CN106713977A - Network playing method and device - Google Patents
Network playing method and device Download PDFInfo
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- CN106713977A CN106713977A CN201611204832.0A CN201611204832A CN106713977A CN 106713977 A CN106713977 A CN 106713977A CN 201611204832 A CN201611204832 A CN 201611204832A CN 106713977 A CN106713977 A CN 106713977A
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- network
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- entitlement
- flow data
- management message
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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
- H04N21/43—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
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4367—Establishing a secure communication between the client and a peripheral device or smart card
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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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
-
- 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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4627—Rights management associated to the content
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- Engineering & Computer Science (AREA)
- Databases & Information Systems (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a network playing method and device. The method comprises the steps of: acquiring a conditional access table and a program mapping table of network dense flow data corresponding to a current program; acquiring an entitlement management message network address obtained by interaction of the conditional access table and a smart card and an entitlement control message network address obtained by interaction of the program mapping table and the smart card; accessing a network according to the entitlement management message network address and the entitlement control message network address, acquiring entitlement management message network data and entitlement control message network data, separating the entitlement management message network data into entitlement management message target data, and separating the entitlement control message network data into entitlement control message target data; and acquiring control words obtained by interaction of the entitlement management message target data, the entitlement control message target data and the smart card, and on the basis of the control words, carrying out descrambling playing on the network dense flow data. The control words for controlling playing are acquired by interaction and descramble of the network dense flow data and the smart card, so that network playing is implemented.
Description
Technical field
The invention mainly relates to netcast technical field, specifically, more particularly to a kind of netcast method and its
Device.
Background technology
With advancing by leaps and bounds for integrated circuit technique and digital processing technology, the widely used digital skill of cable television system
Art.DTV is exactly that information source is encoded using digital compression, and transmission uses digital communication technology, is connect using DTV in terminal
Receive (Set Top Box) to be decoded, realize the broadcasting of TV.Wherein the transmission medium of signal is cable of cable TV (i.e. cable
Line), the signal for being encoded digital compression by cable lines is delivered to Set Top Box from information source carries out decoding broadcasting.Which results in
The transmission of signal is too strong to the dependence of cable lines, once there is the situation of cable line dropouts, signal can not be delivered to
Set top box side is decoded, and TV can not then be played, and stability in use is low.
The content of the invention
It is a primary object of the present invention to provide a kind of netcast method and device, it is intended to solve prior art pair
Cable lines signal relies on higher, uses unstable problem.
To achieve the above object, the present invention provides a kind of netcast method, and the netcast method includes following step
Suddenly：
Obtain the CAT Conditional Access Table and Program Map Table of the close flow data of network corresponding with actual program；
Obtain CAT Conditional Access Table interacted with smart card obtained by the Entitlement Management Message network address and Program Map Table and
The Entitlement Control Message network address obtained by smart card interaction；
Network is accessed according to the Entitlement Management Message network address and the Entitlement Control Message network address, empowerment management letter is obtained
Breath network data and Entitlement Control Message network data, and Entitlement Management Message network data is separated into Entitlement Management Message mesh
Mark data, Entitlement Control Message network data is separated into Entitlement Control Message target data；
Obtain the control obtained by the interaction of Entitlement Management Message target data, Entitlement Control Message target data and smart card
Word, and descrambling broadcasting is carried out to the close flow data of network based on control word.
Preferably, it is described and Entitlement Management Message network data is separated into Entitlement Management Message target data, authorize control
The step of information network data separating processed is Entitlement Control Message target data includes：
Entitlement Management Message network data and Entitlement Control Message network data are divided into multiple transport stream packets by control, and
This multiple transport stream packets is mixed into close flow data and is multiplexed with mixing flow data；
Obtain the Entitlement Management Message target data and Entitlement Control Message target data obtained by mixed flow data filtering.
Preferably, the acquisition Entitlement Management Message target data, Entitlement Control Message target data and smart card interaction
The control word of gained, and based on control word to the close flow data of network carry out descrambling play the step of include：
Control Entitlement Management Message target data and smart card interaction, obtain business key；
According to business key, Entitlement Control Message target data is decrypted, obtain the control word after decryption；
According to control word, the close flow data of network is descrambled, obtain initial data, and initial data is played out.
Preferably, the step of CAT Conditional Access Table and Program Map Table of the network close flow data for obtaining actual program
Include before：
When cable of cable TV line dropout is detected, switching condition access library is netcast pattern, and is obtained
The close flow data of network corresponding with actual program.
Preferably, it is described to take Entitlement Management Message target data, Entitlement Control Message target data and smart card interaction institute
The control word for obtaining, and the close flow data of network is carried out based on control word also including after the step of descrambling is played：
When switching program instructions are received, the network address of the close flow data of more switching network；
According to the network address after replacing, the CAT Conditional Access Table that obtains the close flow data of network and Program Map Table are performed
Step.
Additionally, to achieve the above object, the present invention also proposes a kind of netcast device, the netcast device bag
Include：
First acquisition module, CAT Conditional Access Table and program for obtaining the close flow data of network corresponding with actual program
Mapping table；
Second acquisition module, for obtain CAT Conditional Access Table interacted with smart card obtained by the Entitlement Management Message network address
And Program Map Table interacted with smart card obtained by the Entitlement Control Message network address；
Separation module, for accessing network according to the Entitlement Management Message network address and the Entitlement Control Message network address,
Entitlement Management Message network data and Entitlement Control Message network data are obtained, and Entitlement Management Message network data is separated into
Entitlement Management Message target data, Entitlement Control Message network data is separated into Entitlement Control Message target data；
Descrambling module, hands over for obtaining Entitlement Management Message target data, Entitlement Control Message target data and smart card
Control word obtained by mutually, and descrambling broadcasting is carried out to the close flow data of network based on control word.
