CN102088442B - Vehicle-mounted multimedia information exchange system and method - Google Patents
Vehicle-mounted multimedia information exchange system and method Download PDFInfo
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- CN102088442B CN102088442B CN200910241437.3A CN200910241437A CN102088442B CN 102088442 B CN102088442 B CN 102088442B CN 200910241437 A CN200910241437 A CN 200910241437A CN 102088442 B CN102088442 B CN 102088442B
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Abstract
The invention relates to a vehicle-mounted multimedia information exchange method, which comprises the following steps of: 1, setting a content playing index table in each vehicle-mounted information terminal to ensure that the vehicle-mounted information terminal can control playing of a stored multimedia file; and 2, in the running process of a vehicle, controlling the playing of the multimedia file by using the vehicle-mounted information terminal on the vehicle according to the content playing index table. A vehicle-mounted point-to-point wireless networking technology is adopted and contents are organized in different zones and are exchanged randomly, so that quick exchange and updating of file contents are realized, updating cost of media contents is lowered, coverage rate and timeliness are enhanced, releasing flexibility of media contents is enhanced and the utilization ratio of equipment is increased.
Description
Technical field
The present invention relates to MultiMedia Field, particularly relate to vehicle-mounted multimedia information exchange system and method.
Background technology
Existing vehicle-mounted media content update technology is divided into a generation, two generations and three generation techniques.In a generation technique, when vehicle mounted multimedia content occupation mode is Che Shangyou passenger, the video content initiatively in playout storage; The substitute mode of content mainly changes plug type memory by artificial.Two generation techniques, on the basis of a generation technique, by wireless device interface such as WiFi, change the media content in storage card in vehicle fixed set place wireless transmission.The WiFi wave point of two generation techniques is upgraded to 3G network module interface by three generation techniques, thus renewal media content that can be quick, real-time, even inter cut medium content; But corresponding bring equipment cost high, exist network rent with and communication fee, there is the problems such as policy risk.An existing generation technique needs manually to change memory, and cost is high and coverage rate is low, poor in timeliness; Existing two generation technique WiFi concentration of transmissions, restricted to the operational mode of vehicle; Existing three generation techniques have equipment cost high, have network rent with and communication fee, have the problems such as policy risk.Meanwhile, simply can only control the broadcasting of content file, the controls such as broadcasting time, reproduction time, broadcasting priority and broadcast strategy cannot be accomplished, the demand that the carrying out of the person that can not meet car operation effectively controls further.
Summary of the invention
In order to solve above-mentioned technical problem, provide vehicle-mounted multimedia information exchange system and method, its object is to, realize the controls such as broadcasting time, reproduction time, broadcasting priority and broadcast strategy, reduce the renewal cost of media content, grouping management is carried out to terminal, and the data of statistical appraisal content result of broadcast.
The invention provides vehicle mounted multimedia information switching method, comprising:
Step 1, arranges content and plays concordance list in each board information terminal, for controlling for the broadcasting of board information terminal to the multimedia file that it stores;
Step 2, in the running of vehicle, the board information terminal on this vehicle plays according to content the broadcasting that concordance list controls multimedia file.
Also comprise:
Step 3, selects the board information terminal of specific quantity to implant content update concordance list, for playing concordance list for board information terminal refreshing content in multiple board information terminal;
Step 4, in the process of vehicle operating, when the distance of two cars is within communication range, the board information terminal on this two cars utilizes WLAN to communicate, and exchanging contents upgrades concordance list, makes the content update concordance list on this two cars consistent; Each board information terminal both as the server in WLAN (wireless local area network), again as the client in WLAN (wireless local area network);
Step 5, after board information terminal receives the content update concordance list mated with it, refreshes its content according to content update concordance list and plays concordance list.
In step 1, content is play concordance list and is had unique file name; In step 5, after vehicle on-board information terminal receives the content update concordance list that the file name of playing concordance list with its content mates, refresh its content according to content update concordance list and play concordance list.
In step 1, content plays record corresponding to concordance list storing multimedia, and every bar record has unique filename; Step 3, the record that content update concordance list storing multimedia is corresponding, every bar record has unique filename; In step 5, board information terminal plays the record in concordance list with same file name according to the title refreshing content recorded in content update concordance list.
In step 3, also implant new multimedia file at the board information terminal of this specific quantity, and store record corresponding to this new multimedia file at content update concordance list.
In step 4, the board information terminal on this two cars is determined to need synchronous multimedia file through consultation, and the exchange index matrix table of this multimedia file alternately; Whether the fragment exchanging each multimedia file in index matrix table record content broadcasting concordance list is stored on the board information terminal of this car, and each multimedia file is all divided into multiple fragment;
In step 5, board information terminal calculates the file fragment needing transmission according to the exchange index matrix table on the exchange index matrix table received and this board information terminal, and this file fragment is sent to the board information terminal of the other side, or receive the file fragment that the other side sends, revise the exchange index matrix table that the file fragment of the other side's transmission received is corresponding, to record the file fragment that this board information terminal stores the other side's transmission that this receives simultaneously.
Each board information terminal adds up the broadcast information of each multimedia file, forms statistics; In step 4, this two cars is interaction statistics result also, and covers old statistics by the new statistics of each multimedia file.
