CN101267532A - A STB dual-channel descrambling method and its applied STB - Google Patents
A STB dual-channel descrambling method and its applied STB Download PDFInfo
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- CN101267532A CN101267532A CNA2007100137894A CN200710013789A CN101267532A CN 101267532 A CN101267532 A CN 101267532A CN A2007100137894 A CNA2007100137894 A CN A2007100137894A CN 200710013789 A CN200710013789 A CN 200710013789A CN 101267532 A CN101267532 A CN 101267532A
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Abstract
The invention discloses a set-top box double channel descrambling method, comprising the following steps: a, extracting and setting entitlement control message identification codes of two decoding channels; b, generating two control words according to the two entitlement control message identification codes; and c, descrambling corresponding decoding channels in accordance with the two control words. The invention also discloses a set-top box. According to the invention, the picture-in-picture function and the two-channel program output function of current set-top box are fully made use of, thus to realize watching two-channel encrypted program at the same time.
Description
Technical field
The present invention relates to field of set-top, relate in particular to de-scrambling method and a kind of set-top box in a kind of set-top box.
Background technology
Set-top box (the English name full name is Set Top Box, be called for short STB) is meant a kind of information equipment that is used for strengthening or expand the television set function, owing to people usually it is placed on television set above, so be otherwise known as set-top box or top setting box.
Present set-top box has analog-and digital-branch, because the simulation standard of TV is about to eliminate, so the said set-top box of people generally is meant top box of digital machine now.Digital TV set-top box is the conversion equipment that digital television signal is converted to analog signal, can provide high-quality TV programme to TV user.
Top box of digital machine can support nearly all broadcasting and interactive multimedia to use, comprise watch ordinary tv programme, digital encryption TV programme, free online multimedium program and information, electronic program guides (EPG), send and receive e-mail, internet browsing, shopping online, long-distance education etc., the condition that needs is the two-way catv net.
In the process of present domestic Digital Television development, increasing set-top box has realized picture-in-picture function or two-way program output function.But because cost pressure, a set-top box has only a sheet smart card on the market now, when watching the charge program, just can only watch a cover ciphered program, and the program of another road picture or another road output just can only be watched free program so.So just, can't satisfy the demand that the user watches two cover ciphered programs.
Summary of the invention
Technical problem to be solved by this invention is, a kind of method and set-top box of set-top box dual-channel descrambling is provided.
In order to solve the problems of the technologies described above, the present invention proposes a kind of method of set-top box dual-channel descrambling, comprising:
A, extract and set the Entitlement Control Message identification code of two-way decoding channels respectively;
B, produce two control words respectively according to described two-way Entitlement Control Message identification code;
C, according to described two control word descrambling corresponding decoding passages.
Wherein, the Entitlement Control Message identification code of setting two-way decoding channels is the form that the Entitlement Control Message identification code of described two-way decoding channels is set at two sub-Entitlement Control Message identification codes of same program among the described step a.
Wherein, described step a specifically comprises:
A1, extract the Entitlement Control Message identification code of first via decoding channels, and to be set be the first sub-Entitlement Control Message identification code;
A2, extract the Entitlement Control Message identification code of the second road decoding channels, and to be set be the second sub-Entitlement Control Message identification code.
In addition, described step b specifically comprises:
B1, condition receiving system obtain smart card decoding desired data according to the described first sub-Entitlement Control Message identification code and the described second sub-authorization message identification code;
B2, smart card produce first control word and second control word of the respectively corresponding described first sub-Entitlement Control Message identification code and the described second sub-Entitlement Control Message identification code according to described data.
Wherein, the described first sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code, and the described second sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code.
Optionally, the described first sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code, and the described second sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code.
Wherein, also comprised before this method Overall Steps: condition receiving system is removed the Entitlement Control Message identification code of storing.
Correspondingly, the present invention also provides a kind of set-top box, comprises Entitlement Control Message identity assignments device, is used for setting respectively from the Entitlement Control Message identification code of two-way decoding channels extracting.
Wherein, described Entitlement Control Message identity assignments device further comprises:
First distribution module is used for the Entitlement Control Message identification code from first via decoding channels is set at the first sub-Entitlement Control Message identification code;
Second distribution module is used for the Entitlement Control Message identification code from the second road decoding channels is set at the second sub-Entitlement Control Message identification code.
Wherein, described Entitlement Control Message identity assignments device further comprises:
Constructing module is used for the constructor mapping table.
In addition, described first distribution module writes the first sub-Entitlement Control Message identification code position in the described program map table with described Entitlement Control Message identification code from first via decoding channels; Described second distribution module writes the second sub-Entitlement Control Message identification code position in the described program map table with described Entitlement Control Message identification code from the second road decoding channels.
