diff options
Diffstat (limited to 'libavutil/color_utils.c')
| -rw-r--r-- | libavutil/color_utils.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/libavutil/color_utils.c b/libavutil/color_utils.c new file mode 100644 index 0000000000..59146be8c2 --- /dev/null +++ b/libavutil/color_utils.c @@ -0,0 +1,52 @@ +/* + * Copyright (c) 2015 Kevin Wheatley <kevin.j.wheatley@gmail.com> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/color_utils.h" +#include "libavutil/pixfmt.h" + +double avpriv_get_gamma_from_trc(enum AVColorTransferCharacteristic trc) +{ + double gamma; + switch (trc) { + case AVCOL_TRC_BT709: + case AVCOL_TRC_SMPTE170M: + case AVCOL_TRC_SMPTE240M: + case AVCOL_TRC_BT1361_ECG: + case AVCOL_TRC_BT2020_10: + case AVCOL_TRC_BT2020_12: + /* these share a segmented TRC, but gamma 1.961 is a close + approximation, and also more correct for decoding content */ + gamma = 1.961; + break; + case AVCOL_TRC_GAMMA22: + case AVCOL_TRC_IEC61966_2_1: + gamma = 2.2; + break; + case AVCOL_TRC_GAMMA28: + gamma = 2.8; + break; + case AVCOL_TRC_LINEAR: + gamma = 1.0; + break; + default: + gamma = 0.0; // Unknown value representation + } + return gamma; +} |