CN101118777B - Playing method of multimedia container format file and indexes reading method thereof - Google Patents
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- CN101118777B CN101118777B CN2007101205973A CN200710120597A CN101118777B CN 101118777 B CN101118777 B CN 101118777B CN 2007101205973 A CN2007101205973 A CN 2007101205973A CN 200710120597 A CN200710120597 A CN 200710120597A CN 101118777 B CN101118777 B CN 101118777B
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Abstract
The present invention discloses a method for playing files with a multimedia container format (or MCF); and the method includes: an analysis file header, a decoder that is selected and configured according to the analysis content, and an index bias recording table for the index erection of an index part; wherein, the index bias recording table keeps a record of current read index bias; the size L of the index is read out and judged whether larger than the preset value S or not. In the event of being larger than the preset value S, the current read index bias position is taken as the index of the preset value S read from the index, and the latest read index bias is upgraded into the index bias recording table; otherwise, all indexes are read; multimedia data of the multimedia data part is read according to the read indexes, and the configured decoder decodes the read multimedia data, then the decoded multimedia data is played, in this way, the method can realize the display of relatively big-sized MCF files on the embedded equipment with limited resource.
Description
Technical field
The present invention relates to the multimedia file process field, relate in particular to a kind of player method and index read method of multimedia container formatted file.
Background technology
The basic format of multimedia file all is that information is not made process variations and direct-recording, and their common problems are exactly bulky.In order to reduce document size and the many-sided function of exploitation multimedia file, the multimedia container file form has appearred.For instance, the MOV file layout of the Quick Time that described multimedia container file form can be an Apple company, also can be AVI (the Audio VideoInterleave Audio Video Interleaved) file layout and ASF (the Advanced Streaming Format) file layout of Microsoft, and the file layout based on ISO (International Standard Organization ISO (International Standards Organization)) of MPEG employing, the 3GP file layout that 3GPP (3rd Generation Partnership Project third generation partner plan) tissue is recommended etc.
See also shown in Figure 1ly, described multimedia container file form generally all includes file header part, index part and multi-medium data part.Wherein, partly store multi-medium data through overcompression at multi-medium data, described multi-medium data comprises video data, voice data, text data and other multi-medium data, reduces document size like this.Defend oneself at top of file and to understand compression standard and the standardize information that multi-medium data meets, the compression standard that described multi-medium data meets can be MPEG (Moving Picture ExpertsGroup) series etc., MPEG series comprises three parts of MPEG video, mpeg audio and mpeg system (looking audio sync), the video encoding scheme that provides has MPEG-1,2,4, the VCD that we are familiar with adopts MPEG-1, and DVD has adopted the MPEG-2 video compression scheme.The standardize information that described multi-medium data meets can comprise resolution, the frame per second of video, the sampling rate of audio frequency etc.Described multi-medium data is divided into some by meeting, also may discontinuous storage between each blocks of data, therefore, need set up the memory location index of multi-medium data at described index part, as shown in Figure 2, it has shown video data storage location index and voice data storage location index in detail, it is used for writing down the storage location of the storage side-play amount of respective data blocks with the location multi-medium data, because the size of each data block may be different, therefore also may set up the size index of each multi-medium data piece at described index part, be used for writing down the size of respective data blocks.In addition, also may set up other various index,, for convenience, will be referred to as index at the various index that described index part is set up such as the audio-visual synchronization index etc. at described index part.When multimedia file was bigger, index part also was bigger, may reach about 10M when index part is the highest in the movie file of 100M.
Resolve on PC and when playing these multimedia container formatted files, common way is all to be put in the internal memory index is disposable, comes to obtain needed data by data directory according to operation (such as the skip forward/back of progress bar) then in broadcast.Yet, in embedded device because the broadcast of the multimedia file that resource limit such as its internal memory causes being difficult to supporting that well capacity is bigger.
Therefore, demand urgently proposing a kind of in the embedded device of resource-constrained the player method and the index read method of multimedia container formatted file.
Summary of the invention
The object of the present invention is to provide a kind of player method of multimedia container formatted file, can be implemented in by this method on the embedded device of resource-constrained and can play larger-size multimedia container formatted file.
Another object of the present invention is to provide a kind of index read method of multimedia container formatted file, index can be read on the embedded device of resource-constrained by this method and then realize the broadcast of multimedia container formatted file.