Optionally, the described first sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code, and the described second sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code.
Optionally, the described first sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code, and the described second sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code.
Implement the present invention, can make full use of in the existing set-top box picture-in-picture function or two-way program output function and realize dual-channel descrambling, thereby can watch the two-way ciphered program simultaneously.
Description of drawings
Fig. 1 is the functional block diagram of an embodiment of a kind of set-top box of the present invention;
Fig. 2 is the functional block diagram of another embodiment of a kind of set-top box of the present invention;
Fig. 3 is based on the flow chart of an embodiment of a kind of set-top box dual-channel descrambling method of the present invention of set-top box shown in Figure 1;
Fig. 4 is based on the flow chart of another embodiment of a kind of set-top box dual-channel descrambling method of the present invention of set-top box shown in Figure 2.
Embodiment
Common scrambling algorithm CSA is a cover agreement of European DVB normal structure definition, its function is carried out scrambling to audio, video data with scrambler sequence exactly, wherein, scrambler sequence is produced by scrambling code generator by control word CW, and it stipulates that each condition receives the CA system and must adopt the common scrambling algorithm that audio-video signal is carried out scrambling.Difference between the difference CA system is to begin from the encryption to control word CW, and each CA system uses the cryptographic algorithm of oneself that CW is encrypted.
Cryptographic algorithm commonly used comprises various ways such as 3DES and RSA, and it mainly is to decrypt control word CW with the private cipher key in ECM, EMM data message and the smart card.For present top box of digital machine, because the descrambler in the set-top box is also by CSA standard symmetry descrambling, so set-top box just can be finished the descrambling to audio, video data as long as obtain control word CW.
In the past, condition reception CA system does not adopt different control word CW to carry out scrambling to the audio/video program flow point of same channel, just needs intelligent card of set-top box to decrypt the descrambling that two control word CW finish same channel audio, video data at user side like this.And in present real network, the audio program streams of same channel and video program stream all are to adopt same control word CW to carry out scrambling, and this is just for realizing that two-way descrambling function provides possibility.
Below concise and to the point set forth design principle of the present invention.The present invention has utilized condition receiving system in some set-top box can support video and audio frequency this function of descrambling of the TV programme of scrambling respectively, that is to say that video and audio frequency by the program of two-way decoding channels being regarded as same program respectively carry out descrambling, thereby just be equivalent to the two-way program is carried out descrambling, function such as the picture-in-picture by set-top box or the demonstration of two-way picture just can realize user's watching the two-way scrambled program again.
With reference to figure 1, illustrate the functional structure of an embodiment of a kind of set-top box of the present invention.As shown in the figure, set-top box 1 comprises:
Entitlement Control Message identity assignments device 13 is used for setting respectively from the Entitlement Control Message identification code (ECMPID) of two-way decoding channels extracting, and this device comprises again: first distribution module 131 and second distribution module 132;
The first sub-Entitlement Control Message identification code described here and the second sub-Entitlement Control Message identification code exist with the form of two sub-Entitlement Control Message identification codes of same program, for example in one embodiment of the invention, the described first sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code, and the second sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code; In another embodiment, the described first sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code, and the second sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code;
Condition receiving system module 14 is used to receive the Entitlement Control Message identification code from described Entitlement Control Message identity assignments device 13, and sends to smart card 15; And, obtain smart card 15 deciphering information needed by described information extraction modules 12; Described in one embodiment of the invention condition receiving system is that Yongxin is with square condition receiving system;
First control word that provides according to described condition receiving system module 14 and the second control word descrambling data from described demultiplexing module 11 are provided descrambling module 16;
In the present embodiment, at first open up a thread respectively for the extraction of the ECMPID of 12 pairs of first via decoding channels of information extraction modules and other information and the ECMPID of the second road decoding channels and the extraction of other information, so just can be so that more timely to the extraction of information in the two-way decoding channels.
