WO2017128595A1 - Live broadcasting method and system for high-definition video transmission of digital television - Google Patents

Abstract

Disclosed in the present application are a live broadcasting method and system for high-definition video transmission of a digital television. The system comprises: a descrambler device, connected to the digital television through a coaxial cable, for receiving a digital television signal inputted from the coaxial cable of the digital television and descrambling the digital television signal according to a descrambling command transmitted by a routing device to obtain corresponding descrambled signal data, wherein, the descrambling command is a command generated by the routing device after receiving a program playing command transmitted by an intelligent terminal; a routing device, for performing a signal extraction process with respect to the descrambled signal data to obtain a corresponding audio and video stream of a single program; and an intelligent terminal, for acquiring the audio and video stream of the single program through a data transmission channel provided by the routing device, decoding the audio and video stream of the single program using an own video decoder and playing the obtained signal after decoding. The present application improves the tidiness of field cable wiring on the basis of decreased acquisition cost of a user.

Description

 Live broadcast system and method for digital television high-definition video forwarding Technical field

 The invention relates to the field of television live broadcast technology, in particular to a live broadcast system and method for digital TV high-definition video forwarding.

Background technique

Currently, digital image communication technology is widely used in digital television broadcasting systems. Nowadays, people usually watch rich digital TV programs by connecting TV cables to TV sets or connecting TV sets through set-top boxes. However, the above two methods inevitably lead to confusion of cable routing in the field, which adversely affects the overall viewing experience of the user, and requires additional decoders for decoding, which increases the user's purchase cost.

In summary, it can be seen that how to improve the cleanliness of the field wiring on the basis of reducing the user's purchase cost is currently a problem to be solved.

Technical solution

In view of this, the object of the present invention is to provide a live broadcast system and method for digital TV high-definition video forwarding, which realizes the purpose of improving the cleanliness of the field wiring on the basis of reducing the purchase cost of the user. The specific plan is as follows:

A live broadcast system for digital TV high-definition video forwarding, including a descrambling device, a routing device, and an intelligent terminal; wherein

The descrambling device is connected to a digital television coaxial cable for receiving a digital television signal input by the digital television coaxial cable, and performing the digital television signal according to a descrambling command sent by the routing device. The descrambling process is performed to obtain corresponding descrambling signal data; wherein the descrambling command is a command generated by the routing device after receiving a program play instruction sent by the smart terminal;

The routing device is configured to perform signal extraction processing on the descrambling signal data to obtain a corresponding single program audio and video stream;

The smart terminal is configured to acquire the single program audio and video stream by using a data transmission channel provided by the routing device, and decode the single program audio and video stream by using a video decoder of the same, and obtain the decoded The signal is played.

Preferably, the descrambling device comprises a tuning demodulation module, a first demultiplexing module, a conditional receiving module and an intelligent decryption module; wherein

The tuner and demodulation module is configured to receive a digital television signal input by the digital television coaxial cable, and perform demodulation processing on the digital television signal to obtain corresponding TS data;

The first demultiplexing module is configured to extract corresponding program data from the TS data by using a control word sent by the condition receiving module, and perform descrambling processing on the program data to obtain the descrambling signal. data;

The condition receiving module is configured to receive the descrambling command, and after receiving the descrambling command, extract, by using the first demultiplexing module, authorization control information from the TS data;

The intelligent decryption module is configured to decrypt the authorization control information, obtain the control word, and return the control word to the conditional receiving module.

Preferably, the intelligent decryption module is specifically a smart card that can be carried by a user or a software decryption module built in the descrambling device.

Preferably, the condition receiving module is further configured to: before receiving the descrambling command, receive a frequency locking command sent by the routing device, perform a corresponding frequency locking operation according to the frequency locking command, and succeed in frequency locking. After receiving the descrambling command, the frequency locking command is a command generated by the routing device after receiving a program play instruction sent by the smart terminal.

