CN106412518A - Wireless video transmission system based on TD-LTE emergency communication - Google Patents
Wireless video transmission system based on TD-LTE emergency communication Download PDFInfo
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- CN106412518A CN106412518A CN201610914605.0A CN201610914605A CN106412518A CN 106412518 A CN106412518 A CN 106412518A CN 201610914605 A CN201610914605 A CN 201610914605A CN 106412518 A CN106412518 A CN 106412518A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
- H04L65/764—Media network packet handling at the destination
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention provides a wireless video transmission system based on TD-LTE emergency communication. The system comprises at least one mobile communication terminal, a base station and a monitoring center. The mobile communication terminal is used for collecting video data, compressing and encoding the collected video data, and transmitting the compressed and encoded video data to a base station through a TD-LTE wireless communication network. The base station is used for receiving the compressed and encoded video data transmitted by the mobile communication terminal, and transmitting the compressed and encoded video data to a server of the monitoring center through the TD-LTE wireless communication network for decoding and displaying. According to the invention, the user interface thread of a message response mechanism is used for receiving; packet loss caused by a traditional thread which uses a circular matching sleep function can be effectively solved; the frame information and the packet sequence of the data packet are detected on a receiving end to determine the storage location of each video packet in a circular linked list to prevent chaos caused by a UDP transmission protocol.
Description
Technical field
The invention belongs to Real-time Video Transport Technology field is and in particular to a kind of wirelessly regarding based on TD-LTE emergency communication
Frequency Transmission system.
Background technology
With scientific and technological continuous development, people for the emergency event such as fire, earthquake, attack rescue operations increasingly
Pay attention to.All include a Surveillance center, some live video collection points in general rescue communication system and some accept language
The calling terminal of sound order.Traditional video acquisition point is all fixing camera, and the video data collecting is passed through Ethernet
It is sent to control and command center, this transmission means is excessively inflexible, one is the limitation of its control and monitoring, can only supervise solid
Fixed scope is it is impossible to dynamically move；Two is that the infrastructure of this mode is easy to be destroyed, once main line or certain
Individual important forward node breaks down, then whole Video transmission system all will be paralysed, and adopt TD-LTE wireless network as transmission
Channel then can avoid these drawbacks.Typically during multiple threads, will be maintained by circulation after sub- thread creation
The existence of thread, and in order to prevent sub-line journey occupying system resources always, sub-line journey can add dormancy mechanism, but,
During the reception of Video transmission system, if adding dormancy function can lead to the loss of packet, picture when serious, can be led to
Distortion.
Content of the invention
In view of this, it is an object of the invention to provide a kind of wireless video transmission system based on TD-LTE emergency communication.
The purpose of the present invention is achieved through the following technical solutions, and the wireless video based on TD-LTE emergency communication passes
Defeated system, including at least one mobile communication terminal, base station and Surveillance center；
Mobile communication terminal：For gathering video data, and the video data being gathered is compressed encoding, passes through
TD-LTE cordless communication network is by the video data transmission after compressed encoding to base station；
Base station：For receiving the video data after the compressed encoding that mobile communication terminal transmits, by TD-LTE no
Video data transmission after compressed encoding is made decoding process and is shown to the server of Surveillance center by line communication network.
Further, the video data of collection is compressed video data after coding in UDP mode mobile communication terminal
It is transferred to base station, then Surveillance center is forwarded to by base station.
Further, frame data are divided into several UDP subpackages to be stored in buffer area by mobile communication terminal, then divide UDP
Bag sends to base station from video sending end mouth in order, then is forwarded to Surveillance center by base station.
Further, the server of Surveillance center is opened up port according to No. IP pre-setting and is received UDP subpackage, receives
Data be stored in buffer area.
Further, each mobile communication terminal has the receiving thread corresponding with this mobile communication terminal, order caching
And decoding broadcasting thread.
Further, described mobile communication terminal has Big Dipper GPS dual-mode positioning function.
Further, the video data that the server of Surveillance center receives is extracted from buffer area, is then passed through
Ffmpeg video processing program by decoded packet data and is converted to the form of stream, and the vision storehouse eventually passing OpenCV is made video and shown
Show.