Content play concordance list also record life cycle time of multimedia file, number of times life cycle, file whether can with, play priority and broadcast strategy; When multimedia file is all stored in board information terminal, multimedia file can be used, otherwise multimedia file is unavailable; The file of higher priority is preferentially play; Broadcast strategy is that overtime is then no longer play life cycle, the multimedia file exceeding number of times life cycle is no longer play, overtime life cycle or number of times are then no longer play life cycle, overtime life cycle and exceed number of times and then no longer play life cycle, or no matter when all play.
Content update concordance list also records life cycle time of multimedia file, number of times life cycle, it is one or more to play in priority and broadcast strategy.
In step 4, distinguish new statistics and old statistics according to the formation time of statistics.
In step 4, the board information terminal on this two cars is determined to need synchronous multimedia file specifically to comprise through consultation:
Step 41, the board information terminal on this two cars is play concordance list from the content of oneself respectively and is selected the filename of a multimedia file to send to the other side;
Step 42, after the board information terminal on this two cars receives the multimedia file name of the other side's transmission, judges whether the filename that the other side sends is present in the content broadcasting concordance list of oneself, and the result of judgement is sent to the other side;
Step 43, if the multimedia file name only having a side to send is present on the board information terminal on this two cars simultaneously, then has the multimedia file of this multimedia file name as needing synchronous multimedia file; If the multimedia file name that both sides send is present on the board information terminal on this two cars simultaneously, then there is the multimedia file of the multimedia file name correspondence of comparatively small characters string value (having from left to right to compare according to character sequence, until a unequal character judges size again) as needing synchronous multimedia file; If the multimedia file name that both sides send all is not present on the board information terminal on this two cars, then re-start negotiation.
In step 5, board information terminal calculates the file fragment needing transmission according to the exchange index matrix table on the exchange index matrix table received and this board information terminal, and this file fragment is sent to the board information terminal of the other side, or the file fragment receiving the other side's transmission specifically comprises:
Step 51, the exchange index matrix table received and the exchange index matrix table of self are carried out XOR after exchanging index matrix table by both sides, obtain the file fragment that both sides need to exchange;
Step 52, the position of the file fragment exchanged as required separately residing for exchanging in index matrix table produces a random number, and sends to the other side; This random number shows the position residing for file fragment that oneself needs receives or sends;
Step 53, if the random number that both sides produce is identical, then the board information terminal storing this position files fragment sends this file fragment to the other side; If the random number that both sides produce is different, then the board information terminal that there is the file fragment on less random number correspondence position sends this file fragment to the other side.
The invention provides vehicle-mounted multimedia information exchange system, comprise multiple board information terminal:
Content is all set in each board information terminal and plays concordance list, for controlling for the broadcasting of board information terminal to the multimedia file that it stores;
In the running of vehicle, the board information terminal on this vehicle plays according to content the broadcasting that concordance list controls multimedia file.
In multiple board information terminal, the board information terminal of specific quantity is provided with content update concordance list, for playing concordance list for board information terminal refreshing content;
In the process of vehicle operating, when the distance of two cars is within communication range, the board information terminal on this two cars utilizes WLAN to communicate, and exchanging contents upgrades concordance list, makes the content update concordance list on this two cars consistent; Each board information terminal both as the server in WLAN (wireless local area network), again as the client in WLAN (wireless local area network);
Board information terminal, for after receiving the content update concordance list mated with it, refreshes its content according to content update concordance list and plays concordance list.
Content is play concordance list and is had unique file name; After vehicle on-board information terminal receives the content update concordance list that the file name of playing concordance list with its content mates, refresh its content according to content update concordance list and play concordance list.
Content plays record corresponding to concordance list storing multimedia, and every bar record has unique filename; The record that content update concordance list storing multimedia is corresponding, every bar record has unique filename; Board information terminal plays the record in concordance list with same file name according to the title refreshing content recorded in content update concordance list.
Also be provided with new multimedia file content update concordance list in the board information terminal of this specific quantity and store record corresponding to this new multimedia file.
Board information terminal on this two cars is determined to need synchronous multimedia file through consultation, and exchanges the exchange index matrix table of this multimedia file; Whether the fragment exchanging each multimedia file in index matrix table record content broadcasting concordance list is stored on the board information terminal of this car, and each multimedia file is all divided into multiple fragment;
Board information terminal calculates the file fragment needing transmission according to the exchange index matrix table on the exchange index matrix table received and this board information terminal, and this file fragment is sent to the board information terminal of the other side, or receive the file fragment that the other side sends, revise the exchange index matrix table that the file fragment of the other side's transmission received is corresponding, to record the file fragment that this board information terminal stores the other side's transmission that this receives simultaneously.
Each board information terminal adds up the broadcast information of each multimedia file, forms statistics; This two cars also exchanges statistics, and covers old statistics by the new statistics of each multimedia file.
Content play concordance list also record life cycle time of multimedia file, number of times life cycle, file whether can with, play priority and broadcast strategy; When multimedia file is all stored in board information terminal, multimedia file can be used, otherwise multimedia file is unavailable; The file of higher priority is preferentially play; Broadcast strategy is that overtime is then no longer play life cycle, the multimedia file of number of times life cycle is no longer play, overtime life cycle or number of times are then no longer play life cycle, overtime life cycle and exceed number of times and then no longer play life cycle, or no matter when all play.
