WO2018099331A1 - Procédé et appareil de commutation de canaux de télévision numérique - Google Patents

Procédé et appareil de commutation de canaux de télévision numérique Download PDF

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Publication number
WO2018099331A1
WO2018099331A1 PCT/CN2017/112894 CN2017112894W WO2018099331A1 WO 2018099331 A1 WO2018099331 A1 WO 2018099331A1 CN 2017112894 W CN2017112894 W CN 2017112894W WO 2018099331 A1 WO2018099331 A1 WO 2018099331A1
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WIPO (PCT)
Prior art keywords
control word
program
target
ecm
data packet
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PCT/CN2017/112894
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English (en)
Chinese (zh)
Inventor
高翔
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深圳创维数字技术有限公司
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Publication of WO2018099331A1 publication Critical patent/WO2018099331A1/fr

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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
    • H04N21/432—Content retrieval operation from a local storage medium, e.g. hard-disk
    • 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
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • 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
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]

Definitions

  • the present disclosure relates to the field of digital television, for example, to a method and apparatus for digital television switching.
  • Digital TV provides people with rich program content and high-quality audio-visual enjoyment. Compared with analog TV, the signal loss is small and the receiving effect is good. However, digital TV has an obvious disadvantage: it is slow for the scrambled program, and the user experience is poor. .
  • the digital television system is coordinated by a smart card, a set top box, and a service front end to implement program playback.
  • the service front end sends the scrambled transport stream of the program to the set top box.
  • the set top box needs to set the descrambler in the set top box based on the CW (Control Word) of the program, so as to continuously descramble the scrambled transport stream and play it.
  • CW Control Word
  • the acquisition of the program CW requires obtaining an ECM (Entitlement Control Message) data packet from the service front end, and then selecting the ECM data of the program from the ECM data packet, and then the smart card analyzes and obtains the CW of the program according to the ECM data.
  • ECM Entitlement Control Message
  • the present disclosure provides a method and apparatus for digital TV channel switching, which realizes fast channel change descrambling of a scrambled program with less hardware resources and has universal applicability.
  • the embodiment provides a method for digital TV switching, including:
  • a descrambler is set according to the target control word to descramble the target program data stream pushed by the service front end to the set top box and played.
  • the embodiment further provides an apparatus for digital TV switching, including:
  • a channel change command receiving module configured to receive a user input switch command to switch to the target program
  • a target control word query module configured to query a target control word of the target program in a control word data table stored in the set top box
  • the first descrambling play module is configured to: when the target control word is queried, set a descrambler according to the target control word to descramble the target program data stream pushed by the service front end to the set top box and play.
  • the embodiment further provides a computer readable storage medium storing computer executable instructions for performing the method of any of the above.
  • the embodiment further provides a terminal, including at least one processor
  • a memory communicatively coupled to the at least one processor
  • the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to perform the method of any of the above.
  • the descrambler descrambles the target program according to the target control word, and switches to the target program. Realize fast channel change and descrambling.
  • FIG. 1 is a schematic flow chart of a method for digital TV switching according to Embodiment 1;
  • FIG. 2 is a schematic flow chart of a method for digital TV switching according to the second embodiment
  • FIG. 3 is a schematic flowchart of an optional implementation manner of generating a control word data table according to Embodiment 3;
  • FIG. 4 is a schematic structural diagram of an apparatus for digital TV switching according to Embodiment 4.
  • FIG. 5 is a schematic structural diagram of an apparatus for digital TV switching according to Embodiment 5;
  • FIG. 5 is a schematic structural diagram of an apparatus for digital TV switching according to Embodiment 5;
  • FIG. 6 is a schematic structural diagram of an optional implementation manner of a control word data table generating module provided in Embodiment 6;
  • FIG. 7 is a structural block diagram of a terminal provided in the seventh embodiment.
  • FIG. 1 is a schematic flowchart of a method for digital TV switching according to the first embodiment.
