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1、gitclonegit://source.ffmpeg.org/ffmpeg.gitffmpeg
2、./configure --prefix=./out
make && make install
3、test.cpp
编译：g++ test.cpp -o test-I./ffmpeg/out/include -L./ffmpeg/out/lib -lavformat -lavcodec -lavdevice -lavfilter -lswscale -lswresample -lavutil -lpthread
#include <stdio.h>
#include<stdlib.h>
#include<time.h>
#include <string.h>
#include <malloc.h>
//Linux...
#ifdef __cplusplus
extern "C"
{
#endif
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavutil/pixfmt.h>
#include <libavutil/opt.h>
#include <libavutil/imgutils.h>
//#include <SDL2/SDL.h>
#ifdef __cplusplus
};
#endif
int main(int argc, char **argv){
av_register_all();
const int width = 1920, height = 1080;
enum AVPixelFormat src_pix_fmt = AV_PIX_FMT_NV12, dst_pix_fmt = AV_PIX_FMT_BGR24;
FILE* fp = NULL;
fp = fopen("frame-0008.yuv", "rb");
uint8_t* yuvbuf = (uint8_t*)malloc(width * height * 3/2);
fread(yuvbuf, 1,width * height * 3/2, fp);
fclose(fp);
AVFrame *pFrameRGB = av_frame_alloc();
uint8_t *out_buffer = new uint8_t[avpicture_get_size(dst_pix_fmt, width, height)];
//avpicture_fill是给pFrameYUV初始化一些字段，并且给填充data和linesize
avpicture_fill((AVPicture *)pFrameRGB, out_buffer, dst_pix_fmt, width, height);
AVFrame *yuvFrame = av_frame_alloc();
avpicture_fill((AVPicture *)yuvFrame, yuvbuf, src_pix_fmt, width, height);
SwsContext *sws_ctx = sws_getContext(
width, height, src_pix_fmt,
width, height, dst_pix_fmt,
SWS_BILINEAR, NULL, NULL, NULL);
/*
int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[],
const int srcStride[], int srcSliceY, int srcSliceH,
uint8_t *const dst[], const int dstStride[]);
srcSlice[],dst[]是输入输出图像数据各颜色通道的buffer指针数组
srcStride[]，dstStride[] 为输入输出图像数据各颜色通道每行存储的字节数数组
srcSliceY 为从输入图像数据的第多少列开始逐行扫描，通常设为0
srcSliceH 为需要扫描多少行，通常为输入图像数据的高度
*/
// *(rgbFrame->linesize)--->3*width
// *(pFrameYUV->linesize)-->width
sws_scale(sws_ctx, yuvFrame->data, yuvFrame->linesize, 0, height, pFrameRGB->data, pFrameRGB->linesize);
sws_freeContext(sws_ctx);
FILE* fpout = NULL;
fpout = fopen( "1920x1080.rgb", "wb");
fwrite(pFrameRGB->data[0], 1, width * height * 3, fpout);
fclose(fpout);
delete out_buffer;
free(yuvbuf);
av_frame_free(&pFrameRGB);
av_frame_free(&yuvFrame);
return 0;
}
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