Content update concordance list also records life cycle time of multimedia file, number of times life cycle, it is one or more to play in priority and broadcast strategy.
Board information terminal distinguishes new statistics and old statistics according to the formation time of statistics.
Board information terminal, also selects the filename of a multimedia file to send to the other side for playing concordance list from the content of oneself; After receiving the multimedia file name of the other side's transmission, judge whether the filename that the other side sends is present in the content broadcasting concordance list of oneself, and the result of judgement is sent to the other side; If the multimedia file name only having a side to send is present on the board information terminal on this two cars simultaneously, then there is the multimedia file of this multimedia file name as needing synchronous multimedia file; If the multimedia file name that both sides send is present on the board information terminal on this two cars simultaneously, then there is multimedia file compared with the multimedia file name correspondence of small characters string as needing synchronous multimedia file; If the multimedia file name that both sides send all is not present on the board information terminal on this two cars, then re-start negotiation.
Board information terminal, for after exchanging index matrix table with the other side, carries out XOR by the exchange index matrix table received and the exchange index matrix table of self, obtains the file fragment that both sides need to exchange; The position of the file fragment exchanged as required residing for exchanging in index matrix table produces a random number, and sends to the other side; This random number shows the position residing for file fragment that oneself needs receives or sends; If the random number that both sides produce is identical, then the board information terminal storing this position files fragment sends this file fragment to the other side; If the random number that both sides produce is different, then the board information terminal that there is the file fragment on less random number correspondence position sends this file fragment to the other side.
The present invention is by adopting vehicle-mounted point-to-point Wireless Network, content fragment tissue and exchanging at random, thus achieve quick exchange and the renewal of file content, greatly reduce the renewal cost of media content, improve coverage rate and ageing, simultaneously owing to have employed strategy and the algorithm arrangement of vehicle grouping management, strengthen the flexibility that media content is thrown in, improve the utilance of equipment, and utilize above-mentioned non real-time contents of media files swap data passage, reverse transfer content play history record, thus quasi real time can be supplied to client's corresponding content broadcasting statistical report form, improve system confidence level.
Accompanying drawing explanation
Fig. 1 is vehicle mounted multimedia message exchange flow figure provided by the invention;
Fig. 2 is that board information terminal provided by the invention consults multimedia file flow chart.
Embodiment
The present invention, for solving the problem, introduces following concept successively:
Content plays concordance list (CPI---Content Playing Index table), and each content file in storage medium (containing needing often to upgrade synchronous system file or database file) has a corresponding record in this form.
Content update concordance list (CUI---Content Updating Index table), each content file in storage medium (containing needing often to upgrade synchronous system file or database file) has a corresponding record in this form.
Grouping CPI and multi version CUI, the CPI that the terminal of different group is corresponding different, CUI only refreshes the CPI of corresponding version.
Design a statistical form file, the content of all corresponding some terminals of each record within certain time period wherein plays statistics, and follow when exchanging this form data between two terminals of data syn-chronization and exchange each other's needs, new data covers legacy data.
Vehicle mounted multimedia switching system is based upon in a non real-time wireless network.Each car-mounted terminal is a node in network.Any two car-mounted terminals, in the dynamic process of title, as long as within both distances 100 meters, will set up a short connection by Wi-Fi wireless network.Consider that IPV4 is to number of network node restricted (256), native system is optimized in Wi-Fi physical layer, adopts and is similar to MAC Address, identify each car-mounted terminal, breach this restriction, may be used for identifying any one terminal.Meanwhile, substantially reduce the time connected between terminal, within the time of Millisecond, can connect fast.
When upgrading CPI (being provided with CPI during at vehicle release), those initial CUI need artificial implantation by CUI in some car-mounted terminal (can select 50 or 10 cars implantation CUI), and then in running, be handed down to other vehicle by those car-mounted terminals.
In network, in order to realize synchronous (renewal of content) of content, common needs provides a content provider as server, and the client to other provides needs synchronous data.But native system is owing to being a non real-time network.Such server cannot be set up.Therefore, each terminal definitions is the node of equity by system, and each node is server and client.After any two terminals connect, content synchronization can be carried out.
After connecting between terminal, carry out authentication procedures, the authentication algorithm of system effectively can stop the access of disabled user.
After both sides' authentication is passed through, enter the synchronous of content.Content synchronization is basic p2p file synchronization technology.Content file is divided into several file sheets, terminal transmits to the other side the file sheet that the other side lacks.Through repeatedly transmitting, content file finally can transfer other each terminal from seed terminals.
The most original content needs manually content to be implanted in some car-mounted terminal, and then in running, be handed down to other vehicle by those car-mounted terminals; As preferred scheme, implant content file when Artificial Intervention CUI.
CPI is as the table of managing content file, and its filename field, synchronous for p2p file, when file synchronization starts, terminal is file reading name from CPI table, enters the synchronizing process of p2p.
