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Based on the AOMedia Film Grain Synthesis 1 (AFGS1) spec: https://aomediacodec.github.io/afgs1-spec/ The parsing has been changed substantially relative to the AV1 film grain OBU. In particular: 1. There is the possibility of maintaining multiple independent film grain parameter sets, and decoders/players are recommended to pick the one most appropriate for the intended display resolution. This could also be used to e.g. switch between different grain profiles without having to re-signal the appropriate coefficients. 2. Supporting this, it's possible to *predict* the grain coefficients from previously signalled parameter sets, transmitting only the residual. 3. When not predicting, the parameter sets are now stored as a series of increments, rather than being directly transmitted. 4. There are several new AFGS1-exclusive fields. I placed this parser in its own file, rather than h2645_sei.c, since nothing in the generic AFGS1 film grain payload is specific to T.35, and to compartmentalize the code base.
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/*
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* AOM 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
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* 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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* AOM film grain synthesis.
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* @author Niklas Haas <ffmpeg@haasn.xyz>
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*/
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#ifndef AVCODEC_AOM_FILM_GRAIN_H
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#define AVCODEC_AOM_FILM_GRAIN_H
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#include "libavutil/film_grain_params.h"
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typedef struct AVFilmGrainAFGS1Params {
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int enable;
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AVFilmGrainParams sets[8];
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} AVFilmGrainAFGS1Params;
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// 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 `in`.
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int ff_aom_apply_film_grain(AVFrame *out, const AVFrame *in,
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const AVFilmGrainParams *params);
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// Parse AFGS1 parameter sets from an ITU-T T.35 payload. Returns 0 on success,
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// or a negative error code.
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int ff_aom_parse_film_grain_sets(AVFilmGrainAFGS1Params *s,
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const uint8_t *payload, int payload_size);
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// Attach all valid film grain param sets to `frame`.
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int ff_aom_attach_film_grain_sets(const AVFilmGrainAFGS1Params *s, AVFrame *frame);
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#endif /* AVCODEC_AOM_FILM_GRAIN_H */
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