CN100412832C - Non-homogeneous multi media flow transmission regulation method based on priority regulation - Google Patents
Non-homogeneous multi media flow transmission regulation method based on priority regulation Download PDFInfo
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Abstract
The present invention discloses a network data transmission method, and aims to provide a nonhomogeneous multimedia flow transmission and dispatch method based on priority dispatch. The method comprises: after various information characteristics of multimedia flows are analyzed, the multimedia flows are divided into an audio flow, a figure and image information flow and a video flow; a transmission sequence is established for each multimedia flow; transmission and dispatching management is carried out on the classified multimedia flows, wherein the transmission and dispatching management comprises: a transmission buffer area is established; transmission and dispatch are carried out according to the transmission sequences of the multimedia flows. The present invention uses the effective flow capacity nonuniformity of multimedia information for separating the playing process and the transmission process of the multimedia information, and also fully uses transmission bandwidth. Moreover, multimedia expression priority is defined according to the differences of various multimedia characteristics. Consequently, the present invention reasonably dispatches the transmission process, and ensures the fluent transmission and the representation of multimedia with high priority.
Description
Technical field
The present invention relates to a kind of network data transmission method, more particularly, the present invention relates to a kind of non-homogeneous transmission of multimedia streams dispatching method based on priority scheduling.
Background technology
In Internet transmission information, comprise a large amount of multimedia messagess, as data, text, figure, image, audio frequency, video etc.; And can be divided into downloading mode and stream mode from the mode of information transmission.The Streaming Media transmission is meant: in Internet/Intranet, use the continuous time-base media of stream transmission technology, as: audio frequency, video or multimedia file.Streaming video is not downloaded whole file before broadcast, only will begin partial content deposits internal memory in, and the data stream of streaming video transmits at any time at any time and plays, and some delays are just arranged when beginning.The gordian technique that Streaming Media is realized is transmitted as a stream exactly.Realize that stream transmission has two kinds of methods: real-time streaming transmission (Realtime streaming) and progressive streaming transmission (progressive streaming).
The characteristics of stream media technology: at first, stream media technology is utilized compression coding technology, and video/audio is compressed into packet than low discharge; Secondly, in the media flow transmission process, utilize buffer technology, at first at one section media article of client preload; In playing process, download data problem such as the media play shake that prevents from like this to cause, delay continuously owing to network traffics are unbalanced.
Stream media technology has been avoided downloading complete media material in advance and stand-by period of spending, and stores the required huge memory capacity of whole media material.At present, along with the construction of Broadband Internet net, this technology of Streaming Media has obtained application more and more widely, is applied in fields such as online request, the network teleconference in large quantities.
Because the restriction of network equipment bandwidth at present, for the ordinary Internet network users, even the broadband, stream media technology also can't be transmitted evenly video pictures clearly.But the even property of the mass flow discrepancy that utilizes media information is separated media information playing process and transmission course, utilizes transmission bandwidth fully; And the priority of utilizing the different definition medium performance of various media characteristics, thereby the method that transmission course is carried out rational management is not seen utilization.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of non-homogeneous transmission of multimedia streams dispatching method based on priority scheduling is provided.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The invention provides a kind of non-homogeneous transmission of multimedia streams dispatching method, comprising based on priority scheduling:
Media stream is carried out the media stream information management, wherein said media stream information management comprises and is divided into audio stream, Figure and Image stream and video flowing three classes after various media stream information characteristics are analyzed, and sets up one for each class media stream and send sequence;
Sorted media stream is carried out the transmitting and scheduling management, and wherein said transmitting and scheduling management comprises setting up transmit buffer and sending sequence according to aforementioned media stream carries out transmitting and scheduling;
Described transmission sequence is that audio stream has precedence over Figure and Image stream, and Figure and Image stream has precedence over video flowing again;
The described transmit buffer of setting up is realized in the dispatching system client.
As a kind of improvement, described transmit buffer sends sequence corresponding to each media stream and is based upon the dispatching system client respectively, comprises audio stream data buffer zone, graphic image flow data buffer zone and video stream data buffer zone;
Wherein the audio stream data buffer size is determined according to client memory size, the network bandwidth and congestion condition adjustment by the user by the time length setting; Graphic image flow data buffer zone and video stream data buffer zone are dynamic application capacity buffer zone.
As a kind of improvement, the described transmitting and scheduling that carries out according to media stream transmission sequence comprises:
In very first time section, carry out the transmission of audio stream packet,, successively these packets sent to client by the equal time of dividing data bag at interval, transmitting audio data T.T. length equal the time delay that graphic image stream allows;
After time period in by the transmission of parallel hocket audio stream and Figure and Image stream packets of equal time length, realize the audio stream data buffer zone of client and the foundation of graphic image flow data buffer zone primary data.
