CN109413491A - A kind of method and device of the descrambling audio, video data for reducing bandwidth - Google Patents
A kind of method and device of the descrambling audio, video data for reducing bandwidth Download PDFInfo
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- CN109413491A CN109413491A CN201811368155.5A CN201811368155A CN109413491A CN 109413491 A CN109413491 A CN 109413491A CN 201811368155 A CN201811368155 A CN 201811368155A CN 109413491 A CN109413491 A CN 109413491A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 241001269238 Data Species 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- VJTAZCKMHINUKO-UHFFFAOYSA-M chloro(2-methoxyethyl)mercury Chemical group [Cl-].COCC[Hg+] VJTAZCKMHINUKO-UHFFFAOYSA-M 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
-
- 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
- H04N21/439—Processing of audio elementary streams
-
- 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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4408—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
A kind of method that the embodiment of the present invention discloses descrambling audio, video data for reducing bandwidth, is related to descrambling technique field, this method comprises: receiving the selection instruction for being directed to target channel；From the TS flow data of target channel place frequency point, the audio, video data for the program that the target channel includes and the descrambling information for descrambling the audio, video data are obtained；The descrambling information includes the corresponding video PID of video data, the corresponding Audio PID of audio data in the audio, video data；The audio, video data and the descrambling information are sent to descrambling module；According to the descrambling audio, video data that the descrambling module returns, the program in the target channel is played.The bandwidth occupied when can reduce descrambling audio, video data in this way using Universal USB interface, to save most bandwidth resources for smart television.
Description
Technical field
The embodiment of the present invention is related to descrambling technique field more particularly to a kind of descrambling audio-video number for reducing bandwidth
According to method and device.
Background technique
Currently, the programme televised live played on smart television is typically all to need to add these by the scrambled signals of encryption
It disturbs signal data and carries out descrambling ability normal play program.
One of the relevant technologies descrambling scheme is: an external cutting ferrule is inserted by the smart card that will be used to descramble, after
The external cutting ferrule is connected with smart television, thus to descramble the scrambled signals data of smart television transmission.Descrambling scheme tool
Have the advantages that versatility is good.
Wherein, two classes can be divided by realizing that external cutting ferrule is connected with smart television in the descrambling scheme:
The first kind is to need to configure special card slot, which is the maximum interface of area occupied on smart television mainboard.In this way
When transmitting data between smart card and smart television, it is not necessarily to occupied bandwidth；But it is maximum due to needing to occupy area on mainboard
Interface, be unfavorable for using.
Second class is using USB interface general on smart television.Such second class descrambling scheme is configured due to not needing
Special interface, is widely used convenient for it；But due to using Universal USB interface that can occupy a part of bandwidth, to can cause
Smart television Caton.For example, especially for some bandwidth resources inherently seldom smart television, broadcast in smart television
Picture Caton phenomenon is had when putting high-definition program once in a while, when carrying out the operation such as menu, setting, voice command, also will appear card
?.
Further, after user selects one channel of viewing, smart television is first to frequency point frequency locking where the channel, then
Demodulation obtains the TS(Transport Stream of current frequency point, transport stream) flow data, the TS flow data is connect by USB later
Mouth, which is sent to descrambling module, to be descrambled, after the TS flow data after descrambling module returns to descrambling by USB interface, then after descrambling
TS flow data in select the data of the channel to play out；Wherein comprising owning in current frequency point in the TS data of current frequency point
The audio, video data of channel and other auxiliary datas.In this way, since the audio, video data of all channels in current frequency point is travelled to and fro between
Universal USB interface, undoubtedly further increases bandwidth occupancy.
Therefore, it is most important to reduce the bandwidth occupied in above-mentioned second class descrambling scheme using Universal USB interface, saving
Bandwidth can be used for executing the Premium Features such as MEMC function, HDR function, voice control in smart television.
Summary of the invention
The embodiment of the present invention provides a kind of method and device of descrambling audio, video data for reducing bandwidth, can subtract
The bandwidth occupied when descrambling audio, video data less using Universal USB interface.
In a first aspect, providing a kind of method of descrambling audio, video data for reducing bandwidth, which comprises
Receive the selection instruction for being directed to target channel；
From the TS flow data of target channel place frequency point, the audio, video data for the program that the target channel includes is obtained
And the descrambling information for descrambling the audio, video data；The descrambling information includes video data in the audio, video data
Corresponding video PID, the corresponding Audio PID of audio data；
The audio, video data and the descrambling information are sent to descrambling module；
According to the descrambling audio, video data that the descrambling module returns, the program in the target channel is played.