To achieve these goals, according to an aspect of the present invention, the player method of a kind of multimedia container formatted file provided by the invention, described multimedia container formatted file comprise file header part, index part and multi-medium data part, and this method comprises:
A, resolution file head part are according to resolving content choice and disposing demoder;
B, be the index construct index offset record sheet of described index part, described index offset record souvenir the current index offset that reads, currently read the initial value that index offset has setting;
C, read the size L of described index;
D, judge that whether described index size L is greater than predetermined value S;
E reads described predetermined value S size is read in the index offset position from described index index from current, and the up-to-date current index offset that reads is updated in the index offset record sheet if then; Otherwise, read whole index;
The index that F, basis have read reads the multi-medium data of multi-medium data part, utilizes the demoder that configures the multi-medium data that reads to be decoded the multi-medium data behind the broadcast decoder.
Further, it also comprises: in step e, if negative branch enters step F, finish so to play after step F; If positive branch enters step F, with L=L-S and return step D.
Further, steps A specifically comprises: the compression standard and the standardize information that obtain multi-medium data from the file header part; Select demoder and according to the standardize information configuration demoder of multi-medium data according to the compression standard of multi-medium data.
Further, described index offset record sheet comprises the size and the current index offset that reads of every batch of index that concordance list title, indexing head skew, index tail are offset, read.
Further, when the multimedia container formatted file has a plurality of index, need set up the index offset record sheet for each index, wherein the concordance list title is exactly the ownership that is used for showing described index offset record sheet, described indexing head skew and the skew of index tail are meant the reference position and the final position of manipulative indexing, be used for making comparisons with the current index offset that reads, the current setting initial value that reads index offset is exactly the reference position of index, the size of the described every batch of index that reads is exactly described predetermined value S, and described predetermined value S can set as required.
To achieve these goals, according to a further aspect in the invention, the index read method of a kind of multimedia container formatted file provided by the invention, it comprises:
A, be the index construct index offset record sheet that need read, described index offset record sheet has write down the current index offset that reads, and currently reads the initial value that index offset has setting;
B, read the size L of described index;
C, judge that whether described index size L is greater than predetermined value S;
D reads described predetermined value S size is read in the index offset position from described index index from current, and the up-to-date current index offset that reads is updated in the index offset record sheet if then; Otherwise, read whole index;
The index that E, basis have read reads the multi-medium data of multi-medium data part.
Further, in step D,, after step e, finish to read index so if negative branch enters step e; If positive branch enters step e, with L=L-S and return step C.
Further, described index offset record sheet comprises the size and the current index offset that reads of every batch of index that concordance list title, indexing head skew, index tail are offset, read.
Further, when the multimedia container formatted file has a plurality of index, need set up the index offset record sheet for each index, wherein the concordance list title is exactly the ownership that is used for showing described index offset record sheet, described indexing head skew and the skew of index tail are meant the reference position and the final position of manipulative indexing, be used for making comparisons with the current index offset that reads, the current setting initial value that reads index offset is exactly the reference position of index, the size of the described every batch of index that reads is exactly described predetermined value S, and described predetermined value S can set as required.
Compared with prior art, in the present invention, realize reading in batches index by writing down the current index offset that reads, and then realize the broadcast in the media player in the embedded device of limited resources of large-sized media container formatted file.
Description of drawings
Fig. 1 is the configuration diagram of multimedia container file form;
Fig. 2 is the audio, video data storage location index synoptic diagram of the data directory part of multimedia container file form;
Fig. 3 is the schematic flow sheet of an embodiment of the player method of multimedia container formatted file of the present invention;
Fig. 4 is the schematic flow sheet of an embodiment of the index read method of multimedia container formatted file of the present invention; With
Fig. 5 has shown the index offset record sheet in the index read method among the present invention.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is described.
Generally speaking, in the present invention, realize reading in batches index by writing down the current index offset that reads, and then realize the broadcast in the media player in the embedded device of limited resources of large-sized media container formatted file.
The multimedia container formatted file here comprises file header part, index part and multi-medium data part.Wherein, partly store multi-medium data at multi-medium data through overcompression.Defend oneself at top of file and to understand compression standard and the standardize information that multi-medium data meets, the compression standard that described multi-medium data meets can be a MPEG series etc., the standardize information that described multi-medium data meets can comprise resolution, the frame per second of video, the sampling rate of audio frequency etc.Set up the various index of multi-medium data at described index part, specifically can comprise memory location index, size index and audio-visual synchronization index etc.
