blob: 9529006452c358db231647dd3e125bdff88719eb
| 1 | /* |
| 2 | * Copyright (c) 2015 Kevin Wheatley <kevin.j.wheatley@gmail.com> |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 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. |
| 10 | * |
| 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. |
| 15 | * |
| 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 |
| 19 | */ |
| 20 | |
| 21 | #ifndef AVUTIL_COLOR_UTILS_H |
| 22 | #define AVUTIL_COLOR_UTILS_H |
| 23 | |
| 24 | |
| 25 | #include "libavutil/pixfmt.h" |
| 26 | |
| 27 | /** |
| 28 | * Determine a suitable 'gamma' value to match the supplied |
| 29 | * AVColorTransferCharacteristic. |
| 30 | * |
| 31 | * See Apple Technical Note TN2257 (https://developer.apple.com/library/mac/technotes/tn2257/_index.html) |
| 32 | * |
| 33 | * @return Will return an approximation to the simple gamma function matching |
| 34 | * the supplied Transfer Characteristic, Will return 0.0 for any |
| 35 | * we cannot reasonably match against. |
| 36 | */ |
| 37 | double avpriv_get_gamma_from_trc(enum AVColorTransferCharacteristic trc); |
| 38 | |
| 39 | |
| 40 | typedef double (*avpriv_trc_function)(double); |
| 41 | |
| 42 | /** |
| 43 | * Determine the function needed to apply the given |
| 44 | * AVColorTransferCharacteristic to linear input. |
| 45 | * |
| 46 | * The function returned should expect a nominal domain and range of [0.0-1.0] |
| 47 | * values outside of this range maybe valid depending on the chosen |
| 48 | * characteristic function. |
| 49 | * |
| 50 | * @return Will return pointer to the function matching the |
| 51 | * supplied Transfer Characteristic. If unspecified will |
| 52 | * return NULL: |
| 53 | */ |
| 54 | avpriv_trc_function avpriv_get_trc_function_from_trc(enum AVColorTransferCharacteristic trc); |
| 55 | |
| 56 | #endif |
| 57 |