As a kind of improvement, the described transmitting and scheduling that carries out according to media stream transmission sequence also comprises:
When carrying out the video streaming data packet transmission, packet data capacity in Network Transmission bandwidth and the video flowing transfer sequence is added up, if video stream data can be finished transmission before wrapping in and playing, and the data time length that the audio stream data buffer zone was preserved when this packet was finished transmission is not less than minimum voice data time span, then carries out the transmission of described video streaming data packet;
If can not in aforementioned time conditions, finish the transmission of video streaming data packet, then next packet data capacity in the video flowing transfer sequence is added up, until finding the packet that meets aforementioned time conditions and transmitting or till the video flowing transfer sequence finishes;
When if the video packets of data transmission is finished, preserve data time length in the audio stream data buffer zone still greater than minimum voice data time span, then proceed the video packets of data transmission, preserve data time length until the audio stream data buffer zone and be less than or equal to minimum voice data time span; Described minimum voice data time span is meant that the audio stream data of preserving in the audio stream data buffer zone have regular hour length, and this time span should guarantee that when network congestion causes data transmission temporarily to be paused audio frequency can smooth playing;
Be less than or equal to minimum voice data time span if the audio stream data buffer zone is preserved data time length, then transfer to carry out audio frequency, graphic image data transmission, fill up the audio stream data buffer zone up to the diaphone audio data.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention utilizes the even property of the mass flow discrepancy of efficient multimedia information, and media information playing process and transmission course are separated, and utilizes transmission bandwidth fully; And according to the priority of the different definition medium of various media characteristics performance, thereby transmission course is carried out rational management, guarantee the smooth and easy transmission and the performance of high priority medium.At recording the media stream program that is separated with playing process, from Streaming Media recipient angle original media stream is carried out montage, thereby can obtain to include the stream program source of effective information.It is uneven, definite that the media stream of this program distributes in time, by multimedia messages is according to priority classified, guarantee the complete transmission of high priority Media Streams such as audio frequency, graph image, simultaneously according to the transmission bandwidth dynamic dispatching, adapt to different network medias such as broadband, dialing, realize the maximum effectively transmission of clear video flowing.
Description of drawings
Fig. 1 handles the overall process block diagram for the media article of an embodiment among the present invention.
Fig. 2 is the multimedia bandwidth distribution plan of an embodiment among the present invention.
Fig. 3 is the diagram of the transmission control procedures of an embodiment among the present invention.
Fig. 4 for embodiment among the present invention at distributed remote education services network application structural drawing.
Fig. 5 is process flow diagram that embodiment uses among the present invention in user's service.
Embodiment
With reference to the accompanying drawings, describe the present invention below in conjunction with an embodiment.
As shown in Figure 1, the analysis stream media article is made and is play whole process, can be expressed as follows:
Original signal is gathered: except that sense of hearing data, the mode that people's vision exchanges both can be passed through video signal collective, also can be by general figures, the image of making in advance, and the click of people on the correlated digital input equipment, became figure when written handwriting produced.Usually, for the real-time demanding relay class medium in scene, or in the real-time, interactive communications, form situation owing to can't predict the flow and the information of following period information, medium can't carry out effective montage, just be combined into multimedia messages in chronological order simply, for example relay of news in real time, interactive video meeting.But, multimedia information stream for online non-at-scene real-time relay, or real-time less demanding interactive communication, as long-distance education, towards disconnected network service etc., before medium are carried out the service of broadcast, there is the sufficient time that multimedia messages is observed, montage, compound, but thereby the Variations in Flow Changes of statistical study Media Stream on the whole broadcast period, or the media information Variations in Flow Changes of one period long duration, permission is in montage, compound tense is set corresponding transmission control mark, in the actual play transmission course, realize Optimization Dispatching, make full use of the network bandwidth, reach band-limited best result of broadcast.
Acceptor according to people's perception information stream divides, and can be divided into vision and sense of hearing two parts, and in multimedia information stream, generally only allows the existence of an audio stream, otherwise can cause the confusion of sound; For the vision part, can there be multiple information flow such as figure, image, video to exist, still according to the characteristics of people's notice, in a time point or segment, people can only accept a kind of or only need accept a kind of visual media.According to concrete media application occasion characteristics, can with in a certain amount of time the visual media information of suitable performing content transmit, and ignore or postpone the transmission of less important Media Stream.
