blob: b6dba2c95ff7a10a90976e2b04600a440ee15ad2
| 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! */ |
| 90 | static 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 | #endif /* AVUTIL_COLORSPACE_H */ |
| 111 |