CN108289240A - Method, terminal and the computer-readable medium of DTV fast channel switching - Google Patents
Method, terminal and the computer-readable medium of DTV fast channel switching Download PDFInfo
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- CN108289240A CN108289240A CN201810089098.0A CN201810089098A CN108289240A CN 108289240 A CN108289240 A CN 108289240A CN 201810089098 A CN201810089098 A CN 201810089098A CN 108289240 A CN108289240 A CN 108289240A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000015654 memory Effects 0.000 claims description 19
- 238000013475 authorization Methods 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 2
- 238000013507 mapping Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 241000233805 Phoenix Species 0.000 description 3
- 241001269238 Data Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—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
- H04N21/43—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
- H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
- H04N21/4353—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream involving decryption of additional data
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4383—Accessing a communication channel
- H04N21/4384—Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
-
- 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)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The embodiment of the invention discloses a kind of method, terminal and the computer-readable medium of DTV fast channel switching, wherein this method includes：When receiving zapping instruction, the audio and video packet that the audio and video packet mark of audio and video filter is switched to target program identifies, and audio, video data corresponding with the audio and video packet of target program mark is obtained by audio and video filter；Corresponding control word is obtained according to the Program Map Table of the target program cached in advance, descrambler is arranged according to control word；By descrambler descrambles audio, video data, the audio, video data after descrambling is decoded, and the audio, video data after broadcast decoder.Method, terminal and the computer-readable medium of DTV fast channel switching provided in an embodiment of the present invention, the directly audio and video packet mark of switching audio and video filter, and descrambler directly descrambles the audio, video data that audio and video filter filters out, for the user terminal for not supporting that multichannel descrambles, realize fast channel switching, cost is reduced, the user experience is improved.
Description
Technical field
The present embodiments relate to digital television techniques more particularly to a kind of method, the terminals of DTV fast channel switching
And computer-readable medium.
Background technology
Digital television system is coordinated by service front-end, user terminal and smart card to realize the broadcasting of program at present, wherein number
Word video broadcasting (Digital Video Broadcasting, DVB) standard is one of digital television standard.DVB standard system
Include condition receiving system (Conditional Access System, CAS), the task of the system is to ensure DVB business only
It is authorized to the user received to be received.
In cas system the CA modules of service front-end by control word caused by random code generator (Control Word,
CW) programme signal is scrambled；To CW be encrypted generate Entitlement Control Message (Entitlement Control Message,
ECM)；ECM data packets together with scrambled code stream are transmitted to user terminal by multiplexer, wherein the packet of ECM data packets identifies
(Packet ID, PID) is stored in Program Map Table (Program Map Table, PMT).
The pmt table of the CA modules parsing target program of user terminal obtains ECM PID in cas system, and according to ECM PID mistakes
Filter out ECM data packets；When the smart card used in confirmation has been authorized to, is decrypted, obtained using the ECM key pairs ECM of smart card
To CW；Scrambled code stream is descrambled with the CW decrypted, the normal decoding to carry out target program plays.
The specific process flow that usual user terminal carries out zapping descrambling is as follows：
1, for set-top box after receiving zapping instruction, control CA modules stop receiving the pmt table of actual program；
2, the ECM filter resources and descrambler resource of CA modules release actual program；
3, user terminal stops the audio and video playing of actual program, and unlocking noise audio filters resource；
4, user terminal receives the pmt table of target program, parses the audio and video PID of target program, applies for filter resources, and
Filter is set according to the audio and video PID of target program, to receive the audio, video data of target program；
5, the pmt table of target program is sent to CA modules by user terminal, to obtain ECM PID；
6, CA modules application ECM filter resources, and ECM PID are set, to filter ECM data；
7, CA modules application descrambler resource, and it is associated with the PID of audio and video；
8, CA modules obtain the CW obtained through smart card parsing ECM data, and descrambler is arranged, and realize target program solution
It disturbs.
The process step is comparatively laborious, and all needs to repeat in each zapping, causes zapping speed to be improved.Mesh
Before, the method for common fast channel switching descrambling is, to CA producers purchase multichannel descrambling data library, to make user terminal realize multichannel solution
It disturbs, to improve the speed of zapping descrambling, such as parses the CW of two programs up and down in the rendition list simultaneously, realize while solving
Disturb three road programs.This method shortcoming is, purchase multichannel descrambling data library compared with purchase single channel descrambling data library cost compared with
Height, and and not all user terminal all support multichannel descramble.
