CN1187980C - Video flow sending method for video request via unidirectional coaxial cable in broadcast network - Google Patents
Video flow sending method for video request via unidirectional coaxial cable in broadcast network Download PDFInfo
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- CN1187980C CN1187980C CNB021108099A CN02110809A CN1187980C CN 1187980 C CN1187980 C CN 1187980C CN B021108099 A CNB021108099 A CN B021108099A CN 02110809 A CN02110809 A CN 02110809A CN 1187980 C CN1187980 C CN 1187980C
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Abstract
The present invention relates to a video stream transmission method for realizing videos on demand on a unidirectional coaxial cable of a broadcasting network. The video stream transmission method is characterized in that the video stream transmission method comprises the following steps: a. firstly, program source files are stored on a disk array of a data base of a server; b. the standard video stream of each program source file is uniformly segmented by a segmentation module of the server according to the length of the program time or the content size; c. segment numbers are named for each segment in sequence, and are arranged again; d. a front code stream identification information is established, and is added in front of each segment, and then special video stream containing the front code stream is generated, and is transmitted after being packaged. As the video stream transmission method adopts the technical scheme, the TS stream is defined and packaged again at the front end to form a special code stream, and the video stream transmission method realizes the program interaction and the optional video selection on unidirectional networks.
Description
Technical field
The present invention relates to the tranmission techniques of data flow in field of broadcast televisions, relate in particular to a kind of video flow sending method of on the unidirectional coaxial cable of radio network, realizing video request program.
Background technology
Along with numeral, computer and network technologies are applied to field of broadcast televisions extensively and profoundly, deep variation is taking place in radio and television, and is breeding new intension, and the essence of broadcasting changes.The propagation advantage of broadcasting is ageing strong a, broad covered area but it has the weakness of himself, listen to and watch as transient, order, the propagation advantage of internet then is that ageing strong, global propagation, form are various, free and mutual, it has changed the weakness that broadcast wire spreads through sex intercourse, promptly loses in a twinkle, passively listens to, can not both pictures and texts are excellent, but the internet also has many weakness at present, higher as computer prices, popularity is low, not as television set is had by the whole people as a rule; Network Transmission is subjected to bandwidth constraint speed low, and that transfer voice still has is second poor, pause etc.Thereby Television Broadcasting Network become one of the important means of the propagation of information, and in good time play-on-demand program also becomes the fashion of present development.Existing TV transmission network is the One-to-All Broadcast mode mostly, its information transmitted is limited, realize on the net interactive being difficult to the imagination at One-to-All Broadcast with can be described as of broadcasting of reconnaissance, thereby for realizing resembling some functions of internet, realize interaction with the reconnaissance multicast function, general method is transformed network exactly.One-way broadcasting network is changed into the bidirectional broadcast net, or the return path that utilizes phone sends back the program center with user's selection.
At present information Video service mode has three kinds of single-point broadcasts, multicast, broadcasting:
1, single-point broadcast mode (unicast) in this manner, the user occupies a program passage separately, and program is had completely VCR (video tape recorder) control, broadcast at any time, F.F., rewind down, time-out, puts slowly.But because the network bandwidth is limited, the user that can respond limited (can only tens arrive hundreds of).
2, multicast mode (Multicast), in this manner, several users is owned a program passage together, but program can only linear play, and promptly broadcasts through and through, and the user can not control, and quite preengages broadcast mode.
3, broadcast mode (Broadcast) in this manner, the program passage is equivalent to a cable television program channel, provides program arrangement and time by operator, and all are equipped with the user of STB can program receiving, this method of service, just broadcasting does not have interactivity.
The structure of aforesaid way video flowing is as shown in Figure 1, is made of 188 bytes, comprises stem part and pay(useful) load part; Each stem part is encrypted control, the control of adaptation field, continuous counter and adaptation field formation by sync byte, transmission error indicator, the initial indicating device of pay(useful) load, transmission priority, program identification (pid), transmission.Structure during its transmission as shown in Figure 2.
