CN100581249C - Encoding and decoding method for protecting stream medium video content copyright - Google Patents
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Abstract
The present invention relates to a method for the coding and decoding in the copyright protection of a stream media video content, belonging to the technical field of video content copyright protection. The method comprises the following steps of coding, discrete cosine transforming, quantifying, scrambling, and entropy coding the acquired video content, and generating and encrypting a 3GP document; obtaining a PDCF document and an SDP document by adding an encryption algorithm title, a video content identifier, video content authority publisher address information, and an index box, and dispatching the PDCF document and the SDP document in a manner of an RTP data packet. A streaming media client resolves the RTP packet to obtain and decrypt a video frame, and obtains RGB data or YUV data through entropy decoding, inverse scrambling, inverse quantifying and inverse discrete cosine transforming. The method has the advantages that the method enables the decrypted video content to be in the information fuzzy state as before by scrambling, transforming and encrypting a DCT coefficient; the copyright protection of the video content is strengthened; the interactivity of the streaming media and the application terminal in the system is enhanced through the custom information, and the safety of the system is improved.
Description
Technical field
The present invention relates to the Code And Decode method in a kind of streaming media video content copyright protection, belong to video content copyright protection technology field.
Background technology
It is a kind of effective means that the convection current media application is carried out copyright protection that video content is carried out encipherment protection.Yet the video stream media application system is made up of a plurality of modules, and present video content protection mode is single, and general provides protection to certain module, and considers at whole system.The safeguard measure of each module is also perfect not enough in the video stream media application system, these problems occur and is caused by following difficulty:
(1) at present video content being carried out encipherment protection all adopts superencipherment to separate Data Encryption Standard (hereinafter to be referred as AES) cryptographic algorithm; mainly be because aes algorithm has very high strength to exhaustive attack, known plain text attack and selection plaintext attack, make video encryption system have higher fail safe.It is the integral multiple of its basic encryption unit that but AES requires encrypted data chunk, and the content frame size is unfixed, thereby existing video content protection method all adopts safe class to hang down the part cryptographic algorithm of some.
(2) because streaming media server is the video data encoder of standard after sending to the video requency frame data deciphering of application end, if the application end data that are present in the internal memory are copied by the disabled user, the normal video frame data decoding that the disabled user can copy is play.
For above-mentioned reasons; protection to video content in the streaming media video application system is a systematic procedure; the fail safe of any one protection module all may become the bottleneck of security of system, and the fail safe that puts undue emphasis on individual module can not provide the safety of whole system.Have only that the fail safe of each module is guaranteed in the system, in the streaming media video application system to just success at last of the protection of video content.And existing solution all is to consider the fail safe of certain module in the video content protection system, and also imperfection of guard method scheme, has potential safety hazard.
Summary of the invention
The objective of the invention is to propose the Code And Decode method in a kind of streaming media video content copyright protection; video content is effectively controlled from frame coding, frame encryption, the transmission of RTP bag, application end deciphering and the whole process of frame decoding, finally reached the purpose that original video content is protected.
