/* * 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 */ #ifndef AVUTIL_COLOR_UTILS_H #define AVUTIL_COLOR_UTILS_H #include "libavutil/pixfmt.h" /** * Determine a suitable 'gamma' value to match the supplied * AVColorTransferCharacteristic. * * See Apple Technical Note TN2257 (https://developer.apple.com/library/mac/technotes/tn2257/_index.html) * * @return Will return an approximation to the simple gamma function matching * the supplied Transfer Characteristic, Will return 0.0 for any * we cannot reasonably match against. */ double avpriv_get_gamma_from_trc(enum AVColorTransferCharacteristic trc); typedef double (*avpriv_trc_function)(double); /** * Determine the function needed to apply the given * AVColorTransferCharacteristic to linear input. * * The function returned should expect a nominal domain and range of [0.0-1.0] * values outside of this range maybe valid depending on the chosen * characteristic function. * * @return Will return pointer to the function matching the * supplied Transfer Characteristic. If unspecified will * return NULL: */ avpriv_trc_function avpriv_get_trc_function_from_trc(enum AVColorTransferCharacteristic trc); #endif