Therefore, if will make the user can realize interactive broadcasting with reconnaissance, need to increase a large amount of network facilitiess and many server, two-way interaction planter top boxs, this strengthens cost, the equipment complexity, thereby the interactive VOD system of metropolitan area network is difficult to realize.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of video flow sending method of realizing video request program on the unidirectional coaxial cable of radio network for overcoming above-mentioned shortcoming, system cost is reduced, transmission rate is fast, the realization video is broadcast easily with reconnaissance, can enlarge and unlimited dilatation along with the coverage rate of broadcasting and television network.Can realize all that with existing radio network or the bidirectional broadcast net transformed program broadcasts with reconnaissance.
The technical scheme that realizes the object of the invention is: a kind of video flow sending method of on the unidirectional coaxial cable of radio network, realizing video request program, be characterized in, and may further comprise the steps:
A, programs stored source file on the disk array of server database at first;
B, the standard video stream of each program source file evenly is divided into several equal-sized data segments by Pgmtime length or content size by the segmentation module in the server;
C, give every section titled with segment number according to the order of sequence, rearrange;
D, set up code stream identifying information bag, be added on every section front, generate a dedicated video that contains front end code stream identifying information bag and flow through and send after the encapsulation.
Said method, wherein, the transmission of the described dedicated video stream of steps d is meant: the n with the speed of normal play video-voice frequency flow doubly sends this dedicated video stream.
Said method, wherein, 2＜n＜30.
Said method, wherein, comprise that the taking-up data are to the transmission parameter clock PTR of video memory transmission data from buffer described containing in the front end code stream identifying information bag.
Said method, wherein, described transmission parameter clock PTR is drawn at interval by two program clock references (PCR), transmits parameter speed as interior video stream.
The above-mentioned video flow sending method of on the unidirectional coaxial cable of radio network, realizing video request program, wherein, the dedicated video stream method for packing that contains front end code stream identifying information bag in the described d step is: open certain part program source file earlier, take out program clock reference (PCR) values all in this document, and this segmentation place program clock reference (PCR) value is saved in program clock reference (PCR) array in proper order, simultaneously each program clock reference position (address) order hereof is saved in the program clock reference location address array, encapsulate each section then successively as requested, to the packing end.
The above-mentioned video flow sending method of on the unidirectional coaxial cable of radio network, realizing video request program, wherein, whether the encapsulation process of described each section is as follows: determine it is certain section earlier, find this section position hereof then, be between two adjacent program clock references (PCR) array, if, then this one piece of data of source file is read buffering, and adds the identifying information bag, data preparation in transport stream, writing file destination finishes
The above-mentioned video flow sending method of on the unidirectional coaxial cable of radio network, realizing video request program, wherein, described front end code stream identifying information bag is made of 188 bytes, and wherein preceding 4 bytes are stem parts, and back 184 bytes are to adapt to the field part; Each stem part by sync byte, transmit error indicator, the initial indicating device of pay(useful) load, transmit priority, program identification, transmission encrypt control, adapt to field control, continuous counter; Described adaptation field comprises: adapt to field length, discontinuous indicating device, random access indicator, original stream priority indicator, sign, Optional Field and byte of padding.
Above-mentioned video stream transmission method, wherein, described Optional Field comprises: program clock reference (PCR), optional program clock reference (OPCR), splicing countdown, transmission recognition data length, transmission recognition data, adaptation field length, sign and Optional Field.
Above-mentioned video stream transmission method, wherein, described identifying information bag also can be located at the stage casing or the end of each data segment.
Because the present invention has adopted above technical scheme, at front end TS stream is redefined packing, forms a kind of special code stream,, it broadcasts with reconnaissance so that being implemented on the unidirectional network program interaction.
Description of drawings
Concrete characteristic performance of the present invention is further provided by following embodiment and accompanying drawing thereof.
Fig. 1 is the structural representation of a video transmission stream of prior art.
Schematic diagram (part) when Fig. 2 is the video transmission stream of prior art.