Due to employing technique scheme, the present invention has the advantage that：
The data volume of transmission of video is very huge, therefore, must be compressed before transmitting the data encoding, then connect
Receiving end is decoded playing, and H264 standard used in the present invention is compared to H263 and H261 being used in a network at present
Compression standard has higher code efficiency.
In video reception module, the present invention is received using the user-interface thread of message response mechanism, can be effective
Ground solves traditional thread using the packet drop caused by circulation cooperation dormancy function, in the frame information of receiving terminal detection data bag
With packet sequence, to determine the storage location of each video bag entrance circular linked list, prevent the out of order feelings that UDP host-host protocol causes
Condition.In addition, the present invention is in the table tennis buffer adding a Twin Cache Architecture in the middle of decoder module and playing module, data warp
Cross decoding after be stored in units of frame in caching, the operational capability of processor can be effectively improved, and prevent data because
The difference of cross-thread processing speed and coating losing of cover.
Brief description
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing the present invention is made into
The detailed description of one step, wherein：
Fig. 1 is the data transmission system structural representation based on TD-LTE emergency communication；
Fig. 2 is the data transmission system theory diagram based on TD-LTE emergency communication；
Fig. 3 is the flow chart of transmitting terminal video acquisition process；
Fig. 4 is transmitting terminal video coding process；
The data receiver thread that Fig. 5 is set up by message response mechanism for receiving terminal；
Fig. 6 plays thread for the video decoding that receiving terminal is set up by endless loop；
Fig. 7 is the course of work of all threads of whole video receiver；
Fig. 8 is the operation principle of the frame buffer part after decoding.
Specific embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；It should be appreciated that preferred embodiment
Only for the present invention is described, rather than in order to limit the scope of the invention.
As shown in Figure 1, 2, the wireless video transmission system based on TD-LTE emergency communication, including at least one mobile communication
Terminal, base station and Surveillance center.Each mobile communication terminal can know in advance Surveillance center the network information and will be
Register on the database of Surveillance center, mobile communication terminal sends the network letter of oneself with cycle regular hour to Surveillance center
Breath, online user's list also constantly detects with the regular hour in Surveillance center, if the time exceeds certain limit, Surveillance center
Never receive the network information of some mobile communication terminal, illustrate that this user is not online, Surveillance center will update again
User list.
Mobile communication terminal mainly includes video acquisition module, display control module, communications module and power supply mould
Block.Surveillance center mainly has server or the PC of multiple threads function.In mobile communication terminal and Surveillance center
On all control the reception of video data, encoding and decoding and playing process using the object oriented language that can process multi-threaded business.
Mobile communication terminal：For gathering video data, and the video data being gathered is compressed encoding, passes through
TD-LTE cordless communication network is by the video data transmission after compressed encoding to base station；
Base station：For receiving the video data after the compressed encoding that mobile communication terminal transmits, by TD-LTE no
Video data transmission after compressed encoding is made decoding process and is shown to the server of Surveillance center by line communication network.Prison
The video data that the server at control center receives is extracted from buffer area, and being then passed through Ffmpeg video processing program will
Decoded packet data is simultaneously converted to the form of stream, and the vision storehouse eventually passing OpenCV is made video and shown.
As improvement of the present invention, frame data are divided into several UDP subpackages to be stored in buffer area by mobile communication terminal,
Then UDP subpackage is sent to base station from video sending end mouth in order, then Surveillance center is forwarded to by base station.Surveillance center
Server is opened up port according to No. IP pre-setting and is received UDP subpackage, and the data receiving is stored in buffer area.
Due to the present invention in video reception using UDP host-host protocol, there is low time delay；In order to overcome UDP transmission association
The shortcoming of view poor reliability, the present invention adopts the reception mechanism of parallel multithreading reception and independent storage, and as each road is moved
Mobile communication terminal opens up a single receiving thread and order caching, makes server permissible before next packet arrives
Complete receives and stores current data packet, and under the conditions of equivalent network, the method can greatly drop compared to serial received
Low packet loss ratio；Adopt method rather than the method using endless loop of message response in DRP data reception process, ensure packet loss
Rate within the specific limits on the premise of, the method have the advantages that reduce CPU consume.