Though can not playing this technical matters of large scale multimedia file owing to the embedded device resource-constrained, the technical scheme that the present invention proposes causes, but can not therefore limit the multimedia player that technical scheme of the present invention only is only applicable to embedded device, being applied to the so non-embedded equipment of PC also is fine fully, it can just may abundantly owing to the resource of PC make that the effect of this saving resource is little obvious for PC saves resource equally.
Please refer to Fig. 3, it shows the schematic flow sheet of an embodiment of the player method of multimedia container formatted file of the present invention, this player method is applied in the multimedia player of digital equipment, when needs were used this multimedia player and play a multimedia container formatted file, it comprised the steps.
Said process is carried out by multimedia player, detailed process can comprise: the compression standard and the standardize information that obtain multi-medium data from the file header part, the compression standard that described multi-medium data meets can be a MPEG series etc., the standardize information that described multi-medium data meets can comprise resolution, the frame per second of video, the sampling rate of audio frequency etc.; Select demoder and dispose corresponding demoder according to the compression standard of multi-medium data according to the standardize information of multi-medium data, if such as compression standard is MPEG4, can select the MPEG4 demoder so, if compression standard is for another example ..., can select so ... demoder.
At first need to read the index of the index part of multimedia container formatted file here.Because device resource possibility in multimedia player place is limited and the index size is very important, can not be with the disposable internal memory that reads in of index, as a kind of improvement in one embodiment of the invention, thus can note the current index offset that reads and realize index is read in batches.See also shown in Figure 4ly, it shows the schematic flow sheet of an embodiment of the index read method of the multimedia container formatted file that the present invention proposes, and it may further comprise the steps:
Whether step 22 judges described index size L greater than predetermined value S, if then change step 23 over to, if otherwise change step 24 over to;
Step 25 ', read multi-medium data according to the index that has read, and finish to read the index flow process;
In a preferred embodiment, described index offset record sheet as shown in Figure 5, size, the current index offset and the index record item parts of reading of every batch of index that it comprises the skew of concordance list title, indexing head, the skew of index tail, read.When the multimedia container formatted file has a plurality of index, need set up the index offset record sheet for each index, wherein the concordance list title is exactly the ownership that is used for showing described index offset record sheet.Described indexing head skew and the skew of index tail are meant the reference position and the final position of manipulative indexing, be used for making comparisons with the current index offset that reads, in general, the current setting initial value that reads index offset is exactly the reference position of index, and the current end value that reads index offset is exactly the final position of index.The size of the described every batch of index that reads is exactly the predetermined value S among the embodiment of front, and this S can set as required.Described index record item parts is used for storing each batch index record item of reading from index, is predetermined value S size at L during greater than S, is the L size at L during less than S.
Like this, just realized that in the present invention data directory reads in batches, thereby realized under the situation of resource-constrained, still realizing reading of index, and then realized reading and playing of multi-medium data.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. the player method of a multimedia container formatted file, described multimedia container formatted file comprise file header part, index part and multi-medium data part, it is characterized in that it comprises:
A, resolution file head part are according to resolving content choice and disposing demoder;
B, be the index construct index offset record sheet of described index part, described index offset record sheet has write down the current index offset that reads, and currently reads the initial value that index offset has setting;
C, read the size L of described index;
D, judge that whether described index size L is greater than predetermined value S;
E reads described predetermined value S size is read in the index offset position from described index index from current, and the up-to-date current index offset that reads is updated in the index offset record sheet if then; Otherwise, read whole index;
The index that F, basis have read reads the multi-medium data of multi-medium data part, utilizes the demoder that configures the multi-medium data that reads to be decoded the multi-medium data behind the broadcast decoder.
2. the player method of multimedia container formatted file as claimed in claim 1 is characterized in that, it also comprises: in step e, if negative branch enters step F, finish so to play after step F; If positive branch enters step F, with L=L-S and return step D.
3. the player method of multimedia container formatted file as claimed in claim 1 is characterized in that, steps A specifically comprises: the compression standard and the standardize information that obtain multi-medium data from the file header part; Select demoder and according to the standardize information configuration demoder of multi-medium data according to the compression standard of multi-medium data.
4. the player method of multimedia container formatted file as claimed in claim 1 is characterized in that, described index offset record sheet comprises the size and the current index offset that reads of every batch of index that concordance list title, indexing head skew, index tail are offset, read.
