CN1917618A - Method of transmitting video data, and transmission system - Google Patents
Method of transmitting video data, and transmission system Download PDFInfo
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- CN1917618A CN1917618A CN 200510090881 CN200510090881A CN1917618A CN 1917618 A CN1917618 A CN 1917618A CN 200510090881 CN200510090881 CN 200510090881 CN 200510090881 A CN200510090881 A CN 200510090881A CN 1917618 A CN1917618 A CN 1917618A
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Abstract
The method is designed for use in a video communication system comprising video signal send end, relay server and receiving end. The relay server buffers the video frames from the sending end; when receiving each request message, the relay server sends the first one of received video frames to the receiving end. The invention also reveals a video signal transmission system. The invention can avoid the congestion at air interface of mobile network due to insufficient bandwidth.
Description
Technical field
The present invention relates to the multimedia communication technology field, relate in particular to a kind of method of transmitting video data and transmission system thereof.
Background technology
At present, utilize the picture pick-up device (as camera) on the PC terminal to realize video communication between the PC terminal use based on computer network, making communicating pair can carry out visual interchange has become one of basic service that existing instant communication software can provide.But flourish along with mobile communication technology, the particularly proposition of 3G technology, the disposal ability of portable terminal and mobile network's transmission bandwidth all are greatly improved, thereby make between PC terminal and the portable terminal and carry out the real-time visual video communication between portable terminal and the portable terminal and become possibility, based on portable terminal incomparable flexibility and portability, realized carrying out anywhere or anytime the target of visual video communication thus.
Please refer to Fig. 1, this figure is that the system that realizes visual video communication in the prior art between PC terminal and the portable terminal forms topological diagram, wherein:
The effect of terminal is collection and the playback that is used to finish video data, and tasks such as video data encoding and decoding processing and video Data Transmission processing, comprise PC terminal 10 and portable terminal 20, (this camera 201 can be built in portable terminal 20 inside to the camera 201 of portable terminal 20 uses self, also can be placed on portable terminal 20) carry out the collection of video data, and with the coding video data transmission of gathering, the video data that PC terminal 10 is sent carries out the decoding and displaying processing simultaneously; PC terminal 10 uses the camera 101 of self to carry out the collection of video data, and the coding video data of gathering is sent, and the video data that portable terminal 20 is sent carries out the decoding and displaying processing simultaneously;
At present, carrying out in the video Data Transmission process based on above-mentioned video communication system, particularly when the recipient is portable terminal, usually can there are the following problems:
Because the restriction of mobile network's air interface transmission bandwidth, make at a plurality of transmit legs simultaneously when a recipient sends Frame, may cause recipient's transmission data to produce the phenomenon of blocking up owing to the restriction of air interface transmission bandwidth, thereby may have influence on the stability and the real-time of video communication.
Simultaneously, in existing mobile communications network, realize in the video communication process, portable terminal generally all is to adopt (the MPEG of Motion Picture Experts Group, Moving Picture Experts Group) the encoding and decoding agreement comes video data carried out that encoding and decoding handle, because the encoding-decoding process of MPEG encoding and decoding agreement regulation is comparatively complicated, and the more disposal ability resource of encoding and decoding processing procedure meeting occupied terminal of using the MPEG agreement to realize, so these characteristics of MPEG agreement are not to be well suited for portable terminal the encoding and decoding of video data are handled in fact.
In addition, in the video communication process between the computer network realization PC terminal, generally can adopt RTP (RTP now, Real-Time Transport Protocol) and RTCP Real-time Transport Control Protocol (RTCP, Real-time Transport Control Protocol) carries out the transmitting video data frame, but because the RTP/RTCP agreement generally relatively is applicable to video communication in the computer network, for mobile network system and not exclusively suitable.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of method of transmitting video data and transmission system thereof, so that at portable terminal during as the video data recipient, can avoid having improved the real-time and the stability of video communication owing to the unstable jam that causes of mobile network's empty port load-supporting bandwidth.
