CN104811804B - Video on demand information acquisition method and system - Google Patents
Video on demand information acquisition method and system Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of video on demand information acquisition method and systems, and network information table is obtained from digital television signal stream；It detects and the first linkage descriptor whether is carried in the network information table, the first video on demand information is carried in first linkage descriptor；The first video on demand information includes：First frequency point information and IP address information；Wherein, first frequency point information includes：First frequency, the first modulation system and the first symbol rate；The IP address information includes：The version of IP address, the homepage IP address of sub-headend portal, the homepage port numbers of sub-headend portal；When detecting the first linkage descriptor, the first video on demand information is parsed from first linkage descriptor；The first video on demand information is stored into flash memory.When needing demand TV program, sub-headend portal is accessed according to the IP address stored in flash memory, so as to fulfill the video on-demand function based on distributed portal site server.
Description
Technical field
The present invention relates to digital TV technology, more specifically to a kind of video on demand information acquisition method and
System.
Background technology
As the integration of three networks promotes, digital television interaction has become the Main way of radio, TV and film industries development, passes through interaction
DTV, people with program request when people are by digital television interaction request program are accessed extensively by top box of digital machine
The portal site server of electric operator is realized.
And as digital cable customers amount increasingly increases severely, the visit capacity of the portal site server of radio and TV operator also with
Increase severely, a portal site server cannot meet the needs of people, can not reach the peak efficiency of program distribution.In
It is that distributed portal site server becomes the first choice of vod server, is overloaded to avoid single portal server, so as to ensure
The experience effect of smooth play quality and DTV is provided, then just generates the portal site server of various regions operator
（For ease of distinguishing, the portal site server of various regions operator is known as sub-headend portal below）.
Based on this, the set-top box of various regions needs a kind of method to obtain the IP address port numbers of local sub-headend portal
The required video on demand information when request programs, to realize the video on demand work(based on distributed portal site server
Energy.
Invention content
The object of the present invention is to provide a kind of video on demand information acquisition method and system, to realize based on distributed portal
The video on-demand function of Website server.
To achieve the above object, the present invention provides following technical solutions：
A kind of video on demand information acquisition method, applied to top box of digital machine, the method includes：
Obtain the network information table in digital television signal stream；
It detects and the first linkage descriptor whether is carried in the network information table, carried in first linkage descriptor
There is the first video on demand information；The first video on demand information includes：First frequency point information and IP address information；Wherein, institute
The first frequency point information is stated to include：First frequency, the first modulation system and the first symbol rate；The IP address information includes：IP
The version of location, the homepage IP addresses of sub-headend portal, the homepage port numbers of sub-headend portal；
When detecting the first linkage descriptor, the first video on demand letter is parsed from first linkage descriptor
Breath；
The first video on demand information is stored into flash memory.
The above method, it is preferred that the IP address information further includes：
The time shift IP address of sub-headend portal and the time shift port numbers of sub-headend portal.
The above method, it is preferred that further include：
It detects and the second linkage descriptor whether is carried in the network information table, carried in second linkage descriptor
There is the second video on demand information；The second video on demand information includes the second frequency point information, and second frequency point information includes：
Second frequency, the second modulation system and the second symbol rate；
When detecting the second linkage descriptor, the second video on demand letter is parsed from second linkage descriptor
Breath, determines the second frequency point；
By the working frequency of the top box of digital machine be tuned to second frequency point；
Transmission code stream is received from second frequency point；
Judge whether that transmission code stream mark can be parsed from the transmission code stream that second frequency point receives, and will sentence
Disconnected result is stored into flash memory；
The judging result is used to select the reception mode of institute's order video.
The above method, it is preferred that further include：
When user's request program, if the judging result is can be from the transmission code stream that second frequency point receives
Transmission code stream mark is parsed, and the transmission code stream ident value is not default ident value, then IP-QAM modes is selected to receive use
The video of family institute program request；If the judging result is cannot parse biography from the transmission code stream that second frequency point receives
Defeated code stream identification can parse transmission code stream mark, and described from the transmission code stream that second frequency point receives
Transmission code stream ident value is default ident value, then IP modes is selected to receive the video of user institute program request.