Second aspect, provides a kind of device of descrambling audio, video data for reducing bandwidth, and described device includes:
Receiving module, for receiving the selection instruction for being directed to target channel；
Module is obtained, for obtaining the section that the target channel includes from the TS flow data of target channel place frequency point
Purpose audio, video data and descrambling information for descrambling the audio, video data；The descrambling information includes the audio-video
The corresponding video PID of video data, the corresponding Audio PID of audio data in data；
Sending module, for sending the audio, video data and the descrambling information to descrambling module；
Playing module, the descrambling audio, video data for being returned according to the descrambling module, plays in the target channel
Program.
In above-mentioned example, after user selects one channel of viewing, where from the channel in the TS flow data of frequency point, only obtain
The audio, video data for the program for taking the channel to include and descrambling information for descrambling aforementioned audio, video data；Later by descrambling
Module descrambles according to audio, video data of the descrambling information to the channel；Smart television is according to the sound of the channel after descrambling
Video data plays out.In this way, only transmitting user's choosing by Universal USB interface due between smart television and smart card
The data for the channel selected, without transmitting the data of other channels in current frequency point in addition to the channel of user's selection, so energy
It is enough to reduce the bandwidth occupied using Universal USB interface, to save most bandwidth resources for smart television.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of schematic diagram of smart television；
Fig. 2 is a kind of method flow diagram for descrambling audio, video data；
Fig. 3 is a kind of method flow diagram of descrambling audio, video data for reducing bandwidth；
Fig. 4 is a kind of schematic device of descrambling audio, video data for reducing bandwidth.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is a kind of schematic diagram of smart television.As shown in Figure 1, the tuner of smart television receives broadcast singal (also referred to as
For TS stream) and broadcast singal is tuned, then demodulator demodulates the TS stream after tuning, and then demultiplexer will solve
Audio data, video data and the data portion different from audio/video part for including in TS stream after tune are divided
From the descrambling information that then descrambling module is sent according to controller descrambles aforementioned scrambled TS stream, later decoder pair
The TS stream of descrambling that descrambling module returns is decoded, so that display shows that decoded video data, loudspeaker play solution
Audio data after code.Here, data (such as audio, video data, solution are transmitted between the smart card in smart television and descrambling module
Disturb information) by Universal USB interface.
Wherein, the data portion that audio/video part is different from above-mentioned TS stream is rebuild to constitute program information table.Section
Mesh information table includes Program Association Table (Program Association Table, PAT), Program Map Table (Program Map
Table, PMT), network information table (Network Information Table, NIT), CAT Conditional Access Table (Conditional
Access Table, CAT), the information of the broadcast programs such as Event Information Table (Event Information Table, EIT).On
Descrambling information is stated to need to obtain and generate from PMT and CAT.
It should be noted that following is a brief introduction of the lower scrambling to TS stream and descrambling procedure:
It is as follows to the scrambling processes of TS stream: TS stream encryption being transmitted using scrambled control word (Control Word, CW).Here with
Control word transmission is relevant, and mainly there are two data informations: Entitlement Control Message (Entitlement Control Message,
) and Entitlement Management Message (Entitlment Management Message, EMM) ECM.Wherein, it transmits in ECM by business
The programs such as CW and programming source, time, classifying content and program price after key (Service Key, SK) encryption
Information；Transmission carries out at encryption by individual subscriber distribution key (Personal Distribute Key, PDK) in EMM
The SK of reason and address and authorized user message, the program that can be seen such as user or period, the license fee etc. that user pays.With
Family personal distribution key (PDK) is stored in the smart card of user.
To TS stream descrambling procedure by descrambling module (condition access module, CAM, also referred to as condition receiving
Block) it completes: smart television obtains the PID of ECM from the pmt table in the program information table of above-mentioned reconstruction, obtains from CAT table
The PID of EMM；Then ECM and EMM Data Concurrent is filtered out from TS stream to send into smart card.Smart card reads user first
People distributes key (PDK)；Then use PDK that EMM is decrypted to obtain SK；Then ECM is decrypted using SK
Processing is to obtain CW and CW is sent to descrambler；Descrambler can be descrambled scrambling TS stream using CW.
Here, smart television need from the PID of the PID of the ECM obtained in pmt table, the EMM obtained from CAT table and
Other information is combined into descrambling information and is sent to CAM, so that CAM descrambles scrambling TS stream.
