CN106210816A - A kind of transport stream TS de-scrambling method and device - Google Patents
A kind of transport stream TS de-scrambling method and device Download PDFInfo
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- CN106210816A CN106210816A CN201610566223.3A CN201610566223A CN106210816A CN 106210816 A CN106210816 A CN 106210816A CN 201610566223 A CN201610566223 A CN 201610566223A CN 106210816 A CN106210816 A CN 106210816A
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- 238000000034 method Methods 0.000 title claims abstract description 68
- 238000001914 filtration Methods 0.000 claims description 12
- 230000001143 conditioned effect Effects 0.000 claims description 11
- 238000010304 firing Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 9
- 238000004590 computer program Methods 0.000 description 6
- 238000013507 mapping Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
- H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The embodiment of the present application provides a kind of transport stream TS de-scrambling method, including: common interface CI card receives the transport stream TS that television chip sends；Obtain CAT Conditional Access Table CAT；Obtain Program Map Table PMT；According to described CAT Conditional Access Table CAT, from described Program Map Table PMT, parse Control Word；Described Control Word and described transport stream TS are sent to described television chip；Described television chip, in the described transport stream TS received, filters out described audio pack corresponding for Program Map Table PMT and video bag；According to described Control Word, descramble described audio pack and video bag.In the embodiment of the present application, make use of relative performance higher television chip that TS stream is descrambled, improve the descrambling speed of TS stream.
Description
Technical field
The application relates to video technique field, particularly relates to a kind of transport stream TS de-scrambling method and a kind of transport stream TS solution
Disturb device.
Background technology
In the equipment of Broadcast and TV system is applied, in order to adapt to condition reception CA (Condition Access) body all over China
Being different situations, apparatus of digital television receiving proposes separation between machine and card based on common interface CI (Common Interface)
Scheme.
In CI separation between machine and card scheme, CI kilocalorie descrambles for transport stream TS (Transport Stream).Reference
Fig. 1 is the schematic diagram of existing transport stream TS descrambling procedure.Wherein, television chip 10 receives radio frequency (Radio
Frequency) streaming, by tuner 101Tuner and demodulator 102Demod corresponding locking frequency point, then demodulates
The TS stream of scrambling.TS stream and Program Map Table PMT (Program Map Table) are sent to CI card by television chip 10
The demultiplexer 201 of 20, CI cards demultiplexing from TS flows obtains CAT Conditional Access Table CAT (Conditional Access
Table), the condition reception CA module 202 of CI card 20, according to condition reception CAT, parses control word from Program Map Table PMT
CW(Control Word).CI card arranges descrambler 203 according to Control Word, descrambler 203 descramble in TS stream and reflect with program
Audio pack that firing table PMT is corresponding and video bag.TS stream after descrambling is sent back television chip 10, by television core by CI card 20
The demultiplexer 103 of sheet, filters the audio pack in the TS stream after descrambling and video bag, and television chip is by audio pack and video bag
Output plays out to corresponding decoder 104.
The producer of currently used CI card, the optimization to descrambling speed, all dependence CI card producer, the processing speed of CI card is certainly
Determine descrambling speed.The configuration of CI card hardware (cpu, internal memory etc.) listened due to CI card producer, software optimization is not enough, causes CI big
The descrambling speed of card is very slow, the time of descrambling transport stream TS is long.
Summary of the invention
In view of the above problems, it is proposed that the embodiment of the present application is to provide one to overcome the problems referred to above or at least in part
Solve a kind of transport stream TS de-scrambling method of the problems referred to above and corresponding a kind of transport stream TS descrambler.
In order to solve the problems referred to above, the embodiment of the present application discloses a kind of transport stream TS de-scrambling method, including:
Common interface CI card receives the transport stream TS that television chip sends；
Obtain CAT Conditional Access Table CAT；
Obtain Program Map Table PMT；
According to described CAT Conditional Access Table CAT, from described Program Map Table PMT, parse Control Word；
Described Control Word and described transport stream TS are sent to described television chip；Described television chip is used for
In the described transport stream TS received, filter out described audio pack corresponding for Program Map Table PMT and video bag；According to described
Control Word, descrambles described audio pack and video bag.
Preferably, the step of described acquisition CAT Conditional Access Table CAT includes:
Described common interface CI card receives the CAT Conditional Access Table CAT that described television chip sends, described CAT Conditional Access Table
CAT is obtained from the parsing of described transport stream TS by described television chip.
Preferably, the step of described acquisition CAT Conditional Access Table CAT includes:
Described common interface CI card parses described CAT Conditional Access Table CAT from described transport stream TS.
Preferably, the step of described acquisition Program Map Table PMT includes:
Described common interface CI card receives the Program Map Table PMT that described television chip sends, described Program Map Table
PMT is obtained from the parsing of described transport stream TS by described television chip.
Preferably, the step of described acquisition Program Map Table PMT includes:
Described common interface CI card parses described Program Map Table PMT from described transport stream TS.
Meanwhile, the embodiment of the present application also discloses a kind of transport stream TS de-scrambling method, including:
Television chip sends transport stream TS to common interface CI card；Described common interface CI card is used for using pre-conditioned
Reception table CAT parses Control Word from default Program Map Table PMT, described Control Word and described transport stream TS is sent out
Deliver to described television chip；
Receive Control Word and transport stream TS that described common interface CI card sends；
In the described transport stream TS received, filter out described audio pack corresponding for Program Map Table PMT and video bag；
According to described Control Word, descramble described audio pack and video bag.
Preferably, also include:
Described television chip sends described pre-conditioned reception table CAT to described common interface CI card.
Preferably, described common interface CI card, for from described transport stream TS, parses described CAT Conditional Access Table CAT.
