CN105430392A - Image output method with automatic identification of format based on FFMPEG - Google Patents
Image output method with automatic identification of format based on FFMPEG Download PDFInfo
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- CN105430392A CN105430392A CN201510764638.7A CN201510764638A CN105430392A CN 105430392 A CN105430392 A CN 105430392A CN 201510764638 A CN201510764638 A CN 201510764638A CN 105430392 A CN105430392 A CN 105430392A
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Abstract
The present invention provides an image output method with automatic identification of a format based on FFMPEG. The method comprises a step of carrying out initialization operation according to user configuration information to create an image storage thread, a step of sending the YUV data in a frame image based on FFMPEG to the created image storage thread, a step of carrying out image storage operation, and writing image information into the output file in the image storage thread according to the image storage format in the user configuration information, and releasing an occupied resource. According to the method, the real-time storage of a user-defined format and image information is realized, the operation is simple, the image with an established format and resolution can be rapidly stored, the formats of bmp, jpg, jpeg, png, gif and the like are supported, and the complexity of carrying out encoding according to different image formats and carrying out data extraction according to different resolutions is solved.
Description
Technical field
The present invention relates to picture export technique, particularly relate to a kind of image output method of the automatic identification form based on FFMPEG.
Background technology
At present, digitlization, networking, intelligent, visual is social development, the overall trend of intelligent monitoring, the speed that the information that improves to a certain extent is transmitted and quality.Along with the continuous maturation of network market environment, information visualization progressively becomes an one's share of expenses for a joint undertaking indispensable in our life, and a kind of Internet video visualization tool has become the direction of social development and intelligent monitoring.
The information that we will extract by visualization tool in some sense displays in the mode of a kind of picture or video, by shown target or difference, multi-faceted comparison, enable us to our interested position or segment of perception intuitively, very clear, absolutely clear, the sight of people can be attracted fast to pay close attention to and concern dynamics simultaneously.
FFMPEG (FastForwardMovingPictureExpertGroup) is the free platform of increasing income of a video flowing and audio stream, existing people export picture in FFMPEG to be needed to call according to different picture formats the output that diverse ways carries out picture, troublesome poeration, can't carry out the adjustment of resolution to output picture.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of image output method of the automatic identification form based on FFMPEG, call distinct methods according to form in prior art and export the troublesome poeration of picture for solving and the problem of resolution adjustment can not be carried out to exporting picture.
For achieving the above object and other relevant objects, the invention provides a kind of image output method of the automatic identification form based on FFMPEG, comprising:
Carry out initialization operation according to user configuration information and preserve thread to create picture;
Thread is preserved by being sent to created picture based on the yuv data in the two field picture of FFMPEG;
Carry out picture and preserve operation, preserve form according to the picture in described user configuration information and pictorial information write in the output file that described picture preserves in thread; And
Resource shared by release.
Preferably, carry out initialization operation according to user configuration information, comprising:
Read and record the picture preservation form in described user configuration information;
Create picture and preserve thread;
Load FFMPEG storehouse, definition frame space structure body, the data space associated with described frame space structure body, flow structure body, coding structure body and output code flow domain structure body.
Preferably, export file name, original image size and picture are preserved the size picture created along with described yuv data is sent to together and preserve thread.
Preferably, carry out picture and preserve operation, comprise each structure of filling and defining in described initialization operation:
Output code flow domain structure body described in initialization;
Preserve form according to described picture and obtain corresponding coded format, search encoder, and fill described coding structure body;
Preserve form according to described picture and fill described flow structure body, and described encoder is opened.
Preferably, fill described flow structure body to comprise: the mark of filling code check, frame per second, resolution, coded format and the output format in described flow structure body.
Preferably, carry out picture and preserve operation, also comprise the filling of pictorial information:
Definition buffered frame space structure body also applies for the memory headroom needed for a two field picture be associated;
Pictorial information is filled to the memory headroom in described buffered frame space structure body with original image size.
