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/**
* 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
*/
#include "film_grain_params.h"
#include "pixdesc.h"
AVFilmGrainParams *av_film_grain_params_alloc(size_t *size)
{
AVFilmGrainParams *params = av_mallocz(sizeof(AVFilmGrainParams));
if (size)
*size = sizeof(*params);
return params;
}
AVFilmGrainParams *av_film_grain_params_create_side_data(AVFrame *frame)
{
AVFilmGrainParams *fgp;
AVFrameSideData *side_data = av_frame_new_side_data(frame,
AV_FRAME_DATA_FILM_GRAIN_PARAMS,
sizeof(AVFilmGrainParams));
if (!side_data)
return NULL;
fgp = (AVFilmGrainParams *) side_data->data;
*fgp = (AVFilmGrainParams) {
.color_range = AVCOL_RANGE_UNSPECIFIED,
.color_primaries = AVCOL_PRI_UNSPECIFIED,
.color_trc = AVCOL_TRC_UNSPECIFIED,
.color_space = AVCOL_SPC_UNSPECIFIED,
};
return fgp;
}
const AVFilmGrainParams *av_film_grain_params_select(const AVFrame *frame)
{
const AVFilmGrainParams *fgp, *best = NULL;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
int bit_depth_luma, bit_depth_chroma;
if (!desc)
return NULL;
/* There are no YUV formats with different bit depth per component,
* so just check both against the first component for simplicity */
bit_depth_luma = bit_depth_chroma = desc->comp[0].depth;
for (int i = 0; i < frame->nb_side_data; i++) {
if (frame->side_data[i]->type != AV_FRAME_DATA_FILM_GRAIN_PARAMS)
continue;
fgp = (const AVFilmGrainParams*)frame->side_data[i]->data;
if (fgp->width && fgp->width > frame->width ||
fgp->height && fgp->height > frame->height)
continue;
#define CHECK(a, b, unspec) \
if ((a) != (unspec) && (b) != (unspec) && (a) != (b)) \
continue
CHECK(fgp->bit_depth_luma, bit_depth_luma, 0);
CHECK(fgp->bit_depth_chroma, bit_depth_chroma, 0);
CHECK(fgp->color_range, frame->color_range, AVCOL_RANGE_UNSPECIFIED);
CHECK(fgp->color_primaries, frame->color_primaries, AVCOL_PRI_UNSPECIFIED);
CHECK(fgp->color_trc, frame->color_trc, AVCOL_TRC_UNSPECIFIED);
CHECK(fgp->color_space, frame->colorspace, AVCOL_SPC_UNSPECIFIED);
switch (fgp->type) {
case AV_FILM_GRAIN_PARAMS_NONE:
continue;
case AV_FILM_GRAIN_PARAMS_AV1:
/* AOM FGS needs an exact match for the chroma resolution */
if (fgp->subsampling_x != desc->log2_chroma_w ||
fgp->subsampling_y != desc->log2_chroma_h)
continue;
break;
case AV_FILM_GRAIN_PARAMS_H274:
/* H.274 FGS can be adapted to any lower chroma resolution */
if (fgp->subsampling_x > desc->log2_chroma_w ||
fgp->subsampling_y > desc->log2_chroma_h)
continue;
break;
}
if (!best || best->width < fgp->width || best->height < fgp->height)
best = fgp;
}
return best;
}
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