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bac9048265
Most functions are valid over a domain and range of [0.0-1.0] but some are defined over greater. This patch does not deal with AVColorRange and assumes AVCOL_RANGE_JPEG for the returned values. Signed-off-by: Kevin Wheatley <kevin.j.wheatley@gmail.com>
57 lines
2.0 KiB
C
57 lines
2.0 KiB
C
/*
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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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typedef double (*avpriv_trc_function)(double);
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/**
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* Determine the function needed to apply the given
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* AVColorTransferCharacteristic to linear input.
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*
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* The function returned should expect a nominal domain and range of [0.0-1.0]
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* values outside of this range maybe valid depending on the chosen
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* characteristic function.
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*
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* @return Will return pointer to the function matching the
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* supplied Transfer Characteristic. If unspecified will
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* return NULL:
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*/
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avpriv_trc_function avpriv_get_trc_function_from_trc(enum AVColorTransferCharacteristic trc);
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#endif
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