CN101552791B - Method and system for playing multiple media file - Google Patents

Method and system for playing multiple media file Download PDF

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Publication number
CN101552791B
CN101552791B CN200910143282A CN200910143282A CN101552791B CN 101552791 B CN101552791 B CN 101552791B CN 200910143282 A CN200910143282 A CN 200910143282A CN 200910143282 A CN200910143282 A CN 200910143282A CN 101552791 B CN101552791 B CN 101552791B
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media file
filter
media
information
filter link
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CN101552791A (en
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李世平
郑全战
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Tencent Technology Shenzhen Co Ltd
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Tencent Technology Shenzhen Co Ltd
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Abstract

The application discloses a method and system for playing multiple media files. The method includes extracting the type information from the current media file, judging the current media file whether or not the identical type of the last media file based on the extracted type information, generating filtration mirror chain circuit of the current media file using the filtration mirror chain circuitof the last media file if the two media files are the identical types, or creating filtration mirror chain circuit of the current media file and playing the current media file if not. The method and system of this application can improve the switching velocity of playing multiple media files.

Description

Play the method and system of a plurality of media files
Technical field
The application relates to data computing and processing, relates in particular to the method and system of playing a plurality of media files.
Background technology
Along with the development of computing technique and medium technique, it is more and more convenient to obtain media resource, thereby it is more and more general to go up playing media file at electronic equipment (for example personal computer, PDA, multimedia player etc.).
Media play technology commonly used at present (for example, DirectShow technology) adopts filter to realize the broadcast of media file.Filter is relatively independent functional module, and each filter connects into one " streamline " (being the filter link) in sequence and carries out data processing, thereby realizes the play operation of media file.Therefore, be required to be media file and create the filter link and just can play, and switching to when playing another media file, be required to be the media file that to play and create the filter link again from playing a media file.
Proposed a kind of method and apparatus for media file establishment filter link in the applicant's No. 200810097544.9 unsettled one Chinese patent application (publication number is CN101272390A), the full content of this patent application is incorporated this paper into as a reference.
The process more complicated of establishment filter link and consuming time.If the user wants to play continuously a plurality of media files, from being written into a media file,, generally need wait for the long period owing to there is the process of creating the filter link to beginning broadcast, make that the switch speed of playing a plurality of media files is slower.
Summary of the invention
Switch speed when playing a plurality of media file in order to improve, the application has proposed a kind of method and system of playing a plurality of media files.
According to the application's a aspect, a kind of method of playing a plurality of media files can comprise: extract type information from the current media file; According to the type information that is extracted, judge whether a current media file and a last media file are same type; If a current media file and a last media file are same type, then utilize the filter link of the filter link generation current media file of a last media file, otherwise, the filter link of establishment current media file; Play the current media file.
According to another aspect of the application, a kind of system that plays a plurality of media files can comprise: extraction unit, extract type information from the current media file; Judging unit according to the type information that extracts, judges whether a current media file and a last media file are same type; Filter link generation unit according to the judgement of said judging unit, utilizes the filter link of the filter link generation current media file of a last media file; Broadcast unit is play the current media file.
Description of drawings
Below will be according to the specific embodiments of accompanying drawing DETAILED DESCRIPTION The present application, wherein:
Fig. 1 is a flow chart of playing the method for a plurality of media files in the prior art;
Fig. 2 is the sketch map of an example of filter link;
Fig. 3 is the flow chart according to the method for a plurality of media files of broadcast of an aspect of the application;
Fig. 4 utilizes existing filter link to generate the flow chart of media file filter link;
Fig. 5 is the block diagram according to the system of a plurality of media files of broadcast of another aspect of the application;
Fig. 6 is the block diagram according to system's specific embodiment of the application's a plurality of media files of broadcast.
Embodiment
Fig. 1 shows the old process of playing a plurality of media files.As shown in Figure 1, when the needs playing media file, opening a media file (step S101) afterwards, at first create filter link (step S102) for this media file, utilize the filter link of being created to play this media file (step S103) then.After the current media file finishes, the next media file (step S104) that judges whether to exist needs to play, if exist, repeating step S101~S104 then is till the media file that does not have needs broadcast.
Can find out through Fig. 1, in the media play flow process of routine,, need create the filter link for each media file in order to play a plurality of media files.
