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105 lines
3.5 KiB
105 lines
3.5 KiB
/* |
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* Copyright (C) 2024 Niklas Haas |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef SWSCALE_CMS_H |
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#define SWSCALE_CMS_H |
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#include <stdbool.h> |
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#include "libavutil/csp.h" |
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#include "csputils.h" |
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#include "swscale.h" |
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#include "utils.h" |
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/* Minimum, maximum, and default knee point for perceptual tone mapping [0,1] */ |
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#define PERCEPTUAL_KNEE_MIN 0.10f |
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#define PERCEPTUAL_KNEE_MAX 0.80f |
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#define PERCEPTUAL_KNEE_DEF 0.40f |
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/* Ratio between source average and target average. */ |
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#define PERCEPTUAL_ADAPTATION 0.40f |
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/* (Relative) chromaticity protection zone for perceptual mapping [0,1] */ |
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#define PERCEPTUAL_DEADZONE 0.30f |
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/* Contrast setting for perceptual tone mapping. [0,1.5] */ |
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#define PERCEPTUAL_CONTRAST 0.50f |
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/* Tuning constants for overriding the contrast near extremes */ |
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#define SLOPE_TUNING 1.50f /* [0,10] */ |
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#define SLOPE_OFFSET 0.20f /* [0,1] */ |
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/* Strength of the perceptual saturation mapping component [0,1] */ |
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#define PERCEPTUAL_STRENGTH 0.80f |
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/* Knee point to use for perceptual soft clipping [0,1] */ |
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#define SOFTCLIP_KNEE 0.70f |
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/* I vs C curve gamma to use for colorimetric clipping [0,10] */ |
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#define COLORIMETRIC_GAMMA 1.80f |
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/* Struct describing a color mapping operation */ |
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typedef struct SwsColorMap { |
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SwsColor src; |
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SwsColor dst; |
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SwsIntent intent; |
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} SwsColorMap; |
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/** |
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* Returns true if the given color map is a semantic no-op - that is, |
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* the overall RGB end to end transform would an identity mapping. |
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*/ |
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bool sws_color_map_noop(const SwsColorMap *map); |
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/** |
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* Generates a single end-to-end color mapping 3DLUT embedding a static tone |
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* mapping curve. |
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* |
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* Returns 0 on success, or a negative error code on failure. |
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*/ |
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int sws_color_map_generate_static(v3u16_t *lut, int size, const SwsColorMap *map); |
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/** |
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* Generates a split pair of 3DLUTS, going to IPT and back, allowing an |
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* arbitrary dynamic EETF to be nestled in between these two operations. |
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* |
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* See sws_tone_map_generate(). |
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* |
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* Returns 0 on success, or a negative error code on failure. |
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*/ |
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int sws_color_map_generate_dynamic(v3u16_t *input, v3u16_t *output, |
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int size_input, int size_I, int size_PT, |
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const SwsColorMap *map); |
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/** |
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* Generate a 1D LUT of size `size` adapting intensity (I) levels from the |
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* source to the destination color space. The LUT is normalized to the |
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* relevant intensity range directly. The second channel of each entry returns |
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* the corresponding 15-bit scaling factor for the P/T channels. The scaling |
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* factor k may be applied as `(1 << 15) - k + (PT * k >> 15)`. |
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* |
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* This is designed to be used with sws_gamut_map_generate_dynamic(). |
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* |
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* Returns 0 on success, or a negative error code on failure. |
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*/ |
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void sws_tone_map_generate(v2u16_t *lut, int size, const SwsColorMap *map); |
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#endif // SWSCALE_GAMUT_MAPPING_H
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