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 // 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.
48 int ff_h274_apply_film_grain(AVFrame *out, const AVFrame *in,
49                              H274FilmGrainDatabase *db,
50                              const AVFilmGrainParams *params);
51 
52 #endif /* AVCODEC_H274_H */
53