CN102368834A - Self-adaption video transmission system and method of cell terminal network - Google Patents
Self-adaption video transmission system and method of cell terminal network Download PDFInfo
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Abstract
The embodiment of the invention discloses a self-adaption video transmission system and method of a cell terminal network. The system comprises a first decoder, a first coder, a network state estimation module, a second decoder, a first buffer region and a second buffer region, wherein the first decoder is used for converting the format of a received analog video signal into a digital signal format; the first coder is used for coding a received high-definition digital video signal in an FGS (Fine Granular Scalability) manner; the network state estimation module is used for an estimation algorithm which is used for determining which frame dropping policy is adopted for the first buffer region according to relevant information, of network bandwidth, sent by the second buffer region; and the second decoder is used for decoding a video code stream provided by the second buffer region and converting the video code stream into digital television signals to be used by a home user. By implementing the invention, uniform video signal coding and smoother cell video signal transmission are realized, so that the problems that the user cannot watch the television and the like due to blockage of the video signals are avoided.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of district end network self-adapting Video transmission system and method.
Background technology
Along with the rise of the information-based industry of digital home and the continuous trial of different management development patterns; With the sub-district is the approval that the pattern of minimum management unit obtains majority; And become the informationalized developing direction of Guangdong digital home, be necessary so carry out digital home's technical research as the unit object with the sub-district.
In modern times in the digital living; Video tastes has accounted for the very big a part of proportion in the home entertaining; Each face of people's each side all be unable to do without the influence of visual effect, but because the restriction of situation such as hardware resource and transmission line is not that all TV users of whole sub-district can both be play with high-definition video signal; So be necessary to carry out based on the sub-district is the video transmission technologies research of unit; If because still do not adopt any strategy to carry out the video transmission management, the there bandwidth resources are fully not enough, so need a kind of problem that end server adaptive video transmission system solves district's end Bandwidth Management and distribution of distinguishing; Can utilize bandwidth resources better like this, guarantee that as far as possible all users of sub-district can receive best vision signal.
Come the signals such as digital TV network of managed together community user now through the sub-district, will cause certain customers can't use functions such as video request program if the mistake multi-user carries out network operation simultaneously, even cause large-area network blockage.
Summary of the invention
The objective of the invention is in the future is in digital home's management mode development trend with the sub-district; A kind of adaptive video transmission system and method based on district's end server is provided; Realize that through this transmission system unified video signal coding and sub-district video signal transmission are unobstructed more gently, cause consequences such as to watch TV to avoid the user video signal to produce blocking.
In order to address the above problem, the present invention proposes a kind of district end network self-adapting Video transmission system, said system comprises:
First decoder is used for the analog video signal that receives is changed into digital signals format;
First encoder is used for received high-definition digital video signal FGS coding;
First buffering area; The video flowing that is used for having encoded is filled into first buffering area; Guarantee the mild transmission of video flowing in network through cushioning certain data volume; And the data of the explanation bandwidth utilization rate state of accepting to send over from the network state estimation module, thereby realize the code check adjustment at coding side, be that means realize bandwidth control with the frame losing;
The network state estimation module, the relevant information of the network bandwidth that is used for sending over according to second buffering area, and confirm to adopt a kind of assessment algorithm of which kind of frame losing strategy to first buffering area;
Second buffering area; Be used for mild video flowing transmission; And bear the function that a network state information is smelt spy, data occupation rate, current network data packets for transmission Loss Rate, data packet transmission is overtime, packet comes and goes total time data and sends to the network state estimation module;
Second decoder, the video code flow that is used for second buffering area is provided is decoded, and transforms into digital television signal and supplies the domestic consumer to use.
Said FGS coding is a kind of fine granularity scalable coding techniques that is provided by MPEG-4; Through this coded system video sequence coding is resolved into basic layer bit stream and two code streams of enhancement layer bitstream; Basic layer bit stream is to be used to decode the most basic necessary code stream of video of formation; Enhancement layer bitstream is the code stream that is used to strengthen the required extra increase of video effect, and when the decoder reconstructing video flowed, enhancement layer bitstream served as additional role; Basic layer bit stream decoding just can be satisfied the needs of mobile video, decodes together in conjunction with a part of enhancement layer bitstream and just can satisfy the call format of SD video.
Said first buffering area is according to this two parts important information of last free area in the bandwidth occupancy situation of network state estimation module feedback and the buffering area, and first buffering area can select to abandon the lower frame of video of corresponding importance to adopt the video mode of adaptation bandwidth status.
Said video mode is HD video pattern or SD video mode or mobile device video mode.