Preferably, pictorial information is filled to the memory headroom in described buffered frame space structure body with original image size, comprises:
Corresponding form, size and data field of filling described buffered frame space structure body.
Preferably, carry out picture and preserve operation, also comprise adjustment resolution:
The first step, judges that whether described original image size is identical with picture preservation size, if identical, performs second step; If not identical, apply for the adjustment memory headroom needed for a two field picture, initialization also applies for adjust structure body, picture is preserved size with described picture and adjusts, discharge described adjust structure body and described adjustment memory headroom;
Second step, preserves with described picture the data space that size is filled to the association of described frame space structure body by described pictorial information, by described buffered frame space structure body and memory headroom associated with it release.
Preferably, carry out picture and preserve operation, also comprise preservation picture:
Output format according to described output code flow domain structure body opens with WriteMode the output file that corresponding described export file name in thread preserved by described picture, if described output file is opened, carries out next step;
Written document head;
Definition is initialization package structure also, carries out Image Coding;
By the write of the packet successfully output file of encoding;
Written document tail.
Preferably, the resource shared by release, comprising:
The data space discharging described frame space structure body and associate with it;
Close the encoder opened;
Close the output file opened;
Discharge described river basin authorities body.
As mentioned above, the image output method of a kind of automatic identification form based on FFMPEG of the present invention, there is following beneficial effect: the image output method of the automatic identification form based on FFMPEG of the present invention, realize preserving User Defined form and pictorial information in real time, simple to operate and the picture of established form and resolution can be recorded fast and effectively, support bmp, jpg, jpeg, png, the forms such as gif, solve and existingly carry out encoding and different resolution being carried out to the complexity of data extraction according to different picture format.Yuv data can be compressed into user-defined form by image output method of the present invention fast, support the conversion of non-geometric ratio resolution, to sample extraction data without the need to user, compatible high, be convenient to other routine calls, call FFMPEG without the need to user and carry out handling procedure, saved user to a great extent and called resource shared by algorithms of different according to filename.
Accompanying drawing explanation
Fig. 1 is shown as the flow chart of the image output method of the automatic identification form based on FFMPEG.
Fig. 2 is shown as the flow chart of step S11 in Fig. 1.
Fig. 3 is shown as the flow chart of step S13 in Fig. 1.
Fig. 4 is shown as the flow chart of step S131 in Fig. 3.
Fig. 5 is shown as the flow chart of step S132 in Fig. 3.
Fig. 6 is shown as the flow chart of step S133 in Fig. 3.
Fig. 7 is shown as the flow chart of step S134 in Fig. 3.
Fig. 8 is shown as the flow chart of step S14 in Fig. 1.
Element numbers explanation
S11 ~ S14 step
S111 ~ S113 step
S131 ~ S134 step
S1311 ~ S1314 step
S1321 ~ S1322 step
S1331 ~ S1333 step
S1341 ~ S1346 step
S141 ~ S144 step
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.It should be noted that, when not conflicting, the feature in following examples and embodiment can combine mutually.
It should be noted that, the diagram provided in following examples only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Refer to Fig. 1, the invention provides a kind of image output method of the automatic identification form based on FFMPEG, realize picture fast and effectively to preserve, solve the trouble calling distinct methods in prior art according to form, also provide possibility for photo resolution transforms simultaneously.The present invention preserves picture automatically according to the given form of user and pictorial information, has scientific and reasonable, simple to operate and record the picture of established form and resolution fast and effectively, supports plurality of picture form.Be described below in conjunction with the image output method of accompanying drawing to the automatic identification form that the present invention is based on FFMPEG.
