CN105100820A - Digital media file encoding method, decoding method, encoding device and decoding device - Google Patents
Digital media file encoding method, decoding method, encoding device and decoding device Download PDFInfo
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- CN105100820A CN105100820A CN201510509098.8A CN201510509098A CN105100820A CN 105100820 A CN105100820 A CN 105100820A CN 201510509098 A CN201510509098 A CN 201510509098A CN 105100820 A CN105100820 A CN 105100820A
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 210000000746 body region Anatomy 0.000 claims description 27
- 239000000126 substance Substances 0.000 claims description 4
- 238000005538 encapsulation Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009466 transformation Effects 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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/835—Generation of protective data, e.g. certificates
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Storage Device Security (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a digital media file encoding method which comprises the following steps: encoding a first digital media file to obtain an intermediate coding file; and combining a pretreatment protocol and the intermediate coding file into a second digital media file, wherein the second digital media file comprises a main body area and a protocol information area, which are used for storing the intermediate coding file and the pretreatment protocol respectively. The pretreatment protocol comprises a plurality of bytes which indicate identification code, address indication and coding type respectively. The identification code is used for indicating the protocol information area; the address indication is used for indicating the address of the main body area; and the coding type is used for identifying the encoding mode of the intermediate coding file.
Description
Technical field
The present invention relates to multimedia technology field, relate to the coding method of digital media file, coding/decoding method, code device and decoding device particularly.
Background technology
Digital media file refers to the file of acquisition of being encoded in a predetermined manner by audio, video data, then encapsulate in a pre-defined format.Along with popularizing of high-definition video technology, the coding of digital media file and encapsulation format be variation day by day also.Digital media player device needs the encapsulation format knowing digital media file, then decodes to audio, video data, just can play sound and image.In Audiotechnica field, the Document encapsulation form of main flow comprises WAVE, MP3, OGG, WMA, APE, FLAC.In high-definition video technology, main Document encapsulation form comprises TS, AVI, MKV, MOV.
In the cataloged procedure of the digital media file of above-mentioned prior art, directly format conversion algorithms is performed to original figure media data.In playing process, digital media player device adopts relevant decoding algorithm to realize decoding and the broadcasting of file.But, there is following defect in the coding method of the digital media file of prior art and coding/decoding method: first, for whole system, fixing encryption algorithm can only be adopted, self-adapting estimation can not be carried out to the encryption algorithm of file, for Play System, must know that encryption algorithm can be decoded in advance; The second, single coded system can only be realized, easily crack.
Summary of the invention
In view of this, the invention provides a kind of coding method of digital media file, a kind of coding/decoding method of digital media file, the code device of digital media file and decoding device, the copyright of digital media file can be protected.
According to a first aspect of the invention, a kind of coding method of digital media file is provided, comprises: the first digital media file is encoded, to obtain intermediate code file; And preliminary treatment agreement is become the second digital media file with intermediate code Piece file mergence, wherein, second digital media file comprises body region and protocol information district, be respectively used to deposit intermediate code file and preliminary treatment agreement, described preliminary treatment agreement comprises multiple byte, indicate identification code, address instruction and type of coding respectively, described identification code is used to indicate protocol information district, the instruction of described address is used to indicate the address of described body region, and described type of coding is for knowing the coded system of described intermediate code file.
Preferably, described coding comprise be selected from xor operation, be fixed variable operation, regular length position exchange at least one.
Preferably, User Defined coding is encoded to described in.
Preferably, described first digital media file is standard digital media file, and described second digital media file is the digital media file of Reseal.
Preferably, before or after described protocol information district is positioned at described body region.
Preferably, described identification code is immobilized substance.
Preferably, described address is designated as the address of described body region.
Preferably, described address is designated as the length in described protocol information district.
According to a second aspect of the invention, a kind of code device of digital media file is provided, comprises: the first and second storage devices, be respectively used to storage first digital media file and the second digital media file; First coding module, obtains the first digital media file from the first storage device, encodes to the first digital media file, to obtain intermediate code file; And second coding module, preliminary treatment agreement is become the second digital media file with intermediate code Piece file mergence, second digital media file comprises body region and protocol information district, be respectively used to deposit intermediate code file and preliminary treatment agreement, and the second digital media file is provided to the second storage device.
According to a third aspect of the invention we, a kind of coding/decoding method of digital media file is provided, comprises: resolve the first digital media file, to obtain the identification code of preliminary treatment agreement; According to preliminary treatment agreement, the first digital media file is decoded, to generate the second digital media file; And the second digital media file is decoded as standard digital media file.