Invention content
It can in view of this, an embodiment of the present invention provides a kind of method, terminal and the computers of DTV fast channel switching
Medium is read, for the user terminal of single channel descrambling, fast channel switching is realized, reduces cost, the user experience is improved.
In a first aspect, an embodiment of the present invention provides a kind of methods of DTV fast channel switching, including：
When receiving zapping instruction, the audio and video packet mark of audio and video filter is switched to the audio and video of target program
Packet mark obtains audio, video data corresponding with the audio and video packet of target program mark by the audio and video filter；
Corresponding control word is obtained according to the Program Map Table of the target program cached in advance, according to the control word
Descrambler is set；
The audio, video data obtained by audio and video filter described in the descrambler descrambles, by the audio and video number after descrambling
According to being decoded, and the audio, video data after broadcast decoder.
Second aspect, an embodiment of the present invention provides a kind of terminals, including：
One or more processors；
Memory, for storing one or more programs；
When one or more of programs are executed by one or more of processors so that one or more of processing
The method that device realizes the DTV fast channel switching as described in any embodiment of the present invention.
The third aspect, an embodiment of the present invention provides a kind of computer readable storage mediums, are stored thereon with computer journey
Sequence, the method that the DTV fast channel switching as described in any embodiment of the present invention is realized when which is executed by processor.
Method, terminal and the computer-readable medium of a kind of DTV fast channel switching provided in an embodiment of the present invention lead to
The audio and video packet mark for crossing directly switching audio and video filter, without discharging and applying again audio and video filter resources, to
Save the time of audio and video filter resources release and application；By being associated with descrambler and audio and video filter, make descrambler
The audio, video data that audio and video filter filters out can directly be descrambled, and without discharging and applying descrambler resource, without
Again it is associated with the audio and video PID of descrambler and target program, to save the time of descrambler resource release and application, and
The time for saving association descrambler and the audio and video PID of target program again realizes fast for the user terminal of single channel descrambling
Quick change platform, reduces cost, and the user experience is improved.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to do one simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of method flow diagram for DTV fast channel switching that the embodiment of the present invention one provides；
Fig. 2 be a kind of DTV fast channel switching that the embodiment of the present invention one provides method according to the mesh that caches in advance
The Program Map Table of mark program obtains the preferred embodiment flow chart of corresponding control word step；
Fig. 3 is a kind of structural schematic diagram of terminal provided by Embodiment 2 of the present invention.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, hereinafter with reference to attached in the embodiment of the present invention
Figure, technical scheme of the present invention is clearly and completely described by embodiment, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Embodiment one
Fig. 1 is a kind of method flow diagram for DTV fast channel switching that the embodiment of the present invention one provides, and the present embodiment can
Suitable for single channel descrambling user terminal fast channel switching the case where, this method can be realized by terminal, such as can be DTV
Set-top box, or can be the television set of built-in digital television set-top box, it can also be to receive to block by using computer, realize
It watches digital television program or constitutes the terminal etc. of interaction, can specifically be implemented by software in terminal and/or hardware.Referring to
The method of Fig. 1, the DTV fast channel switching include the following steps：
S110, when receiving zapping instruction, the audio and video packet of audio and video filter mark is switched to target program
Audio and video packet identifies, and audio and video number corresponding with the audio and video packet of target program mark is obtained by audio and video filter
According to.
Wherein, zapping instruction can be the zapping instruction sent out by being remotely controlled end；Wherein, remote control end can be with physics by
The remote controler of key, touch controlled key and/or virtual key can also be the intelligence being connected with fast channel switching terminal by application software
Energy terminal (such as mobile phone, tablet computer etc.), i.e., zapping instruction can be infrared signal, can also be data information；Work as remote control
When end is intelligent terminal, zapping instruction can be generated by the touch action for clicking, sliding etc. to Touch Screen, can also passed through
Zapping instruction is generated to the pressing of physical button.
Wherein, audio and video filter can be the audio and video filter applied automatically after starting up of terminal or advance Shen
Audio and video filter that please be good, which can not have to release after application, and directly carry out reality by switching audio and video PID
The switching of existing received audio, video data.
Illustratively, if terminal current playing program is the program in 1, center, the audio and video filter of terminal is currently set
The audio and video PID set is the program audio and video PID in 1, center.Terminal needs to switch to target broadcasting after receiving zapping instruction
Program, it is assumed that target plays the program that program is Phoenix Satellite TV, at this point, terminal is not necessarily to discharge current audio and video filter, it
Apply for new audio and video filter again again afterwards, and sets the audio and video PID of new audio and video filter to Phoenix Satellite TV
Program audio and video PID, and the sound of the audio and video PID of the original audio and video filter programs for being switched to Phoenix Satellite TV need to only be regarded
Frequency PID.By directly switching the audio and video PID of audio and video filter, without discharging and applying again audio and video filter
Resource improves zapping speed to save the time of audio and video filter resources release and application.