Meanwhile, the embodiment of the present application also discloses a kind of transport stream TS descrambler, including:
It is positioned at the receiver module of described common interface CI card, for receiving the transport stream TS that television chip sends；
It is positioned at the CAT Conditional Access Table acquisition module of described common interface CI card, is used for obtaining CAT Conditional Access Table CAT；
It is positioned at the Program Map Table acquisition module of described common interface CI card, is used for obtaining Program Map Table PMT；
It is positioned at the parsing module of described common interface CI card, for according to described CAT Conditional Access Table CAT, reflects from described program
Firing table PMT parses Control Word；
It is positioned at the sending module of described common interface CI card, for described Control Word and described transport stream TS being sent
To described television chip；Described television chip, in the described transport stream TS received, filters out described program and reflects
Audio pack that firing table PMT is corresponding and video bag；According to described Control Word, descramble described audio pack and video bag.
Meanwhile, the embodiment of the present application also discloses a kind of transport stream TS descrambler, including:
It is positioned at the transport module of television chip, for sending transport stream TS to common interface CI card；Described common interface
CI card is used for using pre-conditioned reception table CAT to parse Control Word from default Program Map Table PMT, by described control word
CW and described transport stream TS are sent to described television chip；
Be positioned at the receiver module of described television chip, for receive described common interface CI card transmission Control Word with
And transport stream TS；
It is positioned at the filtering module of described television chip, for, in the described transport stream TS received, filtering out described joint
Audio pack that mesh mapping table PMT is corresponding and video bag；
It is positioned at the descrambling module of described television chip, for according to described Control Word, descrambles described audio pack and regard
Frequency bag.
The embodiment of the present application includes advantages below:
In the embodiment of the present application, CI card receives transport stream TS and the Program Map Table PMT that television chip sends, and depends on
From Program Map Table PMT, Control Word is parsed according to CAT Conditional Access Table CAT；Control Word and TS stream are sent to TV by CI card
End chip, by the descrambler of television chip according to Control Word, completes the descrambling to TS stream.With employing CI in existing method
The mode that card carries out descrambling is compared, and in the embodiment of the present application, make use of relative performance higher television chip to carry out TS stream
Descrambling, improves the descrambling speed of TS stream.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing transport stream TS descrambling procedure；
Fig. 2 is the flow chart of steps of a kind of transport stream TS de-scrambling method embodiment of the application；
Fig. 3 is the flow chart of steps of a kind of transport stream TS de-scrambling method embodiment of the application；
Fig. 4 is the schematic diagram of a kind of transport stream TS of the application descrambling；
Fig. 5 is the structured flowchart of a kind of transport stream TS descrambler embodiment of the application；
Fig. 6 is the structured flowchart of a kind of transport stream TS descrambler embodiment of the application.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the application, feature and advantage to become apparent from, real with concrete below in conjunction with the accompanying drawings
The application is described in further detail by mode of executing.
One of core idea of the embodiment of the present application is, in the embodiment of the present application, CI card receives television chip and sends
Transport stream TS, CI card parses Program Map Table PMT from TS flows, and according to CAT Conditional Access Table CAT from Program Map Table PMT
In parse Control Word；Control Word and TS stream are sent to television chip by CI card, by the descrambler of television chip
According to Control Word, complete the descrambling to TS stream.
With reference to Fig. 2, it is shown that the flow chart of steps of a kind of transport stream TS de-scrambling method embodiment of the application, the most permissible
Comprise the steps:
Step 301, common interface CI card receives the transport stream TS that television chip sends；
Transport stream TS (Transport Stream), also known as MPEG2-TS, is the communication protocols for audio, image and data
Fixed.TS stream is bit stream format based on packet Packet, and each bag is 188 bytes.
TS stream is made up of one or multi-channel program, and per pass program is compounded in by one or more primary flows and some other streams
Together, including video flowing, audio stream, Program Specific Information stream PSI (Program Specific Information) and other
Packet.Wherein PSI table has 4 types: Program Association Table PAT (Program Association Table), Program Map Table
(PMT), network information table NIT (Network Information Table) and CAT Conditional Access Table CAT.
The packet of TS stream is represented by bag mark PID (Pid Packet Identifier).PID is unique in TS stream
Recognition marks, Packet Data content type is represented by PID.
The PID (00) that pat table dynamic image expert group MPEG (Moving Picture Experts Group) specifies
Indicate, generally represent with PID=0.Its Main Function is that stream is transmitted on each road for multiplexing, it is provided which comprises in transmission stream
The position of the Program Map Table (PMT) of a little programs, the numbering of program and corresponding program, i.e. bag mark (PID) of the TS bag of PMT
Value, also provide for simultaneously the position of network information table (NIT), i.e. NIT TS bag bag mark (PID) value.
The PID (01) that CAT table MPEG specifies indicates, generally represents with PID=1.It provide at multiplex stream conditional
Reception system is for information about, it is intended that condition reception CA module Entitlement Management Message corresponding with them EMM (Entitlement
Management Message) between contact, it is intended that the PID of EMM, and relevant parameter.
Pmt table indicates that the content that this program comprises, i.e. this program which stream are made up of, and types of these streams (audio frequency, regard
Frequently, data), and form the position of the stream of this program, the pid value of i.e. corresponding TS bag.
CPU, decoder, demultiplexer, graphic process unit are all integrated in by currently the majority manufacturer with video-audio processor
In television chip.In television chip, the bag mark PID transmission stream to receiving first transmitted according to transport stream TS
Demultiplex.
The meaning of demultiplexing is, owing to TS stream is the code stream of a kind of multiplexing, the inside has mixed polytype bag；Demultiplex
Packet identical for type can be stored in same buffered with TS stream, process respectively.Thus can by audio frequency, video or its
He comes at the data separation of business information.
Step 302, obtains CAT Conditional Access Table CAT；
CI card obtains CAT Conditional Access Table CAT.
In a kind of preferred exemplary in the embodiment of the present application, shown step 302 specifically can include following sub-step:
Sub-step S11, described common interface CI card parses described CAT Conditional Access Table CAT from described transport stream TS.
