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 34typedef 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// Synthesizes film grain on top of `in` and stores the result to `out`. `out` 44// must already have been allocated and set to the same size and format as 45// `in`. 46// 47// Returns a negative error code on error, such as invalid params. 48int ff_h274_apply_film_grain(AVFrame *out, const AVFrame *in, 49 H274FilmGrainDatabase *db, 50 const AVFilmGrainParams *params); 51 52#endif /* AVCODEC_H274_H */ 53