During wireless video transmission, using inter prediction encoding, video can be lifted to coding video data
Code efficiency.In inter prediction encoding, generate frame input picture being encoded by its own at a prescribed interval
Intra coded frame (I image), multiple frames that the difference generating each other to input picture and prognostic chart picture in I image is encoded
Between coded frame (P image or B image), therefore, it is possible to significantly compressed video data.Collected video data entered before this
Enter buffer zone, the playback thread of mobile communication terminal and compressed encoding thread independence read data in buffer zone, such as
The video blur of fruit playback or discontinuous, illustrates the video data distortion collecting, mobile communication terminal user should weigh
New collection.Compressed encoding thread is sent to socket from the data that buffer zone is read after H.264 standard compression coding
Send.
As the improvement to invention, add Big Dipper GPS dual-mode positioning function in the transmission terminal of mobile communication terminal, lead to
Cross the ready-made program algorithm of storage, obtain accurately and reliably geographical location information.The working method of bimodulus positioning is compared to single mode
Positioning can preferably ensure location accuracy and reliability, if the satellite-signal of one of which alignment system is lost, acceptable
Another alignment system is relied on to carry out location navigation.Mobile communication terminal after collecting one-frame video data, will pass through by system
The particular geographic location that bimodulus positioning obtains this video acquisition point is sent to Surveillance center in the lump, is dug by data in Surveillance center
The mode separation video data of pick and geography information.By being accurately positioned, user can be allowed to understand the situation of oneself in real time,
Surveillance center can also be allowed to be better understood upon the surrounding enviroment of rescue site.
In the present invention, it is provided with least one mobile communication terminal, each road mobile communication terminal all can be unified to lead to
Cross TD-LTE network and send video data to Surveillance center in real time, but the limitation due to Surveillance center's screen size, be
Ensure accuracy and the picture quality of video information, Surveillance center can only optionally receive and play each mobile terminal and adopts
The video of collection.So, in rescue operations, rescue worker can set current urgency level, monitoring according to live state of affairs situation
Emergency degree according to accident is that each road video sets priority by center, and according to the selective reception of priority and plays
The video data of each road terminal, if there is the emergency of burst, rescue worker can directly be referred to by voice call request
The personnel that wave carry out video communication with oneself.Commanding can change oneself by currently online list needs the video of viewing,
Detailed picture and the details that this road video is watched on a certain road therein can also be entered.
In traditional Surveillance center's design process, in order to reduce computing cost, only with opening up a port serial received
All terminals or the data volume of multiple terminal, data unification are stored in a caching, then carry when decoding is play
Fetch data to separate by characteristic information and identify, data is delivered to corresponding broadcast window, this way does not need to reach for receiving
Monitoring system to fine definition is that comparison is rational, but is but unfavorable for the complete transmission of HD video, when in the unit interval
It is easy to cause larger packet loss, finally when the receiving data amount of monitoring client is less than the data volume that all video terminals send
Necessarily lead to distortion, and the confusion that crosstalk causes picture easily in the method.In the present invention it is contemplated that the matter of video
Amount problem, video acquisition set of frequency to more than 8000Hz, sample rate more hi-vision is more clear, and data volume is also huger,
Therefore, when a certain road video be monitored commanding be set as reception state when, the video reception in the present invention is using connecing parallel
Receipts pattern, sets single receiving thread, order caching and decoding for this road video and plays thread, can ensure video
Reduce while high-quality and receive time delay and packet loss.
Mobile communication terminal of the present invention is to add on the embedded development platform based on Leonardo da Vinci's digital image processing techniques
To realize.At present, more popular DM37x/AM37x series is high-performance, digitally enhanced Media Processor, and this framework carries
Supply abundant Peripheral Interface, fully meet user various to network interface, S-VIDEO interface, audio input output interface, USB etc.
The demand of interface, this framework is primarily used to ARM and figure demonstrating, has the advantages that low-power consumption.Typical Representative is DM3730/
AM3715 processor, this processor is integrated with the ARM kernel of high primary frequency and the DSP with advanced digital signal disposal ability
Core.
