YUY2 to RGB24 conversion

#define FIXNUM 16
#define FIX(a, b) ((int)((a)*(1<<(b))))
#define UNFIX(a, b) ((a+(1<<(b-1)))>>(b))

// Approximate 255 by 256
#define ICCIRUV(x) (((x)<<8)/224)
#define ICCIRY(x) ((((x)-16)<<8)/219)

// Clip out-range values

#define CLIP(t) (((t)>255)?255:(((t)<0)?0:(t)))

#define GET_R_FROM_YUV(y, u, v) UNFIX((FIX(1.0, FIXNUM)*(y) + FIX(1.402, FIXNUM)*(v)), FIXNUM)

#define GET_G_FROM_YUV(y, u, v) UNFIX((FIX(1.0, FIXNUM)*(y) + FIX(-0.344, FIXNUM)*(u) + FIX(-0.714, FIXNUM)*(v)), FIXNUM)

#define GET_B_FROM_YUV(y, u, v) UNFIX((FIX(1.0, FIXNUM)*(y) + FIX(1.772, FIXNUM)*(u)), FIXNUM)

#define GET_Y_FROM_RGB(r, g, b) UNFIX((FIX(0.299, FIXNUM)*(r) + FIX(0.587, FIXNUM)*(g) + FIX(0.114, FIXNUM)*(b)), FIXNUM)

#define GET_U_FROM_RGB(r, g, b) UNFIX((FIX(-0.169, FIXNUM)*(r) + FIX(-0.331, FIXNUM)*(g) + FIX(0.500, FIXNUM)*(b)), FIXNUM)

#define GET_V_FROM_RGB(r, g, b) UNFIX((FIX(0.500, FIXNUM)*(r) + FIX(-0.419, FIXNUM)*(g) + FIX(-0.081, FIXNUM)*(b)), FIXNUM)



bool CYUVToRGB::YUV422P_to_RGB24V2(int width, int height, unsigned char *s,unsigned char *d)
{
int i;
unsigned char *p_dest;
unsigned char y1, u, y2, v;
int Y1, Y2, U, V;
unsigned char r, g, b;

p_dest = d;

int size = height * (width / 2);
unsigned long srcIndex = 0;
unsigned long dstIndex = 0;

try
{

for(i = 0 ; i < size ; i++)
{

y1 = s[srcIndex];
u = s[srcIndex+ 1];
y2 = s[srcIndex+ 2];
v = s[srcIndex+ 3];

Y1 = ICCIRY(y1);
U = ICCIRUV(u - 128);
Y2 = ICCIRY(y2);
V = ICCIRUV(v - 128);



r = CLIP(GET_R_FROM_YUV(Y1, U, V));
g = CLIP(GET_G_FROM_YUV(Y1, U, V));
b = CLIP(GET_B_FROM_YUV(Y1, U, V));


p_dest[dstIndex] = b;
p_dest[dstIndex + 1] = g;
p_dest[dstIndex + 2] = r;




dstIndex += 3;

r = CLIP(GET_R_FROM_YUV(Y2, U, V));
g = CLIP(GET_G_FROM_YUV(Y2, U, V));
b = CLIP(GET_B_FROM_YUV(Y2, U, V));

p_dest[dstIndex] = b;
p_dest[dstIndex + 1] = g;
p_dest[dstIndex + 2] = r;

dstIndex += 3;

srcIndex += 4;
}

return true;
}
catch(...)
{
OutputDebugString("\n YUV422P to RGB24V2 Failed");
return false;
}

}