CN104253996A - Video data sending and receiving methods, video data sending and receiving devices and video data transmission system - Google Patents
Video data sending and receiving methods, video data sending and receiving devices and video data transmission system Download PDFInfo
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Abstract
The invention discloses video data sending and receiving methods, video data sending and receiving devices and a video data transmission system. The sending method comprises the following steps that according to mark information used for showing that a current frame is a background frame and/or a non-background frame, the background frame in the original coding code stream of a video image is determined; each determined background frame is segmented into at least two data packets, auxiliary code stream marks are respectively added into the data packets, and then, the data packets are encapsulated for forming an auxiliary code stream; after main code marks are added into each non-background frame in the original coding code steam, the non-background frame is encapsulated, and a main code stream is formed; the auxiliary code stream and the main code stream are sent. The background frame is segmented into at least two data packets, the auxiliary code stream marks are respectively added into the data packets, then, the data packets are encapsulated for forming the auxiliary code stream, the auxiliary code stream and the main code stream are subsequently sent, the direct transmission of the background frame is avoided, the time delay or loss of the subsequent non-background frame due to too high image instant code rate in the code stream transmission process can be reduced, meanwhile, the quality of high-quality background images used as the background frame is not reduced, and the transmission band width and the image quality are both considered.
Description
Technical field
The present invention relates to video coding and decoding technology, particularly relate to a kind of sending, receiving method of video data and device thereof and transmission system.
Background technology
At present, for digital video access terminal from conventional personal computer (PC) to smart mobile phone, personal digital assistant (Personal Digital Assistant, PDA), the development of the multiple terminal such as flat board.Digital video signal is also faced with different transmission environments, comprises wireless network, 3G (Third Generation) Moblie (3G) network etc.Different receiving terminals has different disposal abilities and storage capacity, and different network environments has different transmission bandwidths, and this proposes very large challenge to the transmission of digital video.
For these reasons, the video compression technology that can reduce the transmission bandwidth of network requires also more and more comes into one's own.Usually, usually comprise a large amount of redundant informations in digital video, such as: spatial redundancy, time redundancy and comentropy redundancy.Video compression main purpose is exactly remove the redundant information in digital video.Because video signal data amount is comparatively large, needs very large transmission bandwidth, therefore needed to compress vision signal before transmission digital video signal.In addition, video compression has two requirements: a) certain compression ratio; B) certain quality is ensured.
Predictive coding is one of important technical eliminating redundant information in digital video.Namely predictive coding utilizes the correlation between signal, uses one or more signal above as the predicted value of current demand signal, to encode to the actual value of current demand signal and the difference of predicted value.In inter prediction encoding, the image as current demand signal predicted value is called reference picture, and reference picture usually has higher quality and code check.
Usually, background frames can as the reference picture of successive image, but for the Internet Transmission environment of fixed-bandwidth and low bandwidth, background frames becomes the bottleneck of transmission.This is because, background frames is the high-quality background image obtained by image modeling in sequence, if modeling is desirable, the piece image without any prospect can be obtained, in order to successive image Efficient Compression (with reference to background frames), usually adopt high-quality coding method to background frames, its cataloged procedure have employed the process of encoded key frames (I frame) exactly, amount of encoded data is comparatively large, has higher quality.If directly transmit background frames, easily cause too high time delay or the loss causing follow-up non-background frames of the instantaneous code check of image in bit stream; If reduce the quality of the high-quality background image of frame as a setting, the follow-up needs of impact are carried out the compression effectiveness of the non-background frames of encoding with reference to this high-quality background image, cause the decline of overall performance.Therefore, when transmitting for the video data containing background frames in prior art, there is the problem can not taking into account transmission bandwidth and picture quality.
Summary of the invention
In view of this, a kind of sending, receiving method of video data and device thereof and transmission system is embodiments provided, in order to solve the problem can not taking into account transmission bandwidth and picture quality in prior art.
The embodiment of the present invention provides a kind of sending, receiving method of video data and device thereof and transmission system, specific as follows:
First aspect, a kind of sending method of video data, described method comprises:
According to for representing that present frame is the identification information of background frames and/or non-background frames, determine the background frames in the original coding code stream of video image;
Each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier respectively, form auxiliary code stream;
Encapsulate after each non-background frames in original coding code stream being added main bit stream mark, form main bit stream;
Send described auxiliary code stream and main bit stream.
By this possible execution mode, background frames is divided at least two packets, carry out encapsulation after adding auxiliary code traffic identifier respectively and form auxiliary code stream, follow-up transmission auxiliary code stream and main bit stream, avoid and directly transmit background frames, reduce the time delay or the loss that cause follow-up non-background frames because the instantaneous code check of image in bit stream is too high, do not reduce the quality of the high-quality background image of frame as a setting simultaneously yet, follow-up needs carry out the not high quality background image of encoding compression effectiveness with reference to this high-quality background image can not be affected, transmission bandwidth and picture quality are taken into account.
In conjunction with first aspect, in the implementation that the first is possible, the described auxiliary code stream of described transmission and main bit stream, comprising:
Auxiliary code stream and main bit stream described in time-sharing send, wherein, described auxiliary code stream be sent time point be not later than need this auxiliary code stream to carry out the main bit stream of decoding be sent time point.
In conjunction with the first possible implementation of first aspect, in the implementation that the second is possible, described each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier respectively, form auxiliary code stream, comprising:
According to the requirement to packet in the channel capacity under the data volume size of background frames, current bandwidth and procotol, each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier respectively, form auxiliary code stream.
In conjunction with first aspect, the first possible implementation of first aspect or the possible implementation of the second of first aspect, in the implementation that the third is possible, comprise the image sequence number of the playing sequence for representing each two field picture in described original coding code stream, described method also comprises:
Determine that the maximum of image sequence in original coding code stream number is less than the image frames numbers comprised in described original coding code stream;
Generate each main bit stream and the position offset of each auxiliary code stream in original coding code stream, this position offset represents the side-play amount relative to the sequence head position in original coding code stream;
The described main bit stream of described transmission and auxiliary code stream comprise:
When sending main bit stream, the position offset of this main bit stream is sent in company with this main bit stream;
When sending auxiliary code stream, the position offset of this auxiliary code stream is sent in company with this auxiliary code stream.
