/* * AOM film grain synthesis * Copyright (c) 2023 Niklas Haas * * 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 * AOM film grain synthesis. * @author Niklas Haas */ #include "libavutil/avassert.h" #include "libavutil/buffer.h" #include "libavutil/imgutils.h" #include "libavutil/mem.h" #include "aom_film_grain.h" #include "get_bits.h" // Common/shared helpers (not dependent on BIT_DEPTH) static inline int get_random_number(const int bits, unsigned *const state) { const int r = *state; unsigned bit = ((r >> 0) ^ (r >> 1) ^ (r >> 3) ^ (r >> 12)) & 1; *state = (r >> 1) | (bit << 15); return (*state >> (16 - bits)) & ((1 << bits) - 1); } static inline int round2(const int x, const uint64_t shift) { return (x + ((1 << shift) >> 1)) >> shift; } enum { GRAIN_WIDTH = 82, GRAIN_HEIGHT = 73, SUB_GRAIN_WIDTH = 44, SUB_GRAIN_HEIGHT = 38, FG_BLOCK_SIZE = 32, }; static const int16_t gaussian_sequence[2048]; #define BIT_DEPTH 16 #include "aom_film_grain_template.c" #undef BIT_DEPTH #define BIT_DEPTH 8 #include "aom_film_grain_template.c" #undef BIT_DEPTH int ff_aom_apply_film_grain(AVFrame *out, const AVFrame *in, const AVFilmGrainParams *params) { const AVFilmGrainAOMParams *const data = ¶ms->codec.aom; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(out->format); const int subx = desc->log2_chroma_w, suby = desc->log2_chroma_h; const int pxstep = desc->comp[0].step; av_assert0(out->format == in->format); av_assert0(params->type == AV_FILM_GRAIN_PARAMS_AV1); // Copy over the non-modified planes if (!params->codec.aom.num_y_points) { av_image_copy_plane(out->data[0], out->linesize[0], in->data[0], in->linesize[0], out->width * pxstep, out->height); } for (int uv = 0; uv < 2; uv++) { if (!data->num_uv_points[uv]) { av_image_copy_plane(out->data[1+uv], out->linesize[1+uv], in->data[1+uv], in->linesize[1+uv], AV_CEIL_RSHIFT(out->width, subx) * pxstep, AV_CEIL_RSHIFT(out->height, suby)); } } switch (in->format) { case AV_PIX_FMT_GRAY8: case AV_PIX_FMT_YUV420P: case AV_PIX_FMT_YUV422P: case AV_PIX_FMT_YUV444P: case AV_PIX_FMT_YUVJ420P: case AV_PIX_FMT_YUVJ422P: case AV_PIX_FMT_YUVJ444P: return apply_film_grain_8(out, in, params); case AV_PIX_FMT_GRAY9: case AV_PIX_FMT_YUV420P9: case AV_PIX_FMT_YUV422P9: case AV_PIX_FMT_YUV444P9: return apply_film_grain_16(out, in, params, 9); case AV_PIX_FMT_GRAY10: case AV_PIX_FMT_YUV420P10: case AV_PIX_FMT_YUV422P10: case AV_PIX_FMT_YUV444P10: return apply_film_grain_16(out, in, params, 10); case AV_PIX_FMT_GRAY12: case AV_PIX_FMT_YUV420P12: case AV_PIX_FMT_YUV422P12: case AV_PIX_FMT_YUV444P12: return apply_film_grain_16(out, in, params, 12); } /* The AV1 spec only defines film grain synthesis for these formats */ return AVERROR_INVALIDDATA; } int ff_aom_parse_film_grain_sets(AVFilmGrainAFGS1Params *s, const uint8_t *payload, int payload_size) { GetBitContext gbc, *gb = &gbc; AVFilmGrainAOMParams *aom; AVFilmGrainParams *fgp = NULL, *ref = NULL; int ret, num_sets, n, i, uv, num_y_coeffs, update_grain, luma_only; ret = init_get_bits8(gb, payload, payload_size); if (ret < 