ffmpeg 예제 소스 분석

[링크 : https://github.com/mpenkov/ffmpeg-tutorial/blob/master/tutorial01.c]

사용된 헤더별 구조체

libavcodec/avcodec.h - AVCodecContext - AVCodec - AVPacket libavformat/avformat.h - AVFormatContext libswscale/swscale_internal.h ?? - SwsContext  libavutil/frame.h from libavcodec/avcodec.h - AVFrame libavutil/dict.h - AVDictionary

av_register_all() // Initialize libavformat and register all the muxers, demuxers and protocols. avformat_open_input() avformat_find_stream_info() av_dump_format() avcodec_find_decoder() avcodec_open2() av_frame_alloc() avpicture_get_size() av_malloc() sws_getContext() avpicture_fill() while(av_read_frame()) avcodec_decode_video2() sws_scale() av_free_packet() av_free() avcodec_close() avformat_close_input()

AVFormatContext *pFormatCtx = NULL; AVCodecContext  *pCodecCtx = NULL; AVCodec         *pCodec = NULL; AVFrame         *pFrame = NULL;  AVFrame         *pFrameRGB = NULL; AVPacket        packet; AVDictionary    *optionsDict = NULL; struct SwsContext      *sws_ctx = NULL; av_register_all(); avformat_open_input(&pFormatCtx, argv[1], NULL, NULL); avformat_find_stream_info(pFormatCtx, NULL); av_dump_format(pFormatCtx, 0, argv[1], 0); pCodecCtx=pFormatCtx->streams[videoStream]->codec; pCodec=avcodec_find_decoder(pCodecCtx->codec_id); avcodec_open2(pCodecCtx, pCodec, &optionsDict) pFrame=av_frame_alloc(); pFrameRGB=av_frame_alloc(); numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height); buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t)); sws_ctx = sws_getContext(     pCodecCtx->width,     pCodecCtx->height,     pCodecCtx->pix_fmt,     pCodecCtx->width,     pCodecCtx->height,     PIX_FMT_RGB24,     SWS_BILINEAR,     NULL,     NULL,     NULL    ); avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height); while(av_read_frame(pFormatCtx, &packet)>=0) { avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,  &packet); av_free_packet(&packet); } av_free(buffer); av_free(pFrameRGB); av_free(pFrame); avcodec_close(pCodecCtx); avformat_close_input(&pFormatCtx);

void av_register_all (void)

// Initialize libavformat and register all the muxers, demuxers and protocols.

[링크 : https://www.ffmpeg.org/.../group__lavf__core.html#ga917265caec45ef5a0646356ed1a507e3]

int avformat_open_input (AVFormatContext ** ps,

const char * url,

AVInputFormat * fmt,

AVDictionary ** options 

)

[링크 : https://www.ffmpeg.org/.../group__lavf__decoding.html#ga31d601155e9035d5b0e7efedc894ee49]

void avformat_close_input (AVFormatContext ** s)

[링크 : https://www.ffmpeg.org/.../group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4]

int avformat_find_stream_info ( AVFormatContext * ic, AVDictionary ** options )

// Read packets of a media file to get stream information.

[링크 : https://www.ffmpeg.org/.../group__lavf__decoding.html#gad42172e27cddafb81096939783b157bb]

void av_dump_format ( AVFormatContext * ic,

int index,

const char * url,

int is_output 

)

//Print detailed information about the input or output format, such as duration, bitrate, streams, container, programs, metadata, side data, codec and time base.

[링크 : https://www.ffmpeg.org/.../group__lavf__misc.html#gae2645941f2dc779c307eb6314fd39f10]

AVCodec* avcodec_find_decoder ( enum AVCodecID id )

// Find a registered decoder with a matching codec ID.

[링크 : https://www.ffmpeg.org/.../group__lavc__decoding.html#ga19a0ca553277f019dd5b0fec6e1f9dca]

int avcodec_open2 ( AVCodecContext * avctx,

const AVCodec * codec,

AVDictionary ** options 

)

// Initialize the AVCodecContext to use the given AVCodec.

// Warning - This function is not thread safe!

[링크 : https://www.ffmpeg.org/.../group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d]

AVFrame* av_frame_alloc ( void )

// Allocate an AVFrame and set its fields to default values.

[링크 : https://www.ffmpeg.org/doxygen/3.2/group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f]

attribute_deprecated int avpicture_get_size ( enum AVPixelFormat pix_fmt,

int width,

int height 

)

[링크 : https://www.ffmpeg.org/doxygen/3.2/group__lavc__picture.html#gad2eba60171ee81107d2ca3a6957f4f2d]

int av_image_get_buffer_size ( enum AVPixelFormat pix_fmt,

int width,

int height,

int align 

)

[링크 : https://www.ffmpeg.org/doxygen/3.2/group__lavu__picture.html#ga24a67963c3ae0054a2a4bab35930e694]

void* av_malloc ( size_t size )

[링크 : https://www.ffmpeg.org/.../group__lavu__mem__funcs.html#ga9722446c5e310ffedfaac9489864796d]

struct SwsContext* sws_getContext ( int srcW,

int srcH,

enum AVPixelFormat srcFormat,

int dstW,

int dstH,

enum AVPixelFormat dstFormat,

int flags,

SwsFilter * srcFilter,

SwsFilter * dstFilter,

const double * param 

)

[링크 : https://www.ffmpeg.org/doxygen/3.2/group__libsws.html#gaf360d1a9e0e60f906f74d7d44f9abfdd]

attribute_deprecated int avpicture_fill ( AVPicture * picture,

const uint8_t * ptr,

enum AVPixelFormat pix_fmt,

int width,

int height 

)

[링크 : https://www.ffmpeg.org/doxygen/3.2/group__lavc__picture.html#gab740f592342cbbe872adf3e85c52e40c]

int av_image_fill_arrays ( uint8_t * dst_data[4],

int dst_linesize[4],

const uint8_t * src,

enum AVPixelFormat pix_fmt,

int width,

int height,

int align 

)

[링크 : https://www.ffmpeg.org/doxygen/3.2/group__lavu__picture.html#ga5b6ead346a70342ae8a303c16d2b3629]

int av_read_frame ( AVFormatContext * s,

AVPacket * pkt 

)

[링크 : https://www.ffmpeg.org/doxygen/3.2/group__lavf__decoding.html#ga4fdb3084415a82e3810de6ee60e46a61]

attribute_deprecated int avcodec_decode_video2 ( AVCodecContext * avctx,

AVFrame * picture,

int * got_picture_ptr,

const AVPacket * avpkt 

)

[링크 : https://www.ffmpeg.org/doxygen/3.2/group__lavc__decoding.html#ga3ac51525b7ad8bca4ced9f3446e96532]

int avcodec_receive_frame ( AVCodecContext * avctx,

AVFrame * frame 

)

[링크 : https://www.ffmpeg.org/doxygen/3.2/group__lavc__decoding.html#ga11e6542c4e66d3028668788a1a74217c]

+

2017.03.06

avcodec_register_all();

av_register_all();

avformat_network_init();

[링크 : http://laconicd.blogspot.com/2014/01/ffmpeg.html]

[링크 : http://egloos.zum.com/aslike/v/3083403]

+

2017.03.08

[링크 : https://www.codeproject.com/Tips/111468/FFmpeg-Tutorial]

[링크 : http://dranger.com/ffmpeg/tutorial01.html]

[링크 : https://ffmpeg.org/doxygen/trunk/doc_2examples_2decoding_encoding_8c-example.html]