yuv420平面格式转换为rgb24(带跨度,ddraw输出)

刘旭 — Wed, 24 Oct 2007 15:02:00 GMT

void yuv420_to_rgb24(unsigned char *pdata, int stride, int width, int height, unsigned char *pdst)
{
const unsigned char *Y, *U, *V;
unsigned char *RGB;
int x, y;

if (stride < 0) {
  Y = pdata - stride * (height - 1);
  U = pdata - (stride / 2) * (height * 5 / 2 - 1);
  V = pdata - (stride / 2) * (height * 3 - 1);
} else {
  Y = pdata;
  U = pdata + stride * height;
  V = pdata + stride * height * 5 / 4;
}
RGB = pdst;
for(y=0; y {
  unsigned char *pDst1 = RGB;
  unsigned char *pDst2 = RGB+width*3;
  const unsigned char *pYSrc1 = Y;
  const unsigned char *pYSrc2 = Y + stride;
  for(x=0; x  {
   const int Uo = U[x]-128;
   const int Vo = V[x]-128;
   const int Ro = (91181*Uo)>>16;
   const int Go = (22553*Vo + 46801*Uo)>>16;
   const int Bo = (116129*Vo)>>16;

   TO_RGB24(pDst1,   pYSrc1)
    pDst1 +=6;
   pYSrc1+=2;
   TO_RGB24(pDst2,   pYSrc2)
    pDst2 +=6;
   pYSrc2+=2;
  }
  RGB += width*6;
  Y    += 2*stride;
  U    += stride/2;
  V    += stride/2;
}
}

刘旭 2007-10-24 23:02 发表评论

RGB24到YUV420平面格式

刘旭 — Wed, 24 Oct 2007 14:58:00 GMT

#define SCALEBITS            8
#define ONE_HALF             (1 << (SCALEBITS - 1))
#define FIX(x)               ((int) ((x) * (1L<typedef unsigned char        uint8_t;
void rgb24_to_yuv420p(uint8_t *lum, uint8_t *cb, uint8_t *cr, uint8_t *src, int width, int height)
{
    int wrap, wrap3, x, y;
    int r, g, b, r1, g1, b1;
    uint8_t *p;
    wrap = width;
    wrap3 = width * 3;
    p = src;
    for (y = 0; y < height; y += 2)
{
        for (x = 0; x < width; x += 2)
  {
            r = p[0];
            g = p[1];
            b = p[2];
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            r = p[3];
            g = p[4];
            b = p[5];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            p += wrap3;
            lum += wrap;
            r = p[0];
            g = p[1];
            b = p[2];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
            r = p[3];
            g = p[4];
            b = p[5];
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

            cb[0] = (((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
    FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128);
            cr[0] = (((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
    FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128);
            cb++;
            cr++;
            p += -wrap3+2 * 3;
            lum += -wrap + 2;
        }
        p += wrap3;
        lum += wrap;
    }
}

刘旭 2007-10-24 22:58 发表评论

C++博客-x-zone-文章分类-RGB&&YUV

yuv420平面格式转换为rgb24(带跨度,ddraw输出)

RGB24到YUV420平面格式