  • the method of this embodiment may be implemented by a terminal consisting of a set top box and a smart card, and is suitable for a scenario in which a user performs a channel change operation on a scrambled program.
  • the method for digital TV switching in this embodiment may include the following steps: S110-S130.
  • the user when a user who is watching a television program has a need to change channels, the user can input a channel change command to switch to the target program through a remote controller of the set top box or a control panel on the television set, and the set top box receives the command and responds accordingly.
  • the program information of the target program (including the Transport ID, the Source ID, and the service ID) is read from the database, and the target program can be uniquely determined by the program information.
  • the target control word of the target program is queried in the control word data table stored in the set top box.
  • a control word data table is stored in the set top box memory, and the data table includes program information of the plurality of programs and a control word corresponding to the program, and the program information of the target program is used to query from the control word data table.
  • a descrambler is set according to the target control word to descramble the target program data stream pushed by the service front end to the set top box and played.
  • the set top box directly sets the descrambler according to the target control word, and descrambles the target program data stream in the transport stream acquired from the service front end. And the descrambled program data is output and played, and the platform is quickly changed.
  • the programs mentioned in this embodiment all refer to scrambled programs, and the problem of descrambling and fast switching is only involved for scrambled programs.
  • the terminal receives the channel change command input by the user and switches to the target program, and queries the target control word of the target program in the control word data table stored in the set top box, if the target control word exists, Then, a descrambler is set according to the target control word to descramble the target program data stream pushed by the service front end to the set top box and played.
  • the terminal queries the control word data table stored in the set top box.
  • the descrambler descrambles the target program according to the target control word, and switches to the target program to achieve fast Switch to the station to descramble.
  • FIG. 2 is a schematic flowchart of a method for digital TV switching according to the second embodiment.
  • the main difference between this embodiment and the first embodiment includes: on the basis of the first embodiment, the processing flow when the target control word of the target program does not exist in the control word data table is added.
  • the method for digital TV station switching in this embodiment may further include the following steps after S120: S210-S260.
  • the control word data table stored by the set top box cannot completely include the program information and control words of all programs.
  • the service front end is configured with 10 channels for a specific frequency point, but this frequency point can only support 8 channels at the same time, and the program data stream of the 2 channels of the program is not in the transmission stream of the server front end, therefore, when When the user requests to switch to one of the two programs, the program information of the two programs and the corresponding control words are not queried from the control word data table; for example, when the user requests to switch to the adjacent frequency point of the current frequency point, In the program, the program stream of the program at the current frequency point may be included in the transport stream of the service front end. Therefore, at this time, the target control word of the target program is not found in the data table.
  • the set top box When there is no target control word of the target program in the control word data table, the set top box issues a switching request to the service front end to switch to the target program according to the received channel switching instruction, to request the service front end to add the program data of the target program to the transport stream and Transfer to the set top box.
  • the transport stream sent by the service front end is received, and the program map PMT of the target program is obtained from the transport stream and parsed, and the packet identifier PID corresponding to the authorization control information ECM packet is obtained.
  • the set top box receives the transport stream sent by the service front end, extracts a program map table (PMT) of the target program from the transport stream according to the program information of the target program, parses the PMT, and obtains the transport stream.
  • PMT program map table
  • the packet identifier PID corresponding to the ECM packet in the medium.
  • a filter is set according to the filtering parameter and the PID to filter the transport stream to obtain an ECM data packet.
  • the range of the filtering parameters is preset, and the filtering parameters are alternately changed between 0x80 and 0x81. For example, if the current filtering parameter is 0x80, the filtering parameter is modified to 0x81 after receiving the ECM packet again.
  • the set top box sets a filter according to the preset filtering parameters and the PID corresponding to the ECM data packet, filters the transport stream obtained from the service front end, and obtains the ECM data packet in the transport stream.
  • the ECM data packet is transmitted to the smart card, and the target control word determined by the smart card according to the ECM data packet parsing is obtained.
