CN106372005B - The method and device of image data is accessed in IOS system using external memorizer - Google Patents
The method and device of image data is accessed in IOS system using external memorizer Download PDFInfo
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- CN106372005B CN106372005B CN201610835098.1A CN201610835098A CN106372005B CN 106372005 B CN106372005 B CN 106372005B CN 201610835098 A CN201610835098 A CN 201610835098A CN 106372005 B CN106372005 B CN 106372005B
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- G06F12/02—Addressing or allocation; Relocation
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Abstract
The present invention relates to a kind of method for accessing image data in IOS system using external memorizer, include the following steps: to obtain the raw image data of camera output in IOS system, and is sent to the first coding unit and is handled；The image data of the feeding is converted to standard, audio/video file convenient for storage and output by first coding unit；First lookup function of calling system and first writes function the file of the encoder output is written to external memorizer.The invention further relates to a kind of devices for realizing the above method.Implement the method and device of the invention for accessing image data in IOS system using external memorizer, has the advantages that the access for the image data in external memorizer becomes very fast, is relatively easy to.
Description
Technical field
The present invention relates to the processing of image data and transmission, use external memorizer in IOS more specifically to a kind of
The method and device of image data is accessed in system.
Background technique
Intelligent mobile communication terminal (smart phone) is often equipped with operating system, and these smart phones are mobile mutual
The application of the important component of networking, many mobile Internets is realized on smart phone.For now, intelligence
Operating system on mobile phone is generally divided into the IOS system on Apple Inc. iphone and the peace on other smart phones
Tall and erect system.It is different from open Android system, due to the closure of IOS system, although safety is higher (not due to source code
It is open, so that the difficulty of hacker attack increases), but much common method or configuration may become tired in Android system
Difficulty, for example, the use for external memorizer.In IOS system, external memorizer is not the configuration of its standard, in IOS system
System is all with the memory of the internal system for place there is no such configuration, the function of encapsulating in operation or function is considered
Set object.So reading data or write-in data either in external memorizer or in APP using in external memorizer
Data, all become more difficult, the speed for obtaining image data is also slack-off, this image APP for requiring reading speed
It is totally unfavorable.
Summary of the invention
The technical problem to be solved in the present invention is that for the above-mentioned picture number using in external memorizer of the prior art
Relatively slow, the more difficult defect according to speed, provide a kind of reading speed it is very fast, using being relatively easy to exist using external memorizer
The method and device of image data is accessed in IOS system.
The technical solution adopted by the present invention to solve the technical problems is: construct it is a kind of using external memorizer in IOS system
The method that image data is accessed in system, includes the following steps:
A the raw image data of camera output in IOS system) is obtained, and is sent at the first coding unit
Reason；
B) image data of the feeding is converted to standard, audio/video file convenient for storage by first coding unit
And it exports；
C) calling system first lookup function and first write function the file of the encoder output is written to it is external
Memory；
Wherein, the first lookup function and first to write function be initial in IOS system in first coding unit
When change, the lookup function of the IOS system and writing is obtained after function is modified, described first searches function for external
Memory addressing is connect, described first writes the specified region that the external memorizer is written in the input of the encoder by function.
Further, described first write function and first lookup function using adjust back by the way of call the external storage
The privately owned of device writes function and searches function, so that the external memorizer is write direct in the output of the encoder.
Further, for first coding unit in initialization, privately owned using the external memorizer writes letter
Number and search function pointer substitute the IOS system write function and search function, obtain described first and write function and first
Search function.
Further, first coding unit includes the FFMPEG of H.264 encoder, ACC encoder and open source
Muxer (audio-video multiplexer, audio-video document is merged) is obtained and defeated after first coding unit processing
File out is MOV file.
Further, further include following steps:
M) application program, which requires to obtain, is stored in audio/video file in the external memorizer, and sends the requirement to described
First coding unit；
N) first coding unit obtains ground of the audio/video file in external memorizer using the first lookup function
Location, and the audio/video file on the address is got in the IOS system by the first reading function, it decodes it and is output to institute
State application program；
Wherein, the first reading function is when first coding unit initializes in IOS system, to the IOS
What the reading function of system obtained after modifying.
Further, the first reading function calls the privately owned reading letter of the external memorizer by the way of readjustment
Number, so that file is directly read in the IOS system by the external memorizer by the coding unit.
