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;
}

}

GraphBuilder way to convert RGB to YUY2

u need the RGB to YUY2 conversion as source Filter ?

we can do RGB to YUY2 in another way also .

Build the graph with Source Filter and add the color conversion filter to it.
and render it in screen.

Note : we have to set the input and output pin of the color conversion filter as
YUY2 .

RGB to YUY2 conversion

RGB to YUY2 :
1.Convert the RGB to YUY2 in my way and store it in a file
2.Using Color space converter convert it to YUY2 and dump it in memory

Compare these two things...

Other way is to

1.Initialize DirectDraw
2.Create the RGB Surface and copy the data to RGB surface
3.Create the YUY2 Surface and copy the RGB Surface to the YUY2 Surface
4.Lock the YUY2 Surface and get the buffer data...

RGB to YUV :

RGB to YUV conversion some formulas are available...
Bytes are arranged in this manner for YUY2
For the First 3 RGB Bytes we have to find the YU
YU
For the next 3 RGB bytes, we have to find the YV.
YV
This will be continued repeatedly.
YUYVYUYV