原创 YUYV 转换成RGB24代码

 2010-5-8 19:04  7640 2 2 分类: MCU/ 嵌入式

//makefile

CFLAGS := -W -Wall
LDFLAGS :=

all: yuv2rgb rgb2yuv

yuv2rgb.o : main.c
gcc $(CFLAGS) -c -o $@ $<

rgb2yuv.o : main.c
gcc $(CFLAGS) -DRGB2YUV -c -o $@ $<

yuv2rgb: yuv2rgb.o
gcc $(LDFLAGS) -o $@ $^

rgb2yuv: rgb2yuv.o
gcc $(LDFLAGS) -o $@ $^

clean:
-rm -f *.o
-rm -f yuv2rgb rgb2yuv

/*
* Convert between YUY2 (YUYV) and RGB.
*
* Copyright 2007 (c) Logitech. All Rights Reserved.
*
* This code and information is provided "as is" without warranty of
* any kind, either expressed or implied, including but not limited to
* the implied warranties of merchantability and/or fitness for a
* particular purpose.
*/

#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;
}

上面代码为网络参考代码.转http://linfengdu.blog.163.com/blog/static/11771073201032802654678/

在嵌入式 linux中通过V4L2打摄像头

void MainWindow::paintEvent ( QPaintEvent * event )
{

     QPainter Painter(this) ;
     read_frame();
     convert_yuv_to_rgb_buffer((unsigned char *)buffers[JPEGindex].start,bufrgb,320,240);
     QImage img(bufrgb,320,240,QImage::Format_RGB888);
     Painter.drawImage(0,0,img) ;

     update();
}

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