In current media play technology commonly used, filter can comprise the source filter, separate filter, the filter and play up filter of decoding, and they have division of labor responsibility separately.The process of playback of media files is exactly that these filters are coupled together the process of carrying out data processing, and figuratively speaking, the process of playing media file makes the process that media file data " flows " exactly in the filter link.Fig. 2 shows a kind of exemplary filter link.Wherein, The source filter is commonly used to obtain media file data; The effect that separates filter is that the several data that comprises in the media file is separated, and for example, media file can comprise voice data and video data; The data flow of correspondingly, separating filter output then can comprise corresponding to the audio frequency branch of voice data with corresponding to the video branch (as shown in Figure 2) of video data.Though Fig. 2 only shows audio frequency branch and video branch, it will be understood by those skilled in the art that the filter link of being created also can comprise for example other branch such as captions branch when media file data for example comprises other categorical data such as caption data.As shown in Figure 2, every branch all can comprise the decoding filter and play up filter in the filter link.The decoding filter can decompress to for example video data or voice data etc., can be used for display of video content or plays back audio content etc. and play up filter.
The form of media file can comprise Container Format, video format and audio format.File container format is used for the rule of depositing of regulation media file video data and voice data, and corresponding with the extension name of media file usually, common file container format has: avi, asf; Real, mpeg1, mpeg2, mpeg4; Mp3, mov, flv, mkv etc.Video format is used for regulation compression of video data standard, and common video format has: H.26x serial (h.261, h.263, h.264), MPEG series (mpeg 1video, mpeg2video, mpeg4video), wmv, real video, On2vp series etc.Audio format is used for the compression standard of regulation voice data, and common audio format has: mpeg layer3audio, aac, ac3, wma, real audio etc.Along with the development of technology, the form of media file is more and more, and this makes the processing procedure for the filter link of media file establishment become increasingly complex.In the applicant's No. 200810097544.9 unsettled one Chinese patent application (publication number is CN101272390A), a kind of method for media file establishment filter link has been proposed, can improve the connection speed of filter and the playing efficiency of media file.However, the process of creating the filter link is still more consuming time, and especially to high-quality media file, the time of creating the process cost of filter link possibly reach several seconds.
Be appreciated that to create according to concrete media file and play the required filter link of this media file.In this application, with being the type information of this media file with creating the relevant information definition of filter link in the media file.If the type information of two media files is identical, then these two media files have same type, can use identical filter link to realize playing.
In general, the type of each filter in the form of the media file filter link that can confirm basically to be created.Particularly; The Container Format of media file can be used for confirming source filter and the type of separating filter; Video format can be used for confirming that video decode filter and video play up the type of filter, and audio format can be used for the type that definite audio decoder filter and audio frequency are played up filter.In other words, if the Container Format of two media files, video format and audio format are all identical, then they can adopt the filter link of basic identical type to realize playing.Certainly; It will be appreciated by those skilled in the art that; Confirming of filter link also can be relevant with the out of Memory of media file, and for example, the number of video streams of media file and audio stream number can influence the concrete setting of video filter and audio frequency filter in the filter link respectively; And the out of Memory of media file, for example information such as code check (video code rate, audio code rate etc.), picture dimension, audio track number or even program duration are also relevant with specifically being provided with of filter link.
It is pointed out that in this application, claim that two media files have the type information of " identical ", do not really want to be restricted to the type information of these two media files in full accord.With the program duration in the type information is example, is not too big (for example can be set to be no more than 50% or 30%) if the program duration of two media files differs, and can think that then the program duration of two media files is identical.For example, the program duration of two media files was respectively 60 minutes and 70 minutes, can think that then they have identical program duration.Whether identical for such as judgement such as the other types information of code check, video code rate, audio code rate, picture dimension, audio track number etc., those skilled in the art also can carry out similar definition, repeat no more at this.Likewise; Those skilled in the art should understand that; Because the type information of two media files generally is not in full accord,, be not that the required filter link of two playback of media files of requirement is in full accord if therefore two media files can adopt the filter link of " identical " to realize playing yet.
