CN103024518A - Generation method and generation device of network information table transport stream - Google Patents
Generation method and generation device of network information table transport stream Download PDFInfo
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- CN103024518A CN103024518A CN2012105651368A CN201210565136A CN103024518A CN 103024518 A CN103024518 A CN 103024518A CN 2012105651368 A CN2012105651368 A CN 2012105651368A CN 201210565136 A CN201210565136 A CN 201210565136A CN 103024518 A CN103024518 A CN 103024518A
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Abstract
The invention discloses a generation method and a generation device of a network information table transport stream. The generation method includes the steps: extracting an original network information table TS (transport stream) packet from an original bit stream file; reading network information table data from the original network information table TS packet and displaying the network information table data; editing the network information table data; and reassembling the edited network information table data to generate the network information table transport stream. By applying the generation method, the transport stream only including a network information table can be obtained on a computer through software without adding hardware, and the method is simple and flexible in implementation process, low in cost and convenient to use, popularize and apply.
Description
Technical field
The present invention relates to digital television techniques, specifically, relate to the obtaining of transport stream in the Digital Television, more particularly, relate to generation method and the generating apparatus of network information table (NIT) transport stream.
Background technology
Along with the fast development of digital technology, digital television replaces conventional television and popularizes.In the digital television business information standard, network information table (Nerwork Information Table, NIT) is a table being responsible for transmitting transport stream (Transport Stream, TS stream) physical structure and self Internet Transmission characteristic relevant information.
At present, when some set-top box is carried out software upgrading, need to trigger with network information table.Therefore, need in the software upgrading code stream, insert network information table information.Because network information table is cut into a plurality of network information sections, each section be by the TS bag transmission of appointment, and in each TS bag except including network information table information, also include other table information.So, for obtaining network information table information, require the broadcasting and TV front end to have the equipment of broadcast code flow, and possesses the instrument of revising code stream information, in order to from a plurality of TS bags, network information table information is all extracted, revise as required the descriptor information of network information table, to satisfy the upgrading needs.This method of obtaining the network information table transport stream that only comprises network information table information requires to be equipped with special-purpose front end hardware equipment, and acquisition process is complicated, and cost is higher, is unfavorable for promoting the use of.
Summary of the invention
The object of the present invention is to provide a kind of generation method and generating apparatus of network information table transport stream, with simply, software mode obtains only to comprise the transport stream of network information table flexibly, satisfies the use of updating set-top box software and other purposes.
For achieving the above object, method provided by the invention adopts following technical proposals to be achieved:
A kind of generation method of network information table transport stream, described method comprises the steps:
A1, from the source code flow file, extract primitive network information table TS bag;
A2, from primitive network information table TS bag, read out the network information table data, and show;
A3, editing network information table data;
A4, the network information table data after will editing re-assembly generating network information table transport stream.
Aforesaid method also comprised the steps: before described step a1
A0, editing interface forms are arranged in forms and the semantic field of network information section text box one to one;
In described step a2, the data based network information section of network information table semanteme is shown by corresponding text box respectively.
Aforesaid method is processed for ease of data, in described step a2, at first reads out the network information table data from primitive network information table TS bag, is saved in the one-dimension array; Then, from one-dimension array, extract successively each semantic field of network information section, and the tax field value shows for corresponding text box.
Aforesaid method, in described step a2, the detailed process that reads out the network information table data from primitive network information table TS bag is:
Read grid descriptor length greater than 0 TS bag;
From the TS bag, extract length value;
From the TS bag, extract the network information table data according to length value.
Aforesaid method in described step a3, is convenient editor, preferably passes through to add button, delete button and the corresponding network information section of modification button editor semantic word segment value in the text box of interface forms, realizes the editor to the network information table data.
Aforesaid method, described step a1 extracts primitive network information table TS bag from the source code flow file detailed process is:
Open the source code flow file that includes network information table;
Determine sync byte position and primitive network information table TS bag length according to the source code flow file;
Section sum and segment length according to source code flow file acquisition network information table;
Calculate the TS bag number that each section comprises according to segment length and TS bag length;
From sync byte position, read successively corresponding each bag of each section according to section sum and TS bag number.