By CI card from the TS stream received, parse CAT Conditional Access Table CAT.
Concrete, described common interface CI card includes demultiplexer；
Described sub-step S11 is specifically as follows:
Described demultiplexer, parses described CAT Conditional Access Table CAT from described transport stream TS.
By the demultiplexer in CI card, resolve the PID of each packet, then according to PID each data demultiplexed
Bag, obtains CAT Conditional Access Table CAT.
In another kind of preferred exemplary in the embodiment of the present application, shown step 302 specifically can include following sub-step:
Sub-step S21, described common interface CI card receives the CAT Conditional Access Table CAT that described television chip sends, described
CAT Conditional Access Table CAT is obtained from the parsing of described transport stream TS by described television chip.
In this example, CAT Conditional Access Table CAT can be obtained by television chip solution multiplexing.The demultiplexing of television chip
Device, resolves TS stream packets and obtains bag mark PID, acquire CAT Conditional Access Table CAT according to bag mark PID.Television chip
The CAT Conditional Access Table CAT parsed is sent to CI card.In this example, separated out by the television chip solution of better performances
CAT Conditional Access Table CAT, and receive table CAT without CI card analysis condition from TS flows.Television chip resolves CAT Conditional Access Table CAT
Speed faster, thus save the parsing time of CAT Conditional Access Table CAT.
Step 303, obtains Program Map Table PMT；
Television chip obtains Program Map Table PMT, then Program Map Table PMT is sent to CI card.
In a kind of preferred exemplary in the embodiment of the present application, shown step 303 specifically can include following sub-step:
Sub-step S31, described common interface CI card parses described Program Map Table PMT from described transport stream TS.
Television chip parses Program Map Table PMT, then by Program Map Table according to bag mark PID from TS flows
PMT is sent to CI card.
Concrete, described common interface CI card includes demultiplexer；Described sub-step S21 can be: described demultiplexer,
Described Program Map Table PMT is parsed from described transport stream TS.In another kind of preferred exemplary in the embodiment of the present application, institute
Show that step 303 specifically can include following sub-step:
Sub-step S41, described common interface CI card receives the Program Map Table PMT that described television chip sends, described
Program Map Table PMT is obtained from the parsing of described transport stream TS by described television chip.
In this example, Program Map Table PMT can be obtained by television chip solution multiplexing.The demultiplexing of television chip
Device, resolves TS stream packets and obtains bag mark PID, acquire Program Map Table PMT according to bag mark PID.Television chip
The Program Map Table PMT parsed is sent to CI card.In this example, separated out by the television chip solution of better performances
Program Map Table PMT, and from TS flows, resolve Program Map Table PMT without CI card.Television chip resolves Program Map Table PMT
Speed faster, thus save the parsing time of Program Map Table PMT.
Step 304, according to described CAT Conditional Access Table CAT, parses Control Word from described Program Map Table PMT；
CAT Conditional Access Table CAT provides and receives CA module and Entitlement Management Message thereof, for program one or many condition
Descrambling work.If in a TS stream, any primary flow has carried out encryption, then must insert bar in TS flows
Part receives table CAT.
In CAT, most important field is exactly CA_descriptor () section.To simply tell about this description section below.
CA_descriptor is used for representing containing Entitlement Control Message ECM (Entitlement Control Message)
Or the PID of the TS of EMM information, i.e. CA_PID.
When CA_descriptor occurs in PMT, CA_PID points to containing relevant to Entitlement Control Message (ECM)
Program bag.
When CA_descriptor occurs in CAT, CA_PID points to containing relevant to Entitlement Management Message (EMM)
Program bag.
In CA_descriptor, several important fields are as follows:
CA_system_ID: this field represents the CA system type being applicable to relevant ECM and/or EMM stream.Its value is user
Definition.
CA_PID: this field represents the PID of transport stream packet, containing the CA indicated by corresponding CA_system_ID in this bag
ECM or the EMM information of system, CA_PID the context at content (ECM or the EMM) place of the bag indicated determines, both by TS
PMT, CAT or program stream in stream_id field determine.
In the embodiment of the present application, described common interface CI card includes: condition reception CA module, described step 304 is concrete
Can include following sub-step:
Sub-step S51, described condition reception CA module is passed through described CAT Conditional Access Table CAT, is obtained corresponding empowerment management
Information EMM；
Condition reception CA module, it is also possible to be referred to as lesser calorie, smart card.Condition reception CA module stores individual subscriber divide
Join key PDK (Personal Distribute Key).
Condition reception CA module first passes through CA_PID corresponding to the CA_system_ID in CAT table, finds and CA_PID phase
Same EMM.
Sub-step S52, by described Program Map Table PMT, obtains corresponding Entitlement Control Message ECM；
Condition reception CA module, by the CA_PID corresponding for CA_system_ID in pmt table, finds identical with CA_PID
ECM.
Sub-step S53, uses Entitlement Management Message EMM, parses Control Word from described Entitlement Control Message ECM.
EMM has business key SK (Service Key) through PDK encryption.The password decryption be given by user is obtained
PDK, just can decrypt SK by PDK.
Having the CW that SK encrypts in ECM code stream, the SK that condition reception CA module uses deciphering to obtain decrypts CW.
Step 305, is sent to described television chip by described Control Word and described transport stream TS；Described television
Chip, in the described transport stream TS received, filters out described audio pack corresponding for Program Map Table PMT and video bag；
According to described Control Word, descramble described audio pack and video bag.
The Control Word obtained of deciphering is sent to TV section chip by CI card.The descrambler of television chip is according to controlling
The setting of word CW carries out descrambling audio pack and video bag.
In the embodiment of the present application, CI card receives transport stream TS and the Program Map Table PMT that television chip sends, and depends on
From Program Map Table PMT, Control Word is parsed according to CAT Conditional Access Table CAT；Control Word and TS stream are sent to TV by CI card
End chip, by the descrambler of television chip according to Control Word, completes the descrambling to TS stream.With employing CI in existing method
The mode that card carries out descrambling is compared, and in the embodiment of the present application, make use of relative performance higher television chip to carry out TS stream
Descrambling, improves the descrambling speed of TS stream.