Under many circumstances, a plurality of media files that the user needs to play continuously can have identical type, and promptly the type information of a plurality of media files is identical.For example; The user possibly want to play continuously a plurality of files that comprised in same the film; A plurality of works in the perhaps same music album; And the type information of these files is identical usually, and for example, they have identical form (Container Format, video format and audio format etc.), identical or approximate code check, picture dimension, audio track number, program duration or the like usually.For media file, be identical in order to play the required filter link of each file with same type information.But according to process as shown in Figure 1, need before playing each file, be respectively it and create filter link separately, computational resource has been wasted in such processing, causes the switch speed of playback of media files to reduce.
When playing media file; If the media file of this less important broadcast has same type with the media file of last time having play; Can create the filter link again, and be utilized as the filter link that the media file last time play is created, generate the filter link of the media file of this less important broadcast; Play thereby realize this, can improve the switch speed when playing a plurality of media file like this.Based on this thinking, the application has proposed a kind of method and system of playing media file.
Method according to a plurality of media files of broadcast of an aspect of the application; When playing a plurality of media file; If the media file of this less important broadcast is first media file (for example first file in the playlist); Then need carry out the process for this media file establishment filter link as shown in Figure 1, could utilize the filter link of establishment to realize playing then.After first playback of media files finishes, open next media file.Owing to existed for the filter link of the media file establishment of last time having play,, not the step that kind as shown in Figure 1 directly carries out creating for it filter link then according to the application's a embodiment.To describe the method for playing a plurality of media files according to the application's a aspect in detail with reference to Fig. 3 below.Should be appreciated that; In the flow process shown in Fig. 3, not the first media file in a plurality of media files as the media file of process object, but such media file; That is, before this playback of media files, had the filter link of creating for the media file of last time having play.
As shown in Figure 3, after opening media file, at first extract the type information (step S301) of media file.In this application, media file can be to be stored in local media file, also can be the media file of remote storage, the for example media resource on the Internet.In an exemplary, the type information of the media file that is extracted can comprise Container Format, video format, audio format, number of video streams, audio stream number, code check (video code rate, audio code rate etc.), picture dimension, audio track number, program duration etc.These information can be included in the header information of media file usually, thereby can obtain through the header information of resolving media file.The information that extracts for example can be stored in the local memory device.Then, the type information of the media file of the less important broadcast of basis of extracting is compared with the type information of the media file of last time having play, judge whether two media files are same type (step S302).As stated, two medium have same type and do not mean that the type information of these two media files must be identical.Those skilled in the art can define the identical implication of type information of two media files as required voluntarily; For example; Can the identical Container Format, video format, audio format, number of video streams, audio stream number, code check, picture dimension, audio track number of being defined as of type information is identical, the program duration differs and is no more than 30%.In addition, though be appreciated that the type information that to preserve each media file that is extracted,, can only preserve the type information of the media file of last time having play, and needn't store the type information of the media file of having play more early from the consideration that economizes on resources.
If the media file of this less important broadcast is identical with the type of the media file of last time having play; Then can be utilized as the filter link (step S303) that filter link that the media file last time play creates generates the media file of this less important broadcast, then playing media file (step S304).After the playback of media files of this broadcast finishes, judge whether to exist the next media file (step S305) of needs broadcast, if exist, then repeat above process, otherwise playing process finishes.
In step S302; If it is dissimilar judging two media files through the media file of this less important broadcast with the type information of the media file of last time having play, represent that then the media file of this less important broadcast can not utilize the filter link of the media file of last time having play to realize play operation.At this moment, for playing media file, need create filter link (step S306) for the media file of this less important broadcast.Variety of way capable of using is created the filter link, the method for disclosed establishment filter link in the applicant's No. 200810097544.9 unsettled one Chinese patent application (publication number is CN101272390A) for example, and the application repeats no more.
To specifically describe the filter link (following abbreviation " existing filter link ") that how to be utilized as the media file last time play and to create below and realize the play operation of the media file of this less important broadcast.After a playback of media files finishes; Need stop the transmission of media file data in its filter link; That is, the media file data that stops last time to have play flowing in the filter link, and the filter place closes the media file of last time having play in the source; For example, can the handle that the media file of last time having play is opened be discharged.Under the identical situation of former and later two media file type information; According to aforesaid exemplary; The filter link of creating for the media file last time play capable of using generates the filter link of the media file of this less important broadcast, will describe this process in detail with reference to Fig. 4 below.
