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52 lines
1.7 KiB
52 lines
1.7 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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#include "libavutil/color_utils.h" |
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#include "libavutil/pixfmt.h" |
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double avpriv_get_gamma_from_trc(enum AVColorTransferCharacteristic trc) |
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{ |
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double gamma; |
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switch (trc) { |
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case AVCOL_TRC_BT709: |
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case AVCOL_TRC_SMPTE170M: |
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case AVCOL_TRC_SMPTE240M: |
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case AVCOL_TRC_BT1361_ECG: |
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case AVCOL_TRC_BT2020_10: |
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case AVCOL_TRC_BT2020_12: |
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/* these share a segmented TRC, but gamma 1.961 is a close |
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approximation, and also more correct for decoding content */ |
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gamma = 1.961; |
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break; |
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case AVCOL_TRC_GAMMA22: |
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case AVCOL_TRC_IEC61966_2_1: |
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gamma = 2.2; |
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break; |
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case AVCOL_TRC_GAMMA28: |
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gamma = 2.8; |
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break; |
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case AVCOL_TRC_LINEAR: |
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gamma = 1.0; |
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break; |
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default: |
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gamma = 0.0; // Unknown value representation |
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} |
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return gamma; |
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}
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