Code And Decode method in the streaming media video content copyright protection that the present invention proposes may further comprise the steps:
(1) video content that collects is encoded, obtain dct coefficient matrix A, and matrix A is carried out quantization operation obtain matrix B, matrix B is carried out the scramble conversion obtain Matrix C, Matrix C is carried out entropy coding, generate frame of video H, a plurality of frame of video that successively generate are generated 3GP file T according to the 3GP container standard;
(2) according to the control information among the above-mentioned 3GP file T, calculate the big or small s of each frame of video H respectively, s is carried out mould b computing, b is the size of cryptographic block in the superencipherment deciphering canonical algorithm, if result of calculation w is not 0, then fill b-w+b byte,, then fill b byte if result of calculation w is 0 at the corresponding video End of Frame, byte of padding is initialized as 0, and in the end write down byte number b-w+b or the b that fills in the b byte, and obtaining 3GP file T ', the frame of video behind the byte of padding is H ';
(3) adopt the difficult algorithm of superencipherment deciphering mark that frame of video H ' is encrypted, obtain 3GP file T ", frame of video H ' is converted into H after encrypting ";
(4) to above-mentioned 3GP file T " in add cryptographic algorithm title, video content identifier and video content rights issuer address information; the drm content formatted file P that obtains packing; in file P, add custom instruction; with the index box of the transmission means that constitutes explanation media stream in real time transmission format protocol packet, the drm content formatted file P ' of the packing that supported Streaming Media is used;
(5) the drm content formatted file P ' with above-mentioned packing is input to streaming media server, streaming media server takes out relevant field from above-mentioned file P ', obtain the Session Description Protocol file, streaming media server is after receiving user's displaying video content requests, above-mentioned file P ' is packed, obtain meeting first kind of packet of RTP form, simultaneously to above-mentioned Session Description Protocol file packing, obtain meeting second kind of packet of RTP form, and first kind of packet and second kind of packet are sent to the Streaming Media client;
(6) the Streaming Media client unpacks the above-mentioned packet that receives, obtain the frame of video H of above-mentioned encryption " and above-mentioned cryptographic algorithm title; according to the cryptographic algorithm title to H " deciphering, obtain frame of video H ', the byte of padding number that comprises in last b the byte according to frame of video H ', remove byte of padding, obtain frame of video H;
(7) above-mentioned frame of video H is carried out and the decoding of the corresponding entropy of above-mentioned entropy coding, obtain Matrix C, the Matrix C random conversion that is inverted, obtain matrix B, matrix B is carried out inverse quantization, obtain matrix A ', to matrix A ' carry out inverse discrete cosine transformation, obtain video data, be used for video playback.
Code And Decode method in the streaming media video content copyright protection that the present invention proposes has the following advantages:
(1) by a kind of encryption technology based on discrete cosine transform (hereinafter to be referred as DCT) coefficient scramble; still be in the information fuzzy state after the video content deciphering in the streaming media video application system of employing this method; therefore video content is played the effect of protection, strengthened the copyright protection of video content.And traditional video-encryption algorithm only adopts aes algorithm that video content is encrypted, and data still are subjected to the threat of illegal piracy after the decryption of video.
(2) in this method, after by high-level data encrypting and decrypting standard video frame content being encrypted fully, video content has reliable fail safe.Owing to comprised the self-defined information that to specify multiple encryption algorithms in the drm content form (hereinafter to be referred as PDCF) of packing, make the variation of system encryption policy selection, strengthened the interactivity of Streaming Media and application end in the system, the fail safe that improved system simultaneously.
Description of drawings
Fig. 1 is the theory diagram of the inventive method.
Fig. 2 is the FB(flow block) of encoding in the inventive method.
Fig. 3 is the FB(flow block) of decoding in the inventive method.
Embodiment
Code And Decode method in the streaming media video content copyright protection that the present invention proposes, its theory diagram may further comprise the steps as shown in Figure 1:
1, the video content that collects is encoded, generate dct coefficient matrix A, and matrix A is carried out quantization operation obtain matrix B, matrix B is carried out the scramble conversion with the macro block data of fixed size obtain Matrix C, according to the standard entropy coding schedule C is carried out entropy coding, generate frame of video H, a plurality of frame of video of using the instrument Yamb MP4Tools that increases income successively to generate generate 3GP file T according to the 3GP container standard.
2, according to the control information among the above-mentioned 3GP file T, calculate the big or small s of each frame of video H respectively, s is carried out mould b computing, b is the size that superencipherment is separated cryptographic block in Data Encryption Standard (AES) algorithm, if result of calculation w is not 0, then fill b-w+b byte,, then fill b byte if result of calculation w is 0 at the corresponding video End of Frame.Byte of padding is initialized as 0, and the byte number b-w+b or the b of first byte records filling of b byte in the end, obtains 3GP file T ', and the frame of video behind the byte of padding is H '.
