使用libyuv与ffmpeg实现yuv_rgb格式转换性能分析

两组对比：同样分辨率的文件，通过所消耗的时长判断
1：YUV to RGB
2：YUV 尺寸缩放

结果：（文件有84帧图像） 则每帧耗时如下
libyuv_I420_to_Rgb 623066
ffmpeg_I420_to_Rgb 1815963

libyuv_swscale 996027
ffmpeg_swscale 1387750

可以看出libyuv要更好一点，yuv_to_rgb转换时大概为3倍, 缩放大概为一倍多

#include <stdio.h>
#include <windows.h>extern "C"
{
#include "libswscale/swscale.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
};#include "libyuv.h"static inline uint64_t get_clockfreq(void)
{static LARGE_INTEGER clock_freq;QueryPerformanceFrequency(&clock_freq);return clock_freq.QuadPart;
}uint64_t os_gettime_ns(void)
{LARGE_INTEGER current_time;double time_val;QueryPerformanceCounter(&current_time);time_val = (double)current_time.QuadPart;time_val *= 1000000000.0;time_val /= (double)get_clockfreq();return (uint64_t)time_val;
}int libyuv_I420_to_Rgb()
{   const int width = 1280, height = 720;FILE *src_file = fopen("1280x720.yuv", "rb");FILE *dst_file = fopen("1280x720.rgb", "wb");int size_src = width * height * 3 / 2;int size_dest = width * height * 4;char *buffer_src = (char *)malloc(size_src);char *buffer_dest = (char *)malloc(size_dest);uint64_t start_time = os_gettime_ns();while (1){if (fread(buffer_src, 1, size_src, src_file) != size_src){//fseek(src_file, 0, 0);//fread(buffer_src, 1, size_src, src_file);break;}//libyuv::I420ToARGB(const uint8* src_y, int src_stride_y,//  const uint8* src_u, int src_stride_u,//  const uint8* src_v, int src_stride_v,//  uint8* dst_argb, int dst_stride_argb,//  int width, int height);libyuv::I420ToARGB((const uint8*)buffer_src, width,(const uint8*)(buffer_src + width * height), width / 2,(const uint8*)(buffer_src + width * height * 5 / 4), width / 2,(uint8*)buffer_dest, width * 4,width, height);//fwrite(buffer_dest, 1, size_dest, dst_file);}uint64_t stop_time = os_gettime_ns();printf("------ %ld \n", stop_time - start_time);free(buffer_src);free(buffer_dest);fclose(dst_file);fclose(src_file);return 0;
}int ffmpeg_I420_to_Rgb()
{const int width = 1280, height = 720;FILE *src_file = fopen("1280x720.yuv", "rb");FILE *dst_file = fopen("1280x720.rgb", "wb");uint8_t *src_data[4];int src_linesize[4];uint8_t *dst_data[4];int dst_linesize[4];struct SwsContext *img_convert_ctx;int size_src = width * height * 3 / 2;char *buffer_src = (char *)malloc(size_src);if (av_image_alloc(src_data, src_linesize, width, height, AV_PIX_FMT_YUV420P, 1) < 0){return -1;}if (av_image_alloc(dst_data, dst_linesize, width, height, AV_PIX_FMT_BGRA, 1) < 0) {return -1;}img_convert_ctx = sws_alloc_context();av_opt_show2(img_convert_ctx, stdout, AV_OPT_FLAG_VIDEO_PARAM, NULL);av_opt_set_int(img_convert_ctx, "sws_flags", SWS_FAST_BILINEAR | SWS_PRINT_INFO, NULL);av_opt_set_int(img_convert_ctx, "srcw", width, NULL);av_opt_set_int(img_convert_ctx, "srch", height, NULL);av_opt_set_int(img_convert_ctx, "src_format", AV_PIX_FMT_YUV420P, NULL);av_opt_set_int(img_convert_ctx, "src_range", 1, NULL);av_opt_set_int(img_convert_ctx, "dstw", width, NULL);av_opt_set_int(img_convert_ctx, "dsth", height, NULL);av_opt_set_int(img_convert_ctx, "dst_format", AV_PIX_FMT_BGRA, NULL);av_opt_set_int(img_convert_ctx, "dst_range", 1, NULL);sws_init_context(img_convert_ctx, NULL, NULL);uint64_t start_time = os_gettime_ns();while (1){if (fread(buffer_src, 1, size_src, src_file) != size_src){//fseek(src_file, 0, 0);//fread(buffer_src, 1, size_src, src_file);break;}memcpy(src_data[0], buffer_src, width * height);                    //Ymemcpy(src_data[1], buffer_src + width * height, width * height / 4);      //Umemcpy(src_data[2], buffer_src + width * height * 5 / 4, width * height / 4);  //Vsws_scale(img_convert_ctx, src_data, src_linesize, 0, height, dst_data, dst_linesize);//fwrite(dst_data[0], 1, width * height * 4, dst_file);}uint64_t stop_time = os_gettime_ns();printf("------ %ld\n", stop_time - start_time);sws_freeContext(img_convert_ctx);free(buffer_src);fclose(src_file);fclose(dst_file);av_freep(&src_data[0]);av_freep(&dst_data[0]);return 0;
}int libyuv_swscale()
