How to convert RGB to NV12

See more:

Mobile

WinCE

image-conversion

Below is the code for converting NV12 to RGB.
What i want is conversion from RGB to NV12.

void CFramePump::NV12ToRGB( BYTE* pOut, BYTE* pIn,unsigned int Width, unsigned int Height)
{


HRESULT hr = S_OK;
DWORD dexOut = 0;

unsigned int PX,PY;

int y[4];
int u;
int v;


int rbg_off;

int y_off = 0;
int v_off=Height*Width;
unsigned int rgb;
rbg_off = 0;
int ppy =0;
int ppx =0;
int off;

for (PY=0;PY<Height;PY+=2)
{

for (PX=0;PX<Width;PX+=2)
{

// getting the YUV values
y_off =PY*Width+PX;

y[0] = pIn[y_off];
y[1] = pIn[y_off+1];
y[2] = pIn[y_off+Width];
y[3] = pIn[y_off+Width+1];


u = pIn[v_off++];

v = pIn[v_off++];

off = (PY*Width*3)+(PX*3);

rgb = yuv2rgb(y[0], u, v);
pOut[off] = (rgb & 0x000000ff);
pOut[off+1] = (rgb & 0x0000ff00) >> 8;
pOut[off+2] = (rgb & 0x00ff0000) >> 16;


rgb = yuv2rgb( y[1],u,v);
pOut[off+3] = (rgb & 0x000000ff);
pOut[off+4] = (rgb & 0x0000ff00) >> 8;
pOut[off+5] = (rgb & 0x00ff0000) >> 16;

off+=(Width*3);

rgb = yuv2rgb( y[2],u,v);
pOut[off] = (rgb & 0x000000ff);
pOut[off+1] = (rgb & 0x0000ff00) >> 8;
pOut[off+2] = (rgb & 0x00ff0000) >> 16;

rgb = yuv2rgb( y[3],u,v);
pOut[off+3] = (rgb & 0x000000ff);
pOut[off+4] = (rgb & 0x0000ff00) >> 8;
pOut[off+5] = (rgb & 0x00ff0000) >> 16;


}

}

}

unsigned int yuv2rgb( int Y, int Cr ,int Cb )
{
int Ey, Epb, Epr;
int Eg, Eb, Er;
unsigned int result;

Ey = (Y-16);
Epb = (Cb-128);
Epr = (Cr-128);

Eg = (298*Ey - 100*Epb - 208*Epr)/256;
Eb = (298*Ey + 516*Epb)/256;
Er = (298*Ey + 408*Epr)/256;

if(Eg > 255)
Eg = 255;
if(Eg < 0)
Eg = 0;

if(Eb > 255)
Eb = 255;
if(Eb < 0)
Eb = 0;

if(Er > 255)
Er = 255;
if(Er < 0)
Er = 0;

result = (Eb << 16) | (Eg << 8) | Er;

return result;
}

What I have tried:

Conversion from NV12 to RGB.
I want RGB to NV12 conversion routine.