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 RGB2YUVfprintf(stderr, "Convert RGB images to YUY2 (YUYV)./n/n");
#elsefprintf(stderr, "Convert YUY2 (YUYV) images to RGB./n/n");
#endiffprintf(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 RGB2YUVprintf("RGB2YUY: %s => %s/n", infile, outfile);ret = convert_rgb_to_yuv_file(infile, outfile, width, height);
#elseprintf("YUV2RGB: %s => %s/n", infile, outfile);ret = convert_yuv_to_rgb_file(infile, outfile, width, height);
#endifif(ret == 0) {printf("Done./n");} else {printf("Failed (error = %d). Aborting./n", ret);return 1;}return 0;
}
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