CN101616127A - A kind of data de-scrambling method, device and receiving terminal - Google Patents
A kind of data de-scrambling method, device and receiving terminal Download PDFInfo
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- CN101616127A CN101616127A CN200810068018A CN200810068018A CN101616127A CN 101616127 A CN101616127 A CN 101616127A CN 200810068018 A CN200810068018 A CN 200810068018A CN 200810068018 A CN200810068018 A CN 200810068018A CN 101616127 A CN101616127 A CN 101616127A
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- pmt table
- descrambling
- pmt
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Abstract
The present invention is applicable to the receiving terminal technical field, and a kind of data de-scrambling method is provided, device and receiving terminal, and described method comprises: receive the descrambling instruction of current frequency; The pmt table of the corresponding a plurality of services of described descrambling instruction is obtained in instruction according to descrambling; The pmt table of a plurality of services of obtaining is combined in the pmt table; Pmt table after the combination is sent to CA carries out descrambling.The embodiment of the invention is by receiving the descrambling instruction of current frequency, the pmt table of the corresponding a plurality of services of this descrambling instruction is obtained in instruction according to descrambling, the pmt table of a plurality of services of obtaining is combined in the pmt table, and the pmt table after will making up is sent to CA and carries out descrambling, makes the CA a plurality of services of descrambling simultaneously.
Description
Technical field
The invention belongs to the receiving terminal technical field, relate in particular to a kind of data de-scrambling method, device and receiving terminal.
Background technology
Receiving terminal is when carrying out descrambling to scrambled data streams, award card (Certificate Authority with certificate, CA) two data flow that have that descrambling is relevant are Entitlement Control Message (Entitlement Control Message, ECM) and Entitlement Management Message (Entitlement Manger Message, EMM).
In transmission course, (Service Key, SK) (ControlWord CW) transmits in ECM the control word after the encryption, comprises program information such as program source, time, classifying content and program price among the ECM by business cipher key.The SK that CW is encrypted transmits in EMM, and SK will comprise information such as intelligent card numbers, station address, mandate time, authorization mechanism through the encryption of individual subscriber distributing key among the EMM before transmission.Wherein, the process identification (PID) of Entitlement Control Message ECM (Process Identification, PID) (Program Map Table has description in PMT) in program map table, (Condition Access Table has description in CAT) to the PID of Entitlement Management Message EMM at CAT Conditional Access Table.
Receiving terminal obtains the PID of ECM and EMM according to the description in PMT and the CAT table, obtain ECM and EMM according to PID then, transferring to IC-card handles, STB utilizes the key that leaves in the IC-card at first EMM to be deciphered, obtain corresponding encryption key, with it ECM is deciphered, obtain CW, CW is write descrambler just can restore transparent program stream.
Aforesaid way is to the Digital Television scrambled program, because of the same time only has a channel in broadcast, so only need a service of descrambling (Srvice), it is single Service descrambling, corresponding pmt table of this Service in the code stream and the intact CA of passing to of CAT table are gone to handle, can realize descrambling current scrambled program.And use very many third party software data broadcastings at digital TV field, showing one when comprising the webpage of sound, video, picture and text message, these information can be included among a plurality of Service, if still foregoing same procedure is removed descrambling, will cause normally descrambling of other Service.
To sum up, in the prior art, the corresponding pmt table of Service program, use the pmt table that only can from code stream, obtain current scrambled program correspondence, pass to the descrambling interface that the CA module provides together with the CAT table, get final product the current program of descrambling, but this just supports single Service descrambling, when descrambling comprises the information of a plurality of services, may cause normally descrambling of other service.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of data de-scrambling method, is intended to solve the interface that CA provides in the prior art and can only supports single descrambling service, can not support the problem of a plurality of services of descrambling.
The embodiment of the invention is achieved in that a kind of data de-scrambling method, said method comprising the steps of:
Receive the descrambling instruction of current frequency;
Obtain the pmt table of the corresponding a plurality of services of described descrambling instruction according to described descrambling instruction;
The pmt table of a plurality of services of obtaining is combined in the pmt table;
Pmt table after the combination is sent to CA carries out descrambling.
Another purpose of the embodiment of the invention is to provide a kind of data de-scrambling device, and described device comprises:
Descrambling command reception module is used to receive the descrambling instruction of current frequency;
The pmt table acquisition module is used for according to described descrambling instruction and obtains the pmt table of the corresponding a plurality of services of described descrambling instruction;
The pmt table composite module, the pmt table that is used for a plurality of services of will obtain is combined to a pmt table;
The pmt table sending module is used for that the pmt table after the combination is sent to CA and carries out descrambling.
