FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h274.h
Date: 2024-05-26 22:00:00
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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