The above method, it is preferred that the IP address information further includes：
The reserved port numbers of the reserved IP address of sub-headend portal and the sub-headend portal.
A kind of video on demand Information Acquisition System, applied to top box of digital machine, including：
Acquisition module, for obtaining the network information table in digital television signal stream；
First detection module, for detecting the first linkage descriptor whether is carried in the network information table, described
The first video on demand information is carried in one linkage descriptor；The first video on demand information includes：First frequency point information and
IP address information；Wherein, first frequency point information includes：First frequency, the first modulation system and the first symbol rate；The IP
Address information includes：The version of IP address, the homepage IP address of sub-headend portal, the homepage port numbers of sub-headend portal；
First parsing module, for when detecting the first linkage descriptor, being parsed from first linkage descriptor
Go out the first video on demand information；
Memory module, for storing the first video on demand information into flash memory.
Above system, it is preferred that the IP address information further includes：
The time shift IP address of sub-headend portal and the time shift port numbers of sub-headend portal.
Above system, it is preferred that further include：
Second detection module, for detecting the second linkage descriptor whether is carried in the network information table, described
The second video on demand information is carried in two linkage descriptors；The second video on demand information includes the second frequency point information, institute
The second frequency point information is stated to include：Second frequency, the second modulation system and the second symbol rate；
Second parsing module, for when detecting the second linkage descriptor, being parsed from second linkage descriptor
Go out the second video on demand information, determine the second frequency point；
Tuner module, for by the working frequency of the top box of digital machine be tuned to second frequency point；
Receiving module, for receiving transmission code stream from second frequency point；
Judgment module, for judging whether that transmission code can be parsed from the transmission code stream that second frequency point receives
The mark of stream, and will determine that result is stored into flash memory；The judging result is used to select the transmission mode of institute's order video.
Above system, it is preferred that further include：
Reception mode selecting module, for when user's request program, if the judging result is can be from described second
Transmission code stream is parsed in the transmission code stream that frequency point receives, and the transmission code stream ident value is not default ident value, then selects
Select the video that IP-QAM modes transmit the program request of user institute；If the judging result is cannot the biography that receives of second frequency point
Transmission code stream mark is parsed in defeated code stream or transmission can be parsed from the transmission code stream that second frequency point receives
Code stream identification, and the transmission code stream ident value is default ident value, then IP modes is selected to transmit the video of user institute program request.
Above system, it is preferred that state IP address information and further include：
The reserved port numbers of the reserved IP address of sub-headend portal and the sub-headend portal.
By above scheme it is found that the application provide a kind of video on demand information acquisition method and system, by video point
It broadcasts information and is converted to the first linkage descriptor, top box of digital machine is then transferred to by network information table, top box of digital machine is from number
Network information table is obtained in word television signal flow；It detects and the first linkage descriptor whether is carried in the network information table, institute
It states and the first video on demand information is carried in the first linkage descriptor；The first video on demand information includes：First frequency point is believed
Breath and IP address information；Wherein, first frequency point information includes：First frequency, the first modulation system and the first symbol rate；Institute
IP address information is stated to include：The version of IP address, the homepage IP address of sub-headend portal, the homepage port numbers of sub-headend portal；
When detecting the first linkage descriptor, the first video on demand information is parsed from first linkage descriptor；By described in
First video on demand information is stored into flash memory.When needing demand TV program, accessed according to the IP address stored in flash memory
Sub-headend portal, so as to fulfill the video on-demand function based on distributed portal site server.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of flow chart of video on demand information acquisition method provided by the embodiments of the present application；
Fig. 2 is the flow chart of another video on demand information acquisition method provided by the embodiments of the present application；
Fig. 3 is a kind of structure diagram of video on demand Information Acquisition System provided by the embodiments of the present application；
Fig. 4 is the structure diagram of another video on demand Information Acquisition System provided by the embodiments of the present application；
Fig. 5 is the structure diagram of another video on demand Information Acquisition System provided by the embodiments of the present application.
