CN102957961A - Method and device for sharing encrypted digital television programs and digital television receiver - Google Patents
Method and device for sharing encrypted digital television programs and digital television receiver Download PDFInfo
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Abstract
The invention discloses a method and a device for sharing encrypted digital television programs and a digital television receiver. The method comprises the following steps: receiving an encrypted digital television program transport stream (TS) and demultiplexing; extracting program association table information, program mapping table information and conditional access table information; acquiring audio and video packet identifiers, an authorization control packet identifier and an authorization management information packet identifier; acquiring authorization control information and authorization management information from the TS; processing the authorization control information and the authorization management information by utilizing a descrambling module; acquiring encrypted program control words; acquiring decrypted audio and video data from the TS according to the audio and video packet identifiers and the encrypted program control words; and transmitting the decrypted audio and video data to a decoding player terminal to be decoded and played through a communication interface, so that the encrypted television program can be watched from the player terminal only with a decoding function, and the sharing of the encrypted digital television programs is realized .
Description
Technical field
The invention belongs to the digital television techniques field, specifically, relate to the processing to the enciphered digital television programme data, more particularly, relate to share method, device and the digital television receiver of enciphered digital TV programme.
Background technology
At present, if the user wants the watching encrypted digital television program, need to insert smart card in set-top box or all-in-one, utilize descrambling module to parse the Control Word of ciphered program, play on TV after by Control Word audio/video flow being deciphered again.Therefore, the TV programme that the playback terminal such as the mobile phone that the user can't be by not having smart card, PC is watched encryption has affected the health check-up of user's TV reception, has limited the popularization of TV programme.
Summary of the invention
The present invention is directed to user in the prior art can only the playback terminal with smart card watch digital television program and exist watch limited problem, the user provides a kind of method and apparatus of shared enciphered digital TV programme, so that can not arrange the playback terminal watching encrypted digital television program of smart card.
For achieving the above object, method provided by the invention adopts following technical proposals to be achieved:
A kind of method of shared enciphered digital TV programme, described method comprises the steps:
A1, reception enciphered digital TV programme TS stream and demultiplexing therefrom extract Program Association Table information, program map table information and CAT Conditional Access Table information;
A2, obtain audio frequency and video Packet Identifier and Entitlement Control Message Packet Identifier according to Program Association Table information and program map table information, according to CAT Conditional Access Table acquisition of information Entitlement Management Message Packet Identifier;
A3, from TS stream, obtain Entitlement Control Message and Entitlement Management Message according to Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier, utilize descrambling module to process Entitlement Control Message and Entitlement Management Message, obtain the ciphered program control word;
A4, according to audio frequency and video Packet Identifier and the ciphered program control word audio, video data after the Real-time Obtaining deciphering from TS stream;
A5, the audio, video data after will deciphering transfer to the decoding of decoding playback terminal by communication interface and play.
Aforesaid method, the enciphered digital TV programme TS that receives among described step a1 stream for the transmission of broadcasting and TV front end, the TS before the demodulation flows, and is not subjected to the restriction of local broadcast program with the enciphered digital TV programme that guarantees to share.
Aforesaid method can also be watched electronic program guides for realizing the user when the decoding playback terminal is shared ciphered program, also comprised the process of obtaining electronic program guide data from TS stream before described step a5; In step a5, first the audio, video data after electronic program guide data and the deciphering is complex as TS stream, and then the stream of the TS after compound is transferred to the decoding of decoding playback terminal and broadcast by communication interface.
For realizing aforementioned goal of the invention, device provided by the invention adopts following technical proposals to realize:
A kind of shared enciphered digital TV Festival destination device, described device comprises:
TS flows receiving element, is used for received television program TS stream;
Demultiplexing equipment, be connected with TS stream receiving element, be used for extracting Program Association Table information, program map table information and CAT Conditional Access Table information from TV programme TS stream, and obtain audio frequency and video Packet Identifier, Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier according to relevant information;
The descrambling unit, be connected with TS stream receiving element with demultiplexing equipment, be used for obtaining Entitlement Control Message and Entitlement Management Message according to Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier from TS stream, obtain ciphered program control word and output according to obtaining Entitlement Control Message and Entitlement Management Message;
The audio, video data acquiring unit is connected with descrambling unit, demultiplexing equipment and TS stream receiving element, for audio, video data and the output after deciphering from TS stream Real-time Obtaining according to the ciphered program control word;
Communication interface is connected with the audio, video data acquiring unit, is used for sending the audio, video data after deciphering;
The decoding playback terminal is connected the audio, video data behind the receiving and deciphering, and the broadcast of decoding with communication interface.