Analyze various multimedia messages features, can obtain their transmission features separately:
The first kind mainly is an audio stream: continuous data, and not discardable, can not postpone during transmission.Audio stream losing in playing process can cause disappearance or the confusion understood, and time reference is incompressible in performing in a radio or TV programme, promptly the audio stream of long period can not be performed in a radio or TV programme within a short period of time, so, must be before performing in a radio or TV programme time point with this timeslice staccato frequently information transmission otherwise can only suspend performing in a radio or TV programme of whole medium to performing in a radio or TV programme client.Such medium have the highest transmission priority.
Second class mainly is information such as figure, image: intermittent data, not discardable, transmission can postpone.Communicating pair or information acceptor receive figure, image information, this category information lose difficulty on can causing understanding, but performing in a radio or TV programme on time reference of they is compressible, promptly allow to play fast, in fact a lot of occasions, performing in a radio or TV programme with time base of figure, image is irrelevant, thereby they can transmits arrival and get final product in the time period of certain hysteresis.
The 3rd class mainly is a video flowing: intermittent data, and discardable.The video scene of taking by video camera is gradual change, and the mankind have the ability by jump scene guess incident complete procedure.For the purpose that conveys a message, be not the video information of continuous whole in time.At montage, compound tense, can observe video information, the shot cut method as the film montage keeps crucial segment, by with the combination of figure, image, both guaranteed the fragment video clips clear, link up, guarantee the transmission of effective video information again.
More than three class media informations, also have characteristics separately from the information flow-rate: audio stream information has big flow, has limit priority, at the different time flow than balance; Figure and Image category information flow minimum have normal priority, but flow suddenlys change; Video stream information flow maximum has lowest priority.Realize that multimedia messages transmission control is exactly the Combinatorial Optimization transmitting and scheduling at this three category information.
The dispatching method step is described in detail:
As Fig. 2, W is the network total bandwidth, and X is the audio stream flow changing curve, and Y is Figure and Image medium flow changing curves, and Z is the streaming video traffic change curve.For simplicity, suppose that here W is the regime flow bandwidth, X is the uniform flux medium, and promptly the medium flow is a constant; Y, Z are flow size variation medium.If it is T that Figure and Image class medium allow maximum-delay
Lim itedIn order to dispatch conveniently, supposing the system is underload situation, that is:
∫W(t)dt＜∫X(t)dt+∫Y(t)dt+∫Z(t)dt
Simultaneously, in order to guarantee the transmission of audio stream and Figure and Image medium, network traffics are essential to be guaranteed:
∫W(t)dt≥∫X(t)dt+∫Y(t)dt
From the characteristic analysis of three Media Stream sequences, each sequence data bag transmission requirement:
Each packet requires to be totally lost at initial broadcast moment forward pass in the audio stream sequence; Each packet requires T after initial broadcast constantly in the Figure and Image stream sequence
Lim itedThe interior transmission allows to postpone to play, and guarantees the transmission of audio stream sequence simultaneously, when packet postpones arrival, can play fast; Video flowing will guarantee audio stream, Figure and Image flow transmission.
In service end is that each class Media Stream is independently set up and sent the stream queue, is respectively audio stream, Figure and Image stream, video flowing, and packet is successively arranged in chronological order, to audio stream, by the equal time of dividing data bag at interval; To graphic image stream and video flowing, because be intermittent discontinuous flow, data continuous in time are constituted a packet, it is the FIFO sequence that is made of above data packet node that medium send the stream sequence.
Set up the individual buffer district that sends sequence corresponding to each respectively in client, wherein the audio stream data buffer size is the buffer zone by the set time length setting, can be by the user according to client stores capacity, the network bandwidth and congestion condition adjustment decision; For the audio stream data buffer zone, establishing buffer zone is T by audio frequency duration calculation capacity
Buf, in order to guarantee the smooth playing of voice data, should preserve the voice data of certain-length in the audio stream data buffer zone, the normal play of audio frequency supposes that this minimum voice data time span is T when causing data transmission temporarily to be paused with assurance because of network congestion
Min buf, general, can establish T
Min buf=T
Buf/ 2.
Graph image flow data buffer zone and video stream data buffer zone are dynamic application capacity buffering, adjust the storage allocation space according to actual amount of data, are kept in the buffer zone to guarantee scheduling back transmission data.
If, set up following transmitting and scheduling flow process with unit interval leaf length T transmission of audio, graphic image data:
At first set up the initial transmission buffer zone: transmit t=0 to t=T
Lim itedData in the interior audio stream;
Parallel alternate transmission audio frequency and graphic image data in the time afterwards, each audio frequency and figure, image data packets timeslice length all are T, fill up client audio stream data buffer zone up to voice data, statistics audio frequency, graphic image data gather average data rate V.