As shown in Figure 1, the image output method of a kind of automatic identification form based on FFMPEG of the present invention, comprises the steps:
Perform step S11, initialization, initialization operation is carried out according to user configuration information, shown in composition graphs 2, concrete initialization operation comprises: perform step S111, read user configuration information, and form preserved by the picture recorded in user configuration information, the need of conversion of resolution, resolution information after conversion.Perform step S112, create picture and preserve thread.Perform step S113, FFMPEG initialization, structure defines, FFMPEG storehouse loads, initialization, the frame space structure body AVFrame defining a two field picture and the data space linked up with of frame space structure body AVFrame therewith, definition flow structure body AVStream, coding structure body AVCodec, output code flow domain structure body AVFormatContext.Then step S12 is performed.
Perform step S12, yuv data sends, and preserves thread by being sent to the picture created in step S11 based on the yuv data in the two field picture of FFMPEG.After obtaining decoding, code stream is sent to picture and preserves thread.When sending yuv data, export file name, original image size and picture are preserved size and preserve thread along with yuv data is sent to picture together.Then step S13 is performed.
Perform step S13, picture is preserved, and carries out picture and preserves operation, preserves form to be written to by pictorial information in the output file that picture preserves in thread according to the picture in user configuration information.Shown in composition graphs 3, the concrete steps that picture is preserved comprise: perform step S131, and the application of structure space, assignment, fill each structure defined in initialization operation; Perform step S132, pictorial information is filled; Perform step S133, resolution adjustment; Perform step S134, picture is preserved.
Shown in composition graphs 4, step S131 comprises following flow process: perform step S1311, the application of river basin authorities body space, assignment, application is initialization output code flow domain structure body AVFormatContext also, opens editing machine and fills output code flow domain structure body AVFormatContext; Perform step S1312, the application of coding structure body space, assignment, preserve form according to picture and obtain coded format, search editing machine, fill coding structure body AVCodec; Perform step S1313, newly-built stream also fills flow structure body, preserve form according to picture and fill flow structure body AVStream, fill the mark of code check, frame per second, resolution (resolution after adjustment), coded format and the output format in flow structure body; Perform step S1314, encoder is opened.
Shown in composition graphs 5, step S132 comprises following flow process: perform step S1321, the definition of frame structure body, space application, and definition buffered frame space structure body also applies for the memory headroom needed for a two field picture be associated with buffered frame space structure body; Perform step S1322, frame structure body assignment, fill the form of buffered frame structure, size and data field, pictorial information correspondence is filled the form of buffered frame space structure body, size and data field.
Shown in composition graphs 6, step S133 comprises following flow process: perform step S1331, judge that whether original size is identical with target size, if then perform step S1333, then performs step S1332 if not.Check that resolution or data format are the need of adjustment, by judging that whether original image size is identical with picture preservation size, just not needing adjustment if identical, just needing adjustment if not identical, when needs adjustment just performs step S1332, just perform step S1333 when not needing adjustment.Perform step S1332, dimension of picture adjusts, the adjustment memory headroom needed for a two field picture after application adjustment, initialization also applies for structure SwsContext, picture is preserved size with picture adjust, by picture stretch processing, then discharge the structure SwsContext of application.Perform step S1333, frame structure body is filled, and pictorial information is preserved size with chart and is filled to the frame space structure body AVFrame applied in step S113 and the data space linked up with therewith, buffer release frame space structure body and memory headroom associated with it.
Shown in composition graphs 7, step S134 comprises following flow process: perform step S1341, judges whether preserve file opens, and if so, then represents that preserving file opens, and then performs step S1343; If not, then represent that preserving file does not open, and then performs step S1342.Particularly, check whether open output file according to the output format sign A VFM_NOFILE of the river basin authorities body AVFormatCnotext of output code flow.Perform step S1342, open preservation file, open output file with WriteMode, then perform step S1344.Perform step S1343, according to form written document head.Perform step S1344, according to said shank image, definition is initialization package structure AVPaket also, Image Coding.Perform step S1345, write encoded images data, by the write of the packet successfully output file of encoding.Perform step S1346, written document tail.
