CN108289240B - Method, terminal and computer readable medium for quickly changing channels of digital television - Google Patents
Method, terminal and computer readable medium for quickly changing channels of digital television Download PDFInfo
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- CN108289240B CN108289240B CN201810089098.0A CN201810089098A CN108289240B CN 108289240 B CN108289240 B CN 108289240B CN 201810089098 A CN201810089098 A CN 201810089098A CN 108289240 B CN108289240 B CN 108289240B
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- 238000013475 authorization Methods 0.000 claims description 32
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- 206010036618 Premenstrual syndrome Diseases 0.000 description 3
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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]
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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
- H04N21/435—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
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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
- H04N21/43—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
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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
- H04N21/4627—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 method, a terminal and a computer readable medium for quickly changing channels of a digital television, wherein the method comprises the following steps: when a channel switching instruction is received, switching the audio/video packet identifier of the audio/video filter to the audio/video packet identifier of the target program, and acquiring audio/video data corresponding to the audio/video packet identifier of the target program through the audio/video filter; obtaining a corresponding control word according to a program mapping table of a target program cached in advance, and setting a descrambler according to the control word; and descrambling the audio and video data through a descrambler, decoding the descrambled audio and video data, and playing the decoded audio and video data. The method, the terminal and the computer readable medium for rapidly changing the channel of the digital television provided by the embodiment of the invention directly switch the audio and video packet identifier of the audio and video filter, and the descrambler directly descrambles the audio and video data filtered by the audio and video filter, thereby realizing rapid channel changing, reducing the cost and improving the user experience aiming at the user side which does not support multi-channel descrambling.
Description
Technical Field
The embodiment of the invention relates to the digital television technology, in particular to a method, a terminal and a computer readable medium for quickly changing channels of a digital television.
Background
In the current Digital television system, a service front end, a user end and a smart card cooperate to realize playing of programs, wherein a Digital Video Broadcasting (DVB) standard is one of Digital television standards. The DVB standard System includes a Conditional Access System (CAS), which is responsible for ensuring that DVB services are only received by users authorized to receive them.
A CA module at the front end of a service in the CAS system scrambles a program signal through a Control Word (CW) generated by a random code generator; encrypting the CW to generate an Entitlement Control Message (ECM); transmitting the ECM Packet to the user end together with the scrambled code stream through a multiplexer, wherein a Packet identifier (Packet ID, PID) of the ECM Packet is stored in a Program Map Table (PMT).
A CA module at a client side in the CAS system analyzes a PMT table of a target program to obtain an ECM PID, and an ECM data packet is filtered according to the ECM PID; when the used smart card is confirmed to be authorized, the ECM is decrypted by using the ECM secret key of the smart card to obtain CW; and descrambling the scrambled code stream by using the decrypted CW so as to normally decode and play the target program.
The specific processing flow of channel switching and descrambling performed by the user side is as follows:
1. after receiving the channel switching instruction, the set top box controls the CA module to stop receiving the PMT table of the current program;
2. the CA module releases the ECM filter resources and descrambler resources of the current program;
3. the user side stops the audio and video playing of the current program and releases the audio and video filter resources;
4. the method comprises the steps that a user side receives a PMT table of a target program, analyzes audio and video PID of the target program, applies for filter resources, and sets a filter according to the audio and video PID of the target program to receive audio and video data of the target program;
5. the user side sends the PMT table of the target program to a CA module to obtain an ECM PID;
6. the CA module applies for ECM filter resources and sets ECM PIDs to filter ECM data;
7. the CA module applies for descrambler resources and associates PID of the audio and video;
8. and the CA module acquires the CW obtained by analyzing the ECM data through the intelligent card, and sets a descrambler to descramble the target program.