Aforesaid method, the network information table data after described step a4 will edit re-assembly, the detailed process of generating network information table transport stream is:
Network information section semanteme and network information segment length according to network information table require to re-assembly each network information section;
Data based described primitive network information table TS bag length in each network information section is converted into corresponding TS bag, writes in the TS file, thus generating network information table transfer stream file.
For achieving the above object, device provided by the invention adopts following technical proposals to be achieved:
A kind of generating apparatus of network information table transport stream, described device comprises:
Primitive network information table TS wraps extraction unit, is used for extracting primitive network information table TS bag from the source code flow file;
The network information table data extracting unit is connected with primitive network information table TS bag extraction unit, is used for extracting the network information table data from primitive network information table TS bag;
The network information table data display unit is connected with the network information table data extracting unit, is used for showing the network information table data of extracting;
Network information table data edition unit is connected with the network information table data extracting unit, is used for editing the network information table data of extracting;
Network information table transport stream module units is connected with network information table data edition unit, is used for the network information table data behind the editor are re-assemblied generating network information table transport stream.
Aforesaid device, described network information table data display unit and described network information table data edition unit realize by the interface text box that preferably corresponding, described device also comprises:
The interface unit is used for the design interface forms, and arranges in forms and the semantic field of network information section text box one to one.
Compared with prior art, advantage of the present invention and good effect are: the present invention is by going out the network information table data according to certain Rule Extraction the ASCII stream file ASCII that includes the network information table data from other, data are shown the confession user edits, conveniently add private setting descriptor information and generate Extraordinary network information table data, then the data based certain rule of the network information table after will editing regenerates and only comprises network information table data transfer stream, use for updating set-top box software or other purposes, the process that acquisition only comprises the transport stream of network information table need not to set up hardware, can realize by software mode on computers, implementation procedure is simple, flexibly, easy to use, cost is lower, and is easy to utilize.
After reading the specific embodiment of the present invention by reference to the accompanying drawings, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the structured flowchart of an embodiment of network information table transport stream generator of the present invention;
Fig. 2 is the flow chart of an embodiment of network information table transmission stream generating method of the present invention;
Fig. 3 is the particular flow sheet that extracts an embodiment of primitive network information table TS bag from the source code flow file;
Fig. 4 is the particular flow sheet that extracts the network information table data and show an embodiment;
Fig. 5 be editing network information table data and re-assembly, the particular flow sheet of an embodiment of generating network information table transport stream.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail.
Please refer to Fig. 1, this Figure 1 shows that the structured flowchart of an embodiment of network information table transport stream generator of the present invention.
As shown in Figure 1, included construction unit, annexation and the function between each unit of the device of this embodiment is as follows, comprising:
Primitive network information table TS wraps extraction unit 11, is used for extracting primitive network information table TS bag from the source code flow file.
Network information table data extracting unit 12 is connected with primitive network information table TS bag extraction unit 11, is used for extracting the network information table data from primitive network information table TS bag.
Network information table data display unit 13 is connected with network information table data extracting unit 12, is used for showing the network information table data of extracting.
Network information table data edition unit 14 is connected with network information table data extracting unit 12, is used for editing the network information table data of extracting.
Network information table transport stream module units 15 is connected with network information table data edition unit 14, is used for the network information table data behind the editor are re-assemblied generating network information table transport stream.
Above-mentioned each unit can adopt computer processor, realize in conjunction with the corresponding software program that the specific implementation process can be referring to figs. 2 to Fig. 5 and following description to each accompanying drawing.At this moment, the source code flow file is the ASCII stream file ASCII that is stored in the computer.
For network information table data display unit 13 and network information table data edition unit 14, preferably realize by the interface text box.When adopting text box to realize, also include interface unit 16 in the device.This interface unit 16 is connected with network information table data edition unit 14 with network information table data display unit 13 respectively, be used for the design interface forms, in forms, arrange and the semantic field of network information section text box one to one, in order to display window is provided and provides editor for network information table data edition unit 14 for network information table data display unit 13.
