CN103248964A - Vehicle-mounted video transmission system based on Real Time Protocol (RTP)/RTCP (Real-time Transport Control Protocol) - Google Patents
Vehicle-mounted video transmission system based on Real Time Protocol (RTP)/RTCP (Real-time Transport Control Protocol) Download PDFInfo
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Abstract
A vehicle-mounted video transmission system based on an RTP/RTCP is characterized in that a network transmission control module and N movable clients form the whole vehicle-mounted video transmission system; a VANET (vehicular ad-hoc network) comprises each vehicle-mounted terminal; the clients are the vehicle-mounted terminals placed in a vehicle; an IntelIPP base is mounted at each vehicle-mounted terminal; and the vehicle-mounted video transmission system adopts a client/server mode. According to the vehicle-mounted video transmission system based on the RTP/RTCP, as the difference of video compression parameters can influence the final transmission quality, the video compression quality is adjusted in real time according to the packet loss rate detected by the system dynamically. The system can adjust the video transmission quality dynamically.
Description
Technical field
The present invention relates to the Video transmission system in a kind of onboard wireless network communications technology field.
Background technology
Along with the development of communications and transportation and information industry, use based on the various videos of vehicle network to get more and more people's extensive concerning.Vehicle safety DAS (Driver Assistant System), unmanned truck system, exceed sighting distance outer real-time road supervisory control system, real-time voice video communications system and multimedia recreation information sharing system etc. and ensuring traffic safety, improving traffic efficiency, enriching aspect such as people's life and have great importance.The structure of these systems all will relate to coding and the transmission of video on vehicle network essentially.Video technique has been realized the successful commercialization that video conference, video request program etc. are used in cable network and wireless network.How realizing in onboard wireless network service that video transmission and video smooth between car and the car are shared, is a focus in present onboard wireless network research field.
At first, vehicle network communication is extremely unstable.Object makes the vehicle self-organizing network characteristic of channel be different from the Ad hoc network of general static state or low rate motion to the complexity of high-speed mobile characteristic, road structure and the roadside environment of the reflection of signal, vehicle network etc.The internodal data transmission quality of vehicle self-organizing network depends on specific transmitting scene.In view of the in-and-out communication characteristic of vehicle self-organizing network, if will carry out real-time video communication, the video quality that obtains is inevitable to be changed along with channel.If the video quality of video compressing module output is better, when channel degenerates, channel congestion often takes place easily.Otherwise the video compression output video is second-rate, is adapted at the unstable or relatively poor situation of channel, but can't takes full advantage of the channel bandwidth resources of good time.
Secondly, frame of video also has its exclusive characteristic.The compression of video is unit with GOP.The GOP the inside has comprised different frame types: I frame, P frame and B frame.Lose loss that dissimilar frames brings and different.Losing of I frame can impact being correctly decoded in the whole GOP.What the I frame of losing for the reduction of trying one's best caused can't decode, and common solution is to reduce the length of GOP.Yet GOP length reduces, and the I frame increases, and the efficient of compression reduces, and the code check of generation can become greatly, causes the data quantitative change big.The data quantitative change is big, and corresponding UDP transmission package also increases, if run into situation such as network congestion, has increased number of dropped packets again potentially.Thereby the length of packet loss and GOP is " chicken-egg " antinomy.If, on one's own initiative code check or other compression parameters of GOP size and video are regulated as a parameter of weighing network transmission channel stability with packet loss, can be obtained the laser propagation effect of a relative ideal.