Preferably, described coding/decoding method also comprises: when described first digital media file does not comprise described identification code, decoded by the first digital media file as standard digital media file.
Preferably, decoding is carried out to the first digital media file and comprises: according to the identification code in preliminary treatment agreement, judge whether the first digital media file comprises body region and protocol information district; According to the address instruction in preliminary treatment agreement, obtain the address of body region in the first digital media file; According to described address, the first digital media file is divided into intermediate code file and preliminary treatment agreement, wherein intermediate code file comprises body region content, and preliminary treatment protocol package is containing preliminary treatment protocol contents; And according to the type of coding in preliminary treatment agreement, decode to obtain the second digital media file to middle coded file.
Preferably, decoding process comprise be selected from xor operation, subtract fixed variable operation, regular length position exchange at least one.
Preferably, described decoding process is for decoding according to User Defined coding.
According to fourth direction of the present invention, a kind of decoding device of digital media file is provided, comprises: storage device, store the first digital media file; Resolver, resolves the first digital media file, to obtain the identification code of preliminary treatment agreement; First decoder module, according to preliminary treatment agreement, decodes to the first digital media file, to generate the second digital media file; And second decoder module, the second digital media file is decoded as standard digital media file.
Preferably, described decoding device also comprises: shunting device, is connected between resolver and decoder module, for when described first digital media file does not comprise described identification code, the first digital media file is directly provided to decoder module.
Coding method of the present invention and code device, by Reseal digital media file, the digital media file after making common Play System cannot play-over encapsulation, can protect the copyright of digital media file better.Coding/decoding method of the present invention and decoding device provide the method and apparatus playing the described digital media file encapsulated.
Accompanying drawing explanation
By referring to the description of accompanying drawing to the embodiment of the present invention, above-mentioned and other objects, features and advantages of the present invention will be more clear, in the accompanying drawings:
Fig. 1 is the schematic flow sheet of the coding method of digital media file according to the embodiment of the present invention.
Fig. 2 is the schematic block diagram of the code device of digital media file according to the embodiment of the present invention.
Fig. 3 is the schematic flow sheet of the coding/decoding method of digital media file according to the embodiment of the present invention.
Fig. 4 is the schematic block diagram of the decoding device of digital media file according to the embodiment of the present invention.
Embodiment
Based on embodiment, present invention is described below, but the present invention is not restricted to these embodiments.In hereafter details of the present invention being described, detailedly describe some specific detail sections.Do not have the description of these detail sections can understand the present invention completely for a person skilled in the art yet.In order to avoid obscuring essence of the present invention, known method, process, flow process, element and circuit do not describe in detail.
In addition, it should be understood by one skilled in the art that the accompanying drawing provided at this is all for illustrative purposes, and accompanying drawing is not necessarily drawn in proportion.
Fig. 1 is the schematic flow sheet of the coding method of digital media file according to the embodiment of the present invention, and the first digital media file (i.e. the digital media file of standard) is encapsulated as the second digital media file by this coding method.In the present embodiment, this coding method is applied to the propelling movement end of digital media file, such as video website, Network TV Station etc.Packed digital media file is standard digital media file, and such as, in Audiotechnica field, standard digital media file comprises WAVE, MP3, OGG, WMA, APE, FLAC.In high-definition video technology, standard digital media file comprises TS, AVI, MKV, MOV.The coding method of this digital media file comprises:
In step S101, according to predetermined coded system, the intermediate code file that preliminary treatment obtains is carried out to the first digital media file.
Wherein, the first digital media file is standard digital media file, such as rmvb file, fly file, swf file, TS stream file, mp3 file, ASF file etc.Coded system can be the operation being fixed variable, or the position of regular length is exchanged, or any algorithm first digital media file being carried out to form and/or formal transformation such as xor operation.
In step S102, preliminary treatment agreement is become the second digital media file with intermediate code Piece file mergence.Wherein, preliminary treatment agreement comprises identification code, address instruction and type of coding.
Intermediate code file is positioned at the body region of the second digital media file, and preliminary treatment agreement is positioned at the protocol information district of the second digital media file.Before protocol information district is positioned at body region or afterwards.
Identification code is default immobilized substance, for identifying preliminary treatment agreement.Such as, the length of identification code is 16 bytes, and its particular content is 0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x00.Again such as, the length of identification code is 8 bytes, and its particular content is 0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08.
Address instruction is used to indicate the address of body region.The content of address instruction can be the initial address of body region; Also can be the length in protocol information district, Play System can calculate the initial address of body region according to the length in protocol information district.