Aforesaid device, for guaranteeing that enciphered digital TV programme that the decoding playback terminal is shared is not subjected to the restriction of local broadcast program, described TS stream receiving element receive the transmission of broadcasting and TV front end, the TS stream before the demodulation, described demultiplexing equipment is to be independent of the local enciphered digital TV programme of playing with the equipment of demultiplexing equipment.
Aforesaid device can also be watched electronic program guides for realizing the user when the decoding playback terminal is shared ciphered program, described device also comprises:
The electronic program guide data acquiring unit is connected with described TS stream receiving element with described demultiplexing equipment, is used for obtaining the electronic program guides related data from TS stream;
The data recombiner unit is connected with electronic program guide data acquiring unit, described audio, video data acquiring unit and described communication interface, is used for the audio, video data after electronic program guide data and the deciphering is complex as TS stream and exports communication interface to.
The present invention also provides a kind of digital television receiver, comprises that local cipher digital television program Play System and shared enciphered digital television programme data obtain system, shares the enciphered digital television programme data and obtains system and comprise:
TS flows receiving element, be used for to receive the transmission of broadcasting and TV front end, the TV programme TS stream before the demodulation;
Demultiplexing equipment, be connected with TS stream receiving element, be used for extracting Program Association Table information, program map table information and CAT Conditional Access Table information from TV programme TS stream, and obtain audio frequency and video Packet Identifier, Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier according to relevant information;
The descrambling unit, be connected with TS stream receiving element with demultiplexing equipment, be used for obtaining Entitlement Control Message and Entitlement Management Message according to Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier from TS stream, obtain ciphered program control word and output according to obtaining Entitlement Control Message and Entitlement Management Message;
The audio, video data acquiring unit is connected with descrambling unit, demultiplexing equipment and TS stream receiving element, for audio, video data and the output after deciphering from TS stream Real-time Obtaining according to the ciphered program control word;
Communication interface is connected with the audio, video data acquiring unit, is used for sending the audio, video data after deciphering.
Aforesaid digital television receiver, described shared enciphered digital television programme data is obtained system and is also comprised:
The electronic program guide data acquiring unit is connected with described TS stream receiving element with described demultiplexing equipment, is used for obtaining the electronic program guides related data from TS stream;
The data recombiner unit is connected with electronic program guide data acquiring unit, described audio, video data acquiring unit and described communication interface, is used for the audio, video data after electronic program guide data and the deciphering is complex as TS stream and exports communication interface to.
Wherein, described digital television receiver is digital TV set-top box or digital TV integrated machine.
Compared with prior art, advantage of the present invention and good effect are: the descrambling module that utilization of the present invention has in the equipment of smart card is deciphered the enciphered digital TV programme, obtain the audio, video data after the deciphering, then the audio, video data after will deciphering is sent to the decoding playback terminal with decoding function, watching encrypted digital television program on the equipment of smart card not only can be had, can also watch at the playback terminal that only has decoding function, realize sharing of enciphered digital TV programme.
After reading the specific embodiment of the present invention by reference to the accompanying drawings, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the flow chart that the present invention shares an embodiment of method of enciphered digital TV programme;
Fig. 2 is the structured flowchart that the present invention shares an embodiment of enciphered digital TV Festival destination device;
Fig. 3 is the structured flowchart that the present invention shares enciphered digital TV Festival another embodiment of destination device;
Fig. 4 is the part-structure block diagram of an embodiment of digital television receiver of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail.
At first, brief description the present invention shares the realization thought of enciphered digital TV programme: in order not have the playback terminal watching encrypted digital television program of smart card, can decode by the descrambling module in the equipment with smart card the audio frequency and video TS stream after obtaining to decipher to ciphered program.TS stream after this deciphering becomes the publicity with decoding function playback terminal, the TV programme of the transparency, can directly be sent to the decoding playback terminal plays, so that not only can carrying out this locality in having the equipment of smart card, plays the scrambled TV service program, can also play at other decoding playback terminals that do not have smart card, thereby realize sharing of enciphered digital TV programme.
Please refer to Fig. 1, this Fig. 1 shows the flow chart that the present invention shares an embodiment of method of enciphered digital TV programme.This embodiment is in order to being example with the set-top box with smart card as decryption device, the digital television program that obtains and transmit after the deciphering, realizes that sharing of enciphered digital TV programme can adopt following step to realize:
Step 11: flow process begins.
Step 12: receive enciphered digital TV programme TS stream and demultiplexing, extract Program Association Table PAT information, Program Map Table PMT information and CAT Conditional Access Table CAT information.
