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|
/*
* AOM film grain synthesis
* Copyright (c) 2023 Niklas Haas <ffmpeg@haasn.xyz>
*
* 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 <ffmpeg@haasn.xyz>
*/
#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++) {
if (!s->sets[i])
continue;
if (!av_frame_side_data_add(&frame->side_data, &frame->nb_side_data,
AV_FRAME_DATA_FILM_GRAIN_PARAMS,
(AVBufferRef**)&s->sets[i],
AV_FRAME_SIDE_DATA_FLAG_NEW_REF))
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,
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};
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