CN1276662C - Broadcast type VOD system based on multicast and request method thereof - Google Patents
Broadcast type VOD system based on multicast and request method thereof Download PDFInfo
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Abstract
The present invention discloses a broadcasting type video requesting system based on multicast and a requesting method. The broadcasting type video requesting system is characterized in that the system comprises a program source, at least one program packaging system, a magnetic disk array, at least one front-end playing device and multiple reception and playback devices. The method comprises the steps that a program is made into a plurality of program files to form the program source which is output to the program packaging device; a program file installing time segment is segmented, recombined and packaged into a program packaging file which is stored to the magnetic disk array; the program packaging file which is stored in the magnetic disk array and waits to be extracted by the front-end playing device; the program packaging file is extracted from the magnetic disk array and is played to the network in a multicasting or broadcasting mode; the reception and playback devices receive the program packaging file and carry out operation for relieving the packaging. For all the users requesting the same program, the same program source is shared at different requesting time. The present invention can effectively solve the bottleneck problems of data throughput, network bandwidth and magnetic array.
Description
Technical field
The present invention relates to a kind of broadcast type video on-demand system and order method thereof based on multicast.
Background technology
Along with the Internet development of internet technology, people are not only transmitted text, thirst for realizing obtaining of video multimedia information on network that with it people's demand can be progressively satisfied in the development of video on demand techniques just.
Based on the video on demand techniques of ICP/IP protocol, utilize multicast mode to play same video flowing and supply all users of local area network (LAN) of appointment to watch that it can save bandwidth resources, but the user can not can't satisfy the requirement of people's personalization with point with seeing.
Quasi-video request program technology (NVOD) is exactly the notion that wheel is broadcast, a complete video flowing (as 120 minutes film) is cut into many sections at the online multicast of TCP/IP, flow then that the stand-by period is 12 minutes if be cut into 10, user on the local area network (LAN) is watched, but it is to be prerequisite to sacrifice bandwidth, and user's stand-by period also can not bear.
Tradition VOD system configuration comprises VOD server 11, storage device 12, clock 13 and a plurality of playback terminal 14-1～14-n as shown in Figure 1.Each playback terminal 14-1～14-n and 13 two-way connections of clock, clock 13 and 11 two-way connections of VOD server, VOD server 11 is connected with storage device 12.Video on demand techniques (VOD) be with program storage in server, the user have demand then server send video flowing according to request, with personalized requirements, the network in the high server of this Technology Need, jumbo disk, broadband, with regard to existence conditions, number of users also can only be limited in more than 500 users, otherwise can cause the obstruction of network.
Video on-demand system was according to each some broadcasting user request in the past, for each user's broadcast items and distribute bandwidth, each all needs independent program source, bandwidth and reproducer these broadcasting users, causes resource contention, has limited the development of video on demand techniques on IP network.When a broadcasting user increases, just can't normally move, and make the cost of serving of video request program high.
Summary of the invention
Purpose of the present invention is exactly to solve that network bandwidth bottleneck, device data that video on-demand system exists are handled up bottleneck, disk array bottleneck problem and a kind of broadcast type video on-demand system and the order method thereof based on multicast that propose, this technology can be saved the server cost, the program request stand-by period is short, number of users is not limit, really satisfy the personalized requirement of people, thereby under the prerequisite that guarantees service quality, effectively reduced cost of serving.
Realize that technical measures of the present invention are,
A kind of broadcast type video on-demand system based on multicast is characterized in, comprises program source, at least one program packaging system, disk array, at least one front end broadcast device and a plurality of reception playback reproducer;
Described program source is used for program is made a plurality of program file, and program file is outputed in the program packaging system;
Described program packaging system is used for the section segmentation reorganization of program file set-up time and is packaged into the program package file remaining to disk array;
Described disk array is used for the programs stored package file, and waits for that the front end broadcast device takes out;
Described front end broadcast device is used for taking out the program package file from disk array and broadcasts network with multicast mode;
The described playback reproducer that respectively receives is used for program receiving package file from the corresponding network passage, and carries out the decapsulation operation.
Above-mentioned a kind of broadcast type video on-demand system based on multicast, wherein, described program packaging system comprises memory, program encapsulation unit, and described memory is in order to storing a plurality of program block, and each program block is delivered to carry out the program encapsulation unit in the program encapsulation unit; Described program encapsulation unit is saved in the disk array after program block is encapsulated.