The network state estimation module is judging that network bandwidth utilization rate does not surpass first threshold, then feeds back not frame losing strategy to first buffering area; Judge that network bandwidth utilization rate surpasses first threshold, and during less than second threshold value, then feedback abandon synthetic high-definition video signal the enhancement layer frame strategy to first buffering area; Judge when network bandwidth utilization rate surpasses second threshold value, then feedback abandon synthetic SD vision signal the enhancement layer frame strategy to first buffering area.
Said first threshold is more than 50%, and first threshold is less than second threshold value, and the first threshold and second threshold value are less than 100%.
Accordingly, the embodiment of the invention also provides a kind of district end network self-adapting video transmission method, and said method comprises:
Video flowing is decoded;
Decoded code stream is unified the FGS coding;
The video flowing of having encoded is inserted first buffering area, wait for sending, and judge the current frame losing strategy that should adopt according to the state information of feedback through network;
It is to be decoded that video flowing gets into second buffering area etc., launches network information state simultaneously and smell the spy function, obtains the correlation bandwidth data message;
Estimate current network state according to the correlation bandwidth data message, and judged result and the frame losing strategy decision that next should adopt are fed back to first buffering area;
Decode to become through the video flowing of second buffering area and can be used for the analog signal that DTV is play.
Saidly estimate current network state, and judged result and the frame losing strategy decision that next should adopt are fed back to first buffering area comprise according to the correlation bandwidth data message:
When judging that network bandwidth utilization rate does not surpass first threshold, then feed back not frame losing strategy to first buffering area;
Judging that network bandwidth utilization rate surpasses first threshold, and during less than second threshold value, then feedback abandon synthetic high-definition video signal the enhancement layer frame strategy to first buffering area;
When judging that network bandwidth utilization rate surpasses second threshold value, then feedback abandon synthetic SD vision signal the enhancement layer frame strategy to first buffering area.
Said first threshold is more than 50%, and first threshold is less than second threshold value, and the first threshold and second threshold value are less than 100%.
In embodiments of the present invention; The objective of the invention is in district's end server; A kind of adaptive Video transmission system is provided, realizes that through this Video transmission system the sub-district internal bandwidth is distributed and the vision signal conversion, make community user at utmost watch video glibly.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the district's end network self-adapting Video transmission system structure chart in the embodiment of the invention;
Fig. 2 is the district's end network self-adapting video transmission method flow chart in the embodiment of the invention;
Fig. 3 is the decision flow chart of assessing of the data estimating buffering area B is sent of the network state in the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Below in conjunction with Fig. 1 the composition of system is described: native system is by an encoder; Two decoders (promptly first decoder is that decoder A, second decoder are decoder B); Two buffering areas (promptly first buffering area is buffering area A, and second buffering area is buffering area B) and the network state estimation module that is embedded among the district end server CPU are formed.The function of each several part is following:
Decoder A: the analog video signal that receives is changed into digital signals format.Because district's received video flowing coded format of end server differs, and in order to reunify coding, at first will pass through decoder decode.
Encoder A: digital signal worked out again be converted into the analog signal format that can continue to transmit, just with received high-definition digital video signal FGS coding.So-called FGS is a kind of fine granularity scalable coding techniques that is provided by MPEG-4; Through this coded system video sequence coding is resolved into basic layer bit stream and two code streams of enhancement layer bitstream; Basic layer bit stream is to be used to decode the most basic necessary code stream of video of formation; Enhancement layer bitstream is the code stream (enhancement layer adopts bit-plane coding, and different bit-planes importance are different, and the video flowing that is used for reconstruct is also different) that is used to strengthen the required extra increase of video effect; When the decoder reconstructing video flows; Enhancement layer bitstream serves as additional role, decodes such as basic layer bit stream and just can satisfy the needs of mobile video, decodes together in conjunction with a part of enhancement layer bitstream and just can satisfy the call format of SD video.
Buffering area A: buffering area A mainly realizes two parts function.First's function is exactly that the video flowing of having encoded is filled in the buffering area, guarantees the mild transmission of video flowing in network through cushioning certain data volume; The second portion function is exactly the data of the explanation bandwidth utilization rate state accepting to send over from back network state estimation module, thereby realizes the code check adjustment at coding side, is that means realize bandwidth control with the frame losing.According to this two parts important information of last free area in the bandwidth occupancy situation of back network state estimation module feedback and the buffering area; Buffering area can select to abandon the lower frame of video of corresponding importance to adopt the video mode that adapts to bandwidth status (when selecting not abandon any frame; To complete code stream decoding is exactly HD video); Here " frame losing " this operation is exactly that so-called separated frame is encoded a most important step; In fact whole strategy be skip importance low frame of video, keep the high frame of video of importance and transfer to decoder decode.The video mode initial setting is 3 kinds of HD video pattern, SD video mode and mobile device video modes.