Below be the filling to part term in this specification:
Ad hoc network (can interim fast automatic networking to equation multi-hop mobile network)
GOP(Group Of Picture, the picture group, a GOP is exactly one group of continuous picture)
The abbreviation of UDP(User Datagram Protocol, do not belong to the connecting-type agreement, thereby it is little to have a resource consumption, the advantage that processing speed is fast, so it is more that audio frequency, video and general data are used UDP when transmitting usually, even because they lose packet once in a while one or two, can not have much impact to reception result yet.The main effect of udp protocol is the form that network traffic data is compressed into packet.）
Direct Show(DirectShow is a kind of open development environment, can customize the assembly of oneself as required)
VANET(Vehicular Ad-hoc NETwork, vehicle self-organizing network)
(" Intel Integrated Performance Primitives " is the cross-platform software function storehouse of a cover in Intel IPP storehouse, it provides multimedia function widely, for example audio decoder, image processing, signal processing, compress speech and encryption mechanism)
NS2(NS2 is a simulation software, can carry out the instrument of emulation to communication network protocol)
Above-mentioned term itself has been content well known in the art, thus related content should not regard as disclose insufficient.
Summary of the invention
The invention provides a kind of Vehicular video transmission system based on RTP/RTCP, by the packet loss that dynamically detects according to system, regulate the video compression quality in real time, system of the present invention can dynamically adjust video transmission quality.
For achieving the above object, systems technology scheme of the present invention is characterized by:
A kind of Vehicular video transmission system based on RTP/RTCP, it is characterized in that, be to be built into the whole Vehicular video transmission system of the present invention jointly by network transmission control module and some N transportable client, each car-mounted terminal forms the VANET network, described client is for being placed in the car-mounted terminal in the car, each car-mounted terminal is equipped with Intel IPP storehouse, and described Vehicular video transmission system is Client.Each car-mounted terminal comprises 5 function sub-modules altogether, they are video acquisition module, the coding and decoding video module, message processing module, the video playback module, file storage module, these function sub-modules all are structured on the described Intel IPP storehouse, wherein: described video acquisition module is used for the collection of video data, obtain the video initial data from the transducer hardware device, perhaps from acquisition video initial data such as file video flowings, video acquisition module respectively with the video playback module, video encoding module connects, and is used for the preceding coding compression of local display video file or transmission;
Described coding and decoding video module is used for reducing the transmitting video data redundancy;
Described message processing module is for finishing preliminary treatment and the video compression computing to the video acquisition module data;
Described video playback module is connected with the video decode module with video acquisition module respectively, is used for playing the video data data that show local collection or the decoded video data of other mobile car-mounted terminal that comes from the transmission of VANET network;
Described file storage module is used for the local video data of gathering of storage and from the next video data of the reception of other car-mounted terminals, is used further to send transmitting video files to other receiving terminals.
Network transmission control module of the present invention is structured on the VANET, and the network transmission control module is used for the video data transmission between removable car-mounted terminal and the car-mounted terminal.This network transmission control module comprises dynamic adjustment video transmission quality algorithm software module, be characterized by: this software module is based on network packet loss rate and the video sequence complexity is dynamically adjusted video transmission quality, the video quality of assessment video after transmitting through the vehicle network of simulating out, video sequence at different complexities quantizes parameter q p, code check bitrate, packet error rate test to factor GOP, the compression that influences video transmission quality, draws the optimal parameter combination.
Described dynamic adjustment video transmission quality algorithm software module, the method for its enforcement may further comprise the steps,
At first, the obtaining step of network packet loss rate is used for obtaining the current network packet loss;
Then, video sequence complexity determining step is for the motion severe degree of distinguishing video sequence;
At last, dynamically adjust the quality step, be used for according to network packet loss rate, network quality is divided into Three Estate: good, poor, very poor, the coding this frame before, if network quality from a state variation to another state, according to the sequence of video, adjust coding parameter, to meet the optimal compression parameter under this network condition.
The present invention is by the Vehicular video transmission system of design based on RTP/RTCP, consider that video compression parameter difference can be influential to final transmission quality, dynamically the packet loss that detects according to system is regulated the video compression quality in real time, reaches the purpose that final transmission quality promotes.Innovative point and beneficial effect:
(1) complete vehicle network video transmission plan and system have been designed.Take full advantage of H.264 outstanding compression performance and the dual core processor powerful computing ability of encoder, realized functions such as onboard system video acquisition, coding, decoding, transmission.
