed without storage；
Main control module determines " frame number passed every time " also just according to the size and video quality grade of each video channel
It is the video data frame number that audio-video collection module once sends dma module to, due to the frame of video of different video credit rating
It is of different sizes, therefore the complete frame of video quantity that can be write in each video channel (2MB) is also not quite similar, such as it is main
When control module setting " frame number passed every time " is 25, audio-video collection module can gather the frame number of video according to the frame number of setting,
When the frame number summation of collection is sets 25 frame of frame number, the video data for gathering enough frame numbers is write into the corresponding of dma module
Region of memory, notice dma module, which produces, to interrupt to make main control module obtain the data in dma module；
" video quality grade " is filled in, is worth for 0-15, bigger grade, and video quality is better；
" Tick times and DMA data address significant notation " is set to 0 into xaa, and (preceding, status data exist a Tick times high position
Afterwards).
Step 504, audio-video collection module carries out coding compression to the audio, video data collected.
In this step, such as the voice data by audio data coding boil down to LPCM forms, by video data encoding
The video data of boil down to H.264 form.
In the present embodiment, audio-video collection module is connected with 3 road video acquisition inputs, 2 road audio collection inputs altogether.
Step 505, control instruction of the audio-video collection module in PCIe buses, by the interface with PCIe buses to
Dma module sends the audio, video data after coding, according to by pre-set audio, video data offset, to the sound after coding
Video data is stored.
In this step, audio-video collection module judges the marking whether by master control mould of the audio frequency and video passage in control instruction
Block mark is 0；If 0 (explanation main control module receives data and finished, i.e. later step 508), can continue after coding
Audio, video data writes dma module by PCIe buses；Audio-video collection module is effective by video channel data in control instruction
Marking serial numbers 0-2, the set of voice-grade channel significant notation sequence number 3-4, it is provided with representing that this channel data is effective for 0x55, master control
Module can start to obtain the audio, video data in dma module and store into external hard disk, and 0 represents that this channel data is invalid,
Audio-video collection module does not complete the work that audio, video data is stored in dma module also, and main control module is unable to reading DMA module
In audio, video data.Above is audio-video collection module changes the general description of control instruction in PCIe buses, others mark
Will position may also need to carry out set modification according to control.
Wherein, audio, video data can also be encapsulated as by audio-video collection module by bnc_pcie_stream () function
Meet the data format of PCIe bus requests, the DMA data base address in control instruction (on application, divides 8M
The address of the shared drive in space, be mapped on DMA base address) write-in dma module correspondence memory region.
Step 506, after audio-video collection module writes audio, video data success in dma module, notice dma module production
Raw to interrupt, the dma module sends interruption to main control module.
In this step, after being write completely according to the region in control instruction for audio frequency and video channel allocation, that is, for each
After the 2MB memory headrooms of video channel distribution are write completely, and the 512KB memory headrooms distributed for each voice-grade channel are write completely
Afterwards, audio-video collection module triggering dma module produces interruption, and dma module produces interruption to main control module.
Wherein, audio-video collection module is empty according to the internal memory of video quality grade specified in control instruction to dma module
Between it is middle write-in respective numbers frame after, this write-in terminates, wait main control module the audio, video data in dma module is read out
To write external hard disk, constantly inquire about PCIe buses in control instruction (flag bit), if allow audio-video collection module after
It is continuous to be encoded the audio, video data collected, and to the audio, video data after dma module write-in coding.
Step 507, main control module passes through the audio, video data in PCIe bus reading DMA modules according to interruption.Its middle pitch
Video acquisition module can be not take up the interrupt source of cpu in audio-video collection module, and efficiently audio, video data is encoded；
And unified management and Resource allocation and smoothing of the main control module to data storage can be facilitated.
Step 508, the audio, video data of reading is stored into external hard disk by main control module.
Step 509, main control module changes the control instruction in the PCIe buses, is continued with warning tone video acquisition module
The audio, video data collected is encoded, and the audio, video data after coding is written in dma module.
In this step, the change that main control module can increase or decrease according to the number of channels of audio-video collection module,
Redistribution space is carried out to mapping shared section key domain, and changes the control instruction in PCIe buses.
Also, before audio-video collection module carries out audio, video data write-in to the region of memory of dma module again, also need
The region of memory is carried out the operation such as emptying.
Repeat the above steps 504-509, until the data of audio-video collection module are completely written and terminated into external hard disk.
Wherein, terminate be to close audio-video collection module.
By the method and system in above-mentioned the embodiment of the present application, in the case of PCIe buses being based on, improve sound and regard
The efficiency of frequency data storage.