Above-mentioned a kind of broadcast type video on-demand system based on multicast, wherein, described reception playback reproducer comprises receiver module, receives buffer module, decapsulation module, play buffering module and playback module;
Described receiver module response user operation, program receiving package file from the corresponding network passage, and store into and receive in the buffer module;
Described decapsulation module is taken out the program package file from receive buffer module, carry out the decapsulation operation, starts anew to export program file to the play buffering module;
Program file in the described playback module playback playout buffer module.
A kind of broadcast type VOD method based on multicast is characterized in, may further comprise the steps:
A, program is made a plurality of program file form program source, and program file is outputed in the program packaging system;
B, by the program packaging system with program file set-up time section segmentation reorganization and be packaged into the program package file and remain to disk array;
C, in disk array the programs stored package file, and wait for that the front end broadcast device takes out;
D, be used for taking out the program package file by the front end broadcast device and broadcast network with multicast mode from disk array;
E, receive playback reproducer program receiving package file from the corresponding network passage, and carry out the decapsulation operation by each.
Above-mentioned a kind of broadcast type VOD method based on multicast, wherein, the program encapsulation described in the step a comprises two steps:
A-1, the original document program block is pressed sort method reorganize ordering, be stored in the memory;
A-2, on reorganizing the program block of ordering, each adds the block message sign.
Above-mentioned a kind of broadcast type VOD method based on multicast, wherein, the described sort method of step a-1 may further comprise the steps:
A-1-1, at first each program source is divided into the m piece, and successively titled with symbol 0,1,2,3 ..., m;
A-1-2,0 program block is put in the first place, the certain piece in every thereafter interval is counted recirculation and is occurred;
A-1-3, other program block n should occur in the piece number within the W/BR ratio behind the position that the n-1 piece occurs; Wherein BR is the program code check, and W is the program occupied bandwidth;
A-1-4, till all program block of protopodium purpose occur once at least.
Above-mentioned a kind of broadcast type VOD method based on multicast, wherein, the described certain piece number of step a-1-2 can be determined by application person oneself, is generally the natural number greater than 4, this natural selection program request that has the greatest impact postpones.It is 0 program block that sequence number also can be arranged in the middle of the described certain piece number of step a-1-2.
Above-mentioned a kind of broadcast type VOD method based on multicast, wherein, the described W/BR ratio of step a-1-3 is got the integer greater than 1.
Above-mentioned a kind of broadcast type VOD method based on multicast, wherein, the described block message sign of step a-2 is made of 8 bytes.
Above-mentioned a kind of broadcast type VOD method based on multicast, wherein, the described reception playback of step e may further comprise the steps:
E-1, receiver module response user operation, program receiving package file from the corresponding network passage, and store into and receive in the buffer module;
E-2, decapsulation module are taken out the program package file from receive buffer module, carry out the decapsulation operation, start anew to export program file to the play buffering module;
Program file in e-3, the playback module playback playout buffer module.
Because the present invention has adopted above technical measures, can solve broadcast system data throughput bottleneck problem, network bandwidth bottleneck problem, disk array bottleneck problem in the video on-demand system effectively.Concerning all users of program request same program, be regardless of the program request time, all share same program source.The maximum program request of some broadcasting user postpones to be no more than 48 seconds, and the program request number of users is unrestricted, and the program request time is unrestricted.
Description of drawings
Concrete characteristic performance of the present invention is further provided by following embodiment and accompanying drawing thereof.
Fig. 1 is traditional VOD system configuration schematic diagram.
Fig. 2 is the video on-demand system structural representation that the present invention is based on the main broadcaster.
Fig. 3 is a program packaging system schematic diagram of the function of the present invention.
Fig. 4 is that the present invention receives the playback reproducer schematic diagram.
Fig. 5 is a broadcast type VOD method of the present invention.
Fig. 6 is one embodiment of the invention structural representation.
Embodiment
Broadcast type video on-demand system of the present invention comprises program storage, program broadcast, response request and programme replay.
See also Fig. 2.A kind of broadcast type video on-demand system based on multicast comprises program source 21, at least one program packaging system 22, disk array 23, at least one front end broadcast device 24 and a plurality of reception playback reproducer 25; Program source 21 is used for program is made a plurality of program file, and program file is outputed in the program packaging system 22; Program packaging system 22 is used to install the program canned software, and the section segmentation of program file set-up time is recombinated and is packaged into the program package file remains to disk array 23; Disk array 23 is used for the programs stored package file, and waits for that front end broadcast device 24 takes out, and in system of the present invention, disk array also can be large capacity digital storage devices such as IDE hard disk.Front end broadcast device 24 is used for taking out the program package file from disk array 23 and broadcasts network A with multicast mode; Each receives playback reproducer 25 and is used for program receiving package file from the corresponding network passage, and carries out the decapsulation operation.
