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 AVCODEC_COLORSPACE_H 28#define AVCODEC_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_RGB2_CCIR(r, g, b, y1)\ 45{\ 46 y = ((y1) - 16) * FIX(255.0/219.0);\ 47 r = cm[(y + r_add) >> SCALEBITS];\ 48 g = cm[(y + g_add) >> SCALEBITS];\ 49 b = cm[(y + b_add) >> SCALEBITS];\ 50} 51 52#define YUV_TO_RGB1(cb1, cr1)\ 53{\ 54 cb = (cb1) - 128;\ 55 cr = (cr1) - 128;\ 56 r_add = FIX(1.40200) * cr + ONE_HALF;\ 57 g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\ 58 b_add = FIX(1.77200) * cb + ONE_HALF;\ 59} 60 61#define YUV_TO_RGB2(r, g, b, y1)\ 62{\ 63 y = (y1) << SCALEBITS;\ 64 r = cm[(y + r_add) >> SCALEBITS];\ 65 g = cm[(y + g_add) >> SCALEBITS];\ 66 b = cm[(y + b_add) >> SCALEBITS];\ 67} 68 69#define Y_CCIR_TO_JPEG(y)\ 70 cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS] 71 72#define Y_JPEG_TO_CCIR(y)\ 73 (((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS) 74 75#define C_CCIR_TO_JPEG(y)\ 76 cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS] 77 78/* NOTE: the clamp is really necessary! */ 79static inline int C_JPEG_TO_CCIR(int y) { 80 y = (((y - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS); 81 if (y < 16) 82 y = 16; 83 return y; 84} 85 86 87#define RGB_TO_Y(r, g, b) \ 88((FIX(0.29900) * (r) + FIX(0.58700) * (g) + \ 89 FIX(0.11400) * (b) + ONE_HALF) >> SCALEBITS) 90 91#define RGB_TO_U(r1, g1, b1, shift)\ 92(((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + \ 93 FIX(0.50000) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) 94 95#define RGB_TO_V(r1, g1, b1, shift)\ 96(((FIX(0.50000) * r1 - FIX(0.41869) * g1 - \ 97 FIX(0.08131) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) 98 99#define RGB_TO_Y_CCIR(r, g, b) \ 100((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \ 101 FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS) 102 103#define RGB_TO_U_CCIR(r1, g1, b1, shift)\ 104(((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 + \ 105 FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) 106 107#define RGB_TO_V_CCIR(r1, g1, b1, shift)\ 108(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 - \ 109 FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) 110 111#endif /* AVCODEC_COLORSPACE_H */ 112