In conjunction with first aspect, the first possible implementation of first aspect or the possible implementation of the second of first aspect, in the 4th kind of possible implementation, comprise the image sequence number of the playing sequence for representing each two field picture in described original coding code stream, described method also comprises:
Determine that the maximum of image sequence in original coding code stream number equals the image frames numbers comprised in described original coding code stream;
Described each background frames determined is divided at least two packets after, before encapsulating after adding auxiliary code traffic identifier respectively, described method also comprises:
Be numbered splitting the described packet that obtains, numbering is added corresponding packet, described numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to this packet and this packet.
Second aspect, a kind of method of reseptance of video data, described method comprises:
Receiving video data code stream, described stream of video data comprises the main bit stream containing main bit stream mark and the auxiliary code stream containing auxiliary code traffic identifier, described auxiliary code stream is that each background frames determined is divided at least two packets, carry out after adding auxiliary code traffic identifier respectively encapsulate formed, described main bit stream each non-background frames in original coding code stream is added main bit stream mark after carry out encapsulation formation;
According to the mark comprised in code stream, determine the main bit stream in the code stream received and auxiliary code stream;
The main bit stream determined and auxiliary code stream are reduced to the original coding code stream of video image, for decoders decode.
By this possible execution mode, due to reception is that background frames is divided at least two packets, carry out encapsulation after adding auxiliary code traffic identifier respectively and form auxiliary code stream and main bit stream, reduce the time delay or the loss that cause follow-up non-background frames because the instantaneous code check of image in bit stream is too high, do not reduce the quality of the high-quality background image of frame as a setting simultaneously yet, follow-up needs carry out the not high quality background image of encoding compression effectiveness with reference to this high-quality background image can not be affected, taken into account transmission bandwidth and picture quality.
In conjunction with second aspect, in the implementation that the first is possible, in company with there being the position offset in original coding code stream of this main bit stream or auxiliary code stream in each main bit stream received or auxiliary code stream, this position offset is the side-play amount relative to the sequence head position in original coding code stream;
The described original coding code stream main bit stream determined and auxiliary code stream being reduced to video image, for decoders decode, comprising:
Utilize companion in each main bit stream or auxiliary code stream received to have the position offset in original coding code stream of this main bit stream or auxiliary code stream, the main bit stream determined and auxiliary code stream are reduced to the original coding code stream of video image, for decoders decode.
In conjunction with second aspect, in the implementation that the second is possible, described auxiliary code stream comprises numbering, described main bit stream comprises image sequence number, described image sequence is number for representing the playing sequence of each two field picture, and described numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to the packet that this auxiliary code stream comprises and this packet;
The described original coding code stream main bit stream determined and auxiliary code stream being reduced to video image, for decoders decode, comprising:
Utilize described numbering that the auxiliary code stream determined is reduced to background frames, and determine the image sequence number of the background frames reduced;
The image sequence number utilizing the image sequence number of the background frames of reduction and main bit stream to comprise, is reduced to original coding code stream, for decoders decode by this background frames and main bit stream.
The third aspect, described device comprises:
First determining unit, for according to for representing that present frame is the identification information of background frames and/or non-background frames, determines the background frames in the original coding code stream of video image;
Auxiliary code stream forming unit, for each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier, forms auxiliary code stream;
Main bit stream forming unit, encapsulates, forms main bit stream after each non-background frames in original coding code stream being added main bit stream mark;
Transmitting element, for sending described auxiliary code stream and main bit stream.
By this possible execution mode, background frames is divided at least two packets, carry out encapsulation after adding auxiliary code traffic identifier respectively and form auxiliary code stream, follow-up transmission auxiliary code stream and main bit stream, avoid and directly transmit background frames, reduce the time delay or the loss that cause follow-up non-background frames because the instantaneous code check of image in bit stream is too high, do not reduce the quality of the high-quality background image of frame as a setting simultaneously yet, follow-up needs carry out the not high quality background image of encoding compression effectiveness with reference to this high-quality background image can not be affected, transmission bandwidth and picture quality are taken into account.
In conjunction with the third aspect, in the implementation that the first is possible, described transmitting element, is further used for auxiliary code stream and main bit stream described in time-sharing send, wherein, described auxiliary code stream be sent time point be not later than need this auxiliary code stream to carry out the main bit stream of decoding be sent time point.
In conjunction with the third aspect, in the implementation that the second is possible, described auxiliary code stream forming unit, be further used for the requirement to packet in channel capacity under the data volume size according to background frames, current bandwidth and procotol, each background frames determined is divided at least two packets, encapsulate after adding auxiliary code traffic identifier respectively, form auxiliary code stream.
In conjunction with the third aspect, the first possible implementation of the third aspect or the possible implementation of the second of the third aspect, in the implementation that the third is possible, described device also comprises:
Second determining unit, for determining that the maximum of image sequence in original coding code stream number is less than the image frames numbers comprised in described original coding code stream;
Position offset generation unit, for generating each main bit stream and the position offset of each auxiliary code stream in original coding code stream, this position offset represents the side-play amount relative to the sequence head position in original coding code stream.
Described transmitting element, when being further used for sending main bit stream, sends the position offset of this main bit stream in company with this main bit stream; When sending auxiliary code stream, the position offset of this auxiliary code stream is sent in company with this auxiliary code stream.
In conjunction with the third aspect, the first possible implementation of the third aspect or the possible implementation of the second of the third aspect, in the 4th kind of possible implementation, described device also comprises:
3rd determining unit, for determining that the maximum of image sequence in original coding code stream number equals the image frames numbers comprised in described original coding code stream;
Numbered cell, for described each background frames determined is divided at least two packets after, before encapsulating after adding auxiliary code traffic identifier respectively, be numbered splitting the described packet obtained, numbering is added corresponding packet, and described numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to this packet and this packet.