Type of coding is used to indicate the predetermined coded system in step S101.Such as, type of coding is 0x00, represents that the coded system in step S101 is the operation the first digital media file being fixed to variable; Type of coding is 0x01, represents that the coded system in step S101 is the first digital media file is carried out to the position exchange of regular length; Type of coding is 0x02, represents that coded system in step S101 is for carry out xor operation to the first digital media file.At broadcasting end, corresponding decoding process can be determined by recognition coding type.
By the Reseal to standard digital media file, common Play System cannot play-over the digital media file after encapsulation.Such as in the client of Web TV, if there is no corresponding Play System, cannot direct viewing Web TV, protect the copyright of Web TV.
Fig. 2 is the schematic block diagram of the code device of digital media file according to the embodiment of the present invention.This code device is applicable to the propelling movement end of digital media file, for encapsulating the digital media file of standard, such as, is RMVB file, FLY file, SWF file, TS stream file, mp3 file, ASF file etc.This code device comprises: the first storage device 101, first coding module 102, second coding module 103, the 3rd coding module 104 and the second storage device 105.
First storage device 101 is for obtaining and storing the first digital media file.Preferably, the first digital media file is the digital media file of standard.
First coding module 102 obtains the first digital media file from the first storage device 101, encodes to the first digital media file, to obtain intermediate code file.In the present embodiment, the first coding module 102 carries out xor operation to obtain intermediate code file to the first digital media file.
Second digital media file for preliminary treatment agreement is become the second digital media file with intermediate code Piece file mergence, and is provided to the second storage device 105 by the second coding module 103.
Second digital media file comprises body region and protocol information district, is respectively used to deposit intermediate code file and preliminary treatment agreement.
Preliminary treatment agreement comprises identification code, address instruction and type of coding.Identification code is used to indicate preliminary treatment agreement, and identification code is immobilized substance, and such as identification code is 0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08.Address instruction is used to indicate the address of body region, and type of coding is for identifying predetermined coded system, and in the present embodiment, type of coding is such as 0x02.
Fig. 3 is the schematic flow sheet of the coding/decoding method of digital media file according to the embodiment of the present invention.Digital media file to be played is the digital media file of standard or the digital media file that encapsulated.The coding/decoding method of this digital media file comprises:
In step S201, obtain the first digital media file.First digital media file is the digital media file of standard or the digital media file that encapsulated.
In step S202, check whether the fixed position of the head of the first digital media file or the fixed position of afterbody comprise identification code.Alternatively, the content of the first digital media file can be traveled through, thus search identification code.If the first digital media file comprises identification code, then enter step S203; If the first digital media file does not comprise identification code, then enter step S206, play-over the first digital media file.
In step S203, read the address instruction in the protocol information district of the first digital media file, obtain the address of the body region of the first digital media file.
In step S204, the first digital media file is divided into intermediate code file and preliminary treatment agreement.Wherein, intermediate code file comprises through pretreated second digital media file of predetermined coded system, and the second digital media file is the digital media file of standard.
In step S205, obtain corresponding decoding process according to type of coding, decode to obtain the second digital media file to middle coded file.The content of such as type of coding is 0x02, shows that be xor operation when encapsulating to the coded system of the second digital media file.
In step S206, the digital media file of playing standard.
Fig. 4 is the schematic block diagram of the decoding device of digital media file according to the embodiment of the present invention.The decoding device of digital media file comprises: storage device 201, resolver 202, first decoder module 203, second decoder module 204 and shunting device 205.
Storage device 201 is for obtaining and storing the first digital media file.
Resolver 202 obtains the first digital media file from storage device 201 and checks whether the fixed position of the head of the first digital media file or the fixed position of afterbody comprise identification code.Alternatively, the content of the first digital media file can be traveled through, thus search identification code.First decoder module 203, according to preliminary treatment agreement, is decoded to the first digital media file, to generate the second digital media file.Wherein, preliminary treatment comprises: according to the identification code in preliminary treatment agreement, judges whether the first digital media file comprises body region and protocol information district; According to the address instruction in preliminary treatment agreement, obtain the address of body region in the first digital media file; According to described address, the first digital media file is divided into intermediate code file and preliminary treatment agreement, wherein intermediate code file is positioned at the body region of the first digital media file, and preliminary treatment protocol package is containing the protocol information district being positioned at the first digital media file; And according to the type of coding in preliminary treatment agreement, decode to obtain the second digital media file to middle coded file.
Second digital media file is decoded as standard digital media file by the second decoder module 204.
Shunting device 205 is connected between resolver 202 and the second decoder module 204, for the first digital media file not comprising identification code is directly provided to the second decoder module 204.