When carrying out demultiplexing, can directly utilize in the set-top box demultiplexing equipment of playing the local cipher digital television program, like this, other playback terminal and set-top box are play the TV programme of identical frequency.In order to increase the selectance of the TV programme that playback terminal plays, make it not be subjected to the restriction of set-top box demultiplexing equipment, this embodiment preferably arranges two demultiplexing equipment in set-top box, one of them is as the demultiplexing of the local broadcast program of set-top box, and another is exclusively used in the demultiplexing of sharing TV programme.And, be exclusively used in that the demultiplexing equipment of sharing TV programme can directly transmit the broadcasting and TV front end, carry out demultiplexing without the TS stream of the tuning unit demodulates of set-top box, can save a tuner, can not increase the hardware cost of set-top box.
Step 13: according to PAT information and PMT acquisition of information audio frequency and video Packet Identifier (audio frequency and video PID) and Entitlement Control Message Packet Identifier (ECM PID), according to CAT Conditional Access Table acquisition of information Entitlement Management Message Packet Identifier (EMM PID).
Step 14: obtain Entitlement Control Message and Entitlement Management Message, utilize descrambling module to obtain the ciphered program control word.
After step 13 has been obtained ECM PID and EMM PID, from TS stream, obtain Entitlement Control Message and Entitlement Management Message according to separately PID.Then, utilize the descrambling module in the set-top box to process Entitlement Control Message and Entitlement Management Message, thereby obtain the ciphered program Control Word.
Step 15: according to the audio, video data after audio frequency and video PID and the deciphering of ciphered program Control Word Real-time Obtaining.
Step 16: the audio, video data after will deciphering transfers to the decoding playback terminal by communication interface.
Audio, video data after the deciphering can be by certain retransmission protocol, watch that according to the user request is sent to the decoding playback terminal from the communication interface of set-top box with the form of packet.
Step 17: the decoding playback terminal is to rear broadcast of audio, video data decoding after deciphering.
For the decoding playback terminal, because the audio, video data that set-top box sends is the data after the deciphering, also i.e. scrambled data not then only requires it to have the audio/video decoding ability, and the data that receive are carried out respectively can playing after audio decoder and the video decode.
This embodiment is by means of the simple unified communication interface of set-top box and decoding playback terminal, can utilize the descrambling module in the set-top box, when not affecting set-top box normal play ciphered program, obtain real-time and accurately with the audio frequency and video TS behind frequency or different frequent points program decryption stream and transfer to the decoding playback terminal, realize that the decoding playback terminal is to the broadcast of enciphered digital TV programme.And in this embodiment, the mode that the audio, video data after the deciphering can callback data offers the decoding playback terminal, and Data Transport Protocol is not construed as limiting, and can determine according to practical application, uses simple, flexibly.
In addition, check electronic program guide (EPG) at the decoding playback terminal for the convenience of the user, set-top box can also be obtained electronic program guide data according to PAT information, PMT information, Event Information Table (EIT) information, network information table (NIT) information and SDT Service Description Table (SDT) information etc. except with the transmission after the audio, video data deciphering from TS stream.Then, the audio, video data after electronic program guide data and the deciphering is complex as TS stream, and then the stream of the TS after compound is transferred to the decoding of decoding playback terminal and broadcast by communication interface.
Please refer to Fig. 2, this Fig. 2 shows the structured flowchart that the present invention shares an embodiment of enciphered digital TV Festival destination device.
As shown in Figure 2, for realizing sharing of enciphered digital TV programme, cell mesh, the annexation each other that the device of this embodiment is included and the function that realizes are as follows:
TS flows receiving element 211, is used for receiving the TV programme TS stream of encrypting.
Descrambling unit 213, be connected with TS stream receiving element 211 with demultiplexing equipment 212, be used for obtaining Entitlement Control Message and Entitlement Management Message according to Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier from TS stream, obtain ciphered program control word and output according to obtaining Entitlement Control Message and Entitlement Management Message.
Audio, video data acquiring unit 214 is connected with descrambling unit 213, demultiplexing equipment 212 and TS stream receiving element 211, for audio, video data and the output after deciphering from TS stream Real-time Obtaining according to the ciphered program control word.
The decoding playback terminal 20 that is consisted of by the communication interface 216 that connects successively, TS stream decoding unit 217 and program broadcast unit 218, wherein, communication interface 216 is connected with communication interface 215, audio, video data behind the receiving and deciphering, then through 217 decodings of TS stream decoding unit, play by program broadcast unit 218 after the decoding.