With reference to figure 2, illustrate the functional structure of another embodiment of a kind of set-top box of the present invention.As shown in the figure, set-top box 2 comprises:
Entitlement Control Message identity assignments device 23 is used for setting respectively from the Entitlement Control Message identification code (ECMPID) of two-way decoding channels extracting, and this device comprises again: constructing module 230, first distribution module 231 and second distribution module 232;
Constructing module 230, be used for constructing PMT (Program Map Table, program map table) table according to Entitlement Control Message identification code and other program map information information that described information extraction modules 22 is extracted from the first via decoding channels and the second road decoding channels;
The first sub-Entitlement Control Message identification code described here and the second sub-Entitlement Control Message identification code exist with the form of two sub-Entitlement Control Message identification codes of same program, for example in one embodiment of the invention, the described first sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code, and the second sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code; In another embodiment, the described first sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code, and the second sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code;
Condition receiving system module 24 is used for the contents extraction first sub-Entitlement Control Message identification code and the second sub-Entitlement Control Message identification code according to described pmt table, and sends it to smart card 25; And, obtain smart card 25 deciphering information needed by described information extraction modules 22; Described in one embodiment of the invention condition receiving system is for calculating poker spare receiving system;
First control word that provides according to described condition receiving system module 24 and the second control word descrambling data from described demultiplexing module 21 are provided descrambling module 26;
In the present embodiment, at first open up a thread respectively for the extraction of the ECMPID of 22 pairs of first via decoding channels of information extraction modules and other information and the ECMPID of the second road decoding channels and the extraction of other information, so just can be so that more timely to the extraction of information in the two-way decoding channels.
With reference to figure 3, illustrate flow chart based on an embodiment of a kind of set-top box dual-channel descrambling method of the present invention of set-top box shown in Figure 1.In the present embodiment, watch simultaneously that with set-top box two cover ciphered programs are example, simultaneously with reference to figure 1, detailed process is:
S301, user watch the ciphered program of first via decoding channels; In practical operation, this step can be the action of user's switching channels;
S302, the ECMPID that removes last program sets; Be the ECMPID information that condition receiving system is removed last program; In one embodiment of the invention, this condition receiving system be Yongxin with square condition receiving system, the action of the removing here can be passed through function:
(TFCAS_LIST_FIRST NULL) realizes TFCASTB_SetEcmPid;
S303 extracts ECMPID; Promptly in described first via decoding channels, extract ECMPID information;
S304 is set at the first sub-Entitlement Control Message identification code with this ECMPID; In one embodiment of the invention, the described first sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code (being made as VIDECMPID), and, Yongxin with square condition receiving system in, this step can be that a parameter setting with function T FCASTB_SetEcmPid is VIDECMPID;
S305 is sent to condition receiving system with this first sub-Entitlement Control Message identification code; In one embodiment of the invention, described condition receiving system can for Yongxin with square condition receiving system, and this first sub-Entitlement Control Message identification code can be a video flowing Entitlement Control Message identification code (VIDECMPID), and this step can be by realizing with minor function: and TFCASTB_SetEcmPid (TFCAS_LIST_ADD, VIDECMPID);
S306, user watch the ciphered program of the second road decoding channels; In practical operation, can be switching to the channel of another picture of picture-in-picture function;
S307 extracts ECMPID; Promptly in the second road decoding channels, extract ECMPID information;
S308 is set at the second sub-Entitlement Control Message identification code with this ECMPID; In one embodiment of the invention, the described second sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code (being made as AUDECMPID), and, Yongxin with square condition receiving system in, this step can be the AUDECMPID that is set at the parameter of function T FCASTB_SetEcmPid;
S309 is sent to condition receiving system with this second sub-Entitlement Control Message identification code; In one embodiment of the invention, described condition receiving system can for Yongxin with square condition receiving system, and this second sub-Entitlement Control Message identification code can be an audio stream Entitlement Control Message identification code (AUDECMPID), and this step can be by realizing with minor function: and TFCASTB_SetEcmPid (TFCAS_LIST_ADD, AUDECMPID);
S310, condition receiving system confirm not had the Entitlement Control Message identification code and set; Yongxin with square condition receiving system in, by realizing with minor function: TFCASTB_SetEcmPid (TFCAS_LIST_OK, NULL);
S311, smart card obtains the deciphering information needed and produces first, second control word by condition receiving system; Promptly condition receiving system be Yongxin with square condition receiving system in, smart card goes out its deciphering desired data and obtains this data by condition receiving system according to VIDECMPID in the condition receiving system and AUDECMPID information calculations, and then goes out first corresponding with VIDECMPID and the AUDECMPID respectively control word and second control word by this data computation; Because this step is known technology, so be not described in detail;
S312, set-top box is sent to first, second road decoding channels respectively with first, second control word and uses for descrambling; Here can be that condition receiving system obtains described first, second control word and it is sent to first, second road decoding channels respectively to carry out descrambling from smart card; Can realize the Therefore, omited detailed process for those of ordinary skills easily;
S313 carries out dual-channel descrambling again through decoding output according to first, second control word; , all adopt prior art here, (Common Scrambling Algorithm CSA) carries out descrambling to promptly general scrambling algorithmic system, and decoding technique also can be existing any standard that this set-top box adopts; The output here owing to be decoding behind the dual-channel descrambling, therefore has the output of two-path video signal and two-way audio signal, i.e. the audio-video signal of program and the audio-video signal in the second road decoding channels in the first via decoding channels;
S314, process ends.