The network state estimation module: buffering area A adopted a kind of assessment algorithm of which kind of frame losing strategy after the relevant information that the network state estimation module that is embedded in district end server is actually a kind of network bandwidth that sends over according to buffering area B decided.After estimating network bandwidth seizure condition, be transmitted to buffering area A to selected frame losing strategy, finally realize the frame losing operation by buffering area A.Suppose to exist two threshold values of representing the buffering area utilization rate, when the buffering area utilization rate was in these different three intervals, the frame losing strategy that buffering area A is selected for use was just different so.
Buffering area B: video flowing gets into buffering area B after passing through the RTP/UDP/IP module, and buffering area B realizes two parts functions.First's function is identical with first's function of buffering area A, is mild video flowing transmission; The second portion function is exactly to bear a network state information to smell the function of visiting module, and mainly that buffering area B data occupation rate, current network data packets for transmission Loss Rate, data packet transmission is overtime, packet comes and goes data such as total time and sends to the network state estimation module.
Decoder B:, transform into digital television signal and supply the domestic consumer to use with the video code flow decoding that prior module provided.
Concrete, the network state estimation module is here judging that network bandwidth utilization rate does not surpass first threshold, then feeds back not frame losing strategy to first buffering area; Judge that network bandwidth utilization rate surpasses first threshold, and during less than second threshold value, then feedback abandon synthetic high-definition video signal the enhancement layer frame strategy to first buffering area; Judge when network bandwidth utilization rate surpasses second threshold value, then feedback abandon synthetic SD vision signal the enhancement layer frame strategy to first buffering area.The first threshold here is more than 50%, and first threshold is less than second threshold value, and the first threshold and second threshold value are less than 100%; Such as first threshold can be set is 50%; Second threshold value is 70%, first threshold also can be set be 60%, the second threshold value and be 90% etc.
Accordingly, Fig. 2 shows the district's end network self-adapting video transmission method flow chart in the embodiment of the invention, comprises as follows:
S101: the HDTV video flowing gets into decoder A through district's end gateway, and here all video code flows are all decoded, so that recode afterwards.
S102: decoding back code stream gets into encoder A, unifies the FGS coding.
S103: the video flowing of having encoded is inserted buffering area A, waits for sending through network.And the state information according to the network state estimation module sends over is judged the current frame losing strategy that should adopt.
S104: it is to be decoded that video flowing gets into buffering area B etc. through the RTP/UDP/IP module.Launch network information state simultaneously and smell the spy function, the correlation bandwidth data message is fed back to the network state estimation module of district end server CPU.
S105: the network state estimation module is estimated current network state through buffering area B feedack, and with judged result and next should adopt the decision of frame losing strategy to send to buffering area A.
S106: video flowing entering decoder B decodes to become and can be used for the analog signal that DTV is play.
S107: the DTV domestic consumer carries out video-see.
The module estimation estimate of situation of the data that following Fig. 3 estimates for the network state among the district end server CPU buffering area B is sent, the first threshold here are 70% to describe for example with 50%, the second threshold value;
S301: the network state estimation module is analyzed according to the information that buffering area B provides;
S302: judge that whether network bandwidth utilization rate surpasses 50%, if surpass then carry out S303, if do not surpass then carry out S304;
S303: judge that whether network bandwidth utilization rate surpasses 70%, if surpass then carry out S306, if do not surpass then carry out S305;
S304: not frame losing;
S305: frame losing strategy A: the enhancement layer frame that abandons synthetic high-definition video signal;
S306: frame losing strategy B abandons the enhancement layer frame that synthesizes the SD vision signal.
S307: buffering area A accepts and adopts corresponding frame losing strategy.
More than be that example describes with threshold value 50% and 70%; Certainly the first threshold here can value be the arbitrary value more than 50%, such as 55%, 60% or the like; Second threshold value can be 70%, 75%, 80% or the like value, according to the subzone network environment configurations threshold value is set.
The objective of the invention is provides a kind of adaptive Video transmission system in district's end server, realize that through this Video transmission system the sub-district internal bandwidth is distributed and the vision signal conversion, makes community user at utmost watch video glibly.
