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ffmpeg/libavcodec/aom_film_grain_template.c

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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
*/
/*
* Copyright © 2018, Niklas Haas
* Copyright © 2018, VideoLAN and dav1d authors
* Copyright © 2018, Two Orioles, LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "bit_depth_template.c"
#undef entry
#undef bitdepth
#undef bitdepth_max
#undef HBD_DECL
#undef HBD_CALL
#undef SCALING_SIZE
#if BIT_DEPTH > 8
# define entry int16_t
# define bitdepth_max ((1 << bitdepth) - 1)
# define HBD_DECL , const int bitdepth
# define HBD_CALL , bitdepth
# define SCALING_SIZE 4096
#else
# define entry int8_t
# define bitdepth 8
# define bitdepth_max UINT8_MAX
# define HBD_DECL
# define HBD_CALL
# define SCALING_SIZE 256
#endif
static void FUNC(generate_grain_y_c)(entry buf[][GRAIN_WIDTH],
const AVFilmGrainParams *const params
HBD_DECL)
{
const AVFilmGrainAOMParams *const data = &params->codec.aom;
const int bitdepth_min_8 = bitdepth - 8;
unsigned seed = params->seed;
const int shift = 4 - bitdepth_min_8 + data->grain_scale_shift;
const int grain_ctr = 128 << bitdepth_min_8;
const int grain_min = -grain_ctr, grain_max = grain_ctr - 1;
const int ar_pad = 3;
const int ar_lag = data->ar_coeff_lag;
for (int y = 0; y < GRAIN_HEIGHT; y++) {
for (int x = 0; x < GRAIN_WIDTH; x++) {
const int value = get_random_number(11, &seed);
buf[y][x] = round2(gaussian_sequence[ value ], shift);
}
}
for (int y = ar_pad; y < GRAIN_HEIGHT; y++) {
for (int x = ar_pad; x < GRAIN_WIDTH - ar_pad; x++) {
const int8_t *coeff = data->ar_coeffs_y;
int sum = 0, grain;
for (int dy = -ar_lag; dy <= 0; dy++) {
for (int dx = -ar_lag; dx <= ar_lag; dx++) {
if (!dx && !dy)
break;
sum += *(coeff++) * buf[y + dy][x + dx];
}
}
grain = buf[y][x] + round2(sum, data->ar_coeff_shift);
buf[y][x] = av_clip(grain, grain_min, grain_max);
}
}
}
static void
FUNC(generate_grain_uv_c)(entry buf[][GRAIN_WIDTH],
const entry buf_y[][GRAIN_WIDTH],
const AVFilmGrainParams *const params, const intptr_t uv,
const int subx, const int suby HBD_DECL)
{
const AVFilmGrainAOMParams *const data = &params->codec.aom;
const int bitdepth_min_8 = bitdepth - 8;
unsigned seed = params->seed ^ (uv ? 0x49d8 : 0xb524);
const int shift = 4 - bitdepth_min_8 + data->grain_scale_shift;
const int grain_ctr = 128 << bitdepth_min_8;
const int grain_min = -grain_ctr, grain_max = grain_ctr - 1;
const int chromaW = subx ? SUB_GRAIN_WIDTH : GRAIN_WIDTH;
const int chromaH = suby ? SUB_GRAIN_HEIGHT : GRAIN_HEIGHT;
const int ar_pad = 3;
const int ar_lag = data->ar_coeff_lag;
for (int y = 0; y < chromaH; y++) {
for (int x = 0; x < chromaW; x++) {
const int value = get_random_number(11, &seed);
buf[y][x] = round2(gaussian_sequence[ value ], shift);
}
}
for (int y = ar_pad; y < chromaH; y++) {
for (int x = ar_pad; x < chromaW - ar_pad; x++) {
const int8_t *coeff = data->ar_coeffs_uv[uv];
int sum = 0, grain;
for (int dy = -ar_lag; dy <= 0; dy++) {
for (int dx = -ar_lag; dx <= ar_lag; dx++) {
// For the final (current) pixel, we need to add in the
// contribution from the luma grain texture
if (!dx && !dy) {
const int lumaX = ((x - ar_pad) << subx) + ar_pad;
const int lumaY = ((y - ar_pad) << suby) + ar_pad;
int luma = 0;
if (!data->num_y_points)
break;
for (int i = 0; i <= suby; i++) {
for (int j = 0; j <= subx; j++) {
luma += buf_y[lumaY + i][lumaX + j];
}
}
luma = round2(luma, subx + suby);
sum += luma * (*coeff);