The first sub-Entitlement Control Message identification code described here and the second sub-Entitlement Control Message identification code exist with the form of two sub-Entitlement Control Message identification codes of same program, for example in the present embodiment, the first sub-Entitlement Control Message identification code and the second sub-Entitlement Control Message identification code are respectively VIDECMPID and AUDECMPID, also can be that the first sub-Entitlement Control Message identification code is AUDECMPID in fact, the second sub-Entitlement Control Message identification code is VIDECMPID, and respective function passes a parameter and also changes, and does not influence enforcement of the present invention.
With reference to figure 4, illustrate flow chart based on another embodiment of a kind of set-top box dual-channel descrambling method of the present invention of set-top box shown in Figure 2.In the present embodiment, watch simultaneously that with set-top box two cover ciphered programs are example, simultaneously with reference to figure 2, detailed process is:
S401, user watch the ciphered program of first via decoding channels; In practical operation, this step can be the action of user's switching channels;
S402 removes the ECMPID information of last program; Be ECMPID setting and the related data request that condition receiving system is removed last program; In one embodiment of the invention, this condition receiving system is for calculating poker spare receiving system, and the removing action here can be passed through function: send_stop_prog_request () and realize;
S403 extracts ECMPID; Promptly in described first via decoding channels, extract ECMPID information and other relevant program map informations;
S404, structure PMT (English full name, program map table); Promptly framework and described other program map informations according to pmt table construct a pmt table;
S405 writes described ECMPID the first sub-Entitlement Control Message identification code position of described pmt table; In one embodiment of the invention, the described first sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code sign indicating number;
S406, user watch the ciphered program of the second road decoding channels; In practical operation, can be switching to the channel of another picture of picture-in-picture function;
S407 extracts ECMPID; Promptly in the second road decoding channels, extract ECMPID information and other relevant program map informations;
S408 writes described ECMPID the second sub-Entitlement Control Message identification code position of described pmt table; In one embodiment of the invention, the described second sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code, and itself and above-mentioned video flowing Entitlement Control Message identification code are regarded as the audio stream and the video flowing Entitlement Control Message identification code of same program;
S409 is sent to condition receiving system with described pmt table; In one embodiment of the invention, described condition receiving system can pass through to realize with minor function for calculating poker spare receiving system: and send_msg to_catask (PMT_QUERY, PMTmsg, PMTmsg_len); And, after condition receiving system receives this pmt table, from this pmt table, analyze voluntarily and obtain described video flowing Entitlement Control Message identification code and audio stream Entitlement Control Message identification code;
S410, condition receiving system determine not had the Entitlement Control Message identification code and set; Promptly, condition receiving system from received pmt table, analyze obtain first, second sub-Entitlement Control Message identification code and finish after, in one embodiment of the invention, described condition receiving system is for calculating poker spare receiving system, and described first, second sub-Entitlement Control Message identification code is respectively video flowing, audio stream Entitlement Control Message identification code;
S411, smart card obtains the deciphering information needed and produces first, second control word by condition receiving system; Promptly, smart card video flowing Entitlement Control Message identification code that analysis obtains according to condition receiving system and audio stream Entitlement Control Message identification code calculate its deciphering desired data and obtain this data by condition receiving system, and then go out first corresponding with video flowing Entitlement Control Message identification code and the audio stream Entitlement Control Message identification code respectively control word and second control word by this data computation; Because this step is known technology, so be not described in detail;
S412, set-top box is sent to first, second road decoding channels respectively with first, second control word and uses for descrambling; Here can be that condition receiving system obtains described first, second control word and it is sent to first, second road decoding channels respectively to carry out descrambling from smart card; Can realize the Therefore, omited detailed process for those of ordinary skills easily;
S413 carries out dual-channel descrambling again through decoding output according to first, second control word; , all adopt prior art here, promptly general scrambling algorithmic system carries out descrambling, and decoding technique also can be existing any standard that this set-top box adopts; The output here owing to be decoding behind the dual-channel descrambling, therefore has the output of two-path video signal and two-way audio signal, i.e. the audio-video signal of program and the audio-video signal in the second road decoding channels in the first via decoding channels;
S414, process ends.
