CN105893012A - Method and device for generating video screenshot in Android system - Google Patents
Method and device for generating video screenshot in Android system Download PDFInfo
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- CN105893012A CN105893012A CN201510869062.0A CN201510869062A CN105893012A CN 105893012 A CN105893012 A CN 105893012A CN 201510869062 A CN201510869062 A CN 201510869062A CN 105893012 A CN105893012 A CN 105893012A
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- sectional drawing
- information
- video content
- video
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/20—Software design
- G06F8/22—Procedural
Abstract
The embodiment of the invention provides a method and a device for generating a video screenshot in an Android system. The method comprises the following steps: obtaining the information of video contents; obtaining the screenshot requirement information of the video contents, wherein the screenshot requirement information comprises the length and the width of a target screenshot, an initial screenshot time point, an end screenshot time point, a screenshot time interval and the information of a screenshot target catalogue; and taking the information of the video contents and the screenshot requirement information as parameters to call an Android native function to generate the screenshots of the plurality of video contents, and storing the generated screenshots into the screenshot target catalogue. The Android native function is called on the java layer of Android to continuously generate the screenshots of the plurality of video contents. The Android native function is called in one time to continuously generate a plurality of video screenshots having specified dimensions of the video contents, a screenshot function does not need to be called when each video screen is generated, so that screenshot operation efficiency is improved, and memory can be saved.
Description
Technical field
The present invention relates to technical field of video processing, particularly relate to a kind of for raw in Android system
The method and apparatus becoming video interception.
Background technology
Preferably experiencing to be supplied to user, multimedia player in the market is many in process
During media file, the thumbnail of multimedia file can be obtained and as multimedia document information displaying
A part.
In the equipment using Android system, within causing multimedia because of start or the most slotting SD card etc.
When holding change, Android system can call MediaScanner service and carry out background scanning, to new song
The information such as song, picture and video are indexed.In the process, system can automatically will scan
Video file generates thumbnail and preserves.If needing rapid extraction video thumbnails, then can be direct
Access android.provider.MediaStore.Video.Thumbnails data base and inquire breviary
Figure.
Although this mode uses simple, but cannot ensure that the thumbnail that system automatically generates meets
The demand of developer, must update media library just can see the thumbnail of up-to-date video simultaneously, because of
This is in the exploitation higher to video invitation and inapplicable.
On the other hand, Android system additionally provides the API manually obtaining video thumbnails, i.e.
ThumbnailUtils.createVideoThumbnail () function and
ThumbnailUtils.extractThumbnail () function.Can be manual by being applied in combination the two method
Ground obtains the thumbnail of special time point in video.But, continuously acquiring in this way adopting
Needing during video thumbnails repeatedly to call the method, the longest, internal memory uses the biggest, and
And during intercepting continuously, various problem easily occurs.
Summary of the invention
It is an object of the invention to provide a kind of method for generating video interception in Android system
And device, with solve intercept occur during frame of video picture time-consuming internal memory uses big for a long time,
And it is difficult to the problem intercepted continuously.
According to an aspect of the present invention, it is provided that a kind of for generating video interception in Android system
Method, described method includes: obtain the information of video content；Obtain the sectional drawing of described video content
Requirement information, described sectional drawing requires when information includes the length and width of target sectional drawing, initial sectional drawing
Between point, terminate sectional drawing time point, sectional drawing time interval and the information of sectional drawing target directory；With institute
Information and the described sectional drawing of stating video content require that information is the primary function of parameter call Android, with
Generate the sectional drawing of multiple described video content, and the sectional drawing of generation is stored in described sectional drawing target mesh
In record.
Preferably, the primary function of described Android is native_startcutting function.
Preferably, the information of described video content includes the source file information of described video content.
Preferably, the sectional drawing of the described video content of described acquisition requires that the process of information includes: according to
The source file information of described video content reads described video content and metadata thereof；According to described unit
Video duration in data determines described initial sectional drawing time point and terminates sectional drawing time point.
Preferably, the sectional drawing of the described video content of described acquisition requires that the process of information also includes: from
Configuration file reads the length and width of described target sectional drawing, sectional drawing time interval and/or described
The data of sectional drawing target directory, or the length and width of the described target sectional drawing of acquisition user's input,
Sectional drawing time interval and/or the data of described sectional drawing target directory.