With reference to Fig. 3, it is shown that the flow chart of steps of a kind of transport stream TS de-scrambling method embodiment of the application, the most permissible
Comprise the steps:
Step 401, television chip sends transport stream TS to common interface CI card；Described common interface CI card is used for using
Pre-conditioned reception table CAT parses Control Word from default Program Map Table PMT, by described Control Word and described biography
Defeated stream TS is sent to described television chip；
Step 402, receives Control Word and transport stream TS that described common interface CI card sends；
Step 403, receive described transport stream TS in, filter out described audio pack corresponding for Program Map Table PMT and
Video bag；
In the embodiment of the present application, described television chip includes: demultiplexer；Described step 403 specifically can include
Following sub-step:
Sub-step S61, described demultiplexer, in the described transport stream TS received, filters out described Program Map Table PMT
Corresponding audio pack and video bag.
The demultiplexer of television chip resolves TS stream packets and obtains bag mark PID, filters out regarding of correspondence according to PID
Frequency wraps people's audio pack.
Step 404, according to described Control Word, descrambles described audio pack and video bag.
In the embodiment of the present application, described television chip includes: descrambler；Described step 404 specifically can include as
Lower sub-step:
Sub-step S71, described descrambler, according to described Control Word, descrambles described audio pack and video bag.
Descrambler generates scrambling sequence according to Control Word.Then the scrambling sequence video bag to scrambling and video bag are used
Descramble.
In the embodiment of the present application, described method can also include:
Before described television chip sends transport stream TS to common interface CI card, described television chip receives radio frequency
Stream；
Described television chip, from described radio frequency stream, demodulates described transport stream TS.
Concrete, described television chip includes: tuner Tuner, and demodulator Demod；
Described television chip is from described radio frequency stream, and the step demodulating described transport stream TS includes:
Described tuner Tuner locks a frequency in described radio frequency stream；
Described demodulator Demod uses the frequency of locking, demodulates transport stream TS from described radio frequency stream.
In a kind of preferred exemplary of the embodiment of the present application, described common interface CI card is used for from described transport stream TS,
Parse described CAT Conditional Access Table CAT.
In this example, CAT Conditional Access Table CAT can be resolved by the demultiplexer in CI card and obtain.
In the another kind of preferred exemplary of the embodiment of the present application, described method can also include:
Described television chip sends described pre-conditioned reception table CAT to described common interface CI card.
CAT Conditional Access Table CAT can be obtained by television chip solution multiplexing.The demultiplexer of television chip, resolves TS stream
Packet obtains bag mark PID, acquires CAT Conditional Access Table CAT according to bag mark PID.Television chip will parse
CAT Conditional Access Table CAT is sent to CI card.In this example, CAT Conditional Access Table is separated out by the television chip solution of better performances
CAT, and receive table CAT without CI card analysis condition from TS flows.Television chip resolves the speed of CAT Conditional Access Table CAT more
Hurry up, thus save the parsing time of CAT Conditional Access Table CAT.
In a kind of preferred exemplary of the embodiment of the present application, described common interface CI card is used for from described transport stream TS,
Parse described Program Map Table PMT.
In the another kind of preferred exemplary of the embodiment of the present application, described method can also include:
Described television chip sends described default Program Map Table PMT to described common interface CI card.
In the embodiment of the present application, CI card receives transport stream TS and the Program Map Table PMT that television chip sends, and depends on
From Program Map Table PMT, Control Word is parsed according to CAT Conditional Access Table CAT；Control Word and TS stream are sent to TV by CI card
End chip, by the descrambler of television chip according to Control Word, completes the descrambling to TS stream.In the embodiment of the present application, profit
With relative performance higher television chip, TS stream is descrambled, improve the descrambling speed of TS stream.
In order to make those skilled in the art better understood when the embodiment of the present invention, below by an example to this
Bright embodiment is illustrated:
With reference to Fig. 4, it is shown that the schematic diagram of a kind of transport stream TS of the application descrambling.
In the embodiment of the present application.Television chip 50 includes: tuner 501, demodulator 502, descrambler 503, demultiplex
With device 504, decoder 505, CPU506.CI card 60 includes: demultiplexer 601, condition reception CA module 602, CPU603.
User passes through remote controller 70, sends the various control signals loading TV programme to the CPU506 of television chip,
The CPU506 of television chip 50 controls the CPU603 of CI card 60 and carries out various control operation.
The tuner 501 of television chip 50 receives radio frequency stream, and lock a frequency in frequency RF stream.Demodulator
502 frequencies using locking, demodulate the transport stream TS of scrambling from radio frequency stream.
The demultiplexer 601 of CI card 60, from the transport stream TS of scrambling, parses CAT Conditional Access Table CAT and Program Map Table
PMT.The condition reception CA module 602 of CI card 60, by CAT Conditional Access Table CAT, obtains corresponding Entitlement Management Message EMM；Pass through
Described Program Map Table PMT, obtains corresponding Entitlement Control Message ECM；Use Entitlement Management Message EMM, authorize control from described
Information ECM processed parses Control Word.
The TS stream of former state is sent to the demultiplexer 504 of television chip 50 by the demultiplexer 601 of CI card 60.CI card 60
Condition reception CA module 602 Control Word is sent to the descrambler 503 of television chip 50.Demultiplexing of television chip 50
From the TS of former state flows, audio pack corresponding for Program Map Table PMT and video bag is filtered out with device 504.The solution of television chip 50
Disturb device 503 according to Control Word, descrambling audio pack and video bag.The decoder 505 of television chip 50 is to audio pack after descrambling
It is decoded output with video bag.