Fig. 3 is the structural representation of a video transmission stream of band identifying information bag of the present invention.
Structural representation (part) when Fig. 4 is band identifying information bag video flowing of the present invention transmission.
Fig. 5 is a video flowing method for packing flow chart of the present invention.
Embodiment
A kind of video flow sending method of realizing video request program on the unidirectional coaxial cable of radio network of the present invention is characterized in, may further comprise the steps:
A, programs stored source file on the disk array of server database at first;
B, the standard video stream of each program source file evenly is divided into several equal-sized data segments by Pgmtime length or content size by the segmentation module in the server;
C, give every section titled with segment number according to the order of sequence, rearrange;
D, set up code stream identifying information bag, be added on every section front, generate a dedicated video that the contains front end code stream identifying information bag encapsulation back of flowing through and doubly send with the n of the speed of normal play video-voice frequency flow.2＜n＜30 wherein.
Further describe the present invention below in conjunction with an embodiment:
The combined method of code stream of the present invention is,
1) speed of normal play video-voice frequency flow (as 1.5Mbps) is improved n and doubly download (2＜n＜30)
2) video-voice frequency flow is divided into plurality of sections, arranges then.For example with 40 minutes films, be divided into 20 sections, average program request delay time≤30 seconds be that the code stream table segmenting arrangement of example is as follows:
In the last table, dash area is the time sequence number, and all the other are segment number.The time sequence number is 1 from left to right during broadcast, connects 2 then from left to right, connects 3 from left to right, connects 4 from left to right ..., walk 5 times, having put for 20 sections is a systemic circulation cycle.
Every period download time is 15 seconds, and each section reproduction time is 15 seconds * 8=120 second, and the lattice time of promptly receiving broadcast for 8 little lattice times.
When playing 1 little lattice, can receive other 4 sections, receive segment number≤broadcast segment number+4 and section deposit in STB (set-top box) buffer storage.
3) determine the buffering hop count
Known: motion picture coding standard (MPEG) (motion picture coding standard 1 (MPEG1) 1.5Mbps of the example here, the present invention comprises motion picture coding standard 2 (MPEG2), motion picture coding standard 4 (MPEG4) waits other) downloading rate=1.5Mbps * n, n is a variable, is assumed to be 8 here.Buffer size also is variable, establishes 128MB here; Length of a film L; Segments is K.Then:
Every section buffer time L/K=L
m
Every period download time: L
Under the m=L
m/ n
X=[128MB ÷ 1.5Mb/ second * 8/8] L
m/ n
4) allow the stand-by period in design, average here＜30 seconds, can divide section carefully, buffer memory is deposited hop count also to be increased.Like this stand-by period can reach＜6 seconds.
5) this code stream table is harvesting after 0 section, promptly begins to put 0 section, guarantees to receive 1 section, and can take in 5 sections altogether, receives current segment number＜broadcast section+4.Put 0 section, take out 1 section broadcast from buffer memory, played in order is deposited 5 sections and is put 1 section, will guarantee to regulate and control into played in order, up to a program is finished.
The transmission stream here is 12Mbps, and a physical channel 64QAM can reach 38.5Mbps, 12Mbps * 3=36Mbps.Can realize three tunnel program requests.Along with coding techniques and in conjunction with other method, play way and can improve.
The method that realizes video request program on radio network is normal transport stream (TS stream), convert a kind of special code stream that meets quality television broadcasting DVB-C standard to, in server, carry out this special code stream several roads specific code stream multiplexing, meet after multiplexing the different code stream of holding of DVB-C through one send at a high speed card (＞50Mbps), the special code stream modulation technique of the compound DVB-C of meeting, special code stream is delivered on the radio network.
,, after frequency modulation, demodulation, specific code stream through set-top box (STB) buffering, is restored with a special chip algorithm code stream to its regulation and control special composite bit stream at receiving terminal.
All carry the TS bag of identification VOD information the present invention, all must be the extra separately TS bags that adds, and promptly discern the VOD packets of information.This bag does not have Payload, has only the adaptation field, adapts to field and adds full 184 bytes with byte of padding.