Fourth aspect, a kind of receiving system of video data, described device comprises:
Receiving element, for receiving video data code stream, described stream of video data comprises the main bit stream containing main bit stream mark and the auxiliary code stream containing auxiliary code traffic identifier, described auxiliary code stream is that each background frames determined is divided at least two packets, carry out after adding auxiliary code traffic identifier respectively encapsulate formed, described main bit stream each non-background frames in original coding code stream is added main bit stream mark after carry out encapsulation formation;
Code stream type determining units, for according to the mark comprised in code stream, determines the main bit stream in the code stream received and auxiliary code stream;
Reduction unit, for the main bit stream determined and auxiliary code stream being reduced to the original coding code stream of video image, for decoders decode.
By this possible execution mode, due to reception is that background frames is divided at least two packets, carry out encapsulation after adding auxiliary code traffic identifier respectively and form auxiliary code stream and main bit stream, reduce the time delay or the loss that cause follow-up non-background frames because the instantaneous code check of image in bit stream is too high, do not reduce the quality of the high-quality background image of frame as a setting simultaneously yet, follow-up needs carry out the not high quality background image of encoding compression effectiveness with reference to this high-quality background image can not be affected, taken into account transmission bandwidth and picture quality.
In conjunction with fourth aspect, in the implementation that the first is possible, in company with there being the position offset in original coding code stream of this main bit stream or auxiliary code stream in each main bit stream received or auxiliary code stream, this position offset is the side-play amount relative to the sequence head position in original coding code stream;
Described reduction unit, is further used for utilizing companion in each code stream of reception to have the position offset in original coding code stream of this code stream, the main bit stream determined and auxiliary code stream is reduced to the original coding code stream of video image, for decoders decode.
In conjunction with fourth aspect, in the implementation that the second is possible, described auxiliary code stream comprises numbering, described main bit stream comprises image sequence number, described image sequence is number for representing the playing sequence of each two field picture, and described numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to the packet that this auxiliary code stream comprises and this packet;
Described reduction unit, is further used for utilizing described numbering that the auxiliary code stream determined is reduced to background frames, and determines the image sequence number of the background frames reduced;
The image sequence number utilizing the image sequence number of the background frames of reduction and main bit stream to comprise, is reduced to original coding code stream, for decoders decode by this background frames and main bit stream.
5th aspect, a kind of transmission system of video data, described system comprises: the dispensing device of above-mentioned arbitrary video data and the receiving system of above-mentioned arbitrary video data.
By this possible execution mode, background frames is divided at least two packets, carry out encapsulation after adding auxiliary code traffic identifier respectively and form auxiliary code stream, follow-up transmission auxiliary code stream and main bit stream, avoid and directly transmit background frames, reduce the time delay or the loss that cause follow-up non-background frames because the instantaneous code check of image in bit stream is too high, do not reduce the quality of the high-quality background image of frame as a setting simultaneously yet, follow-up needs carry out the not high quality background image of encoding compression effectiveness with reference to this high-quality background image can not be affected, transmission bandwidth and picture quality are taken into account.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly introduced, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the sending method of a kind of video data in the embodiment of the present invention one;
Fig. 2 is the schematic diagram that after source code flow data being extracted in the embodiment of the present invention one adds inlet identity, Reseal forms main bit stream and auxiliary code stream;
Fig. 3 is the encoded hierarchy schematic diagram of the video sequence in the embodiment of the present invention one;
The code flow structure schematic diagram of level of Fig. 4 for obtaining after encoding to the video sequence shown in Fig. 3 in the embodiment of the present invention one;
Fig. 5 is the flow chart of the sending method of another kind of video data in the embodiment of the present invention one;
Fig. 6 is the flow chart of the method for reseptance of a kind of video data in the embodiment of the present invention two;
Fig. 7 is the schematic diagram being reduced to original coding code stream after utilizing the code stream of reception to determine main bit stream and auxiliary code stream in the embodiment of the present invention two;
Fig. 8 is one of structural representation of the dispensing device of a kind of video data in the embodiment of the present invention three;
Fig. 9 is the structural representation two of the dispensing device of a kind of video data in the embodiment of the present invention three;
Figure 10 is the structural representation three of the dispensing device of a kind of video data in the embodiment of the present invention three;
Figure 11 is the structural representation of the receiving system of video data in the embodiment of the present invention four;
Figure 12 is the structural representation of the transmission system of video data in the embodiment of the present invention five.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
In order to solve the problem can not taking into account transmission bandwidth and picture quality of the prior art, the embodiment of the present invention provides a kind of sending, receiving method of video data and device thereof and transmission system.
Be described in detail the present invention program below by specific embodiment, certainly, the present invention is not limited to following examples.
Embodiment one
The embodiment of the present invention one provides a kind of sending method of video data, and its flow chart as shown in Figure 1, specifically comprises the following steps:
Step 101: according to for representing that present frame is the identification information of background frames and/or non-background frames, determine the background frames in the original coding code stream of video image;
Usually, image type in Video coding has 5 kinds, be respectively intracoded frame (Intra picture, I frame, also claim key frame), forward-predictive-coded frames (Predictive-frame, P frame), bi-directional predicted interpolation coding frame (Bi-directional interpolated prediction frame, B frame), background frames (backGround frame, G frame) and switch frame (Switched, S frame).Wherein, I frame, P frame, B frame and S frame can be called non-background frames.Certainly, be not limited to above-mentioned image type, also can define other image type according to actual needs.After being utilized by video the coded system of frame to encode, namely obtain the original coding code stream of video image; The identification information which kind of frame flag bit mark present frame is is had, as flag bit or initial code information in code stream.
Be high-quality code stream with background frames, other frames are audio/video encoding standard (the Audio Video coding Standard of the code stream of high compression rate, AVS) be example, background frames and non-background frames are in same code stream, have whether flag bit mark present frame is background frames in AVS code stream.More specifically, if there is background in code stream, background image flag bit (background_picture_flag) and be 1, and background image output identification position (background_picture_output_flag) flag bit is 0, then determine that present frame is background frames.
