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107 lines
3.5 KiB
107 lines
3.5 KiB
/* |
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* Colorspace conversion defines |
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* Copyright (c) 2001, 2002, 2003 Fabrice Bellard. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file colorspace.h |
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* Various defines for YUV<->RGB conversion |
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*/ |
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#define SCALEBITS 10 |
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#define ONE_HALF (1 << (SCALEBITS - 1)) |
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#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5)) |
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#define YUV_TO_RGB1_CCIR(cb1, cr1)\ |
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{\ |
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cb = (cb1) - 128;\ |
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cr = (cr1) - 128;\ |
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r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\ |
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g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \ |
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ONE_HALF;\ |
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b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\ |
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} |
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#define YUV_TO_RGB2_CCIR(r, g, b, y1)\ |
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{\ |
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y = ((y1) - 16) * FIX(255.0/219.0);\ |
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r = cm[(y + r_add) >> SCALEBITS];\ |
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g = cm[(y + g_add) >> SCALEBITS];\ |
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b = cm[(y + b_add) >> SCALEBITS];\ |
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} |
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#define YUV_TO_RGB1(cb1, cr1)\ |
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{\ |
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cb = (cb1) - 128;\ |
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cr = (cr1) - 128;\ |
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r_add = FIX(1.40200) * cr + ONE_HALF;\ |
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g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\ |
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b_add = FIX(1.77200) * cb + ONE_HALF;\ |
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} |
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#define YUV_TO_RGB2(r, g, b, y1)\ |
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{\ |
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y = (y1) << SCALEBITS;\ |
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r = cm[(y + r_add) >> SCALEBITS];\ |
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g = cm[(y + g_add) >> SCALEBITS];\ |
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b = cm[(y + b_add) >> SCALEBITS];\ |
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} |
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#define Y_CCIR_TO_JPEG(y)\ |
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cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS] |
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#define Y_JPEG_TO_CCIR(y)\ |
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(((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS) |
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#define C_CCIR_TO_JPEG(y)\ |
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cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS] |
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/* NOTE: the clamp is really necessary! */ |
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static inline int C_JPEG_TO_CCIR(int y) { |
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y = (((y - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS); |
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if (y < 16) |
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y = 16; |
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return y; |
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} |
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#define RGB_TO_Y(r, g, b) \ |
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((FIX(0.29900) * (r) + FIX(0.58700) * (g) + \ |
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FIX(0.11400) * (b) + ONE_HALF) >> SCALEBITS) |
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#define RGB_TO_U(r1, g1, b1, shift)\ |
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(((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + \ |
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FIX(0.50000) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) |
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#define RGB_TO_V(r1, g1, b1, shift)\ |
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(((FIX(0.50000) * r1 - FIX(0.41869) * g1 - \ |
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FIX(0.08131) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) |
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#define RGB_TO_Y_CCIR(r, g, b) \ |
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((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \ |
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FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS) |
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#define RGB_TO_U_CCIR(r1, g1, b1, shift)\ |
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(((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 + \ |
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FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) |
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#define RGB_TO_V_CCIR(r1, g1, b1, shift)\ |
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(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 - \ |
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FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) |
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