mirror of https://git.ffmpeg.org/ffmpeg.git
578 lines
29 KiB
C
578 lines
29 KiB
C
/*
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* AOM film grain synthesis
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* Copyright (c) 2023 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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#include "libavutil/avassert.h"
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#include "libavutil/buffer.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/mem.h"
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#include "aom_film_grain.h"
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#include "get_bits.h"
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// Common/shared helpers (not dependent on BIT_DEPTH)
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static inline int get_random_number(const int bits, unsigned *const state) {
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const int r = *state;
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unsigned bit = ((r >> 0) ^ (r >> 1) ^ (r >> 3) ^ (r >> 12)) & 1;
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*state = (r >> 1) | (bit << 15);
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return (*state >> (16 - bits)) & ((1 << bits) - 1);
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}
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static inline int round2(const int x, const uint64_t shift) {
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return (x + ((1 << shift) >> 1)) >> shift;
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}
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enum {
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GRAIN_WIDTH = 82,
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GRAIN_HEIGHT = 73,
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SUB_GRAIN_WIDTH = 44,
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SUB_GRAIN_HEIGHT = 38,
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FG_BLOCK_SIZE = 32,
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};
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static const int16_t gaussian_sequence[2048];
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#define BIT_DEPTH 16
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#include "aom_film_grain_template.c"
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#undef BIT_DEPTH
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#define BIT_DEPTH 8
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#include "aom_film_grain_template.c"
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#undef BIT_DEPTH
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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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{
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const AVFilmGrainAOMParams *const data = ¶ms->codec.aom;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(out->format);
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const int subx = desc->log2_chroma_w, suby = desc->log2_chroma_h;
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const int pxstep = desc->comp[0].step;
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av_assert0(out->format == in->format);
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av_assert0(params->type == AV_FILM_GRAIN_PARAMS_AV1);
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// Copy over the non-modified planes
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if (!params->codec.aom.num_y_points) {
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av_image_copy_plane(out->data[0], out->linesize[0],
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in->data[0], in->linesize[0],
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out->width * pxstep, out->height);
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}
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for (int uv = 0; uv < 2; uv++) {
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if (!data->num_uv_points[uv]) {
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av_image_copy_plane(out->data[1+uv], out->linesize[1+uv],
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in->data[1+uv], in->linesize[1+uv],
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AV_CEIL_RSHIFT(out->width, subx) * pxstep,
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AV_CEIL_RSHIFT(out->height, suby));
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}
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}
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switch (in->format) {
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case AV_PIX_FMT_GRAY8:
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case AV_PIX_FMT_YUV420P:
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case AV_PIX_FMT_YUV422P:
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case AV_PIX_FMT_YUV444P:
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case AV_PIX_FMT_YUVJ420P:
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case AV_PIX_FMT_YUVJ422P:
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case AV_PIX_FMT_YUVJ444P:
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return apply_film_grain_8(out, in, params);
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case AV_PIX_FMT_GRAY9:
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case AV_PIX_FMT_YUV420P9:
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case AV_PIX_FMT_YUV422P9:
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case AV_PIX_FMT_YUV444P9:
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return apply_film_grain_16(out, in, params, 9);
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case AV_PIX_FMT_GRAY10:
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case AV_PIX_FMT_YUV420P10:
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case AV_PIX_FMT_YUV422P10:
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case AV_PIX_FMT_YUV444P10:
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return apply_film_grain_16(out, in, params, 10);
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case AV_PIX_FMT_GRAY12:
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case AV_PIX_FMT_YUV420P12:
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case AV_PIX_FMT_YUV422P12:
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case AV_PIX_FMT_YUV444P12:
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return apply_film_grain_16(out, in, params, 12);
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}
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/* The AV1 spec only defines film grain synthesis for these formats */
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return AVERROR_INVALIDDATA;
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}
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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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{
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GetBitContext gbc, *gb = &gbc;
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AVFilmGrainAOMParams *aom;
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AVFilmGrainParams *fgp = NULL, *ref = NULL;