P2P file synchronization: terminal both sides read by synchronous content file name (note: if terminal is not same group from respective CPI, respective CPI table may be different, therefore, both sides need from negotiation filename, to guarantee that the CPI of both sides exists this file in showing, otherwise file synchronization cannot be carried out).From EIA table, the corresponding exchange index matrix information of this filename is read according to filename.After terminal reads EIA information, this information is sent to the other side, and after receiving the EIA information of the other side, the EIA EIA of oneself and the other side sent carries out the operation of XOR.Such as: the EIA of certain content file oneself is: EIAarrayOwn [4]={ 1,0,1,0}; The EIA receiving the other side is: EIAarrayPeer [4]={ 0,1,1,1}; The result of XOR is: EIA [4]={ 1,1,0,1}.
According to the result of EIA [4], can determine that both sides have three file sheets to exchange, be respectively EIA [0], EIA [1], EIA [3].For terminal oneself, because EIAarrayOwn [0]=1, EIAarrayOwn [1]=0, EIAarrayOwn [3]=0; So the 0th file sheet sends to the other side, the 1st and the 3rd file sheet receives that the other side sends.After finishing receiving, by the data writing in files of file sheet, meanwhile, if after this file synchronization of EIA. of set corresponding document sheet completes, EIAarrayOwn [4]={ 1,1,1,1}; EIAarrayPeer [4]={ 1,1,1,1}.
In order to realize p2p file synchronization, content need be introduced and play concordance list (CPI), content update concordance list (CUI), exchange index matrix table (EIA).CPI, CUI, EIA are described as follows:
Each terminal local stores and manages a CPI table, in CPI form, each current contents of media files taken up room in storage medium exists as a record (Record), other need the content file of synchronized update, and comprising amusement program request file and Database Systems file also needs to exist in the table as a record.In CPI table distributive property mainly contain content file name, life cycle time, number of times life cycle, file whether can with, play the field such as priority, broadcast strategy.When terminal content playing module is when preparing to play a certain content file, according to content file name (content file name is unique), in CPI table, find out a record corresponding to this file.Each field in record controls this content file and plays.As:
A) life cycle time, the file content exceeding this life cycle is no longer play.
B) number of times life cycle, the file content exceeding this life cycle is no longer play.
C) file availability, can by this field set after file transfer is complete.
D) play priority, have the file of higher priority preferentially to play;
E) broadcast strategy, broadcast strategy divides five kinds of situations, be described below: 1, overtime is then no longer play life cycle, 2, exceed number of times then no longer to play life cycle, 3, overtime life cycle or number of times are then no longer play life cycle, 4, overtime life cycle and exceed number of times and then no longer play life cycle, 5, no matter when can play;
Before play content, first choose the multimedia file of high priority, if the multimedia file of this priority has multiple can broadcasting in turn, then viewing files availability, if available, then according to broadcast strategy, reexamines life cycle time and number of times life cycle.Qualified record, can play.Also other mode can certainly can be adopted when playing, such as first choose the multimedia file of high priority, then the multimedia file of foremost is then come according to the selective sequential of multimedia file, check the broadcast strategy of this multimedia file, reexamine life cycle time and number of times life cycle, all qualified words, finally check availability.
Exchanging every bar record in index matrix table (EIA) is all map (in this also to mean that in CPI table this record lost efficacy and deletes of generation one by one along with the generation of bar file record every in CPI table, in EIA table, this corresponding record is also deleted automatically), there is the critical field showing corresponding file index sequence number with CPI, then a field is used for storing the actual of this record and takies Field Count (being exactly generally the file fragmentation number of presents), Boolean type (Boolean) field whether some log file contents fragments synchronously complete subsequently.
P2P file synchronization is by file fragmentation, presses file sheet and exchange between terminal.When an all of file have data, then this file is complete, shows that this file synchronously completes.Namely the content file that can play is become.If file does not synchronously complete, namely the data of partial document sheet are empty.Can only wait until after meeting with other terminal next time, then carry out the synchronous of file.File sheet through repeatedly terminal room exchanges, and finally can complete the synchronous of whole content file.
Introduce CPI, the Play Control of file can be solved preferably.But cannot upgrade CPI.Upgrading CPI can whole updating CPI, but this strategy can strengthen the volume of transmitted data of terminal room, brings pressure to wireless transmission.In order to reduce volume of transmitted data.Native system proposes the concept of CUI.Go to upgrade CPI by CUI.Obviously, CUI list structure and CPI are substantially identical.CUI issues passage as the instruction of system, can have multiple version.First need to carry out edition comparison and the refreshing of CUI table between two terminal equipments connected, redaction refreshes legacy version, and Flushing success then enters the respective process refreshing CPI form with CUI form, until refresh complete.
CUI version:
Throw in demand according to content, within usual one month, can change a more content playlist (CPI), often revise a CPI, need issue a CUI file, CUI filename is for marking the version number of CUI.As: v1.cui, v2.cui, v3.cui etc.
CUI refreshes CPI:
Read the record in CUI successively.According to content file name, in CPI table, search the record whether record exists this filename.If existed, then upgrade record corresponding to CPI with the record in CUI.If there is no, then this CUI record is inserted in CPI table.