According to a further aspect in the invention, it is provided that a kind of for generating video interception in Android system
Device, described device includes: video content information acquiring unit, for obtaining video content
Information；Sectional drawing requires information acquisition unit, requires information for obtaining the sectional drawing of described video content,
Described sectional drawing requires that information includes the length and width of target sectional drawing, initial sectional drawing time point, end
Sectional drawing time point, sectional drawing time interval and the information of sectional drawing target directory；Sectional drawing signal generating unit,
For requiring that information is primary for parameter call Android with the information of described video content and described sectional drawing
Function, to generate the sectional drawing of multiple described video content, and is stored in described cutting by the sectional drawing of generation
In figure target directory.
Preferably, the primary function of described Android is native_startcutting function.
Preferably, the information of described video content includes the source file information of described video content.
Preferably, described sectional drawing requires that information acquisition unit includes: digital independent subelement, is used for
Source file information according to described video content reads described video content and metadata thereof；During sectional drawing
Between point determine subelement, for determining described initial sectional drawing according to the video duration in described metadata
Time point and end sectional drawing time point.
Preferably, described sectional drawing requires that information acquisition unit also includes: target sectional drawing data acquisition
Unit, for reading the length and width of described target sectional drawing, sectional drawing time interval from configuration file
Data and/or the data of described sectional drawing target directory, or obtain user input described mesh
The mark length and width of sectional drawing, sectional drawing time interval and/or the data of described sectional drawing target directory.
The method and apparatus being used for generating video interception in Android system that the embodiment of the present invention provides,
By the java layer in Android by the information of video content, the information of sectional drawing target directory and sectional drawing
Requirement information passes to C/C++ layer as parameter, calls primary (native) function of Android, with
It is continuously generated the sectional drawing of multiple video content.Connect by disposably calling the primary function of Android
Generate the video interception of multiple given sizes of video content, without generating each regarding continuously
Frequently call a sectional drawing function during sectional drawing, thus the operating efficiency of sectional drawing can be improved, and also can save
Province's internal memory uses.
Accompanying drawing explanation
Fig. 1 be illustrate according to embodiments of the present invention one in Android system generate video interception
The flow chart of method；
Fig. 2 is the illustrative diagram illustrating the method for generating video interception in Android system；
Fig. 3 be illustrate according to embodiments of the present invention two in Android system generate video interception
The logic diagram of device；
Fig. 4 be illustrate according to embodiments of the present invention three in Android system generate video interception
The logic diagram of device.
Detailed description of the invention
Describe the exemplary embodiment of the present invention below in conjunction with the accompanying drawings in detail.
Embodiment one
Fig. 1 be illustrate according to embodiments of the present invention one in Android system generate video interception
The flow chart of method.
With reference to Fig. 1, in step S110, obtain the information of video content.
The information of above-mentioned video content can include, but not limited to the source file information of this video content,
May also include the mark of video content, duration etc..Source file refers to record the literary composition of this video content
Part.
In step S120, obtain the sectional drawing in video and require information.
Sectional drawing requires that information is the operation requirement when picture carries out intercept operation, including, but
It is not limited to, sectional drawing parameter and sectional drawing storage data etc..Such as, the sectional drawing of a certain section of video is wanted
Ask the information can be to the length of the picture of this video interception, width, initial sectional drawing time point (such as 0.00
Second), terminate sectional drawing time point (such as 0.01 second) and sectional drawing time interval etc. makes requirement.
In the present embodiment, the length of picture can be 200 pixels or 20 pixels, and width is such as
150 pixels or 15 pixels, it is possible to carry out choosing of intelligence according to the size of user computer display；
Initial sectional drawing time point can be 0.00 second, terminate sectional drawing time point is 0.01 second, the now sectional drawing time
It is spaced apart 0.01 second.By arranging different sectional drawing sizes and sectional drawing time interval, can be as required
Generate such as thumbnail or the video interception identical with video frame size, for different application programs
Use.Such as, the thumbnail of intercepting can be as corresponding to the time migration on video playback progress bar
Breviary preview, and can use as video preview content with the video interception of frame of video formed objects.
In step S130, require that information is for parameter call Android with information and the sectional drawing of video content
Primary function, to generate the sectional drawing of multiple video content, and is stored in sectional drawing mesh by the sectional drawing of generation
In heading record.
Further, sectional drawing requires that information also includes the information of sectional drawing target directory.Sectional drawing target mesh
Record is the target storage position of the sectional drawing for preserving generation.User can preset a preservation and cut
The file of figure, and this document is associated.Process when a certain fragment of video is performed sectional drawing
After, spontaneous being saved in this document folder of figure sector-meeting of intercepting, call for user.Preferably
Ground, can arrange multiple file and optionally preserve different length, width and intercepting time interval
Picture, so that user searches the format picture wanted more easily.