Another purpose of the embodiment of the invention is to provide a kind of receiving terminal, comprises memory cell, and described receiving terminal also comprises a data de-scrambling device, and described data de-scrambling device comprises:
Descrambling command reception module is used to receive the descrambling instruction of current frequency;
The pmt table acquisition module is used for according to described descrambling instruction and obtains the pmt table of the corresponding a plurality of services of described descrambling instruction;
The pmt table composite module, the pmt table that is used for a plurality of services of will obtain is combined to a pmt table;
The pmt table sending module is used for that the pmt table after the combination is sent to CA and carries out descrambling.
The embodiment of the invention is by receiving the descrambling instruction of current frequency, the pmt table of the corresponding a plurality of services of this descrambling instruction is obtained in instruction according to descrambling, the pmt table that obtains is combined in the pmt table, and the pmt table after will making up is sent to CA and carries out descrambling, makes the CA a plurality of services of descrambling simultaneously.
Description of drawings
Fig. 1 is the flow chart of the data de-scrambling method that provides of the embodiment of the invention;
Fig. 2 is the structure chart of the data de-scrambling device that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention is by receiving the descrambling instruction of current frequency, and the pmt table of this descrambling instruction corresponding with service is obtained in instruction according to descrambling, the pmt table that obtains is combined in the pmt table, and the pmt table after will making up is sent to CA and carries out descrambling.
Fig. 1 shows the flow process of the data de-scrambling method that the embodiment of the invention provides, and details are as follows.
In step S101, receive the descrambling instruction of current frequency.
In step S102, the pmt table of this descrambling instruction corresponding with service is obtained in instruction according to descrambling;
In specific implementation process, at first ask pmt table and CAT in the descrambling instruction corresponding with service, pmt table that request is obtained and CAT storage afterwards.
In step S103, will obtain the pmt table of a plurality of services according to the mode of obtaining pmt table and store successively, perhaps store simultaneously.
Wherein, when obtaining pmt table, may be according to descrambling instruction obtaining one by one, to obtain the pmt table of a plurality of services and store successively this moment, also may be that the pmt table of a plurality of services is obtained in instruction simultaneously according to descrambling, at this moment, the pmt table that obtains a plurality of services be stored simultaneously.
In step S104, the pmt table that obtains is combined in the pmt table.
In step S105, the pmt table after the combination is sent to CA carries out descrambling, wherein, when sending, be the pmt table after this combination to be sent to CA together with the CAT table of storing carry out descrambling.
Certainly, in specific implementation process, whether the pmt table that receiving terminal will detect after the combination needs to upgrade, when detecting pmt table and need upgrade, then again according to descrambling packing of orders pmt table.
The embodiment of the invention is combined into a new PMT by the PMT with one or more service, again in conjunction with original CAT, gives CA descrambling, makes that CA can a plurality of services of while descrambling.
The present invention will be described with concrete example below.
In data broadcasting, open a webpage that comprises audio frequency and video, picture and text, this three item numbers certificate all belongs to different Service, and all scramblings.
The first step, the instruction of receiving the descrambling audio frequency and video earlier, from using the Service that obtains this audio frequency and video correspondence, the PMT information of this Service correspondence is as follows:
|--table_id＝0x2
|--section_syntax_indicator
|--section_length
|--program_number
|--version_number
|--current_next_indicator
|--section_number
|--last_section_number
|--PCR_PID
|--program_info_length
|--+video unit stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the video descrambling)
|--+audio unit stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the audio frequency descrambling)
This PMT information is passed to the CA module can the descrambling audio, video data.
Second step: receive the notice of descrambling picture again, from using the Service that obtains this picture correspondence, the PMT information of this Service correspondence is as follows:
|--table_id＝0x2
|--section_syntax_indicator
|--section_length
|--program_number
|--version_number
|--current_next_indicator
|--section_number
|--last_section_number
|--PCR_PID
|--program_info_length
|--+picture element unit cell stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the picture descrambling)
The pmt table that this pmt table and front is imported into the CA module is combined, and the pmt table after the combination is as follows:
|--table_id＝0x2
|--section_syntax_indicator
|--section_length
|--program_number
|--version_number
|--current_next_indicator
|--section_number
|--last_section_number
|--PCR_PID
|--program_info_length
|--+video unit stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the video descrambling)
|--+audio unit stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the audio frequency descrambling)
|--+picture element unit cell stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the picture descrambling)
Pmt table after the combination is passed to the CA module, can be on the basis of descrambling audio frequency and video, the descrambling picture.
Wherein, pass to the pmt table that the pmt table of CA module can import last time into and cover, promptly the CA module only can be carried out descrambling to the current pmt table related data of importing into.
