CN106604108B - Digital television disaster early warning method and device - Google Patents
Digital television disaster early warning method and device Download PDFInfo
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- CN106604108B CN106604108B CN201611270908.XA CN201611270908A CN106604108B CN 106604108 B CN106604108 B CN 106604108B CN 201611270908 A CN201611270908 A CN 201611270908A CN 106604108 B CN106604108 B CN 106604108B
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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
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
- H04N21/4314—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations for fitting data in a restricted space on the screen, e.g. EPG data in a rectangular grid
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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
- H04N21/47—End-user applications
- H04N21/488—Data services, e.g. news ticker
- H04N21/4882—Data services, e.g. news ticker for displaying messages, e.g. warnings, reminders
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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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8126—Monomedia components thereof involving additional data, e.g. news, sports, stocks, weather forecasts
Abstract
The invention discloses a digital television disaster early warning method, which comprises the following steps: receiving a television program transport stream transmitted by an information transmitting terminal; extracting a corresponding program number and a disaster early warning caption from the television program transport stream; and acquiring a program picture according to the program number, embedding the disaster early warning caption in the program picture, and displaying the program picture embedded with the disaster early warning caption in a display interface. The invention also discloses a device for early warning the digital television disaster. The invention receives the television program transport stream sent by the information sending terminal, extracts the corresponding program number and the disaster early warning caption from the television program transport stream, acquires the program picture according to the program number, embeds the disaster early warning caption in the program picture, displays the program picture embedded with the disaster early warning caption in the display interface, does not need the information sending terminal to decode the program, adds the information, then encodes and outputs the information to the user, and can carry out early warning prompt in time.
Description
Technical Field
The invention relates to the technical field of televisions, in particular to a digital television disaster early warning method and device.
Background
Natural disasters such as earthquake, flood, typhoon and the like can cause great influence on lives and properties of people. Although the forecast of natural disasters is difficult, early warning at the time of disaster occurrence is feasible. Taking an earthquake as an example, at the moment of arrival of the earthquake, since the propagation velocity of the earthquake wave is far shorter than that of the radio wave (the distance is 3.5 km, the arrival time of the earthquake wave is about 1 second), the earthquake bureau often has tens of seconds after detecting the earthquake to notify people. Although it is a short time of tens of seconds, it is possible to save the lives of millions of people in the presence of a major earthquake.
There are many earthquake early warning methods, such as mobile phone early warning, broadcast early warning, television early warning, etc. As the television is arranged in a common family, if the television can alarm actively when an earthquake happens, more escape time can be won for the family, and the life of the family can be saved.
In the past, the television earthquake early warning is usually implemented by decoding a program at a television signal relay station/operator, adding information, encoding and outputting the program to a user. The disadvantage of this is that adding information to the video requires consuming resources of the relay station/operator and consuming a certain time, and the user has a certain delay in decoding and playing after receiving the video, which results in untimely warning.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a digital television disaster early warning method and device, and aims to solve the technical problem that early warning is not timely in the prior art.
In order to achieve the above object, the present invention provides a method for digital television disaster warning, which comprises the following steps:
receiving a television program transport stream transmitted by an information transmitting terminal;
extracting a corresponding program number and a disaster early warning caption from the television program transport stream;
and acquiring a program picture according to the program number, embedding the disaster early warning caption in the program picture, and displaying the program picture embedded with the disaster early warning caption in a display interface.
Preferably, the extracting the corresponding program number and the disaster warning subtitle from the television program transport stream specifically includes:
extracting a corresponding program number, a channel number of an early warning program and a disaster early warning caption from the television program transport stream;
the acquiring a program picture according to the program number, embedding the disaster early warning caption in the program picture, and displaying the program picture after embedding the disaster early warning caption in a display interface specifically comprises:
embedding a program switching prompt window and the disaster early warning caption in the program picture, and displaying the program picture embedded with the program switching prompt window and the disaster early warning caption in a display interface;
after acquiring a program picture according to the program number, embedding the disaster early warning caption in the program picture, and displaying the program picture embedded with the disaster early warning caption in a display interface, the method further comprises:
and when a switching instruction input by a user is detected, switching the content displayed in the display interface into the picture of the early warning program according to the channel number of the early warning program.
