YUV and RGB conversion in various formats

This article from http://blog.csdn.net/hardVB/archive/2007/10/18/1831810.aspx

 

/Yuy2 video conversion RGB format by hard 2007-10-17
// Http://www.fourcc.org/fccyvrgb.php
Inline void yuy2_rgb (byte * yuy2buff, byte * rgbbuff, DWORD dwsize)
{

// B = 1.164 (Y-16) + 2.018 (u-128)
// G = 1.164 (Y-16)-0.813 (V-128)-0.391 (u-128)
// R = 1.164 (Y-16) + 1.596 (V-128)
Byte * orgrgbbuff = rgbbuff;
For (dword count = 0; count <dwsize; count + = 4)
{
// Y0 U0 Y1 V0
Float Y0 = * yuy2buff;
Float u = * (++ yuy2buff );
Float Y1 = * (++ yuy2buff );
Float v = * (++ yuy2buff );
++ Yuy2buff;

* (Rgbbuff) = (byte) (y0 + (1.370705*(V-128 )));
* (++ Rgbbuff) = (byte) (y0-(0.698001*(V-128)-(0.337633*(U-128 )));
* (++ Rgbbuff) = (byte) (y0 + (1.732446*(U-128 )));

* (++ Rgbbuff) = (byte) (Y1 + (1.370705*(V-128 )));
* (++ Rgbbuff) = (byte) (Y1-(0.698001*(V-128)-(0.337633*(U-128 )));
* (++ Rgbbuff) = (byte) (Y1 + (1.732446*(U-128 )));
++ Rgbbuff;
}
}
Inline void yuy2_rgb2 (byte * yuy2buff, byte * rgbbuff, DWORD dwsize)
{

/// R = Y + 1.14 V
// G = Y-0.39u-0.58 V
// B = Y + 2.03u

// R = Y + 1.403v'
// G = Y-0.344u '-0.714v'
// B = Y + 1.770u'
Byte * orgrgbbuff = rgbbuff;
For (dword count = 0; count <dwsize; count + = 4)
{
// Y0 U0 Y1 V0
Float Y0 = * yuy2buff;
Float u = * (++ yuy2buff );
Float Y1 = * (++ yuy2buff );
Float v = * (++ yuy2buff );
++ Yuy2buff;

Float R, G, B;

R = (y0 + 1.14f * V );
G = (y0-0.39f * U-0.58f * V );
B = (y0 + 2.03f * U );
If (r <0) r = 0;
If (r> 255) r = 255;
If (G <0) G = 0;
If (G> 255) G = 255;
If (B <0) B = 0;
If (B> 255) B = 255;

* (Rgbbuff) = (byte) B;
* (++ Rgbbuff) = (byte) g;
* (++ Rgbbuff) = (byte) R;

R = (Y1 + 1.14f * V );
G = (Y1-0.39f * U-0.58f * V );
B = (Y1 + 2.03f * U );
If (r <0) r = 0;
If (r> 255) r = 255;
If (G <0) G = 0;
If (G> 255) G = 255;
If (B <0) B = 0;
If (B> 255) B = 255;

* (++ Rgbbuff) = (byte) B;
* (++ Rgbbuff) = (byte) g;
* (++ Rgbbuff) = (byte) R;
++ Rgbbuff;
}
}

Inline void yuy2_rgb4 (byte * yuy2buff, byte * rgbbuff, DWORD dwsize)
{

// R = Y + 1.403v'
// G = Y-0.344u '-0.714v'
// B = Y + 1.770u'
Byte * orgrgbbuff = rgbbuff;
For (dword count = 0; count <dwsize; count + = 4)
{
// Y0 U0 Y1 V0
Float Y0 = * yuy2buff;
Float u = * (++ yuy2buff );
Float Y1 = * (++ yuy2buff );
Float v = * (++ yuy2buff );
++ Yuy2buff;

Float R, G, B;

R = (y0 + 1.403f * V );
G = (y0-0.344f * U-0.714f * V );
B = (y0 + 1.77f * U );
If (r <0) r = 0;
If (r> 255) r = 255;
If (G <0) G = 0;
If (G> 255) G = 255;
If (B <0) B = 0;
If (B> 255) B = 255;