Preferably, the separation module includes：
First control unit, for controlling to divide Entitlement Management Message network data and Entitlement Control Message network data
It is multiple transport stream packets, and this multiple transport stream packets is mixed into close flow data to be multiplexed with mixing flow data；
First acquisition unit, for obtaining Entitlement Management Message target data and mandate control obtained by mixed flow data filtering
Information object data processed.
Preferably, the descrambling module includes：
Second control unit, for controlling Entitlement Management Message target data and smart card to interact, obtains business key；
Second acquisition unit, for according to business key, being decrypted to Entitlement Control Message target data, after obtaining decryption
Control word；
Descrambling unit, for according to control word, descrambling to the close flow data of network, obtains initial data, and to original
Data are played out.
Preferably, the netcast device also includes：
Handover module, for when cable of cable TV line dropout is detected, switching condition access library to be broadcast for network
Mode playback, and obtain the close flow data of network corresponding with actual program.
Preferably, the netcast device also includes：
Change module, for receive switching program instructions when, the network address of the close flow data of more switching network；
Performing module, obtained for according to the network address after replacing, performing the CAT Conditional Access Table of the close flow data of network with
And the step of Program Map Table.
Netcast method proposed by the present invention, obtains the CAT Conditional Access Table of the close flow data of network corresponding with actual program
And Program Map Table；Obtain CAT Conditional Access Table interacted with smart card obtained by the Entitlement Management Message network address and program reflect
Firing table interacted with smart card obtained by the Entitlement Control Message network address；According to the Entitlement Management Message network address and authorization control
Information network address accesses network, obtains Entitlement Management Message network data and Entitlement Control Message network data, and will authorize
Management information network data is separated into Entitlement Management Message target data, and Entitlement Control Message network data is separated into authorization control
Information object data；Obtain obtained by the interaction of Entitlement Management Message target data, Entitlement Control Message target data and smart card
Control word, and descrambling broadcasting is carried out to the close flow data of network based on control word.Technical scheme is by by the close stream of network
Control word is obtained after data and smart card interaction descrambling, so as to realize authorizing the broadcasting of program by control word.For broadcasting
The program put, during cable line dropouts, can automatically switch to netcast, have no effect on the broadcasting of program, it is to avoid
Cable line dropouts, it is impossible to watch the situation of program, be user-friendly to.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of netcast method first embodiment of the invention；
Fig. 2 is the schematic flow sheet of netcast method second embodiment of the invention；
Fig. 3 is the schematic flow sheet of netcast method 3rd embodiment of the invention；
Fig. 4 is the high-level schematic functional block diagram of netcast device first embodiment of the invention；
Fig. 5 is the refinement high-level schematic functional block diagram of the separation module of netcast device second embodiment of the invention；
Fig. 6 is the refinement high-level schematic functional block diagram of the descrambling module of netcast device 3rd embodiment of the invention；
Fig. 7 is the high-level schematic functional block diagram of netcast device fourth embodiment of the invention；
Fig. 8 is the high-level schematic functional block diagram of the embodiment of netcast device the 5th of the invention；
Fig. 9 is netcast method and device TS bag data structural representations of the invention；
Figure 10 is netcast method and device data transfer schematic diagram of a scenario of the invention.
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention proposes a kind of netcast method, refer to Fig. 1, in the first embodiment, the netcast method bag
Include following steps：
Step S10, obtains the CAT Conditional Access Table and Program Map Table of the close flow data of network corresponding with actual program；
Current cable system realizes the management and control of cable TV subscriber, wherein conditional access by the way of conditional access
Realized by condition reception storehouse (CA storehouses).Only when the log-on message of user is consistent with the authority information of registration, and
License fee use being paid on time, not having arrearage situation, cable television operators could provide the user with connecing for access in front end system
Mouth or path, user terminal access this interface or path, signal are demultiplexed by special equipment, descramble, decoding etc.
The process of series completes TV signal rating.The user for possessing mandate is set legally to use a certain item business, and the use of unauthorized
Family can not use this business, it is ensured that the user that only pay or will pay can just watch selected program, not
Paying customer can not then watch program.
Front end system realizes the encryption scrambling of signal, and the signal transmission that encryption is scrambled to user terminal, user terminal is utilized
CA storehouses and smart card TV reception.Wherein encrypting the signal of scrambling needs be packaged into before transmission to meet MPEG-2 marks
Accurate transport stream (i.e. TS) bag, MPEG-2 be the video that MPEG (Moving Picture Experts Group) is organized to set up and
Audio lossy compression method standard, single or multiple data are synthesized by one or more audios, video or other elementary streams
Stream, to be adapted to storage and transmit, and re-starts packing coding to it and forms code stream (i.e. ES).The various times are inserted in ES
The information such as mark, system control, are finally sent to channel coding and form transport stream (TS) bag with modulator, while TS bags are endowed
One different identifier (i.e. PID), for the data type that identification TS bags are carried.
Because TS bags quantity is a lot, in order to allow user terminal to be correctly found required code stream information, MPEG-2 is defined
Program information table (i.e. PSI), the effect of PSI is user terminal is set automatically and guide decoder to be decoded.PSI packets
Program Association Table (i.e. PAT), condition reception information table (i.e. CAT) and Program Map Table (i.e. PMT) are included, and network information table is (i.e.