For addressing the above problem, the technical scheme that the present invention proposes is as follows:
A kind of method of transmitting video data is applied in the video communication system that comprises video data transmission side, transfer server and video data recipient, comprises step:
A. described transfer server carries out buffer memory to the video data frame that described transmit leg is sent respectively;
B. transfer server sends to the recipient with a video data frame that receives at first in the video data frame of current cache at every turn when receiving the request message that described recipient sends.
Preferably, described steps A specifically comprises step:
A1. set in advance the one-period rule;
A2. described transmit leg at point each of described periods rules regulation, sends a video data frame to transfer server respectively cycle time;
A3. transfer server carries out buffer memory to each video data frame that receives respectively.
Preferably, described transmit leg transmission video data frame specifically comprises step to the process of transfer server:
A1. described transmit leg sends a complete video data frame to transfer server from first video data frame every the N frame; And
A2. respectively remaining video data frame is sent to transfer server with default frame head form.
Preferably, described transmit leg transmission video data frame specifically comprises step to the process of transfer server:
A11. described transmit leg sends a complete video data frame to transfer server from first video data frame at each predetermined distance time point; And
A12. the video data frame with all the other times sends to transfer server with default frame head form respectively.
Preferably, also comprise step:
C. described recipient is saved in this locality with the frame head data of the complete video Frame of this reception when for the first time receiving the complete video Frame that transfer server sends; And
D. the frame head data of preserving according to this locality is carried out decoding processing to the video data frame of the default frame head of follow-up reception;
E. described recipient uses the frame head data of this complete video Frame that receives to upgrade local last frame head data of preserving when receiving the complete video Frame that transfer server sends next time, returns step D then.
Preferably, the recipient is used to ask transfer server to send the request message of next video data frame to the transfer server transmission before the current video data frame of sending carries out decoding processing to transfer server.
Preferably, described transmit leg is portable terminal or PC terminal; Described recipient is a portable terminal.
Preferably, when described transmit leg was portable terminal, described transmit leg used joint photographic experts group JPEG agreement that video data is carried out encoding and decoding and handles; And
When described recipient was portable terminal, described recipient used joint photographic experts group JPEG agreement that video data is carried out encoding and decoding and handles.
Preferably, described video communication system adopts ICP/IP protocol or udp protocol that video data frame is transmitted.
Accordingly, the invention allows for a kind of video-frequency data transmission system, comprise video data transmission side, transfer server and video data recipient, described transfer server comprises:
Buffer unit, the video data frame that is used for respectively described transmit leg being sent carries out buffer memory;
The Frame extraction unit is used for when receiving the request message that described recipient sends at every turn, extracts a video data frame that receives at first in the video data frame of described buffer unit current cache;
First transmitting element, each video data frame that is used for respectively described Frame extraction unit being extracted sends to the recipient.
Preferably, described transmit leg specifically comprises:
The cycle trigger element is used for storing in advance the one-period rule, when putting each cycle time that arrives described periods rules regulation, generates a triggering signal;
Second transmitting element is used for respectively sending a video data frame to transfer server when described cycle trigger element is sent triggering signal at every turn.
Preferably, described transmit leg also comprises:
Counting unit is used for the video data frame number that described second transmitting element has sent is counted;
Whole frame sends trigger element, is used for from first video data frame, when described counting unit counting arrives n * N, triggers second transmitting element and sends a complete video data frame to transfer server respectively; Described second transmitting element sends to transfer server with video data frame with default frame head form when can not get the triggering of described whole frame transmission trigger element;
Wherein n is a natural number, and N is the interval frame number of regulation.
Preferably, described transmit leg also comprises:
Put trigger element blanking time, be used for storing in advance one blanking time rule, from first video data frame, each of the point at described blanking time of rule defined triggers second transmitting element and sends a complete video data frame to transfer server blanking time; Described second transmitting element sends to transfer server with video data frame with default frame head form when can not get putting the triggering of trigger element described blanking time.
Preferably, described recipient specifically comprises:
First receiving element is used for receiving respectively each video data frame that transfer server is sent;
First decoding unit, each video data frame that is used for respectively described first receiving element being received carries out decoding processing;
The first request message transmitting element is used for before first decoding unit carries out decoding processing to the video data frame of current reception, sends to transfer server to be used to ask transfer server to send the request message of next video data frame.
