CN101330609A - Method and system for multi-path wireless video transmission - Google Patents
Method and system for multi-path wireless video transmission Download PDFInfo
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- CN101330609A CN101330609A CN 200810020904 CN200810020904A CN101330609A CN 101330609 A CN101330609 A CN 101330609A CN 200810020904 CN200810020904 CN 200810020904 CN 200810020904 A CN200810020904 A CN 200810020904A CN 101330609 A CN101330609 A CN 101330609A
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Abstract
The invention relates to a multi-path wireless video transmission method. A wireless video transmission system is composed of a wireless video terminal, a video release server and various clients, and the wireless video terminal serves the functions of video acquisition, video compression and wireless transmission. Firstly, the video signals acquired by a camera are compressed and encoded by the wireless video terminal to form a video stream. The video release server re-establishes the received multi-path video stream, processes the error concealment of the video, manages the client information, and provides a client logging on the server with the corresponding video services. The client receives a command of a user to fulfil the control function of the wireless video terminal and the decoding display function of the video stream. Considering the requirements for the computational power and the immediacy of a movable termination, the system adopts the H.264 protocol in the encoder, and two buffers are respectively established at the sending terminal and the receiving terminal for caching the two-way signals. The video stream is encoded by the encoder after merging and the corresponding error concealment method is adopted in the encoder.
Description
One, technical field;
The invention belongs to the communication network technology field, more specifically, relate to the method and system of the realization multiplex (MUX) wireless video transmission in the public mobile communication network environment
Two, background technology
Along with mobile communication and Development of Multimedia Technology, more and more be subjected to people's attention based on the video transmission of mobile radio network, at visual telephone, video conference and field of video monitoring systems are used widely.The common feature of mobile radio network is that bandwidth relative narrower and fluctuation are bigger, error rate height, propagation delay time is big, packet loss is big, and the wireless real-time video transmission requires transmission network to have high-transmission bandwidth, high reliability and low time delay etc., therefore, and under wireless communications environment, make up the real-time radio Video transmission system video flowing with the assurance of certain QoS service quality is provided, be faced with many difficulties and challenge.
At present, China has successively set up GSM, GPRS, CDMA-1X and EDGE network, and back three's network theory peak bandwidth can reach 171.2Kbps respectively, 307.2kbps and 473.6Kbps.But the actual transmission bandwidth and the theoretical peak of mobile radio network have a long way to go, and the EDGE network actual measurement that transmission bandwidth is the highest can only reach the uplink speed about 80K, far can not satisfy the requirement of high-quality real-time video transmission.Therefore, existing wireless video transmission plan based on public mobile communications network generally adopts single channel GPRS or CDMA1X channel to transmit, and influenced by the channel limiting bandwidth, is difficult to reach high-quality real time video image.
Three, summary of the invention
The objective of the invention is on the public mobile communication network of limiting bandwidth and high bit-error, to obtain high-quality real-time video transmission, disclose a kind of wireless video transmission method and system based on two-way EDGE channel.The present invention is with the high performance DSP wireless video terminal that has been core design; Utilize two-way enhanced data rates for GSM evolution (EDGE, Enhanced Data rate for GSM Evolution) transmission channel that higher transmission bandwidth is provided, proposed based on the transmit mechanism of two-way buffering area judgement and the error concealing method of two-way transmission.
Technical scheme of the present invention is: the multi-path wireless video transmission method, form wireless video transmission system by wireless video terminal, video distribution server and polytype client; Wireless video terminal has video acquisition, video compression and wireless transmission; Wireless video terminal at first carries out compressed encoding to the vision signal of camera acquisition and forms video flowing, adopts the multiple judgment mechanism that send buffering area then, and the compressed video multichannel EDGE channel of flowing through is sent to the online video distribution server of INETERNET.The video distribution server is responsible for rebuilding the multi-path video stream of reception, the error concealment process of video and the information of administrative client, provides corresponding Video service to the client that signs in to server; Client receives user's instruction and finishes the controlled function of wireless video terminal and the decoding and displaying function of video flowing.For the selection of encoder, consider the requirement of the computing capability and the real-time of portable terminal, H.264 basic class (Baseline Profile) encoder can be selected by system.Transmitting terminal and receiving terminal are respectively opened up 2 buffering areas the two-way signal are carried out buffer memory.Sending controling unit is judged according to the detection of two-way buffering area, and the code stream that has encoded is sent control, sends strategy according to two-way and distributes video data to flow to corresponding transmission buffering area, sends through two-way EDGE channel then.Receiving terminal merges the two-way buffer data, the losing of judgment data bag, and mark obliterated data scope and type.Code stream after the merging send by decoder decode, according to the characteristics and the frame losing type of two-way transmission, adopts corresponding error conceal method in decoder.