NIT).Pat table includes the PMT_PID that all Program Map Tables in TS bags are each program, transport stream ID etc.；Wrapped in pmt table
Include elementary stream information i.e. video information, the audio-frequency information of each program；Mandate feelings of the CAT indicators to the user in specific CA storehouses
Condition, contains the CA_System_ID for identifying specific CA storehouses；NIT tables include that the physics of all of TS bags in the digital tv network is passed
Defeated net information, channel tuning parameter, frequency, symbol rate comprising program etc., these information allow user terminal according to
The selection at family changes channel, tuner parameters, correctly decodes out TS bags with little delay or no-delayly.Rating certain program
When from PAT obtain related-program PMT pid value, found out from TS bags according to this pid value corresponding with this pid value
PMT, according to corresponding PMT, obtains the pid value of the code stream for constituting this related-program, is leached according to this pid value and regarded accordingly
Frequently, the elementary stream such as audio and data, is restored to primary signal after decoding, carries out rating broadcasting.
Netcast method of the invention, the signal for encrypting scrambling derives from network, and its transmission means is different from wired electricity
Depending on encryption scrambled signals, it is necessary to the CA storehouses for being provided with netcast mechanism could be realized.When netcast is carried out, from network
The signal of encryption scrambling, the i.e. close flow data of network are obtained, this data is carried out demultiplexing process by control.Wherein it is demultiplexing as multiplexing
Inverse process, multiplexing be by video, audio compression packing after elementary stream and assistance data be multiplexed and to form TS bags, so demultiplexing
With being that the close flow data of network is decomposed into elementary stream and assistance data.TS bags are the bit stream formats based on Packet, each
Bag is 188 bytes, 192 bytes or 204 bytes, packet header and 184 data of byte of 188 bytes by 4 bytes
Composition, the TS bags of 192 bytes are that 4 verification datas of byte are increased on the basis of 188 bytes, 204 TS of byte
Stream is the CRC check data that 16 bytes are added after 188 bytes, and extended formatting is the same.Packet header includes a bag mark
Symbol PID, used as the unique mark of bag, the PID of pat table is 0x0000, and the PID of CAT is 0x0001.When user determines that rating is a certain
Program, the PID related to this program is obtained for the pat table and PID of 0x0000 are the CAT tables of 0x0001 by demultiplexing process,
The pid value of pmt table is known by pat table, the pmt table corresponding with this pid value is found out from TS bags according to this pid value, so that
Realize obtaining CAT tables and pmt table, i.e. CAT Conditional Access Table and Program Map Table from close flow data.
Step S20, obtain CAT Conditional Access Table interacted with smart card obtained by the Entitlement Management Message network address and program
Mapping table interacted with smart card obtained by the Entitlement Control Message network address；
Specifically, the index EMM_Pid for obtaining Entitlement Management Message (i.e. EMM) is also included in CAT tables, is passed through
The CA_System_ID and EMM_Pid contained in CAT tables, you can obtain the EMM information in CA storehouses where user.EMM Information applications
The program that can be seen in user management, including address, such as authorized user message, user or time period, the whether paid receipts of user
Depending on taking.Its management be user access be " what information ", which type of " authority " user is awarded.Also wrapped in pmt table
Include with the close many Entitlement Control Messages of CA (i.e. ECM)；For the encryption situation of program, pmt table contains CA_System_ID
And which kind of CA storehouses encryption ECM_PID, CA_System_ID are for program, ECM_PID is used to inform how user searches for ECM.
ECM information is used for program, including programme information source, time, the programme information such as classifying content and program price.Obtaining
After CAT tables and pmt table, CAT tables, pmt table are interacted with smart card respectively, storage is obtained by the descrambling of smart card respectively
The EMM network address of EMM network datas and the ECM network address of storage ECM network datas.
Step S30, network is accessed according to the Entitlement Management Message network address and the Entitlement Control Message network address, and acquisition is awarded
Power management information network data and Entitlement Control Message network data, and Entitlement Management Message network data is separated into mandate pipe
Reason information object data, Entitlement Control Message network data is separated into Entitlement Control Message target data；
In embodiment of the present invention, after the EMM network address and the ECM network address is obtained, according to the EMM networks
Address and the ECM network address access network, to obtain EMM network datas and ECM network datas.EMM network numbers are obtained from network
Real-time change during according to the information carried with ECM network datas, is stream data, and does not carry channel tuning parameter, the frequency of program
The auxiliary data informations such as rate, symbol rate, it is impossible to correctly decode TS bags.So that by this crossfire EMM network datas and ECM
Network data is mixed into close flow data after being packaged into TS bags, and EMM target datas and ECM mesh are separated into after carrying out demultiplexing filtering
Mark data.
Step S40, obtains Entitlement Management Message target data, Entitlement Control Message target data and smart card interaction gained
Control word, and descrambling broadcasting is carried out to the close flow data of network based on control word.
The business key (i.e. SK) by individual subscriber key (i.e. PDK) encryption is contained in EMM target datas,
Contained in ECM by control word (i.e. CW) information after SK encryptions.PDK solidifies in smart card, and is deposited with encrypting formation
Storage, user provides password and is decrypted.EMM data and smart card are interacted, and the SK in EMM, root are decrypted by the PDK of smart card
CW i.e. can obtain to ECM decryption according to SK.Hereafter control CW descrambles to the close flow data of network, recovers initial data, former to this
Beginning data play out i.e. achievable user watched.