Preferably, the routing device includes an interaction server module, a second demultiplexing module, a database module, and a single program transport stream module;

The interaction server module is configured to receive a program play instruction sent by the smart terminal, and according to the program play instruction, retrieve a corresponding live program parameter from the database module, and generate the solution by using the live program parameter And a corresponding program stream processing command, and transmitting the descrambling command to the descrambling device;

The second demultiplexing module is configured to perform corresponding processing on the descrambling signal data according to the program stream processing command, and send the processed data to the single program transport stream module;

The single program transport stream module is configured to perform signal extraction on data sent by the second demultiplexing module to obtain the single program audio and video stream.

Preferably, the routing device further includes:

And a stream server module, connected to the single program transport stream module, configured to send the single program audio and video stream to the smart terminal.

Preferably, the smart terminal includes a user interface module, an interactive client module, and a multimedia play module;

The user interface module is configured to generate the program play instruction according to a touch operation of the user;

The interactive client module is configured to send the program play instruction to the routing device;

The multimedia playing module is configured to decode the single program audio and video stream by using the video decoder, and play the decoded signal.

Preferably, the routing device further includes a first device discovery notification module; correspondingly, the smart terminal further includes a second device discovery notification module;

The first device discovery notification module is configured to periodically send a Notify message to the outside world by using the fixed multicast address and the port before the smart terminal sends the program play instruction to the interaction server module;

The second device discovery notification module is configured to analyze the Notify message after receiving the Notify message, and obtain an IP address and port information of the interaction server module accordingly.

Preferably, the user interface module is further configured to send, by using the interactive client module, a search command input by a user to the interaction server module;

The interaction server module is further configured to: by using the second demultiplexing module, extract SI/PSI information corresponding to the search command from the descrambling signal data, to generate corresponding search progress information. And sending the search progress information to the interactive client module;

The user interface module is further configured to acquire the search progress information sent by the interactive client module, and display the search progress information in real time.

Preferably, the smart terminal is a smart mobile terminal or a smart TV; the data transmission channel is a WIFI channel or a transmission channel constructed by a network cable.

The invention also discloses a live broadcast method for digital TV high-definition video forwarding, comprising:

Receiving a digital television signal input by a digital television coaxial cable, and performing descrambling processing on the digital television signal according to a descrambling command sent by the routing device to obtain corresponding descrambling signal data;

Transmitting the descrambling signal data to the routing device, to perform signal extraction processing on the descrambled signal data by using the routing device, to obtain a corresponding single program audio and video stream, and provide data through the routing device. a transmission channel, sending the single program audio and video stream to the smart terminal;

Decoding the single program audio and video stream by using a video decoder of the smart terminal, and playing the decoded signal;

The descrambling command is a command generated by the routing device after receiving a program play instruction sent by the smart terminal.

In the present invention, the live broadcast system for digital TV high-definition video forwarding includes: a descrambling device connected to the digital television coaxial cable for receiving the digital television signal input by the digital television coaxial cable, and according to the descrambling command sent by the routing device De-scrambling the digital television signal to obtain corresponding descrambling signal data; wherein the descrambling command is a command generated by the routing device after receiving the program play instruction sent by the smart terminal; and the routing device is configured to the descramble signal The data is subjected to signal extraction processing to obtain a corresponding single program audio and video stream; the intelligent terminal is configured to obtain a single program audio and video stream through a data transmission channel provided by the routing device, and use a video decoder to perform a single program audio and video stream. Decode and play the decoded signal. It can be seen that the present invention utilizes a video decoder provided on the smart terminal for decoding, thereby eliminating the need to specifically add hardware decoding equipment, reducing the overall construction cost of the system, that is, reducing the purchase cost of the user, and additionally, due to the routing device. The wiring is relatively simple, which improves the cleanliness of the field wiring.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can obtain other drawings according to the provided drawings without any creative work.

1 is a schematic structural diagram of an application system of a live broadcast system for digital video high-definition video forwarding according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a specific application structure of a live broadcast system for digital video high-definition video forwarding according to an embodiment of the present invention; FIG.

FIG. 3 is a flowchart of a live broadcast method for digital video high-definition video forwarding according to an embodiment of the present invention.