In one embodiment of the invention, the process of size of calculating each frame of video H is as follows: the sfopen T that opens file, successively read in 4 bytes in variable boxsize and variable boxname, content among the comparison variable boxname and character string moov, if do not match, then file pointer is moved forward boxsize-8 byte, successively read in 4 bytes in variable boxsize and variable boxname again, this process that always circulates is up to variable boxname and character string moov coupling.This moment, file pointer pointed to moov box (hereinafter to be referred as Box) absolute position hereof.Successively read in 4 bytes in variable boxsize and variable boxname, content among the comparison variable boxname and character string trak, if do not match, then file pointer is moved forward boxsize-8 byte, successively read in 4 bytes in variable boxsize and variable boxname again, this process that always circulates is up to variable boxname and character string trak coupling.This moment, file pointer pointed to the physical address of first track (hereinafter to be referred as track) among the file T, and it is saved among the long variable track_loc, simultaneously with the content replication of variable boxsize in variable track_size.This is sought the process of specifying Box is applied among searching mdia, the hdlr Box.After this process finishes, pointer will point to hdlr Box, and with 8 bytes of file pointer reach, to skip field version and the field pre_defined among the hdlr Box, wherein field version and field pre_defined account for 4 bytes respectively.Read in 4 bytes to variable trak_type.And comparison variable trak_type and vide character string.If equate, then video track has been found in explanation, the current file pointer is composed to variable track_loc, otherwise file pointer is moved on to the document location of this track_loc appointment, skip track_size-8 byte, and carry out the next round comparison, up to finding video track, file pointer will be positioned on the video track position this moment.
After having located video track, method according to positioning video track, can locate stco Box, only make the nested trak of Box, mdia and hdlr in the positioning video track process into mdia, minf, stbl and stco, when variable boxname content and character string stco coupling, return the file pointer that points to stco Box position.
Successively read in 4 bytes in variable conversion and variable cocount, create cocount chunkoffset class example.Wherein the chunkoffset class comprises the 1st section (hereinafter to be referred as sample) long absolute position chunkloc hereof among integer field chunkID and the chunk.Read in the chunkID field of 1 chunkoffset example of 4 bytes to the, read in then among the member variable chunkloc of 1 chunkoffset example of file location information to the of 4 bytes.With the above-mentioned process circulation of reading in variable chunkID and variable chunkloc cocount time, then the data block of 8*cocount byte (hereinafter to be referred as chunk) information has all deposited in cocount the chunkoffset example in the file.
According to the method for location stco Box, can locate stsz Box.Only make the nested mdia of Box, minf, stbl and stco in the positioning video stco process into mdia, minf, stbl and stsz, when variable boxname content and character string stsz coupling, return the file pointer that points to stsz Box position.Read in 4 bytes then respectively in variable szversion, variable szsize and variable szcount, and the establishment size is the long array frame of szcount.The content of reading in 4 bytes is in the 1st element of array frame, and with this process circulation szcount time.After process finishes, stored the size information of all frame of video in this 3GP file in the frame array according to the order of sequence.
According to the method for location stco Box, can locate stsd Box.Only make the nested mdia of Box, minf, stbl and stco in the positioning video stco process into mdia, minf, stbl and stsd, when variable boxname content and character string stsd coupling, return the file pointer that points to stsd Box position.Read in 4 bytes respectively to variable version and variable entry_count.Create entry_count class SampleEntry object.The SampleEntry object mainly comprises member variable width and the member variable height that represents resolution sizes, the member variable frame_count that represents to have among each sample how many frames.With file pointer 12 bytes that move forward, to skip reserve bytes.Read in respectively again among the member variable width and member variable height of 1 SampleEntry object of 2 bytes to the.With file pointer 12 bytes that move forward, read in then among the member variable frame_count of 1 SampleEntry object of 2 byte content to the, 8 bytes that again file pointer moved forward are to skip irrelevant information, and this is read the information process circulation entry_count time, the information that then includes how many frame of video in the file among each sample just is kept in the SampleEntry object array.
