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https://github.com/FFmpeg/FFmpeg.git
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9779b62624
Functionality used before didn't widen the values from limited to full range. Additionally, now the decoder uses BT.709 where it should be used according to the video resolution. Default for not yet set colorimetry is BT.709 due to most observed HDMV content being HD. BT.709 coefficients were gathered from the first two parts of BT.709 to BT.2020 conversion guide in ARIB STD-B62 (Pt. 1, Chapter 6.2.2). They were additionally confirmed by manually calculating values. Fixes #4637
110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
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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
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* Various defines for YUV<->RGB conversion
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*/
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#ifndef AVUTIL_COLORSPACE_H
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#define AVUTIL_COLORSPACE_H
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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_RGB1_CCIR_BT709(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(1.5747*255.0/224.0) * cr + ONE_HALF;\
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g_add = - FIX(0.1873*255.0/224.0) * cb - FIX(0.4682*255.0/224.0) * cr + \
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ONE_HALF;\
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b_add = FIX(1.8556*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_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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#endif /* AVUTIL_COLORSPACE_H */
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