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67 lines
2.4 KiB
67 lines
2.4 KiB
/* |
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* H.274 film grain synthesis |
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* Copyright (c) 2021 Niklas Haas <ffmpeg@haasn.xyz> |
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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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/** |
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* @file |
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* H.274 film grain synthesis. |
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* @author Niklas Haas <ffmpeg@haasn.xyz> |
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*/ |
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#ifndef AVCODEC_H274_H |
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#define AVCODEC_H274_H |
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#include "libavutil/film_grain_params.h" |
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// Must be initialized to {0} prior to first usage |
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typedef struct H274FilmGrainDatabase { |
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// Database of film grain patterns, lazily computed as-needed |
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int8_t db[13 /* h */][13 /* v */][64][64]; |
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uint16_t residency[13 /* h */]; // bit field of v |
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// Temporary buffer for slice generation |
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int16_t slice_tmp[64][64]; |
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} H274FilmGrainDatabase; |
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/** |
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* Check whether ff_h274_apply_film_grain() supports the given parameter combination. |
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* |
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* @param model_id model_id from AVFilmGrainParams to be supplied |
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* @param pix_fmt pixel format of the frames to be supplied |
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*/ |
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static inline int ff_h274_film_grain_params_supported(int model_id, enum AVPixelFormat pix_fmt) |
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{ |
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return model_id == 0 && pix_fmt == AV_PIX_FMT_YUV420P; |
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} |
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// Synthesizes film grain on top of `in` and stores the result to `out`. `out` |
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// must already have been allocated and set to the same size and format as |
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// `in`. |
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// |
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// Returns a negative error code on error, such as invalid params. |
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// If ff_h274_film_grain_params_supported() indicated that the parameters |
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// are supported, no error will be returned if the arguments given to |
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// ff_h274_film_grain_params_supported() coincide with actual values |
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// from the frames and params. |
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int ff_h274_apply_film_grain(AVFrame *out, const AVFrame *in, |
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H274FilmGrainDatabase *db, |
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const AVFilmGrainParams *params); |
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#endif /* AVCODEC_H274_H */
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