Term " first ", " second ", " third " " the 4th " in specification and claims and above-mentioned attached drawing etc.（If
In the presence of）It is the part for distinguishing similar, specific sequence or precedence is described without being used for.It should be appreciated that it uses in this way
Data can be interchanged in the appropriate case, so that embodiments herein described herein can be in addition to illustrating herein
Sequence in addition is implemented.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is a kind of flow chart of video on demand information acquisition method provided by the embodiments of the present application, this
The video on demand information acquisition method that application provides is applied to top box of digital machine, may include steps of：
Step S11：Obtain the network information table in digital television signal stream；
Network information table（Network Information Table, NIT）It is that digital television system is used for transmission network letter
One table of breath, most important purposes is that set-top box can be searched for automatically when no program powers on or when program changes
All TV programme gone out in network are come.
Step S12：It detects and the first linkage descriptor whether is carried in the network information table, the first link description
The first video on demand information is carried in symbol；The first video on demand information includes：First frequency point information and IP address information；
Wherein, first frequency point information includes：First frequency, the first modulation system and the first symbol rate；The IP address packet
It includes：The version of IP address, the homepage IP address of sub-headend portal, the homepage port numbers of sub-headend portal；
In the embodiment of the present application, the IP address information and frequency point information of sub-headend are converted into the first chained list descriptor, by
Various regions operator is added in network information table, is transferred to set-top box.
It, can be in network information table in order to facilitate judging the first linkage descriptor whether is carried in network information table
Linkage descriptors are predefined, and the first linkage descriptor can be such as represented with 0xA1, i.e., ought be detected in network information table
Linkage descriptors be 0xA1 when, illustrate to carry the first linkage descriptor in network information table.
Specifically, the particular content of the first link description can be turned by the IP address information and frequency point information of sub-headend
The hexadecimal number sequence of one several is changed to represent.For example, first linkage descriptor provided by the embodiments of the present application
Example as shown in First ray, the First ray is：
00075AD00300001ADB04AC1E03200050AC1E03640050
Wherein,
00075AD is for describing frequency, in 0x00075AD=482000, i.e. this example, frequency 482MHz；
003 for describing modulation system, and in this example, 0x003 represents that modulation system is QAM64；For other modulation methods
Formula, such as QAM128 can be represented with 0x002；QAM256 can be represented with 0x001；
00001ADB is used for descriptor rate, in 0x00001ADB=6875, i.e. this example, symbol rate 6875.
04 for describing IP version, and in this example, 0x04 represents that IP version is IPV4；For IPV6 versions, then can use
0x06 is represented.
AC1E0320 is used to describe the homepage IP address of sub-headend portal, 0xAC=172,0x1E=30,0x03=03,0x20
=32, therefore, in this example, AC1E0320 represents that the homepage IP addresses of sub-headend portal are 172.30.3.32.
0050 for describing the homepage port numbers of sub-headend portal, in 0x0050=80, i.e. this example, sub-headend portal
Homepage port numbers are 80.
Step S13：When detecting the first linkage descriptor, the first video is parsed from first linkage descriptor
IP Information On Demand；
Step S14：The first video on demand information is stored into flash memory.
In the embodiment of the present application, the first video on demand information that parsing obtains is stored to the flash memory of top box of digital machine
（FLASH）In, when carrying out video on demand so as to user, frequency point is adjusted to the frequency entrained into the first video on demand information
Point, and the homepage IP address and port numbers according to sub-headend portal access sub-headend portal.