Preferably, the map layer to which the disaster warning subtitle belongs is the uppermost layer of the program picture.
Preferably, when a switching instruction input by a user is detected, switching the content displayed in the display interface to the picture of the early warning program according to the channel number of the early warning program specifically includes:
when a switching instruction input by a user is detected, acquiring the picture of the early warning program according to the channel number of the early warning program, embedding the disaster early warning caption into the picture of the early warning program, and switching the content displayed in a display interface into the picture of the early warning program embedded behind the disaster early warning caption.
Preferably, before receiving the television program transport stream transmitted by the information transmitting end, the method further includes:
receiving system information sent by the information sending end;
extracting a disaster early warning identifier from the system information;
and when the disaster early warning identification is a preset identification, acquiring a current operation state, playing an early warning prompt tone when the current operation state is a power-on state, and starting and playing the early warning prompt tone when the current operation state is a standby state.
In addition, in order to achieve the above object, the present invention further provides a digital television disaster warning device, wherein the device comprises:
the transport stream receiving module is used for receiving the television program transport stream sent by the information sending end;
the data extraction module is used for extracting a corresponding program number and a disaster early warning caption from the television program transport stream;
and the information display module is used for acquiring a program picture according to the program number, embedding the disaster early warning caption in the program picture and displaying the program picture embedded with the disaster early warning caption in a display interface.
Preferably, the data extraction module is further configured to extract a corresponding program number, a channel number of an early warning program, and a disaster early warning subtitle from the television program transport stream;
correspondingly, the information display module is further configured to embed a program switching prompt window and the disaster early warning subtitle in the program picture, and display the program picture after the program switching prompt window and the disaster early warning subtitle are embedded in a display interface;
the device further comprises:
and the content switching module is used for switching the content displayed in the display interface into the picture of the early warning program according to the channel number of the early warning program when a switching instruction input by a user is detected.
Preferably, the map layer to which the disaster warning subtitle belongs is the uppermost layer of the program picture.
Preferably, the content switching module is further configured to, when a switching instruction input by a user is detected, obtain a picture of the early warning program according to the channel number of the early warning program, embed the disaster early warning subtitle in the picture of the early warning program, and switch the content displayed in the display interface to the picture of the early warning program embedded behind the disaster early warning subtitle.
Preferably, the apparatus further comprises:
the information receiving module is used for receiving the system information sent by the information sending end;
the identification extraction module is used for extracting the disaster early warning identification from the system information;
and the early warning prompting module is used for acquiring the current running state when the disaster early warning identifier is a preset identifier, playing an early warning prompting tone when the current running state is a power-on state, and starting up and playing the early warning prompting tone when the current running state is a standby state.
The invention receives the television program transport stream sent by the information sending end, extracts the corresponding program number and the disaster early warning caption from the television program transport stream, acquires the program picture according to the program number, embeds the disaster early warning caption in the program picture, displays the program picture embedded with the disaster early warning caption in the display interface, does not need the information sending end to decode the program, adds information, encodes and outputs the information to the user, and can carry out early warning prompt in time.
Drawings
Fig. 1 is a schematic flow chart of a digital television disaster warning method according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating a second embodiment of a digital television disaster warning method according to the present invention;
fig. 3 is a flowchart illustrating a digital tv disaster warning method according to a third embodiment of the present invention;
FIG. 4 is a functional block diagram of a digital television disaster warning device according to a first embodiment of the present invention;
FIG. 5 is a functional block diagram of a digital television disaster warning device according to a second embodiment of the present invention;
fig. 6 is a functional block diagram of a digital tv disaster warning device according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a first embodiment of the present invention provides a method for digital television disaster warning, where the method includes:
s10: receiving a television program transport stream transmitted by an information transmitting terminal;
it should be noted that the main execution body of the method of the present embodiment is a controller of a digital television.