Please refer to Fig. 2, this Figure 2 shows that the flow chart of an embodiment of network information table transmission stream generating method of the present invention.
As shown in Figure 2, this embodiment is as follows by the process that software mode generates the transport stream that only comprises network information table:
Step 21: flow process begins.
Step 22: from the source code flow file, extract primitive network information table TS bag.
The source code flow file is that the broadcasting and TV front end is wanted the transmitted stream file, include the TS bag of a plurality of tables in this ASCII stream file ASCII, this step is to extract primitive network information table, both TS bags at the network information table place before the editor from the source code flow file, and this primitive network information table TS bag can be by unique identifications such as Packet Identifier, table identifiers.Concrete leaching process can be with reference to reaching following description to Fig. 3 shown in figure 3 particular flow sheets.
Step 23: from primitive network information table TS bag, read out network information table data and demonstration.
Implementation procedure can be with reference to shown in figure 4 particular flow sheets and following description to Fig. 4 more specifically to read network information table data and show one.
Step 24: editing network information table data.
Editing network information table data as required are as increasing private setting descriptor, to realize selectivity software upgrading etc.
Step 25: the network information table data after will editing re-assembly, generating network information table transport stream.
Network information table data behind the editor need to re-start assembling, generate only to include network information table data transfer stream.Editing network information table data and re-assembly, a specific implementation process of generating network information table transport stream can be with reference to shown in Figure 5 and follow-up description to Fig. 5.
Step 26: flow process finishes.
Obtain only to include in the transport stream network information table data by said process, and these data are to edit as required data afterwards, can use for the set-top box application that only needs the network information table data, for example, can be directly and the upgrading code stream multiplex, use as the trigger data of updating set-top box software.And the realization of said process can be in common computer, realize by writing relevant software, need not by means of special hardware device, and implementation procedure is simple, flexibly, and easy to use, cost is lower, and is easy to utilize.
Please refer to Fig. 3, from the source code flow file, extract primitive network information table TS bag and specifically can adopt the step of following embodiment to realize:
Step 301: flow process begins.
Step 302: the editing interface forms, in forms, arrange the text box with each semantic Related fields of network information section.
In this embodiment, in order to show and editing network information table data, at interface forms of computer inediting, and in forms, arrange and each semantic field of network information section a plurality of text boxes one to one, and a rational layout is carried out in the position of text box in whole forms.Definition according to the digital video broadcasting relevant specification, network information table is cut into a plurality of network information sections, each network information section has the grammer of standard, the semantic fields of a plurality of network information sections that employing sequentially defines consist of, and the shared figure place of each semantic field, the semanteme of expression all have clear.Can store in the specified byte position data of the information such as table identifier, Packet Identifier, section sum, segment length, TS bag length of reflection network information section in the TS of each network information section, the transport network information section bag.By reading the data of specified byte, can obtain corresponding information; Equally, when consisting of TS bag and network information section, also to assemble according to the data structure of this regulation.
Step 303: open the source code flow file that contains the NIT table.
As previously mentioned, the source code flow file is that the broadcasting and TV front end is wanted the transmitted stream file.
Step 304: determine that sync byte position and TS bag is long.
Open after the source code flow file, determine sync byte position and include the primitive network information table TS bag of TS bag at network information table place long according to ASCII stream file ASCII.
Step 305: section sum and the segment length of obtaining the NIT table.
According to the source code flow file, can obtain the section sum of network information table and the segment length of each section.
Step 306: reading first three byte is the TS bag of 0x47,0x40 and 0x10, is written in the file.
According to the definition of digital video broadcasting relevant specification, first three byte of network information table TS bag is 0x47,0x40 and 0x10, and therefore, reading first three byte is the TS bag of this expression, has also namely read network information table TS bag.Then, be first written in the default file TS bag that reads temporary.
Because a complete network information table can include a plurality of TS bags, therefore, need to read singly, the mode that adopts circulation to read realizes.
Step 307: when reading the TS bag, a section counting variable section_num is set first, initialize is 0, as cyclic variable.