As shown in Figure 4, can the connection corresponding relation that have each filter in the filter link be backed up (step S401), the output of breaking off the source filter then connects (step S402).In order to utilize existing filter link to play the media file of this less important broadcast, can be in the source filter place be written into the media file (step S403) of this less important broadcast again, form the filter link (step S404) of the media file of this less important broadcast then.
The connection corresponding relation of each filter can be kept in the local memory device in the existing filter link that in step S401 shown in Figure 4, backs up; The connection corresponding relation that is backed up for example can comprise: the data of source filter output Pin; The data of other filters input Pin and output Pin, and source filter output Pin and the filter that is connected are imported the corresponding relation between the Pin etc.
The step S403 that the filter place is written into the media file of this less important broadcast again in the source can carry out as follows: obtain the media information of this media file through the for example header information of analyzing medium file, the media information with the media file that obtains upgrades the source filter then.Here the media information of said media file for example can comprise format information (like Container Format, video format, audio format etc.), number of video streams, audio stream number, code check (like video code rate, audio code rate etc.), picture dimension, audio track number, program duration, copyright information, Production Time, tools, remark information of media file etc.Be appreciated that the media information of media file has comprised the type information of media file.Therefore, can step S301 shown in Figure 3 be made amendment, at first extract and the media information of store media files, the type information of therefrom choosing media file is then sent into step S302 and is judged.Like this, in step S403 shown in Figure 4, the media information of the media file that extracts before and store can be directly called in the operation of obtaining the media information of media file.
Next, can be in step S404, according to the media information of the media file of the less important broadcast of upgrading in the filter of source of basis and the connection corresponding relation of the existing filter link of backup before, form the filter link of the current media file that will play.For example, can generate the filter link of the current media file that will play: at first,, generate corresponding source filter output Pin according to the media information of the media file that upgrades in the filter of source through following process; Then, according to the connection corresponding relation of existing filter link of backup, obtain source filter output Pin and the filter that is connected and import corresponding relation between the Pin etc.; Afterwards, import the information such as corresponding relation between the Pin with the filter that is connected, form in order to realize the filter link of current broadcast in conjunction with source filter output Pin that is generated and source filter output Pin.
Utilize existing filter link generate the filter link of the media file of this less important broadcast, or create the filter link that makes new advances for the media file of this less important broadcast after; Can start the media file data transmission in the filter link; The media file data of this less important broadcast begins in the filter link, to flow, thereby realizes the broadcast of this media file.
To describe system in detail with reference to Fig. 5~8 below according to a plurality of media files of broadcast of another aspect of the application.
As shown in Figure 5, can comprise according to the system of a plurality of media files of broadcast of an embodiment of the application: extraction unit 100, judging unit 200, filter link generation unit 300 and broadcast unit 400.Extraction unit 100 is used for extracting type information from media file, and can the type information that extract be stored in the for example local memory device.Judging unit 200 is according to the type information that extraction unit 100 provides, and judges whether the type information of media file of this less important broadcast is identical with the type information of the media file of last time having play, and judged result is offered filter link generation unit 300.If judged result representes that the type information of former and later two media files is identical, then filter link generation unit 300 can be utilized as the filter link that filter link that the media file last time play creates generates the media file of this less important broadcast.Afterwards, the filter link that broadcast unit 400 utilizes filter link generation unit 300 to generate is realized this playback of media files operation.
Be appreciated that in the system of a plurality of media files of broadcast shown in Figure 5, also can further comprise filter link establishment unit (not shown).If judgement through judging unit 200; The type information of the media file of this less important broadcast is different with the type information of the media file of last time having play; That is to say that former and later two media files have dissimilar thereby can not use identical filter link, need be that the media file of this less important broadcast is created and play required filter link by filter link establishment unit then.In addition, if the media file of this less important broadcast is first media file (for example first file in the playlist), then, therefore need create the filter link for this first media file by filter link establishment unit owing to there is not existing filter link.The application's filter link establishment unit can adopt variety of way to make up; For example can be employed in the device of disclosed establishment filter link in the applicant's No. 200810097544.9 unsettled one Chinese patent application (publication number is CN101272390A), repeat no more here.
