CN100525447C - Audio-video frequency media data organization realizing method of supporting precision positioning - Google Patents
Audio-video frequency media data organization realizing method of supporting precision positioning Download PDFInfo
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- CN100525447C CN100525447C CN 200510127655 CN200510127655A CN100525447C CN 100525447 C CN100525447 C CN 100525447C CN 200510127655 CN200510127655 CN 200510127655 CN 200510127655 A CN200510127655 A CN 200510127655A CN 100525447 C CN100525447 C CN 100525447C
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Abstract
The method includes (1) traversing entire stream file of AVS program, building indexing information for all I frames, adding the indexing information to the end of the stream file of AVS program, and loading the indexing information before playing back AVS program stream; (2) based on operations such as fast locating, scene jumping, and quick dragging operations carried out by user to determine position and time of playing point; (3) using same proportion search method to find out PS packet containing I frame nearest to the playing point so as to find out initial position and timestamp of PS packet in AVS program stream file; (4) based on time and position of I frame of playing point, system locates relevant position of the AVS program stream automatically and carries out playing back operation. Advantages are: solving pinpoint issue, and guaranteeing standard AVS program stream.
Description
Technical field
The present invention relates to a kind of relevant AVS media playing method of digital audio/video encoding and decoding standard that is used for areas of information technology, refer to that especially a kind of realization can pinpoint AVS media data playing method.
Background technology
The digital audio/video encoding and decoding standard is the general character basic standard of digital audio/video industry, has huge industry demand.At five to ten years of future, (high definition) Digital Television industry of China, high density compact disc industry, wideband multimedia application and 3G (Third Generation) Moblie industry became the important industry group who influences national economy with extensive high speed development.The 2008 Beijing Olympic Games will become the milestone of high definition television broadcasting and mobile multimedia application.
China digital audio/video encoding and decoding technique standard A VS (Audio Video codingStandard) that formulates that takes the lead has represented current international most advanced level.The AVS standard is that the digital audio/video industry chain (supply chain) of China's structure " technology → patent → standard → chip and software → complete machine and system's manufacturing → Digital Media operation and cultural industry " provides important opportunity.
The decoding of audio-video frequency media and broadcast are the piths of digital audio/video encoding and decoding technique standard, also are that the user uses maximum parts.Realize a kind of can having great importance for the industrialization that promotes AVS by pinpoint audio-video frequency media Play System.And at present, also do not have the pinpoint AVS media data playing method of a kind of realization.
Because AVS program stream (PS) file is made up of the bag of PS (program stream Program Stream) one by one, the PTS (PresentationTime Stamp) during audio video synchronization is wrapped by PES (Packetized Elementary Stream) finishes.Contain PTS in the PES bag that has, and do not have in the bag that has.Because PTS is a linear growth, and the code check of video sequence alters a great deal, and causes PTS to be non-linear appearance in program stream.This locatees, realizes scene hop, drags and bring certain trouble fast just for file fast.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of be quick location, support scene hop that realizes the AVS program stream and the method that drags fast are provided.
The objective of the invention is to realize by the following technical solutions:
Support pinpoint audio-video frequency media data organization implementation method, comprise the steps:
1) the whole AVS program stream file of traversal is set up the index information of all I frames, and the end that this index information adds AVS program stream file to, is written into this index information in advance when playing the AVS program stream;
Wherein, the index information of setting up all I frames carries out as follows:
(1) index of definition item;
(2) definition AVS program stream file format adds the index marker symbol in original program stream end of file position;
(3) generate index entry;
2) according to the user locate fast, scene hop and operation such as drag fast, determine the position and the time of broadcast point;
3) according to step 2) in index information tabulation in the position of the broadcast point that obtains and the step 1), use search method in proportion to find bag, thereby find the PS at this I frame place to wrap in original position and timestamp (PTS) in the AVS program stream file from the PS at the nearest I frame place of broadcast point;
Wherein, described " using in proportion, search method finds from the nearest I frame of broadcast point " obtains by following steps:
(a) according to the position of broadcast point, system obtains approximate location and the time of this broadcast point in whole program stream;
(b) according to the approximate location that obtains in the step (a), in I frame index information list, find its approximate location according to same proportionate relationship, near this approximate location, find the most close index entry of time then;
(c) in step (b), find on the basis of index entry, directly from index entry, read position and the corresponding timestamp (PTS) of I frame in AVS program stream file;
4) according to the time and the position of the I frame of the broadcast point that obtains in the step 3), system navigates to the relevant position of AVS program stream automatically and plays.