According to the method for location stco Box, can locate stsc Box.Only make the nested mdia of Box, minf, stbl and stco in the positioning video stco process into mdia, minf, stbl and stsc, when variable boxname content and character string stsc coupling, return the file pointer that points to the stsc position.Successively read in 4 bytes in variable scversion, variable sccount and create the example of sccount chunk_sample_frame type.Type chunk_sample_frame has individual field, stores the frame number that contains sample among chunk absolute position hereof and each chunk respectively.Successively read among the member variable first_chunk and member variable samples_per_chunk of 1 chunk_sample_frame object of information to the of 4 bytes, and with this process circulation sccount time.Process has been stored the absolute position of chunk in this 3GP file and the frame number information that each sample comprises after finishing according to the order of sequence in the chunk_sample_frame example.Create new Type C hunk_frame.Comprise 3 fields in the Chunk_frame class, be respectively ID number of chunk, the frame number that comprises among the initial physical address of chunk, the chunk.The sample number information that contains according to each chunk that has in frame number information that comprises among each sample that has in the SampleEntry type array and the chunk_sample_frame array, what frames can calculate has among each chunk, and saves the data in the frameNum field of chunk_frame.So far, preserved all information of chunk in the chunk_frame array, comprised ID number of chunk, the frame number that comprises among the initial physical address of chunk, the chunk.Just can accurately locate each frame absolute position hereof by chunk_frame array and array frame.
3, adopt superencipherment deciphering canonical algorithm that frame of video H ' is encrypted, obtain 3GP file T ", frame of video H ' is converted into H ".
4, to above-mentioned 3GP file T " in add cryptographic algorithm title, video content identifier and video content rights issuer address information; the drm content formatted file P that obtains packing; in file P, add custom instruction; with the index box of the transmission means that constitutes explanation media stream in real time transmission format protocol packet, the drm content formatted file P ' of the packing that supported Streaming Media is used.The specific implementation process is:
Abide by ISO IEC 14496-12 standard and in the 3GP file, add sinf Box information.Follow 3GPP TS 26.244700 and ISO IEC 14496-12 standard design sinf Box, its content mainly comprises cryptographic algorithm title, video content identifier and video content rights issuer address information.Fopen opens T ", follow in the ISO IEC 14496-12 standard about the definition of meta Box and adopt the method search T of above-mentioned location Box " in meta Box.If T " in do not have meta Box, then file pointer is pointed to EOF, add the byte information that comprises meta Box and sub-Box sinf Box thereof according to 3GPP TS 26.244 700 and ISO IEC 14496-12 standard.If T " in contain meta Box; then read meta Box information in temporary variable t; self-defined information cryptographic algorithm title, video content identifier and video content rights issuer address information are added among the sinf Box according to the method for above-mentioned location Box, and will use t to cover T " in original meta Box information.By to above-mentioned 3GP file T " in add cryptographic algorithm title, video content identifier and video content rights issuer address information, obtained drm content form (PDCF) the file P of packing; By the use instrument QuickTime fluidisation function of increasing income, generate the file P ' that comprises index (hereinafter to be referred as hint) Box, hint Box is made of the index information of the audio frequency and video in the moov Box among the file P, is used to support the stream of streaming media server to use.
5, streaming media server is analyzed the drm content form P ' of above-mentioned packing, obtains Session Description Protocol file (SDP).After streaming media server receives the displaying video content requests, drm content formatted file P ' to above-mentioned packing packs, obtain real-time transport protocol (rtp) formatted data bag, simultaneously session is described document of agreement and also be packaged into RTP formatted data bag, and these packets are sent to the Streaming Media client.
6, the Streaming Media client is from the above-mentioned RTP formatted data bag that receives, parse the frame H after the encryption " and the cryptographic algorithm title; adopt superencipherment deciphering canonical algorithm to H " deciphering, obtain frame of video H ', calculate the byte of padding number according to the 1st byte content in last b the byte of frame of video H ', remove the byte of padding of postamble portion, obtain frame of video H.
7, above-mentioned frame of video H is carried out entropy decoding, obtain Matrix C, the Matrix C random conversion that is inverted, obtain matrix B, matrix B is carried out inverse quantization, obtain matrix A ', to matrix A ' carry out inverse discrete cosine transformation, obtain the RGB or the yuv data that can be used for playing, be directly used in video playback.