It should be noted that for embodiment of the method, in order to be briefly described, therefore it is all expressed as a series of action group
Closing, but those skilled in the art should know, the embodiment of the present application is not limited by described sequence of movement, because depending on
According to the embodiment of the present application, some step can use other orders or carry out simultaneously.Secondly, those skilled in the art also should
Knowing, embodiment described in this description belongs to preferred embodiment, and involved action not necessarily the application implements
Necessary to example.
With reference to Fig. 5, it is shown that the structured flowchart of a kind of transport stream TS descrambler embodiment of the application, specifically can wrap
Include such as lower module:
It is positioned at the receiver module 801 of described common interface CI card, for receiving the transport stream TS that television chip sends；
It is positioned at the CAT Conditional Access Table acquisition module 802 of described common interface CI card, is used for obtaining CAT Conditional Access Table CAT；
It is positioned at the Program Map Table acquisition module 803 of described common interface CI card, is used for obtaining Program Map Table PMT；
It is positioned at the parsing module 804 of described common interface CI card, for according to described CAT Conditional Access Table CAT, from described joint
Mesh mapping table PMT parses Control Word；
It is positioned at the sending module 805 of described common interface CI card, for by described Control Word and described transport stream TS
It is sent to described television chip；Described television chip, in the described transport stream TS received, filters out described joint
Audio pack that mesh mapping table PMT is corresponding and video bag；According to described Control Word, descramble described audio pack and video bag.
In a kind of preferred exemplary of the embodiment of the present application, described CAT Conditional Access Table acquisition module 802 may include that
The CAT Conditional Access Table being positioned at described common interface CI card receives submodule, is used for receiving described television chip and sends
CAT Conditional Access Table CAT, described CAT Conditional Access Table CAT by described television chip from described transport stream TS resolve obtain.
In the another kind of preferred exemplary of the embodiment of the present application, described CAT Conditional Access Table acquisition module 802 may include that
It is positioned at the CAT Conditional Access Table analyzing sub-module of described common interface CI card, for parsing from described transport stream TS
Described CAT Conditional Access Table CAT.
In the embodiment of the present application, described common interface CI card includes demultiplexer；Described CAT Conditional Access Table resolves submodule
Block may include that
It is positioned at the CAT Conditional Access Table resolution unit of described demultiplexer, for parsing described bar from described transport stream TS
Part receives table CAT.
In a kind of preferred exemplary of the embodiment of the present application, described Program Map Table acquisition module 803 may include that
The Program Map Table being positioned at described common interface CI card receives submodule, is used for receiving described television chip and sends
Program Map Table PMT, described Program Map Table PMT by described television chip from described transport stream TS resolve obtain.
In the another kind of preferred exemplary of the embodiment of the present application, described Program Map Table acquisition module 803 may include that
It is positioned at the Program Map Table analyzing sub-module of described common interface CI card, for parsing from described transport stream TS
Described Program Map Table PMT.
In the embodiment of the present application, described common interface CI card includes demultiplexer；Described Program Map Table resolves submodule
Block includes:
It is positioned at the Program Map Table resolution unit of described demultiplexer, for parsing described joint from described transport stream TS
Mesh mapping table PMT.
In the embodiment of the present application, described common interface CI card includes: condition reception CA module, described parsing module 804
May include that
The Entitlement Management Message being positioned at described condition reception CA module obtains submodule, for by described CAT Conditional Access Table
CAT, obtains corresponding Entitlement Management Message EMM；
The Entitlement Control Message being positioned at described condition reception CA module obtains submodule, for by described Program Map Table
PMT, obtains corresponding Entitlement Control Message ECM；
It is positioned at the control word analyzing sub-module of described condition reception CA module, is used for using Entitlement Management Message EMM, from institute
State in Entitlement Control Message ECM and parse Control Word.
With reference to Fig. 6, it is shown that the structured flowchart of a kind of transport stream TS descrambler embodiment of the application, specifically can wrap
Include such as lower module:
It is positioned at the transport module 901 of television chip, for sending transport stream TS to common interface CI card；Described public connect
Mouth CI card is used for using pre-conditioned reception table CAT to parse Control Word from default Program Map Table PMT, by described control
Word CW and described transport stream TS are sent to described television chip；
It is positioned at the receiver module 902 of described television chip, for receiving the control word that described common interface CI card sends
CW and transport stream TS；
It is positioned at the filtering module 903 of described television chip, in the described transport stream TS received, filters out described
Audio pack that Program Map Table PMT is corresponding and video bag；
Be positioned at the descrambling module 904 of described television chip, for according to described Control Word, descramble described audio pack and
Video bag.
In a kind of preferred exemplary of the embodiment of the present application, described device can also include:
It is positioned at the CAT Conditional Access Table sending module of described television chip, described for sending to described common interface CI card
Pre-conditioned reception table CAT.
In another kind of preferred exemplary in the embodiment of the present application, described common interface CI card is for from described transport stream TS
In, parse described CAT Conditional Access Table CAT.
In a kind of preferred exemplary of the embodiment of the present application, described device also includes: be positioned at described television chip
Program Map Table sending module, for sending described default Program Map Table PMT to described common interface CI card.
In another kind of preferred exemplary in the embodiment of the present application, described common interface CI card is for from described transport stream TS
In, parse described Program Map Table PMT.
In the embodiment of the present application, described device can also include:
It is positioned at the RF flow receiver module of described television chip, is used at described television chip to common interface CI card
Before sending transport stream TS, described television chip receives radio frequency stream；
It is positioned at described television chip radio frequency stream demodulation module, for from described radio frequency stream, demodulates described transmission
Stream TS.
In the embodiment of the present application, described television chip includes: tuner Tuner, and demodulator Demod；
Described RF flow demodulation module may include that
It is positioned at the locking submodule of described tuner Tuner, for locking a frequency in described radio frequency stream；
It is positioned at the frequency demodulation submodule of described demodulator Demod, for using the frequency of locking, from described radio frequency stream
In demodulate transport stream TS.
