YUY2(YUV) 与 RGB 格式说明及转换程序

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谈谈RGB、YUY2、YUYV、YVYU、UYVY、AYUV：http://www.chinavideo.org/viewthread.php?tid=4143

RGB、YUY2、YUYV、YVYU、UYVY、AYUV格式详解： http://www.360doc.com/content/10/0322/15/514342_19794109.shtml

YUY2(YUV) 与 RGB 格式图片的相互转换以及基于YUY2(YUV)的blending： http://blog.csdn.net/jtujtujtu/archive/2009/02/10/3874621.aspx

程序示例：

#include <stdio.h>#include <stdlib.h>int convert_rgb_to_yuv_pixel(int r, int g, int b){ unsigned int pixel32 = 0; unsigned char *pixel = (unsigned char *)&pixel32; int y, u, v; y =   0.299 * (r - 128) + 0.587 * (g - 128) + 0.114 * (b - 128) + 128; u = - 0.147 * (r - 128) - 0.289 * (g - 128) + 0.436 * (b - 128) + 128; v =   0.615 * (r - 128) - 0.515 * (g - 128) - 0.100 * (b - 128) + 128; if(y > 255) y = 255; if(u > 255) u = 255; if(v > 255) v = 255; if(y < 0) y = 0; if(u < 0) u = 0; if(v < 0) v = 0; pixel[0] = y; pixel[1] = u; pixel[2] = v; return pixel32;}int convert_rgb_to_yuv_buffer(unsigned char *rgb, unsigned char *yuv, unsigned int width, unsigned int height){ unsigned int in, out = 0; unsigned int pixel32; int y0, u0, v0, y1, u1, v1; for(in = 0; in < width * height * 3; in += 6) {  pixel32 = convert_rgb_to_yuv_pixel(rgb[in], rgb[in + 1], rgb[in + 2]);  y0 = (pixel32 & 0x000000ff);  u0 = (pixel32 & 0x0000ff00) >>  8;  v0 = (pixel32 & 0x00ff0000) >> 16;  pixel32 = convert_rgb_to_yuv_pixel(rgb[in + 3], rgb[in + 4], rgb[in + 5]);  y1 = (pixel32 & 0x000000ff);  u1 = (pixel32 & 0x0000ff00) >>  8;  v1 = (pixel32 & 0x00ff0000) >> 16;  yuv[out++] = y0;  yuv[out++] = (u0 + u1) / 2;  yuv[out++] = y1;  yuv[out++] = (v0 + v1) / 2; } return 0;}int convert_rgb_to_yuv_file(char *rgbfile, char *yuvfile, unsigned int width, unsigned int height){ FILE *in, *out; unsigned char *yuv, *rgb; in = fopen(rgbfile, "rb"); if(!in)  return 1; out = fopen(yuvfile, "wb"); if(!out)  return 1; rgb = malloc(width * height * 3); if(rgb == NULL)  return 2; yuv = malloc(width * height * 2); if(yuv == NULL)  return 2; fread(rgb, width * height * 3, 1, in); fclose(in); if(convert_rgb_to_yuv_buffer(rgb, yuv, width, height))  return 3; fwrite(yuv, width * height * 2, 1, out); fclose(out); return 0;}int convert_yuv_to_rgb_pixel(int y, int u, int v){ unsigned int pixel32 = 0; unsigned char *pixel = (unsigned char *)&pixel32; int r, g, b; r = y + (1.370705 * (v-128)); g = y - (0.698001 * (v-128)) - (0.337633 * (u-128)); b = y + (1.732446 * (u-128)); if(r > 255) r = 255; if(g > 255) g = 255; if(b > 255) b = 255; if(r < 0) r = 0; if(g < 0) g = 0; if(b < 0) b = 0; pixel[0] = r * 220 / 256; pixel[1] = g * 220 / 256; pixel[2] = b * 220 / 256; return pixel32;}int convert_yuv_to_rgb_buffer(unsigned char *yuv, unsigned char *rgb, unsigned int width, unsigned int height){ unsigned int in, out = 0; unsigned int pixel_16; unsigned char pixel_24[3]; unsigned int pixel32; int y0, u, y1, v; for(in = 0; in < width * height * 2; in += 4) {  pixel_16 =   yuv[in + 3] << 24 |   yuv[in + 2] << 16 |   yuv[in + 1] <<  8 |   yuv[in + 0];  y0 = (pixel_16 & 0x000000ff);  u  = (pixel_16 & 0x0000ff00) >>  8;  y1 = (pixel_16 & 0x00ff0000) >> 16;  v  = (pixel_16 & 0xff000000) >> 24;  pixel32 = convert_yuv_to_rgb_pixel(y0, u, v);  pixel_24[0] = (pixel32 & 0x000000ff);  pixel_24[1] = (pixel32 & 0x0000ff00) >> 8;  pixel_24[2] = (pixel32 & 0x00ff0000) >> 16;  rgb[out++] = pixel_24[0];  rgb[out++] = pixel_24[1];  rgb[out++] = pixel_24[2];  pixel32 = convert_yuv_to_rgb_pixel(y1, u, v);  pixel_24[0] = (pixel32 & 0x000000ff);  pixel_24[1] = (pixel32 & 0x0000ff00) >> 8;  pixel_24[2] = (pixel32 & 0x00ff0000) >> 16;  rgb[out++] = pixel_24[0];  rgb[out++] = pixel_24[1];  rgb[out++] = pixel_24[2]; } return 0;}int convert_yuv_to_rgb_file(char *yuvfile, char *rgbfile, unsigned int width, unsigned int height){ FILE *in, *out; unsigned char *yuv, *rgb; in = fopen(yuvfile, "rb"); if(!in)  return 1; out = fopen(rgbfile, "wb"); if(!out)  return 1; yuv = malloc(width * height * 2); if(yuv == NULL)  return 2; rgb = malloc(width * height * 3); if(rgb == NULL)  return 2; fread(yuv, width * height * 2, 1, in); fclose(in); if(convert_yuv_to_rgb_buffer(yuv, rgb, width, height))  return 3; fwrite(rgb, width * height * 3, 1, out); fclose(out); return 0;}int main(int argc, char **argv){ int ret = 0; char *infile, *outfile; unsigned int width, height; if(argc < 5) {#ifdef RGB2YUV  fprintf(stderr, "Convert RGB images to YUY2 (YUYV)./n/n");#else  fprintf(stderr, "Convert YUY2 (YUYV) images to RGB./n/n");#endif  fprintf(stderr, "Syntax: %s width height input output/n", argv[0]);  return 1; } width = atoi(argv[1]); height = atoi(argv[2]); infile = argv[3]; outfile = argv[4];#ifdef RGB2YUV printf("RGB2YUY: %s => %s/n", infile, outfile); ret = convert_rgb_to_yuv_file(infile, outfile, width, height);#else printf("YUV2RGB: %s => %s/n", infile, outfile); ret = convert_yuv_to_rgb_file(infile, outfile, width, height);#endif if(ret == 0) {  printf("Done./n"); } else {  printf("Failed (error = %d). Aborting./n", ret);  return 1; } return 0;}