A kind of video on demand information acquisition method provided by the embodiments of the present application, the first chain is converted to by video on demand information
Descriptor is connect, top box of digital machine is then transferred to by network information table, top box of digital machine is obtained from digital television signal stream
Network information table；It detects and the first linkage descriptor whether is carried in the network information table, in first linkage descriptor
Carry the first video on demand information；The first video on demand information includes：First frequency point information and IP address information；Its
In, first frequency point information includes：First frequency, the first modulation system and the first symbol rate；The IP address information includes：
The version of IP address, the homepage IP address of sub-headend portal, the homepage port numbers of sub-headend portal；When detecting that the first link retouches
When stating symbol, the first video on demand information is parsed from first linkage descriptor；The first video on demand information is deposited
In storage to flash memory.When needing demand TV program, sub-headend portal is accessed according to the IP address stored in flash memory, so as to fulfill
Video on-demand function based on distributed portal site server.
In above-described embodiment, it is preferred that order user's request program of time-shift service for convenience, first link is retouched
Stating can also include in the IP address information in symbol：
The time shift IP address of sub-headend portal and the time shift port numbers of sub-headend portal.
In the embodiment of the present application, the time shift IP address of sub-headend portal refers to that time shift is navigated（Time Shifted Guide,
TSG）The IP address of the page；The time shift port numbers of sub-headend portal refer to that time shift is navigated（Time Shifted Guide, TSG）Page
The port numbers in face.
For example, on the basis of above-mentioned example, can also on the basis of First ray it is middle increase sub-headend portal when
The descriptor of IP address and the time shift port numbers of sub-headend portal is moved, specifically as shown in the second sequence, the second sequence is：
00075AD00300001ADB04AC1E03200050AC1E03640050AC1E03640050
Wherein, in the increased descriptor AC1E03640050,
AC1E0364 is used to describe the time shift IP address of sub-headend portal, 0xAC=172,0x1E=30,0x03=03,0x64
=100, therefore, in this example, AC1E0320 represents that the time shift IP addresses of sub-headend portal are 172.30.3.100.
0050 for describing the time shift port numbers of sub-headend portal, in 0x0050=80, i.e. this example, sub-headend portal
Homepage port numbers are 80.
In addition, it can also include in IP address information in first linkage descriptor：
The reserved port numbers of the reserved IP address of sub-headend portal and the sub-headend portal.
For example, on the basis of above-mentioned example, can also on the basis of First ray it is middle increase sub-headend portal when
The descriptor of IP address and the time shift port numbers of sub-headend portal is moved, specifically as shown in third sequence, third sequence is：
00075AD00300001ADB04AC1E03200050AC1E03640050AC1E030C35FB
Wherein, in the increased descriptor AC1E030C35FB of institute,
AC1E030C is used to describe the reserved IP address of sub-headend portal, 0xAC=172,0x1E=30,0x03=03,0x0C
=12, therefore, in this example, AC1E0320 represents that the time shift IP addresses of sub-headend portal are 172.30.3.12.
35FB is used to describing the reserved port numbers of sub-headend portal, in 0x35FB=13819, i.e. this example, sub-headend portal
Reserved port numbers be 13819.
In the embodiment of the present application, in order to enable set-top box can use branching out for sub-headend, first link is retouched
State symbol in can also include sub-headend portal reserved IP address and the sub-headend portal reserved port numbers, i.e., when point
When front-end portal extends new business, sub-headend portal can access sub-headend portal by reserved IP addresses and reserved port numbers.
On the basis of embodiment shown in Fig. 1, another kind video on demand information acquisition method provided by the embodiments of the present application
Flow chart as shown in Fig. 2, can also include：
Step S21：It detects and the second linkage descriptor whether is also carried in the network information table, second link is retouched
It states in symbol and carries the second video on demand information；The second video on demand information includes the second frequency point information, second frequency
Point information includes：Second frequency, the second modulation system and the second symbol rate；
It, can be in network information table in order to facilitate judging the second linkage descriptor whether is carried in network information table
Linkage descriptors are predefined, and the second linkage descriptor can be such as represented with 0xA0, i.e., ought be detected in network information table
Linkage descriptors be 0xA0 when, illustrate to carry the second linkage descriptor in network information table.