The netcast method of the present embodiment includes step：Obtain the condition of the close flow data of network corresponding with actual program
Receive table and Program Map Table；Obtain CAT Conditional Access Table interacted with smart card obtained by the Entitlement Management Message network address and
Program Map Table interacted with smart card obtained by the Entitlement Control Message network address；According to the Entitlement Management Message network address and awarding
The power control information network address accesses network, obtains Entitlement Management Message network data and Entitlement Control Message network data, and
Entitlement Management Message network data is separated into Entitlement Management Message target data, Entitlement Control Message network data is separated into awards
Power control information target data；Obtain the interaction of Entitlement Management Message target data, Entitlement Control Message target data and smart card
The control word of gained, and descrambling broadcasting is carried out to the close flow data of network based on control word.Technical scheme is by obtaining
CAT Conditional Access Table (CAT), the Program Map Table (PMT) of the close flow data of network are believed with the authorization control obtained by smart card interaction respectively
Breath (EMM) network address, Entitlement Management Message (ECM) network address, and accessed according to the EMM network address and the ECM network address
Network, so as to obtain EMM network datas and ECM network datas；Separate EMM network datas, ECM network datas and obtain EMM targets
Data, ECM target datas；And then control the interaction of EMM target datas, ECM target datas and smart card to obtain control word, based on control
Word processed carries out descrambling broadcasting to the close flow data of network, realizes netcast.Netcast method of the invention, it is adaptable to cable
Line dropout, network signal is normal or is fitted without cable lines, but is mounted with the situation of netting twine, by CA storehouses and intelligence
The authorization message that interaction descrambling can be blocked is preserved within a smart card, as long as user carries smart card, so that it may in differences such as hotel, sight spots
The program of watching authorization on the distinct device in place.
Further, it is described and Entitlement Management Message network data is separated into Entitlement Management Message target data, authorize
The step of control information network data is separated into Entitlement Control Message target data includes：
Entitlement Management Message network data and Entitlement Control Message network data are divided into multiple biographies by step S31, control
Defeated stream bag, and this multiple transport stream packets is mixed into close flow data is multiplexed with mixing flow data；
Step S32, obtains the Entitlement Management Message target data and Entitlement Control Message mesh obtained by mixed flow data filtering
Mark data.
In technical scheme, the EMM network datas and ECM obtained by the EMM network address and the ECM network address
Network data is stream data, it is necessary to carry out separating the signal that could further obtain needs.Specifically, Fig. 9, crossfire be refer to
Data IP Datagram1 include IP (IP Header), TCP or UDP (TCP or UDP Header) and data
(Data).Stream data is divided into multiple TS bags by control, and TS is surrounded by 188 bytes, 192 bytes or 204 three kinds of bytes
Form, three kinds of forms all include 4 byte first codes (TS Header) and 184 byte datas (Data), wherein 192 bytes
TS bags be that 4 verification datas of byte are increased on the basis of 188 bytes, 204 TS bags of byte are than 188 bytes
The many 16 byte verification datas of TS bags.When data division is carried out, drawn according to the form of 188 or 192 or 204 bytes
It is divided into TS Packet1, TS Packet2 and TS Packet3, when TS Packet4 are divided into, data are less than 188 or 192
Or 204 bytes, now need the data for increasing Adaptation to be filled, form 188 bytes or 192 bytes
Or 204 complete TS bags of byte.After the completion of the division of TS bags, this multiple TS cladding is mixed into close flow data with (Mux)
In, and mixed close flow data demultiplex by the filter (Filter) in CA storehouses be filtrated to get what is needed with CA storehouses
EMM target datas and ECM target datas.
Further, the acquisition Entitlement Management Message target data, Entitlement Control Message target data and smart card are handed over
Mutually gained control word, and based on control word to the close flow data of network carry out descrambling play the step of include：
Step S41, control Entitlement Management Message target data and smart card interaction, obtain business key；
Step S42, according to business key, decrypts to Entitlement Control Message target data, obtains the control word after decryption；
Step S43, according to control word, descrambles to the close flow data of network, obtains initial data, and initial data is entered
Row is played.
In the technical scheme of this programme, after EMM target datas and ECM target datas are filtered out from close flow data, will
EMM target datas and the smart card interaction for obtaining, in decrypting EMM target datas by the individual subscriber key PDK of smart card
SK, according to SK to ECM target datas decryption i.e. can obtain CW.According to the CW for decrypting, descrambler (descrambler) is to net
The close flow data of network is descrambled, and recovers initial data, i.e. achievable user is played out to this initial data and is entered by network
Row rating.
Further, Fig. 2 is refer to, on the basis of inventive network player method first embodiment, proposes that network is broadcast
The second embodiment of method is put, in a second embodiment, the CAT Conditional Access Table of the close flow data of network for obtaining actual program
And include before the step of Program Map Table：
Step S50, when cable of cable TV line dropout is detected, switching condition access library is netcast mould
Formula, and obtain the close flow data of network corresponding with actual program.
In an embodiment of the present invention, user carries out TV reception by cable lines, there is the interference of some signals
In the case of cause cable line dropouts, when now detecting cable line dropouts, control CA storehouses are switched into network
Play mode, to realize the treatment to network data.Because that can be stored to the programme information played when cable lines are played,
During cable line dropouts, the TV programme phase that the programme information that can be stored according to this is played by Network Capture with cable lines
The close flow data of network answered.Wherein intelligible, the close flow data of network carrys out automatic network, so before the close flow data of network is obtained
Need to know the address of the close flow data of network, the close flow data of network is obtained with by this address.Specifically, by the network information
Increase the mode of descriptor in table NIT, obtain the network address of the close flow data of network, identifier descriptor_ described in it
Tag is used to distinguish descriptor, when its value is 0X05, the network address for obtaining encrypted audio/video data, i.e., close flow data
The network address.In the case of CA storehouses non-network play mode, i.e. cable lines signal are normal, by this descriptor acquiring net
The network address of the close flow data of network, and this network address can be multiple, can pass through to change accordingly when changing program so as to user
The network address obtains the close flow data of network that user needs.In the case of cable line dropouts, you can by this network ground
Location obtains the close flow data of network.Control word is obtained according to the close flow data of this network by the operation such as deciphering and descrambling to believe cable lines
Number lose before TV programme continue play.This operation is carried out automatically, and user is not aware that cable line signals occurred to be lost
Lose, do not influence user to watch.