CUI may be used for upgrading CPI, but due to CUI version too much, multiple version can be caused to be present in system, so that the CPI of terminal is inconsistent simultaneously.But the data syn-chronization of system requires that the CPI of each terminal is identical.Consistent in order to ensure CPI.Introduce multi version CUI mechanism.Each car-mounted terminal, in data synchronization process, retains the CUI of all versions.After two car-mounted terminals set up data syn-chronization passage, both sides CUI exchanges each other's needs, and after this, the CUI file of both sides is the same.Next, the CUI of continuous version is refreshed CPI successively.The terminal both sides that connect, according to the CPI after refreshing, carry out the synchronous of Play Control and content file.The demand that end packet can be thrown in by content, selects the terminal quantity of play content.Realize the content that the terminal plays of different group is different.In order to realize this function, CPI is divided into groups.The CPI that the terminal of different group has is different, and the CPI of identical group is identical.CUI is also divided into different groups accordingly.Therefore, each terminal need retain the CUI of all groups, all versions.Car-mounted terminal, after synchronous CUI, namely carries out the refreshing of CPI, as: the CUI that A group terminal selects the CUI of A group to refresh CPI, B group terminal selection B group refreshes CPI, rule according to this, the CPI content difference of different group, thus the terminal plays list controlling different group is different.To reach the effect of grouping.
Content result of broadcast is the problem that content input client is concerned about very much.System is head it off, for each car-mounted terminal, does a statistics to the content play, statistics comprises content file name, content broadcasting time etc., and statistics preserves as file, meanwhile, the content retaining other terminals all is needed to play statistics.Follow when switching statistics between two terminals and exchange each other's needs, for same content, new data covers legacy data.The new and old of data judges the time produced by data.Because system has the adjustment of a clock, so can ensure that the statistics that the new time produces must be new data.
CPI list structure example:
| Filename/index sequence number is first 11 of filename | Life cycle time (my god) | Number of times life cycle | File availability | Play priority | Broadcast strategy | File size | File fragmentation number |
| 20090703001.wmv | 60 | 300 | Y | 2 | 1 | 5,486,680 | 54 |
| 20090703002.wmv | 60 | 300 | N | 1 | 1 | 3,891,548 | 39 |
| 20090705001.swf | 90 | 500 | Y | 2 | 1 | 1,257,115 | 13 |
| 20090705005.wmv | 60 | 300 | Y | 1 | 1 | 24,539,287 | 240 |
| 20090707001.mp3 | 60 | 0 | Y | 0 | 5 | 3,349,393 | 33 |
| 20090707003.mid | 360 | 0 | Y | 0 | 5 | 898,212 | 9 |
| 20090707006.wmv | 60 | 300 | N | 3 | 1 | 12,852,238 | 126 |
| 20090707007.mp3 | 360 | 0 | Y | 0 | 5 | 2,390,239 | 24 |
| 20090707008.mmf | 360 | 0 | Y | 0 | 5 | 728,398 | 8 |
CUI list structure example:
| Filename/index sequence number is first 11 of filename | Life cycle time | Number of times life cycle | Play priority | Broadcast strategy | File size | File fragmentation number |
| 20090703001.wmv | 120 | 300 | 1 | 1 | 5,486,680 | 54 |
| 20090703002.wmv | 120 | 300 | 1 | 1 | 3,891,548 | 39 |
| 20090709001.wmv | 60 | 300 | 1 | 1 | 12,378,389 | 121 |
| 20090709002.wmv | 60 | 300 | 3 | 1 | 9,384,940 | 92 |
| 20090710001.mp3 | 90 | 500 | 2 | 1 | 21,211,598 | 208 |
| 20090710002.mmf | 90 | 500 | 2 | 1 | 15,924,376 | 156 |
CUI refreshes the CPI example after CPI:
| Filename/index sequence number is first 11 of filename | Life cycle time (my god) | Number of times life cycle | File availability | Play priority | Broadcast strategy | File size | File fragmentation number |
| 20090703001.wmv | 120 | 300 | Y | 1 | 1 | 5,486,680 | 54 |
| 20090703002.wmv | 120 | 300 | N | 1 | 1 | 3,891,548 | 39 |
| 20090705001.swf | 90 | 500 | Y | 2 | 1 | 1,257,115 | 13 |
| 20090705005.wmv | 60 | 300 | Y | 1 | 1 | 24,539,287 | 240 |
| 20090707001.mp3 | 60 | 0 | Y | 0 | 5 | 3,349,393 | 33 |
| 20090707003.mid | 360 | 0 | Y | 0 | 5 | 898,212 | 9 |
| 20090707006.wmv | 60 | 300 | N | 3 | 1 | 12,852,238 | 126 |
| 20090707007.mp3 | 360 | 0 | Y | 0 | 5 | 2,390,239 | 24 |
| 20090707008.mmf | 360 | 0 | Y | 0 | 5 | 728,398 | 8 |
| 20090709001.wmv | 60 | 300 | N | 1 | 1 | 12,378,389 | 121 |
| 20090709002.wmv | 60 | 300 | N | 3 | 1 | 9,384,940 | 92 |
| 20090710001.mp3 | 90 | 500 | N | 2 | 1 | 21,211,598 | 208 |
| 20090710002.mmf | 90 | 500 | N | 2 | 1 | 15,924,376 | 156 |
As shown in Figure 1, wherein suppose that board information terminal A and board information terminal B carries out exchange of multimedia information, idiographic flow comprises vehicle mounted multimedia message exchange flow provided by the invention:
Step 101, board information terminal A and board information terminal B greets each other information Hello, establishes a communications link;
Step 102, board information terminal A and board information terminal B exchanges CUI, and the CUI information making the two store is consistent; Can be specifically: both sides exchange each other's needs.