Two-way wireless video transmission system framework as shown in Figure 1.System is made up of wireless video terminal, video distribution server and polytype client.Wherein, wireless video terminal has functions such as video acquisition, video compression and wireless transmission.Wireless video terminal at first carries out compressed encoding to the vision signal of camera acquisition and forms video flowing, adopts the multiple judgment mechanism that send buffering area then, and the compressed video multichannel EDGE channel of flowing through is sent to the online video distribution server of INETERNET.The video distribution server is responsible for rebuilding the multi-path video stream of reception, the error concealment process of video and the information of administrative client, provides corresponding Video service to the client that signs in to server.Client receives user's instruction and finishes the controlled function of wireless video terminal and the decoding and displaying function of video flowing.
The system handles flow process mainly comprises four processing units as shown in Figure 2: cell encoder, sending controling unit, data merge cells, and decoding and error concealment unit.
For the selection of encoder, consider the requirement of the computing capability and the real-time of portable terminal, H.264 basic class (Baseline Profile) encoder can be selected by system.Transmitting terminal and receiving terminal are respectively opened up 2 buffering areas the two-way signal are carried out buffer memory.Sending controling unit is judged according to the detection of two-way buffering area, and the code stream that has encoded is sent control, sends strategy according to two-way and distributes video data to flow to corresponding transmission buffering area, sends through two-way EDGE channel then.
Receiving terminal merges the two-way buffer data, the losing of judgment data bag, and mark obliterated data scope and type.Code stream after the merging send by decoder decode, according to the characteristics and the frame losing type of two-way transmission, adopts corresponding error conceal method in decoder.
(b) the transmission strategy of judging based on the two-way buffering area
H.264 basic class is supported I frame and P frame.The I frame adopts the frame mode coding, and code efficiency is lower but need not reference frame, can independently recover all images information and can effectively stop the error diffusion that causes owing to packet loss.The P frame adopts coded in inter mode, utilizes inter prediction and motion compensation to eliminate the time domain redundancy, only transmits the difference of present frame and reference frame, the code efficiency height, but need reference frame and the diffusion that makes the mistake easily.
At the characteristics of I frame and P frame, take difference as shown in Figure 3 to send strategy.Wherein, the I frame is the key frame in the code stream H.264, the method for taking two-way to repeat to send.Take the alternately strategy of transmission of two-way for the P frame.The P frame by odd even at interval average distribute to the two-way channel.
System is that 2 sending modules are respectively opened up a transmission buffering area, the corresponding wireless sending module of each buffering area.In two-way channel data process of transmitting, the unsteadiness of wireless channel will certainly cause the fluctuation that sends buffering area, therefore need monitor at the remaining space situation that two-way sends buffering area, and then judge and select corresponding transmission control.
If W
AWith W
BRepresent two-way buffering area remaining space respectively, its formula definition is as follows:
W
A＝Buffer_A-(P_WR_A-P_RD_A)
W
B＝Buffer_B-(P_WR_B-P_RD_B)
Wherein, Buffer_A and Buffer_B represent the two-way buffer size respectively, and P_WR_A, P_RD_A and P_WR_B, P_RD_B are respectively two-way buffer area read-write pointer.The buffer area read-write pointer originates in same position, and when the read-write pointer was identical, the expression buffering area was empty.The difference of read-write pointer is buffering area and takes up room.
According to the remaining space of buffering area, be divided into 4 kinds of states:
S1:(W
A＞current frame length and W
B＞current frame length) be that the two-way space all has enough spatial caches.
S2:(W
A＞current frame length and W
B＜current frame length) be that A path buffer space is enough, but the B path spacing is not enough.
S3:(W
A＜current frame length and W
B＞current frame length) be that B path buffer space is enough, but the A path spacing is not enough.
S4:(W
A＜current frame length and W
B＜current frame length) be that the two-way buffering area does not all have enough spaces.