Pinpoint AVS audio-video frequency media data organization of support provided by the invention and implementation method, by disposable traversal AVS program stream file in advance, set up the index file of I frame, on the basis of original program stream, at the ending place adding I of file frame index new range table; Then when being written into the AVS program stream at every turn, read in I frame index information list earlier, the user locate fast, scene hop and when operation such as dragging fast, system finds the I frame of broadcast point automatically in I frame index information, find the accurate position of this I frame in the AVS program stream, final system directly navigates to this position, and the PTS in the index of reference information realizes the synchronous playing of synchronized audio/video.
Compared with prior art, the invention has the advantages that:
The advantage of this method just is can disposable generation index information and be tied to the ending of program stream, both can solve pinpoint problem, guaranteed the standard of AVS program stream again, thereby function such as both can realize quick location, the scene hop of AVS program stream and drag fast in the broadcast that has accurate positioning function rises does not influence yet and does not support pinpoint broadcast to rise to play the AVS program stream simultaneously.Because index information and program stream are kept at together,, directly just can accurately navigate to corresponding position simultaneously according to accurate index information so need when each the broadcast, not travel through whole AVS program stream repeatedly.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Support pinpoint AVS audio-video frequency media data organization and implementation method, comprise the steps:
1) the whole AVS program stream file of traversal is set up the index information of all I frames, and the end that this index information adds AVS program stream file to, is written into this index information in advance when playing the AVS program stream; With the C Plus Plus is example, and " the setting up the index information of all I frames " in this step 1) carried out as follows: the definition of (1) index entry:
The Index information definition is as follows:
struct?INDEXINFO{
LONGLONG llFilePoint; The defined point of // index position hereof;
LONGLONG l lCurrPts; First timestamp Pts behind the // adjacent file pointer;
}
Require: FilePoint points to the position that PS unwraps the beginning, comprises the initial code of an I frame in this bag.
(2) AVS program stream file format definition: add Index identifier FFFF in original PS end of file position, end position is 000001FA, and Idx Num is UINT type data, is illustrated in the number of index in this document, and is as shown in the table.
| PS?File?Stream | FF?FF | Index?Table | Idx?Num | 00?00?01?FA |
PS File Stream is an AVS file program stream in last table, and FF FF is the hexadecimal identifier that index entry begins, and 000001FA is the hexadecimal uniform of a specific trade symbol that index entry finishes, and Idx Num is all index entry tabulations.
(3) generation of index entry: those skilled in the art can generate the process of index according to existing techniques in realizing, repeat no more herein, but requiring llFilePoint item in the index entry must be the original position of PS bag, have in the file much owing to containing wrapping in of PTS simultaneously, when setting up index, should limit (32 Idex_Num can represent that at most 232 is 4G index) to sum, and final index number is presented in the Idx_Num item.The generative process of index can be introduced key frame recognizer or scene Recognition algorithm etc., but llFilePoint should be the original position of the PS bag at the I frame place before this frame.
2) according to the user locate fast, scene hop and operation such as drag fast, determine the position and the time of broadcast point;
3), use in proportion that search method finds the bag from the PS at the nearest I frame place of broadcast point, thereby find the PS at this I frame place to wrap in original position and timestamp in the AVS program stream file according to index information tabulation in the position and 1 of the broadcast point that obtains in 2;
" using in proportion, search method finds from the nearest I frame of broadcast point " in the step 3) obtains by following steps herein: (1) according to the position of broadcast point, system obtains approximate location and the time of this broadcast point in whole program stream;
(2) according to the approximate location that obtains in 1, in I frame index information list, find its approximate location, near this approximate location, find the most close index entry of time then according to same proportionate relationship;
(3) in 2, find on the basis of index entry, can directly from index entry, read position and the corresponding timestamp of I frame in AVS program stream file;
4) according to the time and the position of the I frame of the broadcast point that obtains in 3, system navigates to the relevant position of AVS program stream automatically and plays.
The present invention has different implementations in different platform, present embodiment is an example with the framework of DirectShow Filter, this process is described, playing program comprises three DirectShow Filter:File Reader, PS Demuxer, AVS Video Decoder, and concrete steps are as follows:
(1) in the initialized while of program start, File Reader is read into the information in the index information (Index Content) in the chained list, obtains new zero-time (StartTime) when action takes place when dragging;
(2) PS Demuxer removes to look into chained list according to this zero-time (Start Time), in chained list, find with the immediate current time stamp of this zero-time (currPts), find new file original position according to this current timestamp then, notice File Reader Filter is from new position reading of data, simultaneously send out message to AVS DecoderFilter, drag events has taken place in notice
(3) AVS Video Decoder drags after the message when receiving, decoding suspends, and waits pending data; If the data that obtain are sealing GOP, and contain I frame initial code (00 00 01 B3), then throw away the front end hash and begin decoding; If the data that obtain are sealing GOP, but do not contain the I frame in the packet, perhaps the I frame data are incomplete, then wait pending data; If the data that obtain are open GOP, that is to say that the P frame of I frame back might be with reference to the P frame before the I frame, decoder begins decoding from first I frame of receiving so, just begins later on to show separating second I frame, during this, exports with blank screen.Because flower screen phenomenon may appear in open GOP after restarting decoding, in general, open GOP restarts after the decoding, and image can recover normal behind second GOP.
