CN102098569B - Segment data distributing system of PSI/SI (program specific information/service information) table of digital television set top box and method thereof - Google Patents
Segment data distributing system of PSI/SI (program specific information/service information) table of digital television set top box and method thereof Download PDFInfo
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Abstract
The invention discloses a segment data distributing system of a PSI/SI (program specific information/service information) table of a digital television set top box. The system comprises a demux module, wherein the demux module receives a digital television TS (timing sequence) stream to form into a corresponding segment data packet according to a request of a user, the system is characterized in that the demux module is sequentially connected with a segment processing module and a buffer module, and the demux module is used for tossing the segment data packet to the segment processing module to be processed; and the segment processing module stores a segment data packet queue tossed by the demux module in an internal memory opening space of the set top box, builds the buffer module according to a table number of the segment data packet, stores the segment data packet of the ID (integral derivative) and the PID (proportion integral derivative) of the same PSI/SI table, processes the segment data packet in a splicing way, cancels the redundant information, forms the spliced segment data into a final PSI/SI table, and transmits the final PSI/SI table to the user. The processing capability of the set top box to the section data is improved.
Description
Technical field
The invention belongs to the DTV communication technique field, be specifically related to a kind of segment data dissemination system and distribution method thereof of PSI/SI table of DTV STB.
Background technology
The Europe All Countries uses the DVB digital television standard with other part countries and regions, and (DigitalVideo Broadcast, DVB), the ATSC standard of the U.S. also is on the basis of DVB standard, to realize.The data format that the DVB data broadcasting adopts is a MPTS---and the TS code stream (transport stream, TS).According to the difference of using, DVB mainly is divided into plurality of specifications such as DVB-S, DVB-C, DVB-T, DVB-H, and its basic principle all is identical, and different mainly is that modulation system is different.It is different that different DVB systems has only front end system; Final digital information all is identical; Just all be the specification that adopts ISO13818 to describe, promptly be used for the MPEG-2 compression of digital video standard (the Current Standard document is ISO13818) on DVD and the DVB.
The DVB system mainly comprises coded system and decode system; Coded system mainly is to be used for that (Video Audio) carries out processed compressed, and (PID distributes to carry out program multiplexing through multiplexing program then with all data of signal source program; Promptly program is distributed different PID numbers respectively) formation PES bag; And then through TS stream handling procedure, all be packaged into TS code stream form to these PES bags, at last the digital signal of the TS form that obtains through ovennodulation (realization be the multiplexing of frequency); Convert analog signal to through D/A then, be modulated into high-frequency signal once more and send.And decode system receives high-frequency signal, is converted into intermediate-freuqncy signal earlier, and then converts digital signal to through the A/D of a high speed, then through a counter modulation program, has so just obtained the TS code stream.The TS code stream gets into the demultiplexing program, and this Automatic Program is analyzed the form data in the TS stream, reads all available pid informations etc.; Extract the PID (user selected program) of user's appointment then, ignore other unwanted signals, Video then to whole reception of the digital signal of this program; The Audio signal gets into different gunzips respectively; To Video, the Audio signal decompresses and shows respectively, if this program has comprised Teletext and EPG; Also might locate Teletext and EPG simultaneously, and superpose process result and Video signal together to output on the screen and show.
The TS stream of DVB system is based on the bit stream format of bag (Packet), and each bag is 188 bytes or 204 bytes.Generally be 188 bytes, the form of 204 bytes only is the CRC data that add 16 bytes at the Packet rear portion of 188 bytes, and extended formatting is the same.All Packet forms all are unified, comprise a Packet header and Packet datas.Wherein Packet header has comprised sync byte (this byte fixedly is 0x47, and it is correct that the data of representing this bag begin), the one number of this Packet (being PID) and some other information.The DVB system becomes different packets to different packing data; Distinguish different packets through bag identifier PID (Packet identification); The DVB system is with the type of unique this packet of 13bits Digital ID; For example PID=0x00 representes it is the PAT bag in the DVB system, and PID=0x10 representes it is the NIT bag of DVB system.Different program (comprising Video and Audio) adopts different PID respectively, for example, is the VIDEO data if in pmt table, detect the PID of PID=0x0120, representes that so packet number is that all bags of 0x0120 all are the Video data, and the rest may be inferred for other.