{const int width_src = 1280, height_src = 720;const int width_dest = 640, height_dest = 320;FILE *src_file = fopen("1280x720.yuv", "rb");FILE *dst_file = fopen("640x320.yuv", "wb");int size_src = width_src * height_src * 3 / 2;int size_dest = width_dest * height_dest * 3 / 2;char *buffer_src = (char *)malloc(size_src);char *buffer_dest = (char *)malloc(size_dest);uint64_t start_time = os_gettime_ns();while (1){if (fread(buffer_src, 1, size_src, src_file) != size_src){//fseek(src_file, 0, 0);//fread(buffer_src, 1, size_src, src_file);break;}//int I420Scale(const uint8* src_y, int src_stride_y,//  const uint8* src_u, int src_stride_u,//  const uint8* src_v, int src_stride_v,//  int src_width, int src_height,//  uint8* dst_y, int dst_stride_y,//  uint8* dst_u, int dst_stride_u,//  uint8* dst_v, int dst_stride_v,//  int dst_width, int dst_height,//enum FilterMode filtering);libyuv::I420Scale((const uint8*)buffer_src, width_src,(const uint8*)(buffer_src + width_src * height_src), width_src / 2,(const uint8*)(buffer_src + width_src * height_src * 5 / 4), width_src / 2,width_src, height_src,(uint8*)buffer_dest, width_dest,(uint8*)(buffer_dest + width_dest * height_dest), width_dest / 2,(uint8*)(buffer_dest + width_dest * height_dest * 5 / 4), width_dest / 2,width_dest, height_dest,libyuv::kFilterNone);//fwrite(buffer_dest, 1, size_dest, dst_file);}uint64_t stop_time = os_gettime_ns();printf("------ %ld\n", stop_time - start_time);free(buffer_src);free(buffer_dest);fclose(dst_file);fclose(src_file);return 0;return 0;
}int ffmpeg_swscale()
{const int width_src = 1280, height_src = 720;const int width_dest = 640, height_dest = 320;FILE *src_file = fopen("1280x720.yuv", "rb");FILE *dst_file = fopen("640x320.yuv", "wb");uint8_t *src_data[4];int src_linesize[4];uint8_t *dst_data[4];int dst_linesize[4];struct SwsContext *img_convert_ctx;int size_src = width_src * height_src * 3 / 2;char *buffer_src = (char *)malloc(size_src);if (av_image_alloc(src_data, src_linesize, width_src, height_src, AV_PIX_FMT_YUV420P, 1) < 0){return -1;}if (av_image_alloc(dst_data, dst_linesize, width_dest, height_dest, AV_PIX_FMT_YUV420P, 1) < 0) {return -1;}img_convert_ctx = sws_alloc_context();av_opt_show2(img_convert_ctx, stdout, AV_OPT_FLAG_VIDEO_PARAM, NULL);av_opt_set_int(img_convert_ctx, "sws_flags", SWS_FAST_BILINEAR | SWS_PRINT_INFO, NULL);av_opt_set_int(img_convert_ctx, "srcw", width_src, NULL);av_opt_set_int(img_convert_ctx, "srch", height_src, NULL);av_opt_set_int(img_convert_ctx, "src_format", AV_PIX_FMT_YUV420P, NULL);av_opt_set_int(img_convert_ctx, "src_range", 1, NULL);av_opt_set_int(img_convert_ctx, "dstw", width_dest, NULL);av_opt_set_int(img_convert_ctx, "dsth", height_dest, NULL);av_opt_set_int(img_convert_ctx, "dst_format", AV_PIX_FMT_YUV420P, NULL);av_opt_set_int(img_convert_ctx, "dst_range", 1, NULL);sws_init_context(img_convert_ctx, NULL, NULL);uint64_t start_time = os_gettime_ns();while (1){if (fread(buffer_src, 1, size_src, src_file) != size_src){//fseek(src_file, 0, 0);//fread(buffer_src, 1, size_src, src_file);break;}memcpy(src_data[0], buffer_src, width_src * height_src);                    //Ymemcpy(src_data[1], buffer_src + width_src * height_src, width_src * height_src / 4);      //Umemcpy(src_data[2], buffer_src + width_src * height_src * 5 / 4, width_src * height_src / 4);  //Vsws_scale(img_convert_ctx, src_data, src_linesize, 0, height_src, dst_data, dst_linesize);//fwrite(dst_data[0], 1, width_dest * height_dest, dst_file);//fwrite(dst_data[1], 1, width_dest * height_dest / 4, dst_file);//fwrite(dst_data[2], 1, width_dest * height_dest / 4, dst_file);}uint64_t stop_time = os_gettime_ns();printf("------ %ld\n", stop_time - start_time);sws_freeContext(img_convert_ctx);free(buffer_src);fclose(src_file);fclose(dst_file);av_freep(&src_data[0]);av_freep(&dst_data[0]);return 0;
}int main(int argc, char* argv[])
{libyuv_I420_to_Rgb();//ffmpeg_I420_to_Rgb();//libyuv_swscale();//ffmpeg_swscale();getchar();return 0;
}