In the present embodiment, the primary function of Android can be native_startcutting function.
Specifically, native_startcutting function/method for the video source file specified according to
Given requirement and sectional drawing parameter generate multiple video interception, and store to the destination folder specified
In.It is below the definition of this function/method:
public native int native_startcutting(String src_path,String dst_path,
long begin_time,long end_time,long interval_time,int width,int height)
Wherein, src_pat represent video source file (mainly include video content source file catalogue and
File name etc.)；Dst_path represents that thumbnail preserves file directory, i.e. sectional drawing target directory；
Begin_time represents the time started, i.e. sectional drawing start time point；End_time represents the end time,
I.e. sectional drawing end time point；Interval_time express time is spaced, phase between the most every twice sectional drawing
Every time span；Width represents sectional drawing picture width；Height represents sectional drawing picture height.
The method being used for generating video interception in Android system that the present embodiment provides, by regarding
Frequently the source file information of content, the information of sectional drawing target directory, the length and width of target sectional drawing,
Initial sectional drawing time point, the end information such as sectional drawing time point, sectional drawing time interval are as a parameter to adjust
Use native_startcutting function, shot operation is passed to C++ layer and processes, to customize generation
Multiple sectional drawings of video content are also stored in predetermined storage position.
Thus, by disposably calling the primary function of Android, to be continuously generated video content many
The video interception of individual given size, calls a sectional drawing without when generating each video interception
Function, thus the operating efficiency of sectional drawing can be improved, and also internal memory use can be saved.
Fig. 2 is the illustrative diagram illustrating the method for generating video interception in Android system.
A frame of video of one section video content is shown respectively in Fig. 2 upper end, lower end is shown respectively and regards from this
Frequently multiple video interception of contents interception.
With reference to Fig. 2, the sectional drawing obtaining video content requires that the process of information includes: according in video
The source file information held reads video content and metadata thereof, and according to the video duration in metadata
Determine initial sectional drawing time point and terminate sectional drawing time point.
The data produced when the metadata of video is video file source file information creating, it is also possible to be
The compiled code of picture is generated from video.In the present embodiment, in same section of video, Ke Yixuan
Select multiple section and carry out sectional drawing.Preferably, select to use according to the video duration in the metadata of video
The picture of a certain section in this video intercepted is wanted at family, determines initial sectional drawing time point and terminates to cut
Figure time point, thus shot operation can be customized further.Such as, a certain section of video of 3 minutes can
Carry out the intercepting of 3 fragments synchronized, as at the 0.00th second to the 60.00th second, the 60.01st second
To the 1200.00th second, three segment sync interceptings in the 120.01st second to the 180.00th second, with more
Intercept picture rapidly, save the time.
Further, the sectional drawing obtaining video content requires that the process of information also includes: from configuration literary composition
Part reads the length and width of target sectional drawing, sectional drawing time interval and/or sectional drawing target directory
Data, or obtain user input the length and width of target sectional drawing, sectional drawing time interval and/
Or the data of sectional drawing target directory.
Specifically, configuration file refers to different objects are carried out different configuration of file, in this enforcement
In example, configuration file is a file requiring form about sectional drawing of user's preset in advance.Such as,
The sectional drawing obtaining video content requires that information specifically has two kinds of implementations: one, user sets in advance
Fixed sectional drawing requirement, such as, the length and width of target sectional drawing, sectional drawing time interval and/or
The data of sectional drawing target directory, and in the way of the form preservation of configuration file；Its two, Yong Huye
The on-the-spot form that sets can be carried out during sectional drawing, such as, the user interface provided can be passed through,
Directly input the mark length and width of sectional drawing, sectional drawing time interval and/or sectional drawing target directory
The mode of data.Utilize above two method can yet further customize shot operation, and can lead to
Cross amendment call parameters to use Same Way to generate repeatedly to meet the video of different sectional drawing requirement and cut
Figure.
The multiple video interception generated according to abovementioned steps can be used for during video content is play,
When the progress that video content is play by user checks (such as when playing slip in progress bar)
Or when adjusting (such as when playing progress bar up and down by slip), it is shown that cut for corresponding time point
The thumbnail taken, thus user can be visually known the actual development playing video.
Embodiment two
Fig. 3 be illustrate according to embodiments of the present invention two in Android system generate video interception
The logic diagram of device.