See also Fig. 3, program packaging system 22 comprises memory 221, program encapsulation unit 222, wherein: memory 221 is in order to storage original program file, and it can be regarded as a plurality of program block of continuous storage, and according to the sort method of necessity each program block is delivered to and to be carried out the program encapsulation in the program encapsulation unit 222, and then be saved in the disk array 23.This method for packing guarantees that the program The initial segment can both occur in any tens second transmission time, and guarantees that each section can both occur before broadcast time, comprises by time segmentation module and reorganization package module.
The buffer size of the sort method of described necessity and the length of original document, code check, reception playback terminal, and Internet communication speed is relevant, it comprises two steps:
A-1, the original document program block is pressed sort method reorganize ordering, be stored in the memory;
A-2, on reorganizing the program block of ordering, each adds the block message sign.
Wherein, the described sort method of step a-1 may further comprise the steps:
A-1-1, at first each program source is divided into the m piece, and successively titled with symbol 0,1,2,3 ..., m;
A-1-2,0 program block is put in the first place, the certain piece in every thereafter interval is counted recirculation and is occurred; Certain piece number can be determined by application person oneself, is generally the natural number greater than 4, this natural selection program request delay that has the greatest impact.It is 0 program block that sequence number also can be arranged in the middle of certain piece number.
A-1-3, other program block n should occur in the piece number within the W/BR ratio behind the position that the n-1 piece occurs; Wherein BR is the program code check, and W is the program occupied bandwidth; This W/BR ratio is got the integer greater than 1.
A-1-4, till all program block of protopodium purpose occur once at least.
For any reception playback terminal, for example for 50 minutes, the original program stream file of 1Mbps, its maximum program request postpones to be no more than 60 seconds, its original program file is divided into 51 by length, 0,1,2 of the sequence numbers that gives successively ..., 50 pieces be respectively each piece physical storage locations of original program document order.If receive the playback terminal buffering 128MB is arranged, this program stream takies the bandwidth of 7Mbps in network, then according to sort method of the present invention, then with all program block ordering as following form:
0，0，50，36，35，1， 19；
0，9，6， 3， 2， 20，1；
0，49，38，37，21，3， 1；
0，10，5， 4， 22，2， 1；
0，40，39，23，7， 5， 1；
0，24，11，6， 3， 2， 1；
0，46，42，41，25，7， 1；
0，12，8， 26，4， 2， 1；
0，44，43，27，9， 3， 1；
0，28，13，10，5， 2， 1；
0，45，30，29，14，11，1；
0，12，6， 4， 3， 2， 1；
0，48，47，33，31，13，1；
0，32，15，14，7， 2， 1；
0，16，17，15，5， 3， 1；
0，34，18，8， 4， 2， 1。
Encapsulation process is according to sort method original document program block ordering back to be reorganized, and will add the block message sign to each program block simultaneously, adds 8 bytes at this program build,
| 0×47 | 0×47 | Piece number | Piece number | Program block length |
0 * 47 is the build mark, and immediately following the piece of two bytes number, the back accounts for 4 bytes with program block length, represents the byte number of this piece, behind the build immediately following the initial data of this piece.Be used to identify program and begin to finish for number the highest 4 of the piece of two bytes.
Please participate in Fig. 4, receive playback reproducer 25 and comprise receiver module 251, receive buffer module 252, decapsulation module 253, play buffering module 254 and playback module 255.Wherein: the 251 response users operations of described receiver module, program receiving package file from the corresponding network passage, and store into and receive in the buffer module 252; Decapsulation module 253 is taken out the program package file from receive buffer module 252, carry out the decapsulation operation, starts anew to export program file to play buffering module 254; Program file in the playback module 255 playback playout buffer modules 254 then.The broadcast of each program package file all be circulation, at a high speed, just wheel is broadcast technology at a high speed.Cooperate any user of local interaction technique guarantee who receives playback reproducer to share same program source.Any user of the same program of program request shares same program package file, although their program request time has nothing in common with each other, playback in a short period of time can both start anew.