The first sub-Entitlement Control Message identification code described here and the second sub-Entitlement Control Message identification code exist with the form of two sub-Entitlement Control Message identification codes of same program, for example in the present embodiment, the first sub-Entitlement Control Message identification code and the second sub-Entitlement Control Message identification code are respectively video flowing Entitlement Control Message identification code and audio stream Entitlement Control Message identification code, also can be that the first sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code in fact, the second sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code, and respective function passes a parameter and also changes, and does not influence enforcement of the present invention.
Be to adopt the method for setting up a new pmt table in the present embodiment, equally also can adopt the method for on the basis of the pmt table that in the described first via decoding channels or the second road decoding channels, extracts, making amendment here, because principle all is the rewritings that utilized two sub-Entitlement Control Message identification codes in the pmt table, make two programs regard the Voice ﹠ Video information of a programs respectively as, process is also embodiment illustrated in fig. 4 similar in the present invention, therefore no longer describes in detail.
Implement the present invention, can make full use of in the existing set-top box picture-in-picture function or two-way program output function and realize dual-channel descrambling, thereby can watch the two-way ciphered program simultaneously.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (15)
1. the method for a set-top box dual-channel descrambling, it comprises:
A, extract and set the Entitlement Control Message identification code of two-way decoding channels respectively;
B, produce two control words respectively according to described two-way Entitlement Control Message identification code;
C, according to described two control word descrambling corresponding decoding passages.
2. the method for claim 1, it is characterized in that the Entitlement Control Message identification code of setting the two-way decoding channels among the described step a is the form that the Entitlement Control Message identification code of described two-way decoding channels is set at two sub-Entitlement Control Message identification codes of same program.
3. the method for claim 1 is characterized in that, described step a specifically comprises:
A1, extract the Entitlement Control Message identification code of first via decoding channels, and to be set be the first sub-Entitlement Control Message identification code;
A2, extract the Entitlement Control Message identification code of the second road decoding channels, and to be set be the second sub-Entitlement Control Message identification code.
4. method as claimed in claim 3 is characterized in that, described step b specifically comprises:
B1, condition receiving system obtain smart card decoding desired data according to the described first sub-Entitlement Control Message identification code and the described second sub-authorization message identification code;
B2, smart card produce first control word and second control word of the respectively corresponding described first sub-Entitlement Control Message identification code and the described second sub-Entitlement Control Message identification code according to described data.
5. as claim 3 or 4 described methods, it is characterized in that the described first sub-Entitlement Control Message identification code is set at video flowing Entitlement Control Message identification code, the described second sub-Entitlement Control Message identification code is set at audio stream Entitlement Control Message identification code.
6. as claim 3 or 4 described methods, it is characterized in that the described first sub-Entitlement Control Message identification code is set at audio stream Entitlement Control Message identification code, the described second sub-Entitlement Control Message identification code is set at video flowing Entitlement Control Message identification code.
7. as each described method in the claim 1,2,3,4, it is characterized in that, also comprised before this method Overall Steps: condition receiving system is removed the Entitlement Control Message identification code of storing.
8. method as claimed in claim 5 is characterized in that, also comprises before this method Overall Steps: condition receiving system is removed the Entitlement Control Message identification code of storing.
9. method as claimed in claim 6 is characterized in that, also comprises before this method Overall Steps: condition receiving system is removed the Entitlement Control Message identification code of storing.
10. a set-top box is characterized in that, comprises Entitlement Control Message identity assignments device, is used for setting respectively from the Entitlement Control Message identification code of two-way decoding channels extracting.
11. set-top box as claimed in claim 10 is characterized in that, described Entitlement Control Message identity assignments device further comprises:
First distribution module is used for the Entitlement Control Message identification code from first via decoding channels is set at the first sub-Entitlement Control Message identification code;
Second distribution module is used for the Entitlement Control Message identification code from the second road decoding channels is set at the second sub-Entitlement Control Message identification code.
12. set-top box as claimed in claim 11 is characterized in that, described Entitlement Control Message identity assignments device further comprises:
Constructing module is used for the constructor mapping table.
13. set-top box as claimed in claim 12 is characterized in that, described first distribution module writes the first sub-Entitlement Control Message identification code position in the described program map table with described Entitlement Control Message identification code from first via decoding channels; Described second distribution module writes the second sub-Entitlement Control Message identification code position in the described program map table with described Entitlement Control Message identification code from the second road decoding channels.
14. as each described set-top box in the claim 11,12,13, it is characterized in that, the described first sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code, and the described second sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code.
15. as each described set-top box in the claim 11,12,13, it is characterized in that, the described first sub-Entitlement Control Message identification code is an audio stream Entitlement Control Message identification code, and the described second sub-Entitlement Control Message identification code is a video flowing Entitlement Control Message identification code.
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