With reference to Fig. 3, this device includes that video content information acquiring unit 310, sectional drawing requirement information obtain
Take unit 320 and sectional drawing signal generating unit 330.
Video content information acquiring unit 310 is for obtaining the information of video content.
Specifically, the information of video content includes the source file information of video content.
Sectional drawing requires that information acquisition unit 320 requires information for the sectional drawing obtaining video content.
The information of the sectional drawing signal generating unit 330 video content for obtaining with information acquisition unit 310
And sectional drawing requires that the sectional drawing that information acquisition unit 320 obtains requires that information is that parameter call Android is former
Raw function, to generate the sectional drawing of multiple video content, and is stored in described sectional drawing by the sectional drawing of generation
In target directory.
Wherein, sectional drawing require information include the length and width of target sectional drawing, initial sectional drawing time point,
Terminate sectional drawing time point, sectional drawing time interval and the information of sectional drawing target directory.
Specifically, the primary function of Android can be native_startcutting function.
Embodiment three
Fig. 4 be illustrate according to embodiments of the present invention three in Android system generate video interception
The logic diagram of device.
With reference to Fig. 4, this device includes that video content information acquiring unit 310, sectional drawing requirement information obtain
Take unit 320 and sectional drawing signal generating unit 330.
Video content information acquiring unit 310 is for obtaining the information of video content.
Sectional drawing requires that information acquisition unit 320 requires information for the sectional drawing obtaining video content.
The information of the sectional drawing signal generating unit 330 video content for obtaining with information acquisition unit 310
And sectional drawing requires that the sectional drawing that information acquisition unit 320 obtains requires that information is that parameter call Android is former
Raw function, to generate the sectional drawing of multiple video content, and is stored in described sectional drawing by the sectional drawing of generation
In target directory.
Further, sectional drawing require information acquisition unit 320 include digital independent subelement 321,
Sectional drawing time point determines subelement 322 and target sectional drawing data acquisition subelement 323.
Digital independent subelement 321 reads video content for the source file information according to video content
And metadata.
Sectional drawing time point determines that subelement 322 is for the first number obtained with digital independent subelement 321
Video duration according to determines initial sectional drawing time point and terminates sectional drawing time point.
Specifically, above-mentioned sectional drawing time point determines the initial sectional drawing time that subelement 322 will determine
The information of point and end sectional drawing time point passes to sectional drawing signal generating unit 330.
Target sectional drawing data acquisition subelement 323 for reading the length of target sectional drawing from configuration file
With width, the data of sectional drawing time interval and/or the data of sectional drawing target directory, or it is used for
Obtain the length and width of target sectional drawing, sectional drawing time interval and/or the sectional drawing mesh of user's input
The data of heading record.
Specifically, above-mentioned target sectional drawing data acquisition subelement 323 is by the length of the target sectional drawing of acquisition
The data of degree and width and/or sectional drawing time interval pass to sectional drawing signal generating unit 330.
The method and apparatus being used for generating video interception in Android system that the embodiment of the present invention provides,
By the java layer in Android by the information of video content, the information of sectional drawing target directory and sectional drawing
Requirement information passes to C/C++ layer as parameter, calls primary (native) function of Android, with
It is continuously generated the sectional drawing of multiple video content.Connect by disposably calling the primary function of Android
Generate the video interception of multiple given sizes of video content, without generating each regarding continuously
Frequently call a sectional drawing function during sectional drawing, thus the operating efficiency of sectional drawing can be improved, and also can save
Province's internal memory uses.
It may be noted that according to the needs implemented, all parts/step described in this application can be torn open
It is divided into more components/steps, it is possible to by two or more components/steps or the part of components/steps
The components/steps that operational group synthesis is new, to realize the purpose of the present invention.
Above-mentioned the method according to the invention can realize in hardware, firmware, or is implemented as depositing
Store up the software in record medium (such as CD ROM, RAM, floppy disk, hard disk or magneto-optic disk)
Or computer code, or be implemented through original storage that network downloads at remotely record medium or
In nonvolatile machine readable media and the computer code in local recording medium will be stored in, from
And method described here can be stored in use general purpose computer, application specific processor or able to programme
Or the such software processes on the record medium of specialized hardware (such as ASIC or FPGA).Can
To understand, computer, processor, microprocessor controller or programmable hardware include storing or
Receive software or the storage assembly (such as, RAM, ROM, flash memory etc.) of computer code, when
When described software or computer code are by computer, processor or hardware access and execution, it is achieved
This processing method described.Additionally, when general purpose computer accesses for realizing the process being shown in which
Code time, general purpose computer is converted to for performing the process being shown in which by the execution of code
Special-purpose computer.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not
Be confined to this, any those familiar with the art in the technical scope that the invention discloses,
Change can be readily occurred in or replace, all should contain within protection scope of the present invention.Therefore, originally
The protection domain of invention should be as the criterion with described scope of the claims.