The Packet head construction takies 32bits, i.e. 4 bytes.4 bytes of the Packet head of a TS stream are header information, and 184 remaining bytes might be the Video data, also might be the Audio data, also might be DVB SI information.Utilize the data type of the pid information differentiation Packet among the header.The pat table of DVB SI information is a Program Association Table, and its PID is 0x0000.PSI (program Specific Information)/SI (Specific Information) mechanism allows DVB to transmit various information; The SI data mainly contain: the event information of the network information, transport stream, business information, business etc.; And great deal of information is all transmitted through descriptor, and a lot of signs: Network_id (network identity), Original_network_id (original network identification), Transport_stream_id (transport stream identification), Service id (service identification), eventid_id (event identifier), Bouquet_id (service group's sign) are arranged.The SI table has distributed fixing pid value, and STB is discerned the table type of SI according to the pid value of SI.Packet has carried two category informations in the TS stream: the one, and the data of materials such as sound, video, the 2nd, PSI table.Orderly arrangement with packet of given PID has just formed TS stream.The content of the carrying in the PSI table mainly is the characterising parameter of TS (this program stream).PSI by the MPEG-2 definition consists predominantly of three table: PAT, PMT, CAT.The payload of a TS packet is 188 bytes, when the byte length of PSI/SI table during greater than 184 bytes, will cut apart this table, forms section (section) and transmits.Fragmentation scheme mainly is that a tables of data is divided into a plurality of data segments.Show in the transfer process of TS bag at PSI/SI, section has played the effect of intermediary.Because a packet has only 188 bytes, and the length of section is variable, section limit for length 4096 bytes of EIT table, and the section limit for length of all the other PSI/SI tables is 1024 bytes.
Present domestic DTV is flourish, whole TV domain be in one by simulated television in the overall situation of DTV integral translation.In MPEG-II; Will be through the digital service of digital television transfer channel transfer; Comprise that the form that video, audio frequency, data etc. are packaged into TS stream propagates, wherein the various tables of the PSI/SI of DVB being divided into the segment data is elementary cell, is mapped to then in the TS stream and transmits.At present a section dissemination system is once only handled a segment data, promptly each segment data that obtains is all adjusted back to client, and this segment data of client such as resolves at processing.This method carries out that dissection process segment data speed is slow, and DTV STB is low to the disposal ability of section data, can not satisfy the data flow requirement that enlarges day by day.
Summary of the invention
The object of the invention is to provide a kind of segment data dissemination system of PSI/SI table of DTV STB, and it is low to the segment data disposal ability to have solved in the prior art DTV STB, can not satisfy the problems such as requirement of DTV.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A kind of segment data dissemination system of PSI/SI table of DTV STB; Comprise demultiplexing module; Said demultiplexing module forms corresponding segment data bag according to user's request receiving digital television TS stream; It is characterized in that said demultiplexing module linkage section processing module, buffer module successively, said demultiplexing module is handled the segment data bag section of throwing to processing module; The segment data bag formation that the section processing module is dished out in STB internal memory opening space store demultiplexed module; Table number according to the segment data bag is created buffer module; The segment data bag of identical PSI/SI Table I D, PID is stored in the buffer module; And carry out the jointing positions reason, the deletion redundant information forms final PSI/SI table with spliced segment data and passes to the user.
Preferably, said demultiplexing module is handled request setting according to user's segment data, passes through the interface module communication between user and demultiplexing module.
Preferably, said buffer module is a plurality of and the Buffer Pool of the corresponding setting of PSI/SI table, handles request according to user's different segment datas, and the said section different Buffer Pool of processing module establishment carries out the segment data splicing and handle the deletion redundant information.
Preferably, said section processing module judged the quantity of section according to the content of first segment data bag, and creates the buffer module of holding same PSI/SI table according to the quantity of section and carry out the segment data processing.
Preferably, also be provided with notification module in the said system, after said demultiplexing module was launched, notification module was monitored the result of section processing module, and when section processing module segment data was finished dealing with, the segment data after the notification module notice will be handled passed to the user.
Another object of the present invention is to provide a kind of segment data distribution method of PSI/SI table of DTV STB, it is characterized in that said method comprising the steps of:
(1) DTV STB is provided with demultiplexing module according to user's solicited message;
(2) the section processing module buffer memory demultiplexing module segment data bag of dishing out, and create buffer module according to the segment data package informatin that reads is put into same buffer module with PSI/SI Table I D, segment data bag that PID is identical, splices processing, the deletion redundant information;
(3) segment data after will handling passes to requesting users.