Further, the encoder uses the finger of the privately owned reading function of the external memorizer in initialization
Needle substitutes the reading function of the IOS system, obtains described first and reads function.
The invention further relates to a kind of devices for realizing the above method, comprising:
Raw image data acquisition unit: the raw image data exported for obtaining camera in IOS system, and by its
The first coding unit is sent into be handled；
Image data conversion unit: for making first coding unit that the image data of the feeding is converted to standard
, audio/video file convenient for storage and output；
Writing unit: the first lookup function and first for calling system writes function for the file of the encoder output
It is written to external memorizer；
Wherein, the first lookup function and first to write function be initial in IOS system in first coding unit
When change, the lookup function of the IOS system and writing is obtained after function is modified, described first searches function for external
Memory addressing is connect, described first writes the specified region that the external memorizer is written in the input of the encoder by function.
Further, described first write function and first lookup function using adjust back by the way of call the external storage
The privately owned of device writes function and searches function, so that the external memorizer is write direct in the output of the encoder；The volume
Code device substitutes the IOS system in initialization, using the privately owned pointer write function and search function of the external memorizer
System writes function and lookup function, obtains described first and writes function and the first lookup function.
Further, further includes:
Request of data unit: being stored in audio/video file in the external memorizer for making application program require to obtain, and
First coding unit is sent by the requirement；
Data acquisition unit: exist for making first coding unit obtain the audio/video file using the first lookup function
Address in external memorizer, and the audio/video file on the address is got in the IOS system by the first reading function, it will
It decodes and is output to the application program；
Wherein, the first reading function is when first coding unit initializes in IOS system, to the IOS
What the reading function of system obtained after modifying.
Implement the method and device of the invention for accessing image data in IOS system using external memorizer, have with
Down the utility model has the advantages that all being used due to storing image data using external memorizer or obtaining image data by external memorizer
First coding unit, and when the first coding unit is initialized in IOS system, in advance in IOS system lookup function,
It writes function and reads function and modify, obtain the first lookup function, first write function and first and read function, meanwhile, it is logical in data
When crossing above-mentioned first coding unit, be all using it is above-mentioned first lookup function, first write function and first read function to data into
Row processing, and these functions are all the privately owned lookup that external memorizer is directly used by way of readjustment, write and read letter
Number, so, it when handling image data in IOS system, simply can directly be interacted with external memorizer, therefore it is read
Taking becomes very fast, is relatively easy to.
Detailed description of the invention
Fig. 1 is that the present invention is accessed in the method and device embodiment of image data using external memorizer in IOS system
Store the method flow diagram of image data；
Fig. 2 is the flow chart that image data location parameter is obtained in the embodiment；
Fig. 3 is the structural schematic diagram of device in the embodiment.
Specific embodiment
Below in conjunction with attached drawing, embodiments of the present invention is further illustrated.
As shown in Figure 1, in the method and device of the invention for accessing image data in IOS system using external memorizer
In embodiment, include the following steps: in the method for accessing image data in IOS system using external memorizer
Step S11 obtains raw image data and is sent to coding unit: in the present embodiment, operating in IOS with one
For the application program (APP) that image in system is obtained and played, illustrate to carry out figure using external memorizer in IOS system
The method for storing as data and obtaining image data in external memorizer.Generally, in a manner of application program (APP)
In the presence of with for the program in IOS system, when the application program brings into operation, need to the application program and component therein
Initialization process is carried out, is in other words that parameter configuration is carried out to the application program, enables the application program in IOS system ring
It is operated under border.In the present embodiment, which includes first coding unit, and similarly, first coding is single
Member is when APP is run, it is also desirable to the operation initialized to it.In this step, enter production after APP starting or record
Or when shooting state, can activate in the presence of and the camera in IOS system, then obtain IOS system in camera output it is original
Image data, and be sent to the first coding unit and handled.It is noted that in this step, obtained data are just
It is that camera obtains the initial data exported after image, does not process.