When carrying out video acquisition, it is first turned on vision operation acquisition equipment state and whether the state of testing equipment is permissible
It is activated.Then again equipment is opened with read-write, non-blocking mode, whether query facility supports that V412 programs, and enumerates this equipment and props up
The video format held and video size, video format and size that finally setting system needs, video format is set to YUV lattice
Formula, picture altitude is 240, and picture traverse is 320.
Utilizing camera interface ISP that DM37x/AM37x series platform is provided compatible CCD industry camera and cmos digital
Camera, supports BT.601, BT.656 standard simultaneously.The bottom that 2D/3D figure accelerates accelerates the figure application speed of 2D and 3D
Degree, its SGX bottom is based on programmable POWERVR graphics core of new generation, and this framework has extensibility.
Apply for an empty video cache area queue in a device and preserve the relevant information of queue, will get simultaneously
Actual queue length in value extract, this length typically not can exceed that five video cache areas, then for each video
The kernel spacing application internal memory that buffer area is located, the kernel spacing applied for needs to be mapped to user's space.Finally, application is identical
The RGB image buffering area of number, for the display in terminal.
The logic providing storage frame buffer under the main interface in LCD or TV being used for display in mobile communication terminals regards
Frequency image, bottom module includes：Display control module, Remote Frame Buffer interface module, display serial line interface I/O module and
DSI protocol engine, DSI PLL controller drive and NTSC/PAL Video coding.NTSC is two kinds of different TV marks from PAL
Standard, wherein it is adaptable to China and Europe be PAL standard it is contemplated that with domestic being consistent property of other equipment, in mobile communication
Terminal uses PAL standard.
The view data collecting will be saved in by a YUV image opening 10 frame signs by event-driven mechanism
In buffer queue, the maximum buffer size of the every two field picture wherein opened up is 153600B.Every frame in YUV image buffering area
Image will be called in Video coding thread.
Video coding uses the H264 Video Coding Scheme based on davinci platform, and this standard is built upon MPEG-4
On the basis of technology, encoding and decoding flow process substantially can be divided into five steps：Interframe and infra-frame prediction, conversion and inverse transformation, quantization and
Inverse quantization, loop filtering, entropy code.Compared with other existing video encoding standards, H.264 standard is under the conditions of comparable bandwidths
There is to the quality of image more preferable guarantee, and this standard be under the premise of ensureing identical image quality, its compression efficiency than
Standard in the past exceeds 2 times about.
Mobile communication terminal uses the 10/100M adaptive network interface of DM9000, and DM9000 is low-power consumption, highly
It is integrated with the chip of fast Ethernet controller and general processor, network interface includes road 10/100M PHY and 4K
DWORD SRAM, this chip supports the I/O interface of 3.3V and 5V.Wherein, the built-in 10/100M Ethernet module of DM9000,
Its compatibility IEEE 802.3 standard agreement, cable interface is standard RJ45, can be connected to network hub by Straight-Through Cable
On.
Due in video coding process, each attached bag after each frame data subpackage put into UDP transmit queue when
Between be spaced apart 5ms, in order to realize placing data into UDP queue and the synchronization taking out data from UDP queue, the transmission interval of video
Also it is set to 5ms.
Video data enters in LTE network eventually through LTE dual-polarization intelligent antenna.Dual-polarization intelligent antenna uses one group
Dual-polarization radiating unit replaces original single polarization radiating element, and array quantity is reduced to original half, is being protected with reaching
Hold port sum constant on the premise of, reduce antenna width purpose.Dual-polarization intelligent antenna generally adopts+45 in engineering
With the arrangement mode of -45 degree radiating elements, the dual polarization N*2 antenna linear array forming in this way, wherein N is same polarization spoke
Penetrate number of unit, shown according to current theoretical research, emulation and test, prioritizing selection N=4.
The power management module of mobile communication terminal includes power source management controller, USB high-speed transfer controls, LED drives
Control, analog-to-digital conversion (ADC), real-time clock (RTC) and embedded Clock management (EPC) etc..
