1/* 2 * Colorspace conversion defines 3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * Various defines for YUV<->RGB conversion 25 */ 26 27#ifndef AVUTIL_COLORSPACE_H 28#define AVUTIL_COLORSPACE_H 29 30#define SCALEBITS 10 31#define ONE_HALF (1 << (SCALEBITS - 1)) 32#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5)) 33 34#define YUV_TO_RGB1_CCIR(cb1, cr1)\ 35{\ 36 cb = (cb1) - 128;\ 37 cr = (cr1) - 128;\ 38 r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\ 39 g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \ 40 ONE_HALF;\ 41 b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\ 42} 43 44#define YUV_TO_RGB1_CCIR_BT709(cb1, cr1) \ 45 { \ 46 cb = (cb1) - 128; \ 47 cr = (cr1) - 128; \ 48 r_add = ONE_HALF + FIX(1.5747 * 255.0 / 224.0) * cr; \ 49 g_add = ONE_HALF - FIX(0.1873 * 255.0 / 224.0) * cb - \ 50 FIX(0.4682 * 255.0 / 224.0) * cr; \ 51 b_add = ONE_HALF + FIX(1.8556 * 255.0 / 224.0) * cb; \ 52 } 53 54// To be used for the BT709 variant as well 55#define YUV_TO_RGB2_CCIR(r, g, b, y1)\ 56{\ 57 y = ((y1) - 16) * FIX(255.0/219.0);\ 58 r = cm[(y + r_add) >> SCALEBITS];\ 59 g = cm[(y + g_add) >> SCALEBITS];\ 60 b = cm[(y + b_add) >> SCALEBITS];\ 61} 62 63#define YUV_TO_RGB1(cb1, cr1)\ 64{\ 65 cb = (cb1) - 128;\ 66 cr = (cr1) - 128;\ 67 r_add = FIX(1.40200) * cr + ONE_HALF;\ 68 g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\ 69 b_add = FIX(1.77200) * cb + ONE_HALF;\ 70} 71 72#define YUV_TO_RGB2(r, g, b, y1)\ 73{\ 74 y = (y1) << SCALEBITS;\ 75 r = cm[(y + r_add) >> SCALEBITS];\ 76 g = cm[(y + g_add) >> SCALEBITS];\ 77 b = cm[(y + b_add) >> SCALEBITS];\ 78} 79 80#define Y_CCIR_TO_JPEG(y)\ 81 cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS] 82 83#define Y_JPEG_TO_CCIR(y)\ 84 (((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS) 85 86#define C_CCIR_TO_JPEG(y)\ 87 cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS] 88 89/* NOTE: the clamp is really necessary! */ 90static inline int C_JPEG_TO_CCIR(int y) { 91 y = (((y - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS); 92 if (y < 16) 93 y = 16; 94 return y; 95} 96 97 98#define RGB_TO_Y_CCIR(r, g, b) \ 99((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \ 100 FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS) 101 102#define RGB_TO_U_CCIR(r1, g1, b1, shift)\ 103(((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 + \ 104 FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) 105 106#define RGB_TO_V_CCIR(r1, g1, b1, shift)\ 107(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 - \ 108 FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) 109 110#define RGB_TO_Y_JPEG(r, g, b) \ 111(FFMIN((FIX(0.29900) * (r) + FIX(0.58700) * (g) + \ 112 FIX(0.11400) * (b) + (ONE_HALF)) >> SCALEBITS, 255)) 113 114#define RGB_TO_U_JPEG(r1, g1, b1)\ 115(((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + \ 116 FIX(0.50000) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128) 117 118#define RGB_TO_V_JPEG(r1, g1, b1)\ 119(((FIX(0.50000) * r1 - FIX(0.41869) * g1 - \ 120 FIX(0.08131) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128) 121 122// Conversion macros for 8-bit RGB to YUV 123// Derived from ITU-R BT.709-6 (06/2015) Item 3.5 124// https://www.itu.int/rec/R-REC-BT.709-6-201506-I/en 125 126#define RGB_TO_Y_BT709(r, g, b) \ 127((FIX(0.21260*219.0/255.0) * (r) + FIX(0.71520*219.0/255.0) * (g) + \ 128 FIX(0.07220*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS) 129 130#define RGB_TO_U_BT709(r1, g1, b1, shift)\ 131(((- FIX(0.11457*224.0/255.0) * r1 - FIX(0.38543*224.0/255.0) * g1 + \ 132 FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) 133 134#define RGB_TO_V_BT709(r1, g1, b1, shift)\ 135(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.45415*224.0/255.0) * g1 - \ 136 FIX(0.04585*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) 137 138#define RGB_TO_Y_BT709_FULL(r, g, b) \ 139(FFMIN((FIX(0.21260) * (r) + FIX(0.71520) * (g) + \ 140 FIX(0.07220) * (b) + (ONE_HALF)) >> SCALEBITS, 255)) 141 142#define RGB_TO_U_BT709_FULL(r1, g1, b1)\ 143(((- FIX(0.11457) * r1 - FIX(0.38543) * g1 + \ 144 FIX(0.50000) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128) 145 146#define RGB_TO_V_BT709_FULL(r1, g1, b1)\ 147(((FIX(0.50000) * r1 - FIX(0.45415) * g1 - \ 148 FIX(0.04585) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128) 149 150#endif /* AVUTIL_COLORSPACE_H */ 151