After local interaction is meant that receiving playback terminal receives data, at first seek build information 0 * 47,0 * 47 byte, extract piece information and this block length information then, program block for the needs storage, receive playback terminal and open up this blocks of data of buffer-stored according to block length information, need store the buffering that is received playback terminal as for which program block of judgement influences.If buffering can be stored m piece program, and the current n program block of playing, then number all to store less than m+n and greater than the program block of n for piece, program block for other piece number then abandons, and then discharges this memory block after the n program block finishes playing, and plays the n+1 program block, finish up to playing programs, perhaps receive playback terminal because user intervention empties buffering, leave the program request passage.
So-called decapsulation operation can be understood as 8 block of bytes labeling heads of program receiving stream are removed.
Below be system of the present invention and prior art systems performance comparison table at 10Mbps network program request MPEG1 program:
| The NVOD system | The VOD system | Native system | |
| Number of users | Do not limit | ＜60 | Do not limit |
| Program request postpones | ＞5 minutes | ＜5 seconds | ＜48 seconds |
| The server performance requirement | Generally | High | Generally |
| The playback terminal requirement | Generally | Generally | Internal memory＞128MByte |
| Interactive mode | One | Network | Local |
| The network blockage chance | Generally | High | Do not have |
| Image quality | Stable | Unstable | Stable |
A kind of broadcast type VOD method based on multicast of the present invention may further comprise the steps:
A, program is made a plurality of program file form program source, and program file is outputed in the program packaging system; This program encapsulation comprises two step: a-1, a plurality of program block of storage in memory; A-2, each program block delivered to carry out program encapsulation in the program encapsulation unit.
B, by the program packaging system with program file according to time period segmentation reorganization and be packaged into the program package file and remain to disk array;
C, in disk array the programs stored package file, and wait for that the front end broadcast device takes out;
D, be used for taking out the program package file by the front end broadcast device and broadcast network with multicast mode from disk array;
E, receive playback reproducer program receiving package file from the corresponding network passage, and carry out the decapsulation operation by each.This reception playback may further comprise the steps: e-1, receiver module response user operation, and program receiving package file from the corresponding network passage, and store into and receive in the buffer module; E-2, decapsulation module are taken out the program package file from receive buffer module, carry out the decapsulation operation, start anew to export program file to the play buffering module; Program file in e-3, the playback module playback playout buffer module.
Broadcast type VOD method based on multicast, broadcasting server circulates at a high speed and broadcasts packaged program stream, shown in Figure 5 is exactly the program stream of multicast on the network, this program stream is the closed loop of a circulation, the circulation of a closure is exactly through a packaged program stream of program encapsulation unit, receive playback terminal for any one, this program of program request at any one time, because this encapsulation guarantees the program The initial segment and can both occur in any tens second transmission time, therefore the maximum delay of this program request terminal has only tens seconds, may not postpone yet, therefore this method for packing guarantees that each section can both occur before broadcast time simultaneously, has guaranteed that the reception playback terminal can play this program glibly.
See also Fig. 6, the present invention is further described below in conjunction with an embodiment:
Simple embodiment comprises a station server, and PENTUM4 joins CD-ROM, network interface card, and 30G IDE hard disk, the 128M internal memory is installed WIN2000 operating system, the program canned software is installed and is broadcasted software; The 100M IP network; Many playback terminal PC, PENTUM3, network interface card, the 10G hard disk, the 128M internal memory is installed WIN2K operating system, installs to receive playout software; The program canned software reads the program media file in CD-ROM or the hard disk, be saved in the IDE hard disk after the encapsulation, broadcast software and from hard disk, read the program package file, multicast on the network, the reception playout software of playback terminal, program receiving package file to the network channel of appointment carries out decapsulation, the reduction program file is come out from first program file playback again.Wherein the parameter of network channel can be passed through manual configuration, also can pass through upward signal, inquiry program broadcasting server, the broadcast channel parameters of acquisition request program.
Claims (10)
1, a kind of broadcast type video on-demand system based on multicast is characterized in that, comprises program source, at least one program packaging system, disk array, at least one front end broadcast device and a plurality of reception playback reproducer;
Described program source is used for program is made a plurality of program file, and program file is outputed in the program packaging system;
Described program packaging system is used for the section segmentation reorganization of program file set-up time and is packaged into the program package file remaining to disk array;
Described disk array is used for the programs stored package file, and waits for that the front end broadcast device takes out;
Described front end broadcast device is used for taking out the program package file from disk array and broadcasts network with multicast mode;
The described playback reproducer that respectively receives is used for program receiving package file from the corresponding network passage, and carries out the decapsulation operation.