Further, Fig. 3 is refer to, on the basis of inventive network player method second embodiment, proposes that network is broadcast
The 3rd embodiment of method is put, it is in the third embodiment, described to take Entitlement Management Message target data, Entitlement Control Message target
Data and smart card interaction obtained by control word, and based on control word to the close flow data of network carry out descrambling play the step of after
Also include：
Step S60, when switching program instructions are received, the network address of the close flow data of more switching network；
Step S70, according to the network address after replacing, performs the CAT Conditional Access Table and program for obtaining the close flow data of network
The step of mapping table.
Understandably, during rating is carried out there is the situation of switching program in user.Consolidated network address is same
Time can only play same program, realize the switching of program, then the network address of the inevitable first close flow data of more switching network.
When receiving the switching program instructions that user sends, the network address to the close flow data of network is changed, and according to replacing after
The network address, obtain the close flow data of network CAT tables and pmt table.Figure 10 is refer to, according to the close fluxion of network after replacing
According to the network address obtain the close flow data of network (TS Inject), by this network close flow data demultiplexing (i.e. Demux) after,
Obtain the CAT tables and pmt table of the close flow data of this network；Control CAT tables, pmt table are interacted with smart card Smartcard respectively,
The Entitlement Control Message network address and the Entitlement Management Message network address (ECM/EMM data NetWork after being interacted
Address)；Network is accessed according to the EMM network address and the ECM network address, EMM network datas and ECM network datas is obtained
Stream data；The stream data of EMM network datas and ECM network datas is packaged into multiple TS bags, multiple TS bags are by multiplexing
(i.e. Mux) is mixed into close flow data, and by this mixed close flow data by demultiplexing (demux) and filtering
(Filter) EMM target datas and ECM target datas are separated into.This EMM target data, ECM target datas and smart card are handed over
Mutually, the control word (CW KEY) after being interacted, thereafter according to control word, descrambler (descrambler) is to the close fluxion of network
According to being descrambled, to recover initial data, this initial data to be played out be capable of achieving and cuts platform broadcasting.
The present invention also provides a kind of netcast device, reference picture 4, and in one embodiment, the network that the present invention is provided is broadcast
Putting device includes：
First acquisition module 10, CAT Conditional Access Table and section for obtaining the close flow data of network corresponding with actual program
Mesh mapping table；
Current cable system realizes the management and control of cable TV subscriber, wherein conditional access by the way of conditional access
Realized by condition reception storehouse (CA storehouses).Only when the log-on message of user is consistent with the authority information of registration, and
License fee use being paid on time, not having arrearage situation, cable television operators could provide the user with connecing for access in front end system
Mouth or path, user terminal access this interface or path, signal are demultiplexed by special equipment, descramble, decoding etc.
The process of series completes TV signal rating.The user for possessing mandate is set legally to use a certain item business, and the use of unauthorized
Family can not use this business, it is ensured that the user that only pay or will pay can just watch selected program, not
Paying customer can not then watch program.
Front end system realizes the encryption scrambling of signal, and the signal transmission that encryption is scrambled to user terminal, user terminal is utilized
CA storehouses and smart card TV reception.Wherein encrypting the signal of scrambling needs be packaged into before transmission to meet MPEG-2 marks
Accurate transport stream (i.e. TS) bag, MPEG-2 be the video that MPEG (Moving Picture Experts Group) is organized to set up and
Audio lossy compression method standard, single or multiple data are synthesized by one or more audios, video or other elementary streams
Stream, to be adapted to storage and transmit, and re-starts packing coding to it and forms code stream (i.e. ES).The various times are inserted in ES
The information such as mark, system control, are finally sent to channel coding and form transport stream (TS) bag with modulator, while TS bags are endowed
One different identifier (i.e. PID), for the data type that identification TS bags are carried.
Because TS bags quantity is a lot, in order to allow user terminal to be correctly found required code stream information, MPEG-2 is defined
Program information table (i.e. PSI), the effect of PSI is user terminal is set automatically and guide decoder to be decoded.PSI packets
Program Association Table (i.e. PAT), condition reception information table (i.e. CAT) and Program Map Table (i.e. PMT) are included, and network information table is (i.e.
NIT).Pat table includes the PMT_PID that all Program Map Tables in TS bags are each program, transport stream ID etc.；Wrapped in pmt table
Include elementary stream information i.e. video information, the audio-frequency information of each program；Mandate feelings of the CAT indicators to the user in specific CA storehouses
Condition, contains the CA_System_ID for identifying specific CA storehouses；NIT tables include that the physics of all of TS bags in the digital tv network is passed
Defeated net information, channel tuning parameter, frequency, symbol rate comprising program etc., these information allow user terminal according to
The selection at family changes channel, tuner parameters, correctly decodes out TS bags with little delay or no-delayly.Rating certain program
When from PAT obtain related-program PMT pid value, found out from TS bags according to this pid value corresponding with this pid value
PMT, according to corresponding PMT, obtains the pid value of the code stream for constituting this related-program, is leached according to this pid value and regarded accordingly
Frequently, the elementary stream such as audio and data, is restored to primary signal after decoding, carries out rating broadcasting.
Netcast device of the invention, the signal for encrypting scrambling derives from network, and its transmission means is different from wired electricity
Depending on encryption scrambled signals, it is necessary to the CA storehouses for being provided with netcast mechanism could be realized.When netcast is carried out, from network
The signal of encryption scrambling, the i.e. close flow data of network are obtained, this data is carried out demultiplexing process by control.Wherein it is demultiplexing as multiplexing
Inverse process, multiplexing be by video, audio compression packing after elementary stream and assistance data be multiplexed and to form TS bags, so demultiplexing
With being that the close flow data of network is decomposed into elementary stream and assistance data.TS bags are the bit stream formats based on Packet, each
Bag is 188 bytes, 192 bytes or 204 bytes, packet header and 184 data of byte of 188 bytes by 4 bytes
Composition, the TS bags of 192 bytes are that 4 verification datas of byte are increased on the basis of 188 bytes, 204 TS of byte
Stream is the CRC check data that 16 bytes are added after 188 bytes, and extended formatting is the same.Packet header includes a bag mark
Symbol PID, used as the unique mark of bag, the PID of pat table is 0x0000, and the PID of CAT is 0x0001.When user determines that rating is a certain
Program, the PID related to this program is obtained for the pat table and PID of 0x0000 are the CAT tables of 0x0001 by demultiplexing process,
The pid value of pmt table is known by pat table, the pmt table corresponding with this pid value is found out from TS bags according to this pid value, so that
Realize obtaining CAT tables and pmt table, i.e. CAT Conditional Access Table and Program Map Table from close flow data.