Step S12 coding unit handles raw image data, obtains audio-video file: in this step, above-mentioned
One coding unit by the image data for being obtained by camera and being transmitted be converted to standard, convenient for storage audio/video file simultaneously
Output.In general, coding unit is exactly that image data or audio data (are obtained image in camera in many cases,
While data.The audio data of environment where microphone also obtains) it is encoded, make it according to the time sequencing of acquirement, shape
At the data flow of certain format, then the data flow will be output to a specified storage region and store.Generally,
The storage region can be the memory of the equipment of operation IOS system itself, be also possible to external memorizer.But in existing skill
In art, usually all it is stored on the memory of the equipment of operation IOS system itself, because due to the closure of IOS system, it is real
It is relatively difficult that now data, which are directly stored on external memorizer,.
Obtained audio-video file is directly stored in external memorizer by modified function of writing by step S13: in this step
In rapid, the first lookup function of IOS system and first is called to write function the file of the encoder output is written to external deposit
Reservoir；Specifically, it is above-mentioned first lookup function and first write function be actually IOS system is encapsulated in the application interface
Lookup function (SEEK) and write obtained from function (WRITE) modifies.When above-mentioned APP is initialized in IOS system,
To the lookup function in the application interface for calling or occupying and write function and modify, then obtain above-mentioned first search function and
First writes function.In other words, it is above-mentioned first lookup function and first write function only exist in the application interface, also only
It is to be played a role using application interface Shi Caineng.For the other applications in the IOS system, due to using not
With application interface, so, above-mentioned first lookup function and first writes function and is not used in other applications, also answers other
It is impacted with program.In the present embodiment, above-mentioned first, which searches function, is used for external memory addressing, and first writes function general
The specified region of the external memorizer is written in the input of the encoder.
In the present embodiment, above-mentioned first function and the first lookup function are write using calling described external deposit by the way of adjusting back
The privately owned of reservoir writes function and searches function, so that the external memorizer is write direct in the output of the encoder.Exist
In the present embodiment, above-mentioned first coding unit in initialization, write function and search function by privately owned using external memorizer
Pointer (function pointer) substitute the content write function and search function of the IOS system, obtain described first write function and
First searches function.In this way, obtaining the privately owned of above-mentioned external memorizer when APP writes function by application interface calling first
The function pointer for writing function, according to the pointer, calling be above-mentioned external memorizer function of writing, then by data content or
Audio-video file writes direct external memorizer.
In the present embodiment, the first coding unit includes the FFMPEG of H.264 encoder, ACC encoder and open source
Muxer, the file for obtaining and exporting after first coding unit processing is MOV file.That is, in IOS system
In, image data is obtained by camera and microphone respectively and audio data is turned after above-mentioned first coding unit
It changes the stream file including image data and audio data into, is directly stored on above-mentioned external memorizer.Certainly, some
In the case of, above-mentioned acquirement data can also only have image data, because being not whenever to require to obtain audio data.
Refer to Fig. 2, in the present embodiment, when above-mentioned APP is used as a player, can also directly by
Data are obtained in external memorizer to play out.Its step includes:
Step S21 transmission obtains the requirement of image data to coding unit: when above-mentioned APP is used as a player or
When realizing the function of a player, played file should be it is appointed, when the file for being designated to play be stored in it is outer
When connecing on memory, application program just may require that acquirement is stored in audio/video file in the external memorizer, and the requirement is sent out
It is sent to first coding unit；Then, the first coding unit will learn the filename and storage location of played file.
Step S22 finds the audio-video file being required: in this step, first coding unit is knowing file institute
Position (position may be specific storage address, it is also possible to only only point out a storage region) after, use
First lookup function obtains address of the audio/video file in external memorizer.In other words, above-mentioned first lookup function will
Determine physical address that need to read file, specific.Similarly, above-mentioned first lookup function can directly confirm external storage
Physical address in device, that is, realize the storage address mapping of external memorizer.
Step S23 directly obtains the audio-video file on external memorizer by modified reading function, is transmitted directly to compile
Code unit be decoded: in this step, by the audio/video file on determining physical address by first reading function get described in
In IOS system, decodes it and be output to the application program.In this city embodiment, first, which reads function, uses address above mentioned,
Directly by reading file in external memorizer.
It is wherein write as function with above-mentioned first lookup function and first, the first reading function is also in first coding
When unit initializes in IOS system, by muxer reading function modification, and then realize to the IOS system,
Be encapsulated in the application interface that the application program uses reading function modify after obtain.