There are two types of the communication modes of top box of digital machine and sub-headend portal, respectively IP-QAM modes（The transmission of which
Medium is cable of cable TV）With IP modes（The transmission medium of which is cable）.And current, top box of digital machine and sub-headend
The communication mode of portal preferably selects IP modes to communicate.
In the embodiment of the present application, in order to avoid the communication blocking that single communication mode is brought, when sub-headend portal monitors
When being more than predetermined threshold value by the number of users that IP modes access, can the second link be sent to set-top box by network information table and retouched
Symbol is stated, the second frequency point information is carried in second linkage descriptor, which is used to indicate top box of digital machine tune
It is humorous to the frequency point to receive the video of user institute program request that sub-headend portal issues.
Specifically, the particular content of the second link description can be by second frequency, the second modulation system and the second symbol
The hexadecimal number sequence that number rate is converted to one several represents.For example, one second link provided by the embodiments of the present application
As shown in the 4th sequence, the 4th sequence is the example of descriptor：
000799500300001ADB
Wherein,
00079950 for describing frequency, and in 0x00079950=498000, i.e. this example, frequency is 498 MHz；
003 for describing modulation system, and in this example, 0x003 represents that modulation system is QAM64；For other modulation methods
Formula, such as QAM128 can be represented with 0x002；QAM256 can be represented with 0x001；
00001ADB is used for descriptor rate, in 0x00001ADB=6875, i.e. this example, symbol rate 6875.
Step S22：When detecting the second linkage descriptor, the second video is parsed from second linkage descriptor
IP Information On Demand determines the second frequency point；
Step S23：By the working frequency of the top box of digital machine be tuned to second frequency point；
Step S24：Transmission code stream is received from second frequency point.
Step S25：Judge whether that transmission code stream can be parsed from the transmission code stream that second frequency point receives
Mark, and will determine that result is stored into flash memory；
The judging result is used to select the reception mode of institute's order video, and the transmission mode includes IP-QAM modes
With IP modes.
Preferably, in the embodiment of the present application, when user's request program, if the judging result is can be from described second
Transmission code stream mark is parsed in the transmission code stream that frequency point receives, and the transmission code stream ident value is not default ident value,
IP-QAM modes is then selected to receive the video of user institute program request；If the judging result is cannot receive from second frequency point
To transmission code stream in parse transmission code stream mark or can be parsed from the transmission code stream that second frequency point receives
Go out transmission code stream mark, and the transmission code stream ident value is default ident value, then IP modes is selected to receive the program request of user institute
Video.
In the embodiment of the present application, the structure of the linkage descriptor of Linkage descriptors is specific such as 1 institute of table in network information table
Show.
Table 1
| Network linkage_descriptor(){ | Digit | Memonic symbol |
| descriptor_tag | 8 | uimsbf |
| descriptor_length | 8 | uimsbf |
| transport_stream_id | 16 | uimsbf |
| original_network_id | 16 | uimsbf |
| linkage_type | 8 | uimsbf |
| for(i=0;i<N;i++){ | 8 | uimsbf |
| private_data | 8N | bslbf |
| } | ||
| } |
Wherein, " linkage_type " represents the type of linkage descriptor, and value can be 0xA0（Represent the second link
Descriptor）Or 0xA1（Represent the first linkage descriptor）.
" private_data " represents the particular content of linkage descriptor, as indicated earlier in example
" 00075AD00300001ADB04AC1E03200050AC1E03640050 " etc..
In above-described embodiment, the first linkage descriptor and the second linkage descriptor can be carried out by a network information table
Transmission, can also be transmitted by two network information tables, be specifically not specifically limited using which kind of mode.