Step 103-step 104, board information terminal A and board information terminal B refreshes respective CPI respectively;
Step 105, board information terminal A and board information terminal B consult to need synchronous content file;
Step 106, carries information terminal A and board information terminal B and exchanges EIA, by the EIA XOR of both sides, determines the file sheet needing to exchange.
Step 107, carries information terminal A and board information terminal B swap file fragment.
The flow process following (with terminal A, terminal B is example) of terminal switch in the WLAN (wireless local area network) used in the present invention:
1), terminal A, terminal B are in not-connected status, respective private data bag of broadcasting with enciphered message;
2), terminal A, terminal B receive private data bag with enciphered message, be decrypted and early stage certification work; For the broadcast data packet that other WIFI equipment received and ap send, can abandon and not process;
3), terminal A, terminal B confirm that the other side is legal terminal and possesses to connect after qualification, and two machines enter connection status;
4), terminal A, terminal B can carry out transfer of data after entering connection status, and the encapsulation of packet adopts self-defining form, can guarantee not by external interference;
5), after upper strata algorithm has exchanged data, can initiatively terminal A, terminal B be disconnected, terminal A, terminal B have been returned to not-connected status.
The present invention, by modifying to originally open WIFI network agreement, to avoid interference, achieves the broadcast between own product, search, machine recognition, connection data transmission and the function that disconnects.Amended WIFI network agreement is not disturbed by the WIFI signal data of miscellaneous equipment, and the data of transmission are also encrypted with self-defining cryptographic protocol, have higher safety and reliability.
In step 105, its detailed process as shown in Figure 2:
Step 201, terminal A and terminal B respectively reads the filename field of record in the CPI table of oneself, therefrom selects a filename to send to the other side filename field of prioritizing selection time nearer file (can).
Whether step 202, after receiving the filename of the other side's transmission, search this filename and exist, and the result of searching is returned to the other side in its CPI.
Step 203, after both sides receive and return results, both sides hold consultation according to preset rule:
If a side finds, the opposing party does not find, then both sides are by the result finding filename that a side selectes and consult as this.
If both sides find, then the filename that both sides select is carried out character string comparison, get smaller for this negotiation result.
If both sides do not find, then this consults unsuccessfully, and both sides reselect filename, again consults.
The detailed process of step 107 is (size of file sheet is fixing, as being fixed as 100K, is filled to 100K less than the file sheet of 100K):
The position of the file sheet that terminal both sides exchange as required, respective generation random number (this random number shows the position of the file sheet that needs exchange), send to the other side, the random number received is compared with the random number oneself produced, get smaller, this which file sheet exchanged of both sides can be arranged.As: terminal A produces random number 5, terminal B and produces random number 3, for terminal A, the random number received is 3, and the smaller getting 5 and 3 liang of numbers is 3. for terminal B, and the random number received is 5, the smaller getting 3 and 5 liang of numbers is 3, because this file sheet exchanged of both sides is the 3rd file sheet.After determining to exchange which file sheet, file sheet sends by transmit leg, after recipient receives file sheet, also enters corresponding file, meanwhile, and corresponding file sheet flag set during EIA corresponding for this file is recorded.
Those skilled in the art, under the condition not departing from the spirit and scope of the present invention that claims are determined, can also carry out various amendment to above content.Therefore scope of the present invention is not limited in above explanation, but determined by the scope of claims.
Claims (20)
1. vehicle mounted multimedia information switching method, is characterized in that, comprising:
Step 1, arranges content and plays concordance list in each board information terminal, for controlling for the broadcasting of board information terminal to the multimedia file that it stores;
Step 2, in the running of vehicle, the board information terminal on this vehicle plays according to content the broadcasting that concordance list controls multimedia file;
Step 3, selects the board information terminal of specific quantity to implant content update concordance list, for playing concordance list for board information terminal refreshing content in multiple board information terminal;
Step 4, in the process of vehicle operating, when the distance of two cars is within communication range, the board information terminal on this two cars utilizes WLAN to communicate, and exchanging contents upgrades concordance list, makes the content update concordance list on this two cars consistent; Each board information terminal both as the server in WLAN (wireless local area network), again as the client in WLAN (wireless local area network);
Step 5, after board information terminal receives the content update concordance list mated with it, refreshes its content according to content update concordance list and plays concordance list.
2. vehicle mounted multimedia information switching method as claimed in claim 1, is characterized in that, in step 1, content is play concordance list and had unique file name; In step 5, after vehicle on-board information terminal receives the content update concordance list that the file name of playing concordance list with its content mates, refresh its content according to content update concordance list and play concordance list.