Similarly, the first reading function calls the privately owned reading function of the external memorizer by the way of readjustment, so that
File is directly read in the IOS system by the external memorizer by the coding unit.The encoder makes in initialization
The reading function that the IOS system is substituted with the pointer of the privately owned reading function of the external memorizer obtains described first and reads letter
Number.Above-mentioned first reading function does not interfere with the other application in IOS system equally.
After file enters IOS system and is decoded as data as the data that other read in IOS system, it will usually
A set of file system mapping is added in system RAM, after user's operation, using the privately owned read-write interface of external memory, is write
Into corresponding sevtor address.
As shown in figure 3, further relating to a kind of device for realizing the above method in the present embodiment, including raw image data takes
Obtain unit 1, image data conversion unit 2, writing unit 3, request of data unit 4 and data acquisition unit 5；Wherein, original
Image data acquisition unit 1 is used to obtain the raw image data that camera exports in IOS system, and is sent to the first coding
Unit is handled；Image data conversion unit 2 is used to that first coding unit to be made to convert the image data of the feeding
Audio/video file for standard, convenient for storage and output；First lookup function and first of the writing unit 3 for calling system is write
The file of the encoder output is written to external memorizer by function；Request of data unit 4 is for seek application program
It must be stored in audio/video file in the external memorizer, and send first coding unit for the requirement；Data obtain single
Member 5 is for making first coding unit obtain ground of the audio/video file in external memorizer using the first lookup function
Location, and the audio/video file on the address is got in the IOS system by the first reading function, it decodes it and is output to institute
State application program
Wherein, the first lookup function and first to write function be initial in IOS system in first coding unit
When change, the lookup function of the IOS system and writing is obtained after function is modified, described first searches function for external
Memory addressing is connect, described first writes the specified region that the external memorizer is written in the input of the encoder by function；Together
Sample, the first reading function is the reading when first coding unit initializes in IOS system, to the IOS system
What function obtained after modifying.Described first writes function and the first lookup function using calling described external deposit by the way of adjusting back
The privately owned of reservoir writes function and searches function, so that the external memorizer is write direct in the output of the encoder；It is described
Encoder substitutes the IOS in initialization, using the privately owned pointer write function and search function of the external memorizer
System writes function and lookup function, obtains described first and writes function and the first lookup function.
In general, in IOS system, application program is read and write nothing more than for the operation of file, this is file
The basic unit of operation, so read-write operation (read/write function) has all been encapsulated in major applications interface, in current behaviour
To make under system, the object of read-write all can only be the file object under this system file system, for external storage object, due to
The closure of ios system, user can only be after the file to be operated is copied in ios system by privately owned interface, to system
In duplication file operated.After the completion of access, then file write back into external memory by privately owned interface.
Recording for video file, usually because the recording interface that iOS is provided has 2 kinds, the first is that real-time provide is adopted
The video original data of collection caches；The second is that filename is provided by user, after system compresses the data encoding of acquisition, is protected
It is stored in file.Because external memory, not in the file system of ios, the interface of system can not directly save file
In the prior art it is essentially all first system to be allowed to be saved in the file system of ios into external memory, then reuses outer
The read-write interface of portion's memory, file by being moved in the file system of external access device in ios file system.
Because above-mentioned second situation lower interface is ios packaged, the file system of ios can only be written, have no idea
Do secondary encapsulation.Therefore after the video data that the system of acquirement provides, using H264 and AAC encoder, by audio, video data into
Row coding.In the present embodiment, file, is mixed into the MOV file of standard by the muxer function of having selected the FFMPEG of open source,
Meanwhile by the way of readjustment, the write function and seek function of FFMPEG are Resealed, otherwise the app under ios is also
It is that will use write the and seek function of ios operating system to write under the file system of ios.We are in ffmpeg library initialization
When, write the and seek function of system is replaced with customized write and seek function pointer, such muxer exists
When calling write and seek, write the and seek function of oneself encapsulation in advance will be adjusted back, in the write of oneself encapsulation
In seek function, in external memory that the data after muxer are directly write to, the direct guarantor of entire data recording is realized
It deposits.The callback interface for similarly utilizing ffmpeg, has replaced read and seek function, real with customized read and seek function
The reading for having showed external access device allows system that can directly play the video file in external access device.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of method for accessing image data in IOS system using external memorizer, which is characterized in that including walking as follows
It is rapid:
A) application program obtain IOS system in camera output raw image data, and be sent to the first coding unit into
Row processing；
B) first coding unit by the image data of the feeding be converted to standard, convenient for the audio/video file of storage and defeated
Out；
C) calling system first lookup function and first write function by the file that first coding unit export be written to outside
Connect memory；
Wherein, first coding unit is present in the application program, and the first lookup function and first writes function and is
When first coding unit initializes in IOS system, to the IOS system by the application interface of the application call
Lookup function and writing obtained after function is modified, the first lookup function is on the application interface to external for depositing
Reservoir addressing, described first writes function on the application interface that the output write-in of first coding unit is described external
The specified region of memory.