It should be noted that in the embodiment of the present application, first frequency point information is that set-top box reception carries video
The frequency point information of frequency locking required for transmission code stream, and required video point when IP address information is then user's order video
Information is broadcast, therefore, video on demand information acquisition method provided by the embodiments of the present application so that one-way set-top box（Fortune can only be received
It seeks the video information that quotient provides and is unable to order video）And bi-directional set-top box（The video information of operator's offer can be received again
It can order video）Video on demand information can be obtained automatically, and user does not need to artificially interfere, using more convenient.Moreover, operator
After establishing multiple servers, update set-top box software is not needed to.Pass through the network shunt of server（Select different video receptions
Mode IP-QAM modes and IP modes）So that the VoD network of user is more smooth.
Corresponding with embodiment of the method, the embodiment of the present application also provides a kind of video on demand Information Acquisition System, the application
A kind of structure diagram for video on demand Information Acquisition System that embodiment provides is as shown in figure 3, can include：
Acquisition module 31, first detection module 32, the first parsing module 33 and memory module 34；Wherein,
Acquisition module 31 is used to obtain the network information table in digital television signal stream；
First detection module 32 is for detecting the first linkage descriptor whether is carried in the network information table, and described the
The first video on demand information is carried in one linkage descriptor；The first video on demand information includes：First frequency point information and
IP address information；Wherein, first frequency point information includes：First frequency, the first modulation system and the first symbol rate；The IP
Address information includes：The version of IP address, the homepage IP address of sub-headend portal, the homepage port numbers of sub-headend portal；
First parsing module 33 is used for when detecting the first linkage descriptor, is parsed from first linkage descriptor
Go out the first video on demand information；
Memory module 34 is used to store the first video on demand information into flash memory.
Video on demand information is converted to the first link description by a kind of video on demand Information Acquisition System that the application provides
Symbol, is then transferred to top box of digital machine by network information table, and top box of digital machine obtains network letter from digital television signal stream
Cease table；It detects and the first linkage descriptor whether is carried in the network information table, carried in first linkage descriptor
First video on demand information；The first video on demand information includes：First frequency point information and IP address information；Wherein, it is described
First frequency point information includes：First frequency, the first modulation system and the first symbol rate；The IP address information includes：IP address
Version, the homepage IP address of sub-headend portal, the homepage port numbers of sub-headend portal；When detecting the first linkage descriptor
When, the first video on demand information is parsed from first linkage descriptor；By the first video on demand information store to
In flash memory.When needing demand TV program, sub-headend portal is accessed according to the IP address stored in flash memory, so as to fulfill based on
The video on-demand function of distributed portal site server.
Above-described embodiment, it is preferred that order user's request program of time-shift service, the first link description for convenience
It can also include in IP address information in symbol：
The time shift IP address of sub-headend portal and the time shift port numbers of sub-headend portal.
In the embodiment of the present application, the time shift IP address of sub-headend portal refers to that time shift is navigated（Time Shifted Guide,
TSG）The IP address of the page；The time shift port numbers of sub-headend portal refer to that time shift is navigated（Time Shifted Guide, TSG）Page
The port numbers in face.
For example, on the basis of above-mentioned example, can also on the basis of First ray it is middle increase sub-headend portal when
The descriptor of IP address and the time shift port numbers of sub-headend portal is moved, specifically as shown in the second sequence, the second sequence is：
00075AD00300001ADB04AC1E03200050AC1E03640050AC1E03640050
Wherein, in the increased descriptor AC1E03640050,
AC1E0364 is used to describe the time shift IP address of sub-headend portal, 0xAC=172,0x1E=30,0x03=03,0x64
=100, therefore, in this example, AC1E0320 represents that the time shift IP addresses of sub-headend portal are 172.30.3.100.
0050 for describing the time shift port numbers of sub-headend portal, in 0x0050=80, i.e. this example, sub-headend portal
Homepage port numbers are 80.
In addition, it can also include in IP address information in first linkage descriptor：
The reserved port numbers of the reserved IP address of sub-headend portal and the sub-headend portal.