break;
}
sum += *(coeff++) * buf[y + dy][x + dx];
}
}
grain = buf[y][x] + round2(sum, data->ar_coeff_shift);
buf[y][x] = av_clip(grain, grain_min, grain_max);
}
}
}
// samples from the correct block of a grain LUT, while taking into account the
// offsets provided by the offsets cache
static inline entry FUNC(sample_lut)(const entry grain_lut[][GRAIN_WIDTH],
const int offsets[2][2],
const int subx, const int suby,
const int bx, const int by,
const int x, const int y)
{
const int randval = offsets[bx][by];
const int offx = 3 + (2 >> subx) * (3 + (randval >> 4));
const int offy = 3 + (2 >> suby) * (3 + (randval & 0xF));
return grain_lut[offy + y + (FG_BLOCK_SIZE >> suby) * by]
[offx + x + (FG_BLOCK_SIZE >> subx) * bx];
}
static void FUNC(fgy_32x32xn_c)(pixel *const dst_row, const pixel *const src_row,
const ptrdiff_t stride,
const AVFilmGrainParams *const params, const size_t pw,
const uint8_t scaling[SCALING_SIZE],
const entry grain_lut[][GRAIN_WIDTH],
const int bh, const int row_num HBD_DECL)
{
const AVFilmGrainAOMParams *const data = &params->codec.aom;
const int rows = 1 + (data->overlap_flag && row_num > 0);
const int bitdepth_min_8 = bitdepth - 8;
const int grain_ctr = 128 << bitdepth_min_8;
const int grain_min = -grain_ctr, grain_max = grain_ctr - 1;
unsigned seed[2];
int offsets[2 /* col offset */][2 /* row offset */];
int min_value, max_value;
if (data->limit_output_range) {
min_value = 16 << bitdepth_min_8;
max_value = 235 << bitdepth_min_8;
} else {
min_value = 0;
max_value = bitdepth_max;
}
// seed[0] contains the current row, seed[1] contains the previous
for (int i = 0; i < rows; i++) {
seed[i] = params->seed;
seed[i] ^= (((row_num - i) * 37 + 178) & 0xFF) << 8;
seed[i] ^= (((row_num - i) * 173 + 105) & 0xFF);
}
av_assert1(stride % (FG_BLOCK_SIZE * sizeof(pixel)) == 0);
// process this row in FG_BLOCK_SIZE^2 blocks
for (unsigned bx = 0; bx < pw; bx += FG_BLOCK_SIZE) {
const int bw = FFMIN(FG_BLOCK_SIZE, (int) pw - bx);
const pixel *src;
pixel *dst;
int noise;
// x/y block offsets to compensate for overlapped regions
const int ystart = data->overlap_flag && row_num ? FFMIN(2, bh) : 0;
const int xstart = data->overlap_flag && bx ? FFMIN(2, bw) : 0;
static const int w[2][2] = { { 27, 17 }, { 17, 27 } };
if (data->overlap_flag && bx) {
// shift previous offsets left
for (int i = 0; i < rows; i++)
offsets[1][i] = offsets[0][i];
}
// update current offsets
for (int i = 0; i < rows; i++)
offsets[0][i] = get_random_number(8, &seed[i]);
#define add_noise_y(x, y, grain) \
src = (const pixel*)((const char*)src_row + (y) * stride) + (x) + bx; \
dst = (pixel*)((char*)dst_row + (y) * stride) + (x) + bx; \
noise = round2(scaling[ *src ] * (grain), data->scaling_shift); \
*dst = av_clip(*src + noise, min_value, max_value);
for (int y = ystart; y < bh; y++) {
// Non-overlapped image region (straightforward)
for (int x = xstart; x < bw; x++) {
int grain = FUNC(sample_lut)(grain_lut, offsets, 0, 0, 0, 0, x, y);
add_noise_y(x, y, grain);
}
// Special case for overlapped column
for (int x = 0; x < xstart; x++) {
int grain = FUNC(sample_lut)(grain_lut, offsets, 0, 0, 0, 0, x, y);
int old = FUNC(sample_lut)(grain_lut, offsets, 0, 0, 1, 0, x, y);
grain = round2(old * w[x][0] + grain * w[x][1], 5);
grain = av_clip(grain, grain_min, grain_max);
add_noise_y(x, y, grain);
}
}
for (int y = 0; y < ystart; y++) {
// Special case for overlapped row (sans corner)
for (int x = xstart; x < bw; x++) {