Perform step S14, resource discharges, the resource shared by release.Shown in composition graphs 8, resource release comprises: perform step S141, and the frame space structure body of release application and buffering, discharge the frame space structure body applied in step S113 and the data space that associates with it; Perform step S142, encoder cuts out, and the encoder opened by step S1314 cuts out; Perform step S143, closing output file, close the output file opened in step S134; Perform step S144, the river basin authorities body of release application, the output code flow domain structure body AVFormatContext applied in release steps S1311.
Be described with example below.
First, carry out initialization: read user profile, the form that recordable picture is preserved, resolution information after conversion.Create picture and preserve thread.FFMPEG storehouse loads, initialization, definition frame space structure body AVFrame*pPICSWS and therewith AVFrame hook data space * pBufSWS, definition flow structure body AVStream*pStream, coding structure body AVCodec*pCodec, output code flow domain structure body AVFormatContext*pFormatCtx.
Then, transmission yuv data and new pictorial information (preserving rear filename, resolution) preserve thread to picture.
Then, picture is preserved.
The first, the structure of definition is filled:
The river basin authorities body of initialization output code flow,
avformat_alloc_output_context2(&pFormatCtx,NULL,NULL,pFileName)；
Preserve form according to picture, obtain coded format, search encoder, fill encoding and decoding structure AVCodec.
emCodecID＝av_guess_codec()；pCodec＝avcodec_find_encoder(emCodecID)；
Newly-built stream also fills flow structure body AVStream according to preservation picture format.
pStream＝avformat_new_stream(pFormatCtx,pCodec)；
Fill the code check in pStream structure, frame per second, resolution (resolution after adjustment), the mark of coded format and output format.
pStream->codec->flags|＝CODEC_FLAG_GLOBAL_HEADER；
Open encoder.avcodec_open2(pStream->codec,pCodec,NULL)；
The second, pictorial information is filled:
Definition frame space structure also applies for a two field picture required memory space
AVFrame*pPIC，uint8_t*pBuf。
pPIC＝av_frame_alloc()；
avpicture_get_size(PIX_FMT_YUVJ420P,Width,Height)；
pBuf＝(uint8_t*)av_malloc(s32PicSize)；
Width wherein, Height and s32PicSize are original image size.Fill the form PIX_FMT_YUVJ420P of the frame space structure body AVFrame just applied for, size and data field.
3rd, resolution adjustment:
Check that resolution or data format are the need of adjustment, need, perform adjustment resolution, otherwise skip resolution adjustment and perform next step.
Adjustment resolution, the two field picture required memory space after application adjustment, initialization also applies for structure SwsContext, picture stretch processing, release SwsContext.
sws_getContext()；sws_scale()；sws_freeContext。
Fill first definition structure fill in application frame space structure and in this hook data message and discharge second picture information fill in application frame space structure body and in this hook data buffering.
pPICSWS＝pPIC；pBufSWS＝pBuf。
4th, preserve picture:
Check and whether open output file, if do not open, open output file with WriteMode, if open output file, carry out written document head.Output file is opened with WriteMode:
avio_open(&pFormatCtx->pb,pFileName,AVIO_FLAG_WRITE)；
Written document head.avformat_write_header(pFormatCtx,NULL)；
Definition is initialization package structure AVPaket also, Image Coding.
AVPacketpkt＝{0}；av_init_packet(&pkt)；
avcodec_encode_video2()；
By the write of the packet successfully output file of encoding.
av_interleaved_write_frame(pFormatCtx,&pkt)；
Written document tail.
av_write_trailer(pFormatCtx)；
Finally, resource reclaim:
The frame space structure body that release is applied for and the data buffering linked up with therewith.
av_frame_free(&pPICSWS)；
av_free(pBufSWS)；
Close the encoder opened.
avcodec_close(pStream->codec)；
Close the output file opened.
avio_closep(&pFormatCtx->pb)；
The river basin authorities body of release application.