After the each coding of system is finished a frame, directly do not send to buffering area and send, but judge the present frame type in advance and send buffer state, select corresponding transmit mechanism then:
The S1:I frame takes two-way to repeat to send; The P frame sends according to path sign single channel, subsequently the path sign is revised as another road.
S2: for the I frame, carry out the A road and send, before the next frame digital coding is finished, keep B road buffer state is detected,, then carry out the B road and send if enough between the buffer empty of B road.For the P frame, carry out the A road and send, and the path sign is revised as B.
S3: with the S2 state processing roughly the same.
S4: the system start-up error counter, initiatively abandon for follow-up P frame, do not enter the transmission process, arrive until next I frame.The I frame number that the error counter counting does not send is continuously then sent system error signal if surpass 3, the prompting channel block.During the counting, if state exchange then empties error counter.
(c) receive and the error concealment processing
Receiving terminal is at first to the merging of sorting of the data of correct reception.For the I frame that two-way repeats to send, receiving terminal is chosen a circuit-switched data of correct reception, initiatively abandons another circuit-switched data.Himself sets a timer, does not think this packet loss if receive corresponding Bao Ze in the stipulated time.Because the unreliability of wireless channel, receiving terminal also needs to carry out certain error concealment, and at the characteristics that two-way sends, the I frame adopts different error conceal methods with the P frame, as shown in Figure 4.The I frame adopt neighborhood pixels linear interpolation algorithm to carry out error concealment and the P frame adopt before frame method of substitution and bi-directional predicted penalty method carry out error concealment.
● the I hiding frames error
System adopts the two-way channel redundancy to send crucial I frame at transmitting terminal, and purpose is to reduce as much as possible the error probability of I frame.In case I frame loading error occurring, decoding end will adopt neighborhood pixels linear interpolation algorithm to carry out error concealment.As shown in Figure 5, by getting weighted average and replace losing macro block losing macro block surrounding pixel value, the distance of weights and interpolating pixel and reference pixel is inversely proportional to.
Fig. 5 neighborhood pixels linear interpolation schematic diagram
For lose in the macro block N arbitrarily pixel g (x, y), its pixel value is determined by following formula:
g(x，y)＝[(N-dx)·(N-dy)·d
L(x，y)+(N-dx)·dy·b
B(x，y)
+dx·(N-dy)·b
T(x，y)+dx·dy·b
R(x，y)]/(2N)
Dx wherein, dy, N-dx, N-dy are respectively g, and (x is y) to b
L(x, y), b
T(x, y), b
R(x, y), b
B(N is the size of macro block for x, distance y).
● the P hiding frames error
The P frame adopts interframe encode to eliminate time redundancy, code efficiency height.The data volume of one two field picture is often less than a basic network transmission unit, in this case, when data-bag lost occurring in the Network Transmission, then often cause losing of whole two field picture content, so native system considers it is the error concealment processing of whole LOF for the error concealment of P frame.The simplest whole frame error concealment method is exactly preceding frame method of substitution, and preceding frame method of substitution can be obtained error concealing effect preferably to static relatively video sequence, but can produce bigger distortion to the video sequence of motion.Consider that the P frame is that two-way alternately sends in the native system, can avoid successive frame to make mistakes more effectively, therefore, when discontinuous the makeing mistakes of the P of receiving terminal frame, then adopt the method for bi-directional predicted compensation; Make mistakes frame method of substitution before then adopting continuously for the P frame.
As shown in Figure 6, for P
N+2, P
N+3Frame, owing to continuous frame losing mistake occurred, so the method that frame substitutes before taking, experiment shows that this situation is less.For P
nFrame adopts the method for bi-directional predicted compensation.
If P
N-1Frame is with reference to P
N-2Frame and P
N+1Frame is with reference to P
nThe motion vector set of frame is respectively: { MV
N-1| P
N-1→ P
N-2, { MV
N+1| P
N+1→ P
n.If M
N-1, iBe P
N-1In i macro block, its motion vector is MV
N-1, iAccording to object of which movement linear theory, then P
nIn the macro block M of same position
N, iForward prediction motion vector MV
N, i 1∈ { MV
n 1| P
n→ P
N-1Be:
D wherein
N-1, D
nRepresent P respectively
N-2With P
N-1, P
N-1With P
nBetween time gap.In like manner, M
N, iBack forecast motion vector MV
N, i 2∈ { MV
n 2| P
n→ P
N-1Be:
According to (1) (2) two formulas, just can obtain two predicted macroblock M respectively by motion compensation
N, i 1, M
N, i 2, and finally covered macro block after the weighted average
The present invention is that beneficial effect is: proposed a kind of wireless video transmission method and system based on two-way EDGE channel, obtain higher transmission bandwidth by two-way EDGE, the transmit mechanism that transmitting terminal adopts the two-way buffering area to judge, receiving terminal adopts corresponding merging and error concealing method, obtains high-quality real-time video transmission on the public mobile communication network of finite bandwidth and high bit-error.