Step 102: each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier respectively, forms auxiliary code stream;
Preferably, this step 102 comprises:
According to the requirement to packet in the channel capacity under the data volume size of background frames, current bandwidth and procotol, each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier respectively, form auxiliary code stream.
Above-mentioned steps 102 specifically comprises: the every segment encode stream obtained after obtaining source code flow segmentation after encoding to the image of background frames is added application layer protocol data cell (Protocol Data Unit respectively successively, PDU), the PDU of the PDU of transport layer, the PDU of network layer and data link layer, namely the packet after background frames is split is obtained, finally add that auxiliary code traffic identifier encapsulates, change into auxiliary code stream from physical layer out.
Further, the preferred steps of above-mentioned steps 102 can also be specially following steps A further to step D:
Steps A: judge the data volume of background frames determined whether be greater than current bandwidth under channel capacity; If the determination result is YES, then perform step B, if judged result is no, then perform step C;
Step B: according to the requirement to the data volume of packet in the channel capacity under current bandwidth and procotol, the background frames this determined is divided at least two packets, encapsulate after these at least two packets are added auxiliary code traffic identifier respectively, form auxiliary code stream, the size of the arbitrary packet in above-mentioned at least two packets is all not more than the channel capacity under current bandwidth;
Step C: judge whether the data volume of the above-mentioned background frames determined is greater than the restriction to the maximum of the data volume of packet in procotol, if so, then performs step D; If not, then step e is performed;
Step D: then according in procotol to the requirement of the data volume of packet, the background frames this determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier respectively, forms auxiliary code stream.
Perform step e: encapsulate after directly the background frames determined being added auxiliary code traffic identifier, form auxiliary code stream.
Preferably, in order to obtain the positional information of the packet after segmentation in source code flow, be convenient to follow-up recipients reduce to background frames, above-mentioned each background frames determined is divided at least two packets after, before encapsulating after adding auxiliary code traffic identifier respectively, said method also comprises:
Be numbered splitting the packet obtained, numbering is added corresponding packet, and this numbering is for determining the background frames belonging to this packet and the position of data in this background frames in this packet.
Step 103: encapsulate after each non-background frames in original coding code stream being added main bit stream mark, form main bit stream;
After determining the background frames in original coding code stream during specific implementation, remaining encoding code stream is non-background frames.
Consider that background frames is the high-quality background image obtained by the image modeling in video sequence, amount of encoded data comparatively large (such as: several times of background frames normally I frame in AVS), larger data volume means higher instantaneous code check, if background frames and non-background frames are transmitted in same code stream, when bandwidth is lower, can not transmitting in time of background frames will be caused, this will cause the decoding time delay to needing this background image as the subsequent frame of decoding with reference to frame, therefore, in above-mentioned steps 102 and step 103, background frames and non-background frames are reorganized into different code streams, and background frames is split, be divided at least two packets, avoid and directly transmit background frames, reduce and cause the follow-up time delay of non-background frames or the appearance of loss because the instantaneous code check of image in bit stream is too high.
Auxiliary code traffic identifier in step 102 and step 103 and main bit stream mark can be flags, such as: with 0 mark main bit stream, identify auxiliary code stream with 1;
It should be noted that, be first perform after step 102 to perform step 103 in above-mentioned, also step 102 and step 103 can carry out simultaneously, perform step 102 after first can also performing step 103.
Fig. 2 give source code flow data are extracted add inlet identity after Reseal form the schematic diagram of main bit stream and auxiliary code stream; Original coding code stream comprises sequence head, view data (being also non-background frames), high quality graphic data (being also background frames) as can be known from Fig. 2; Extract after adding inlet identity and become the main bit stream be made up of view data and the auxiliary code stream be made up of high quality graphic data, the high quality graphic data that it should be noted that in Fig. 2 in auxiliary code stream are the high quality graphic data to obtaining after the high quality graphic Data Segmentation in original coding code stream.
Step 104: send above-mentioned auxiliary code stream and main bit stream.
Preferably, this step 104 comprises:
The above-mentioned auxiliary code stream of time-sharing send and main bit stream, wherein, above-mentioned auxiliary code stream be sent time point be not later than need this auxiliary code stream to carry out the main bit stream of decoding be sent time point.
Particularly, auxiliary code stream is distributed to after between main bit stream and sends, can time-sharing send be realized.
Because the number of background frames in video sequence is usually less, and in code stream, be positioned at the position needing to carry out before the non-background frames of decoding with reference to it, therefore, the auxiliary code stream that the packet that time-sharing send obtains after being split by background frames transforms and the main bit stream transformed by non-background frames, and ensure this auxiliary code stream be sent time point be not later than need this auxiliary code stream to carry out the main bit stream of decoding be sent time point, the packet priority of formation background frames can be made to send, this background frames end of transmission when guaranteeing that non-background frames needs background frames to decode, the decoding time delay to the non-background frames needing this background frames to decode as reference frame that the transmission because of background frames can be avoided to cause not in time.
Further, although the essence of auxiliary code stream splits to background frames the packet obtained, but because the data volume splitting the packet obtained is still larger, send in two or more auxiliary code adfluxion, the instantaneous transmission rate of code stream still may be caused to uprush, in order to avoid uprushing of the instantaneous transmission rate of code stream, auxiliary code stream is distributed to after between main bit stream and sends, wherein, the code stream adjacent with each auxiliary code stream is main bit stream, can realize time-sharing send.
In addition, after encoder is encoded to video image, the image sequence number (Picture Order Count, POC) of the playing sequence for representing this two field picture in the encoding code stream of every two field picture, is all comprised; Below by Fig. 3 and Fig. 4, the position of this image sequence number in encoding code stream is described:
It is the encoded hierarchy schematic diagram of video sequence shown in Fig. 3; Wherein, video sequence is made up of image; Image is made up of sheet; Sheet is made up of encoding block.
