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libavcodec
h274.h
Go to the documentation of this file.
1
/*
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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
9
* 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
29
#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
34
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];
37
uint16_t
residency
[13
/* h */
];
// bit field of v
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39
// Temporary buffer for slice generation
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int16_t
slice_tmp
[64][64];
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}
H274FilmGrainDatabase
;
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43
/**
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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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}
53
54
// 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,
64
H274FilmGrainDatabase
*db,
65
const
AVFilmGrainParams
*params);
66
67
#endif
/* AVCODEC_H274_H */
AVPixelFormat
AVPixelFormat
Pixel format.
Definition:
pixfmt.h:71
out
FILE * out
Definition:
movenc.c:54
ff_h274_apply_film_grain
int ff_h274_apply_film_grain(AVFrame *out, const AVFrame *in, H274FilmGrainDatabase *db, const AVFilmGrainParams *params)
Definition:
h274.c:217
AVFrame
This structure describes decoded (raw) audio or video data.
Definition:
frame.h:344
H274FilmGrainDatabase::slice_tmp
int16_t slice_tmp[64][64]
Definition:
h274.h:40
film_grain_params.h
pix_fmt
static enum AVPixelFormat pix_fmt
Definition:
demux_decode.c:41
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition:
pixfmt.h:73
H274FilmGrainDatabase::db
int8_t db[13][13][64][64]
Definition:
h274.h:36
H274FilmGrainDatabase::residency
uint16_t residency[13]
Definition:
h274.h:37
H274FilmGrainDatabase
Definition:
h274.h:34
AVFilmGrainParams
This structure describes how to handle film grain synthesis in video for specific codecs.
Definition:
film_grain_params.h:238
ff_h274_film_grain_params_supported
static int ff_h274_film_grain_params_supported(int model_id, enum AVPixelFormat pix_fmt)
Check whether ff_h274_apply_film_grain() supports the given parameter combination.
Definition:
h274.h:49
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