Optionally, before receiving zapping instruction, further include：Backstage is collected and any buffered program mapping table；To program map
Table is parsed, and audio and video packet mark is obtained.
Wherein, in the case of terminal hardware conditions permit, for example, terminal include multiple tuners when, can not influence to work as
While preceding program normal play, the frequency lockings of other programs is carried out from the background and is collected.By collecting from the background and caching other programs
PMT, and the PMT of other programs is parsed, when can obtain the audio and video PID of other programs, and zapping can be saved
The time for receiving the PMT of target program, improve zapping speed.
Further, simultaneously any buffered program mapping table is collected from the background, may include：It collects and caches all programs of current frequency point
Program Map Table；When successfully caching the Program Map Table of all programs of current frequency point, next frequency point is switched to, by next frequency
Point is used as current frequency point, until successfully having cached the Program Map Table of all frequency points.
Wherein, one or more sets program datas can be transmitted in each frequency point, can specifically depends on program transmission bandwidth
The clarity of standard and program data, bandwidth is wider, and the clarity of program data is lower, then corresponding each frequency point can transmit
Program tricks is more.Illustratively, when using 8M bandwidth criterias, each frequency point can transmit 8 sets of SD program datas or 4 sets
High-definition program data.
Wherein, when collecting with all program PMT are cached, the PMT of all programs under current frequency point can be collected, is then existed
After success caches the PMT of current all programs of frequency point, judge whether that there is also uncached frequency points, and if it exists, can then switch
To next frequency point, the PMT of all programs of next frequency point is collected and caches, it, then can be with until successfully cached the PMT of all frequency points
Stopping is collected.
Wherein it is possible to cache the PMT collected to the cache path of acquiescence, inlet porting can also be reserved, user is made
Can cache path be set by inlet porting.
Optionally, when terminal detects program PMT update, program PMT that can be after automatic buffer update.
Further, Program Map Table is parsed, obtains audio and video packet mark, may include：It is often collecting to one
After the Program Map Table of a program, the Program Map Table for the program collected is parsed, obtains collected one
The audio and video packet of program identifies；Alternatively, after having collected the Program Map Table of all programs of all frequency points, by collecting, sequence is right
The Program Map Table of all programs is parsed, and the audio and video packet mark of all programs is obtained.
It is collected by synchronizing and parses PMT or parse PMT after the completion of collecting, the corresponding sound of each program can be obtained and regarded
Frequency PID, when terminal receives zapping instruction, sound is arranged in the audio and video PID for the target program that can be directly obtained using parsing
Audio filters save the time that parsing PMT obtains the audio and video PID of target program, to improve zapping speed.
S120, corresponding control word is obtained according to the Program Map Table of the target program cached in advance, is set according to control word
Set descrambler.
Specifically, target program ECM PID can be obtained by the PMT for parsing target program；It can be set according to ECMPID
ECM filters are set, to the ECM of Filtration Goal program；The CW of target program can be obtained by parsing ECM；According to target section
Descrambler is arranged in purpose CW, can pass through descrambler descrambles target program data.
Optionally, Fig. 2 is provided in a kind of method of DTV fast channel switching according to the target program cached in advance
Program Map Table obtains the preferred embodiment flow chart of corresponding control word step.Referring to Fig. 2, according to the target cached in advance
The Program Map Table of program obtains corresponding control word, including：
S121, the Program Map Table of the target program cached in advance is sent to Conditional Access Module, passes through condition reception
Module parses Program Map Table, obtains the Entitlement Control Message packet mark of target program；
S122, the Entitlement Control Message packet that target program is obtained by Entitlement Control Message filter identify corresponding mandate
Control information；
S123, corresponding control word is obtained by smart card parsing Entitlement Control Message.
Optionally, the Entitlement Control Message packet for target program being obtained by Entitlement Control Message filter identifies corresponding award
Power control information, including：The Entitlement Control Message packet mark of Entitlement Control Message filter is switched to the mandate of target program
Packet banner is controlled, the Entitlement Control Message of target program is obtained by Entitlement Control Message filter.