Step 308: long to calculate the TS bag number that present segment should comprise be packets_number according to the segment length of above-mentioned acquisition and TS bag.
Step 309: judge whether the TS bag number that reads equals packets_number.If, execution in step 311; Otherwise, go to step 310.
Step 310: if the TS that has read bag number is not equal to packets_number, illustrate that the TS bag of present segment does not also run through, then reading first three byte of the next one is the TS bag of 0x47,0x40 and 0x10, and writes in the file.Then, go to step 309, continue to judge.
Step 311: if the TS that has read bag number equals packets_number, illustrate that the TS bag of present segment all runs through, section counting variable section_num is added 1 certainly.
Step 312: judge that whether section counting variable section_num is less than the section sum.If, illustrate also to exist network information Duan Wei to read, then go to step 306, continue to read the process of corresponding network information table TS bag in the next section.If illustrate that all network information sections of network information table all run through execution in step 313.
Step 313: the process of extracting primitive network information table TS bag from the source code flow file finishes.
Fig. 4 shows the particular flow sheet of an embodiment who extracts the network information table data and show.Can adopt following step that the network information table data in the network information table TS bag are extracted and show that so that revise editing network information table data, concrete steps are as follows:
Step 401: flow process begins.
Step 402: from Fig. 3 preserves the file of network information table TS bag, read grid descriptor length greater than 0 TS bag.
The purpose of this step is to read effective TS bag data, and processes, and avoids reading invalid data and affects processing speed.
Step 403: from the current TS bag, extract segment length.
Have a field describing the network information segment length that comprises in this bag in each TS bag, by reading this field, just can obtain the length value in the current TS bag.
Step 404: from the TS bag, extract the NIT data of present segment according to segment length, and be saved in the one-dimension array.
Be the convenient value of from the NIT data, obtaining the semantic field of each network information section, be used for showing respectively and edit-modify that this embodiment is provided with an one-dimension array, and the NIT data that read are saved in this array.
Step 405: from one-dimension array, extract successively each semantic field of network information section, and field value is assigned to corresponding text box shows.
Step 406: whether each semantic field of network information section of judging all sections reads complete.If not, go to step 402, continue to read.If, execution in step 408.
Determination methods is with reference to figure 3, can the section of setting counting variable section_num, and initialize is 0, has whenever read a section, section_num is from adding 1.Then, judge whether to have run through all sections by the magnitude relationship of judging section_num and section sum.
Step 407: after having read all sections, flow process finishes.
By the processing of each step of Fig. 4, primitive network information table data will show in text box successively according to the semantic field of network information section, and the user can see the concrete data of all semantic fields by checking text box.
Please refer to Fig. 5, give Figure 5 shows that editing network information table data and re-assembly, the particular flow sheet of an embodiment of generating network information table transport stream, each step that this flow process specifically comprises is as follows:
Step 501: flow process begins.
Step 502: at interface forms text box inediting network information section semantic word segment value.
Owing to can show a corresponding network information section semantic word segment value in the text box, so, can in text box, arrange and add button, delete button and modification button as the button of Edit Text frame, the user just can carry out edit-modify to each network information section semantic word segment value as required, for example, increase private setting descriptor, satisfy upgrade requirement etc., thus the network information table data after can obtaining to edit.
Step 503: travel through all text boxes, requirement calculates the sum of network information section according to network information segment length, calculates simultaneously total group of number of TS stream.
Because the semantic field of the network information table data subnetwork message segment behind the editor disperses to deposit, in order to obtain complete network information table TS stream, need all field datas are re-assemblied.At first, travel through all text boxes, also namely travel through the semantic field of all-network message segment, obtain the shared byte number of all fields; Then, require according to network information segment length and total bytes calculates the sum of network information section.
According to the relevant specification regulation, the length of network information section will meet certain requirements, and in general, the overall length of a network information section is 1024 bytes.Therefore, be 1024 just can calculate the sum of the network information section that the network information table data needs behind the editor cut according to total bytes and length.
Because the shared byte number of TS bag is determined according to primitive network information table TS bag, fix, be generally 188 bytes, therefore, obtaining after network information section sum and network information segment length require, just can calculate total number that TS that the transport stream that regenerates comprises wraps.