Preferably, described recipient specifically comprises:
Second receiving element is used for receiving respectively each video data frame that transfer server is sent;
The frame head extraction unit is used for that each complete video data frame that described second receiving element receives is extracted frame head data and handles;
The frame head buffer unit is used for the last frame head data of extracting of described frame head extraction unit is carried out buffer memory;
Second decoding unit is used for the frame head data according to described frame head buffer unit current cache, and each video data frame that described second receiving element is received carries out decoding processing respectively;
The second request message transmitting element is used for before second decoding unit carries out decoding processing to the video data frame of current reception, sends to transfer server to be used to ask transfer server to send the request message of next video data frame.
Preferably, described transmit leg is portable terminal or PC terminal; Described recipient is a portable terminal.
Preferably, described portable terminal support is handled the encoding and decoding that video data carries out joint photographic experts group JPEG agreement.
The beneficial effect that the present invention can reach is as follows:
Method of transmitting video data of the present invention and transmission system thereof propose by transfer server the video data frame that video data transmission side sends to be carried out buffer memory, and the video data recipient is before each video data frame to current reception carries out decoding processing simultaneously, can send next video data frame to the transfer server request, the request that transfer server response recipient sends, a video data frame that receives at first in the video data frame of buffer memory is sent to the recipient, so just can avoid in the prior art owing to the unstable jam that produces of mobile network's empty port load-supporting bandwidth, also can avoid carrying out in the prior art transmission of video data and receive handling the effective relatively poor drawback of the video communication that is caused, therefore can improve the real-time and the stability of video communication.
Simultaneously, the present invention also proposes transmit leg with predetermined distance time or predetermined distance frame number, send a complete video data frame, only send for remaining video data frame with the form of default frame head, so video data frame taking that can reduce to transmit to mobile network's empty port load-supporting bandwidth, further reduce the jam occurrence probability that causes owing to the not enough problem of mobile network's empty port load-supporting bandwidth, therefore also can and then improve the real-time and the stability of video communication.
When if the present invention simultaneously also proposes transmit leg or recipient's portable terminal, adopt joint photographic experts group (JPEG, Joint Photographic Experts Group) agreement is carried out the encoding and decoding processing to video data, to satisfy the disposal ability of existing portable terminal.
In addition, the present invention also proposes to use ICP/IP protocol or udp protocol to carry out video Data Transmission in the video communication process, therefore can be applicable to computer network and mobile communications network fully.
Description of drawings
Fig. 1 is that the system that realizes visual video communication in the prior art between PC terminal and the portable terminal forms topological diagram;
Fig. 2 is the main realization principle flow chart of method of transmitting video data of the present invention;
Fig. 3 is the transmission state schematic diagram of video data frame in the inventive method;
Fig. 4 is the entire process process schematic diagram of the inventive method;
The network system topological diagram that Fig. 5 is applied in for the inventive method principle;
Fig. 6 is the main composition structured flowchart of video-frequency data transmission system of the present invention;
Fig. 7 is the main composition structured flowchart of transmit leg in the system of the present invention;
Fig. 8 forms structured flowchart for first embodiment of transmit leg in the system of the present invention;
Fig. 9 forms structured flowchart for second embodiment of transmit leg in the system of the present invention;
Figure 10 mainly forms structured flowchart for first embodiment of recipient in the system of the present invention;
Figure 11 mainly forms structured flowchart for second embodiment of recipient in the system of the present invention.
Embodiment
Carry out the instant video not enough problem of expressive ability in when communication at having now at mobile communications network, the present invention propose a kind of can be between the different mobile terminal or carry out the real time video data transmission method and the transmission system thereof of point-to-point or point-to-multipoint between portable terminal and the PC terminal.