The procedure is complicated and needs to be repeated every time the channel is changed, so that the channel changing speed needs to be improved. At present, a commonly used method for descrambling by fast channel change is to purchase a multi-channel descrambling database from a CA manufacturer to enable a user end to achieve multi-channel descrambling, thereby increasing the speed of channel change descrambling, for example, simultaneously analyzing CW of an upper program and a lower program in a program list to achieve simultaneous descrambling of three channels of programs. The method has the disadvantages that the cost for purchasing a multi-path descrambling database is higher than that for purchasing a single-path descrambling database, and not all the user terminals support multi-path descrambling.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, a terminal, and a computer readable medium for fast channel change of a digital television, so as to implement fast channel change for a single-channel descrambling user side, reduce cost, and improve user experience.
In a first aspect, an embodiment of the present invention provides a method for quickly changing channels of a digital television, including:
when a channel switching instruction is received, switching an audio/video packet identifier of an audio/video filter to an audio/video packet identifier of a target program, and acquiring audio/video data corresponding to the audio/video packet identifier of the target program through the audio/video filter;
obtaining a corresponding control word according to a program mapping table of the target program cached in advance, and setting a descrambler according to the control word;
and descrambling the audio and video data acquired by the audio and video filter through the descrambler, decoding the descrambled audio and video data, and playing the decoded audio and video data.
In a second aspect, an embodiment of the present invention provides a terminal, including:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method for zapping a digital television according to any of the embodiments of the present invention.
In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a method for fast zapping a digital television according to any embodiment of the present invention.
According to the method, the terminal and the computer readable medium for rapidly changing the channel of the digital television, provided by the embodiment of the invention, the audio and video packet identifier of the audio and video filter is directly switched without releasing and reapplying the audio and video filter resources, so that the time for releasing and applying the audio and video filter resources is saved; by associating the descrambler with the audio/video filter, the descrambler can directly descramble the audio/video data filtered by the audio/video filter without releasing and applying descrambler resources or re-associating the descrambler with the audio/video PID of the target program, so that the time for releasing and applying the descrambler resources is saved, the time for re-associating the descrambler with the audio/video PID of the target program is saved, the fast channel change is realized for a single-channel descrambled user side, the cost is reduced, and the user experience is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a method for fast channel change of a digital television according to an embodiment of the present invention;
fig. 2 is a flowchart of a preferred embodiment of a step of obtaining a corresponding control word according to a program mapping table of a target program cached in advance in a method for quickly changing channels of a digital television according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a terminal according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a flowchart of a method for quickly changing a channel of a digital television according to an embodiment of the present invention, where this embodiment is applicable to a situation of quickly changing a channel of a user side with single-channel descrambling, and the method may be implemented by a terminal, for example, a digital television set-top box, or a television with a built-in digital television set-top box, or a terminal that uses a computer receiving card to watch a digital television program or form interaction, and may be implemented specifically by software and/or hardware in the terminal. Referring to fig. 1, the method for rapidly changing channels of a digital television comprises the following steps:
s110, when a channel switching instruction is received, switching the audio and video packet identification of the audio and video filter to the audio and video packet identification of the target program, and acquiring audio and video data corresponding to the audio and video packet identification of the target program through the audio and video filter.
The channel switching instruction can be a channel switching instruction sent by a remote control terminal; the remote control end can be a remote controller with physical keys, touch keys and/or virtual keys, or an intelligent terminal (such as a mobile phone, a tablet personal computer and the like) connected with the quick channel switching terminal through application software, namely, a channel switching instruction can be an infrared signal or data information; when the remote control terminal is an intelligent terminal, a channel switching instruction can be generated through touch actions of clicking, sliding and the like on the touch screen, and a channel switching instruction can also be generated through pressing of physical keys.
The audio/video filter can be an audio/video filter automatically applied after the terminal is started or a pre-applied audio/video filter, and the filter can be directly switched through switching audio/video PID without releasing after application.