The demultiplexing module post-registration notification module of demultiplexing preferably, is set in the said method; Said notification module is monitored the result of section processing module, and when section processing module segment data was finished dealing with, the segment data after the notification module notice will be handled passed to the user.
With respect to scheme of the prior art, advantage of the present invention is:
The present invention is incorporated into together through all the section data with the table of DVB; The deletion redundant information; Send to the client of request then together; What client received is the complete information of this table, and the raising system obtains a kind of general dissemination system of section efficiently to the disposal ability of section data.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Fig. 1 is the system architecture diagram of the segment data dissemination system of the PSI/SI table of DTV STB of the present invention;
Fig. 2 is the segment data distribution method flow chart of the PSI/SI table of embodiment of the invention DTV STB;
Fig. 3 is that the segment data dissemination system section processing module of the PSI/SI table of embodiment of the invention TV set-top box is handled detailed schematic.
Embodiment
Below in conjunction with specific embodiment such scheme is further specified.Should be understood that these embodiment are used to the present invention is described and are not limited to limit scope of the present invention.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in the normal experiment.
Embodiment
As shown in the figure; The segment data dissemination system of the PSI/SI table of this DTV STB; Comprise demultiplexing module; Said demultiplexing module forms corresponding segment data bag according to user's request receiving digital television TS stream, it is characterized in that said demultiplexing module linkage section processing module, buffer module successively, and said demultiplexing module is handled the segment data bag section of throwing to processing module; The segment data bag formation that the section processing module is dished out in STB internal memory opening space store demultiplexed module; Table number according to the segment data bag is created buffer module; The segment data bag of identical PSI/SI Table I D, PID is stored in the buffer module; And carry out the jointing positions reason, the deletion redundant information forms final PSI/SI table with spliced segment data and passes to the user.
Demultiplexing module is handled request setting according to user's segment data, passes through the interface module communication between user and demultiplexing module.Buffer module is a plurality of and the Buffer Pool of the corresponding setting of PSI/SI table, handles request according to user's different segment datas, and said section processing module created different Buffer Pools and carried out the processing of segment data demultiplexing.The section processing module is judged the quantity of section according to the content of first segment data bag, and creates the buffer module of holding same PSI/SI table according to the quantity of section and carry out the segment data processing.
After demultiplexing module was launched, notification module was monitored the result of section processing module, and when section processing module segment data was finished dealing with, the segment data after the notification module notice will be handled passed to the user.
This programme improves Section of the prior art system, the method for all section that can a table of single treatment, and what client received is all section data of this table.Pass through native system; Can all section data of the table of DVB be incorporated into together; Delete redundant information, send to the client of request then together, what client received is the complete information of this table; The raising system is to the disposal ability of section data, and this section distribution method is general, efficient.
Native system supports that the multi-user handles simultaneously, when carrying out the section request simultaneously with a plurality of users, creates the section data that different Buffer Pools is deposited different table, passes to the user to all section data of table respectively at last.
Its implementation procedure is as shown in Figure 2:
(1) accomplishes system initialization, wait for the section request that receives the user.
(2) according to user's solicited message, mainly be Table I D, PID etc., the demultiplexing module of demultiplexing is set, registered callbacks function, the filter request of startup section data;
(3) open up a region of memory, deposit demultiplexing module and throw next section packet.Throw the section data of coming with the order buffer memory demultiplexing module of the form height according to priority of formation;
(4) from the formation of (3), receive first section data of table; Can obtain last_section_number; Confirm to create how many section data segments according to these data, create enough big Buffer Pool then, be stored in Table I D in the formation, section that PID is identical in the Buffer Pool together; And handle the deletion redundant information;
Whether the section that 5) judges a table searches for fully: if do not have, continue search; If search is fully, notify the user, call all section data passes that call back function will show then to the user.
6) after table section is delivered to the client completion, releasing memory.
When specifically carrying out the section processing, handling process is following:
A) solicited message according to the user is provided with demultiplexing module, starts the request of section data;
B) the buffer memory demultiplexing module is thrown next section data;
C) create enough big cache pool, Table I D, section that PID is identical are stored together, and handle, delete redundant information;
Whether the section that D) judges a table searches for fully: if do not have, continue search; If search fully, give the user with all section data passes of this table.