(2) according to the packet loss of vehicle network, at different network condition, provide the compression parameters configuration of optimization, and can the dynamic adjustments video transmission quality.Can't take full advantage of the excessive drawbacks such as network congestion that cause of bandwidth or data volume when effectively having overcome the dynamic change of single compressed parameter lower network.
Description of drawings
Fig. 1 is the theory diagram of the whole Vehicular video transmission system of the present invention.
Fig. 2 is protocol stack level figure of the present invention.
Fig. 3 video acquisition flow chart.
Fig. 4 coding module flow chart.
Fig. 5 decoder module flow chart.
The structural representation of Fig. 6 car-mounted terminal hardware components EC5-1719CLDNA development board and external interface.
Fig. 7 is software section car-mounted terminal data flow schematic diagram of the present invention.
Fig. 8 is the video transmission link.
Fig. 9 is adaptive video quality algorithm flow process.
Embodiment
Below in conjunction with accompanying drawing technical solution of the present invention is described further.
As shown in Figure 1, network transmission control module and some N transportable client has been built into the whole Vehicular video transmission system of the present invention jointly, each car-mounted terminal forms the VANET network, described client is the car-mounted terminal that is placed in the car, described each car-mounted terminal is equipped with Intel IPP storehouse, and described Vehicular video transmission system is Client.Each car-mounted terminal comprises 5 function sub-modules altogether, they are video acquisition module, the coding and decoding video module, message processing module, the video playback module, file storage module, these function sub-modules all are structured on the described Intel IPP storehouse, wherein: described video acquisition module is used for the collection of video data, obtain the video initial data from the transducer hardware device, perhaps from acquisition video initial data such as file video flowings, video acquisition module respectively with the video playback module, video encoding module connects, and is used for the preceding coding compression of local display video file or transmission.Collecting flowchart is developed by DirectShow as shown in Figure 3, and the realization of video acquisition is not that technical solution of the present invention is to the contribution part of prior art.
Described coding and decoding video module is used for reducing the transmitting video data redundancy, and is excessive to solve the video data volume, the problem that the VANET network bandwidth can't satisfy.The coding and decoding video module construction comprises two parts of coding module and decoder module on Intel IPP storehouse.
The basic procedure of coding module work is shown in 4.Developing instrument IPP and UMC that video encoding module provides based on Intel company.The data cached compression of H.264 encoding in the data queue that Sample Grabber is collected is to be fit to the limited VANET network bandwidth at present.
The decoder module flow process as shown in Figure 5.After the user receives frame data from the VANET network, extract the information such as size, color format, encoder type of image, initialization decoding environment calls decoding functions, just can obtain decoded frame, the Video Renderer that provides by UMC plays image for the video playback module at last.
More than coding, decode procedure all are to belong to prior art, and encoding and decoding technique itself is not that technical solution of the present invention is to the contribution part of prior art.
Described message processing module is for finishing preliminary treatment and the video compression computing to the video acquisition module data.
Described video playback module is connected with the video decode module with video acquisition module respectively, is used for playing the video data data that show local collection or the decoded video data of the other side's (other) mobile car-mounted terminal that comes from the transmission of VANET network.
Described file storage module is used for the local video data of gathering of storage and from the next video data of the reception of the other side's (other) car-mounted terminal, is used further to send transmitting video files to other receiving terminals.
Described network transmission control module is structured on the VANET, and the network transmission control module is used for the video data transmission between removable car-mounted terminal and the car-mounted terminal, supports clean culture, multicast pattern.The transport layer of network transmission control module has adopted RTP/RTCP real-time Transmission and control protocol to be implemented in the data feedback on two kinds of transmission modes of VANET network and has controlled.The video transfer function of this module adopts RTP Multicasting multicast to have the root model to realize.All clients add identical multicast address, bind identical local udp port A to be used for receiving multicast data.Server end (being some car-mounted terminals) binding another one port numbers B is used for and all clients are carried out exchanges data.Work as customer end A like this and send data to server end slogan B, server receives the back and sends to multicast address and port A, and all like this clients can both receive the video data that customer end A transmits.