The purpose that the sum of this step computing network message segment and TS wrap total number be variable is set, as the reference value of variable, so that circulation assembling network information section and corresponding TS bag.
Step 504: semantic and network information segment length requirement re-assemblies corresponding each network information section of network information table data behind the editor according to the network information section of NIT table.
This assembling process can with reference to the process of broadcasting and TV front end assembling network information section in the prior art, not repeated at this.
Step 505: according to primitive network information table TS bag is long data in each network information section are converted to corresponding TS bag, write in the TS file generating network information table transfer stream file.
Step 506: flow process finishes.
By said process, can obtain only to comprise network information table data transfer stream file, can in the relevant application of this transfer stream file of needs, use easily.
Above embodiment is only in order to illustrating technical scheme of the present invention, but not limits it; Although with reference to previous embodiment the present invention is had been described in detail, for the person of ordinary skill of the art, still can make amendment to the technical scheme that previous embodiment is put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of the present invention's technical scheme required for protection.
Claims (9)
1. the generation method of a network information table transport stream is characterized in that, described method comprises the steps:
A1, from the source code flow file, extract primitive network information table TS bag;
A2, from primitive network information table TS bag, read out the network information table data, and show;
A3, editing network information table data;
A4, the network information table data after will editing re-assembly generating network information table transport stream.
2. method according to claim 1 is characterized in that, also comprises the steps: before described step a1
A0, editing interface forms are arranged in forms and the semantic field of network information section text box one to one;
In described step a2, the data based network information section of network information table semanteme is shown by corresponding text box respectively.
3. method according to claim 2 is characterized in that, in described step a2, at first reads out the network information table data from primitive network information table TS bag, is saved in the one-dimension array; Then, from one-dimension array, extract successively each semantic field of network information section, and the tax field value shows for corresponding text box.
4. method according to claim 3 is characterized in that, in described step a2, the process that reads out the network information table data from primitive network information table TS bag is:
Read grid descriptor length greater than 0 TS bag;
From the TS bag, extract length value;
From the TS bag, extract the network information table data according to length value.
5. method according to claim 2, it is characterized in that, in described step a3, in the text box of interface forms, by adding button, delete button and the corresponding network information section of modification button editor semantic word segment value, realize the editor to the network information table data.
6. each described method in 5 according to claim 1 is characterized in that described step a1 extracts primitive network information table TS bag from the source code flow file process is:
Open the source code flow file that includes network information table;
Determine sync byte position and primitive network information table TS bag length according to the source code flow file;
Section sum and segment length according to source code flow file acquisition network information table;
Calculate the TS bag number that each section comprises according to segment length and TS bag length;
From sync byte position, read successively corresponding each bag of each section according to section sum and TS bag number.
7. method according to claim 6 is characterized in that, the network information table data after described step a4 will edit re-assembly, the process of generating network information table transport stream is:
Network information section semanteme and network information segment length according to network information table require to re-assembly each network information section;
Data based described primitive network information table TS bag length in each network information section is converted into corresponding TS bag, writes in the TS file, thus generating network information table transfer stream file.
8. the generating apparatus of a network information table transport stream is characterized in that, described device comprises:
Primitive network information table TS wraps extraction unit, is used for extracting primitive network information table TS bag from the source code flow file;
The network information table data extracting unit is connected with primitive network information table TS bag extraction unit, is used for extracting the network information table data from primitive network information table TS bag;
The network information table data display unit is connected with the network information table data extracting unit, is used for showing the network information table data of extracting;
Network information table data edition unit is connected with the network information table data extracting unit, is used for editing the network information table data of extracting;
Network information table transport stream module units is connected with network information table data edition unit, is used for the network information table data behind the editor are re-assemblied generating network information table transport stream.
9. device according to claim 8 is characterized in that, described network information table data display unit and described network information table data edition unit realize that by the interface text box described device also comprises:
The interface unit is used for the design interface forms, and arranges in forms and the semantic field of network information section text box one to one.
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