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Diffstat (limited to '')
-rw-r--r-- | media/ffvpx/libavutil/color_utils.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/color_utils.h b/media/ffvpx/libavutil/color_utils.h new file mode 100644 index 0000000000..9529006452 --- /dev/null +++ b/media/ffvpx/libavutil/color_utils.h @@ -0,0 +1,56 @@ +/* + * 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 |