Please refer to Fig. 2, this figure is the main realization principle flow chart of method of transmitting video data of the present invention, and its main implementation procedure comprises:
Step S10, the transfer server in the video communication system carry out buffer memory to the video data frame that transmit leg is sent respectively;
Wherein, consider if the recipient in the video communication system when the portable terminal, to have to the encoding and decoding disposal ability of portable terminal (as mobile phone) and the network transmission speed of mobile radio communication thereof are considered, therefore need here transmit leg is weighed the frame rate of video data acquiring and the size of each frame video data thereof, considering under the situation of these factors, through repeatedly test and consider in the ordinary course of things, in the normal video interaction process, mutual both sides' image does not have very frequently and change in displacement fast, therefore can guarantee that transmit leg sends one-frame video data with per second, and the size of every frame video data is 80 * 60pixels, just can satisfy normal video communication fully and exchange.
Therefore, transmit leg can be selected to send each frame video data of self gathering with periodic law, and detailed process can be as follows:
Set in advance the one-period rule, be spaced apart 1S as the cycle;
Transmit leg at point each of the periods rules of this setting regulation, sends a video data frame to transfer server respectively cycle time, as the period interval time according to above-mentioned setting, sends with the rule of a video data frame of per second transmission;
Like this, transfer server just can carry out buffer memory to each video data frame that receives respectively.
Wherein realizing based on the mobile network in the process of video communication, should consider to reduce how effectively the size of each frame video data, to reduce each frame video data shared transmission bandwidth in the mobile network, the present invention is by observing the practical video data transmission procedure, find that the video data of terminal by the camera picked-up is under the situation that size does not change, its continuous each frame video data all has the frame head data of equal length (0x26f), so the present invention proposes to adopt following method to come video data frame is handled here:
The initiator of video data frame begins every at regular intervals (as 10s from first video data frame, 20s etc.) or the certain frame number in every interval (as 10 frames, 20 frames etc.) after, send the complete video Frame of a band frame head data, the video data frame that is sent between this all is the video data frame that removes this length (0x26f) frame head data, the recipient is after receiving complete video data frame for the first time, preserve the frame head of this complete video Frame, and follow-up receive complete video data frame at every turn after, use the frame head of the video data frame that newly receives to upgrade local frame head data of preserving, the recipient is before receiving next complete video data frame, use the frame head data of local current preservation to finish the follow-up decoding processing that does not have the video data frame of frame head data, the transmission course of its video data frame as shown in Figure 3, be that transmit leg is only at the 1st frame, the n+1 frame, 2n+1 frame ... .. transmits complete video data frame, only transmits the video data frame of not being with frame head data at all the other frames.
Experimental results show that, through after the processing of above method, for general size is the video data frame of 80 * 60pixels, under the medium situation of the assurance quality of image, can be controlled at the size of the shared transmission bandwidth of video data frame that removes frame head data about 0.6～1.1K, such transmission bandwidth size takies under the transmission rate of now GPRS network or CDMA1X network, can satisfy normal video communication fully and exchange.
Based on above-mentioned, transmit leg can transmit each video data frame according to following process:
Transmit leg sends a complete video data frame to transfer server from first video data frame every N frame (N can be 10 or 20);
For difference N frame at interval between per two complete video data frames, transmit leg sends to transfer server with it with default frame head form respectively then.The 1st frame can be sent as complete video data frame as transmit leg, after this 2nd frame to the 11 frames sent the video data frame of default frame head form respectively; Be sent as complete video data frame at the 12nd frame, after this 13rd frame to the 22 frames sent the video data frame of default frame head form respectively ... and the like.
In addition, transmit leg can also transmit each video data frame according to following process:
Transmit leg sends a complete video data frame to transfer server from first video data frame at each predetermined distance time point (can be 10s or 20s blanking time);
In the time between the predetermined distance time point, transmit leg sends to transfer server with default frame head form respectively with video data frame; Can send complete video data frame at the 1st second as transmit leg, in 10 seconds intervals after this, send the video data frame of default frame head form respectively; Send complete video data frame at the 11st second, in 10 seconds intervals after this, send the video data frame of default frame head form respectively ... and the like.
