mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
150 lines
5.3 KiB
150 lines
5.3 KiB
/* |
|
* 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 */
|
|
|