0) return ret; s->enable = get_bits1(gb); if (!s->enable) return 0; for (int i = 0; i < FF_ARRAY_ELEMS(s->sets); i++) av_buffer_unref(&s->sets[i]); skip_bits(gb, 4); // reserved num_sets = get_bits(gb, 3) + 1; for (n = 0; n < num_sets; n++) { int payload_4byte, payload_size, set_idx, apply_units_log2, vsc_flag; int predict_scaling, predict_y_scaling, predict_uv_scaling[2]; int payload_bits, start_position; size_t fgp_size; start_position = get_bits_count(gb); payload_4byte = get_bits1(gb); payload_size = get_bits(gb, payload_4byte ? 2 : 8); set_idx = get_bits(gb, 3); fgp = av_film_grain_params_alloc(&fgp_size); if (!fgp) goto error; aom = &fgp->codec.aom; fgp->type = get_bits1(gb) ? AV_FILM_GRAIN_PARAMS_AV1 : AV_FILM_GRAIN_PARAMS_NONE; if (!fgp->type) { av_freep(&fgp); continue; } fgp->seed = get_bits(gb, 16); update_grain = get_bits1(gb); if (!update_grain) { av_freep(&fgp); continue; } apply_units_log2 = get_bits(gb, 4); fgp->width = get_bits(gb, 12) << apply_units_log2; fgp->height = get_bits(gb, 12) << apply_units_log2; luma_only = get_bits1(gb); if (luma_only) { fgp->subsampling_x = fgp->subsampling_y = 0; } else { fgp->subsampling_x = get_bits1(gb); fgp->subsampling_y = get_bits1(gb); } fgp->bit_depth_luma = fgp->bit_depth_chroma = 0; fgp->color_primaries = AVCOL_PRI_UNSPECIFIED; fgp->color_trc = AVCOL_TRC_UNSPECIFIED; fgp->color_space = AVCOL_SPC_UNSPECIFIED; fgp->color_range = AVCOL_RANGE_UNSPECIFIED; vsc_flag = get_bits1(gb); // video_signal_characteristics_flag if (vsc_flag) { int cicp_flag; fgp->bit_depth_luma = get_bits(gb, 3) + 8; if (!luma_only) fgp->bit_depth_chroma = fgp->bit_depth_luma; cicp_flag = get_bits1(gb); if (cicp_flag) { fgp->color_primaries = get_bits(gb, 8); fgp->color_trc = get_bits(gb, 8); fgp->color_space = get_bits(gb, 8); fgp->color_range = get_bits1(gb) ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG; if (fgp->color_primaries > AVCOL_PRI_NB || fgp->color_primaries == AVCOL_PRI_RESERVED || fgp->color_primaries == AVCOL_PRI_RESERVED0 || fgp->color_trc > AVCOL_TRC_NB || fgp->color_trc == AVCOL_TRC_RESERVED || fgp->color_trc == AVCOL_TRC_RESERVED0 || fgp->color_space > AVCOL_SPC_NB || fgp->color_space == AVCOL_SPC_RESERVED) goto error; } } predict_scaling = get_bits1(gb); if (predict_scaling && (!ref || ref == fgp)) goto error; // prediction must be from valid, different set predict_y_scaling = predict_scaling ? get_bits1(gb) : 0; if (predict_y_scaling) { int y_scale, y_offset, bits_res; y_scale = get_bits(gb, 9) - 256; y_offset = get_bits(gb, 9) - 256; bits_res = get_bits(gb, 3); if (bits_res) { int res[14], pred, granularity; aom->num_y_points = ref->codec.aom.num_y_points; for (i = 0; i < aom->num_y_points; i++) res[i] = get_bits(gb, bits_res); granularity = get_bits(gb, 3); for (i = 0; i < aom->num_y_points; i++) { pred = ref->codec.aom.y_points[i][1]; pred = ((pred * y_scale + 8) >> 4) + y_offset; pred += (res[i] - (1 << (bits_res - 1))) * granularity; aom->y_points[i][0] = ref->codec.aom.y_points[i][0]; aom->y_points[i][1] = av_clip_uint8(pred); } } } else { aom->num_y_points = get_bits(gb, 4); if (aom->num_y_points > 14) { goto error; } else if (aom->num_y_points) { int bits_inc, bits_scaling; int y_value = 0; bits_inc = get_bits(gb, 3) + 1; bits_scaling = get_bits(gb, 2) + 5; for (i = 0; i < aom->num_y_points; i++) { y_value += get_bits(gb, bits_inc); if (y_value > UINT8_MAX) goto error; aom->y_points[i][0] = y_value; aom->y_points[i][1] = get_bits(gb, bits_scaling); } } } if (luma_only) { aom->chroma_scaling_from_luma = 0; aom->num_uv_points[0] = aom->num_uv_points[1] = 0; } else { aom->chroma_scaling_from_luma = get_bits1(gb); if (aom->chroma_scaling_from_luma) { aom->num_uv_points[0] = aom->num_uv_points[1] = 0; } else { for (uv = 0; uv < 2; uv++) { predict_uv_scaling[uv] = predict_scaling ? get_bits1(gb) : 0; if (predict_uv_scaling[uv]) { int uv_scale, uv_offset, bits_res; uv_scale = get_bits(gb, 9) - 256; uv_offset = get_bits(gb, 9) - 256; bits_res = get_bits(gb, 3); aom->uv_mult[uv] = ref->codec.aom.uv_mult[uv]; aom->uv_mult_luma[uv] = ref->codec.aom.uv_mult_luma[uv]; aom->uv_offset[uv] = ref->codec.aom.uv_offset[uv]; if (bits_res) { int res[10], pred, granularity; aom->num_uv_points[uv] = ref->codec.aom.num_uv_points[uv]; for (i = 0; i < aom->num_uv_points[uv]; i++) res[i] = get_bits(gb, bits_res); granularity = get_bits(gb, 3); for (i = 0; i < aom->num_uv_points[uv]; i++) { pred = ref->codec.aom.uv_points[uv][i][1]; pred = ((pred * uv_scale + 8) >> 4) + uv_offset; pred += (res[i] - (1 << (bits_res - 1))) * granularity; aom->uv_points[uv][i][0] = ref->codec.aom.uv_points[uv][i][0]; aom->uv_points[uv][i][1] = av_clip_uint8(pred); } } } else { int bits_inc, bits_scaling, uv_offset; int uv_value = 0; aom->num_uv_points[uv] = get_bits(gb, 4); if (aom->num_uv_points[uv] > 10) goto error; bits_inc = get_bits(gb, 3) + 1; bits_scaling = get_bits(gb, 2) + 5; uv_offset = get_bits(gb, 8); for (i = 0; i < aom->num_uv_points[uv]; i++) { uv_value += get_bits(gb, bits_inc); if (uv_value > UINT8_MAX) goto error; aom->uv_points[uv][i][0] = uv_value; aom->uv_points[uv][i][1] = get_bits(gb, bits_scaling) + uv_offset; } } } } } aom->scaling_shift = get_bits(gb, 2) + 8; aom->ar_coeff_lag = get_bits(gb, 2); num_y_coeffs = 2 * aom->ar_coeff_lag * (aom->ar_coeff_lag + 1); if (aom->num_y_points) { int ar_bits = get_bits(gb, 2) + 5; for (i = 0; i < num_y_coeffs; i++) aom->ar_coeffs_y[i] = get_bits(gb, ar_bits) - (1 << (ar_bits - 1)); } for (uv = 0; uv < 2; uv++) { if (aom->chroma_scaling_from_luma || aom->num_uv_points[uv]) { int ar_bits = get_bits(gb, 2) + 5; for (i = 0; i < num_y_coeffs + !!aom->num_y_points; i++) aom->ar_coeffs_uv[uv][i] = get_bits(gb, ar_bits) - (1 << (ar_bits - 1)); } } aom->ar_coeff_shift = get_bits(gb, 2) + 6; aom->grain_scale_shift = get_bits(gb, 2); for (uv = 0; uv < 2; uv++) { if (aom->num_uv_points[uv] && !predict_uv_scaling[uv]) { aom->uv_mult[uv] = get_bits(gb, 8) - 128; aom->uv_mult_luma[uv] = get_bits(gb, 8) - 128; aom->uv_offset[uv] = get_bits(gb, 9) - 256; } } aom->overlap_flag = get_bits1(gb); aom->limit_output_range = get_bits1(gb); // use