Such as other section dissemination system, this method can improve the disposal ability of DTV STB to the section data to greatest extent, guarantees that the user obtains digital television business information fast.
Above-mentioned instance only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the people who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
Claims (7)
1. the segment data dissemination system of the PSI/SI of DTV STB table; Comprise demultiplexing module; Said demultiplexing module forms corresponding segment data bag according to user's request receiving digital television TS stream; It is characterized in that said demultiplexing module linkage section processing module, buffer module successively, said demultiplexing module is handled the segment data bag section of throwing to processing module; The segment data bag formation that the section processing module is dished out in STB internal memory opening space store demultiplexed module; Table number according to the segment data bag is created buffer module; The segment data bag of identical PSI/SI Table I D, PID is stored in the buffer module; And carry out the jointing positions reason, the deletion redundant information forms final PSI/SI table with spliced segment data and passes to the user.
2. the segment data dissemination system of the PSI/SI of DTV STB according to claim 1 table is characterized in that said demultiplexing module is provided with according to user's segment data processing request, passes through the interface module communication between user and demultiplexing module.
3. the segment data dissemination system of the PSI/SI of DTV STB according to claim 1 table; It is characterized in that said buffer module is a Buffer Pool a plurality of and the corresponding setting of PSI/SI Table I D; Different segment datas according to the user are handled request; Said section processing module created different Buffer Pools and carried out segment data splicing processing, deletion redundant information.
4. the segment data dissemination system of the PSI/SI of DTV STB according to claim 1 table; It is characterized in that the quantity of said section processing module, and create the buffer module of holding same PSI/SI table according to the quantity of section and carry out the segment data processing according to the content judgement section of first segment data bag.
5. the segment data dissemination system of the PSI/SI of DTV STB according to claim 1 table; It is characterized in that also being provided with in the said system notification module; After said demultiplexing module is launched; Notification module is monitored the result of section processing module, and when section processing module segment data was finished dealing with, the segment data after the notification module notice will be handled passed to the user.
6. the segment data distribution method of the PSI/SI of DTV STB table is characterized in that said method comprising the steps of:
(1) DTV STB is provided with demultiplexing module according to user's solicited message;
(2) section segment data bag that processing module buffer memory demultiplexing module is dished out, and, the different segment data bag of identical PSI/SI table is put into same buffer module according to the segment data package informatin establishment buffer module that reads, splice processing, the deletion redundant information;
(3) spliced segment data is formed final PSI/SI table and pass to requesting users.
7. according to the method for claim 6, it is characterized in that being provided with in the said method demultiplexing module post-registration notification module of demultiplexing; Said notification module is monitored the result of section processing module, and when section processing module segment data was finished dealing with, the segment data after the notification module notice will be handled passed to the user.
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| CN102244815B (en) * | 2011-06-30 | 2013-04-24 | 南京熊猫信息产业有限公司 | Method for accelerating data reception of low-end digital set-top box chip by adopting parity channel filter |
| CN102710981B (en) * | 2012-05-08 | 2015-12-16 | 深圳市九洲电器有限公司 | A kind of method for receiving and processing data based on Set Top Box and device |
| CN102801945B (en) * | 2012-08-09 | 2014-09-24 | 珠海全志科技股份有限公司 | Digital television playback and record method and device |
| CN102957962B (en) * | 2012-12-04 | 2015-12-02 | 青岛海信宽带多媒体技术有限公司 | Monitor method and the device of PSI/SI versions of data in TS stream |
| CN102984576B (en) * | 2012-12-21 | 2016-06-01 | 四川九洲电器集团有限责任公司 | A kind of TS transmits method and the system that stream medium audio and video is peeled off |
| CN105554573B (en) * | 2015-12-11 | 2019-04-26 | 深圳创维数字技术有限公司 | A kind of data of set top box processing method and set-top box |
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| CN101742302A (en) * | 2008-11-26 | 2010-06-16 | 中国科学院微电子研究所 | Method for demodulating and multiplexing multimode mpeg system layer |
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| CN1929587A (en) * | 2005-09-09 | 2007-03-14 | 上海乐金广电电子有限公司 | Edition method for electronic program guidebooks |
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