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int ret, num_sets, n, i, uv, num_y_coeffs, update_grain, luma_only;
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ret = init_get_bits8(gb, payload, payload_size);
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if (ret < 0)
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return ret;
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s->enable = get_bits1(gb);
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if (!s->enable)
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return 0;
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for (int i = 0; i < FF_ARRAY_ELEMS(s->sets); i++)
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av_buffer_unref(&s->sets[i]);
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skip_bits(gb, 4); // reserved
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num_sets = get_bits(gb, 3) + 1;
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for (n = 0; n < num_sets; n++) {
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int payload_4byte, payload_size, set_idx, apply_units_log2, vsc_flag;
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int predict_scaling, predict_y_scaling, predict_uv_scaling[2];
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int payload_bits, start_position;
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size_t fgp_size;
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start_position = get_bits_count(gb);
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payload_4byte = get_bits1(gb);
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payload_size = get_bits(gb, payload_4byte ? 2 : 8);
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set_idx = get_bits(gb, 3);
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fgp = av_film_grain_params_alloc(&fgp_size);
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if (!fgp)
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goto error;
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aom = &fgp->codec.aom;
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fgp->type = get_bits1(gb) ? AV_FILM_GRAIN_PARAMS_AV1 : AV_FILM_GRAIN_PARAMS_NONE;
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if (!fgp->type) {
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av_freep(&fgp);
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continue;
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}
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fgp->seed = get_bits(gb, 16);
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update_grain = get_bits1(gb);
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if (!update_grain) {
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av_freep(&fgp);
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continue;
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}
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apply_units_log2 = get_bits(gb, 4);
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fgp->width = get_bits(gb, 12) << apply_units_log2;
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fgp->height = get_bits(gb, 12) << apply_units_log2;
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luma_only = get_bits1(gb);
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if (luma_only) {
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fgp->subsampling_x = fgp->subsampling_y = 0;
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} else {
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fgp->subsampling_x = get_bits1(gb);
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fgp->subsampling_y = get_bits1(gb);
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}
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fgp->bit_depth_luma = fgp->bit_depth_chroma = 0;
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fgp->color_primaries = AVCOL_PRI_UNSPECIFIED;
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fgp->color_trc = AVCOL_TRC_UNSPECIFIED;
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fgp->color_space = AVCOL_SPC_UNSPECIFIED;
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fgp->color_range = AVCOL_RANGE_UNSPECIFIED;
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vsc_flag = get_bits1(gb); // video_signal_characteristics_flag
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if (vsc_flag) {
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int cicp_flag;
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fgp->bit_depth_luma = get_bits(gb, 3) + 8;
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if (!luma_only)
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fgp->bit_depth_chroma = fgp->bit_depth_luma;
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cicp_flag = get_bits1(gb);
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if (cicp_flag) {
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fgp->color_primaries = get_bits(gb, 8);
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fgp->color_trc = get_bits(gb, 8);
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fgp->color_space = get_bits(gb, 8);
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fgp->color_range = get_bits1(gb) ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
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if (fgp->color_primaries > AVCOL_PRI_NB ||
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fgp->color_primaries == AVCOL_PRI_RESERVED ||
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fgp->color_primaries == AVCOL_PRI_RESERVED0 ||
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fgp->color_trc > AVCOL_TRC_NB ||
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fgp->color_trc == AVCOL_TRC_RESERVED ||
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fgp->color_trc == AVCOL_TRC_RESERVED0 ||
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fgp->color_space > AVCOL_SPC_NB ||
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fgp->color_space == AVCOL_SPC_RESERVED)
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goto error;
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}
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}
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predict_scaling = get_bits1(gb);
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if (predict_scaling && (!ref || ref == fgp))
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goto error; // prediction must be from valid, different set
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predict_y_scaling = predict_scaling ? get_bits1(gb) : 0;
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if (predict_y_scaling) {
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int y_scale, y_offset, bits_res;
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y_scale = get_bits(gb, 9) - 256;
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y_offset = get_bits(gb, 9) - 256;
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bits_res = get_bits(gb, 3);
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if (bits_res) {
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int res[14], pred, granularity;
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aom->num_y_points = ref->codec.aom.num_y_points;
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for (i = 0; i < aom->num_y_points; i++)