Four, description of drawings
Fig. 1 wireless video transmission system frame diagram of the present invention
Fig. 2 wireless video transmission system process flow block diagram
Fig. 3 two-way channel sends tactful schematic diagram
Fig. 4 receiving terminal error concealment process schematic diagram
Fig. 5 neighborhood pixels linear interpolation schematic diagram
Fig. 6 P frame error concealment schematic diagram
Fig. 7 wireless terminal hardware block diagram
Five, specialize execution mode
Wireless video terminal is the core of two-way wireless video transmission system, as shown in Figure 6, can select for use dedicated digital signal processor TMS320DM642 as core cell.Peripheral functional modules also comprises the audio/video decoding unit, clock unit, SDRAM, Flash, UART control, wireless EDGE module etc.The TMS320DM642 clock is up to 600MHz, and disposal ability reaches 4800MIPS, has 3 video ports (VP0-VP3), supports multiple resolution and standard.Can be directly and outside SDRAM by external memory interface (EMIF) control unit, FLASH connects, and can expand and realize ATA hard-disk interface, UART interface and digital I interface etc.
Wireless video terminal adopts the VP0 port to link to each other with video decoding chip (A/D) and realizes video acquisition, and configuration EMIF port is 2 road UART interfaces, and links to each other with the EDGE wireless transport module by the serial port drive chip, realizes the two-way wireless data transmission.
Adopt error conceal method in decoder: the error concealing of decoder, according to the characteristics and the frame losing type of two-way transmission: the I frame adopts different error conceal methods respectively with the P frame.The I frame adopts the neighborhood pixels linear interpolation to carry out error concealment; And the error concealing method of P frame also will further segment, and when discontinuous the makeing mistakes of the P of receiving terminal frame, then adopts the method for bi-directional predicted compensation; Make mistakes frame method of substitution before then adopting continuously for the P frame.
Claims (2)
1, multi-path wireless video transmission method is characterized in that being provided with wireless video terminal, video distribution server and polytype client and forms wireless video transmission system; Wireless video terminal has video acquisition, video compression and wireless transmission; Wireless video terminal at first carries out compressed encoding to the vision signal of camera acquisition and forms video flowing, adopts the multiple judgment mechanism that send buffering area then, and the compressed video multichannel EDGE channel of flowing through is sent to the online video distribution server of INETERNET; The video distribution server is rebuild multi-path video stream, the error concealment process of video and the information of administrative client that receives, and provides corresponding Video service to the client that signs in to server; Client receives user's instruction and finishes the controlled function of wireless video terminal and the decoding and displaying function of video flowing.For the selection of encoder, consider the requirement of the computing capability and the real-time of portable terminal, system adopts H.264 basic class encoder; Transmitting terminal and receiving terminal are respectively opened up 2 buffering areas the two-way signal are carried out buffer memory; Sending controling unit is judged according to the detection of two-way buffering area, and the code stream that has encoded is sent control, sends strategy according to two-way and distributes video data to flow to corresponding transmission buffering area, sends through two-way EDGE channel then.Receiving terminal merges the two-way buffer data, the losing of judgment data bag, and mark obliterated data scope and type.Code stream after the merging send by decoder decode, according to the characteristics and the frame losing type of two-way transmission, adopts corresponding error conceal method in decoder.
2, multi-path wireless video transmission method according to claim 1, it is characterized in that in decoder, adopting error conceal method: the error concealing of decoder, according to the characteristics and the frame losing type of two-way transmission: the I frame adopts different error conceal methods respectively with the P frame; The I frame adopts the neighborhood pixels linear interpolation to carry out error concealment; And the error concealing method of P frame also will further segment, and when discontinuous the makeing mistakes of the P of receiving terminal frame, then adopts the method for bi-directional predicted compensation; Make mistakes frame method of substitution before then adopting continuously for the P frame.
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|---|---|
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