As shown in Figure 3, the video transmission stream of sending method of the present invention is made of 188 bytes, comprises the stem part and adapts to the field part; Each stem part is encrypted control, the control of adaptation field, continuous counter and adaptation field formation by sync byte, transmission error indicator, the initial indicating device of pay(useful) load, transmission priority, program identification (pid), transmission; Described adaptation field comprises: adapt to field length, discontinuous indicating device, random access indicator, original stream priority indicator, sign, Optional Field and byte of padding.Described Optional Field comprises: PCR, OPCR, splicing countdown, transmission recognition data length, transmission recognition data, adaptation field length, sign and Optional Field.
Identifying information of the present invention is packaged in the front end of each data segment, also can be located at the stage casing or the end of each data segment, and as shown in Figure 4, Fig. 4 is the structural representation in video flowing when transmission of band identifying information bag of the present invention.
Fig. 5 is a video flowing method for packing flow chart of the present invention.This method for packing is: set up certain part program source file, take out all program clock reference values in this document, according to program clock reference file is carried out the equal time segmentation, and this segmentation place program clock reference value is saved in the program clock reference array in proper order, simultaneously each program clock reference position (address) order hereof is saved in the array of program clock reference position (address), packs then.If one section (I) of file beginning is 0 section (first section), as a certain section (I) during less than total hop count, the source file taking-up of indication position hereof of program clock reference this moment, segment number adds 1 simultaneously, read source file to buffering, add code stream identifying information bag at this, source data is added in the TS bag (transmission package), write file destination, whether the current position of source file this moment greater than next sector address of source file, if less than, then expression also need continue to read source file to buffering in this section, add code stream identifying information bag, data are continued to be added in the TS bag (transmission package), write file destination.If greater than next sector address of source file, then next section source file is repeated to add the work of code stream identifying information bag, finish greater than the whole packing process of total hop count until segment number.
Receiving terminal receives (TS) transport stream, at first synchronous according to sync byte, judge according to program identification (PID) whether this program identification is needed program identification then, if, then continue to judge whether into adapting to field, if, then judge whether for the identifying information that transmits this program if show that then this bag is the identifying information bag.Program identification (PCR_PID) according to program clock reference judges whether to be the 0th section (first section), if, from (video request program) VOD identifying information bag, read the size that to carry out the internal memory that the video request program recipient need provide, need receive segment number what are, every section great memory headroom of need, if the memory size that need provide provides memory size greater than the recipient, then abandon, promptly can not carry out video request program.Otherwise, according to recipient's memory size and every section required memory size to the internal memory segmentation.Then, store needed section, abandon the section of having play, and continuously each section play according to segment number order from small to large.In order to reduce the processing that receiving terminal carries out in the junction of segmentation, each segmentation of the transport stream (TS) after must guaranteeing to cut begins the place all program clock reference (PCR) field.
The present invention has following advantage:
1, the existing single-point personalization of playing has again the technical characterstic of multicast, and the essence of broadcast mode is arranged again, realizes Broadcasting in video request program.
2, can in limited program, (be determined by the operator) no matter be information, stock, video frequency program, all can Broadcasting with reconnaissance of no space-time restriction, and summary responses.
3, add outer mutual (or interior mutual), can realize securities trading, ecommerce, can send e-mails The Email Internet that surfs the Internet.
4, program occupies the conventional NVOD of radio network bandwidth ratio institute dedicated bandwidth and will lack, and wants tens fens unlike NVOD Clock is waited for, but summary responses.
Claims (7)
1, a kind of video flow sending method of realizing video request program on the unidirectional coaxial cable of radio network may further comprise the steps:
A, programs stored source file on the disk array of server database at first;
B, the standard video stream of each program source file evenly is divided into several equal-sized data segments by Pgmtime length or content size by the segmentation module in the server;
C, give every section titled with segment number according to the order of sequence, rearrange;
D, set up code stream identifying information bag, be added on every section front, generate a dedicated video that contains front end code stream identifying information bag and flow through and send after the encapsulation;
It is characterized in that:
The described method for packing that contains the dedicated video stream of code stream identifying information bag is: open certain part program source file earlier, take out all program clock reference values in this document, and this segmentation place program clock reference value is saved in the program clock reference array in proper order, simultaneously each program clock reference location address hereof is saved in the program clock reference location address array in proper order, encapsulate each section then successively as requested, to the packing end.