  • the set top box transmits the obtained ECM data packet to the smart card, and the smart card decrypts the ECM data packet to obtain a corresponding control word data packet, and the smart card returns the control word data packet to the set top box, and the set top box controls the program according to the program information of the target program.
  • the target control word of the target program is extracted from the word data packet.
  • the target control word is updated to the control word data table.
  • the set top box updates the control words of the target control word and other programs into the control word data table based on the program information of the plurality of programs.
  • a descrambler is set according to the target control word to descramble the target program data stream pushed by the service front end to the set top box and played.
  • the set top box sets a descrambler according to the extracted target control word, and the descrambler descrambles the program data stream of the target program in the transport stream of the service front end, obtains the program data of the target program, and outputs the play data.
  • the ECM packet includes ECM data for all programs at the current frequency.
  • the ECM data packet includes ECM data of all programs under the current frequency point and adjacent frequency points.
  • the terminal when the target control word of the target program does not exist in the set top box control word data table, the terminal obtains the target program by acquiring the PMT of the target program, parsing the PMT, filtering the ECM data packet, and intelligent card communication.
  • the target control word is updated to the control word data table, and the descrambler is set according to the target control word, and the program data stream of the target program is descrambled to realize the channel descrambling.
  • FIG. 3 is a schematic flowchart of an optional implementation manner of generating a control word data table according to Embodiment 3.
  • This embodiment provides an alternative embodiment of generating a control word data table based on any of the above embodiments.
  • An optional implementation manner of generating a control word data table provided by the present implementation may include the following steps before the foregoing S110: S310-S350.
  • the transport stream sent by the service front end is received, and the program map PMT is obtained from the transport stream and parsed to obtain a packet identifier PID corresponding to the ECM data packet.
  • the server front end transmits the transport stream
  • the ECM data packet in the transport stream is transmitted in the first set format described below.
  • a filter is set according to the filtering parameter and the PID, and the ECM data packet is obtained by filtering the transport stream, wherein the ECM data packet is stored according to the first setting format.
  • the first setting format is specifically the following content separated by a spacer: command header information, program 1 information, program 1 ECM data, program 2 information, program 2 ECM data, .... .., program n information, ECM data of program n, where n is the number of programs.
  • the ECM data packet is transmitted to the smart card.
  • the receiving smart card parses and determines the determined control word data packet according to the first setting format of the ECM data packet, wherein the control word data packet stores the program information and the control word and the corresponding relationship according to the second setting format.
  • the second setting format is specifically the following content separated by a spacer: a command header Information, Program 1 Information, CW/Error Value for Program 1, Program 2 Information, CW/Error Value for Program 2, ..., Program n Information, CW/Error Value for Program n.
  • a command header Information Program 1 Information, CW/Error Value for Program 1
  • Program 2 Information Program 2 Information
  • Program n Information Program CW/Error Value for Program n.
  • the ECM packet transmission from the server front end to the set top box and the ECM data packet transmission from the set top box to the smart card are transmitted in the first set format, and the control word data packet transmission of the smart card to the set top box is transmitted in the second set format, that is, the server front end,
  • the data is transmitted between the set-top box and the smart card in an agreed format.
  • the smart card Since the service front end and the set top box transmit the ECM data packet according to the agreed first setting format, the smart card can recognize the ECM data of the plurality of programs in the ECM data packet, and at the same time, the smart card transmits and controls according to the agreed second setting format.
  • a word packet, the set top box can also identify the control words of multiple programs in the control word packet.
  • the set-top box only needs to set one filter to obtain an ECM data packet, which makes the method of the present embodiment occupy less hardware resources; meanwhile, in the smart card communication operation of the S330 and the S340, The set-top box and the smart card only need to transmit data once to each other, that is, the set-top box only needs to transmit the ECM data packet to the smart card once, and the smart card only needs to return the control word data packet to the set-top box once, which makes the smart card communication time in the method of the implementation short. Occupies less hardware resources.
  • control word corresponding to each of the plurality of programs is obtained according to program information of the plurality of programs, and a control word data table is generated.