The code flow structure schematic diagram of level of Fig. 4 for obtaining after encoding to the video sequence shown in Fig. 3, as shown in Figure 4, the original coding code stream of video is made up of sequence; Sequence comprises sequence head and view data; View data comprises image head and sheet data; Sheet packet is containing head and macro block data; Wherein, image head comprises image sequence number.
Owing to all comprising image sequence number in the original coding code stream of every two field picture, image sequence number for representing the playing sequence of each two field picture, therefore, after main bit stream and auxiliary code stream being sent, can utilize this image sequence number to carry out the reduction of code stream usually; But, consider the figure place less (such as only having 2 bytes) of image sequence that a part of encoder encodes goes out number, therefore image sequence maximum is 255, again from 0 open numbering after more than 255; Send after auxiliary code stream is distributed to main bit stream in the embodiment of the present invention, the sending order of picture frame is not carry out according to the order of image sequence number, therefore, the image sequence number of this dispersed auxiliary code stream may duplicate with the image sequence of other follow-up code stream number, this may cause the decoding of recipient to occur mistake, original coding code stream is correctly restored out in order to ensure recipient, and then correctly decode, preferably, the sending method of above-mentioned video data is further comprising the steps of, and its flow process as shown in Figure 5.
Step 501: judge to determine whether the maximum of image sequence in original coding code stream number is less than the image frames numbers comprised in above-mentioned original coding code stream; If so, step 502 is performed; If not, step 503 is performed.
This step 501 can the arbitrary step after or before above-mentioned steps 101-step 103 perform, and also can perform with the arbitrary step in step 101-step 103 simultaneously.
Step 502: generate each main bit stream and the position offset of each auxiliary code stream in original coding code stream, this position offset represents the side-play amount relative to the sequence head position in original coding code stream.
Particularly, above-mentioned position offset available offsets sequence head how many units represent, wherein per unit represents a main bit stream or an auxiliary code stream.
This step 502 can perform after above-mentioned steps 103 and before step 104.
After completing here step 502, when sending main bit stream, the position offset of this main bit stream is sent in company with this main bit stream; When sending auxiliary code stream, the position offset of this auxiliary code stream is sent in company with this auxiliary code stream.
Step 503: judge to determine whether the maximum of image sequence in original coding code stream number equals the image frames numbers comprised in above-mentioned original coding code stream; If so, step 504 is performed; If not, then encoding code stream is pointed out to make mistakes.
Step 504: above-mentioned each background frames determined is divided at least two packets after, before encapsulating after adding auxiliary code traffic identifier respectively, be numbered splitting the packet obtained, numbering is added corresponding packet, and this numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to this packet and this packet.
Illustrate in more detail below by the concrete sending method of example to above-mentioned video data.
Suppose that original coding code stream is: I1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 G16 P17 P18.
Wherein, the I in I1 represents intracoded frame, and 1 be the image sequence number representing this I frame is 1; P in P2 represents forward-predictive-coded frames, and 2 is represent that the image sequence number of this P frame is that G in 2, G16 represents background frames, and 16 are the image sequences number representing this G frame is 16, and all the other are similar, repeat no more.
The first step: determine that the background frames in original coding code stream is G16;
Second step: the background frames G16 determined is divided into 10 packets, be numbered splitting the packet obtained, subscript abcdefghij represents, encapsulate after adding auxiliary code traffic identifier respectively, the auxiliary code stream of formation is: G16a G16b G16c G16d G16e G16f G16g G16h G16i G16j;
3rd step: encapsulate after each non-background frames being added main bit stream mark, the main bit stream of formation is: I1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P17 P18;
4th step: the main bit stream in the auxiliary code stream in time-sharing send second step and the 3rd step, wherein, auxiliary code stream G16a G16b G16c G16d G16e G16f G16g G16h G16i G16j be sent that time point is not later than main bit stream P17, the P18 needing this auxiliary code stream to carry out decoding be sent time point.
The time point that is sent meeting above-mentioned auxiliary code stream G16a G16b G16c G16d G16e G16f G16g G16h G16i G16j is not later than a kind of possible transmission result that this auxiliary code stream of needs carries out this condition of time point that is sent of main bit stream P17, the P18 decoded and is: I1 G16a P2 G16b P3 G16c P4 G16d P5 G16e P6 G16f P7 G16g G16h P8 G16i P9 G16j P10 P11 P12 P13 P14 P15 P17 P18.
Certainly, also result can be sent for other, as long as meet the main bit stream time-sharing send in the auxiliary code stream in second step and the 3rd step, and guarantee auxiliary code stream be sent time point be not later than need this auxiliary code stream to carry out the main bit stream of decoding be sent time point.
From above-mentioned concrete example, achieve in the scheme of the present embodiment and transmit G frame data in advance, and the packet forming G frame is not (time that the packet of each formation G frame shifts to an earlier date is different) of transmitting, time sharing transmissions after namely data being broken up simultaneously.
In the technical scheme of the embodiment of the present invention one, background frames is divided at least two packets, carry out encapsulation after adding auxiliary code traffic identifier respectively and form auxiliary code stream, follow-up transmission auxiliary code stream and main bit stream, avoid and directly transmit background frames, reduce the time delay or the loss that cause follow-up non-background frames because the instantaneous code check of image in bit stream is too high, do not reduce the quality of the high-quality background image of frame as a setting simultaneously yet, follow-up needs carry out the not high quality background image of encoding compression effectiveness with reference to this high-quality background image can not be affected, transmission bandwidth and picture quality are taken into account.