avformat_free_context(pFormatCtx)；
In sum, the present invention is based on the image output method of the automatic identification form of FFMPEG, fast yuv data can be compressed into User Defined form; Support the conversion of non-geometric ratio resolution, to sample extraction data without the need to user; Compatible high, be convenient to other routine calls, call FFMPEG without the need to user and carry out handling procedure; Save user to a great extent and call resource shared by algorithms of different according to filename.The present invention preferably resolves and existingly carries out encoding and different resolution being carried out to the complexity of data extraction according to different picture format.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1., based on an image output method for the automatic identification form of FFMPEG, it is characterized in that, comprising:
Carry out initialization operation according to user configuration information and preserve thread to create picture;
Thread is preserved by being sent to created picture based on the yuv data in the two field picture of FFMPEG;
Carry out picture and preserve operation, preserve form according to the picture in described user configuration information and pictorial information write in the output file that described picture preserves in thread; And
Resource shared by release.
2., as claimed in claim 1 based on the image output method of the automatic identification form of FFMPEG, it is characterized in that, carry out initialization operation according to user configuration information, comprising:
Read and record the picture preservation form in described user configuration information;
Create picture and preserve thread;
Load FFMPEG storehouse, definition frame space structure body, the data space associated with described frame space structure body, flow structure body, coding structure body and output code flow domain structure body.
3. as claimed in claim 2 based on the image output method of the automatic identification form of FFMPEG, it is characterized in that, export file name, original image size and picture are preserved the size picture created along with described yuv data is sent to together and preserve thread.
4. as claimed in claim 3 based on the image output method of the automatic identification form of FFMPEG, it is characterized in that, carry out picture and preserve operation, comprise each structure of filling and defining in described initialization operation:
Output code flow domain structure body described in initialization;
Preserve form according to described picture and obtain corresponding coded format, search encoder, and fill described coding structure body;
Preserve form according to described picture and fill described flow structure body, and described encoder is opened.
5., as claimed in claim 4 based on the image output method of the automatic identification form of FFMPEG, it is characterized in that, fill described flow structure body and comprise: the mark of filling code check, frame per second, resolution, coded format and the output format in described flow structure body.
6. as claimed in claim 4 based on the image output method of the automatic identification form of FFMPEG, it is characterized in that, carry out picture and preserve operation, also comprise the filling of pictorial information:
Definition buffered frame space structure body also applies for the memory headroom needed for a two field picture be associated;
Pictorial information is filled to the memory headroom in described buffered frame space structure body with original image size.
7., as claimed in claim 6 based on the image output method of the automatic identification form of FFMPEG, it is characterized in that, pictorial information is filled to the memory headroom in described buffered frame space structure body with original image size, comprises:
Corresponding form, size and data field of filling described buffered frame space structure body.
8. as claimed in claim 6 based on the image output method of the automatic identification form of FFMPEG, it is characterized in that, carry out picture and preserve operation, also comprise adjustment resolution:
The first step, judges that whether described original image size is identical with picture preservation size, if identical, performs second step; If not identical, apply for the adjustment memory headroom needed for a two field picture, initialization also applies for adjust structure body, picture is preserved size with described picture and adjusts, discharge described adjust structure body and described adjustment memory headroom;
Second step, preserves with described picture the data space that size is filled to the association of described frame space structure body by described pictorial information, by described buffered frame space structure body and memory headroom associated with it release.
9. as claimed in claim 8 based on the image output method of the automatic identification form of FFMPEG, it is characterized in that, carry out picture and preserve operation, also comprise preservation picture:
Output format according to described output code flow domain structure body opens with WriteMode the output file that corresponding described export file name in thread preserved by described picture, if described output file is opened, carries out next step;
Written document head;
Definition is initialization package structure also, carries out Image Coding;
By the write of the packet successfully output file of encoding;
Written document tail.
10., as claimed in claim 9 based on the image output method of the automatic identification form of FFMPEG, it is characterized in that, the resource shared by release, comprising:
The data space discharging described frame space structure body and associate with it;
Close the encoder opened;
Close the output file opened;
Discharge described river basin authorities body.
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Application publication date: 20160323 |