Step S20, transfer server is when receiving each video data frame that also the buffer memory transmit leg is sent, when receiving the request message that the recipient sends at every turn, a video data frame that receives at first in the video data frame of current cache is sent to the recipient, wherein the recipient can be used to ask transfer server to send the request message of next video data frame to the transfer server transmission before the current video data frame of sending carries out decoding processing to transfer server.When the transfer server receives first video data frame that transmit leg sends, can not carry out caching process, directly be transmitted to the recipient, continue to receive the video data frame that follow-up transmit leg is sent then, when the recipient receives first video data frame that transfer server sends, before this video data frame is carried out decoding processing, send next video data frame to the transfer server request; Follow-up recipient before the video data frame to current reception carries out decoding processing, can send next video data frame to the transfer server request, and so forth at every turn when receiving the video data frame that transfer server sends.
Because above-mentioned transmit leg can send a complete video data frame with certain blanking time or with certain interval frame number, so the recipient also can receive major part accordingly not with the video data frame of frame head, therefore how incomplete video data frame being carried out decoding processing is the problem that must should consider, because frame head data is the indispensable important information of video data that decodes real needs in video data frame, the present invention proposes the recipient here and adopts following process to realize respectively each video data frame that receives being carried out decoding processing:
S1. the recipient is when for the first time receiving the complete video Frame that transfer server sends, and the frame head data of the complete video Frame of this reception is saved in this locality;
S2. recipient's frame head data of preserving according to this locality is carried out decoding processing to the video data frame of the default frame head of follow-up reception;
S3. the recipient uses the frame head data of this complete video Frame that receives to upgrade local last frame head data of preserving when receiving the complete video Frame that transfer server sends next time, returns then and continues execution in step S2; Like this by the circulation between step S2 and the step S3 repeatedly, just can realize that the recipient carries out decoding processing to each video data frame that receives respectively, the video data frame that no matter receives is complete, and is still incomplete.
Wherein above-mentioned mentioned transmit leg can or be a portable terminal for the PC terminal, and the recipient is a portable terminal; When being portable terminal as transmit leg, sender mobile terminal can be used the JPEG agreement that video data is carried out encoding and decoding and handle, because JPEG encoding and decoding agreement encoding-decoding process for the MPEG agreement is comparatively simple, and occupied terminal processing resource is less; In like manner recipient's portable terminal also uses the JPEG agreement that video data is carried out the encoding and decoding processing.Wherein can directly call self corresponding JPEG codec functions for the portable terminal of supporting JPEG encoding and decoding agreement (as mobile phone etc.) finishes encoding and decoding and handles, and can realize by transplanting existing JPEG encoding and decoding program library for the portable terminal of not supporting the JPEG codec functions, promptly the existing JPEG encoding and decoding program process of moving on the PC terminal is transformed, it can be operated on the portable terminal, reach the function that the JPEG encoding and decoding are handled in the portable terminal support.
This shows that the method for transmitting video data of the above-mentioned proposition of the present invention proposes the video Data Transmission mode based on " drawing ", and in transfer server, increase the method for data buffering.Based on these characteristics, the concise and to the point implementation procedure of method of transmitting video data of the present invention is exactly:
Video data transmission side (as 10s, 20s) at a certain time interval sends each frame video data to transfer server, and transfer server carries out buffer memory to each frame video data; Simultaneously, the video data recipient is (and before beginning decoding) after receiving the video data of each frame, to transfer server request next frame video data, the request that transfer server response recipient sends, from buffer memory, read corresponding video data frame and send to the video data recipient, so just can be so that the influence between the receiving course of the process of transmitting of transmit leg video data frame and recipient's video data frame has dropped to minimum, improved the actual effect of video communication, specifically please refer to Fig. 4, this figure is the entire process process schematic diagram of the inventive method.
The inventive method proposes to adopt in video communication system ICP/IP protocol or udp protocol to realize video data frame is transmitted simultaneously, because ICP/IP protocol or the udp protocol general Data Transport Protocol that is network, can make the unified network transmission protocol shielding the Internet and the bottom host-host protocol of mobile radio communication get difference, can realize that video communication system regards the Internet and mobile radio communication as a uniform communication network, adopt the unified network transmission protocol, needn't be after the problem of many considerations network insertion.