For example, on the basis of above-mentioned example, can also on the basis of First ray it is middle increase sub-headend portal when
The descriptor of IP address and the time shift port numbers of sub-headend portal is moved, specifically as shown in third sequence, third sequence is：
00075AD00300001ADB04AC1E03200050AC1E03640050AC1E030C35FB
Wherein, in the increased descriptor AC1E030C35FB of institute,
AC1E030C is used to describe the reserved IP address of sub-headend portal, 0xAC=172,0x1E=30,0x03=03,0x0C
=12, therefore, in this example, AC1E0320 represents that the time shift IP addresses of sub-headend portal are 172.30.3.12.
35FB is used to describing the reserved port numbers of sub-headend portal, in 0x35FB=13819, i.e. this example, sub-headend portal
Reserved port numbers be 13819.
On the basis of embodiment shown in Fig. 3, another kind video on demand Information Acquisition System provided by the embodiments of the present application
Structure diagram as shown in figure 4, can also include：
Second detection module 41, the second parsing module 42, tuner module 43, receiving module 44 and judgment module 45；Wherein,
Second detection module 41 is for detecting the second linkage descriptor whether is carried in the network information table, and described the
The second video on demand information is carried in two linkage descriptors；The second video on demand information includes the second frequency point information, institute
The second frequency point information is stated to include：Second frequency, the second modulation system and the second symbol rate；
Second parsing module 42 is used for when detecting the second linkage descriptor, is parsed from second linkage descriptor
Go out the second video on demand information, determine the second frequency point；
Tuner module 43 be used for by the working frequency of the top box of digital machine be tuned to second frequency point；
Receiving module 44 is used to receive transmission code stream from second frequency point；
Judgment module 45 is used to judge whether that transmission can be parsed from the transmission code stream that second frequency point receives
The mark of code stream, and will determine that result is stored into flash memory；The judging result is used to select the transmission mode of institute's order video.
On the basis of embodiment shown in Fig. 4, another video on demand Information Acquisition System provided by the embodiments of the present application
Structure diagram as shown in figure 5, can also include：
Reception mode selecting module 51, for when user's request program, if the judging result is can be from described the
Transmission code stream is parsed in the transmission code stream that two frequency points receive, and the transmission code stream ident value is not default ident value, then
Selection IP-QAM modes transmit the video of user institute program request；If the judging result cannot second frequency point receive
Transmission code stream mark is parsed in transmission code stream or biography can be parsed from the transmission code stream that second frequency point receives
Defeated code stream identification, and the transmission code stream ident value is default ident value, then IP modes is selected to transmit the video of user institute program request.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide range caused.
Claims (8)
1. a kind of video on demand information acquisition method, applied to top box of digital machine, which is characterized in that including：
Obtain the network information table in digital television signal stream；
It detects and the first linkage descriptor or the second linkage descriptor whether is carried in the network information table, first link
The first video on demand information is carried in descriptor；The first video on demand information includes：First frequency point information and IP address
Information；Wherein, first frequency point information includes：First frequency, the first modulation system and the first symbol rate；The IP address letter
Breath includes：The version of IP address, the homepage IP address of sub-headend portal, the homepage port numbers of sub-headend portal；Second chain
When connecing descriptor and monitoring that the number of users accessed by IP modes is more than predetermined threshold value by sub-headend portal, believed by the network
Breath table is sent to the top box of digital machine；The second video on demand information is carried in second linkage descriptor；Described second
Video on demand information includes the second frequency point information, and second frequency point information includes：Second frequency, the second modulation system and second
Symbol rate；
When detecting the first linkage descriptor, the first video on demand information is parsed from first linkage descriptor；
The first video on demand information is stored into flash memory；
When detecting the second linkage descriptor, the second video on demand information is parsed from second linkage descriptor, really
Fixed second frequency point；
By the working frequency of the top box of digital machine be tuned to second frequency point；
Transmission code stream is received from second frequency point；
Judge whether that the mark of transmission code stream can be parsed from the transmission code stream that second frequency point receives, and will determine that
As a result it stores into flash memory；
The judging result is used to select the reception mode of institute's order video.