first set as reference only if it was fully transmitted if (n == 0) ref = fgp; payload_bits = get_bits_count(gb) - start_position; if (payload_bits > payload_size * 8) goto error; skip_bits(gb, payload_size * 8 - payload_bits); av_buffer_unref(&s->sets[set_idx]); s->sets[set_idx] = av_buffer_create((uint8_t *)fgp, fgp_size, NULL, NULL, 0); if (!s->sets[set_idx]) goto error; } return 0; error: av_free(fgp); ff_aom_uninit_film_grain_params(s); return AVERROR_INVALIDDATA; } int ff_aom_attach_film_grain_sets(const AVFilmGrainAFGS1Params *s, AVFrame *frame) { if (!s->enable) return 0; for (int i = 0; i < FF_ARRAY_ELEMS(s->sets); i++) { AVBufferRef *buf; if (!s->sets[i]) continue; buf = av_buffer_ref(s->sets[i]); if (!buf || !av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_FILM_GRAIN_PARAMS, buf)) { av_buffer_unref(&buf); return AVERROR(ENOMEM); } } return 0; } void ff_aom_uninit_film_grain_params(AVFilmGrainAFGS1Params *s) { for (int i = 0; i < FF_ARRAY_ELEMS(s->sets); i++) av_buffer_unref(&s->sets[i]); s->enable = 0; } // Taken from the AV1 spec. Range is [-2048, 2047], mean is 0 and stddev is 512 static const int16_t gaussian_sequence[2048] = { 56, 568, -180, 172, 124, -84, 172, -64, -900, 24, 820, 224, 1248, 996, 272, -8, -916, -388, -732, -104, -188, 800, 112, -652, -320, -376, 140, -252, 492, -168, 44, -788, 588, -584, 500, -228, 12, 680, 272, -476, 972, -100, 652, 368, 432, -196, -720, -192, 1000, -332, 652, -136, -552, -604, -4, 192, -220, -136, 1000, -52, 372, -96, -624, 124, -24, 396, 540, -12, -104, 640, 464, 244, -208, -84, 368, -528, -740, 248, -968, -848, 608, 376, -60, -292, -40, -156, 252, -292, 248, 224, -280, 400, -244, 244, -60, 76, -80, 212, 532, 340, 128, -36, 824, -352, -60, -264, -96, -612, 416, -704, 220, -204, 640, -160, 1220, -408, 900, 336, 20, -336, -96, -792, 304, 48, -28, -1232, -1172, -448, 104, -292, -520, 244, 60, -948, 0, -708, 268, 108, 356, -548, 488, -344, -136, 488, -196, -224, 656, -236, -1128, 60, 4, 140, 276, -676, -376, 168, -108, 464, 8, 564, 64, 240, 308, -300, -400, -456, -136, 56, 120, -408, -116, 436, 504, -232, 328, 844, -164, -84, 784, -168, 232, -224, 348, -376, 128, 568, 96, -1244, -288, 276, 848, 832, -360, 656, 464, -384, -332, -356, 728, -388, 160, -192, 468, 296, 224, 140, -776, -100, 280, 4, 196, 44, -36, -648, 932, 16, 1428, 28, 528, 808, 772, 20, 268, 88, -332, -284, 124, -384, -448, 208, -228, -1044, -328, 660, 380, -148, -300, 588, 240, 540, 28, 136, -88, -436, 256, 296, -1000, 1400, 0, -48, 1056, -136, 264, -528, -1108, 632, -484, -592, -344, 796, 124, -668, -768, 388, 1296, -232, -188, -200, -288, -4, 308, 100, -168, 256, -500, 204, -508, 648, -136, 372, -272, -120, -1004, -552, -548, -384, 548, -296, 428, -108, -8, -912, -324, -224, -88, -112, -220, -100, 996, -796, 548, 360, -216, 180, 428, -200, -212, 148, 96, 148, 284, 216, -412, -320, 120, -300, -384, -604, -572, -332, -8, -180, -176, 696, 116, -88, 628, 76, 44, -516, 240, -208, -40, 100, -592, 344, -308, -452, -228, 20, 916, -1752, -136, -340, -804, 140, 40, 512, 340, 248, 184, -492, 