As shown in Figure 5, it is the network system topological diagram that the inventive method principle is applied in, as shown in the figure, by in this system, implementing the inventive method, can realize carrying out instant video Data Transmission by PC terminal 10 to portable terminal 20, make the user to see the video image of gathering on the PC terminal 10 immediately by portable terminal (as mobile phone) 20 by IP network.
As fully visible, method of transmitting video data of the present invention realizes that principle is simple, is easy to realize, after adopting method of transmitting video data of the present invention, can make the user pass through portable terminal, see the video data that the PC terminal use gathers anywhere or anytime, strengthen the ageing of video communication.Simultaneously, the video communication system that method of transmitting video data of the present invention proposes to be carried adopts TCP/IP host-host protocol or UDP host-host protocol to realize the transmission of video data, makes the unified network transmission protocol shield the underlying protocol difference of the Internet and mobile radio communication; Regard the Internet and mobile radio communication as unified network thus, can realize adopting unified network processes mode, needn't too much consider the network insertion problem, reduced the complexity of video communication system.
Accordingly, the present invention has also proposed a kind of video-frequency data transmission system with reference to above-mentioned method of transmitting video data, please refer to Fig. 6, this figure is the main composition structured flowchart of video-frequency data transmission system of the present invention, it mainly comprises video data transmission side 110, transfer server 30 and video data recipient 210, wherein transfer server 30 mainly comprises buffer unit 301, Frame extraction unit 302 and first transmitting element 303, and the effect and the interconnected relationship thereof of each part are as follows:
First transmitting element 303 exists logic to be connected with Frame extraction unit 302, and each video data frame that is used for respectively Frame extraction unit 302 being extracted sends to recipient 210.
Please refer to Fig. 7, this figure is the main composition structured flowchart of transmit leg in the system of the present invention, and its transmit leg 110 mainly comprises the cycle trigger element 1101 and second transmitting element 1102, and wherein the effect of these two component units and annexation thereof are as follows:
Please refer to Fig. 8, this figure is that first embodiment of transmit leg forms structured flowchart in the system of the present invention, its transmit leg 110 is formed on the basis of structure at Fig. 7, and then comprise that also counting unit 1103 and whole frame send trigger element 1104, wherein the main effect and the annexation each other thereof of counting unit 1103 and whole frame transmission trigger element 1104 are as follows:
Counting unit 1103 exists logic to be connected with second transmitting element 1102, is used for the video data frame number that second transmitting element 1102 has sent is counted processing;
Whole frame sends trigger element 1104, exist logic to be connected with counting unit 1103, be used for from first video data frame, (wherein n is a natural number when counting unit 1103 counting arrives n * N respectively, N is the interval frame number of regulation), trigger complete video data frame of second transmitting element, 1102 transmissions and carry out buffer memory to the buffer unit 301 in the transfer server 30; And second transmitting element 1102 when can not get whole frame and send the triggering of trigger element 1104, respectively video data frame is carried out buffer memory with the buffer unit 301 that default frame head form sends in the transfer server 30.
Please refer to Fig. 9, this figure is that second embodiment of transmit leg forms structured flowchart in the system of the present invention, its transmit leg 110 is formed on the basis of structure at Fig. 7, and then also comprise and put trigger element 1105 blanking time, exist logic to be connected with second transmitting element 1102, be used for storing in advance one blanking time rule, with from first video data frame, at each of the point of this of rule defined blanking time blanking time, trigger second transmitting element 1102 and send complete video data frame buffer unit 301 in the transfer server 30 and carry out buffer memory; And second transmitting element 1102 when can not get putting the triggering of trigger element 1105 blanking time, respectively video data frame is sent to default frame head form that buffer unit 301 carries out buffer memory in the transfer server 30.