Illustratively, if the currently played program of the terminal is the program of the central station 1, the audio/video PID currently set by the audio/video filter of the terminal is the program audio/video PID of the central station 1. The terminal needs to be switched to a target playing program after receiving a channel switching instruction, the target playing program is supposed to be a program of the phoenix satellite television, at the moment, the terminal does not need to release a current audio and video filter, then a new audio and video filter is applied again, the audio and video PID of the new audio and video filter is set to be the program audio and video PID of the phoenix satellite television, and the audio and video PID of the original audio and video filter is only needed to be switched to be the audio and video PID of the program of the phoenix satellite television. By directly switching the audio and video PID of the audio and video filter without releasing and reapplying the audio and video filter resource, the time for releasing and applying the audio and video filter resource is saved, and the channel switching speed is improved.
Optionally, before receiving the channel switching instruction, the method further includes: receiving and caching a program mapping table by a background; and analyzing the program mapping table to obtain the audio and video packet identifier.
Under the condition that the hardware condition of the terminal allows, for example, when the terminal comprises a plurality of tuners, the background can perform frequency locking and receiving of other programs while normal playing of the current program is not influenced. PMTs of other programs are received and cached through the background, and the PMTs of the other programs are analyzed, so that audio and video PIDs of the other programs can be obtained, the time for receiving the PMTs of the target program during channel change can be saved, and the channel change speed is improved.
Further, the receiving and caching the program mapping table by the background may include: receiving and caching program mapping tables of all programs of a current frequency point; and when the program mapping tables of all programs of the current frequency point are successfully cached, switching to the next frequency point, and taking the next frequency point as the current frequency point until the program mapping tables of all frequency points are successfully cached.
The more the bandwidth is wider, the lower the definition of the program data is, the more the number of sets of programs that can be transmitted by each frequency point is. Illustratively, when the 8M bandwidth standard is adopted, 8 sets of standard definition program data or 4 sets of high definition program data can be transmitted in each frequency point.
Wherein, when collecting and caching all programs PMT, can collect PMT of all programs under the current frequency point, then after the PMT of all programs of the current frequency point of successful cache, judge whether still have the frequency point of uncached, if exist, then can switch to next frequency point, collect and cache the PMT of all programs of next frequency point, until successfully caching the PMT of all frequency points, then can stop collecting.
The PMT received may be cached in a default cache path, or a set entry may be reserved, so that a user may set a cache path through the set entry.
Optionally, when the terminal detects that the program PMT is updated, the updated program PMT may be automatically cached.
Further, analyzing the program mapping table to obtain an audio/video packet identifier may include: after receiving the program mapping table of a program, analyzing the received program mapping table of a program to obtain an audio and video packet identifier of the received program; or after receiving the program mapping tables of all the programs of all the frequency points, analyzing the program mapping tables of all the programs according to the receiving sequence to obtain the audio and video packet identifiers of all the programs.
The audio and video PID corresponding to each program can be obtained by synchronously receiving and analyzing the PMT or analyzing the PMT after the receiving is finished, when the terminal receives a channel change instruction, the audio and video PID of the target program obtained by analysis can be directly used for setting an audio and video filter, the time for analyzing the audio and video PID of the target program obtained by the PMT is saved, and the channel change speed is improved.
And S120, obtaining corresponding control words according to a program mapping table of a target program cached in advance, and setting a descrambler according to the control words.
Specifically, the target program ECM PID can be obtained by analyzing the PMT of the target program; an ECM filter may be set according to the ECMPID to filter ECMs of the target program; the CW of the target program can be obtained by analyzing the ECM; a descrambler is set according to the CW of the target program, and the target program data can be descrambled by the descrambler.
Optionally, fig. 2 provides a flowchart of a preferred embodiment of a step of obtaining a corresponding control word according to a program mapping table of a target program cached in advance in a method for quickly changing channels of a digital television. Referring to fig. 2, obtaining a corresponding control word according to a program mapping table of a target program cached in advance includes:
s121, sending a program mapping table of a target program cached in advance to a conditional access module, and analyzing the program mapping table through the conditional access module to obtain an authorization control information packet identifier of the target program;
s122, obtaining authorization control information corresponding to the authorization control information packet identifier of the target program through an authorization control information filter;
and S123, analyzing the authorization control information through the intelligent card to obtain a corresponding control word.