896, -156, 932, -628, 328, -688, -448, -616, -752, -100, 560, -1020, 180, -800, -64, 76, 576, 1068, 396, 660, 552, -108, -28, 320, -628, 312, -92, -92, -472, 268, 16, 560, 516, -672, -52, 492, -100, 260, 384, 284, 292, 304, -148, 88, -152, 1012, 1064, -228, 164, -376, -684, 592, -392, 156, 196, -524, -64, -884, 160, -176, 636, 648, 404, -396, -436, 864, 424, -728, 988, -604, 904, -592, 296, -224, 536, -176, -920, 436, -48, 1176, -884, 416, -776, -824, -884, 524, -548, -564, -68, -164, -96, 692, 364, -692, -1012, -68, 260, -480, 876, -1116, 452, -332, -352, 892, -1088, 1220, -676, 12, -292, 244, 496, 372, -32, 280, 200, 112, -440, -96, 24, -644, -184, 56, -432, 224, -980, 272, -260, 144, -436, 420, 356, 364, -528, 76, 172, -744, -368, 404, -752, -416, 684, -688, 72, 540, 416, 92, 444, 480, -72, -1416, 164, -1172, -68, 24, 424, 264, 1040, 128, -912, -524, -356, 64, 876, -12, 4, -88, 532, 272, -524, 320, 276, -508, 940, 24, -400, -120, 756, 60, 236, -412, 100, 376, -484, 400, -100, -740, -108, -260, 328, -268, 224, -200, -416, 184, -604, -564, -20, 296, 60, 892, -888, 60, 164, 68, -760, 216, -296, 904, -336, -28, 404, -356, -568, -208, -1480, -512, 296, 328, -360, -164, -1560, -776, 1156, -428, 164, -504, -112, 120, -216, -148, -264, 308, 32, 64, -72, 72, 116, 176, -64, -272, 460, -536, -784, -280, 348, 108, -752, -132, 524, -540, -776, 116, -296, -1196, -288, -560, 1040, -472, 116, -848, -1116, 116, 636, 696, 284, -176, 1016, 204, -864, -648, -248, 356, 972, -584, -204, 264, 880, 528, -24, -184, 116, 448, -144, 828, 524, 212, -212, 52, 12, 200, 268, -488, -404, -880, 824, -672, -40, 908, -248, 500, 716, -576, 492, -576, 16, 720, -108, 384, 124, 344, 280, 576, -500, 252, 104, -308, 196, -188, -8, 1268, 296, 1032, -1196, 436, 316, 372, -432, -200, -660, 704, -224, 596, -132, 268, 32, -452, 884, 104, -1008, 424, -1348, -280, 4, -1168, 368, 476, 696, 300, -8, 24, 180, -592, -196, 388, 304, 500, 724, -160, 244, -84, 272, -256, -420, 320, 208, -144, -156, 156, 364, 452, 28, 540, 316, 220, -644, -248, 464, 72, 360, 32, -388, 496, -680, -48, 208, -116, -408, 60, -604, -392, 548, -840, 784, -460, 656, -544, -388, -264, 908, -800, -628, -612, -568, 572, -220, 164, 288, -16, -308, 308, -112, -636, -760, 280, -668, 432, 364, 240, -196, 604, 340, 384, 196, 592, -44, -500, 432, -580, -132, 636, -76, 392, 4, -412, 540, 508, 328, -356, -36, 16, -220, -64, -248, -60, 24, -192, 368, 1040, 92, -24, -1044, -32, 40, 104, 148, 192, -136, -520, 56, -816, -224, 732, 392, 356, 212, -80, -424, -1008, -324, 588, -1496, 576, 460, -816, -848, 56, -580, -92, -1372, -112, -496, 200, 364, 52, -140, 48, -48, -60, 84, 72, 40, 132, -356, -268, -104, -284, -404, 732, -520, 164, -304, -540, 120, 328, -76, -460, 756, 388, 588, 236, -436, -72, -176, -404, -316, -148, 716, -604, 404, -72, -88, -888, -68, 944, 88, -220, -344, 960, 472, 460, -232, 704, 120, 832, -228, 692, -508, 132, -476, 844, -748, -364, -44, 1116, -1104, -1056, 76, 428, 552, -692, 60, 356, 96, -384, -188, -612, -576, 736, 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