Inventor's discovery: demultiplexer can be two here, be demultiplexer A and demultiplexer B respectively.It is selected in user
After selecting one channel of viewing, smart television first passes through tuner to frequency point frequency locking where the channel；Then it is demodulated by demodulator
Obtain the TS(Transport Stream of current frequency point, transport stream) flow data；Later as shown in Figure 2:
Step 11: demultiplexer A is by the TS of the audio, video data comprising all channels in current frequency point and other auxiliary datas
Stream Data Transmission gives buffer A0；
Step 12: buffer A0 sends data to buffer A1；
Step 13: data are transmitted to descrambling module by Universal USB interface by buffer A1；
Step 14: after descrambling module descrambles the audio, video data of the channel in data, by the sound of the channel after descrambling
The audio, video data of video data and other channels not descrambled returns to buffer B1 by USB interface；
Step 15: all data that buffer B1 returns to step 14 transfer to buffer B0；
Step 16: all data are back to demultiplexer B by buffer B0, so that demultiplexer B is by the audio-video number of the channel
According to subsequent decoding, broadcasting are carried out after filtering out again.
However, the code rate of complete TS flow data is generally 38Mbps all the way, and during the round-trip transmission of above-mentioned data, 6
The memory bandwidth that a step 12-16 occupies smart television is at least 6=228Mbps of 38Mbps *.
In above process, since the data for passing twice through the transmission of Universal USB interface are all channels in current frequency point
Audio, video data, and user watches a channel, it is only necessary to the audio, video data of the channel after getting descrambling.So in this reality
Apply in example, by the data that Universal USB interface transmits be only user selection channel audio, video data, can undoubtedly avoid using
Universal USB interface occupies excessive bandwidth.
Fig. 3 is a kind of method flow diagram of descrambling audio, video data for reducing bandwidth provided by the present application.Such as Fig. 3 institute
Show, this method comprises:
Step 21: user selects one channel of viewing, and smart television receives the selection instruction of the channel；
Step 22: by tuner to frequency point frequency locking where the channel；
Step 23: demodulating to obtain the TS(Transport Stream of current frequency point, transport stream by demodulator) flow data；
Step 24: demultiplexer A filters out audio, video data and the control for the program that the channel includes from the TS flow data
Device parses the descrambling information for descrambling the audio, video data；
Here, descrambling information includes at least: program number, the channel number of broadcasting；CA system ID, shows current TS
The CA system that flow data uses；ECM PID；Currently playing video ES information, such as video format, video data pair
The video bag mark (Packet Identifier, PID) answered；Currently playing audio ES information, such as audio lattice
The corresponding Audio PID of formula, audio data；Etc..
Step 25: the audio, video data that demultiplexer A filters out step 24 is transferred to buffer A0；
Step 26: above-mentioned audio, video data is transmitted to buffer A1 by buffer A0；
Step 27: above-mentioned audio, video data is transmitted to the descrambler of descrambling module by buffer A1 by Universal USB interface, and
Descrambling information is transmitted to the processor of descrambling module by controller by Universal USB interface；
Step 28: after descrambling module descrambles according to audio, video data of the descrambling information to the program that the channel includes, will solve
Audio, video data after disturbing returns to buffer B1 by USB interface；
Step 29: the audio, video data that buffer B1 returns to step 28 transfers to buffer B0；
Step 230: audio, video data is back to demultiplexer B by buffer B0, so that demultiplexer B directlys adopt buffer B0
The audio, video data of transmission, to carry out subsequent decoding, broadcasting.
It should be noted that above-mentioned buffer A0, A1 and buffer B0, B1 are for caching transmission, received data.
It should be noted that above-mentioned example is illustrated with two demultiplexers, and in specific implementation process, smart television
A demultiplexer can be set, be equivalent to the course of work for handling above-mentioned two demultiplexer.
Here, the number of channels that the TS stream packets of a general frequency point contain is 4 ~ 6, and the code rate of TS flow data is generally
The memory bandwidth that 38Mbps, aforementioned 6 step 25-230 occupy smart television is 38 ~ 57 Mbps, thus with method shown in Fig. 2
Compared to 171 ~ 190Mbps of bandwidth can be saved.Therefore Universal USB interface can be occupied using method provided in this embodiment
Bandwidth is reduced to 1/6 ~ 1/4 of method shown in Fig. 2.