Optionally, obtaining the authorization control information corresponding to the authorization control information packet identifier of the target program through the authorization control information filter includes: and switching the authorization control information packet identifier of the authorization control information filter into the authorization control information packet identifier of the target program, and acquiring the authorization control information of the target program through the authorization control information filter.
The ECM filter can be an ECM filter automatically applied after the terminal is started or an ECM filter applied in advance, and the filter can be switched over the received ECM data directly by switching over the ECM PID without releasing after application, so that the time for releasing and applying the ECM filter resources is saved, and the channel switching speed is improved.
Optionally, parsing the authorization control information through the smart card to obtain a corresponding control word includes: and sending the authorization control information of the target program to the smart card, and decrypting the authorization control information of the target program through an authorization control information key in the smart card to obtain a control word of the target program.
Optionally, before sending the program mapping table of the target program cached in advance to the conditional access module, the method further includes: and controlling the conditional access module to stop receiving the program mapping table of the current program according to the channel switching instruction.
S130, descrambling the audio and video data obtained by the audio and video filter through the descrambler, decoding the descrambled audio and video data, and playing the decoded audio and video data.
The descrambler can be a descrambler automatically applied after the terminal is started or a descrambler applied in advance, and the descrambler can be directly associated with an audio/video filter instead of an audio/video PID after application. By directly associating the descrambler with the audio/video filter, the terminal can descramble the audio/video data of the target program obtained by the audio/video filter through the original descrambler without releasing and reapplying descrambler resources and associating a new descrambler with the audio/video PID of the target program when receiving a channel change instruction, so that the time for releasing and applying the descrambler resources is saved, the time for associating the newly applied descrambler with the target audio/video PID is also saved, and the channel change speed is improved.
According to the method for quickly changing the channel of the digital television, provided by the embodiment of the invention, the audio and video packet identifier of the audio and video filter is directly switched without releasing and reapplying the audio and video filter resources, so that the time for releasing and applying the audio and video filter resources is saved; by associating the descrambler with the audio/video filter, the descrambler can directly descramble the audio/video data filtered by the audio/video filter without releasing and applying descrambler resources or re-associating the descrambler with the audio/video PID of the target program, so that the time for releasing and applying the descrambler resources is saved, the time for re-associating the descrambler with the audio/video PID of the target program is saved, the fast channel change is realized for a single-channel descrambled user side, the cost is reduced, and the user experience is improved.
Example two
The embodiment provides a terminal which can be used for rapidly changing channels of a digital television. Fig. 3 is a schematic structural diagram of a terminal according to a second embodiment of the present invention. Referring to fig. 3, the terminal includes:
one or more processors 310;
a memory 320 for storing one or more programs;
when the one or more programs are executed by the one or more processors 310, the one or more processors 310 may implement the method for zapping a digital television as set forth in one embodiment.
In FIG. 3, a processor 310 is illustrated as an example; the processor 310 and the memory 320 may be connected by a bus or other means, such as the bus connection shown in FIG. 3.
The memory 320 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the method for fast zapping a digital tv in the embodiment of the present invention. The processor 310 executes various functional applications and data processing of the terminal by executing software programs, instructions and modules stored in the memory 320, so as to implement the above-mentioned method for zapping a digital television.
The memory 320 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 320 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 320 may further include memory located remotely from the processor 310, which may be connected to the terminal over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
In addition, according to different forms of the terminal, in addition to the processor 310 and the memory 320, the terminal may further include other modules or structures, for example, if the terminal needs to receive an external channel switching instruction, the terminal further includes a channel switching instruction receiving module; if the terminal needs to decrypt the authorization control information through the smart card, the terminal further includes the smart card, which is used for decrypting the authorization control information to obtain the control word so as to descramble the target program.
The terminal and the method for quickly changing channels of a digital television set provided in the first embodiment belong to the same inventive concept, and technical details that are not described in detail in the first embodiment can be referred to in the first embodiment, and the first embodiment have the same beneficial effects.