2. according to the method described in claim 1, it is characterized in that, the IP address information further includes：
The time shift IP address of sub-headend portal and the time shift port numbers of sub-headend portal.
3. it according to the method described in claim 1, it is characterized in that, further includes：
When user's request program, if the judging result is can parse from the transmission code stream that second frequency point receives
Go out transmission code stream mark, and the transmission code stream ident value is not default ident value, then IP-QAM modes is selected to receive user institute
The video of program request；If the judging result is cannot parse transmission code from the transmission code stream that second frequency point receives
Traffic identifier can parse transmission code stream mark, and the transmission from the transmission code stream that second frequency point receives
Code stream identification value is default ident value, then IP modes is selected to receive the video of user institute program request.
4. according to the method described in claim 1, it is characterized in that, the IP address information further includes：
The reserved port numbers of the reserved IP address of sub-headend portal and the sub-headend portal.
5. a kind of video on demand Information Acquisition System, applied to top box of digital machine, which is characterized in that including：
Acquisition module, for obtaining the network information table in digital television signal stream；
First detection module, for detecting the first linkage descriptor whether is carried in the network information table, first chain
It connects and the first video on demand information is carried in descriptor；The first video on demand information includes：First frequency point information and IP
Location information；Wherein, first frequency point information includes：First frequency, the first modulation system and the first symbol rate；The IP address
Information includes：The version of IP address, the homepage IP address of sub-headend portal, the homepage port numbers of sub-headend portal；
Second detection module, for detecting the second linkage descriptor whether is carried in the network information table, second chain
When connecing descriptor and monitoring that the number of users accessed by IP modes is more than predetermined threshold value by sub-headend portal, believed by the network
Breath table is sent to the top box of digital machine；The second video on demand information is carried in second linkage descriptor；Described second
Video on demand information includes the second frequency point information, and second frequency point information includes：Second frequency, the second modulation system and second
Symbol rate；
First parsing module, for when detecting the first linkage descriptor, parsing from first linkage descriptor
One video on demand information；
Memory module, for storing the first video on demand information into flash memory；
Second parsing module, for when detecting the second linkage descriptor, parsing from second linkage descriptor
Two video on demand information, determine the second frequency point；
Tuner module, for by the working frequency of the top box of digital machine be tuned to second frequency point；
Receiving module, for receiving transmission code stream from second frequency point；
Judgment module, for judging whether that transmission code stream can be parsed from the transmission code stream that second frequency point receives
Mark, and will determine that result is stored into flash memory；The judging result is used to select the transmission mode of institute's order video.
6. system according to claim 5, which is characterized in that the IP address information further includes：
The time shift IP address of sub-headend portal and the time shift port numbers of sub-headend portal.
7. system according to claim 5, which is characterized in that further include：
Reception mode selecting module, for when user's request program, if the judging result is can be from second frequency point
Transmission code stream is parsed in the transmission code stream received, and the transmission code stream ident value is not default ident value, then selects IP-
QAM modes transmit the video of user institute program request；If the judging result is the transmission that cannot be received from second frequency point
Transmission code stream mark is parsed in code stream or transmission code can be parsed from the transmission code stream that second frequency point receives
Traffic identifier, and the transmission code stream ident value is default ident value, then IP modes is selected to transmit the video of user institute program request.
8. system according to claim 5, which is characterized in that state IP address information and further include：
The reserved port numbers of the reserved IP address of sub-headend portal and the sub-headend portal.
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| CN105657458A (en) * | 2016-02-17 | 2016-06-08 | 福建新大陆通信科技股份有限公司 | Method and system for copying virtual program based on NIT private description |
| CN108235061B (en) * | 2018-03-02 | 2020-09-15 | 深圳创维数字技术有限公司 | Main frequency point updating method, device, terminal and computer readable medium |
| CN108668155A (en) * | 2018-05-03 | 2018-10-16 | 浙江纷视网络信息技术有限公司 | A kind of hotel's intelligence IPTV system and its implementation |
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