So at demultiplexer A, just filtering out the sound view for the program that the channel that user selects includes in the present embodiment
Frequency evidence, so that is sent to descrambling module is only the sub-fraction in the TS flow data of current frequency point；Pass through Universal USB in this way
What interface transmitted is also only the sub-fraction in the TS flow data of current frequency point.It is connect in this way with method shown in Fig. 2 by Universal USB
The complete TS flow data of the current frequency point of port transmission is compared, and the memory bandwidth of smart television can be undoubtedly greatly reduced.
Based on same technical concept, Fig. 4 is a kind of descrambling audio, video data for reducing bandwidth provided by the present application
Schematic device.As shown in figure 4, the device includes:
Receiving module 31, for receiving user to the selection instruction of a channel；
Module 32 is obtained, for obtaining the audio-video for the program that the channel includes from the TS flow data of frequency point where the channel
Data and descrambling information for descrambling audio, video data；The descrambling information includes video data pair in aforementioned audio, video data
The corresponding Audio PID of video PID, audio data answered；
Sending module 33, for sending aforementioned audio, video data and descrambling information to descrambling module；
Playing module 34, the descrambling audio, video data for being returned according to descrambling module, plays the program in the channel.
Optionally, where above-mentioned TS flow data includes in frequency point the audio, video data of the corresponding program of all channels and
Descramble the descrambling information of the audio, video data of the corresponding program of all channels.
Optionally, which further includes the PID of the PID and empowerment management letter EMM of ECM.
Optionally, module 32 is obtained, is specifically used for: out of, PMT in above-mentioned TS flow data, it is corresponding to obtain video data
The PID of video PID, audio data corresponding Audio PID and ECM；Out of, CAT in above-mentioned TS flow data, the PID of EMM is obtained.
The specific implementation of device side can refer to above method side, and which is not described herein again.
It should be understood that in various embodiments of the present invention, magnitude of the sequence numbers of the above procedures are not meant to execute suitable
Sequence it is successive, the execution of each process sequence should be determined by its function and internal logic, the implementation without coping with the embodiment of the present invention
Process constitutes any restriction.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (8)
1. a kind of method of the descrambling audio, video data for reducing bandwidth, which is characterized in that the described method includes:
Receive the selection instruction for being directed to target channel；
From the TS flow data of target channel place frequency point, the audio, video data for the program that the target channel includes is obtained
And the descrambling information for descrambling the audio, video data；The descrambling information includes video data in the audio, video data
Corresponding video PID, the corresponding Audio PID of audio data；
The audio, video data and the descrambling information are sent to descrambling module；
According to the descrambling audio, video data that the descrambling module returns, the program in the target channel is played.
2. method described in claim 1, which is characterized in that the TS flow data include in the frequency point all channels it is corresponding
The descrambling information of the audio, video data of the audio, video data of program and the corresponding program of descrambling all channels.
3. the method as described in claim 1, which is characterized in that the descrambling information further includes the PID of Entitlement Control Message ECM
With the PID of Entitlement Management Message EMM.
4. method as claimed in claim 3, which is characterized in that out of, Program Map Table in the TS flow data, obtain institute
State the PID of the corresponding video PID of video data, audio data corresponding Audio PID and the ECM；From the TS flow data
CAT Conditional Access Table in, obtain the PID of the EMM.
5. a kind of descrambler for reducing bandwidth, which is characterized in that described device includes:
Receiving module, for receiving the selection instruction for being directed to target channel；
Module is obtained, for obtaining the section that the target channel includes from the TS flow data of target channel place frequency point
Purpose audio, video data and descrambling information for descrambling the audio, video data；The descrambling information includes the audio-video
The corresponding video PID of video data, the corresponding Audio PID of audio data in data；
Sending module, for sending the audio, video data and the descrambling information to descrambling module；
Playing module, the descrambling audio, video data for being returned according to the descrambling module, plays in the target channel
Program.
6. device as claimed in claim 5, which is characterized in that the TS flow data includes all channels correspondences in the frequency point
Program audio, video data and the corresponding program of descrambling all channels audio, video data descrambling information.
7. device as claimed in claim 5, which is characterized in that the descrambling information further includes the PID of Entitlement Control Message ECM
With the PID of Entitlement Management Message EMM.
8. device as claimed in claim 7, which is characterized in that the acquisition module is specifically used for: from the TS flow data
Program Map Table in, obtain the corresponding video PID of the video data, the corresponding Audio PID of audio data and the ECM
PID；Out of, CAT Conditional Access Table in the TS flow data, the PID of the EMM is obtained.
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| CN201811368155.5A CN109413491A (en) | 2018-11-16 | 2018-11-16 | A kind of method and device of the descrambling audio, video data for reducing bandwidth |
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Application publication date: 20190301 |