Embodiments of the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the present invention discloses a live broadcast system for digital video high-definition video forwarding. As shown in FIG. 1 , the live broadcast system of the digital TV high-definition video forwarding includes a descrambling device 11, a routing device 12, and a smart terminal 13;

The descrambling device 11 is connected to the digital television coaxial cable for receiving the digital television signal input by the digital television coaxial cable, and descrambling the digital television signal according to the descrambling command sent by the routing device 12, and obtaining corresponding The descrambling signal data; wherein the descrambling command is a command generated by the routing device 12 after receiving the program play instruction sent by the smart terminal 13;

The routing device 12 is configured to perform signal extraction processing on the descrambled signal data to obtain a corresponding single program audio and video stream;

The smart terminal 13 is configured to obtain a single program audio and video stream through the data transmission channel provided by the routing device 12, decode the single program audio and video stream by using its own video decoder, and play the decoded signal.

The routing device 12 may specifically be a network switching device such as a router.

It should be noted that the above-mentioned descrambling device 11 can be used as a separate device for data communication with the routing device 12 through the USB data line. Of course, in order to further improve the integrity of the system, the descrambling device 11 can also be placed inside the routing device 12 through the PCI interface (PCI, ie Peripheral). Component Interconnect) or PCMCIA-based (PCMCIA, Personal Computer Memory Card International Association), which establishes a data transmission channel between the descrambling device 11 and the routing device 12.

In addition, it can be understood that, in order to obtain a single program audio and video stream, after obtaining the descrambling signal data, the routing device 12 needs to perform signal extraction processing on the descrambled signal data with respect to the single program audio and video stream to obtain corresponding signals. Single program audio and video streaming.

Secondly, the smart terminal 13 obtains the single program audio and video stream sent by the routing device 12 through the data transmission channel provided by the routing device 12, that is, the data transmitted by the data transmission channel is a single program sound converted by the digital television signal. Video stream. The smart terminal 13 has a video decoder, and the video decoder can decode the single program audio and video stream to obtain a corresponding decoded signal, and then use the player provided on the smart terminal 13 to perform the decoded signal. Playback, thereby achieving the purpose of watching a digital television live program on the smart terminal 13.

It can be understood that the smart terminal 13 may be a smart mobile terminal, such as a smart phone terminal, a tablet computer or a portable computer, and may of course be a smart TV. The data transmission channel provided by the routing device includes a WIFI channel or a transmission channel constructed by the network cable. For example, when the smart terminal is a smart mobile terminal, the corresponding digital television signal can be received through the WIFI channel provided by the routing device. When the smart terminal is a smart TV, the corresponding number is preferentially received through the WIFI channel provided by the routing device. TV signals, of course, can also use the network cable to set up a data transmission channel between the routing device and the smart TV.

In the embodiment of the present invention, the live broadcast system for digital TV high-definition video forwarding includes: a descrambling device connected to the digital television coaxial cable for receiving the digital television signal input by the digital television coaxial cable, and transmitting the solution according to the routing device Distracting the command, performing descrambling processing on the digital television signal, and obtaining corresponding descrambling signal data; wherein the descrambling command is a command generated by the routing device after receiving the program play instruction sent by the smart terminal; and the routing device is used for solving the solution The scrambling signal data is subjected to signal extraction processing to obtain a corresponding single program audio and video stream; the intelligent terminal is configured to obtain a single program audio and video stream through a data transmission channel provided by the routing device, and utilize a video decoder thereof to perform single program audio and video. The stream is decoded and the decoded signal is played. It can be seen that the embodiment of the present invention uses the video decoder provided on the smart terminal to perform decoding, thereby eliminating the need to specifically add hardware decoding devices, thereby reducing the overall construction cost of the system, that is, reducing the purchase cost of the user, and The wiring of the equipment is relatively simple, which improves the cleanliness of the field wiring.