Embodiment two
Based on the same inventive concept with embodiment one, the embodiment of the present invention two provides a kind of method of reseptance of video data, and its flow process as shown in Figure 6, comprises the following steps:
Step 601: receiving video data code stream, this stream of video data comprises the main bit stream containing main bit stream mark and the auxiliary code stream containing auxiliary code traffic identifier, this auxiliary code stream is that each background frames determined is divided at least two packets, carry out after adding auxiliary code traffic identifier respectively encapsulate formed, this main bit stream each non-background frames in original coding code stream is added main bit stream mark after carry out encapsulation formation;
Step 602: according to the mark comprised in code stream, determines the main bit stream in the code stream received and auxiliary code stream;
Step 603: the original coding code stream main bit stream determined and auxiliary code stream being reduced to video image, for decoders decode.
Usually image sequence number is comprised in stream of video data due to reception, therefore, in the scheme of the embodiment of the present invention two, the image sequence number comprised in code stream can be utilized, the main bit stream determined and auxiliary code stream are reduced to the original coding code stream of video image, for decoders decode.
Fig. 7 is reduced to the schematic diagram of original coding code stream after giving and utilizing the code stream received to determine main bit stream and auxiliary code stream;
Preferably, above-mentioned auxiliary code stream receive time point be not later than need this auxiliary code stream to carry out the main bit stream of decoding receive time point.Now, this background frames end of transmission when also namely ensure that non-background frames needs background frames to decode, the transmission avoided because of background frames cause not in time to the decoding time delay needing this background frames as the non-background frames of decoding with reference to frame.
Preferably, for the ease of correct reduction original bit stream, in company with when having a position offset in original coding code stream of this main bit stream or auxiliary code stream in each main bit stream or auxiliary code stream of above-mentioned reception, utilize in each main bit stream or auxiliary code stream received in company with the position offset in original coding code stream having this main bit stream or auxiliary code stream, the main bit stream determined and auxiliary code stream are reduced to the original coding code stream of video image, for decoders decode, this position offset is the side-play amount relative to the sequence head position in original coding code stream.
Comprise numbering at above-mentioned auxiliary code stream, when above-mentioned main bit stream comprises image sequence, utilize above-mentioned numbering that the auxiliary code stream determined is reduced to background frames, and determine the image sequence number of the background frames reduced; Utilize the image sequence number that the image sequence number of the background frames of reduction and main bit stream comprise, this background frames and main bit stream are reduced to original coding code stream, for decoders decode, above-mentioned image sequence is number for representing the playing sequence of each two field picture, and this numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to the packet that this auxiliary code stream comprises and this packet.
Be described below by the concrete method of reseptance of example to the video data in the embodiment of the present invention two.
What suppose to receive is the I1 G16a P2 G16b P3 G16c P4 G16d P5 G16e P6 G16f P7 G16g G16h P8 G16i P9 G16j P10 P11 P12 P13 P14 P15 P17 P18 code stream sent in embodiment one, now, the auxiliary code stream of known reception comprises numbering, above-mentioned main bit stream comprises image sequence number, then utilize the method for reseptance of the video data in the embodiment of the present invention two, the concrete step performed is as follows:
The first step: decapsulation packet, comprise in this packet be designated main bit stream mark time, determine that this code stream is main bit stream, this packet indulge comprise be designated auxiliary code traffic identifier time, determine that this code stream is auxiliary code stream; Now determine that main bit stream is I1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P17 P18, auxiliary code stream is: G16a G16b G16c G16d G16e G16f G16g G16h G16i G16j;
Second step: utilize the coding 16a 16b 16c 16d 16e 16f 16g 16h 16i 16j comprised in auxiliary code stream that auxiliary code stream is reduced to background frames G, and the image sequence number determining this background frames is 16;
3rd step: the image sequence number of background frames utilizing the image sequence of each main bit stream number and determine, the above-mentioned background frame G of main bit stream and reduction is reduced to original coding code stream, is: I1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 G16 P17 P18.
In the scheme of the embodiment of the present invention two, because the auxiliary code stream received is that each background frames determined is divided at least two packets, carry out after adding auxiliary code traffic identifier respectively encapsulate formed, therefore, avoid too high time delay or the loss causing follow-up non-background frames of the instantaneous code check of image in bit stream to a great extent, the code stream received is made to be above complete code stream largely, and be the code stream of the good image of compression effectiveness, therefore, the original coding code stream integrality obtained after reduction is higher, good basis is provided for subsequent decoding goes out high-quality video image.
Embodiment three
Based on the same inventive concept with embodiment one, the embodiment of the present invention three provides a kind of dispensing device of video data, its structural representation as shown in Figure 8, comprising: the first determining unit 81, auxiliary code stream forming unit 82, main bit stream forming unit 83 and transmitting element 84; Wherein:
First determining unit 81, for according to for representing that present frame is the identification information of background frames and/or non-background frames, determines the background frames in the original coding code stream of video image;
Auxiliary code stream forming unit 82, for each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier, forms auxiliary code stream;
Main bit stream forming unit 83, encapsulates, forms main bit stream after each non-background frames in original coding code stream being added main bit stream mark;
Transmitting element 84, for sending auxiliary code stream and main bit stream.
Preferably, above-mentioned transmitting element 84, is further used for the above-mentioned auxiliary code stream of time-sharing send and main bit stream, wherein, above-mentioned auxiliary code stream be sent time point be not later than need this auxiliary code stream to carry out the main bit stream of decoding be sent time point.
Preferably, above-mentioned auxiliary code stream forming unit 82, be further used for the requirement to packet in channel capacity under the data volume size according to background frames, current bandwidth and procotol, each background frames determined is divided at least two packets, encapsulate after adding auxiliary code traffic identifier respectively, form auxiliary code stream.
On the basis of the above-mentioned device of above-mentioned Fig. 8, the embodiment of the present invention two also proposes a kind of dispensing device of video data, and the structural representation of this device as shown in Figure 9, except the unit comprised in the above-mentioned device of Fig. 8, also comprises:
Second determining unit 91, for determining that the maximum of image sequence in original coding code stream number is less than the image frames numbers comprised in above-mentioned original coding code stream;
Position offset generation unit 92, for generating each main bit stream and the position offset of each auxiliary code stream in original coding code stream, this position offset represents the side-play amount relative to the sequence head position in original coding code stream.