3. vehicle mounted multimedia information switching method as claimed in claim 2, is characterized in that, in step 1, content plays record corresponding to concordance list storing multimedia, and every bar record has unique filename; Step 3, the record that content update concordance list storing multimedia is corresponding, every bar record has unique filename; In step 5, board information terminal plays the record in concordance list with same file name according to the title refreshing content recorded in content update concordance list.
4. vehicle mounted multimedia information switching method as claimed in claim 3, is characterized in that, in step 3, also implant new multimedia file at the board information terminal of this specific quantity, and store record corresponding to this new multimedia file at content update concordance list.
5. vehicle mounted multimedia information switching method as claimed in claim 4, is characterized in that,
In step 4, the board information terminal on this two cars is determined to need synchronous multimedia file through consultation, and exchanges the exchange index matrix table of this multimedia file; Whether the fragment exchanging each multimedia file in index matrix table record content broadcasting concordance list is stored on the board information terminal of this car, and each multimedia file is all divided into multiple fragment;
In step 5, board information terminal calculates the file fragment needing transmission according to the exchange index matrix table on the exchange index matrix table received and this board information terminal, and this file fragment is sent to the board information terminal of the other side, or receive the file fragment that the other side sends, revise the exchange index matrix table that the file fragment of the other side's transmission received is corresponding, to record the file fragment that this board information terminal stores the other side's transmission that this receives simultaneously.
6. vehicle mounted multimedia information switching method as claimed in claim 5, it is characterized in that, each board information terminal adds up the broadcast information of each multimedia file, forms statistics; In step 4, this two cars also exchanges statistics, and covers old statistics by the new statistics of each multimedia file.
7. vehicle mounted multimedia information switching method as claimed in claim 6, is characterized in that, content play concordance list also record life cycle time of multimedia file, number of times life cycle, file whether can with, play priority and broadcast strategy; When multimedia file is all stored in board information terminal, multimedia file can be used, otherwise multimedia file is unavailable; The file of higher priority is preferentially play; Broadcast strategy is that overtime is then no longer play life cycle, the multimedia file exceeding number of times life cycle is no longer play, overtime life cycle or number of times are then no longer play life cycle, overtime life cycle and exceed number of times and then no longer play life cycle, or no matter when all play;
Content update concordance list also records life cycle time of multimedia file, number of times life cycle, it is one or more to play in priority and broadcast strategy.
8. vehicle mounted multimedia information switching method as claimed in claim 6, is characterized in that, in step 4, distinguish new statistics and old statistics according to the formation time of statistics.
9. vehicle mounted multimedia information switching method as claimed in claim 5, is characterized in that, in step 4, the board information terminal on this two cars is determined to need synchronous multimedia file specifically to comprise through consultation:
Step 41, the board information terminal on this two cars is play concordance list from the content of oneself respectively and is selected the filename of a multimedia file to send to the other side;
Step 42, after the board information terminal on this two cars receives the multimedia file name of the other side's transmission, judges whether the filename that the other side sends is present in the content broadcasting concordance list of oneself, and the result of judgement is sent to the other side;
Step 43, if the multimedia file name only having a side to send is present on the board information terminal on this two cars simultaneously, then has the multimedia file of this multimedia file name as needing synchronous multimedia file; If the multimedia file name that both sides send is present on the board information terminal on this two cars simultaneously, then there is multimedia file compared with the multimedia file name correspondence of small characters string as needing synchronous multimedia file; If the multimedia file name that both sides send all is not present on the board information terminal on this two cars, then re-start negotiation.
10. vehicle mounted multimedia information switching method as claimed in claim 5, it is characterized in that, in step 5, board information terminal calculates the file fragment needing transmission according to the exchange index matrix table on the exchange index matrix table received and this board information terminal, and this file fragment is sent to the board information terminal of the other side, or the file fragment receiving the other side's transmission specifically comprises:
Step 51, the exchange index matrix table received and the exchange index matrix table of self are carried out XOR after exchanging index matrix table by both sides, obtain the file fragment that both sides need to exchange;
Step 52, the position of the file fragment exchanged as required separately residing for exchanging in index matrix table produces a random number, and sends to the other side; This random number shows the position residing for file fragment that oneself needs receives or sends;
Step 53, if the random number that both sides produce is identical, then the board information terminal storing this position files fragment sends this file fragment to the other side; If the random number that both sides produce is different, then the board information terminal that there is the file fragment on less random number correspondence position sends this file fragment to the other side.
11. vehicle-mounted multimedia information exchange systems, comprise multiple board information terminal, it is characterized in that:
Content is all set in each board information terminal and plays concordance list, for controlling for the broadcasting of board information terminal to the multimedia file that it stores;
In the running of vehicle, the board information terminal on this vehicle plays according to content the broadcasting that concordance list controls multimedia file;
In multiple board information terminal, the board information terminal of specific quantity is provided with content update concordance list, for playing concordance list for board information terminal refreshing content;
In the process of vehicle operating, when the distance of two cars is within communication range, the board information terminal on this two cars utilizes WLAN to communicate, and exchanging contents upgrades concordance list, makes the content update concordance list on this two cars consistent; Each board information terminal both as the server in WLAN (wireless local area network), again as the client in WLAN (wireless local area network);
Board information terminal, for after receiving the content update concordance list mated with it, refreshes its content according to content update concordance list and plays concordance list.
