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