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res[i] = get_bits(gb, bits_res);
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granularity = get_bits(gb, 3);
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for (i = 0; i < aom->num_y_points; i++) {
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pred = ref->codec.aom.y_points[i][1];
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pred = ((pred * y_scale + 8) >> 4) + y_offset;
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pred += (res[i] - (1 << (bits_res - 1))) * granularity;
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aom->y_points[i][0] = ref->codec.aom.y_points[i][0];
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aom->y_points[i][1] = av_clip_uint8(pred);
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}
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}
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} else {
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aom->num_y_points = get_bits(gb, 4);
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if (aom->num_y_points > 14) {
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goto error;
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} else if (aom->num_y_points) {
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int bits_inc, bits_scaling;
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int y_value = 0;
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bits_inc = get_bits(gb, 3) + 1;
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bits_scaling = get_bits(gb, 2) + 5;
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for (i = 0; i < aom->num_y_points; i++) {
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y_value += get_bits(gb, bits_inc);
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if (y_value > UINT8_MAX)
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goto error;
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aom->y_points[i][0] = y_value;
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aom->y_points[i][1] = get_bits(gb, bits_scaling);
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}
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}
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}
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if (luma_only) {
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aom->chroma_scaling_from_luma = 0;
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aom->num_uv_points[0] = aom->num_uv_points[1] = 0;
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} else {
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aom->chroma_scaling_from_luma = get_bits1(gb);
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if (aom->chroma_scaling_from_luma) {
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aom->num_uv_points[0] = aom->num_uv_points[1] = 0;
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} else {
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for (uv = 0; uv < 2; uv++) {
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predict_uv_scaling[uv] = predict_scaling ? get_bits1(gb) : 0;
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if (predict_uv_scaling[uv]) {
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int uv_scale, uv_offset, bits_res;
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uv_scale = get_bits(gb, 9) - 256;
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uv_offset = get_bits(gb, 9) - 256;
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bits_res = get_bits(gb, 3);
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aom->uv_mult[uv] = ref->codec.aom.uv_mult[uv];
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aom->uv_mult_luma[uv] = ref->codec.aom.uv_mult_luma[uv];
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aom->uv_offset[uv] = ref->codec.aom.uv_offset[uv];
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if (bits_res) {
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int res[10], pred, granularity;
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aom->num_uv_points[uv] = ref->codec.aom.num_uv_points[uv];
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for (i = 0; i < aom->num_uv_points[uv]; i++)
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res[i] = get_bits(gb, bits_res);
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granularity = get_bits(gb, 3);
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for (i = 0; i < aom->num_uv_points[uv]; i++) {
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pred = ref->codec.aom.uv_points[uv][i][1];
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pred = ((pred * uv_scale + 8) >> 4) + uv_offset;
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pred += (res[i] - (1 << (bits_res - 1))) * granularity;
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aom->uv_points[uv][i][0] = ref->codec.aom.uv_points[uv][i][0];
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aom->uv_points[uv][i][1] = av_clip_uint8(pred);
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}
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}
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} else {
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int bits_inc, bits_scaling, uv_offset;
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int uv_value = 0;
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aom->num_uv_points[uv] = get_bits(gb, 4);
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if (aom->num_uv_points[uv] > 10)
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goto error;
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bits_inc = get_bits(gb, 3) + 1;
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bits_scaling = get_bits(gb, 2) + 5;
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uv_offset = get_bits(gb, 8);
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for (i = 0; i < aom->num_uv_points[uv]; i++) {
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uv_value += get_bits(gb, bits_inc);
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if (uv_value > UINT8_MAX)
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goto error;
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aom->uv_points[uv][i][0] = uv_value;
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aom->uv_points[uv][i][1] = get_bits(gb, bits_scaling) + uv_offset;
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}
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}
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}
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}
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}
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aom->scaling_shift = get_bits(gb, 2) + 8;
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aom->ar_coeff_lag = get_bits(gb, 2);
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num_y_coeffs = 2 * aom->ar_coeff_lag * (aom->ar_coeff_lag + 1);
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if (aom->num_y_points) {
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int ar_bits = get_bits(gb, 2) + 5;
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for (i = 0; i < num_y_coeffs; i++)
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aom->ar_coeffs_y[i] = get_bits(gb, ar_bits) - (1 << (ar_bits - 1));