More than to what the embodiment of the invention provided, carried out detailed introduction, used concrete example among this paper principle of the present invention and execution mode set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. the network self-adapting Video transmission system is held in a district, it is characterized in that said system comprises:
First decoder is used for the analog video signal that receives is changed into digital signals format;
First encoder is used for received high-definition digital video signal FGS coding;
First buffering area; The video flowing that is used for having encoded is filled into first buffering area; Guarantee the mild transmission of video flowing in network through cushioning certain data volume; And the data of the explanation bandwidth utilization rate state of accepting to send over from the network state estimation module, thereby realize the code check adjustment at coding side, be that means realize bandwidth control with the frame losing;
The network state estimation module, the relevant information of the network bandwidth that is used for sending over according to second buffering area, and confirm to adopt a kind of assessment algorithm of which kind of frame losing strategy to first buffering area;
Second buffering area; Be used for mild video flowing transmission; And bear the function that a network state information is smelt spy, data occupation rate, current network data packets for transmission Loss Rate, data packet transmission is overtime, packet comes and goes total time data and sends to the network state estimation module;
Second decoder, the video code flow that is used for second buffering area is provided is decoded, and transforms into digital television signal and supplies the domestic consumer to use.
2. district as claimed in claim 1 end network self-adapting Video transmission system; It is characterized in that; Said FGS coding is a kind of fine granularity scalable coding techniques that is provided by MPEG-4; Through this coded system video sequence coding is resolved into basic layer bit stream and two code streams of enhancement layer bitstream, basic layer bit stream is to be used to decode form the most basic necessary code stream of video, and enhancement layer bitstream is the code stream that is used to strengthen the required extra increase of video effect; When the decoder reconstructing video flows; Enhancement layer bitstream serves as additional role, and basic layer bit stream decoding just can be satisfied the needs of mobile video, decodes together in conjunction with a part of enhancement layer bitstream and just can satisfy the call format of SD video.
3. district as claimed in claim 1 end network self-adapting Video transmission system; It is characterized in that; Said first buffering area is according to this two parts important information of last free area in the bandwidth occupancy situation of network state estimation module feedback and the buffering area, and first buffering area can select to abandon the lower frame of video of corresponding importance to adopt the video mode of adaptation bandwidth status.
4. district as claimed in claim 3 end network self-adapting Video transmission system is characterized in that, said video mode is HD video pattern or SD video mode or mobile device video mode.
5. like each described district end network self-adapting Video transmission system of claim 1 to 4, it is characterized in that the network state estimation module is judging that network bandwidth utilization rate does not surpass first threshold, then feeds back not frame losing strategy to first buffering area; Judge that network bandwidth utilization rate surpasses first threshold, and during less than second threshold value, then feedback abandon synthetic high-definition video signal the enhancement layer frame strategy to first buffering area; Judge when network bandwidth utilization rate surpasses second threshold value, then feedback abandon synthetic SD vision signal the enhancement layer frame strategy to first buffering area.
6. district as claimed in claim 5 end network self-adapting Video transmission system is characterized in that said first threshold is more than 50%, and first threshold is less than second threshold value, and the first threshold and second threshold value are less than 100%.
7. the network self-adapting video transmission method is held in a district, it is characterized in that said method comprises:
Video flowing is decoded;
Decoded code stream is unified the FGS coding;
The video flowing of having encoded is inserted first buffering area, wait for sending, and judge the current frame losing strategy that should adopt according to the state information of feedback through network;
It is to be decoded that video flowing gets into second buffering area etc., launches network information state simultaneously and smell the spy function, obtains the correlation bandwidth data message;
Estimate current network state according to the correlation bandwidth data message, and judged result and the frame losing strategy decision that next should adopt are fed back to first buffering area;
Decode to become through the video flowing of second buffering area and can be used for the analog signal that DTV is play.
8. district as claimed in claim 7 end network self-adapting video transmission method; It is characterized in that; Saidly estimate current network state, and judged result and the frame losing strategy decision that next should adopt are fed back to first buffering area comprise according to the correlation bandwidth data message:
When judging that network bandwidth utilization rate does not surpass first threshold, then feed back not frame losing strategy to first buffering area;
Judging that network bandwidth utilization rate surpasses first threshold, and during less than second threshold value, then feedback abandon synthetic high-definition video signal the enhancement layer frame strategy to first buffering area;
When judging that network bandwidth utilization rate surpasses second threshold value, then feedback abandon synthetic SD vision signal the enhancement layer frame strategy to first buffering area.
9. district as claimed in claim 8 end network self-adapting video transmission method is characterized in that said first threshold is more than 50%, and first threshold is less than second threshold value, and the first threshold and second threshold value are less than 100%.
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