Second acquisition module 20, for obtain CAT Conditional Access Table interacted with smart card obtained by Entitlement Management Message network ground
Location and Program Map Table interacted with smart card obtained by the Entitlement Control Message network address；
Specifically, the index EMM_Pid for obtaining Entitlement Management Message (i.e. EMM) is also included in CAT tables, is passed through
The CA_System_ID and EMM_Pid contained in CAT tables, you can obtain the EMM information in CA storehouses where user.EMM Information applications
The program that can be seen in user management, including address, such as authorized user message, user or time period, the whether paid receipts of user
Depending on taking.Its management be user access be " what information ", which type of " authority " user is awarded.Also wrapped in pmt table
Include with the close many Entitlement Control Messages of CA (i.e. ECM)；For the encryption situation of program, pmt table contains CA_System_ID
And which kind of CA storehouses encryption ECM_PID, CA_System_ID are for program, ECM_PID is used to inform how user searches for ECM.
ECM information is used for program, including programme information source, time, the programme information such as classifying content and program price.Obtaining
After CAT tables and pmt table, CAT tables, pmt table are interacted with smart card respectively, by second acquisition module of descrambling 20 of smart card
The EMM network address of storage EMM network datas and the ECM network address of storage ECM network datas are obtained respectively.
Separation module 30, for accessing net according to the Entitlement Management Message network address and the Entitlement Control Message network address
Network, obtains Entitlement Management Message network data and Entitlement Control Message network data, and Entitlement Management Message network data is divided
From being Entitlement Management Message target data, Entitlement Control Message network data is separated into Entitlement Control Message target data；
In embodiment of the present invention, after the EMM network address and the ECM network address is obtained, according to the EMM networks
Address and the ECM network address access network, to obtain EMM network datas and ECM network datas.EMM network numbers are obtained from network
Real-time change during according to the information carried with ECM network datas, is stream data, and does not carry channel tuning parameter, the frequency of program
The auxiliary data informations such as rate, symbol rate, it is impossible to correctly decode TS bags.So that by this crossfire EMM network datas and ECM
Network data is mixed into close flow data after being packaged into TS bags, and separation module 30 is separated into EMM targets after carrying out demultiplexing filtering
Data and ECM target datas.
Descrambling module 40, for obtaining Entitlement Management Message target data, Entitlement Control Message target data and smart card
Control word obtained by interaction, and descrambling broadcasting is carried out to the close flow data of network based on control word.
The business key (i.e. SK) by individual subscriber key (i.e. PDK) encryption is contained in EMM target datas,
Contained in ECM by control word (i.e. CW) information after SK encryptions.PDK solidifies in smart card, and is deposited with encrypting formation
Storage, user provides password and is decrypted.EMM data and smart card are interacted, and the SK in EMM, root are decrypted by the PDK of smart card
CW i.e. can obtain to ECM decryption according to SK.Hereafter the control of descrambling module 40 CW descrambles to the close flow data of network, recovers original number
According to, this initial data is played out i.e. be capable of achieving it is user watched.
The netcast device of the present embodiment includes：First acquisition module 10, for obtaining net corresponding with actual program
The CAT Conditional Access Table and Program Map Table of the close flow data of network；Second acquisition module 20, for obtaining CAT Conditional Access Table and intelligence
Block interaction obtained by the Entitlement Management Message network address and Program Map Table interacted with smart card obtained by Entitlement Control Message
The network address；Separation module 30, for accessing net according to the Entitlement Management Message network address and the Entitlement Control Message network address
Network, obtains Entitlement Management Message network data and Entitlement Control Message network data, and Entitlement Management Message network data is divided
From being Entitlement Management Message target data, Entitlement Control Message network data is separated into Entitlement Control Message target data；Descrambling
Module 40, for obtaining the control obtained by the interaction of Entitlement Management Message target data, Entitlement Control Message target data and smart card
Word processed, and descrambling broadcasting is carried out to the close flow data of network based on control word.Technical scheme is by obtaining the close stream of network
CAT Conditional Access Table (CAT), the Program Map Table (PMT) of data respectively with smart card interaction obtained by Entitlement Control Message (EMM)
The network address, Entitlement Management Message (ECM) network address, and network is accessed according to the EMM network address and the ECM network address, from
And obtain EMM network datas and ECM network datas；Separate EMM network datas, ECM network datas and obtain EMM target datas, ECM
Target data；And then control the interaction of EMM target datas, ECM target datas and smart card to obtain control word, based on control word to net
The close flow data of network carries out descrambling broadcasting, realizes netcast.Netcast method of the invention, it is adaptable to which cable line signals are lost
Lose, network signal is normal or is fitted without cable lines, but be mounted with the situation of netting twine, interacted by CA storehouses and smart card
The authorization message of descrambling is preserved within a smart card, as long as user carries smart card, so that it may in different places such as hotel, sight spots not
With the program of watching authorization in equipment.