  • a control word corresponding to the plurality of programs may be extracted from the control word data packet, and the control word data table is generated according to the program information of the plurality of programs and the corresponding control word.
  • the terminal after the channel is successfully changed, in order to achieve continuous playback of the target program, the target program needs to be continuously descrambled. Therefore, after the channel is successfully changed, the terminal also performs the following operations (not shown):
  • the operation of updating the target control word is performed every preset time period, and the descrambler is set to descramble according to the updated target control word until receiving the shutdown command or receiving the channel change command again.
  • the operation of updating the target control word includes:
  • the preset time period may be 10 seconds, that is, the ECM data and the control word of the program change every 10 seconds. In other embodiments, the preset time period may also be 5 seconds or other values.
  • the server front end, the set top box and the smart card perform data communication according to the agreed format, and the terminal also obtains operations such as PMT, parsing PMT, filtering ECM data packet and smart card communication of the target program, and related technologies.
  • operations such as PMT, parsing PMT, filtering ECM data packet and smart card communication of the target program, and related technologies.
  • fewer filters are required, smart card communication time is shorter, and less hardware resources are used, so that fast descrambling and fast channel change can be realized more quickly.
  • the following is an embodiment of the apparatus for digital TV switching provided by the embodiment.
  • the apparatus for digital TV switching is the same concept as the method for digital TV switching, and is not described in detail in the embodiment of the apparatus for digital TV switching.
  • FIG. 4 is a schematic structural diagram of an apparatus for digital TV channel change according to Embodiment 4.
  • the channel change command receiving module 410 is configured to receive a channel change command input by the user and switch to the target program.
  • the target control word query module 420 is configured to query the target control word of the target program in the control word data table stored in the set top box.
  • the first descrambling playback module 430 is configured to set a descrambler according to the target control word to descramble the target program data stream pushed by the service front end to the set top box and play it if the target control word is present.
  • the terminal receives the channel change command input by the user and switches to the target program, and queries the target control word of the target program in the control word data table stored in the set top box, if the target control word exists, Then, a descrambler is set according to the target control word to descramble the target program data stream pushed by the service front end to the set top box and played.
  • the terminal queries the control word data table stored in the set top box.
  • the descrambler descrambles the target program according to the target control word, and switches to the target program to achieve fast Switch to the station to descramble.
  • FIG. 5 is a schematic structural diagram of an apparatus for digital TV switching according to Embodiment 5.
  • the main difference between this embodiment and the fourth embodiment is that, based on the fourth embodiment, when the target control word of the target program does not exist in the control word data table, the plurality of functional modules included in the digital television channel changing device are further included. .
  • the device for digital TV channel switching may further include the following content based on the fourth embodiment:
  • the handover request transmitting module 510 is configured to transmit a handover request of the target program to the service front end if the target control word does not exist.
  • the PMT parsing module 520 is configured to receive the transport stream sent by the service front end, obtain the program map PMT of the target program from the transport stream, and parse the packet identifier PID corresponding to the authorization control information ECM data packet.
  • the ECM packet filtering module 530 is configured to set a filter according to the filtering parameters and the PID to filter the transport stream to obtain an ECM packet.
  • the smart card communication module 540 is configured to transmit the ECM data packet to the smart card, and acquire the target control word determined by the smart card according to the ECM data packet parsing.
  • the control word data table update module 550 is configured to update the target control word into the control word data table.
  • the second descrambling playback module 560 is configured to set a descrambler according to the target control word to descramble the target program data stream pushed by the service front end to the set top box and play.
  • the ECM packet includes ECM data for all programs at the current frequency.
  • the ECM data packet includes ECM data of all programs under the current frequency point and adjacent frequency points.
  • the terminal when the target control word of the target program does not exist in the set top box control word data table, the terminal obtains the target program by acquiring the PMT of the target program, parsing the PMT, filtering the ECM data packet, and intelligent card communication.