The embodiment of the invention discloses a specific live broadcast system for digital video high-definition video forwarding. Compared with the previous embodiment, the technical solution is further illustrated and optimized in this embodiment. specific:

Referring to FIG. 2, in the embodiment, the descrambling device 11 may specifically include a tuning demodulation module 111 (ie, a Tuner+Demod module), a first demultiplexing module 112 (ie, a first Demux module), and a condition receiving module 113. (ie CA Core module, CA means Conditional Access) and intelligent decryption module 114;

The tuner module 111 is configured to receive a digital television signal input by the digital television coaxial cable, and perform demodulation processing on the digital television signal to obtain corresponding TS data (TS, ie, Transport) Stream, transport stream);

The first demultiplexing module 112 is configured to use the control word sent by the condition receiving module 113 (ie, CW, Control Word), extract corresponding program data from the TS data, and perform descrambling processing on the program data to obtain descrambling signal data;

The condition receiving module 113 is configured to receive the descrambling command, and after receiving the descrambling command, extract the authorization control information (ie, ECM, Entitle) from the TS data by using the first demultiplexing module 112. Control Message);

The intelligent decryption module 114 is configured to decrypt the authorization control information, obtain a control word, and return the control word to the condition receiving module 113.

It should be noted that the smart decryption module 114 is specifically a smart card that can be carried by a user or a software decryption module built in the descrambling device.

In addition, the condition receiving module 113 is further configured to: before receiving the descrambling command, receive the frequency locking command sent by the routing device 12, perform a corresponding frequency locking operation according to the frequency locking command, and start receiving the descrambling after the frequency locking succeeds. command. The frequency-lock command is a command generated by the routing device 12 after receiving the program play command sent by the smart terminal 13. That is, after the frequency locking is successful, the subsequent descrambling processing is performed.

Correspondingly, as shown in FIG. 2, the routing device 12 in this embodiment may specifically include an interaction server module 121 (ie, Interactive). Server module), second demultiplexing module 122 (ie, second Demux module), database module 123 (ie, Data Base module) and single program transport stream module 124 (SPTS module, SPTS means Single Program Transport Stream);

The interaction server module 121 is configured to receive a program play instruction sent by the smart terminal 13, and retrieve corresponding live program parameters from the database module 123 according to the program play instruction, and generate a descrambling command and a corresponding program stream by using the live program parameter. The command is processed and the descrambling command is transmitted to the descrambling device 11. For example, when the smart terminal 13 sends a program play instruction for instructing to play the A TV channel to the interaction server module 121, the interaction server module 121 retrieves the live program parameters corresponding to the A TV channel from the database module 123, such as Program band information, etc. It can be understood that the program parameter information of all live programs is pre-stored in the database module 123.

The second demultiplexing module 122 is configured to perform corresponding processing on the descrambling signal data according to the program stream processing command, and send the processed data to the single program transport stream module 124. The second demultiplexing module 122 performs different processing on the descrambling signal data according to the type of the program stream processing command. For example, the second demultiplexing module 122 may extract corresponding Section data from the TS data according to the program stream processing command, or perform information filtering on the TS data, and then send the remaining data to the single program transport stream module 124. .

The single program transport stream module 124 is configured to perform signal extraction on the data sent by the second demultiplexing module 122 to obtain a single program audio and video stream. It can be understood that the single program audio and video stream extracted by the single program transport stream module 124 is a data stream corresponding to the program play command sent by the smart terminal 13.

It should be noted that when the descrambling device is placed inside the routing device, the first demultiplexing module 112 and the second demultiplexing module 122 may be combined into one independent demultiplexing module, that is, only The work of the first demultiplexing module 112 and the second demultiplexing module 122 can be completed by a demultiplexing module.

Further, the routing device 12 in this embodiment may further include: a stream server module 125 (ie, Stream) The Server module is connected to the single program transport stream module 124 for transmitting the single program audio and video stream to the smart terminal 13.

As shown in FIG. 2, the smart terminal 13 in this embodiment may specifically include a user interface module 131 (ie, UI, User). Interface), interactive client module 132 (ie, Interactive Client module) and multimedia player module 133 (ie, Media) Player module); among them,

The user interface module 131 is configured to generate a program play instruction according to a touch operation of the user;

An interactive client module 132, configured to send a program play instruction to the routing device 12;

The multimedia playing module 133 is configured to decode the single program audio and video stream by using the video decoder, and play the decoded signal.

In the embodiment, the routing device 12 further includes a first device discovery notification module 126. In addition, the smart terminal 13 further includes a second device discovery notification module 134.