Above-mentioned transmitting element 84, when being further used for sending main bit stream, sends the position offset of this main bit stream in company with this main bit stream; When sending auxiliary code stream, the position offset of this auxiliary code stream is sent in company with this auxiliary code stream.
On the basis of the above-mentioned device of above-mentioned Fig. 8, the embodiment of the present invention two also proposes a kind of dispensing device of video data, and the structural representation of this device as shown in Figure 10, except the unit comprised in the above-mentioned device of Fig. 8, also comprises:
3rd determining unit 1001, for determining that the maximum of image sequence in original coding code stream number equals the image frames numbers comprised in above-mentioned original coding code stream;
Numbered cell 1002, for above-mentioned each background frames determined is divided at least two packets after, before encapsulating after adding auxiliary code traffic identifier respectively, be numbered splitting the above-mentioned packet obtained, numbering is added corresponding packet, and this numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to this packet and this packet.
Embodiment four
Based on the same inventive concept with embodiment two, the embodiment of the present invention four provides a kind of receiving system of video data, and its structural representation as shown in figure 11, comprising: receiving element 111, code stream type determining units 112 and reduction unit 113; Wherein:
Receiving element 111, for receiving video data code stream, this stream of video data contains the main bit stream of main bit stream mark and the auxiliary code stream containing auxiliary code traffic identifier, above-mentioned auxiliary code stream is that each background frames determined is divided at least two packets, carry out after adding auxiliary code traffic identifier respectively encapsulate formed, above-mentioned main bit stream each non-background frames in original coding code stream is added main bit stream mark after carry out encapsulation formation;
Code stream type determining units 112, for according to the mark comprised in code stream, determines the main bit stream in the code stream received and auxiliary code stream;
Reduction unit 113, for the main bit stream determined and auxiliary code stream being reduced to the original coding code stream of video image, for decoders decode.
Preferably, in company with the position offset in original coding code stream having this code stream in each code stream of above-mentioned reception, this position offset is the side-play amount relative to the sequence head position in original coding code stream;
Above-mentioned reduction unit 113, is further used for utilizing companion in each code stream of reception to have the position offset in original coding code stream of this code stream, the main bit stream determined and auxiliary code stream is reduced to the original coding code stream of video image, for decoders decode.
Preferably, above-mentioned auxiliary code stream comprises numbering, above-mentioned main bit stream comprises image sequence number, above-mentioned image sequence is number for representing the playing sequence of each two field picture, and above-mentioned numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to the packet that this auxiliary code stream comprises and this packet.
Above-mentioned reduction unit 113, is further used for utilizing above-mentioned numbering that the auxiliary code stream determined is reduced to background frames, and determines the image sequence number of the background frames reduced; The image sequence number utilizing the image sequence number of the background frames of reduction and main bit stream to comprise, is reduced to original coding code stream, for decoders decode by this background frames and main bit stream.
Embodiment five
Based on the same inventive concept with the embodiment of the present invention one to embodiment four, the embodiment of the present invention five provides a kind of transmission system of video data, as shown in figure 12, said system comprises its structural representation: the dispensing device 120 of video data and the receiving system 121 of video data;
Wherein, the dispensing device 120 of above-mentioned video data is the dispensing device of the arbitrary video data in embodiment three, and the receiving system 121 of above-mentioned video data is the receiving system of the arbitrary video data in embodiment four.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (17)
1. a sending method for video data, is characterized in that, described method comprises:
According to for representing that present frame is the identification information of background frames and/or non-background frames, determine the background frames in the original coding code stream of video image;
Each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier respectively, form auxiliary code stream;
Encapsulate after each non-background frames in original coding code stream being added main bit stream mark, form main bit stream;
Send described auxiliary code stream and main bit stream.
2. the sending method of video data as claimed in claim 1, it is characterized in that, the described auxiliary code stream of described transmission and main bit stream, comprising:
Auxiliary code stream and main bit stream described in time-sharing send, wherein, described auxiliary code stream be sent time point be not later than need this auxiliary code stream to carry out the main bit stream of decoding be sent time point.
3. the sending method of video data as claimed in claim 1, is characterized in that, described each background frames determined is divided at least two packets, encapsulates, form auxiliary code stream, comprising after adding auxiliary code traffic identifier respectively:
According to the requirement to packet in the channel capacity under the data volume size of background frames, current bandwidth and procotol, each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier respectively, form auxiliary code stream.
4. the sending method of the video data as described in as arbitrary in claim 1-3, it is characterized in that, comprise the image sequence number of the playing sequence for representing each two field picture in described original coding code stream, described method also comprises:
Determine that the maximum of image sequence in original coding code stream number is less than the image frames numbers comprised in described original coding code stream;
Generate each main bit stream and the position offset of each auxiliary code stream in original coding code stream, this position offset represents the side-play amount relative to the sequence head position in original coding code stream;
The described main bit stream of described transmission and auxiliary code stream comprise:
When sending main bit stream, the position offset of this main bit stream is sent in company with this main bit stream;
When sending auxiliary code stream, the position offset of this auxiliary code stream is sent in company with this auxiliary code stream.
5. the sending method of the video data as described in as arbitrary in claim 1-3, it is characterized in that, comprise the image sequence number of the playing sequence for representing each two field picture in described original coding code stream, described method also comprises:
Determine that the maximum of image sequence in original coding code stream number equals the image frames numbers comprised in described original coding code stream;
Described each background frames determined is divided at least two packets after, before encapsulating after adding auxiliary code traffic identifier respectively, described method also comprises:
Be numbered splitting the described packet that obtains, numbering is added corresponding packet, described numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to this packet and this packet.
6. a method of reseptance for video data, is characterized in that, described method comprises:
Receiving video data code stream, described stream of video data comprises the main bit stream containing main bit stream mark and the auxiliary code stream containing auxiliary code traffic identifier, described auxiliary code stream is that each background frames determined is divided at least two packets, carry out after adding auxiliary code traffic identifier respectively encapsulate formed, described main bit stream each non-background frames in original coding code stream is added main bit stream mark after carry out encapsulation formation;
According to the mark comprised in code stream, determine the main bit stream in the code stream received and auxiliary code stream;
The main bit stream determined and auxiliary code stream are reduced to the original coding code stream of video image, for decoders decode.