Wherein, TS stream receiving element 211, demultiplexing equipment 212, descrambling unit 213, audio, video data acquiring unit 214 and communication interface 215 are arranged on the structure in the digital television receivers such as set-top box with smart card, can be that digital television receiver is realized the used structure of local program encrypting broadcast, also can be the independent structure that arranges.Preferably, it is to be independent of the digital television receiver local program encrypting to play used structure that TS stream receiving element 211 is conciliate multiplexing equipments 21, and TS stream receiving element 211 receive the transmission of broadcasting and TV front ends, the TS stream before the demodulation; And descrambling unit 213 is the structures in the set-top box, and communication interface 215 is communication interfaces that set-top box carries.
The device of this structure will realize that the enciphered digital TV programme is not arranging smart card but has the broadcast of the decoding playback terminal 20 of TS stream decoding function according to the described flow process of Fig. 1 under the cooperation of relevant software programs.
Please refer to Fig. 3, this Figure 3 shows that the present invention shares the structured flowchart of enciphered digital TV Festival another embodiment of destination device.
As shown in Figure 3, similar with Fig. 2 embodiment, this embodiment shares enciphered digital TV Festival destination device and also includes TS stream receiving element 311, demultiplexing equipment 312, descrambling unit 313, audio, video data acquiring unit 314 and communication interface 317, and function and Fig. 2 embodiment that decoding playback terminal 30. these structures that are made of communication interface 316, TS stream decoding unit 317 and program broadcast unit 318 realize are similar, do not repeat at this.
And different from Fig. 2 embodiment be that the device of this embodiment also includes the electronic program guide data acquiring unit 315 that is connected with TS stream receiving element 311 with demultiplexing equipment 312, is used for from TS stream obtaining the electronic program guides related data; And
By electronic program guide data acquiring unit 315 and data recombiner unit 316 are set, electronic program guide data can be transferred in the lump decoding playback terminal 30, the user can check electronic program guides at decoding playback terminal 30, has satisfied the watch demand of user to the existing rich content of TV programme.
Please refer to Fig. 4, this Fig. 4 shows the part-structure block diagram of an embodiment of digital television receiver of the present invention.
This embodiment is provided with smart card and realizes the enciphered digital TV programme Play System 41 that local program encrypting is play take digital TV set-top box as example in this set-top box, also have shared enciphered digital television programme data and obtain system 42.
Wherein, local program encrypting Play System 41 includes tuner 411, demultiplexing equipment 412, descrambling unit 413, audio, video data acquiring unit 414 and program broadcast unit 415, each unit co-ordination realizes the broadcast to the local cipher digital television program.
Shared enciphered digital television programme data is obtained system 42 and specifically comprised: TS stream receiving element 421, demultiplexing equipment 422, descrambling unit 423, audio, video data acquiring unit 424 and communication interface 425, the concrete annexation between each structure and the function that realizes can be described with reference to figure 2 embodiment.
And, in this embodiment, share the enciphered digital television programme data and obtain the TS stream that the TS stream receiving element 421 direct reception broadcasting and TV front ends in the system 42 come by cable transmission; Demultiplexing equipment 412 in its demultiplexing equipment 422 and the enciphered digital TV programme Play System 41 is the separate demultiplexing equipment of two covers, and descrambling unit 413 and descrambling unit 423 are same structure, all adopt the descrambling unit in the set-top box to realize.Thereby utilize the cover demultiplexing equipment of two in the set-top box and a smart card, not only realize the broadcast of set-top box local cipher digital television program, digital television program data communication device after the deciphering can also be crossed communication interface 425 and transfer in other playback terminals that do not have smart card and play, realize and the sharing of the identical or different enciphered digital television programme data of the local ciphered program of playing.
Above embodiment is only in order to illustrating technical scheme of the present invention, but not limits it; Although with reference to previous embodiment the present invention is had been described in detail, for the person of ordinary skill of the art, still can make amendment to the technical scheme that previous embodiment is put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of the present invention's technical scheme required for protection.
Claims (10)
1. the method for a shared enciphered digital TV programme is characterized in that, described method comprises the steps:
A1, reception enciphered digital TV programme TS stream and demultiplexing therefrom extract Program Association Table information, program map table information and CAT Conditional Access Table information;
A2, obtain audio frequency and video Packet Identifier and Entitlement Control Message Packet Identifier according to Program Association Table information and program map table information, according to CAT Conditional Access Table acquisition of information Entitlement Management Message Packet Identifier;
A3, from TS stream, obtain Entitlement Control Message and Entitlement Management Message according to Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier, utilize descrambling module to process Entitlement Control Message and Entitlement Management Message, obtain the ciphered program control word;
A4, according to audio frequency and video Packet Identifier and the ciphered program control word audio, video data after the Real-time Obtaining deciphering from TS stream;
A5, the audio, video data after will deciphering transfer to the decoding of decoding playback terminal by communication interface and play.