Controller can be implemented in any suitable manner, for example, controller can take such as microprocessor or processing
Device and storage can by the computer of the computer readable program code (such as software or firmware) of (micro-) computing device
Read medium, gate, switch, application specific integrated circuit (Application Specific Integrated Circuit,
ASIC), the form of programmable logic controller (PLC) and embedded microcontroller, the example of controller include but is not limited to following microcontroller
Device：ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20 and Silicone Labs C8051F320, are deposited
Memory controller is also implemented as a part for the control logic of memory.
System, device, module or the unit that above-described embodiment illustrates, it can specifically be realized by computer chip or entity,
Or realized by the product with certain function.
For convenience of description, it is divided into various units during description apparatus above with function to describe respectively.Certainly, this is being implemented
The function of each unit can be realized in same or multiple softwares and/or hardware during application.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.It is real especially for system
For applying example, because it is substantially similar to embodiment of the method, so description is fairly simple, related part is referring to embodiment of the method
Part explanation.
Although depicting the application by embodiment, it will be appreciated by the skilled addressee that the application have it is many deformation and
Change is without departing from spirit herein, it is desirable to which appended claim includes these deformations and changed without departing from the application's
Spirit.
Claims (9)
- A kind of 1. audio-video collection system, it is characterised in that including,Audio-video collection module, PCIe buses, main control module, dma module, storage medium；The audio-video collection module, main control module, dma module are connected with PCIe buses, the storage medium with it is described Main control module is connected；The audio-video collection module, for sending storage audio, video data to the main control module by the PCIe buses Handshake request, the control instruction that the main control module received according to the PCIe buses is sent, to the audio frequency and video number of collection According to being encoded, the audio, video data after coding is stored to the dma module by PCIe buses, and according to the result of storage Change the control instruction in the PCIe buses；The main control module, refer to for sending control to the PCIe buses according to the handshake request of the storage audio, video data Order, after receiving the dma module and interrupting, according in the PCIe buses by the amended control of audio-video collection module System instruction, the audio, video data after being encoded in the dma module is read out and is stored in the storage medium.
- 2. system according to claim 1, it is characterised in that the audio-video collection module further comprises that video is defeated Enter unit, audio input unit, video encoding unit, audio coding unit, signaling control unit；The video input unit is connected with the video encoding unit, the audio input unit and the audio coding list Member is connected, and the signaling control unit is used for the handshake request that storage audio, video data is sent by PCIe buses, and receives The control instruction of main control module, the video decoding unit is controlled to encode video data according to the control instruction, and Video data after coding is stored in by dma module by the PCIe buses, controls the audio decoding unit to audio number According to being encoded, and the voice data after coding is stored in by dma module by the PCIe buses.
- 3. system according to claim 1, it is characterised in that it is hard that the storage medium includes hard disk, tape and/or solid-state Disk.
- A kind of 4. date storage method of audio-video collection system, it is characterised in that including,Audio-video collection module sends the handshake request of storage audio, video data by PCIe buses to main control module；The main control module sends control instruction to the PCIe buses；The audio-video collection module encodes according to the control command to the audio, video data collected, after coding Audio, video data is stored in dma module, and the control in the PCIe buses according to the results modification of storage by PCIe buses Instruction；The main control module receives the interruption that the dma module is sent, according in the PCIe buses by the audio-video collection The amended control instruction of module, the audio, video data after being encoded in the dma module is stored into storage medium.
- 5. according to the method for claim 4, it is characterised in that after the storage coding in the request of audio, video data at least Including, video channel quantity, voice-grade channel quantity.
- 6. according to the method for claim 4, it is characterised in that comprised at least in the control instruction, the audio of distribution is led to Road information, the video channel information of distribution, the address of data is write in dma module, writes the sizes of data.
- 7. according to the method for claim 6, it is characterised in that the size of said write data includes, each video channel Write the number of frames of dma module, video quality grade.
- 8. according to the method for claim 4, it is characterised in that audio, video data includes after the coding, is encoded to H.264 Video data, be encoded to LPCM voice data.
- 9. according to the method for claim 4, it is characterised in that the audio-video collection module is according to the control command pair The audio, video data collected is encoded, and the audio, video data after coding is stored in into dma module, and root by PCIe buses According to the control instruction in PCIe buses described in the results modification of storage, further comprise, the audio-video collection module is according to institute State control instruction by a part encode after audio, video data be stored into dma module after, by dma module to main control module send Interrupt, the control instruction inquired about in the PCIe buses, to continue the audio, video data after coding being stored into dma module, institute Main control module is stated after the audio, video data after being encoded in the dma module is stored into storage medium, changes the PCIe Control instruction in bus is so that the audio-video collection module continues the audio, video data after coding being stored into dma module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111526317A (en) * | 2020-04-20 | 2020-08-11 | 武汉卓目科技有限公司 | Low-delay image acquisition method, device and system |
| CN112087650A (en) * | 2020-07-27 | 2020-12-15 | 恒宇信通航空装备(北京)股份有限公司 | ARM-based graphic display control module in military airborne cockpit display system |
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