2, the video flow sending method of on the unidirectional coaxial cable of radio network, realizing video request program according to claim 1, it is characterized in that, the encapsulation process of described each section is as follows: determine it is certain section earlier, find this section position hereof then, whether be between two adjacent program clock reference arrays, if, then this one piece of data of source file is read buffering, and add the identifying information bag, data preparation in transport stream, is write file destination and finishes.
3, the video flow sending method of on the unidirectional coaxial cable of radio network, realizing video request program according to claim 1, it is characterized in that, described front end code stream identifying information bag is made of 188 bytes, and wherein preceding 4 bytes are stem parts, and back 184 bytes are to adapt to the field part; Each stem part by sync byte, transmit error indicator, the initial indicating device of pay(useful) load, transmit priority, program identification, transmission encrypt control, adapt to field control, continuous counter; Described adaptation field comprises: adapt to field length, discontinuous indicating device, random access indicator, original stream priority indicator, sign, Optional Field and byte of padding.
4, the video flow sending method of on the unidirectional coaxial cable of radio network, realizing video request program according to claim 3, it is characterized in that described Optional Field comprises: program clock reference, optional program clock reference, splicing countdown, transmission recognition data length, transmission recognition data, adaptation field length, sign and Optional Field.
5, the video flow sending method of on the unidirectional coaxial cable of radio network, realizing video request program according to claim 1, it is characterized in that comprise that the taking-up data are to the transmission parameter clock PTR of video memory transmission data from buffer described containing in the front end code stream identifying information bag.
6, the video flow sending method of realizing video request program on the unidirectional coaxial cable of radio network according to claim 5 is characterized in that described transmission parameter clock is drawn at interval by two program clock references, transmits parameter speed as interior video stream.
7, the video flow sending method of realizing video request program on the unidirectional coaxial cable of radio network according to claim 1 is characterized in that described identifying information bag also can be located at the stage casing or the end of each data segment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021108099A CN1187980C (en) | 2002-02-08 | 2002-02-08 | Video flow sending method for video request via unidirectional coaxial cable in broadcast network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021108099A CN1187980C (en) | 2002-02-08 | 2002-02-08 | Video flow sending method for video request via unidirectional coaxial cable in broadcast network |
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| CN1187980C true CN1187980C (en) | 2005-02-02 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8180029B2 (en) * | 2007-06-28 | 2012-05-15 | Voxer Ip Llc | Telecommunication and multimedia management method and apparatus |
| CN101938483A (en) * | 2010-09-03 | 2011-01-05 | 中兴通讯股份有限公司 | Method and system for distributing live broadcast contents |
| CN103186496B (en) * | 2011-12-30 | 2015-10-14 | 孕龙科技股份有限公司 | Data transmission method |
| JP6352931B2 (en) * | 2012-10-11 | 2018-07-04 | サムスン エレクトロニクス カンパニー リミテッド | Apparatus and method for transmitting and receiving multimedia data in a hybrid network |
| CN103152609A (en) * | 2013-01-30 | 2013-06-12 | 深圳市同洲电子股份有限公司 | Data file playing method and related equipment and system |
| CN105450967B (en) * | 2014-07-31 | 2019-05-03 | 杭州海康威视数字技术股份有限公司 | The method and device that video record data are packaged |
| CN104506965B (en) * | 2014-12-08 | 2018-08-14 | 深圳市九洲电器有限公司 | A kind of order method and system |
| CN112487709B (en) * | 2020-11-25 | 2023-11-21 | 江苏科技大学 | Marine diesel engine fault tracing method based on sensitivity analysis |
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