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40 lines
1.4 KiB
40 lines
1.4 KiB
10 years ago
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/*
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* Copyright (c) 2015 Kevin Wheatley <kevin.j.wheatley@gmail.com>
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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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#ifndef AVUTIL_COLOR_UTILS_H
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#define AVUTIL_COLOR_UTILS_H
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#include "libavutil/pixfmt.h"
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/**
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* Determine a suitable 'gamma' value to match the supplied
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* AVColorTransferCharacteristic.
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*
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* See Apple Technical Note TN2257 (https://developer.apple.com/library/mac/technotes/tn2257/_index.html)
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*
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* @return Will return an approximation to the simple gamma function matching
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* the supplied Transfer Characteristic, Will return 0.0 for any
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* we cannot reasonably match against.
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*/
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double avpriv_get_gamma_from_trc(enum AVColorTransferCharacteristic trc);
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#endif
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