Wherein, ECM filters can be that the ECM filters applied automatically after starting up of terminal or pre- first to file are good
ECM filters, which can not have to release after application, and directly realize received ECM by switching ECM PID
The switching of data improves zapping speed to save the time of ECM filter resources release and application.
Optionally, Entitlement Control Message is parsed by smart card and obtains corresponding control word, including：By awarding for target program
Power control information is sent to smart card, passes through the Entitlement Control Message of the Entitlement Control Message key pair target program in smart card
It is decrypted, obtains the control word of target program.
Optionally, it before the Program Map Table for the target program that will be cached in advance is sent to Conditional Access Module, also wraps
It includes：Stop receiving the Program Map Table of actual program according to zapping instruction control condition receiving module.
S130, the audio, video data obtained by descrambler descrambles audio and video filter, by the audio, video data after descrambling
It is decoded, and the audio, video data after broadcast decoder.
Wherein, descrambler can be the descrambler applied automatically after starting up of terminal or the good descrambler of pre- first to file,
The descrambler can be directly linked audio and video filter after application, without being associated with audio and video PID.By by descrambler and sound
Audio filters are directly linked, and terminal can be not necessarily to release and apply for descrambler resource again when receiving zapping instruction, and
And without the audio and video PID for being associated with new descrambler and target program, you can pass through original descrambler descrambles audio and video mistake
The audio, video data for the target program that filter obtains also saves to save the time of descrambler resource release and application
It is associated with the time of the descrambler and target audio and video PID newly applied, to improve zapping speed.
The method of DTV fast channel switching provided in an embodiment of the present invention, by the sound for directly switching audio and video filter
Video bag identifies, without discharging and applying again audio and video filter resources, to save the release of audio and video filter resources
With the time of application；By being associated with descrambler and audio and video filter, descrambler is allow directly to descramble audio and video filter mistake
The audio, video data filtered out, and without discharging and applying descrambler resource, without association descrambler again and target program
Audio and video PID to save the time of descrambler resource release and application, and is saved and is associated with descrambler and target again
The time of the audio and video PID of program realizes fast channel switching, reduces cost, improve use for the user terminal of single channel descrambling
It experiences at family.
Embodiment two
A kind of terminal is present embodiments provided, DTV fast channel switching is can be used for.Fig. 3 is that the embodiment of the present invention two carries
A kind of structural schematic diagram of the terminal supplied.Referring to Fig. 3, which includes：
One or more processors 310；
Memory 320, for storing one or more programs；
When one or more of programs are executed by one or more of processors 310 so that one or more of
The method that processor 310 realizes the DTV fast channel switching proposed such as embodiment one.
In Fig. 3 by taking a processor 310 as an example；Processor 310 and memory 320 can be connected by bus or other modes
It connects, in Fig. 3 for being connected by bus.
Memory 320 is used as a kind of computer readable storage medium, can be used for storing software program, computer can perform journey
Sequence and module, such as the corresponding program instruction/module of the method for the DTV fast channel switching in the embodiment of the present invention.Processor
310 are stored in software program, instruction and module in memory 320 by operation, and the various functions to execute terminal are answered
With and data processing, that is, the method for realizing above-mentioned DTV fast channel switching.
Memory 320 can include mainly storing program area and storage data field, wherein storing program area can store operation system
Application program needed for system, at least one function；Storage data field can be stored uses created data etc. according to terminal.This
Outside, memory 320 may include high-speed random access memory, can also include nonvolatile memory, for example, at least one
Disk memory, flush memory device or other non-volatile solid state memory parts.In some instances, memory 320 can be into one
Step includes the memory remotely located relative to processor 310, these remote memories can pass through network connection to terminal.On
The example for stating network includes but not limited to internet, intranet, LAN, mobile radio communication and combinations thereof.
In addition, according to the different form of terminal, in addition to processor 310 and memory 320, terminal can also include other moulds
Block or structure, for example, terminal needs to receive extraneous zapping instruction, then further include zapping instruction receiving module；For another example, terminal needs
Information is controlled by smart card decryption and authorization, then further includes smart card, control word is obtained for decryption and authorization control information, with solution
Disturb target program.
The method for the DTV fast channel switching that the terminal that the present embodiment proposes is proposed with embodiment one belongs to same invention
Design, the technical detail of detailed description not can be found in embodiment one in the present embodiment, and the present embodiment has with embodiment one
There is identical advantageous effect.
Embodiment three
The present embodiment provides a kind of computer readable storage mediums, are stored thereon with computer program, which is handled
The method that the DTV fast channel switching proposed such as embodiment one is realized when device executes.