In addition, described network transmission control module comprises dynamic adjustment video transmission quality algorithm software module, be characterized by: this software module is based on network packet loss rate and the video sequence complexity is dynamically adjusted video transmission quality, the video quality of assessment video after transmitting through the vehicle network of simulating out, video sequence at different complexities quantizes parameter q p, code check bitrate, packet error rate test to factor GOP, the compression that influences video transmission quality, draws the optimal parameter combination.
The method that this software module is implemented is characterized in that, may further comprise the steps,
At first, the obtaining step of network packet loss rate is used for obtaining the current network packet loss;
Then, video sequence complexity determining step is for the motion severe degree of distinguishing video sequence;
At last, dynamically adjust the quality step, be used for according to network packet loss rate, network quality is divided into Three Estate: good, poor, very poor, the coding this frame before, if network quality from a state variation to another state, according to the sequence of video, adjust coding parameter, to meet the optimal compression parameter under this network condition.
Below provide specific embodiment and further introduce technical solution of the present invention.
The Vehicular video transmission system performing step that the present invention is based on RTP/RTCP is as follows:
(1) car-mounted terminal hardware architecture
Each car-mounted terminal should have stronger disposal ability, with the processing of the sensing data that satisfies video compression computing and video acquisition module.Present embodiment is selected for use by grinding the EC5-1719CLDNA development board that auspicious company produces, EC5-1719CLDNA is the high-performance single-borad computer of a employing Intel notebook computer chipset 945GM design, processor is Intel Core 2 Duo, adopts bandwidth to reach the direct media interface DMI of 10Gb/s between the bridge of north and south.Its characteristics are high-performance, low-power consumption and expansion card rich interface.Based on this development board, equipment such as internal memory, storage, demonstration LCD, touch-screen, camera, wireless network card, microphone can also have been expanded as required, as shown in Figure 6.
Video acquisition module is obtained video data from hardware device, these hardware devices comprise capture card, tv receiver card, camera, video tape recorder etc.
(2) vehicle terminal software framework
Car-mounted terminal belongs to common C/S framework, that is: be made up of video sending end and video receiver two parts.Different is, each car-mounted terminal node of the present invention belongs to peer node, both can be used as the video transmit leg, also can be used as the recipient of video, the existing module of each vehicle-mounted terminal system is come by the first-class collection video of shooting, encoded video, it is to accept the real-time video that the other side's car-mounted terminal transmits that module (thread) is also arranged, and plays it.Car-mounted terminal can be divided into video acquisition module, video encoding module, network transmission control module, video decode module, video playback module, as shown in Figure 7 according to function.
The present invention adopts Direct Show to realize video acquisition.
The network transmission control module is structured on the VANET.The transport layer of network transmission control module has adopted RTP/RTCP real-time Transmission and control protocol to be implemented in the data feedback on two kinds of modes of VANET network and has controlled.
The coding and decoding video module construction is on Intel IPP storehouse, and the video Code And Decode can be realized based on this encoding and decoding storehouse of IPP of Intel.
The video transmission of whole car-mounted terminal can be formed link as shown in Figure 8 according to the flow direction of video data and the technology that adopts.
The present invention is based on network packet loss rate and video sequence complexity, dynamically to adjust the method step of video transmission quality as follows:
(1) emulation platform building and parameter combinations are obtained
On the basis of NS2 and these two instruments of Evalvid, at H.264 encoder expansion of Intel IPP, the video quality of assessment video after transmitting through the vehicle network of simulating out.Adopt the Gilbert-Elliott error model to simulate the vehicle network channel error.Video sequence at different complexities quantizes parameter q p, code check bitrate, packet error rate test to factor GOP, the compression that influences video transmission quality, draws the optimal parameter combination.