2. the method according to claim 1 for being accessed image data in IOS system using external memorizer, feature are existed
In described first writes function and the first lookup function using calling the privately owned of the external memorizer to write function by the way of adjusting back
With search function so that the external memorizer is write direct in the output of first coding unit.
3. the method according to claim 2 for being accessed image data in IOS system using external memorizer, feature are existed
In first coding unit uses the privately owned finger write function and search function of the external memorizer in initialization
Needle substitute the IOS system write function and search function, obtain described first write function and first search function.
4. the method according to claim 1 for being accessed image data in IOS system using external memorizer, feature are existed
In first coding unit includes the muxer of the H.264 FFMPEG of encoder, ACC encoder and open source, by described
The file for obtaining and exporting after the processing of one coding unit is MOV file.
5. the side according to any one of claims 1-4 for accessing image data in IOS system using external memorizer
Method, which is characterized in that further include following steps:
M) application program, which requires to obtain, is stored in audio/video file in the external memorizer, and sends described first for the requirement
Coding unit；
N) first coding unit obtains address of the audio/video file in external memorizer using the first lookup function, and
Audio/video file on the address is got in the IOS system by the first reading function, decodes it and is output to described answer
Use program；
Wherein, the first reading function is when first coding unit initializes in IOS system, to the IOS system
Reading function modify after obtain.
6. the method according to claim 5 for being accessed image data in IOS system using external memorizer, feature are existed
In the first reading function calls the privately owned reading function of the external memorizer by the way of readjustment, so that described first
File is directly read in the IOS system by the external memorizer by coding unit.
7. the method according to claim 6 for being accessed image data in IOS system using external memorizer, feature are existed
In first coding unit is in initialization, described in the pointer substitution using the privately owned reading function of the external memorizer
The reading function of IOS system obtains described first and reads function.
8. a kind of realize the dress as described in claim 1 for accessing image data method in IOS system using external memorizer
It sets characterized by comprising
Raw image data acquisition unit: for making application program obtain the raw image data of camera output in IOS system,
And it is sent to the first coding unit and is handled；
Image data conversion unit: for make first coding unit by the image data of the feeding be converted to standard,
Audio/video file and output convenient for storage；
Writing unit: the text that function exports first coding unit is write for the first lookup function of calling system and first
Part is written to external memorizer；
Wherein, first coding unit is present in the application program, and the first lookup function and first writes function and is
When first coding unit initializes in IOS system, to the IOS system by the application interface of the application call
Lookup function and writing obtained after function is modified, the first lookup function is on the application interface to external for depositing
Reservoir addressing, described first writes function on the application interface that the output write-in of first coding unit is described external
The specified region of memory.
9. device according to claim 8, which is characterized in that described first, which writes function and first, searches function using readjustment
Mode call the privately owned of the external memorizer to write function and search function so that the output of first coding unit is straight
Connect the write-in external memorizer；First coding unit in initialization, write by privately owned using the external memorizer
Function and the pointer for searching function substitute writing function and searching function for the IOS system, obtain described first and write function and the
One searches function.
10. device according to claim 9, which is characterized in that further include:
Request of data unit: it is stored in audio/video file in the external memorizer for making application program require to obtain, and should
It is required that being sent to first coding unit；
Data acquisition unit: the audio/video file is obtained external for making first coding unit search function using first
Address in memory, and the audio/video file on the address is got in the IOS system by the first reading function, it is solved
Code is simultaneously output to the application program；
Wherein, the first reading function is when first coding unit initializes in IOS system, to the IOS system
Reading function modify after obtain.
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