5. the player method of multimedia container formatted file as claimed in claim 4, it is characterized in that, when the multimedia container formatted file has a plurality of index, need set up the index offset record sheet for each index, wherein the concordance list title is exactly the ownership that is used for showing described index offset record sheet, described indexing head skew and the skew of index tail are meant the reference position and the final position of manipulative indexing, be used for making comparisons with the current index offset that reads, the current setting initial value that reads index offset is exactly the reference position of index, the size of the described every batch of index that reads is exactly described predetermined value S, and described predetermined value S can set as required.
6. the player method of multimedia container formatted file as claimed in claim 4 is characterized in that, described index offset record sheet also comprises the index record item parts, and described index record item parts is used for storing each batch index of reading from index.
7. the index read method of a multimedia container formatted file is characterized in that it comprises:
A, be the index construct index offset record sheet that need read, described index offset record sheet has write down the current index offset that reads, and currently reads the initial value that index offset has setting;
B, read the size L of described index;
C, judge that whether described index size L is greater than predetermined value S;
D reads described predetermined value S size is read in the index offset position from described index index from current, and the up-to-date current index offset that reads is updated in the index offset record sheet if then; Otherwise, read whole index;
The index that E, basis have read reads the multi-medium data of multi-medium data part.
8. the index read method of multimedia container formatted file as claimed in claim 7 is characterized in that, in step D, if negative branch enters step e, finishes to read index so after step e; If positive branch enters step e, with L=L-S and return step C.
9. the index read method of multimedia container formatted file as claimed in claim 7, it is characterized in that described index offset record sheet comprises the size and the current index offset that reads of every batch of index that concordance list title, indexing head skew, index tail are offset, read.
10. the index read method of multimedia container formatted file as claimed in claim 9, it is characterized in that, when the multimedia container formatted file has a plurality of index, need set up the index offset record sheet for each index, wherein the concordance list title is exactly the ownership that is used for showing described index offset record sheet, described indexing head skew and the skew of index tail are meant the reference position and the final position of manipulative indexing, be used for making comparisons with the current index offset that reads, the current setting initial value that reads index offset is exactly the reference position of index, the size of the described every batch of index that reads is exactly described predetermined value S, and described predetermined value S can set as required.
11. the index read method of multimedia container formatted file as claimed in claim 9 is characterized in that, described index offset record sheet also comprises the index record item parts, and described index record item parts is used for storing each batch index of reading from index.
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| CN102196268B (en) * | 2011-05-06 | 2013-03-20 | 华为数字技术（成都）有限公司 | Method, device and system for processing multimedia data |
| CN103974013B (en) * | 2013-01-24 | 2017-09-08 | 杭州海康威视数字技术股份有限公司 | Carry out the method and video record equipment of video record playback |
| CN104661058B (en) * | 2013-11-20 | 2018-01-16 | 深圳市云帆世纪科技有限公司 | Data flow transmission method, client and the VOD system of MP4 video request programs |
| CN113596704A (en) * | 2020-04-30 | 2021-11-02 | 上海风语筑文化科技股份有限公司 | Real-time space directional stereo decoding method |
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| US5778361A (en) * | 1995-09-29 | 1998-07-07 | Microsoft Corporation | Method and system for fast indexing and searching of text in compound-word languages |
| CN1632798A (en) * | 2004-12-31 | 2005-06-29 | 北京中星微电子有限公司 | Chinese dictionary search engine and method for quick positioning words in Chinese dictionary |
| CN1845099A (en) * | 2006-04-27 | 2006-10-11 | 掌富科技(南京)有限公司 | Method and structure for conversion and storage of multimedia electronic file in intelligent mobile terminal |
| CN1963814A (en) * | 2006-11-29 | 2007-05-16 | 珠海市泰德企业有限公司 | Managing method of data of memorizer |
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|---|---|---|---|---|
| US5778361A (en) * | 1995-09-29 | 1998-07-07 | Microsoft Corporation | Method and system for fast indexing and searching of text in compound-word languages |
| CN1632798A (en) * | 2004-12-31 | 2005-06-29 | 北京中星微电子有限公司 | Chinese dictionary search engine and method for quick positioning words in Chinese dictionary |
| CN1845099A (en) * | 2006-04-27 | 2006-10-11 | 掌富科技(南京)有限公司 | Method and structure for conversion and storage of multimedia electronic file in intelligent mobile terminal |
| CN1963814A (en) * | 2006-11-29 | 2007-05-16 | 珠海市泰德企业有限公司 | Managing method of data of memorizer |
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| JP特开平10-74156A 1998.03.17 |
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