  • the target control word is updated to the control word data table, and the descrambler is set according to the target control word, and the program data stream of the target program is descrambled to realize the channel descrambling.
  • FIG. 6 is a schematic structural diagram of an optional implementation manner of the control word data table generating module 610 provided in the sixth embodiment.
  • the control word data table generating module 610 is further added, and an optional implementation manner of the control word data table generating module 610 is further provided.
  • the control word data table generation module 610 is arranged to generate a control word data table.
  • the periodic descrambling module (not shown) is configured to perform an operation of updating the target control word every preset time period during the playing of the target program, and set the descrambler according to the updated target control word to solve Disturb until receiving a shutdown command or receiving a channel change command again.
  • the operation of updating the target control word includes:
  • control word data table generating module 610 may include the following content:
  • the PMT parsing unit 611 is configured to receive the transport stream transmitted by the service front end, obtain the program map PMT from the transport stream, and parse the packet to obtain the packet identifier PID corresponding to the ECM packet.
  • the ECM packet filtering unit 612 is configured to set a filter according to the filtering parameter and the PID to filter the transport stream to obtain an ECM data packet, wherein the ECM data packet is stored according to the first setting format.
  • the ECM packet transmitting unit 613 is configured to transmit the ECM packet to the smart card.
  • the control word data packet receiving unit 614 is configured to receive the control word data packet that is determined by the smart card according to the first setting format of the ECM data packet, where the control word data packet stores the program information and the control word according to the second setting format. And the corresponding relationship.
  • the control word data table generating unit 615 is configured to obtain a control word data table to obtain control words of a plurality of programs from the program information of the plurality of programs and generate a control word data table.
  • the server front end, the set top box and the smart card perform data communication according to the agreed format, and the terminal also obtains operations such as PMT, parsing PMT, filtering ECM data packet and smart card communication of the target program, and related technologies.
  • operations such as PMT, parsing PMT, filtering ECM data packet and smart card communication of the target program, and related technologies.
  • fewer filters are required, smart card communication time is shorter, and less hardware resources are used, so that fast descrambling and fast channel change can be realized more quickly.
  • the embodiment further provides a computer readable storage medium storing computer executable instructions for performing the method of digital TV switching described in the above embodiments.
  • FIG. 7 is a structural block diagram of a terminal provided in the seventh embodiment.
  • the terminal provided in this embodiment may include a processor 701 and a memory 703, and may further include a communications interface 702 and a bus 704.
  • the memory 703 can complete communication with each other through the bus 704.
  • Communication interface 702 can be used for information transfer.
  • the processor 701 can call the logic instructions in the memory 703 to perform the digital television channel changing method of the above embodiment.
  • the logic instructions in the memory 703 described above may be implemented in the form of a software functional unit and sold or used as a stand-alone product, and may be stored in a computer readable storage medium.
  • the technical solution of the present disclosure may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network) The device or the like) performs all or part of the steps of the method described in various embodiments of the present disclosure.
  • the foregoing storage medium may be a non-transitory storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.
  • a medium that can store program code, or a transitory storage medium including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.
  • the digital television channel changing method provided by the present disclosure can quickly obtain the target control word, and use the target control word to set a descrambler to descramble the target program, switch to the target program, and implement fast channel switching descrambling.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention concerne un procédé de commutation de canaux de télévision numérique, comprenant les étapes consistant à : recevoir une instruction de commutation de canal d'entrée utilisateur pour la commutation vers un programme cible ; demander un mot de commande cible du programme cible dans une table de données de mots de commande stockée dans un boîtier décodeur ; et configurer un désembrouilleur conformément au mot de commande cible lorsque le mot de commande cible est trouvé, de manière à désembrouiller un flux de données de programme cible poussé par un frontal de service vers le boîtier décodeur et effectuer une lecture.
PCT/CN2017/112894 2016-11-29 2017-11-24 Procédé et appareil de commutation de canaux de télévision numérique WO2018099331A1 (fr)

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