The 3rd step: receive the notice of descrambling text at last, from using the Service that obtains the text correspondence, the PMT information of this Service correspondence is as follows:
|--table_id＝0x2
|--section_syntax_indicator
|--section_length
|--program_number
|--version_number
|--current_next_indicator
|--section_number
|--last_section_number
|--PCR_PID
|--program_info_length
|--+text unit stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the text descrambling)
The pmt table pack that this pmt table and front are passed the CA module together, the pmt table after the combination is as follows:
|--table_id＝0x2
|--section_syntax_indicator
|--section_length
|--program_number
|--version_number
|--current_next_indicator
|--section_number
|--last_section_number
|--PCR_PID
|--program_info_length
|--+video unit stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the video descrambling)
|--+audio unit stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the audio frequency descrambling)
|--+picture element unit cell stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the picture descrambling)
|--+text unit stream (ES PID, stream_type, ES-info_length)
||--+CA_descriptor (the ECM_pid information that comprises the text descrambling)
Pmt table after the combination is passed to the CA module, can be on the basis of descrambling audio frequency and video and picture, the descrambling text, by this, we just can be on a webpage, can watch audio frequency and video, picture and text behind the descrambling.
The embodiment of the invention also provides a kind of receiving terminal, and this receiving terminal comprises memory cell, and this receiving terminal also comprises a data de-scrambling device, sees also Fig. 2.
Descrambling command reception module 21 receives the descrambling instruction of current frequency;
Pmt table acquisition module 22 obtains the pmt table of this descrambling instruction corresponding with service according to descrambling instruction.In specific implementation process, pmt table acquisition module 22 also comprises pmt table and CAT request module 221.
Wherein, the pmt table and the CAT of pmt table and CAT request module 221 request descrambling instruction corresponding with service.
The pmt table that pmt table memory module 23 will be obtained a plurality of services according to the mode of obtaining pmt table is stored successively, perhaps stores simultaneously.
Pmt table composite module 24 is combined to the pmt table that obtains in the pmt table;
Pmt table after pmt table sending module 25 will make up is sent to CA and carries out descrambling.Pmt table sending module 24 is sent to CA with this pmt table together with the CAT table of storing and carries out descrambling.
Whether the pmt table that pmt table detection module 26 detects after the combination needs to upgrade; When detecting pmt table and need upgrade, then control pmt table acquisition module 22 and obtain pmt table again.
The embodiment of the invention is by receiving the descrambling instruction of current frequency, the pmt table of the corresponding a plurality of services of this descrambling instruction is obtained in instruction according to descrambling, the pmt table of a plurality of services of obtaining is combined in the pmt table, and the pmt table after will making up is sent to CA and carries out descrambling, makes the CA a plurality of services of descrambling simultaneously.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, a kind of data de-scrambling method is characterized in that, said method comprising the steps of:
Receive the descrambling instruction of current frequency;
Obtain the program map table PMT of a plurality of services corresponding with described descrambling instruction according to described descrambling instruction;
The pmt table of a plurality of services of obtaining is combined in the pmt table;
With the combination after pmt table be sent to certificate award the card CA carry out descrambling.
2, data de-scrambling method as claimed in claim 1 is characterized in that, after the pmt table that will obtain was combined to a pmt table, described method also comprised:
Whether the pmt table that detects after making up needs to upgrade; When detecting pmt table and need upgrade, then again according to descrambling packing of orders pmt table.
3, data de-scrambling method as claimed in claim 1 is characterized in that, the described step of obtaining the pmt table of descrambling instruction corresponding with service specifically comprises:
Pmt table and CAT Conditional Access Table CAT in the request descrambling instruction corresponding with service;
Pmt table and CAT table that request obtains are stored.
4, data de-scrambling method as claimed in claim 1 is characterized in that, the pmt table after the combination is sent to the step that CA carries out descrambling specifically comprises:
Pmt table after the combination is sent to CA together with the CAT table of storing carries out descrambling.
5, a kind of data de-scrambling device is characterized in that, described device comprises:
Descrambling command reception module is used to receive the descrambling instruction of current frequency;
The pmt table acquisition module is used for according to described descrambling instruction and obtains the pmt table of a plurality of services corresponding with described descrambling instruction;
The pmt table composite module, the pmt table that is used for a plurality of services of will obtain is combined to a pmt table;
The pmt table sending module is used for that the pmt table after the combination is sent to CA and carries out descrambling.
6, data de-scrambling device as claimed in claim 5 is characterized in that, described device also comprises:
The pmt table detection module, whether the pmt table that is used to detect after the combination needs to upgrade, and when detecting pmt table and need upgrade, then controls described pmt table acquisition module and obtains pmt table again.