7. the method for reseptance of video data as claimed in claim 6, it is characterized in that, in company with there being the position offset in original coding code stream of this main bit stream or auxiliary code stream in each main bit stream received or auxiliary code stream, this position offset is the side-play amount relative to the sequence head position in original coding code stream;
The described original coding code stream main bit stream determined and auxiliary code stream being reduced to video image, for decoders decode, comprising:
Utilize companion in each main bit stream or auxiliary code stream received to have the position offset in original coding code stream of this main bit stream or auxiliary code stream, the main bit stream determined and auxiliary code stream are reduced to the original coding code stream of video image, for decoders decode.
8. the method for reseptance of video data as claimed in claim 6, it is characterized in that, described auxiliary code stream comprises numbering, described main bit stream comprises image sequence number, described image sequence is number for representing the playing sequence of each two field picture, and described numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to the packet that this auxiliary code stream comprises and this packet;
The described original coding code stream main bit stream determined and auxiliary code stream being reduced to video image, for decoders decode, comprising:
Utilize described numbering that the auxiliary code stream determined is reduced to background frames, and determine the image sequence number of the background frames reduced;
The image sequence number utilizing the image sequence number of the background frames of reduction and main bit stream to comprise, is reduced to original coding code stream, for decoders decode by this background frames and main bit stream.
9. a dispensing device for video data, is characterized in that, described device comprises:
First determining unit, for according to for representing that present frame is the identification information of background frames and/or non-background frames, determines the background frames in the original coding code stream of video image;
Auxiliary code stream forming unit, for each background frames determined is divided at least two packets, encapsulates after adding auxiliary code traffic identifier, forms auxiliary code stream;
Main bit stream forming unit, encapsulates, forms main bit stream after each non-background frames in original coding code stream being added main bit stream mark;
Transmitting element, for sending described auxiliary code stream and main bit stream.
10. the dispensing device of video data as claimed in claim 9, it is characterized in that, described transmitting element, be further used for auxiliary code stream and main bit stream described in time-sharing send, wherein, described auxiliary code stream be sent time point be not later than need this auxiliary code stream to carry out the main bit stream of decoding be sent time point.
The dispensing device of 11. video datas as claimed in claim 9, it is characterized in that, described auxiliary code stream forming unit, be further used for the requirement to packet in channel capacity under the data volume size according to background frames, current bandwidth and procotol, each background frames determined is divided at least two packets, encapsulate after adding auxiliary code traffic identifier respectively, form auxiliary code stream.
12. as arbitrary in claim 9-11 as described in the dispensing device of video data, it is characterized in that, described device also comprises:
Second determining unit, for determining that the maximum of image sequence in original coding code stream number is less than the image frames numbers comprised in described original coding code stream;
Position offset generation unit, for generating each main bit stream and the position offset of each auxiliary code stream in original coding code stream, this position offset represents the side-play amount relative to the sequence head position in original coding code stream;
Described transmitting element, when being further used for sending main bit stream, sends the position offset of this main bit stream in company with this main bit stream; When sending auxiliary code stream, the position offset of this auxiliary code stream is sent in company with this auxiliary code stream.
13. as arbitrary in claim 9-11 as described in the dispensing device of video data, it is characterized in that, described device also comprises:
3rd determining unit, for determining that the maximum of image sequence in original coding code stream number equals the image frames numbers comprised in described original coding code stream;
Numbered cell, for described each background frames determined is divided at least two packets after, before encapsulating after adding auxiliary code traffic identifier respectively, be numbered splitting the described packet obtained, numbering is added corresponding packet, and described numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to this packet and this packet.
The receiving system of 14. 1 kinds of video datas, is characterized in that, described device comprises:
Receiving element, for receiving video data code stream, described stream of video data comprises the main bit stream containing main bit stream mark and the auxiliary code stream containing auxiliary code traffic identifier, described auxiliary code stream is that each background frames determined is divided at least two packets, carry out after adding auxiliary code traffic identifier respectively encapsulate formed, described main bit stream each non-background frames in original coding code stream is added main bit stream mark after carry out encapsulation formation;
Code stream type determining units, for according to the mark comprised in code stream, determines the main bit stream in the code stream received and auxiliary code stream;
Reduction unit, for the main bit stream determined and auxiliary code stream being reduced to the original coding code stream of video image, for decoders decode.
The receiving system of 15. video datas as claimed in claim 14, it is characterized in that, in company with there being the position offset in original coding code stream of this main bit stream or auxiliary code stream in each main bit stream received or auxiliary code stream, this position offset is the side-play amount relative to the sequence head position in original coding code stream;
Described reduction unit, is further used for utilizing companion in each code stream of reception to have the position offset in original coding code stream of this code stream, the main bit stream determined and auxiliary code stream is reduced to the original coding code stream of video image, for decoders decode.
The receiving system of 16. video datas as claimed in claim 14, it is characterized in that, described auxiliary code stream comprises numbering, described main bit stream comprises image sequence number, described image sequence is number for representing the playing sequence of each two field picture, and described numbering is for determining the position of data in this background frames in the image sequence number of the background frames belonging to the packet that this auxiliary code stream comprises and this packet;
Described reduction unit, is further used for utilizing described numbering that the auxiliary code stream determined is reduced to background frames, and determines the image sequence number of the background frames reduced;
The image sequence number utilizing the image sequence number of the background frames of reduction and main bit stream to comprise, is reduced to original coding code stream, for decoders decode by this background frames and main bit stream.
The transmission system of 17. 1 kinds of video datas, is characterized in that, described system comprises: the dispensing device of the arbitrary described video data of claim 9-13 and the receiving system of the arbitrary described video data of claim 14-16.
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