It is understood that the information sending end is a digital television transmission relay station or an operator server, and of course, other devices with similar functions may also be used, which is not limited in this embodiment.
In a specific implementation, the television program transport stream (TS stream) has a program map table PMT table, a descriptor including a disaster warning subtitle may be added to the program map table, and when a warning prompt is required for a disaster, the descriptor is added to the PMT.
S20: extracting a corresponding program number and a disaster early warning caption from the television program transport stream;
it should be noted that the television program transport stream carries a program number and a descriptor, and a disaster warning subtitle, and the corresponding program number and descriptor can be extracted from the television program transport stream, and the disaster warning subtitle is extracted from the descriptor.
S30: and acquiring a program picture according to the program number, embedding the disaster early warning caption in the program picture, and displaying the program picture embedded with the disaster early warning caption in a display interface.
The embodiment receives a television program transport stream sent by an information sending end, extracts a corresponding program number and a disaster early warning caption from the television program transport stream, acquires a program picture according to the program number, embeds the disaster early warning caption in the program picture, displays the program picture embedded with the disaster early warning caption in a display interface, does not need the information sending end to decode the program, adds information, encodes and outputs the information to a user, and can timely carry out early warning reminding.
Referring to fig. 2, fig. 2 is a schematic flow chart of a digital television disaster warning method according to a second embodiment of the present invention, and the digital television disaster warning method according to the second embodiment of the present invention is proposed based on the embodiment shown in fig. 1.
In this embodiment, S20 specifically includes:
s20': extracting a corresponding program number, a channel number of an early warning program and a disaster early warning caption from the television program transport stream;
assuming that the descriptor added to the PMT table of the TS stream is disaster _ array _ descriptor, the following description will illustrate the present invention by taking a specific descriptor as an example, but not limit the scope of the present invention.
The descriptor disaster _ alarm _ descriptor may have a structure as follows:
the above parameters have the meanings as follows:
descriptor _ tag: and the identifier of the disaster _ alarm _ descriptor is fixed to 0 xCF.
descriptor _ length: length of this descriptor.
start _ end _ flag: whether the descriptor is valid. 1: the method is effective; 0: and (4) invalidation.
signal _ type: the kind of disaster. 000: earthquake, 001: typhoon, 010: tsunami, 011: flood, 100: rainstorm, 101: snowstorm, 110: hail, 111: and (5) reserving.
reserved _ future _ use: the bit is reserved.
service _ id: if the early warning program exists, the service _ id is the channel number of the program; if there is no disaster warning program, fix to 0 xFFFF.
super _ capture _ length: the length of the disaster warning caption.
surper _ capture: and disaster warning subtitle content.
It can be understood that when a disaster occurs and needs warning prompt, the start _ end _ flag can be set to 1, and the super _ capture _ length can be set to a value other than 0.
Correspondingly, the step S30 specifically includes:
s30': embedding a program switching prompt window and the disaster early warning caption in the program picture, and displaying the program picture embedded with the program switching prompt window and the disaster early warning caption in a display interface;
it can be understood that, in order to prevent the program switching prompt window from shielding the disaster warning subtitle, in this embodiment, the layer to which the disaster warning subtitle belongs may be set as the uppermost layer of the program information.
After the step S30, the method further includes:
s40: and when a switching instruction input by a user is detected, switching the content displayed in the display interface into the picture of the early warning program according to the channel number of the early warning program.
In a specific implementation, in order to ensure that the disaster warning subtitle is also displayed in the picture of the warning program, in this embodiment, when a switching instruction input by a user is detected, the picture of the warning program may be obtained according to a channel number of the warning program, the disaster warning subtitle is embedded in the picture of the warning program, and the content displayed in a display interface is switched to the picture of the warning program embedded behind the disaster warning subtitle.
After the first time of notification to the user, the channel can be switched to the early warning program to provide richer refuge prompts.