Further, reference picture 5, based on inventive network playing device first embodiment, play in inventive network and fill
Put in second embodiment, the separation module 30 includes：
First control unit 31, for controlling to draw Entitlement Management Message network data and Entitlement Control Message network data
It is divided into multiple transport stream packets, and this multiple transport stream packets is mixed into close flow data and is multiplexed with mixing flow data；
First acquisition unit 32, for obtaining Entitlement Management Message target data and mandate obtained by mixed flow data filtering
Control information target data.
In technical scheme, the EMM network datas and ECM obtained by the EMM network address and the ECM network address
Network data is stream data, it is necessary to control unit 31 carries out separating the signal that could further obtain needs.Specifically, please join
According to Fig. 9, stream data IP Datagram1 include IP (IP Header), TCP or UDP (TCP or UDP Header) and
Data (Data).Stream data is divided into multiple TS bags by control, and TS is surrounded by 188 bytes, 192 bytes or 204 bytes
Three kinds of forms, three kinds of forms all include 4 byte first codes (TS Header) and 184 byte datas (Data), wherein 192
The TS bags of byte are that 4 verification datas of byte are increased on the basis of 188 bytes, and 204 TS bags of byte are than 188 words
The many 16 byte verification datas of the TS bags of section.When data division is carried out, enter according to the form of 188 or 192 or 204 bytes
Row is divided into TS Packet1, TS Packet2 and TS Packet3, when TS Packet4 are divided into, data less than 188 or
Person 192 or 204 bytes, now need the data for increasing Adaptation to be filled, and form 188 bytes or 192
Or 204 complete TS bags of byte.After the completion of the division of TS bags, this multiple TS cladding is mixed into close flow data with (Mux)
In, acquiring unit 32 carries out demultiplexing and is filtrated to get with CA by the filter (Filter) in CA storehouses to mixed close flow data
EMM target datas and ECM target datas that storehouse needs.
Further, reference picture 6, based on inventive network playing device second embodiment, play in inventive network and fill
Put in 3rd embodiment, the descrambling module 40 includes：
Second control unit 41, for controlling Entitlement Management Message target data and smart card to interact, obtains business key；
Second acquisition unit 42, for according to business key, being decrypted to Entitlement Control Message target data, after obtaining decryption
Control word；
Descrambling unit 43, for according to control word, descrambling to the close flow data of network, obtains initial data, and to original
Beginning data are played out.
In the technical scheme of this programme, after EMM target datas and ECM target datas are filtered out from close flow data, control
EMM target datas and smart card interaction that unit processed 41 will be obtained, EMM is decrypted by the individual subscriber key PDK of smart card
SK in target data, CW is can obtain according to SK to the decryption of ECM target datas.According to the CW for decrypting, descrambler is controlled
(descrambler) the close flow data of network is descrambled, recovers initial data, it is real by being played out to this initial data
Existing user carries out rating by network.
Further, reference picture 7, based on inventive network playing device 3rd embodiment, play in inventive network and fill
Put in fourth embodiment, the netcast device includes：
Handover module 50, for when cable of cable TV line dropout is detected, switching condition access library to be network
Play mode, and obtain the close flow data of network corresponding with actual program.
In an embodiment of the present invention, user carries out TV reception by cable lines, there is the interference of some signals
In the case of cause cable line dropouts, when now detecting cable line dropouts, control CA storehouses are switched into network
Play mode, to realize the treatment to network data.Because that can be stored to the programme information played when cable lines are played,
During cable line dropouts, the TV programme phase that the programme information that can be stored according to this is played by Network Capture with cable lines
The close flow data of network answered.Wherein it will be appreciated that the close flow data of network carrys out automatic network, thus obtain network close flow data it
The preceding address for needing to know the close flow data of network by acquisition module 20, the close flow data of network is obtained with by this address.Specifically
Ground, by way of increasing descriptor in network information table NIT, obtains the network address of the close flow data of network, described in it
Identifier descriptor_tag is used to distinguish descriptor, when its value is 0X05, the net for obtaining encrypted audio/video data
Network address, i.e., the network address of close flow data.In the case of CA storehouses non-network play mode, i.e. cable lines signal are normal, lead to
The network address of this close flow data of descriptor acquiring network is crossed, and this network address can be multiple, when changing program so as to user
The close flow data of network that user needs can be obtained by changing the network address accordingly.In the case of cable line dropouts,
The close flow data of network can be obtained by this network address.Control is obtained by the operation such as deciphering and descrambling according to the close flow data of this network
Word processed continues to play to the TV programme before cable line dropouts.This operation is carried out automatically, and user is not aware that occurred
Cable line dropouts, do not influence user to watch.
Further, reference picture 8, based on inventive network playing device fourth embodiment, play in inventive network and fill
Put in the 5th embodiment, the netcast device includes：
Change module 60, for receive switching program instructions when, the network address of the close flow data of more switching network；
Performing module 70, for according to the network address after replacing, performing the CAT Conditional Access Table for obtaining the close flow data of network
And the step of Program Map Table.
Understandably, during rating is carried out there is the situation of switching program in user.Consolidated network address is same
Time can only play same program, realize the switching of program, then the network address of the inevitable first close flow data of more switching network.
When receiving the switching program instructions that user sends, change module 50 and the network address of the close flow data of network is changed；And
According to the network address after replacing, performing module 60 obtains the CAT tables and pmt table of the close flow data of network.Refer to Figure 10, root
The close flow data of network (TS Inject) is obtained according to the network address of the close flow data of network after replacing, by the close flow data of this network
After demultiplexing (i.e. Demux), the CAT tables and pmt table of the close flow data of this network are obtained；Control CAT tables, pmt table respectively and
Smart card Smartcard is interacted, the Entitlement Control Message network address and the Entitlement Management Message network address after being interacted
(ECM/EMM data NetWork Address)；Network is accessed according to the EMM network address and the ECM network address, EMM nets are obtained
The stream data of network data and ECM network datas；The stream data of EMM network datas and ECM network datas is packaged into multiple
TS bags, multiple TS bags are mixed into close flow data by being multiplexed (i.e. Mux), and by this mixed close flow data by demultiplexing
(demux) and filtering (Filter) be separated into EMM target datas and ECM target datas.By this EMM target data, ECM targets
Data and smart card are interacted, the control word (CW KEY) after being interacted, thereafter according to control word, descrambler
(descrambler) the close flow data of network is descrambled, it is real by being played out to this initial data to recover initial data
Now cut platform broadcasting.