Client begins broadcast program, and this moment, audio stream data buffer zone sound intermediate frequency data playback end time was T '.
When the transmission of beginning video streaming data packet, the Network Transmission bandwidth is added up, and sequential search video transmission sequence, be T as video packets of data reproduction time starting point ", packet size is C
Video, establishing current time is t, as satisfies condition:
1. the assurance packet can be finished transmission before video packets of data is play, promptly
t+C
video/V＜T″
When 2. packet was finished transmission, the data time length that the audio stream data buffer zone is preserved was not less than minimum voice data time span T
Min buf, promptly
t+C
video/V＜T′-T
min?buf
If the current video data bag meets above-mentioned condition, then to select transmission, otherwise abandon this video packets of data, next video packets of data in the sequential search sequence is up to arriving the sequence end or finding qualified video packets of data.
In the follow-up time, as there not being qualified packet in the video sequence, perhaps the data time length of current time audio stream data buffer zone preservation has been less than or equal to T
Min buf, then then the transmission of the audio frequency that hockets, graphic image data is filled up the audio stream data buffer zone up to voice data; When if the video packets of data transmission is finished, preserve data time length in the audio stream data buffer zone still greater than minimum voice data time span, then proceed the video packets of data transmission, preserve data time length until the audio stream data buffer zone and be less than or equal to minimum voice data time span.
The shadow region is for finishing the transmission data among Fig. 3, and current point in time t is indicated by dotted line.
The thought essence of above dispatching method is in the progressive streaming transmission mode, the transmission and the playing process of multimedia information stream can be separated, other according to the different priorities that different medium have, guarantee the punctual transmission of the media information that priority level is high, and at the gap of high priority media delivery transmission low priority Media Stream, and the maximum transmission of realization low level media information.For as application scenarios such as long-distance educations,,, can make full use of the network bandwidth especially, transmit clear video image, guarantee the punctual transmission of high priority medium simultaneously by above-mentioned dispatching algorithm because low priority video stream has intermittence.
Above-mentioned dispatching method is at single program stream, but can with common multicasting schedule method compatibility.
Fig. 4 adopts above-mentioned technology to carry out the long-distance educational system structure of multimedia service.User 31,32,33,34 is for accepting the service machine.Wherein network 300 can be Internet net or LAN (Local Area Network); Center management server 30 is carried out user's login, purview certification function, is user database server simultaneously; With many media servers 37,38,39 that this central server links, be responsible for the transmission service of customer multi-media stream; Monitoring server 35,36 is responsible for customer care billing etc.
The long-distance education multimedia document can be divided into audio frequency, video, figure, image and other ole object resource.Wherein:
Audio frequency, video data: be teacher teach voice and image data, record by recording, video recording equipment;
Graphic documentation: for teacher's writing on the blackboard of teaching, by digitizing sensing equipments such as panel computer (TabletPC) or clipboards, via recording software by a time point time recording position, thus base movement locus when obtaining the pen input;
Image and other ole object:,, be embedded into display surface with the OLE embedded mode as PhotoShop, PowerPoint, Flash etc. by figure, image processing facility and process software made data; For ole object, utilize the calling interface of each software, base transition activities when producing with the OLE server communication based on time base action.
Above data to hard disk, is combined into complete course material by compound, montage software by relevant device and software record support again.
The process that the user accepts to serve can illustrate with Fig. 4: at first, the user logins central server by client-side program, by the database user data verification, enters the service attitude; The user selects relevant program, calculates via the central server balancing the load, is assigned as the media server that this user provides medium to support; On the operation monitoring server, set up charging, monitoring process simultaneously.In case the user withdraws from the service attitude or because certain reason breaks away from network, monitoring server notice central server and media server stop this user's service, and upgrade relevant data recording in central database.
Look audio frequency media server in the system and born by Windows Media Service, the transmission of managing video, audio stream is sent transmission request command by client-side program; Figure, image server are then born by the WindowsIIS server, make host-host protocol with http protocol.System dispatches with dynamical fashion,,, is filed an application to server by the dispatching method decision-making according to the program statistical information by client-side program, finishes the transmission of media stream.
At last, it is also to be noted that what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above examples of implementation, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (4)
1. non-homogeneous transmission of multimedia streams dispatching method based on priority scheduling comprises:
Media stream is carried out the media stream information management, wherein said media stream information management comprises and is divided into audio stream, Figure and Image stream and video flowing three classes after various media stream information characteristics are analyzed, and sets up one for each class media stream and send sequence;
Sorted media stream is carried out the transmitting and scheduling management, and wherein said transmitting and scheduling management comprises setting up transmit buffer and sending sequence according to aforementioned media stream carries out transmitting and scheduling;
Described transmission sequence is that audio stream has precedence over Figure and Image stream, and Figure and Image stream has precedence over video flowing again;
The described transmit buffer of setting up is realized in the dispatching system client.