Claims (1)
1, the Code And Decode method in a kind of streaming media video content copyright protection is characterized in that may further comprise the steps:
(1) video content that collects is encoded, obtain dct coefficient matrix A, and matrix A is carried out quantization operation obtain matrix B, matrix B is carried out the scramble conversion obtain Matrix C, Matrix C is carried out entropy coding, generate frame of video H, a plurality of frame of video that successively generate are generated 3GP file T according to the 3GP container standard;
(2) according to the control information among the above-mentioned 3GP file T, calculate the big or small s of each frame of video H respectively, s is carried out mould b computing, b is the size of cryptographic block in the superencipherment deciphering canonical algorithm, if result of calculation w is not 0, then fill b-w+b byte,, then fill b byte if result of calculation w is 0 at the corresponding video End of Frame, byte of padding is initialized as 0, and in the end write down byte number b-w+b or the b that fills in the b byte, and obtaining 3GP file T ', the frame of video behind the byte of padding is H ';
(3) adopt superencipherment deciphering canonical algorithm that frame of video H ' is encrypted, obtain 3GP file T ", frame of video H ' is converted into H after encrypting ";
(4) to above-mentioned 3GP file T " in add cryptographic algorithm title, video content identifier and video content rights issuer address information; the drm content formatted file P that obtains packing; in file P, add custom instruction; with the index box of the transmission means that constitutes explanation media stream in real time transmission format protocol packet, the drm content formatted file P ' of the packing that supported Streaming Media is used;
(5) the drm content formatted file P ' with above-mentioned packing is input to streaming media server, streaming media server takes out relevant field from above-mentioned file P ', obtain the Session Description Protocol file, streaming media server is after receiving user's displaying video content requests, above-mentioned file P ' is packed, obtain meeting first kind of packet of RTP form, simultaneously to above-mentioned Session Description Protocol file packing, obtain meeting second kind of packet of RTP form, and first kind of packet and second kind of packet are sent to the Streaming Media client;
(6) the Streaming Media client unpacks the above-mentioned packet that receives, obtain the frame of video H of above-mentioned encryption " and above-mentioned cryptographic algorithm title; according to the cryptographic algorithm title to H " deciphering, obtain frame of video H ', the byte of padding number that comprises in last b the byte according to frame of video H ', remove the byte of padding of frame of video H ' afterbody, obtain frame of video H;
(7) above-mentioned frame of video H is carried out and the decoding of the corresponding entropy of above-mentioned entropy coding, obtain Matrix C, the Matrix C random conversion that is inverted, obtain matrix B, matrix B is carried out inverse quantization, obtain matrix A ', to matrix A ' carry out inverse discrete cosine transformation, obtain video data, be used for video playback.
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| IL199486A0 (en) * | 2009-06-22 | 2011-08-01 | Nds Ltd | Partial encryption using variable block-size parameters |
| CN103136459B (en) * | 2013-01-09 | 2018-12-21 | 上海威客网络科技有限公司 | A kind of copyright method and system of encrypted digital content |
| CN104661082A (en) * | 2015-02-04 | 2015-05-27 | 深圳创维数字技术有限公司 | Program source data protecting method and relating devices |
| CN105100820B (en) * | 2015-08-18 | 2019-05-03 | 杭州士兰微电子股份有限公司 | Coding method, coding/decoding method, code device and the decoding apparatus of digital media file |
| CN106649411B (en) * | 2015-11-04 | 2019-12-06 | 青岛伟东云教育集团有限公司 | courseware making and analyzing device and method |
| CN108632282A (en) * | 2018-05-10 | 2018-10-09 | 句容市百事特复合材料有限公司 | Image and video safe transmission method based on image library |
| CN109462469A (en) * | 2018-11-13 | 2019-03-12 | 常熟理工学院 | Based on arrangement and displaced network flow-medium information security encryption method and system |
| CN114727157B (en) * | 2022-03-31 | 2022-11-15 | 慧之安信息技术股份有限公司 | Video encryption and decryption method and system based on platform |
| CN117395474B (en) * | 2023-12-12 | 2024-02-27 | 法序(厦门)信息科技有限公司 | Locally stored tamper-resistant video evidence obtaining and storing method and system |
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