2 * Copyright (c) 2015 Kevin Wheatley <kevin.j.wheatley@gmail.com>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "libavutil/color_utils.h"
22 #include "libavutil/pixfmt.h"
24 double avpriv_get_gamma_from_trc(enum AVColorTransferCharacteristic trc)
29 case AVCOL_TRC_SMPTE170M:
30 case AVCOL_TRC_SMPTE240M:
31 case AVCOL_TRC_BT1361_ECG:
32 case AVCOL_TRC_BT2020_10:
33 case AVCOL_TRC_BT2020_12:
34 /* these share a segmented TRC, but gamma 1.961 is a close
35 approximation, and also more correct for decoding content */
38 case AVCOL_TRC_GAMMA22:
39 case AVCOL_TRC_IEC61966_2_1:
42 case AVCOL_TRC_GAMMA28:
45 case AVCOL_TRC_LINEAR:
49 gamma = 0.0; // Unknown value representation