2. the non-homogeneous transmission of multimedia streams dispatching method based on priority scheduling as claimed in claim 1, it is characterized in that, described transmit buffer sends sequence corresponding to each media stream and is based upon the dispatching system client respectively, comprises audio stream data buffer zone, graphic image flow data buffer zone and video stream data buffer zone;
Wherein the audio stream data buffer size is determined according to client memory size, the network bandwidth and congestion condition adjustment by the user by the time length setting; Graphic image flow data buffer zone and video stream data buffer zone are dynamic application capacity buffer zone.
3. the non-homogeneous transmission of multimedia streams dispatching method based on priority scheduling as claimed in claim 2 is characterized in that, the described transmitting and scheduling that carries out according to media stream transmission sequence comprises:
In very first time section, carry out the transmission of audio stream packet,, successively these packets sent to client by the equal time of dividing data bag at interval, transmitting audio data T.T. length equal the time delay that graphic image stream allows;
After time period in by the transmission of parallel hocket audio stream and Figure and Image stream packets of equal time length, realize the foundation of client audio stream data buffer zone and graphic image flow data buffer zone primary data.
4. the non-homogeneous transmission of multimedia streams dispatching method based on priority scheduling as claimed in claim 3 is characterized in that, the described transmitting and scheduling that carries out according to media stream transmission sequence also comprises:
When carrying out the video streaming data packet transmission, packet data capacity in Network Transmission bandwidth and the video flowing transfer sequence is added up, if video stream data can be finished transmission before wrapping in and playing, and the data time length that the audio stream data buffer zone was preserved when this packet was finished transmission is not less than minimum voice data time span, then carries out the transmission of described video streaming data packet;
If can not in aforementioned time conditions, finish the transmission of video streaming data packet, then next packet data capacity in the video flowing transfer sequence is added up, until finding the packet that meets aforementioned time conditions and transmitting or till the video flowing transfer sequence finishes;
When if the video packets of data transmission is finished, preserve data time length in the audio stream data buffer zone still greater than minimum voice data time span, then proceed the video packets of data transmission, preserve data time length until the audio stream data buffer zone and be less than or equal to minimum voice data time span; Described minimum voice data time span is meant that the audio stream data of preserving in the audio stream data buffer zone have regular hour length, and this time span should guarantee that when network congestion causes data transmission temporarily to be paused audio frequency can smooth playing;
Be less than or equal to minimum voice data time span if the audio stream data buffer zone is preserved data time length, then transfer to carry out audio frequency, graphic image data transmission, fill up the audio stream data buffer zone up to the diaphone audio data.
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| CNB031508081A CN100412832C (en) | 2003-09-02 | 2003-09-02 | Non-homogeneous multi media flow transmission regulation method based on priority regulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100466603C (en) * | 2005-05-17 | 2009-03-04 | 华为技术有限公司 | Method and apparatus for shaping transmission service stream in network |
| CN100440866C (en) * | 2005-10-21 | 2008-12-03 | 清华大学 | Segment transmit dispatch in data-driven overlay network |
| CN100452876C (en) * | 2006-02-24 | 2009-01-14 | 清华大学 | Parallel transmission dispatching method for stream media data |
| CN101425943B (en) * | 2007-10-30 | 2011-08-10 | 中兴通讯股份有限公司 | Method for uplink QoS guarantee in G bit passive optical network system |
| EP2769541A1 (en) * | 2011-10-18 | 2014-08-27 | Unify GmbH & Co. KG | Method and apparatus for providing data produced in a conference |
| CN103841361B (en) * | 2014-03-25 | 2017-01-18 | 山西一建集团有限公司 | Communication method for integrating multiple conference systems under low bandwidth |
| WO2019236296A1 (en) * | 2018-06-07 | 2019-12-12 | Sony Corporation | Network controlled uplink media transmission for a collaborative media production in network capacity constrained scenarios |
| CN111541622A (en) * | 2020-04-17 | 2020-08-14 | 西安万像电子科技有限公司 | Data transmission method and device |
| CN113949674A (en) * | 2020-06-29 | 2022-01-18 | 成都鼎桥通信技术有限公司 | Data transmission method, system, network equipment, media equipment and receiving equipment |
| CN114257820A (en) * | 2020-09-25 | 2022-03-29 | 华为技术有限公司 | Data transmission method and related device |
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