7, data de-scrambling device as claimed in claim 5 is characterized in that, described pmt table acquisition module specifically comprises:
Pmt table and CAT request module are used for asking the pmt table and the CAT of descrambling instruction corresponding with service to show.
8, data de-scrambling device as claimed in claim 5 is characterized in that, the pmt table after described pmt table sending module will make up is sent to CA together with the CAT table of storing and carries out descrambling.
9, a kind of receiving terminal comprises memory cell, it is characterized in that, described receiving terminal also comprises a data de-scrambling device, and described data de-scrambling device comprises:
Descrambling command reception module is used to receive the descrambling instruction of current frequency;
The pmt table acquisition module is used for according to described descrambling instruction and obtains the pmt table of a plurality of services corresponding with described descrambling instruction;
The pmt table composite module, the pmt table that is used for a plurality of services of will obtain is combined to a pmt table;
The pmt table sending module is used for that the pmt table after the combination is sent to CA and carries out descrambling.
10, receiving terminal as claimed in claim 9 is characterized in that, described data de-scrambling device also comprises:
The pmt table detection module, whether the pmt table that is used to detect after the combination needs to upgrade; When detecting pmt table and need upgrade, then control described pmt table acquisition module and obtain pmt table again.
11, receiving terminal as claimed in claim 9 is characterized in that, described pmt table acquisition module specifically comprises:
Pmt table and CAT request module are used for asking the pmt table and the CAT of descrambling instruction corresponding with service to show.
12, receiving terminal as claimed in claim 9 is characterized in that, the pmt table after described pmt table sending module will make up is sent to CA together with the CAT table of storing and carries out descrambling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810068018A CN101616127A (en) | 2008-06-24 | 2008-06-24 | A kind of data de-scrambling method, device and receiving terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810068018A CN101616127A (en) | 2008-06-24 | 2008-06-24 | A kind of data de-scrambling method, device and receiving terminal |
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| Publication Number | Publication Date |
|---|---|
| CN101616127A true CN101616127A (en) | 2009-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810068018A Pending CN101616127A (en) | 2008-06-24 | 2008-06-24 | A kind of data de-scrambling method, device and receiving terminal |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102149013A (en) * | 2011-03-29 | 2011-08-10 | 深圳创维数字技术股份有限公司 | Data processing system and method for digital television as well as digital television receiving terminal |
| CN102158752A (en) * | 2011-01-26 | 2011-08-17 | 深圳创维数字技术股份有限公司 | Digital television terminal, and data descrambling method and device thereof |
| CN105100889A (en) * | 2015-08-12 | 2015-11-25 | 深圳创维数字技术有限公司 | Descrambling key set updating method and set-top box |
| CN106210816A (en) * | 2016-07-18 | 2016-12-07 | 青岛海信电器股份有限公司 | A kind of transport stream TS de-scrambling method and device |
| CN107040803A (en) * | 2017-03-31 | 2017-08-11 | 青岛海信电器股份有限公司 | Digital television system and the de-scrambling method for supporting multichannel different frequent points program simultaneously |
| CN107566886A (en) * | 2017-09-21 | 2018-01-09 | 成都德芯数字科技股份有限公司 | Program de-scrambling method and device |
-
2008
- 2008-06-24 CN CN200810068018A patent/CN101616127A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158752A (en) * | 2011-01-26 | 2011-08-17 | 深圳创维数字技术股份有限公司 | Digital television terminal, and data descrambling method and device thereof |
| CN102149013A (en) * | 2011-03-29 | 2011-08-10 | 深圳创维数字技术股份有限公司 | Data processing system and method for digital television as well as digital television receiving terminal |
| CN102149013B (en) * | 2011-03-29 | 2013-06-26 | 深圳创维数字技术股份有限公司 | Data processing system and method for digital television as well as digital television receiving terminal |
| CN105100889A (en) * | 2015-08-12 | 2015-11-25 | 深圳创维数字技术有限公司 | Descrambling key set updating method and set-top box |
| CN105100889B (en) * | 2015-08-12 | 2018-09-04 | 深圳创维数字技术有限公司 | A kind of descramble key set updating method and set-top box |
| CN106210816A (en) * | 2016-07-18 | 2016-12-07 | 青岛海信电器股份有限公司 | A kind of transport stream TS de-scrambling method and device |
| CN107040803A (en) * | 2017-03-31 | 2017-08-11 | 青岛海信电器股份有限公司 | Digital television system and the de-scrambling method for supporting multichannel different frequent points program simultaneously |
| CN107566886A (en) * | 2017-09-21 | 2018-01-09 | 成都德芯数字科技股份有限公司 | Program de-scrambling method and device |
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