In the embodiment of the present application, described television chip includes: demultiplexer；Described filtering module may include that
Filter module is flow through in the transmission being positioned at described demultiplexer, for, in the described transport stream TS received, filtering out
Described audio pack corresponding for Program Map Table PMT and video bag.
In the embodiment of the present application, described television chip includes: descrambler；Described descrambling module includes:
It is positioned at the control word descrambling submodule of described descrambler, for according to described Control Word, descrambles described audio pack
With video bag.
For device embodiment, due to itself and embodiment of the method basic simlarity, so describe is fairly simple, relevant
Part sees the part of embodiment of the method and illustrates.
Each embodiment in this specification all uses the mode gone forward one by one to describe, what each embodiment stressed is with
The difference of other embodiments, between each embodiment, identical similar part sees mutually.
Those skilled in the art are it should be appreciated that the embodiment of the embodiment of the present application can be provided as method, device or calculate
Machine program product.Therefore, the embodiment of the present application can use complete hardware embodiment, complete software implementation or combine software and
The form of the embodiment of hardware aspect.And, the embodiment of the present application can use one or more wherein include computer can
With in the computer-usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) of program code
The form of the computer program implemented.
The embodiment of the present application is with reference to method, terminal unit (system) and the computer program according to the embodiment of the present application
The flow chart of product and/or block diagram describe.It should be understood that can be by computer program instructions flowchart and/or block diagram
In each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.These can be provided
Computer program instructions sets to general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing terminals
Standby processor is to produce a machine so that held by the processor of computer or other programmable data processing terminal equipment
The instruction of row produces for realizing in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame
The device of the function specified.
These computer program instructions may be alternatively stored in and can guide computer or other programmable data processing terminal equipment
In the computer-readable memory worked in a specific way so that the instruction being stored in this computer-readable memory produces bag
Including the manufacture of command device, this command device realizes in one flow process of flow chart or multiple flow process and/or one side of block diagram
The function specified in frame or multiple square frame.
These computer program instructions also can be loaded on computer or other programmable data processing terminal equipment so that
On computer or other programmable terminal equipment, execution sequence of operations step is to produce computer implemented process, thus
The instruction performed on computer or other programmable terminal equipment provides for realizing in one flow process of flow chart or multiple flow process
And/or the step of the function specified in one square frame of block diagram or multiple square frame.
Although having been described for the preferred embodiment of the embodiment of the present application, but those skilled in the art once knowing base
This creativeness concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to
The all changes including preferred embodiment and falling into the embodiment of the present application scope and amendment.
Finally, in addition it is also necessary to explanation, in this article, the relational terms of such as first and second or the like be used merely to by
One entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or operation
Between exist any this reality relation or order.And, term " includes ", " comprising " or its any other variant meaning
Containing comprising of nonexcludability, so that include that the process of a series of key element, method, article or terminal unit not only wrap
Include those key elements, but also include other key elements being not expressly set out, or also include for this process, method, article
Or the key element that terminal unit is intrinsic.In the case of there is no more restriction, by wanting that statement " including ... " limits
Element, it is not excluded that there is also other identical element in including the process of described key element, method, article or terminal unit.
Above to a kind of transport stream TS de-scrambling method provided herein and a kind of transport stream TS descrambler, carry out
Being discussed in detail, principle and the embodiment of the application are set forth by specific case used herein, above example
Illustrate that being only intended to help understands the present processes and core concept thereof；Simultaneously for one of ordinary skill in the art, depend on
According to the thought of the application, the most all will change, in sum, this specification content
Should not be construed as the restriction to the application.
The application implements to disclose A1, a kind of transport stream TS de-scrambling method, including:
Common interface CI card receives the transport stream TS that television chip sends；
Obtain CAT Conditional Access Table CAT；
Obtain Program Map Table PMT；
According to described CAT Conditional Access Table CAT, from described Program Map Table PMT, parse Control Word；
Described Control Word and described transport stream TS are sent to described television chip；Described television chip is used for
In the described transport stream TS received, filter out described audio pack corresponding for Program Map Table PMT and video bag；According to described
Control Word, descrambles described audio pack and video bag.
A2, according to the method described in A1, the step of described acquisition CAT Conditional Access Table CAT includes:
Described common interface CI card receives the CAT Conditional Access Table CAT that described television chip sends, described CAT Conditional Access Table
CAT is obtained from the parsing of described transport stream TS by described television chip.
A3, according to the method described in A1, the step of described acquisition CAT Conditional Access Table CAT includes:
Described common interface CI card parses described CAT Conditional Access Table CAT from described transport stream TS.
A4, according to the method described in A3, described common interface CI card includes demultiplexer；Described common interface CI card is from institute
State and transport stream TS parses the step of described CAT Conditional Access Table CAT include:
Described demultiplexer, parses described CAT Conditional Access Table CAT from described transport stream TS.
A5, according to the method described in A1, the step of described acquisition Program Map Table PMT includes:
Described common interface CI card receives the Program Map Table PMT that described television chip sends, described Program Map Table
PMT is obtained from the parsing of described transport stream TS by described television chip.
A6, according to the method described in A1, the step of described acquisition Program Map Table PMT includes:
Described common interface CI card parses described Program Map Table PMT from described transport stream TS.
A7, according to the method described in A6, described common interface CI card includes demultiplexer；Described common interface CI card is from institute
State and transport stream TS parses the step of described Program Map Table PMT include:
Described demultiplexer, parses described Program Map Table PMT from described transport stream TS.
A8, according to the method described in A1, described common interface CI card includes: condition reception CA module, described in described foundation
CAT Conditional Access Table CAT, the step parsing Control Word from described Program Map Table PMT includes:
Described condition reception CA module passes through described CAT Conditional Access Table CAT, obtains corresponding Entitlement Management Message EMM；
By described Program Map Table PMT, obtain corresponding Entitlement Control Message ECM；
Use Entitlement Management Message EMM, from described Entitlement Control Message ECM, parse Control Word.