2. method according to claim 1 is characterized in that, the enciphered digital TV programme TS that receives among described step a1 stream for the transmission of broadcasting and TV front end, the TS before the demodulation flows.
3. method according to claim 1 and 2 is characterized in that, also comprises the process of obtaining electronic program guide data from TS stream before described step a5; In step a5, first the audio, video data after electronic program guide data and the deciphering is complex as TS stream, and then the stream of the TS after compound is transferred to the decoding of decoding playback terminal and broadcast by communication interface.
4. shared enciphered digital TV Festival destination device is characterized in that described device comprises:
TS flows receiving element, is used for received television program TS stream;
Demultiplexing equipment, be connected with TS stream receiving element, be used for extracting Program Association Table information, program map table information and CAT Conditional Access Table information from TV programme TS stream, and obtain audio frequency and video Packet Identifier, Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier according to relevant information;
The descrambling unit, be connected with TS stream receiving element with demultiplexing equipment, be used for obtaining Entitlement Control Message and Entitlement Management Message according to Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier from TS stream, obtain ciphered program control word and output according to obtaining Entitlement Control Message and Entitlement Management Message;
The audio, video data acquiring unit is connected with descrambling unit, demultiplexing equipment and TS stream receiving element, for audio, video data and the output after deciphering from TS stream Real-time Obtaining according to the ciphered program control word;
Communication interface is connected with the audio, video data acquiring unit, is used for sending the audio, video data after deciphering;
The decoding playback terminal is connected the audio, video data behind the receiving and deciphering, and the broadcast of decoding with communication interface.
5. device according to claim 4 is characterized in that, described TS stream receiving element receive the transmission of broadcasting and TV front end, the TS stream before the demodulation, described demultiplexing equipment is to be independent of the local enciphered digital TV programme of playing with the equipment of demultiplexing equipment.
6. according to claim 4 or 5 described devices, it is characterized in that described device also comprises:
The electronic program guide data acquiring unit is connected with described TS stream receiving element with described demultiplexing equipment, is used for obtaining the electronic program guides related data from TS stream;
The data recombiner unit is connected with electronic program guide data acquiring unit, described audio, video data acquiring unit and described communication interface, is used for the audio, video data after electronic program guide data and the deciphering is complex as TS stream and exports communication interface to.
7. digital television receiver comprises that local cipher digital television program Play System and shared enciphered digital television programme data obtain system, it is characterized in that, shares the enciphered digital television programme data and obtains system and comprise:
TS flows receiving element, be used for to receive the transmission of broadcasting and TV front end, the TV programme TS stream before the demodulation;
Demultiplexing equipment, be connected with TS stream receiving element, be used for extracting Program Association Table information, program map table information and CAT Conditional Access Table information from TV programme TS stream, and obtain audio frequency and video Packet Identifier, Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier according to relevant information;
The descrambling unit, be connected with TS stream receiving element with demultiplexing equipment, be used for obtaining Entitlement Control Message and Entitlement Management Message according to Entitlement Control Message Packet Identifier and Entitlement Management Message Packet Identifier from TS stream, obtain ciphered program control word and output according to obtaining Entitlement Control Message and Entitlement Management Message;
The audio, video data acquiring unit is connected with descrambling unit, demultiplexing equipment and TS stream receiving element, for audio, video data and the output after deciphering from TS stream Real-time Obtaining according to the ciphered program control word;
Communication interface is connected with the audio, video data acquiring unit, is used for sending the audio, video data after deciphering.
8. digital television receiver according to claim 7 is characterized in that, described shared enciphered digital television programme data is obtained system and also comprised:
The electronic program guide data acquiring unit is connected with described TS stream receiving element with described demultiplexing equipment, is used for obtaining the electronic program guides related data from TS stream;
The data recombiner unit is connected with electronic program guide data acquiring unit, described audio, video data acquiring unit and described communication interface, is used for the audio, video data after electronic program guide data and the deciphering is complex as TS stream and exports communication interface to.
9. according to claim 8 or 9 described digital television receivers, it is characterized in that described digital television receiver is digital TV set-top box.
10. according to claim 8 or 9 described digital television receivers, it is characterized in that described digital television receiver is digital TV integrated machine.
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