(2) adaptive video quality algorithm flow process
1) network channel is divided into three types: GOOD, BAD, WORSE.
When packet loss is lower than 1%, the definition channel status is GOOD;
When packet loss greater than 1%, less than 10%, the definition channel status is BAD;
When packet loss greater than 10%, the definition channel status is WORSE.
The channel conditions of vehicle network constantly switches between these three kinds of channel types along with the variation of environment.
2) at set intervals
, calculate packet loss.
If the channel packet loss is lower than 1%, by three kinds of sequence complexities, provide the high-quality video parameter combinations, as table 1;
If packet loss satisfy [1%-10%), by three kinds of sequence complexities, provide IPPPP sequence, GOP=5 is as table 2;
Suppose that packet loss reaches 10% even higher, show vehicle because distance factor such as excessive has perhaps arrived certain road dead angle, channel is impaired.Therefore, adopt the GOP combination of IBBBP this moment, as table 3, reduce code check simultaneously, at this moment, can not influence the decoding of the frame of transmission success behind all B frame packet losses, several combinations than the front, comprehensive video quality can promote to some extent.
Three kinds of parameter group of reference are closed respectively as table 1,2,3.Detailed algorithm flow such as Fig. 9.
Table 1 packet loss is less than 1% video compression parameter combinations
The video compression parameter combinations of table 2 packet loss 1%-10%
Table 3 packet loss is greater than 10% video compression parameter combinations
Claims (1)
1. Vehicular video transmission system based on RTP/RTCP, it is characterized in that, be to be built into the whole Vehicular video transmission system of the present invention jointly by network transmission control module and some N transportable client, each car-mounted terminal forms the VANET network, described client is the car-mounted terminal that is placed in the car, each car-mounted terminal is equipped with Intel IPP storehouse, and described Vehicular video transmission system is Client;
Each car-mounted terminal comprises 5 function sub-modules altogether, they are video acquisition module, the coding and decoding video module, message processing module, the video playback module, file storage module, these function sub-modules all are structured on the described Intel IPP storehouse, wherein: described video acquisition module is used for the collection of video data, obtain the video initial data from the transducer hardware device, perhaps from acquisition video initial data such as file video flowings, video acquisition module respectively with the video playback module, video encoding module connects, and is used for the preceding coding compression of local display video file or transmission;
Described coding and decoding video module is used for reducing the transmitting video data redundancy;
Described message processing module is for finishing preliminary treatment and the video compression computing to the video acquisition module data;
Described video playback module is connected with the video decode module with video acquisition module respectively, is used for playing the video data data that show local collection or the decoded video data of other mobile car-mounted terminal that comes from the transmission of VANET network;
Described file storage module is used for the local video data of gathering of storage and from the next video data of the reception of other car-mounted terminals, is used further to send transmitting video files to other receiving terminals;
Described network transmission control module is structured on the VANET, and the network transmission control module is used for the video data transmission between removable car-mounted terminal and the car-mounted terminal; This network transmission control module comprises dynamic adjustment video transmission quality algorithm software module, be characterized by: this software module is based on network packet loss rate and the video sequence complexity is dynamically adjusted video transmission quality, the video quality of assessment video after transmitting through the vehicle network of simulating out, video sequence at different complexities quantizes parameter q p, code check bitrate, packet error rate test to factor GOP, the compression that influences video transmission quality, draws the optimal parameter combination;
Described dynamic adjustment video transmission quality algorithm software module, the method for its enforcement may further comprise the steps,
At first, the obtaining step of network packet loss rate is used for obtaining the current network packet loss;
Then, video sequence complexity determining step is for the motion severe degree of distinguishing video sequence;
At last, dynamically adjust the quality step, be used for according to network packet loss rate, network quality is divided into Three Estate: good, poor, very poor, the coding this frame before, if network quality from a state variation to another state, according to the sequence of video, adjust coding parameter, to meet the optimal compression parameter under this network condition.
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