Please refer to Figure 10, this figure is that recipient's first embodiment mainly forms structured flowchart in the system of the present invention, its recipient 210 mainly comprises first receiving element 2101, first decoding unit 2102 and 2,103 three parts of the first request message transmitting element, and the effect and the interconnected relationship thereof of its each part are as follows:
First receiving element 2101 exists logic to be connected with first transmitting element 303 in the transfer server 30, is used for receiving respectively each video data frame that first transmitting element 303 of transfer server 30 is sent;
The first request message transmitting element 2103, exist logic to be connected with first decoding unit 2102 with Frame extraction unit 302 in the transfer server 30 respectively, be used for before the video data frame of 2102 pairs of current receptions of first decoding unit carries out decoding processing, Frame extraction unit in transfer server 30 302 sends the request message that the Frame extraction unit 302 that is used for asking transfer server 30 sends next video data frame.
Please refer to Figure 11, this figure is that recipient's second embodiment mainly forms structured flowchart in the system of the present invention, its recipient 210 mainly comprises second receiving element 2104, frame head extraction unit 2105, frame head buffer unit 2106, second decoding unit 2107 and the second request message transmitting element 2108, and wherein the effect of each part and annexation each other thereof are as follows:
Frame head extraction unit 2105 exists logic to be connected with second receiving element 2104, is used for that each complete video data frame that second receiving element 2104 receives is extracted frame head data and handles;
Frame head buffer unit 2106 exists logic to be connected with frame head extraction unit 2105, is used for the frame head extraction unit 2105 the last frame head data of extracting are carried out buffer memory;
The second request message transmitting element 2108, exist logic to be connected with second decoding unit 2107 with Frame extraction unit 302 in the transfer server 30 respectively, be used for before the video data frame of 2107 pairs of current receptions of second decoding unit carries out decoding processing, Frame extraction unit in transfer server 30 302 sends the request message that the Frame extraction unit 302 that is used for asking transfer server 30 sends next video data frame.
Wherein mentioned transmit leg can or be a portable terminal for the PC terminal in the said system, and the recipient is a portable terminal, if transmit leg is portable terminal or recipient during for portable terminal, then requires this portable terminal to support the encoding and decoding disposal ability of JPEG agreement.
Wherein the realization principle of the appropriate section of the method for transmitting video data of the specific implementation principle of each functional unit in the invention described above video-frequency data transmission system and the above-mentioned proposition of the present invention is same or similar, please specifically with reference to it, no longer too much gives unnecessary details here.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (17)
1, a kind of method of transmitting video data is applied in the video communication system that comprises video data transmission side, transfer server and video data recipient, it is characterized in that, comprises step:
A. described transfer server carries out buffer memory to the video data frame that described transmit leg is sent respectively;
B. transfer server sends to the recipient with a video data frame that receives at first in the video data frame of current cache at every turn when receiving the request message that described recipient sends.
2, the method for claim 1 is characterized in that, described steps A specifically comprises step:
A1. set in advance the one-period rule;
A2. described transmit leg at point each of described periods rules regulation, sends a video data frame to transfer server respectively cycle time;
A3 red switch server carries out buffer memory to each video data frame that receives respectively.
3, method as claimed in claim 2 is characterized in that, described transmit leg transmission video data frame specifically comprises step to the process of transfer server:
A1. described transmit leg sends a complete video data frame to transfer server from first video data frame every the N frame; And
A2. respectively remaining video data frame is sent to transfer server with default frame head form.
4, method as claimed in claim 2 is characterized in that, described transmit leg transmission video data frame specifically comprises step to the process of transfer server:
A11. described transmit leg sends a complete video data frame to transfer server from first video data frame at each predetermined distance time point; And
A12. the video data frame with all the other times sends to transfer server with default frame head form respectively.
5, as claim 3 or 4 described methods, it is characterized in that, also comprise step:
C. described recipient is saved in this locality with the frame head data of the complete video Frame of this reception when for the first time receiving the complete video Frame that transfer server sends; And
D. the frame head data of preserving according to this locality is carried out decoding processing to the video data frame of the default frame head of follow-up reception;
E. described recipient uses the frame head data of this complete video Frame that receives to upgrade local last frame head data of preserving when receiving the complete video Frame that transfer server sends next time, returns step D then.