Next will describe the concrete structure of filter link generation unit 300 in detail with reference to Fig. 6.According to the application's a exemplary, filter link generation unit 300 can comprise that backup module 302, heavily loaded module 304 and filter link form module 306.Backup module 302 be used for last time the connection corresponding relation of each filter of the filter link of playing media file (promptly " existing filter link ") back up; For example; Can be with the data of source filter output Pin; The data of other filters input Pin and output Pin, and the corresponding relation between source filter output Pin and the filter input Pin that is connected etc. is saved in the memory device of this locality for example.After the output of the source filter that breaks off existing filter link connected, the filter place was written into the media file of this less important broadcast to heavily loaded module 304 again in the source.Then, the filter link forms the result of module 306 according to backup module 302 and heavily loaded module 304, is the media file formation filter link of this less important broadcast.
Fig. 6 also further shows the concrete structure according to the heavily loaded module 304 of an exemplary of the application.As shown in Figure 6, heavily loaded module 304 can comprise media information acquisition module 304-1 and update module 304-2.Media information acquisition module 304-1 can obtain the media information of this media file through the for example modes such as header information of analyzing medium file, and then, update module 304-2 utilizes the media information of the media file that obtains that the source filter is upgraded.
As previously mentioned, the media information of media file has comprised type information.Therefore; An exemplary according to the application; Extraction unit can have concrete structure as shown in Figure 6,, comprises that further media information extraction module 102 that obtains the media file media information and the type information that from media information, selects type information choose module 104 that is; Wherein, can be kept in the memory device through the media information that the header information of for example resolving media file obtains by media information extraction module 102.Be appreciated that; When extraction unit has said structure; Media information acquisition module 304-1 can obtain media information through the modes such as header information of for example resolving media file; But the direct media information that from memory device, reads the media file that passes through 102 extractions of media information extraction module and storage, to save overhead.
Abovely be described with reference to the exemplary execution mode of accompanying drawing to the application.It should be appreciated by those skilled in the art that above-mentioned execution mode only is for illustrative purposes and the example of being lifted, rather than be used for limiting.All any modifications of under instruction and the claim protection range of application, being done, be equal to replacement etc., all should be included in the scope that the application requires to protect.

Claims (7)

1. play the method for a plurality of media files, comprising:
Extract type information from the current media file;
According to the type information that is extracted, judge whether a current media file and a last media file are same type;
If a current media file and a last media file are same type, then utilize the filter link of the filter link generation current media file of a last media file, it comprises:
Back up the connection corresponding relation of the filter link of a said last media file,
The output of source filter of breaking off the filter link of a said last media file connects,
Again be written at filter place, said source said current media file and
Form the filter link of said current media file,
Otherwise, the filter link of establishment current media file; And
Play the current media file.
2. the method for claim 1, wherein before the said step of extracting type information from the current media file, said method further comprises:
For first media file is created the filter link.
3. the method for claim 1, wherein being written into said current media file again at filter place, said source comprises:
Obtain the media information of said current media file;
The media information of the said current media file that utilization is obtained upgrades said source filter.
4. the method for claim 1, wherein extracting type information from said current media file comprises:
Extract the media information of current media file;
From the said media information that extracts, choose type information.
5. play the system of a plurality of media files, comprising:
Filter link establishment unit, said filter link establishment unit are that media file is created the filter link;
Extraction unit extracts type information from the current media file;
Judging unit according to the type information that extracts, judges whether a current media file and a last media file are same type;
Filter link generation unit according to the judgement of said judging unit, utilizes the filter link of the filter link generation current media file of a last media file, comprising,
Backup module backs up the connection corresponding relation of the filter link of a last media file,
The heavy duty module is written into the current media file again at the filter place, source of the filter link of a last media file, and
Form module, form the filter link of current media file;
Broadcast unit is play the current media file.
6. system as claimed in claim 5, wherein, said heavily loaded module comprises:
The media information acquisition module obtains the media information of current media file; And
Update module, the media information of the said current media file that use is obtained upgrades said source filter.
7. system as claimed in claim 5, wherein, said extraction module further comprises:
The media information extraction module, the media information of extraction current media file;
Type information is chosen module, from the said media information that extracts, selects type information.
CN200910143282A 2009-05-22 2009-05-22 Method and system for playing multiple media file Active CN101552791B (en)

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