The first device discovery notification module 126 is configured to periodically send a Notify message to the outside world by using the fixed multicast address and the port before the smart terminal 13 sends the program play instruction to the interaction server module 121.

The second device discovery notification module 134 is configured to analyze the Notify message after receiving the Notify message, and obtain the IP address and port information of the interaction server module 121 accordingly.

Specifically, the first device discovery notification module 126 may be an SSDP server module (SSDP, ie, Simple Service). The Discovery Protocol (Simplified Service Discovery Protocol), correspondingly, the second device discovery notification module 134 is an SSDP client module.

Further, the user interface module 131 is further configured to send the search command input by the user to the interaction server module 121 through the interaction client module 132. The interaction server module 121 is further configured to use the second demultiplexing module 122. The SI/PSI information corresponding to the search command is extracted from the descrambling signal data (SI means Service) Information, that is, business information; PSI means Program Specific The information, that is, the program-specific information, is generated to generate the corresponding search progress information, and the search progress information is sent to the interactive client module 132. The user interface module 131 is further configured to obtain the search progress sent by the interactive client module 132. Information and real-time display of the progress information of the search. It can be understood that the corresponding frequency locking operation needs to be performed on the condition receiving module 113 before performing the search.

The embodiment of the invention also discloses a live broadcast method for digital video HD video forwarding. Referring to FIG. 3, the method includes:

Step S31: receiving a digital television signal input by the digital television coaxial cable, and performing descrambling processing on the digital television signal according to the descrambling command sent by the routing device to obtain corresponding descrambling signal data;

Step S32: Send the descrambling signal data to the routing device, to perform signal extraction processing on the descrambling signal data by using the routing device, obtain a corresponding single program audio and video stream, and use a data transmission channel provided by the routing device to perform a single program sound. The video stream is sent to the smart terminal;

Step S33: decoding the single program audio and video stream by using the video decoder of the smart terminal, and playing the decoded signal;

The descrambling command is a command generated by the routing device after receiving the program play instruction sent by the smart terminal.

The routing device may be specifically a network switching device such as a router.

In addition, for a more specific process of the above various steps, reference may be made to related content in the foregoing embodiments, and details are not described herein again.

It can be seen that the embodiment of the present invention uses the video decoder provided on the smart terminal to perform decoding, thereby eliminating the need to specifically add hardware decoding devices, thereby reducing the overall construction cost of the system, that is, reducing the purchase cost of the user, and The wiring of the equipment is relatively simple, which improves the cleanliness of the field wiring.

Finally, it should also be noted that in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. There is any such actual relationship or order between operations. Furthermore, the term "comprises" or "comprises" or "comprises" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The above is a detailed description of a digital television live broadcast system and method provided by the present invention. The principles and embodiments of the present invention are described in detail herein. The description of the above embodiments is only for helping to understand the present invention. The method and its core idea; at the same time, those skilled in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scope. In summary, the contents of this specification should not be construed as Limitations of the invention.

Claims (11)

