| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * H.274 film grain synthesis | ||
| 3 | * Copyright (c) 2021 Niklas Haas <ffmpeg@haasn.xyz> | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /** | ||
| 23 | * @file | ||
| 24 | * H.274 film grain synthesis. | ||
| 25 | * @author Niklas Haas <ffmpeg@haasn.xyz> | ||
| 26 | */ | ||
| 27 | |||
| 28 | #ifndef AVCODEC_H274_H | ||
| 29 | #define AVCODEC_H274_H | ||
| 30 | |||
| 31 | #include "libavutil/film_grain_params.h" | ||
| 32 | |||
| 33 | // Must be initialized to {0} prior to first usage | ||
| 34 | typedef struct H274FilmGrainDatabase { | ||
| 35 | // Database of film grain patterns, lazily computed as-needed | ||
| 36 | int8_t db[13 /* h */][13 /* v */][64][64]; | ||
| 37 | uint16_t residency[13 /* h */]; // bit field of v | ||
| 38 | |||
| 39 | // Temporary buffer for slice generation | ||
| 40 | int16_t slice_tmp[64][64]; | ||
| 41 | } H274FilmGrainDatabase; | ||
| 42 | |||
| 43 | /** | ||
| 44 | * Check whether ff_h274_apply_film_grain() supports the given parameter combination. | ||
| 45 | * | ||
| 46 | * @param model_id model_id from AVFilmGrainParams to be supplied | ||
| 47 | * @param pix_fmt pixel format of the frames to be supplied | ||
| 48 | */ | ||
| 49 | ✗ | static inline int ff_h274_film_grain_params_supported(int model_id, enum AVPixelFormat pix_fmt) | |
| 50 | { | ||
| 51 | ✗ | return model_id == 0 && pix_fmt == AV_PIX_FMT_YUV420P; | |
| 52 | } | ||
| 53 | |||
| 54 | // Synthesizes film grain on top of `in` and stores the result to `out`. `out` | ||
| 55 | // must already have been allocated and set to the same size and format as | ||
| 56 | // `in`. | ||
| 57 | // | ||
| 58 | // Returns a negative error code on error, such as invalid params. | ||
| 59 | // If ff_h274_film_grain_params_supported() indicated that the parameters | ||
| 60 | // are supported, no error will be returned if the arguments given to | ||
| 61 | // ff_h274_film_grain_params_supported() coincide with actual values | ||
| 62 | // from the frames and params. | ||
| 63 | int ff_h274_apply_film_grain(AVFrame *out, const AVFrame *in, | ||
| 64 | H274FilmGrainDatabase *db, | ||
| 65 | const AVFilmGrainParams *params); | ||
| 66 | |||
| 67 | #endif /* AVCODEC_H274_H */ | ||
| 68 |