Claims (10)
1. the method being used for generating video interception in Android system, it is characterised in that described
Method includes:
Obtain the information of video content；
The sectional drawing obtaining described video content requires information, and described sectional drawing requires that information includes that target is cut
The length and width of figure, initial sectional drawing time point, terminate sectional drawing time point, sectional drawing time interval with
And the information of sectional drawing target directory；
Require that information is primary for parameter call Android with information and the described sectional drawing of described video content
Function, to generate the sectional drawing of multiple described video content, and is stored in described cutting by the sectional drawing of generation
In figure target directory.
Method the most according to claim 1, it is characterised in that the primary function of described Android is
Native_startcutting function.
Method the most according to claim 2, it is characterised in that the information of described video content
Source file information including described video content.
Method the most according to claim 3, it is characterised in that in the described video of described acquisition
The sectional drawing held requires that the process of information includes:
Source file information according to described video content reads described video content and metadata thereof；
Determine described initial sectional drawing time point according to the video duration in described metadata and terminate sectional drawing
Time point.
Method the most according to claim 4, it is characterised in that in the described video of described acquisition
The sectional drawing held requires that the process of information also includes:
From configuration file read the length and width of described target sectional drawing, sectional drawing time interval and/or
The data of sectional drawing target directory described in person, or
Obtain user input the length and width of described target sectional drawing, sectional drawing time interval and/or
The data of sectional drawing target directory described in person.
6. the device being used for generating video interception in Android system, it is characterised in that described
Device includes:
Video content information acquiring unit, for obtaining the information of video content；
Sectional drawing requires information acquisition unit, requires information for obtaining the sectional drawing of described video content,
Described sectional drawing requires that information includes the length and width of target sectional drawing, initial sectional drawing time point, end
Sectional drawing time point, sectional drawing time interval and the information of sectional drawing target directory；
Sectional drawing signal generating unit, for requiring information with the information of described video content and described sectional drawing
For the primary function of parameter call Android, to generate the sectional drawing of multiple described video content, and will generate
Sectional drawing be stored in described sectional drawing target directory.
Device the most according to claim 6, it is characterised in that the primary function of described Android is
Native_startcutting function.
Device the most according to claim 7, it is characterised in that the information of described video content
Source file information including described video content.
Device the most according to claim 8, it is characterised in that described sectional drawing requires that information obtains
Take unit to include:
Digital independent subelement, for regarding described in the source file information reading according to described video content
Frequently content and metadata thereof；
Sectional drawing time point determines subelement, for determining institute according to the video duration in described metadata
State initial sectional drawing time point and terminate sectional drawing time point.
Device the most according to claim 9, it is characterised in that described sectional drawing requires information
Acquiring unit also includes:
Target sectional drawing data acquisition subelement, for reading the length of described target sectional drawing from configuration file
Degree and width, the data of sectional drawing time interval and/or the data of described sectional drawing target directory, or
Person for obtain user input the length and width of described target sectional drawing, sectional drawing time interval and/
Or the data of described sectional drawing target directory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510869062.0A CN105893012A (en) | 2015-12-01 | 2015-12-01 | Method and device for generating video screenshot in Android system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510869062.0A CN105893012A (en) | 2015-12-01 | 2015-12-01 | Method and device for generating video screenshot in Android system |
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| Publication Number | Publication Date |
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| CN105893012A true CN105893012A (en) | 2016-08-24 |
Family
ID=57002898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510869062.0A Pending CN105893012A (en) | 2015-12-01 | 2015-12-01 | Method and device for generating video screenshot in Android system |
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| CN (1) | CN105893012A (en) |
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| CN107153501A (en) * | 2017-06-05 | 2017-09-12 | 深圳天珑无线科技有限公司 | Screenshot method, device, storage medium and electronic equipment |
| CN110162647A (en) * | 2019-04-05 | 2019-08-23 | 三江学院 | A kind of acquisition of image big data and processing method of Java technology |
| CN110876069A (en) * | 2018-08-31 | 2020-03-10 | 广州虎牙信息科技有限公司 | Method, device and equipment for acquiring video screenshot and storage medium |
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Application publication date: 20160824 |