6, the method for claim 1, it is characterized in that, among the described step B, the recipient is used to ask transfer server to send the request message of next video data frame to the transfer server transmission before the current video data frame of sending carries out decoding processing to transfer server.
7, as described method as described in the claim 1,2,3,4 or 6, it is characterized in that described transmit leg is portable terminal or PC terminal; Described recipient is a portable terminal.
8, method as claimed in claim 7 is characterized in that, when described transmit leg was portable terminal, described transmit leg used joint photographic experts group JPEG agreement that video data is carried out encoding and decoding and handles; And
When described recipient was portable terminal, described recipient used joint photographic experts group JPEG agreement that video data is carried out encoding and decoding and handles.
As described method as described in the claim 1,2,3,4 or 6, it is characterized in that 9, described video communication system adopts ICP/IP protocol or udp protocol that video data frame is transmitted.
10, a kind of video-frequency data transmission system comprises video data transmission side, transfer server and video data recipient, it is characterized in that described transfer server comprises:
Buffer unit, the video data frame that is used for respectively described transmit leg being sent carries out buffer memory;
The Frame extraction unit is used for when receiving the request message that described recipient sends at every turn, extracts a video data frame that receives at first in the video data frame of described buffer unit current cache;
First transmitting element, each video data frame that is used for respectively described Frame extraction unit being extracted sends to the recipient.
11, system as claimed in claim 10 is characterized in that, described transmit leg specifically comprises:
The cycle trigger element is used for storing in advance the one-period rule, when putting each cycle time that arrives described periods rules regulation, generates a triggering signal;
Second transmitting element is used for respectively sending a video data frame to transfer server when described cycle trigger element is sent triggering signal at every turn.
12, system as claimed in claim 11 is characterized in that, described transmit leg also comprises:
Counting unit is used for the video data frame number that described second transmitting element has sent is counted;
Whole frame sends trigger element, is used for from first video data frame, when described counting unit counting arrives n * N, triggers second transmitting element and sends a complete video data frame to transfer server respectively; Described second transmitting element sends to transfer server with video data frame with default frame head form when can not get the triggering of described whole frame transmission trigger element;
Wherein n is a natural number, and N is the interval frame number of regulation.
13, system as claimed in claim 11 is characterized in that, described transmit leg also comprises:
Put trigger element blanking time, be used for storing in advance one blanking time rule, from first video data frame, each of the point at described blanking time of rule defined triggers second transmitting element and sends a complete video data frame to transfer server blanking time; Described second transmitting element sends to transfer server with video data frame with default frame head form when can not get putting the triggering of trigger element described blanking time.
14, system as claimed in claim 10 is characterized in that, described recipient specifically comprises:
First receiving element is used for receiving respectively each video data frame that transfer server is sent;
First decoding unit, each video data frame that is used for respectively described first receiving element being received carries out decoding processing;
The first request message transmitting element is used for before first decoding unit carries out decoding processing to the video data frame of current reception, sends to transfer server to be used to ask transfer server to send the request message of next video data frame.
15, as claim 12 or 13 described systems, it is characterized in that described recipient specifically comprises:
Second receiving element is used for receiving respectively each video data frame that transfer server is sent;
The frame head extraction unit is used for that each complete video data frame that described second receiving element receives is extracted frame head data and handles;
The frame head buffer unit is used for the last frame head data of extracting of described frame head extraction unit is carried out buffer memory;
Second decoding unit is used for the frame head data according to described frame head buffer unit current cache, and each video data frame that described second receiving element is received carries out decoding processing respectively;
The second request message transmitting element is used for before second decoding unit carries out decoding processing to the video data frame of current reception, sends to transfer server to be used to ask transfer server to send the request message of next video data frame.
As claim 10,11,12,13 or 14 described systems, it is characterized in that 16, described transmit leg is portable terminal or PC terminal; Described recipient is a portable terminal.
17, system as claimed in claim 16 is characterized in that, described portable terminal support is handled the encoding and decoding that video data carries out joint photographic experts group JPEG agreement.
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