/*
* 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)
#define RGB_TO_Y_JPEG(r, g, b) \
(FFMIN((FIX(
0.
29900) * (r) + FIX(
0.
58700) * (g) + \
FIX(
0.
11400) * (b) + (ONE_HALF)) >> SCALEBITS,
255))
#define RGB_TO_U_JPEG(r1, g1, b1)\
(((- FIX(
0.
16874) * r1 - FIX(
0.
33126) * g1 + \
FIX(
0.
50000) * b1 + (ONE_HALF) -
1) >> (SCALEBITS)) +
128)
#define RGB_TO_V_JPEG(r1, g1, b1)\
(((FIX(
0.
50000) * r1 - FIX(
0.
41869) * g1 - \
FIX(
0.
08131) * b1 + (ONE_HALF) -
1) >> (SCALEBITS)) +
128)
// Conversion macros for 8-bit RGB to YUV
// Derived from ITU-R BT.709-6 (06/2015) Item 3.5
// https://www.itu.int/rec/R-REC-BT.709-6-201506-I/en
#define RGB_TO_Y_BT709(r, g, b) \
((FIX(
0.
21260*
219.
0/
255.
0) * (r) + FIX(
0.
71520*
219.
0/
255.
0) * (g) + \
FIX(
0.
07220*
219.
0/
255.
0) * (b) + (ONE_HALF + (
16 << SCALEBITS))) >> SCALEBITS)
#define RGB_TO_U_BT709(r1, g1, b1, shift)\
(((- FIX(
0.
11457*
224.
0/
255.
0) * r1 - FIX(
0.
38543*
224.
0/
255.
0) * g1 + \
FIX(
0.
50000*
224.
0/
255.
0) * b1 + (ONE_HALF << shift) -
1) >> (SCALEBITS + shift)) +
128)
#define RGB_TO_V_BT709(r1, g1, b1, shift)\
(((FIX(
0.
50000*
224.
0/
255.
0) * r1 - FIX(
0.
45415*
224.
0/
255.
0) * g1 - \
FIX(
0.
04585*
224.
0/
255.
0) * b1 + (ONE_HALF << shift) -
1) >> (SCALEBITS + shift)) +
128)
#define RGB_TO_Y_BT709_FULL(r, g, b) \
(FFMIN((FIX(
0.
21260) * (r) + FIX(
0.
71520) * (g) + \
FIX(
0.
07220) * (b) + (ONE_HALF)) >> SCALEBITS,
255))
#define RGB_TO_U_BT709_FULL(r1, g1, b1)\
(((- FIX(
0.
11457) * r1 - FIX(
0.
38543) * g1 + \
FIX(
0.
50000) * b1 + (ONE_HALF) -
1) >> (SCALEBITS)) +
128)
#define RGB_TO_V_BT709_FULL(r1, g1, b1)\
(((FIX(
0.
50000) * r1 - FIX(
0.
45415) * g1 - \
FIX(
0.
04585) * b1 + (ONE_HALF) -
1) >> (SCALEBITS)) +
128)
#endif /* AVUTIL_COLORSPACE_H */
