/* * Colorspace conversion defines * Copyright (c) 2001, 2002, 2003 Fabrice Bellard * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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(r, g, b) \ ((FIX(0.29900) * (r) + FIX(0.58700) * (g) + \ FIX(0.11400) * (b) + ONE_HALF) >> SCALEBITS) #define RGB_TO_U(r1, g1, b1, shift)\ (((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + \ FIX(0.50000) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) #define RGB_TO_V(r1, g1, b1, shift)\ (((FIX(0.50000) * r1 - FIX(0.41869) * g1 - \ FIX(0.08131) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) #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) #endif /* AVUTIL_COLORSPACE_H */