The preferred embodiments of the present invention are the foregoing is only, the scope of the claims of the invention is not thereby limited, it is every at this
Under the design of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/it is used in indirectly
The technical field of his correlation is included in scope of patent protection of the invention.
Claims (10)
1. a kind of netcast method, it is characterised in that the netcast method is comprised the following steps：
Obtain the CAT Conditional Access Table and Program Map Table of the close flow data of network corresponding with actual program；
Obtain CAT Conditional Access Table interacted with smart card obtained by the Entitlement Management Message network address and Program Map Table and intelligence
Block the Entitlement Control Message network address obtained by interaction；
Network is accessed according to the Entitlement Management Message network address and the Entitlement Control Message network address, Entitlement Management Message net is obtained
Network data and Entitlement Control Message network data, and Entitlement Management Message network data is separated into Entitlement Management Message number of targets
According to Entitlement Control Message network data is separated into Entitlement Control Message target data；
The control word obtained by the interaction of Entitlement Management Message target data, Entitlement Control Message target data and smart card is obtained, and
Descrambling broadcasting is carried out to the close flow data of network based on control word.
2. netcast method as claimed in claim 1, it is characterised in that described and by Entitlement Management Message network data point
From being Entitlement Management Message target data, the step of Entitlement Control Message network data is separated into Entitlement Control Message target data
Including：
Entitlement Management Message network data and Entitlement Control Message network data are divided into multiple transport stream packets by control, and by this
Multiple transport stream packets are mixed into close flow data and are multiplexed with mixing flow data；
Obtain the Entitlement Management Message target data and Entitlement Control Message target data obtained by mixed flow data filtering.
3. netcast method as claimed in claim 1, it is characterised in that the acquisition Entitlement Management Message target data,
Control word obtained by Entitlement Control Message target data and smart card interaction, and the close flow data of network is solved based on control word
The step of disturbing broadcasting includes：
Control Entitlement Management Message target data and smart card interaction, obtain business key；
According to business key, Entitlement Control Message target data is decrypted, obtain the control word after decryption；
According to control word, the close flow data of network is descrambled, obtain initial data, and initial data is played out.
4. the netcast method as described in claim any one of 1-3, it is characterised in that the network of the acquisition actual program
Include before the step of CAT Conditional Access Table and Program Map Table of close flow data：
When cable of cable TV line dropout is detected, switching condition access library is netcast pattern, and obtains and work as
The corresponding close flow data of network of preceding program.
5. the netcast method as described in claim any one of 1-3, it is characterised in that described to take Entitlement Management Message target
Control word obtained by the interaction of data, Entitlement Control Message target data and smart card, and based on control word to the close flow data of network
Also include after the step of descrambling is played：
When switching program instructions are received, the network address of the close flow data of more switching network；
According to the network address after replacing, the step of the CAT Conditional Access Table and Program Map Table that obtain the close flow data of network is performed
Suddenly.
6. a kind of netcast device, it is characterised in that the netcast device includes：
First acquisition module, CAT Conditional Access Table and program map for obtaining the close flow data of network corresponding with actual program
Table；
Second acquisition module, for obtain CAT Conditional Access Table interacted with smart card obtained by the Entitlement Management Message network address and
Program Map Table interacted with smart card obtained by the Entitlement Control Message network address；
Separation module, for accessing network according to the Entitlement Management Message network address and the Entitlement Control Message network address, obtains
Entitlement Management Message network data and Entitlement Control Message network data, and Entitlement Management Message network data is separated into mandate
Management information target data, Entitlement Control Message network data is separated into Entitlement Control Message target data；
Descrambling module, for obtaining Entitlement Management Message target data, Entitlement Control Message target data and smart card interaction institute
The control word for obtaining, and descrambling broadcasting is carried out to the close flow data of network based on control word.
7. netcast device as claimed in claim 6, device is characterised by that the separation module includes：
First control unit is more for controlling to be divided into Entitlement Management Message network data and Entitlement Control Message network data
Individual transport stream packets, and this multiple transport stream packets is mixed into close flow data is multiplexed with mixing flow data；
First acquisition unit, for obtaining Entitlement Management Message target data and the authorization control letter obtained by mixed flow data filtering
Breath target data.
8. netcast device as claimed in claim 6, device is characterised by that the descrambling module includes：
Second control unit, for controlling Entitlement Management Message target data and smart card to interact, obtains business key；
Second acquisition unit, for according to business key, being decrypted to Entitlement Control Message target data, obtains the control after decryption
Word；
Descrambling unit, for according to control word, descrambling to the close flow data of network, obtains initial data, and to initial data
Play out.
9. the netcast device as described in claim any one of 6-8, it is characterised in that the netcast device is also wrapped
Include：
Handover module, for when cable of cable TV line dropout is detected, switching condition access library to be netcast mould
Formula, and obtain the close flow data of network corresponding with actual program.
10. the netcast device as described in claim any one of 6-8, device is characterised by that the netcast device is also wrapped
Include：
Change module, for receive switching program instructions when, the network address of the close flow data of more switching network；
Performing module, for according to the network address after replacing, performing the CAT Conditional Access Table and section for obtaining the close flow data of network
The step of mesh mapping table.
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