The embodiment of the present application also discloses B9, a kind of transport stream TS de-scrambling method, including:
Television chip sends transport stream TS to common interface CI card；Described common interface CI card is used for using pre-conditioned
Reception table CAT parses Control Word from default Program Map Table PMT, described Control Word and described transport stream TS is sent out
Deliver to described television chip；
Receive Control Word and transport stream TS that described common interface CI card sends；
In the described transport stream TS received, filter out described audio pack corresponding for Program Map Table PMT and video bag；
According to described Control Word, descramble described audio pack and video bag.
B10, according to the method described in B9, also include:
Described television chip sends described pre-conditioned reception table CAT to described common interface CI card.
B11, according to the method described in B9, described common interface CI card, for from described transport stream TS, parses described
CAT Conditional Access Table CAT.
B12, according to the method described in B9, also include:
Described television chip sends described default Program Map Table PMT to described common interface CI card.
B13, according to the method described in B9, described common interface CI card, for from described transport stream TS, parses described
Program Map Table PMT.
B14, according to the method described in B9, also include:
At described television chip before common interface CI card sends transport stream TS, described television chip receives radio frequency
RF flows；
Described television chip, from described radio frequency stream, demodulates described transport stream TS.
B15, according to the method described in B14, described television chip includes: tuner Tuner, and demodulator Demod；
Described television chip is from described radio frequency stream, and the step demodulating described transport stream TS includes:
Described tuner Tuner locks a frequency in described radio frequency stream；
Described demodulator Demod uses the frequency of locking, demodulates transport stream TS from described radio frequency stream.
B16, according to the method described in B9, described television chip includes: demultiplexer；Described in the described transmission received
In stream TS, the step filtering out described audio pack corresponding for Program Map Table PMT and video bag includes:
Described demultiplexer, in the described transport stream TS received, filters out described audio frequency corresponding for Program Map Table PMT
Bag and video bag.
B17, according to the method described in B9, described television chip includes: descrambler；It is described according to described Control Word,
The step descrambling described audio pack and video bag includes:
Described descrambler, according to described Control Word, descrambles described audio pack and video bag.
The embodiment of the present application also discloses C18, a kind of transport stream TS descrambler, including:
It is positioned at the receiver module of described common interface CI card, for receiving the transport stream TS that television chip sends；
It is positioned at the CAT Conditional Access Table acquisition module of described common interface CI card, is used for obtaining CAT Conditional Access Table CAT；
It is positioned at the Program Map Table acquisition module of described common interface CI card, is used for obtaining Program Map Table PMT；
It is positioned at the parsing module of described common interface CI card, for according to described CAT Conditional Access Table CAT, reflects from described program
Firing table PMT parses Control Word；
It is positioned at the sending module of described common interface CI card, for described Control Word and described transport stream TS being sent
To described television chip；Described television chip, in the described transport stream TS received, filters out described program and reflects
Audio pack that firing table PMT is corresponding and video bag；According to described Control Word, descramble described audio pack and video bag.
C19, according to the device described in C18, described CAT Conditional Access Table acquisition module includes:
The CAT Conditional Access Table being positioned at described common interface CI card receives submodule, is used for receiving described television chip and sends
CAT Conditional Access Table CAT, described CAT Conditional Access Table CAT by described television chip from described transport stream TS resolve obtain.
C20, according to the device described in C18, described CAT Conditional Access Table acquisition module includes:
It is positioned at the CAT Conditional Access Table analyzing sub-module of described common interface CI card, for parsing from described transport stream TS
Described CAT Conditional Access Table CAT.
C21, according to the device described in C20, described common interface CI card includes demultiplexer；Described CAT Conditional Access Table resolves
Submodule includes:
It is positioned at the CAT Conditional Access Table resolution unit of described demultiplexer, for parsing described bar from described transport stream TS
Part receives table CAT.
C22, according to the device described in C18, described Program Map Table acquisition module includes:
The Program Map Table being positioned at described common interface CI card receives submodule, is used for receiving described television chip and sends
Program Map Table PMT, described Program Map Table PMT by described television chip from described transport stream TS resolve obtain.
C23, according to the device described in C18, described Program Map Table acquisition module includes:
It is positioned at the Program Map Table analyzing sub-module of described common interface CI card, for parsing from described transport stream TS
Described Program Map Table PMT.
C24, according to the device described in C23, described common interface CI card includes demultiplexer；Described Program Map Table resolves
Submodule includes:
It is positioned at the Program Map Table resolution unit of described demultiplexer, for parsing described joint from described transport stream TS
Mesh mapping table PMT.
C25, according to the device described in C18, described common interface CI card includes: condition reception CA module, described parsing mould
Block includes:
The Entitlement Management Message being positioned at described condition reception CA module obtains submodule, for by described CAT Conditional Access Table
CAT, obtains corresponding Entitlement Management Message EMM；
The Entitlement Control Message being positioned at described condition reception CA module obtains submodule, for by described Program Map Table
PMT, obtains corresponding Entitlement Control Message ECM；
It is positioned at the control word analyzing sub-module of described condition reception CA module, is used for using Entitlement Management Message EMM, from institute
State in Entitlement Control Message ECM and parse Control Word.
The embodiment of the present application also discloses D26, a kind of transport stream TS descrambler, including:
It is positioned at the transport module of television chip, for sending transport stream TS to common interface CI card；Described common interface
CI card is used for using pre-conditioned reception table CAT to parse Control Word from default Program Map Table PMT, by described control word
CW and described transport stream TS are sent to described television chip；
Be positioned at the receiver module of described television chip, for receive described common interface CI card transmission Control Word with
And transport stream TS；
It is positioned at the filtering module of described television chip, for, in the described transport stream TS received, filtering out described joint
Audio pack that mesh mapping table PMT is corresponding and video bag；
It is positioned at the descrambling module of described television chip, for according to described Control Word, descrambles described audio pack and regard
Frequency bag.