EXAMPLE III
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for fast zapping of a digital television set as set forth in an embodiment.
The computer-readable storage medium provided by the present embodiment and the method for quickly changing channels of a digital television provided by the first embodiment belong to the same inventive concept, and technical details that are not described in detail in the present embodiment can be referred to the first embodiment, and the present embodiment and the first embodiment have the same beneficial effects.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for fast channel switching of digital TV is suitable for a user side descrambling a single channel, and is characterized by comprising the following steps:
when a channel switching instruction is received, switching an audio/video packet identifier of an audio/video filter to an audio/video packet identifier of a target program, and acquiring audio/video data corresponding to the audio/video packet identifier of the target program through the audio/video filter;
obtaining a corresponding control word according to a program mapping table of the target program cached in advance, and setting a descrambler according to the control word;
descrambling the audio and video data acquired by the audio and video filter through the descrambler, decoding the descrambled audio and video data, and playing the decoded audio and video data;
the audio/video filter is an audio/video filter which is automatically applied after a user terminal is started or an audio/video filter which is applied in advance, is not released after application, and realizes the switching of received audio/video data by switching an audio/video packet identifier;
the descrambler is automatically applied after a user side is started or is applied in advance, the descrambler is associated with the audio and video filter after application and is not released when a channel change instruction is received, and the audio and video data of a target program acquired by the audio and video filter are descrambled by the descrambler.
2. The method of claim 1, further comprising, prior to receiving the zapping instruction:
receiving and caching a program mapping table by a background;
and analyzing the program mapping table to obtain an audio and video packet identifier.
3. The method of claim 2, wherein the background receiving and caching the program map table comprises:
receiving and caching program mapping tables of all programs of a current frequency point;
and when the program mapping tables of all programs of the current frequency point are successfully cached, switching to the next frequency point, and taking the next frequency point as the current frequency point until the program mapping tables of all frequency points are successfully cached.
4. The method of claim 3, wherein the parsing the program mapping table to obtain an audio/video packet identifier comprises:
after receiving the program mapping table of a program, analyzing the received program mapping table of a program to obtain an audio and video packet identifier of the received program;
or after receiving the program mapping tables of all the programs of all the frequency points, analyzing the program mapping tables of all the programs according to the receiving sequence to obtain the audio and video packet identifiers of all the programs.
5. The method according to claim 1, wherein obtaining the corresponding control word according to the pre-cached program mapping table of the target program comprises:
sending a program mapping table of a target program cached in advance to a condition receiving module, and analyzing the program mapping table through the condition receiving module to obtain an authorization control information packet identifier of the target program;
obtaining authorization control information corresponding to the authorization control information packet identifier of the target program through an authorization control information filter;
and analyzing the authorization control information through the intelligent card to obtain a corresponding control word.
6. The method of claim 5, wherein the obtaining of the entitlement control message corresponding to the entitlement control message packet identifier of the target program through the entitlement control message filter comprises:
and switching the authorization control information packet identifier of the authorization control information filter into the authorization control information packet identifier of the target program, and acquiring the authorization control information of the target program through the authorization control information filter.
7. The method of claim 5, wherein parsing the entitlement control message via the smart card to obtain the corresponding control word comprises:
and sending the authorization control information of the target program to an intelligent card, and decrypting the authorization control information of the target program through an authorization control information key in the intelligent card to obtain a control word of the target program.
8. The method according to claim 5, before said sending the program mapping table of the target program cached in advance to the conditional access module, further comprising:
and controlling the conditional access module to stop receiving the program mapping table of the current program according to the channel switching instruction.
9. A terminal, characterized in that the terminal comprises:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method for digital television zapping of any of claims 1-8.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method of zapping a digital television according to any one of claims 1 to 8.
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| CN113038150B (en) * | 2019-12-09 | 2023-09-12 | 青岛海信宽带多媒体技术有限公司 | Program switching method and device |
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