The wireless video transmission of the present embodiment is based on cross-platform design, and transmitting terminal is based on (SuSE) Linux OS
Embedded board on realize, and the receiving terminal of wireless video transmission system is based on the PC in Windows operating system
Realize on machine or mainframe computer.Set up the DBM of Surveillance center by MySQL with reference to MFC, each online terminal
Once start can be registered in Surveillance center automatically, the online list of Surveillance center's real-time detection.By in MFC encapsulation API and
Related class realizes the reception of data and the establishment of thread and control, in conjunction with ffmpeg and OpenCV realize the decoding of video with
Play.
Fig. 4 sends the basic step of video for mobile communication terminal, after mobile communication terminal collects frame data, will
It carries out compression coding (K in units of KByte>0) it is divided into several UDP bags.Moving picture encoding process in the present invention
In, some width data images collecting are divided into P frame and I frame, I frame is data display, is the key frame of image, P frame is ginseng
Examine frame, be by the P frame before it or I frame prediction, it and it before P frame or I frame between identical information or
Data is compared, namely considers that the characteristic moved carries out interframe compression.Take P frame and I frame is combined the method for compression and be can reach
Higher compression and no obvious compression vestige.
Fig. 5 represents Surveillance center's receiving thread groundwork flow process, this thread using message response mechanism reach no dormancy,
The reception of low time delay.Generally, it is necessary to maintain its existence using circulative metabolism after the sub- thread creation of work, but
It is that unlimited circulation work can take arithmetic unit always, lead to system crash the most at last, in order to avoid this kind of event occurs, following
Need in ring working mechanism to add dormancy mechanism, alleviate the pressure of processor, and for RTTS, add dormancy mechanism
Very big packet loss will be led to, be eventually exhibited as video pictures very discontinuous.The invention provides a kind of real-time Transmission
The creation method of sub-line journey, and the method does not need dormancy, interim when there being data, thread is started working, and does not have data to arrive
Shi Ze does not work.
The class libraries MFC being encapsulated by Microsoft provides abundant class and API, is monitoring central server software module
Realization established environmental basis.In order to meet more preferable Consumer's Experience, when field condition is not very urgent or is related to individual
During people's privacy, rescue worker can voluntarily close video, and one can save the energy of terminal, and two can be other mobile
Terminal vacates access point.The video data that this also just determines mobile communication terminal is not to have in the moment.The present invention passes through
Create the receiving thread that the derived class inherited in Thread base class realizes Surveillance center, compared to the implementation method of common thread,
It is advantageous that：Work need not be circulated and maintain the existence of itself, message response mechanism can be embedded in thread, when there being video counts
Interim according to coming, receiving thread meeting real-time reception data, interim when not having data, thread is in listening state, waits pending data to arrive
Come, so also just eliminate dormancy mechanism, reduce the demand that this characteristic has catered to low time delay and low packet loss ratio in real-time Communication for Power.
As shown in fig. 7, an independent thread is created by AfxBeginThread in main thread, state in this thread
And define the execution function of an establishment socket port.Create a derived class derived from the Socket class of MFC, statement is simultaneously
Define it and receive receptance function, write and send the receiver function of being consistent property of terminal in this function.Then receiving line
The pointer variable of a Socket derived class is stated in journey, in the object opening the mono- Socket derived class of local new monitored,
Create port numbers with this object in the receiving thread function above creating, then bind a SOCKADDR_IN object it is intended that
Transmitting terminal address is arbitrary address, as long as sending data on the receiving port that created toward main frame of transmitting terminal, will trigger this group
The reception receptance function receiving data of raw class.