D27, according to the device described in D26, also include:
It is positioned at the CAT Conditional Access Table sending module of described television chip, described for sending to described common interface CI card
Pre-conditioned reception table CAT.
D28, according to the device described in D26, described common interface CI card, for from described transport stream TS, parses described
CAT Conditional Access Table CAT.
D29, according to the device described in D26, also include:
It is positioned at the Program Map Table sending module of described television chip, described for sending to described common interface CI card
Preset Program Map Table PMT.
D30, according to the device described in D26, described common interface CI card, for from described transport stream TS, parses described
Program Map Table PMT.
D31, according to the device described in D26, also include:
It is positioned at the RF flow receiver module of described television chip, is used at described television chip to common interface CI card
Before sending transport stream TS, described television chip receives radio frequency stream；
It is positioned at described television chip radio frequency stream demodulation module, for from described radio frequency stream, demodulates described transmission
Stream TS.
D32, according to the device described in D31, described television chip includes: tuner Tuner, and demodulator Demod；
Described RF flow demodulation module includes:
It is positioned at the locking submodule of described tuner Tuner, for locking a frequency in described radio frequency stream；
It is positioned at the frequency demodulation submodule of described demodulator Demod, for using the frequency of locking, from described radio frequency stream
In demodulate transport stream TS.
D33, according to the device described in D26, described television chip includes: demultiplexer；Described filtering module includes:
Filter module is flow through in the transmission being positioned at described demultiplexer, for, in the described transport stream TS received, filtering out
Described audio pack corresponding for Program Map Table PMT and video bag.
D34, according to the device described in D26, described television chip includes: descrambler；Described descrambling module includes:
It is positioned at the control word descrambling submodule of described descrambler, for according to described Control Word, descrambles described audio pack
With video bag.
Claims (10)
1. a transport stream TS de-scrambling method, it is characterised in that including:
Common interface CI card receives the transport stream TS that television chip sends；
Obtain CAT Conditional Access Table CAT；
Obtain Program Map Table PMT；
According to described CAT Conditional Access Table CAT, from described Program Map Table PMT, parse Control Word；
Described Control Word and described transport stream TS are sent to described television chip；Described television chip is for connecing
In the described transport stream TS received, filter out described audio pack corresponding for Program Map Table PMT and video bag；According to described control
Word CW, descrambles described audio pack and video bag.
Method the most according to claim 1, it is characterised in that the step of described acquisition CAT Conditional Access Table CAT includes:
Described common interface CI card receive described television chip send CAT Conditional Access Table CAT, described CAT Conditional Access Table CAT by
Described television chip resolves from described transport stream TS and obtains.
Method the most according to claim 1, it is characterised in that the step of described acquisition CAT Conditional Access Table CAT includes:
Described common interface CI card parses described CAT Conditional Access Table CAT from described transport stream TS.
Method the most according to claim 1, it is characterised in that the step of described acquisition Program Map Table PMT includes:
Described common interface CI card receive described television chip send Program Map Table PMT, described Program Map Table PMT by
Described television chip resolves from described transport stream TS and obtains.
Method the most according to claim 1, it is characterised in that the step of described acquisition Program Map Table PMT includes:
Described common interface CI card parses described Program Map Table PMT from described transport stream TS.
6. a transport stream TS de-scrambling method, it is characterised in that including:
Television chip sends transport stream TS to common interface CI card；Described common interface CI card is used for using pre-conditioned reception
Table CAT parses Control Word from default Program Map Table PMT, described Control Word and described transport stream TS is sent to
Described television chip；
Receive Control Word and transport stream TS that described common interface CI card sends；
In the described transport stream TS received, filter out described audio pack corresponding for Program Map Table PMT and video bag；
According to described Control Word, descramble described audio pack and video bag.
Method the most according to claim 6, it is characterised in that also include:
Described television chip sends described pre-conditioned reception table CAT to described common interface CI card.
Method the most according to claim 6, it is characterised in that described common interface CI card is for from described transport stream TS
In, parse described CAT Conditional Access Table CAT.
9. a transport stream TS descrambler, it is characterised in that including:
It is positioned at the receiver module of described common interface CI card, for receiving the transport stream TS that television chip sends；
It is positioned at the CAT Conditional Access Table acquisition module of described common interface CI card, is used for obtaining CAT Conditional Access Table CAT；
It is positioned at the Program Map Table acquisition module of described common interface CI card, is used for obtaining Program Map Table PMT；
It is positioned at the parsing module of described common interface CI card, for according to described CAT Conditional Access Table CAT, from described Program Map Table
PMT parses Control Word；
It is positioned at the sending module of described common interface CI card, for described Control Word and described transport stream TS are sent to institute
State television chip；Described television chip, in the described transport stream TS received, filters out described Program Map Table
Audio pack that PMT is corresponding and video bag；According to described Control Word, descramble described audio pack and video bag.
10. a transport stream TS descrambler, it is characterised in that including:
It is positioned at the transport module of television chip, for sending transport stream TS to common interface CI card；Described common interface CI card
For using pre-conditioned reception table CAT to parse Control Word from default Program Map Table PMT, by described Control Word with
And described transport stream TS is sent to described television chip；
It is positioned at the receiver module of described television chip, for receiving Control Word and the biography that described common interface CI card sends
Defeated stream TS；
It is positioned at the filtering module of described television chip, for, in the described transport stream TS received, filtering out described program and reflect
Audio pack that firing table PMT is corresponding and video bag；
It is positioned at the descrambling module of described television chip, for according to described Control Word, descrambles described audio pack and video bag.
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| CN201610566223.3A CN106210816A (en) | 2016-07-18 | 2016-07-18 | A kind of transport stream TS de-scrambling method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610566223.3A CN106210816A (en) | 2016-07-18 | 2016-07-18 | A kind of transport stream TS de-scrambling method and device |
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Application publication date: 20161207 |