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/*
* Colorspace conversion defines
* Copyright (c) 2001, 2002, 2003 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Various defines for YUV<->RGB conversion
*/
#ifndef AVUTIL_COLORSPACE_H
#define AVUTIL_COLORSPACE_H
#define SCALEBITS 10
#define ONE_HALF (1 << (SCALEBITS - 1))
#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5))
#define YUV_TO_RGB1_CCIR(cb1, cr1)\
{\
cb = (cb1) - 128;\
cr = (cr1) - 128;\
r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
ONE_HALF;\
b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
}
#define YUV_TO_RGB1_CCIR_BT709(cb1, cr1) \
{ \
cb = (cb1) - 128; \
cr = (cr1) - 128; \
r_add = ONE_HALF + FIX(1.5747 * 255.0 / 224.0) * cr; \
g_add = ONE_HALF - FIX(0.1873 * 255.0 / 224.0) * cb - \
FIX(0.4682 * 255.0 / 224.0) * cr; \
b_add = ONE_HALF + FIX(1.8556 * 255.0 / 224.0) * cb; \
}
// To be used for the BT709 variant as well
#define YUV_TO_RGB2_CCIR(r, g, b, y1)\
{\
y = ((y1) - 16) * FIX(255.0/219.0);\
r = cm[(y + r_add) >> SCALEBITS];\
g = cm[(y + g_add) >> SCALEBITS];\
b = cm[(y + b_add) >> SCALEBITS];\
}
#define YUV_TO_RGB1(cb1, cr1)\
{\
cb = (cb1) - 128;\
cr = (cr1) - 128;\
r_add = FIX(1.40200) * cr + ONE_HALF;\
g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\
b_add = FIX(1.77200) * cb + ONE_HALF;\
}
#define YUV_TO_RGB2(r, g, b, y1)\
{\
y = (y1) << SCALEBITS;\
r = cm[(y + r_add) >> SCALEBITS];\
g = cm[(y + g_add) >> SCALEBITS];\
b = cm[(y + b_add) >> SCALEBITS];\
}
#define Y_CCIR_TO_JPEG(y)\
cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS]
#define Y_JPEG_TO_CCIR(y)\
(((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
#define C_CCIR_TO_JPEG(y)\
cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS]
/* NOTE: the clamp is really necessary! */
static inline int C_JPEG_TO_CCIR(int y) {
y = (((y - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS);
if (y < 16)
y = 16;
return y;
}
#define RGB_TO_Y_CCIR(r, g, b) \
((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \
FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
#define RGB_TO_U_CCIR(r1, g1, b1, shift)\
(((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 + \
FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
#define RGB_TO_V_CCIR(r1, g1, b1, shift)\
(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 - \
FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
#endif /* AVUTIL_COLORSPACE_H */
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