Coding method of the present invention and code device, by encryption encapsulation, the digital media file after making common Play System cannot play-over encapsulation, can protect the copyright of digital media file better.Coding/decoding method of the present invention and decoding device provide the method and apparatus playing the described digital media file encapsulated.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant.Aforesaid program can store with a computer read/write memory medium.This program, when performing, performs the step comprising said method embodiment; And signature storage medium comprise: ROM, RAM or CD etc. various can be program code stored medium.Last it is noted that above embodiment is only for illustration of technical scheme of the present invention, but not be limited; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (16)
1. a coding method for digital media file, comprising:
First digital media file is encoded, to obtain intermediate code file; And
Preliminary treatment agreement is become the second digital media file with intermediate code Piece file mergence,
Wherein, the second digital media file comprises body region and protocol information district, is respectively used to deposit intermediate code file and preliminary treatment agreement,
Described preliminary treatment agreement comprises multiple byte, indicate identification code, address instruction and type of coding respectively, described identification code is used to indicate protocol information district, and the instruction of described address is used to indicate the address of described body region, and described type of coding is for knowing the coded system of described intermediate code file.
2. coding method according to claim 1, wherein, described coding comprise be selected from xor operation, be fixed variable operation, regular length position exchange at least one.
3. coding method according to claim 1, wherein, described in be encoded to User Defined coding.
4. coding method according to claim 1, wherein, described first digital media file is standard digital media file, and described second digital media file is the digital media file of Reseal.
5. coding method according to claim 1, wherein, before or after described protocol information district is positioned at described body region.
6. coding method according to claim 1, wherein, described identification code is immobilized substance.
7. coding method according to claim 1, wherein, described address is designated as the address of described body region.
8. coding method according to claim 1, wherein, described address is designated as the length in described protocol information district.
9. a code device for digital media file, comprising:
First and second storage devices, are respectively used to storage first digital media file and the second digital media file;
First coding module, obtains the first digital media file from the first storage device, encodes to the first digital media file, to obtain intermediate code file; And
Second coding module, preliminary treatment agreement is become the second digital media file with intermediate code Piece file mergence, second digital media file comprises body region and protocol information district, be respectively used to deposit intermediate code file and preliminary treatment agreement, and the second digital media file is provided to the second storage device.
10. a coding/decoding method for digital media file, comprising:
Resolve the first digital media file, to obtain the identification code of preliminary treatment agreement;
According to preliminary treatment agreement, the first digital media file is decoded, to generate the second digital media file; And
Second digital media file is decoded as standard digital media file.
11. coding/decoding methods according to claim 10, also comprise:
When described first digital media file does not comprise described identification code, the first digital media file is decoded as standard digital media file.
12. according to the coding/decoding method described in claim 0, wherein carries out decoding to the first digital media file and comprises:
According to the identification code in preliminary treatment agreement, judge whether the first digital media file comprises body region and protocol information district;
According to the address instruction in preliminary treatment agreement, obtain the address of body region in the first digital media file;
According to described address, the first digital media file is divided into intermediate code file and preliminary treatment agreement, wherein intermediate code file comprises body region content, and preliminary treatment protocol package is containing preliminary treatment protocol contents; And
According to the type of coding in preliminary treatment agreement, decode to obtain the second digital media file to middle coded file.
13. coding/decoding methods according to claim 12, wherein decoding process comprise be selected from xor operation, subtract fixed variable operation, regular length position exchange at least one.
14. coding/decoding methods according to claim 12, wherein, described decoding process is for decoding according to User Defined coding.
The decoding device of 15. 1 kinds of digital media files, comprising:
Storage device, stores the first digital media file;
Resolver, resolves the first digital media file, to obtain the identification code of preliminary treatment agreement;
First decoder module, according to preliminary treatment agreement, decodes to the first digital media file, to generate the second digital media file; And
Second decoder module, decodes the second digital media file as standard digital media file.
16. decoding devices according to claim 15, also comprise:
Shunting device, is connected between resolver and decoder module, for when described first digital media file does not comprise described identification code, the first digital media file is directly provided to decoder module.
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| CN201510509098.8A CN105100820B (en) | 2015-08-18 | 2015-08-18 | Coding method, coding/decoding method, code device and the decoding apparatus of digital media file |
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| CN201510509098.8A CN105100820B (en) | 2015-08-18 | 2015-08-18 | Coding method, coding/decoding method, code device and the decoding apparatus of digital media file |
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| CN105100820B (en) | 2019-05-03 |
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