2, a kind of broadcast type video on-demand system according to claim 1 based on multicast, it is characterized in that, described program packaging system comprises memory, program encapsulation unit, described memory is in order to storing a plurality of program block, and each program block delivered to carry out the program encapsulation unit in the program encapsulation unit; Described program encapsulation unit is saved in the disk array after program block is encapsulated.
3, a kind of broadcast type video on-demand system based on multicast according to claim 1 is characterized in that, described reception playback reproducer comprises receiver module, receives buffer module, decapsulation module, play buffering module and playback module;
Described receiver module response user operation, program receiving package file from the corresponding network passage, and store into and receive in the buffer module;
Described decapsulation module is taken out the program package file from receive buffer module, carry out the decapsulation operation, starts anew to export program file to the play buffering module;
Program file in the described playback module playback playout buffer module.
4, a kind of broadcast type VOD method based on multicast is characterized in that, may further comprise the steps:
A, program is made a plurality of program file form program source, and program file is outputed in the program packaging system;
B, by the program packaging system with program file set-up time section segmentation reorganization and be packaged into the program package file and remain to disk array;
C, in disk array the programs stored package file, and wait for that the front end broadcast device takes out;
D, be used for taking out the program package file by the front end broadcast device and broadcast network in the mode of multicast or broadcasting from disk array;
E, receive playback reproducer program receiving package file from the corresponding network passage, and carry out the decapsulation operation by each.
5, a kind of broadcast type VOD method based on multicast according to claim 4 is characterized in that, the program encapsulation described in the step a comprises two steps:
A-1, the original document program block is pressed sort method reorganize ordering, be stored in the memory;
A-2, on reorganizing the program block of ordering, each adds the block message sign.
6, a kind of broadcast type VOD method based on multicast according to claim 5 is characterized in that the described sort method of step a-1 may further comprise the steps:
A-1-1, at first each program source is divided into the m piece, and successively titled with symbol 0,1,2,3 ..., m;
A-1-2,0 program block is put in the first place, the certain piece in every thereafter interval is counted recirculation and is occurred;
A-1-3, other program block n should occur in the piece number within the W/BR ratio behind the position that the n-1 piece occurs; Wherein BR is the program code check, and W is the program occupied bandwidth;
A-1-4, till all program block of protopodium purpose occur once at least.
7, a kind of broadcast type VOD method based on multicast according to claim 6 is characterized in that, the described certain piece number of step a-1-2 can be determined by application person oneself, be generally the natural number greater than 4; It is 0 program block that sequence number also can be arranged in the middle of this certain piece number.
8, a kind of broadcast type VOD method based on multicast according to claim 6 is characterized in that, the described W/BR ratio of step a-1-3 is got the integer greater than 1.
9, a kind of broadcast type VOD method based on multicast according to claim 5 is characterized in that, the described block message sign of step a-2 is made of 8 bytes.
10, a kind of broadcast type VOD method based on multicast according to claim 4 is characterized in that, the described reception playback of step e may further comprise the steps:
E-1, receiver module response user operation, program receiving package file from the corresponding network passage, and store into and receive in the buffer module;
E-2, decapsulation module are taken out the program package file from receive buffer module, carry out the decapsulation operation, start anew to export program file to the play buffering module;
Program file in e-3, the playback module playback playout buffer module.
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| CN 03116653 CN1276662C (en) | 2003-04-28 | 2003-04-28 | Broadcast type VOD system based on multicast and request method thereof |
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| CN100384252C (en) * | 2005-06-15 | 2008-04-23 | 北京交通大学 | Method for implementing video request program under cover network multicasting |
| WO2008002296A1 (en) * | 2006-06-27 | 2008-01-03 | Thomson Licensing | Support for interactive playback devices for performance aware peer-to-peer video-on-demand service |
| CN101090546B (en) * | 2007-07-24 | 2011-05-11 | 中兴通讯股份有限公司 | Method and system for implementing communication terminal service switchover |
| CN101399690B (en) * | 2007-09-28 | 2011-05-11 | 中国科学院软件研究所 | Multimedia data transmission method and system thereof |
| CN102710969B (en) * | 2012-05-31 | 2015-02-11 | 北京冠华天视数码科技有限公司 | Method and system for transmitting live broadcast data through wireless network |
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