mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-23 15:53:08 +00:00
bac9048265
Most functions are valid over a domain and range of [0.0-1.0] but some are defined over greater. This patch does not deal with AVColorRange and assumes AVCOL_RANGE_JPEG for the returned values. Signed-off-by: Kevin Wheatley <kevin.j.wheatley@gmail.com>
57 lines
2.0 KiB
C
57 lines
2.0 KiB
C
/*
|
|
* 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
|