The side for the DTV fast channel switching that the computer readable storage medium that the present embodiment proposes is proposed with embodiment one
It is owned by France in same inventive concept, the technical detail of detailed description not can be found in embodiment one, and this implementation in the present embodiment
Example and one advantageous effect having the same of embodiment.
By the description above with respect to embodiment, it is apparent to those skilled in the art that, the present invention
It can be realized by software and required common hardware, naturally it is also possible to which by hardware realization, but the former is more in many cases
Good embodiment.Based on this understanding, technical scheme of the present invention substantially in other words contributes to the prior art
Part can be expressed in the form of software products, which can be stored in computer readable storage medium
In, such as the floppy disk of computer, read-only memory (Read-Only Memory, ROM), random access memory (Random
Access Memory, RAM), flash memory (FLASH), hard disk or CD etc., including some instructions are with so that a computer is set
Standby (can be personal computer, server or the network equipment etc.) executes the method described in each embodiment of the present invention.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
May include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of method of DTV fast channel switching is suitable for the user terminal of single channel descrambling, which is characterized in that including：
When receiving zapping instruction, the audio and video packet mark of audio and video filter is switched to the audio and video packet mark of target program
Know, audio, video data corresponding with the audio and video packet of target program mark is obtained by the audio and video filter；
Corresponding control word is obtained according to the Program Map Table of the target program cached in advance, is arranged according to the control word
Descrambler；
By described in the descrambler descrambles audio and video filter obtain audio, video data, by the audio, video data after descrambling into
Row decoding, and the audio, video data after broadcast decoder.
2. according to the method described in claim 1, it is characterized in that, before receiving zapping instruction, further include：
Backstage is collected and any buffered program mapping table；
The Program Map Table is parsed, audio and video packet mark is obtained.
3. according to the method described in claim 2, it is characterized in that, the backstage is collected and any buffered program mapping table, including：
Collect and cache the Program Map Table of all programs of current frequency point；
When successfully caching the Program Map Table of all programs of current frequency point, next frequency point is switched to, next frequency point is made
For current frequency point, the Program Map Table up to successfully having cached all frequency points.
4. according to the method described in claim 3, it is characterized in that, described parse the Program Map Table, sound is obtained
Video bag identifies, including：
After often collecting the Program Map Table to a program, the Program Map Table for the program collected is parsed,
Obtain the audio and video packet mark of a collected program；
Alternatively, after having collected the Program Map Table of all programs of all frequency points, by the program collected sequentially to all programs
Mapping table is parsed, and the audio and video packet mark of all programs is obtained.
5. according to the method described in claim 1, it is characterized in that, the program map for the target program that the basis caches in advance
Table obtains corresponding control word, including：
The Program Map Table of the target program cached in advance is sent to Conditional Access Module, passes through the Conditional Access Module solution
The Program Map Table is analysed, the Entitlement Control Message packet mark of target program is obtained；
The Entitlement Control Message packet that the target program is obtained by Entitlement Control Message filter identifies corresponding authorization control
Information；
The Entitlement Control Message, which is parsed, by smart card obtains corresponding control word.
6. according to the method described in claim 5, it is characterized in that, described obtain the mesh by Entitlement Control Message filter
The Entitlement Control Message packet for marking program identifies corresponding Entitlement Control Message, including：
The Entitlement Control Message packet mark of Entitlement Control Message filter is switched to the Entitlement Control Message packet mark of target program
Know, the Entitlement Control Message of target program is obtained by the Entitlement Control Message filter.
7. according to the method described in claim 5, it is characterized in that, described parse the Entitlement Control Message by smart card and obtain
To corresponding control word, including：
The Entitlement Control Message of the target program is sent to smart card, it is close by the Entitlement Control Message in the smart card
The Entitlement Control Message of the target program is decrypted in key, obtains the control word of target program.
8. according to the method described in claim 5, it is characterized in that, in the program map by the target program cached in advance
Table is sent to before Conditional Access Module, further includes：
The Program Map Table that the Conditional Access Module stops receiving actual program is controlled according to the zapping instruction.
9. a kind of terminal, which is characterized in that the terminal includes：
One or more processors；
Memory, for storing one or more programs；
When one or more of programs are executed by one or more of processors so that one or more of processors are real
Now such as the method for DTV fast channel switching according to any one of claims 1-8.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
The method such as DTV fast channel switching according to any one of claims 1-8 is realized when execution.
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