Utilize method of the present invention that 150 hours AVS program stream is tested, the result shows that audio frequency and video keep synchronously, and reaches zero-lag, has realized and can accurately locate, the AVS playing programs of function such as support location, scene hop fast and drag fast.
The present invention has realized the pinpoint AVS audio-video frequency media data organization of a kind of support method, have simple in structure, realize simple, location characteristics such as location accurately and fast.Experiment shows the AVS Play System that the method for utilizing the present invention to propose is built, and is very easy to browsing of program, can realize the accurately Play System of location and zero-lag.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1, supports pinpoint audio-video frequency media data organization implementation method, comprise the steps:
1) the whole AVS program stream file of traversal is set up the index information tabulation of all I frames, and the end that this index information adds AVS program stream file to, at first is written into this index information when playing the AVS program stream;
Wherein, the index information of setting up all I frames carries out as follows:
1-1. index of definition item;
1-2. definition AVS program stream file format adds the index marker symbol in original program stream end of file position;
1-3. generation index entry;
2) carry out rapid positioning operation, scene hop operation or quick drag operation according to the user, determine the position and the time of broadcast point;
3) according to step 2) in index information tabulation in the position of the broadcast point that obtains and the step 1), use search method in proportion to find program stream pack, thereby find original position and the timestamp of program stream pack in AVS program stream file at this I frame place from the nearest I frame place of broadcast point;
Wherein, described " using in proportion, search method finds from the nearest I frame of broadcast point " obtains by following steps:
3-1. according to the position of broadcast point, system obtains approximate location and the time of this broadcast point in whole program stream;
3-2. according to the approximate location that obtains in the step 1), in I frame index information list, find its approximate location, near this approximate location, find the most close index entry of time then according to same proportionate relationship;
3-3. in step 2) in find on the basis of index entry, directly from index entry, read position and the corresponding timestamp of I frame in AVS program stream file;
4) according to the time and the position of the I frame of the broadcast point that obtains in the step 3), system navigates to the relevant position of AVS program stream and plays.
2, according to the pinpoint audio-video frequency media data organization implementation method of the described support of claim 1, in DirectShow Filter framework, playing program comprises three DirectShow Filter:File Reader, PS Demuxer, AVS Video Decoder, and concrete steps are as follows:
(1) in the initialized while of program start, File Reader is read into the information in the index information in the chained list, obtains new zero-time when action takes place when dragging;
(2) PS Demuxer removes to look into chained list according to this zero-time, in described chained list, find with the immediate current time stamp of this zero-time, find new file original position according to this current timestamp then, notice FileReader Filter is from new position reading of data, simultaneously send out message to AVS Decoder Filter, drag events has taken place in notice;
(3) AVS Video Decoder drags after the message when receiving, decoding suspends, and waits pending data; If the data that obtain are sealing GOP, and contain I frame initial code, then throw away the front end hash and begin decoding; If the data that obtain are sealing GOP, but do not contain the I frame in the packet, perhaps the I frame data are incomplete, then wait pending data; If the data that obtain are open GOP, decoder just begins decoding from first I frame of receiving, just begins demonstration later on separating second I frame, during this, exports with blank screen.
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| CN 200510127655 CN100525447C (en) | 2005-12-07 | 2005-12-07 | Audio-video frequency media data organization realizing method of supporting precision positioning |
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| CN 200510127655 CN100525447C (en) | 2005-12-07 | 2005-12-07 | Audio-video frequency media data organization realizing method of supporting precision positioning |
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| CN100525447C true CN100525447C (en) | 2009-08-05 |
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Cited By (1)
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| US8875201B2 (en) | 2008-03-19 | 2014-10-28 | Huawei Technologies Co., Ltd. | Method, device and system for implementing seeking play of stream media |
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| CN108737874A (en) * | 2018-06-05 | 2018-11-02 | 武汉斗鱼网络科技有限公司 | A kind of video broadcasting method and electronic equipment |
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-
2005
- 2005-12-07 CN CN 200510127655 patent/CN100525447C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8875201B2 (en) | 2008-03-19 | 2014-10-28 | Huawei Technologies Co., Ltd. | Method, device and system for implementing seeking play of stream media |
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| CN1980390A (en) | 2007-06-13 |
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