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56 lines
2.0 KiB
56 lines
2.0 KiB
/* |
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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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