12. vehicle-mounted multimedia information exchange systems as claimed in claim 11, is characterized in that, content is play concordance list and had unique file name; After vehicle on-board information terminal receives the content update concordance list that the file name of playing concordance list with its content mates, refresh its content according to content update concordance list and play concordance list.
13. vehicle-mounted multimedia information exchange systems as claimed in claim 12, is characterized in that, content plays record corresponding to concordance list storing multimedia, and every bar record has unique filename; The record that content update concordance list storing multimedia is corresponding, every bar record has unique filename; Board information terminal plays the record in concordance list with same file name according to the title refreshing content recorded in content update concordance list.
14. vehicle-mounted multimedia information exchange systems as claimed in claim 13, is characterized in that, be also provided with new multimedia file content update concordance list and store record corresponding to this new multimedia file in the board information terminal of this specific quantity.
15. vehicle-mounted multimedia information exchange systems as claimed in claim 14, is characterized in that,
Board information terminal on this two cars is determined to need synchronous multimedia file through consultation, and exchanges the exchange index matrix table of this multimedia file; Whether the fragment exchanging each multimedia file in index matrix table record content broadcasting concordance list is stored on the board information terminal of this car, and each multimedia file is all divided into multiple fragment;
Board information terminal calculates the file fragment needing transmission according to the exchange index matrix table on the exchange index matrix table received and this board information terminal, and this file fragment is sent to the board information terminal of the other side, or receive the file fragment that the other side sends, revise the exchange index matrix table that the file fragment of the other side's transmission received is corresponding, to record the file fragment that this board information terminal stores the other side's transmission that this receives simultaneously.
16. vehicle-mounted multimedia information exchange systems as claimed in claim 15, it is characterized in that, each board information terminal adds up the broadcast information of each multimedia file, forms statistics; This two cars also exchanges statistics, and covers old statistics by the new statistics of each multimedia file.
17. vehicle-mounted multimedia information exchange systems as claimed in claim 16, is characterized in that, content play concordance list also record life cycle time of multimedia file, number of times life cycle, file whether can with, play priority and broadcast strategy; When multimedia file is all stored in board information terminal, multimedia file can be used, otherwise multimedia file is unavailable; The file of higher priority is preferentially play; Broadcast strategy is that overtime is then no longer play life cycle, the multimedia file exceeding number of times life cycle is no longer play, overtime life cycle or number of times are then no longer play life cycle, overtime life cycle and exceed number of times and then no longer play life cycle, or no matter when all play;
Content update concordance list also records life cycle time of multimedia file, number of times life cycle, it is one or more to play in priority and broadcast strategy.
18. vehicle-mounted multimedia information exchange systems as claimed in claim 16, it is characterized in that, board information terminal distinguishes new statistics and old statistics according to the formation time of statistics.
19. vehicle mounted multimedia information switching methods as claimed in claim 15, is characterized in that, board information terminal, also select the filename of a multimedia file to send to the other side for playing concordance list from the content of oneself; After receiving the multimedia file name of the other side's transmission, judge whether the filename that the other side sends is present in the content broadcasting concordance list of oneself, and the result of judgement is sent to the other side; If the multimedia file name only having a side to send is present on the board information terminal on this two cars simultaneously, then there is the multimedia file of this multimedia file name as needing synchronous multimedia file; If the multimedia file name that both sides send is present on the board information terminal on this two cars simultaneously, then there is multimedia file compared with the multimedia file name correspondence of small characters string as needing synchronous multimedia file; If the multimedia file name that both sides send all is not present on the board information terminal on this two cars, then re-start negotiation.
20. vehicle mounted multimedia information switching methods as claimed in claim 15, it is characterized in that, board information terminal, for after exchanging index matrix table with the other side, the exchange index matrix table received and the exchange index matrix table of self are carried out XOR, obtains the file fragment that both sides need to exchange; The position of the file fragment exchanged as required residing for exchanging in index matrix table produces a random number, and sends to the other side; This random number shows the position residing for file fragment that oneself needs receives or sends; If the random number that both sides produce is identical, then the board information terminal storing this position files fragment sends this file fragment to the other side; If the random number that both sides produce is different, then the board information terminal that there is the file fragment on less random number correspondence position sends this file fragment to the other side.
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| CN1822976A (en) * | 2003-07-16 | 2006-08-23 | 国立运输安全研究所 | Device and method for positioning and controlling railway vehicles with ultra-large bandwidth |
| CN1929637A (en) * | 2005-09-07 | 2007-03-14 | 通用汽车环球科技运作公司 | Vehicle-to-vehicle communication |
| CN101378343A (en) * | 2008-03-07 | 2009-03-04 | 华中科技大学 | System and method for implementing speedway vehicle wideband communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822976A (en) * | 2003-07-16 | 2006-08-23 | 国立运输安全研究所 | Device and method for positioning and controlling railway vehicles with ultra-large bandwidth |
| CN1929637A (en) * | 2005-09-07 | 2007-03-14 | 通用汽车环球科技运作公司 | Vehicle-to-vehicle communication |
| CN101378343A (en) * | 2008-03-07 | 2009-03-04 | 华中科技大学 | System and method for implementing speedway vehicle wideband communication |
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