Referring to fig. 3, fig. 3 is a schematic flow chart of a digital television disaster warning method according to a third embodiment of the present invention, which is proposed based on the embodiment shown in fig. 1 or 2, and fig. 3 is an example based on the embodiment shown in fig. 1.
In this embodiment, before step S10, the method further includes:
s01: receiving system information sent by the information sending end;
it can be understood that the information sending end may send the system information by using a wireless transmission mode, or may send the system information by using a wired transmission mode.
In a specific implementation, a frame structure, channel coding and modulation (DTMB) wireless transmission mode of a Digital Television Terrestrial Broadcasting transmission system may be used, and the definition of system information in the DTMB wireless transmission mode is as follows:
| bits | Meaning in the Specification | New definitions |
| S0～S3 | Coded modulation mode | Coded modulation mode |
| S4 | Interleaving information | Interleaving information |
| S5 | Retention | Disaster early warning position |
Since the 5 th bit (S5) of the system information is a reserved bit, it may be set as a disaster warning bit in which a disaster warning flag is stored, and when the disaster warning flag is 0, the disaster warning does not occur, and when the disaster warning flag is 1, the disaster warning occurs.
In a specific implementation, a DVB-C cable transmission mode can be used, and at this time, EARLYWARNING SYSTEM bits in the DVB-C can be reused as a disaster warning bit, a disaster warning identifier is stored in the disaster warning bit, when the disaster warning identifier is 0, disaster warning does not occur, and when the disaster warning identifier is 1, disaster warning occurs.
S02: extracting a disaster early warning identifier from the system information;
it is understood that the disaster identification bits can be extracted from the system information upon receipt of the system information.
S03: and when the disaster early warning identification is a preset identification, acquiring a current operation state, playing an early warning prompt tone when the current operation state is a power-on state, and starting and playing the early warning prompt tone when the current operation state is a standby state.
It can be understood that the warning prompt tone may be a disaster warning tone of a predetermined value, or may be a sound of a buzzer, and of course, other prompt tones may also be used, which is not limited in this embodiment.
In a specific implementation, when the disaster warning flag is 1, a disaster warning is determined to occur, a current operation state is obtained, when the current operation state is a power-on state, a warning prompt tone is played, and when the current operation state is a standby state, the power-on state is started and a warning prompt tone is played.
In the prior art, the television in the standby state cannot respond to the disaster warning, but the embodiment can solve the problem that the television in the standby state cannot notify the disaster warning.
Referring to fig. 4, a first embodiment of the present invention provides an apparatus for digital tv disaster warning, including:
a transport stream receiving module 10, configured to receive a television program transport stream sent by an information sending end;
it should be noted that the apparatus of the present embodiment is disposed in a controller of a digital television.
It is understood that the information sending end is a digital television transmission relay station or an operator server, and of course, other devices with similar functions may also be used, which is not limited in this embodiment.
In a specific implementation, the television program transport stream (TS stream) has a program map table PMT table, a descriptor including a disaster warning subtitle may be added to the program map table, and when a warning prompt is required for a disaster, the descriptor is added to the PMT.
A data extraction module 20, configured to extract a corresponding program number and a disaster warning subtitle from the television program transport stream;
it should be noted that the television program transport stream carries a program number and a descriptor, and a disaster warning subtitle, and the corresponding program number and descriptor can be extracted from the television program transport stream, and the disaster warning subtitle is extracted from the descriptor.
And the information display module 30 is configured to obtain a program picture according to the program number, embed the disaster warning subtitle in the program picture, and display the program picture after the disaster warning subtitle is embedded in the program picture in a display interface.
The embodiment receives a television program transport stream sent by an information sending end, extracts a corresponding program number and a disaster early warning caption from the television program transport stream, acquires a program picture according to the program number, embeds the disaster early warning caption in the program picture, displays the program picture embedded with the disaster early warning caption in a display interface, does not need the information sending end to decode the program, adds information, encodes and outputs the information to a user, and can timely carry out early warning reminding.