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}
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for (uv = 0; uv < 2; uv++) {
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if (aom->chroma_scaling_from_luma || aom->num_uv_points[uv]) {
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int ar_bits = get_bits(gb, 2) + 5;
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for (i = 0; i < num_y_coeffs + !!aom->num_y_points; i++)
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aom->ar_coeffs_uv[uv][i] = get_bits(gb, ar_bits) - (1 << (ar_bits - 1));
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}
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}
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aom->ar_coeff_shift = get_bits(gb, 2) + 6;
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aom->grain_scale_shift = get_bits(gb, 2);
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for (uv = 0; uv < 2; uv++) {
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if (aom->num_uv_points[uv] && !predict_uv_scaling[uv]) {
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aom->uv_mult[uv] = get_bits(gb, 8) - 128;
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aom->uv_mult_luma[uv] = get_bits(gb, 8) - 128;
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aom->uv_offset[uv] = get_bits(gb, 9) - 256;
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}
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}
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aom->overlap_flag = get_bits1(gb);
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aom->limit_output_range = get_bits1(gb);
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// use first set as reference only if it was fully transmitted
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if (n == 0)
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ref = fgp;
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payload_bits = get_bits_count(gb) - start_position;
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if (payload_bits > payload_size * 8)
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goto error;
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skip_bits(gb, payload_size * 8 - payload_bits);
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av_buffer_unref(&s->sets[set_idx]);
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s->sets[set_idx] = av_buffer_create((uint8_t *)fgp, fgp_size, NULL, NULL, 0);
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if (!s->sets[set_idx])
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goto error;
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}
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return 0;
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error:
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av_free(fgp);
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ff_aom_uninit_film_grain_params(s);
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return AVERROR_INVALIDDATA;
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}
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int ff_aom_attach_film_grain_sets(const AVFilmGrainAFGS1Params *s, AVFrame *frame)
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{
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if (!s->enable)
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return 0;
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for (int i = 0; i < FF_ARRAY_ELEMS(s->sets); i++) {
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AVBufferRef *buf;
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if (!s->sets[i])
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continue;
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buf = av_buffer_ref(s->sets[i]);
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if (!buf || !av_frame_new_side_data_from_buf(frame,
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AV_FRAME_DATA_FILM_GRAIN_PARAMS, buf)) {
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av_buffer_unref(&buf);
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return AVERROR(ENOMEM);
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}
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}
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return 0;
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}
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void ff_aom_uninit_film_grain_params(AVFilmGrainAFGS1Params *s)
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{
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for (int i = 0; i < FF_ARRAY_ELEMS(s->sets); i++)
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av_buffer_unref(&s->sets[i]);
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s->enable = 0;
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}
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// Taken from the AV1 spec. Range is [-2048, 2047], mean is 0 and stddev is 512
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static const int16_t gaussian_sequence[2048] = {
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56, 568, -180, 172, 124, -84, 172, -64, -900, 24, 820,
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224, 1248, 996, 272, -8, -916, -388, -732, -104, -188, 800,
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112, -652, -320, -376, 140, -252, 492, -168, 44, -788, 588,
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-584, 500, -228, 12, 680, 272, -476, 972, -100, 652, 368,
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432, -196, -720, -192, 1000, -332, 652, -136, -552, -604, -4,
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192, -220, -136, 1000, -52, 372, -96, -624, 124, -24, 396,
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540, -12, -104, 640, 464, 244, -208, -84, 368, -528, -740,
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248, -968, -848, 608, 376, -60, -292, -40, -156, 252, -292,
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248, 224, -280, 400, -244, 244, -60, 76, -80, 212, 532,
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340, 128, -36, 824, -352, -60, -264, -96, -612, 416, -704,
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220, -204, 640, -160, 1220, -408, 900, 336, 20, -336, -96,
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-792, 304, 48, -28, -1232, -1172, -448, 104, -292, -520, 244,
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60, -948, 0, -708, 268, 108, 356, -548, 488, -344, -136,
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488, -196, -224, 656, -236, -1128, 60, 4, 140, 276, -676,
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-376, 168, -108, 464, 8, 564, 64, 240, 308, -300, -400,
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-456, -136, 56, 120, -408, -116, 436, 504, -232, 328, 844,
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-164, -84, 784, -168, 232, -224, 348, -376, 128, 568, 96,
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|
-1244, -288, 276, 848, 832, -360, 656, 464, -384, -332, -356,
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428, -484
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};
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