YUYV 轉 RGB 的 C code

YUYV(YUV422) to RGB

YUYV to RGB

void yuyv_to_rgb(unsigned char* yuv,unsigned char* rgb, int image_width, int image_height)
{
    unsigned int i;
    unsigned char* y0 = yuv + 0;   
    unsigned char* u0 = yuv + 1;
    unsigned char* y1 = yuv + 2;
    unsigned char* v0 = yuv + 3;
 
    unsigned  char* r0 = rgb + 0;
    unsigned  char* g0 = rgb + 1;
    unsigned  char* b0 = rgb + 2;
    unsigned  char* r1 = rgb + 3;
    unsigned  char* g1 = rgb + 4;
    unsigned  char* b1 = rgb + 5;

    float rt0 = 0, gt0 = 0, bt0 = 0, rt1 = 0, gt1 = 0, bt1 = 0;
 
    for(i = 0; i <= (image_width * image_height) / 2 ;i++)
    {
        bt0 = 1.164 * (*y0 - 16) + 2.018 * (*u0 - 128); 
        gt0 = 1.164 * (*y0 - 16) - 0.813 * (*v0 - 128) - 0.394 * (*u0 - 128); 
        rt0 = 1.164 * (*y0 - 16) + 1.596 * (*v0 - 128); 
   
        bt1 = 1.164 * (*y1 - 16) + 2.018 * (*u0 - 128); 
        gt1 = 1.164 * (*y1 - 16) - 0.813 * (*v0 - 128) - 0.394 * (*u0 - 128); 
        rt1 = 1.164 * (*y1 - 16) + 1.596 * (*v0 - 128); 
      
        if(rt0 > 250)   rt0 = 255;
        if(rt0 < 0)     rt0 = 0; 
 
        if(gt0 > 250)  gt0 = 255;
        if(gt0 < 0) gt0 = 0; 
 
        if(bt0 > 250) bt0 = 255;
        if(bt0 < 0) bt0 = 0; 
 
        if(rt1 > 250) rt1 = 255;
        if(rt1 < 0) rt1 = 0; 
 
        if(gt1 > 250) gt1 = 255;
        if(gt1 < 0) gt1 = 0; 
 
        if(bt1 > 250) bt1 = 255;
        if(bt1 < 0) bt1 = 0; 
     
        *r0 = (unsigned char)rt0;
        *g0 = (unsigned char)gt0;
        *b0 = (unsigned char)bt0;
 
        *r1 = (unsigned char)rt1;
        *g1 = (unsigned char)gt1;
        *b1 = (unsigned char)bt1;
 
        yuv = yuv + 4;
        rgb = rgb + 6;
        if(yuv == NULL)
          break;
 
        y0 = yuv;
        u0 = yuv + 1;
        y1 = yuv + 2;
        v0 = yuv + 3;
  
        r0 = rgb + 0;
        g0 = rgb + 1;
        b0 = rgb + 2;
        r1 = rgb + 3;
        g1 = rgb + 4;
        b1 = rgb + 5;
    }   
}

usage

int image_width = 1920;
int image_height = 1080;
unsigned char * p_yuyv_data = (unsigned char *)malloc(sizeof(unsigned char) * image_width * image_height * 2);
unsigned char * p_rgb_data = (unsigned char *)malloc(sizeof(unsigned char) * image_width * image_height * 3);

// yuyv の処理
// ... 省略

yuyv_to_rgb(p_yuyv_data, p_rgb_data);

// rgb の処理
// ... 省略
free(p_yuyv_data);
free(p_rgb_data);