Referring to fig. 5, fig. 5 is a functional block diagram of a digital television disaster warning device according to a second embodiment of the present invention, and a second embodiment of the digital television disaster warning device according to the present invention is proposed based on the embodiment shown in fig. 4.
In this embodiment, the data extracting module 20' is further configured to extract a corresponding program number, a channel number of an early warning program, and a disaster early warning subtitle from the television program transport stream;
assuming that the descriptor added to the PMT table of the TS stream is disaster _ array _ descriptor, the following description will illustrate the present invention by taking a specific descriptor as an example, but not limit the scope of the present invention.
The descriptor disaster _ alarm _ descriptor may have a structure as follows:
the above parameters have the meanings as follows:
descriptor _ tag: and the identifier of the disaster _ alarm _ descriptor is fixed to 0 xCF.
descriptor _ length: length of this descriptor.
start _ end _ flag: whether the descriptor is valid. 1: the method is effective; 0: and (4) invalidation.
signal _ type: the kind of disaster. 000: earthquake, 001: typhoon, 010: tsunami, 011: flood, 100: rainstorm, 101: snowstorm, 110: hail, 111: and (5) reserving.
reserved _ future _ use: the bit is reserved.
service _ id: if the early warning program exists, the service _ id is the channel number of the program; if there is no disaster warning program, fix to 0 xFFFF.
super _ capture _ length: the length of the disaster warning caption.
surper _ capture: and disaster warning subtitle content.
It can be understood that when a disaster occurs and needs warning prompt, the start _ end _ flag can be set to 1, and the super _ capture _ length can be set to a value other than 0.
Correspondingly, the information display module 30' is further configured to embed a program switching prompt window and the disaster warning subtitle in the program picture, and display the program picture after the program switching prompt window and the disaster warning subtitle are embedded in a display interface;
it can be understood that, in order to prevent the program switching prompt window from shielding the disaster warning subtitle, in this embodiment, the layer to which the disaster warning subtitle belongs may be set as the uppermost layer of the program information.
The device further comprises:
and the content switching module 40 is configured to switch the content displayed in the display interface to the picture of the early warning program according to the channel number of the early warning program when a switching instruction input by the user is detected.
In a specific implementation, in order to ensure that the disaster warning subtitle is also displayed in the picture of the warning program, in this embodiment, when a switching instruction input by a user is detected, the picture of the warning program may be obtained according to a channel number of the warning program, the disaster warning subtitle is embedded in the picture of the warning program, and the content displayed in a display interface is switched to the picture of the warning program embedded behind the disaster warning subtitle.
After the first time of notification to the user, the channel can be switched to the early warning program to provide richer refuge prompts.
Referring to fig. 6, fig. 6 is a functional block diagram of a digital tv disaster warning apparatus according to a third embodiment of the present invention, which is proposed based on the embodiments shown in fig. 4 or 5, and fig. 6 illustrates the embodiment shown in fig. 4.
In this embodiment, the apparatus further includes:
the information receiving module 01 is used for receiving the system information sent by the information sending end;
it can be understood that the information sending end may send the system information by using a wireless transmission mode, or may send the system information by using a wired transmission mode.
In a specific implementation, a frame structure, channel coding and modulation (DTMB) wireless transmission mode of a Digital Television Terrestrial Broadcasting transmission system may be used, and the definition of system information in the DTMB wireless transmission mode is as follows:
| bits | Meaning in the Specification | New definitions |
| S0～S3 | Coded modulation mode | Coded modulation mode |
| S4 | Interleaving information | Interleaving information |
| S5 | Retention | Disaster early warning position |
Since the 5 th bit (S5) of the system information is a reserved bit, it may be set as a disaster warning bit in which a disaster warning flag is stored, and when the disaster warning flag is 0, the disaster warning does not occur, and when the disaster warning flag is 1, the disaster warning occurs.
In a specific implementation, a DVB-C cable transmission mode can be used, and at this time, EARLYWARNING SYSTEM bits in the DVB-C can be reused as a disaster warning bit, a disaster warning identifier is stored in the disaster warning bit, when the disaster warning identifier is 0, disaster warning does not occur, and when the disaster warning identifier is 1, disaster warning occurs.
