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/*
* H.274 film grain synthesis
* Copyright (c) 2021 Niklas Haas <ffmpeg@haasn.xyz>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* H.274 film grain synthesis.
* @author Niklas Haas <ffmpeg@haasn.xyz>
*/
#ifndef AVCODEC_H274_H
#define AVCODEC_H274_H
#include "libavutil/film_grain_params.h"
// Must be initialized to {0} prior to first usage
typedef struct H274FilmGrainDatabase {
// Database of film grain patterns, lazily computed as-needed
int8_t db[13 /* h */][13 /* v */][64][64];
uint16_t residency[13 /* h */]; // bit field of v
// Temporary buffer for slice generation
int16_t slice_tmp[64][64];
} H274FilmGrainDatabase;
/**
* Check whether ff_h274_apply_film_grain() supports the given parameter combination.
*
* @param model_id model_id from AVFilmGrainParams to be supplied
* @param pix_fmt pixel format of the frames to be supplied
*/
static inline int ff_h274_film_grain_params_supported(int model_id, enum AVPixelFormat pix_fmt)
{
return model_id == 0 && pix_fmt == AV_PIX_FMT_YUV420P;
}
// Synthesizes film grain on top of `in` and stores the result to `out`. `out`
// must already have been allocated and set to the same size and format as
// `in`.
//
// Returns a negative error code on error, such as invalid params.
// If ff_h274_film_grain_params_supported() indicated that the parameters
// are supported, no error will be returned if the arguments given to
// ff_h274_film_grain_params_supported() coincide with actual values
// from the frames and params.
int ff_h274_apply_film_grain(AVFrame *out, const AVFrame *in,
H274FilmGrainDatabase *db,
const AVFilmGrainParams *params);
#endif /* AVCODEC_H274_H */
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