 A live broadcast system for digital video high-definition video forwarding, comprising: a descrambling device, a routing device, and an intelligent terminal; wherein The descrambling device is connected to a digital television coaxial cable for receiving a digital television signal input by the digital television coaxial cable, and performing the digital television signal according to a descrambling command sent by the routing device. The descrambling process is performed to obtain corresponding descrambling signal data; wherein the descrambling command is a command generated by the routing device after receiving a program play instruction sent by the smart terminal; The routing device is configured to perform signal extraction processing on the descrambling signal data to obtain a corresponding single program audio and video stream; The smart terminal is configured to acquire the single program audio and video stream by using a data transmission channel provided by the routing device, and decode the single program audio and video stream by using a video decoder of the same, and obtain the decoded The signal is played. The live broadcast system for digital video high-definition video forwarding according to claim 1, wherein the descrambling device comprises a tuning demodulation module, a first demultiplexing module, a condition receiving module, and an intelligent decryption module; The tuner and demodulation module is configured to receive a digital television signal input by the digital television coaxial cable, and perform demodulation processing on the digital television signal to obtain corresponding TS data; The first demultiplexing module is configured to extract corresponding program data from the TS data by using a control word sent by the condition receiving module, and perform descrambling processing on the program data to obtain the descrambling signal. data; The condition receiving module is configured to receive the descrambling command, and after receiving the descrambling command, extract, by using the first demultiplexing module, authorization control information from the TS data; The intelligent decryption module is configured to decrypt the authorization control information, obtain the control word, and return the control word to the conditional receiving module. The live broadcast system for digital video high-definition video forwarding according to claim 2, wherein the intelligent decryption module is specifically a smart card that can be carried by a user or a software decryption module built in the descrambling device. The live broadcast system for digital video high-definition video forwarding according to claim 3, wherein the condition receiving module is further configured to receive a frequency-locking command sent by the routing device before receiving the descrambling command, according to The frequency-locking command performs a corresponding frequency-locking operation, and after the frequency-locking succeeds, starts to receive the descrambling command; wherein the frequency-locking command is that the routing device receives the program sent by the smart terminal. The command generated after the instruction. The live broadcast system for digital video high-definition video forwarding according to claim 4, wherein the routing device comprises an interaction server module, a second demultiplexing module, a database module, and a single program transport stream module; The interaction server module is configured to receive a program play instruction sent by the smart terminal, and according to the program play instruction, retrieve a corresponding live program parameter from the database module, and generate the solution by using the live program parameter And a corresponding program stream processing command, and transmitting the descrambling command to the descrambling device; The second demultiplexing module is configured to perform corresponding processing on the descrambling signal data according to the program stream processing command, and send the processed data to the single program transport stream module; The single program transport stream module is configured to perform signal extraction on data sent by the second demultiplexing module to obtain the single program audio and video stream. The live broadcast system for digital video high-definition video forwarding according to claim 5, wherein the routing device further comprises: And a stream server module, connected to the single program transport stream module, configured to send the single program audio and video stream to the smart terminal. The live broadcast system for digital video high-definition video forwarding according to claim 6, wherein the smart terminal comprises a user interface module, an interactive client module, and a multimedia play module; The user interface module is configured to generate the program play instruction according to a touch operation of the user; The interactive client module is configured to send the program play instruction to the routing device; The multimedia playing module is configured to decode the single program audio and video stream by using the video decoder, and play the decoded signal. The live broadcast system for digital video high-definition video forwarding according to claim 7, wherein the routing device further includes a first device discovery notification module; and correspondingly, the smart terminal further includes a second device discovery notification module; , The first device discovery notification module is configured to periodically send a Notify message to the outside world by using the fixed multicast address and the port before the smart terminal sends the program play instruction to the interaction server module; The second device discovery notification module is configured to analyze the Notify message after receiving the Notify message, and obtain an IP address and port information of the interaction server module accordingly. The live broadcast system for digital video high-definition video forwarding according to claim 8, wherein The user interface module is further configured to send, by using the interactive client module, a search command input by a user to the interaction server module; The interaction server module is further configured to: by using the second demultiplexing module, extract SI/PSI information corresponding to the search command from the descrambling signal data, to generate corresponding search progress information. And sending the search progress information to the interactive client module; The user interface module is further configured to acquire the search progress information sent by the interactive client module, and display the search progress information in real time. The live broadcast system for digital video high-definition video forwarding according to any one of claims 1 to 9, wherein the smart terminal is a smart mobile terminal or a smart TV; the data transmission channel is a WIFI channel or is built by a network cable. Transmission channel. A live broadcast method for digital TV high-definition video forwarding, characterized in that it comprises: Receiving a digital television signal input by a digital television coaxial cable, and performing descrambling processing on the digital television signal according to a descrambling command sent by the routing device to obtain corresponding descrambling signal data; Transmitting the descrambling signal data to the routing device, to perform signal extraction processing on the descrambled signal data by using the routing device, to obtain a corresponding single program audio and video stream, and provide data through the routing device. a transmission channel, sending the single program audio and video stream to the smart terminal; Decoding the single program audio and video stream by using a video decoder of the smart terminal, and playing the decoded signal; The descrambling command is a command generated by the routing device after receiving a program play instruction sent by the smart terminal.