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87 lines
2.9 KiB
87 lines
2.9 KiB
/* |
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* Copyright (c) 2022 Niklas Haas |
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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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/** |
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* @file |
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* Various functions for dealing with ICC profiles |
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*/ |
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#ifndef AVFILTER_FFLCMS2_H |
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#define AVFILTER_FFLCMS2_H |
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#include "libavutil/csp.h" |
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#include "libavutil/frame.h" |
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#include "libavutil/pixfmt.h" |
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#include <lcms2.h> |
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typedef struct FFIccContext { |
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void *avctx; |
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cmsContext ctx; |
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cmsToneCurve *curves[AVCOL_TRC_NB]; /* tone curve cache */ |
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} FFIccContext; |
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/** |
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* Initializes an FFIccContext. This must be done prior to using it. |
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* |
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* Returns 0 on success, or a negative error code. |
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*/ |
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int ff_icc_context_init(FFIccContext *s, void *avctx); |
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void ff_icc_context_uninit(FFIccContext *s); |
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/** |
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* Generate an ICC profile for a given combination of color primaries and |
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* transfer function. Both values must be set to valid entries (not |
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* "undefined") for this function to work. |
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* |
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* Returns 0 on success, or a negative error code. |
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*/ |
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int ff_icc_profile_generate(FFIccContext *s, |
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enum AVColorPrimaries color_prim, |
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enum AVColorTransferCharacteristic color_trc, |
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cmsHPROFILE *out_profile); |
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/** |
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* Attach an ICC profile to a frame. Helper wrapper around cmsSaveProfileToMem |
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* and av_frame_new_side_data_from_buf. |
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* |
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* Returns 0 on success, or a negative error code. |
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*/ |
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int ff_icc_profile_attach(FFIccContext *s, cmsHPROFILE profile, AVFrame *frame); |
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/** |
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* Read the color primaries and white point coefficients encoded by an ICC |
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* profile, and return the raw values in `out_primaries`. |
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* |
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* Returns 0 on success, or a negative error code. |
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*/ |
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int ff_icc_profile_read_primaries(FFIccContext *s, cmsHPROFILE profile, |
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AVColorPrimariesDesc *out_primaries); |
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/** |
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* Attempt detecting the transfer characteristic that best approximates the |
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* transfer function encoded by an ICC profile. Sets `out_trc` to |
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* AVCOL_TRC_UNSPECIFIED if no clear match can be identified. |
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* |
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* Returns 0 on success (including no match), or a negative error code. |
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*/ |
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int ff_icc_profile_detect_transfer(FFIccContext *s, cmsHPROFILE profile, |
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enum AVColorTransferCharacteristic *out_trc); |
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#endif /* AVFILTER_FFLCMS2_H */
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