The identification extraction module 02 is used for extracting the disaster early warning identification from the system information;
it is understood that the disaster identification bits can be extracted from the system information upon receipt of the system information.
The early warning prompting module 03 is configured to acquire a current operation state when the disaster early warning identifier is a preset identifier, play an early warning prompting tone when the current operation state is a power-on state, and power on and play an early warning prompting tone when the current operation state is a standby state.
It can be understood that the warning prompt tone may be a disaster warning tone of a predetermined value, or may be a sound of a buzzer, and of course, other prompt tones may also be used, which is not limited in this embodiment.
In a specific implementation, when the disaster warning flag is 1, a disaster warning is determined to occur, a current operation state is obtained, when the current operation state is a power-on state, a warning prompt tone is played, and when the current operation state is a standby state, the power-on state is started and a warning prompt tone is played.
In the prior art, the television in the standby state cannot respond to the disaster warning, but the embodiment can solve the problem that the television in the standby state cannot notify the disaster warning.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A method for disaster warning of a digital television, the method comprising the steps of:
receiving a television program transport stream transmitted by an information transmitting terminal;
extracting a corresponding program number, a channel number of an early warning program and a disaster early warning caption from the television program transport stream;
embedding a program switching prompt window and the disaster early warning caption in the program picture, and displaying the program picture embedded with the program switching prompt window and the disaster early warning caption in a display interface;
when a switching instruction input by a user is detected, acquiring a picture of the early warning program according to the channel number of the early warning program, embedding the disaster early warning caption into the picture of the early warning program, and switching the content displayed in a display interface into the picture of the early warning program embedded behind the disaster early warning caption;
before receiving the television program transport stream sent by the information sending end, the method further includes:
receiving system information sent by the information sending end;
extracting a disaster early warning identifier from the system information;
and when the disaster early warning identification is a preset identification, acquiring a current operation state, playing an early warning prompt tone when the current operation state is a power-on state, and starting and playing the early warning prompt tone when the current operation state is a standby state.
2. The method of claim 1, wherein the image layer to which the disaster warning subtitle belongs is an uppermost layer of the program picture.
3. A digital television disaster warning device, comprising:
the transport stream receiving module is used for receiving the television program transport stream sent by the information sending end;
the data extraction module is used for extracting a corresponding program number and a disaster early warning caption from the television program transport stream;
the information display module is used for acquiring a program picture according to the program number, embedding the disaster early warning caption in the program picture and displaying the program picture embedded with the disaster early warning caption in a display interface;
wherein the apparatus further comprises:
the information receiving module is used for receiving the system information sent by the information sending end;
the identification extraction module is used for extracting the disaster early warning identification from the system information;
the early warning prompting module is used for acquiring a current operation state when the disaster early warning identifier is a preset identifier, playing an early warning prompting tone when the current operation state is a starting state, and starting and playing the early warning prompting tone when the current operation state is a standby state;
the data extraction module is further used for extracting corresponding program numbers, channel numbers of early warning programs and disaster early warning subtitles from the television program transport stream;
correspondingly, the information display module is further configured to embed a program switching prompt window and the disaster early warning subtitle in the program picture, and display the program picture after the program switching prompt window and the disaster early warning subtitle are embedded in a display interface;
the device further comprises:
the content switching module is used for switching the content displayed in the display interface into the picture of the early warning program according to the channel number of the early warning program when a switching instruction input by a user is detected;
the content switching module is further configured to, when a switching instruction input by a user is detected, obtain a picture of the early warning program according to the channel number of the early warning program, embed the disaster early warning subtitle into the picture of the early warning program, and switch content displayed in a display interface to the picture of the early warning program after the disaster early warning subtitle is embedded.
4. The apparatus of claim 3, wherein the map layer to which the disaster warning subtitle belongs is an uppermost layer of the program picture.
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