* (Rgbbuff) = (byte) R;
* (++ Rgbbuff) = (byte) g;
* (++ Rgbbuff) = (byte) B;
R = (Y1 + 1.403f * V );
G = (Y1-0.344f * U-0.714f * V );
B = (Y1 + 1.77f * U );
If (r <0) r = 0;
If (r> 255) r = 255;
If (G <0) G = 0;
If (G> 255) G = 255;
If (B <0) B = 0;
If (B> 255) B = 255;

* (++ Rgbbuff) = (byte) R;
* (++ Rgbbuff) = (byte) g;
* (++ Rgbbuff) = (byte) B;
++ Rgbbuff;
}
}

Inline void yuy2_rgb3 (byte * yuy2buff, byte * rgbbuff, DWORD dwsize)
{

// B = 1.164 (Y-16) + 2.018 (u-128)
// G = 1.164 (Y-16)-0.813 (V-128)-0.391 (u-128)
// R = 1.164 (Y-16) + 1.596 (V-128)
Byte * orgrgbbuff = rgbbuff;
For (dword count = 0; count <dwsize; count + = 4)
{
// Y0 U0 Y1 V0
Float Y0 = * yuy2buff;
Float u = * (++ yuy2buff );
Float Y1 = * (++ yuy2buff );
Float v = * (++ yuy2buff );
++ Yuy2buff;

* (Rgbbuff) = (byte) (1.164f * (y0-16) + 2.018f * (u- 128 ));
* (++ Rgbbuff) = (byte) (1.164f * (y0-16)-0.813f * (V-128)-0.391f * (u-128 ));
* (++ Rgbbuff) = (byte) (1.164f * (y0-16) + 1.596f * (V-128 ));

* (++ Rgbbuff) = (byte) (1.164f * (y0-16) + 2.018f * (u-128 ));
* (++ Rgbbuff) = (byte) (1.164f * (y0-16)-0.813f * (V-128)-0.391f * (u-128 ));
* (++ Rgbbuff) = (byte) (1.164f * (y0-16) + 1.596f * (V-128 ));
++ Rgbbuff;

}
}
// Http://msdn2.microsoft.com/en-us/library/ms893078.aspx

Void vc4000graber: yuy2_rgb (byte * yuy2buff, byte * rgbbuff, DWORD dwsize)
{
//
// C = Y-16
// D = u-128.
/// E = V-128
// R = clip (298 * C + 409 * E + 128)> 8)
// G = clip (298 * C-100 * D-208 * E + 128)> 8)
// B = clip (298 * C + 516 * D + 128)> 8)
Byte * orgrgbbuff = rgbbuff;
For (dword count = 0; count <dwsize; count + = 4)
{
// Y0 U0 Y1 V0
Byte Y0 = * yuy2buff;
Byte u = * (++ yuy2buff );
Byte Y1 = * (++ yuy2buff );
Byte v = * (++ yuy2buff );
++ Yuy2buff;

Long y, C, D, E;
Byte R, G, B;

Y = y0;
C = Y-16;
D = U-128;
E = V-128;
R = clip255 (298 * C + 409 * E + 128)> 8 );
G = clip255 (298 * C-100 * D-208 * E + 128)> 8 );
B = clip255 (298 * C + 516 * D + 128)> 8 );

* (Rgbbuff) = B;
* (++ Rgbbuff) = g;
* (++ Rgbbuff) = R;

Y = Y1;
C = Y-16;
D = U-128;
E = V-128;
R = clip255 (298 * C + 409 * E + 128)> 8 );
G = clip255 (298 * C-100 * D-208 * E + 128)> 8 );
B = clip255 (298 * C + 516 * D + 128)> 8 );
* (++ Rgbbuff) = B;
* (++ Rgbbuff) = g;
* (++ Rgbbuff) = R;
++ Rgbbuff;

}
}

Byte vc4000graber: clip255 (long V)
{
If (v <0) V = 0;
Else if (V> 255) V = 255;
Return (byte) V;
}