In the transmission of video of the present invention, there are two kinds of different buffer zones, first is order caching region BUFFER,
Second is decoding buffer zone buffer.Order caching is the sufficiently large annular BUFFER of a capacity, and receiving data bag is same
Leave in same annular BUFFER, due to the mark of corresponding window number all being had on the node deposit data, decode thread
Only data need to be decoded to corresponding broadcasting in caching according to mark when accessing this BUFFER.Due to connecing of video data
Receive, decoding is all nonsynchronous with broadcasting thread, in order to prevent the data after decoding from losing, the present invention regards on each road
The less table tennis buffer of distribution one after frequency decoding, its structure is as shown in figure 8, the frame data having solved are deposited by decoding thread
It is placed in a buffer cell, after this buffer cell is filled with, decoding thread starts for data to be stored in another buffer cell,
And play thread and start to read data, two buffer cells of two thread alternate access from buffer cell above, make each
What frame video data was complete is shown in corresponding window.Because video data bag follows the read-write order of first in first out, so
Annular BUFFER is actually a FIFO, and its minimum-depth is：
Delph=B_Length- (B_Length/w_clk) * (Numclk/Wlength) * (r_clk/w_clk) wherein, B_
Length represents the data length of burst write；W_clk represents write cycle time clock；R_clk represents read cycle clock；NumclkTable
Show write cycle time clock number；WlengthRepresent NumclkThe individual data length writing write in the clock cycle；
Because the recognition capability of human eye is beyond 25ms, therefore in decoding with playing process, postpone 1 millisecond, for people
Observation for there is no any impact, as shown in figure 5, in order to reduce decoding thread with play complexity, reduction process
The computing cost of device, directly creates decoding thread using the API that Windows carries and plays thread, and using while (1) dimension
Hold the existence of thread, split thread cycle using sleep (1), it is to avoid system CPU is taken always.
Create receiving thread, order caching, decoding thread successively according to two steps above and play thread.For setting in advance
Each terminal being set to reception state opens up receiving port, and Surveillance center optionally receives and plays this according to emergent degree
Video.
Finally illustrate, preferred embodiment above only in order to technical scheme to be described and unrestricted, although logical
Cross above preferred embodiment the present invention to be described in detail, it is to be understood by those skilled in the art that can be
In form and various changes are made to it, without departing from claims of the present invention limited range in details.
Claims (7)
1. the wireless video transmission system based on TD-LTE emergency communication it is characterised in that：Including at least one mobile communication eventually
End, base station and Surveillance center；
Mobile communication terminal：For gathering video data, and the video data being gathered is compressed encoding, by TD-LTE
Cordless communication network is by the video data transmission after compressed encoding to base station；
Base station：For receiving the video data after the compressed encoding that mobile communication terminal transmits, by TD-LTE channel radio
Video data transmission after compressed encoding is made decoding process and is shown to the server of Surveillance center by communication network.
2. the wireless video transmission system based on TD-LTE emergency communication according to claim 1 it is characterised in that：Mobile
The video data of collection is compressed video data transmission after coding in UDP mode to base station communication terminal, then by base station
It is forwarded to Surveillance center.
3. the wireless video transmission system based on TD-LTE emergency communication according to claim 2 it is characterised in that：Mobile
One frame data are divided into several UDP subpackages to be stored in buffer area by communication terminal, then by UDP subpackage in order from video sending end
Mouth sends to base station, then is forwarded to Surveillance center by base station.
4. the wireless video transmission system based on TD-LTE emergency communication according to claim 3 it is characterised in that：Monitoring
The server at center is opened up port according to No. IP pre-setting and is received UDP subpackage, and the data receiving is stored in buffer area.
5. the wireless video transmission system based on TD-LTE emergency communication according to claim 2～4 any one, it is special
Levy and be：Each mobile communication terminal has the receiving thread corresponding with this mobile communication terminal, order caching and decoding
Play thread.
6. the wireless video transmission system based on TD-LTE emergency communication according to claim 1 it is characterised in that：Described
Mobile communication terminal has Big Dipper GPS dual-mode positioning function.
7. the wireless video transmission system based on TD-LTE emergency communication according to claim 4 it is characterised in that：Monitoring
The video data that the server at center receives is extracted from buffer area, is then passed through Ffmpeg video processing program by number
Decode and be converted to the form of stream according to bag, the vision storehouse eventually passing OpenCV is made video and shown.
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| CN114327325A (en) * | 2021-04-27 | 2022-04-12 | 北京仁光科技有限公司 | Multi-window processing method, system, readable storage medium and electronic device |
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