int grain = FUNC(sample_lut)(grain_lut, offsets, 0, 0, 0, 0, x, y);
int old = FUNC(sample_lut)(grain_lut, offsets, 0, 0, 0, 1, x, y);
grain = round2(old * w[y][0] + grain * w[y][1], 5);
grain = av_clip(grain, grain_min, grain_max);
add_noise_y(x, y, grain);
}
// Special case for doubly-overlapped corner
for (int x = 0; x < xstart; x++) {
int grain = FUNC(sample_lut)(grain_lut, offsets, 0, 0, 0, 0, x, y);
int top = FUNC(sample_lut)(grain_lut, offsets, 0, 0, 0, 1, x, y);
int old = FUNC(sample_lut)(grain_lut, offsets, 0, 0, 1, 1, x, y);
// Blend the top pixel with the top left block
top = round2(old * w[x][0] + top * w[x][1], 5);
top = av_clip(top, grain_min, grain_max);
// Blend the current pixel with the left block
old = FUNC(sample_lut)(grain_lut, offsets, 0, 0, 1, 0, x, y);
grain = round2(old * w[x][0] + grain * w[x][1], 5);
grain = av_clip(grain, grain_min, grain_max);
// Mix the row rows together and apply grain
grain = round2(top * w[y][0] + grain * w[y][1], 5);
grain = av_clip(grain, grain_min, grain_max);
add_noise_y(x, y, grain);
}
}
}
}
static void
FUNC(fguv_32x32xn_c)(pixel *const dst_row, const pixel *const src_row,
const ptrdiff_t stride, const AVFilmGrainParams *const params,
const size_t pw, const uint8_t scaling[SCALING_SIZE],
const entry grain_lut[][GRAIN_WIDTH], const int bh,
const int row_num, const pixel *const luma_row,
const ptrdiff_t luma_stride, const int uv, const int is_id,
const int sx, const int sy HBD_DECL)
{
const AVFilmGrainAOMParams *const data = &params->codec.aom;
const int rows = 1 + (data->overlap_flag && row_num > 0);
const int bitdepth_min_8 = bitdepth - 8;
const int grain_ctr = 128 << bitdepth_min_8;
const int grain_min = -grain_ctr, grain_max = grain_ctr - 1;
unsigned seed[2];
int offsets[2 /* col offset */][2 /* row offset */];
int min_value, max_value;
if (data->limit_output_range) {
min_value = 16 << bitdepth_min_8;
max_value = (is_id ? 235 : 240) << bitdepth_min_8;
} else {
min_value = 0;
max_value = bitdepth_max;
}
// seed[0] contains the current row, seed[1] contains the previous
for (int i = 0; i < rows; i++) {
seed[i] = params->seed;
seed[i] ^= (((row_num - i) * 37 + 178) & 0xFF) << 8;
seed[i] ^= (((row_num - i) * 173 + 105) & 0xFF);
}
av_assert1(stride % (FG_BLOCK_SIZE * sizeof(pixel)) == 0);
// process this row in FG_BLOCK_SIZE^2 blocks (subsampled)
for (unsigned bx = 0; bx < pw; bx += FG_BLOCK_SIZE >> sx) {
const int bw = FFMIN(FG_BLOCK_SIZE >> sx, (int)(pw - bx));
int val, lx, ly, noise;
const pixel *src, *luma;
pixel *dst, avg;
// x/y block offsets to compensate for overlapped regions
const int ystart = data->overlap_flag && row_num ? FFMIN(2 >> sy, bh) : 0;
const int xstart = data->overlap_flag && bx ? FFMIN(2 >> sx, bw) : 0;
static const int w[2 /* sub */][2 /* off */][2] = {
{ { 27, 17 }, { 17, 27 } },
{ { 23, 22 } },
};
if (data->overlap_flag && bx) {
// shift previous offsets left
for (int i = 0; i < rows; i++)
offsets[1][i] = offsets[0][i];
}
// update current offsets
for (int i = 0; i < rows; i++)
offsets[0][i] = get_random_number(8, &seed[i]);
#define add_noise_uv(x, y, grain) \
lx = (bx + x) << sx; \
ly = y << sy; \
luma = (const pixel*)((const char*)luma_row + ly * luma_stride) + lx;\
avg = luma[0]; \
if (sx) \
avg = (avg + luma[1] + 1) >> 1; \
src = (const pixel*)((const char *)src_row + (y) * stride) + bx + (x);\
dst = (pixel *) ((char *) dst_row + (y) * stride) + bx + (x); \
val = avg; \
if (!data->chroma_scaling_from_luma) { \
const int combined = avg * data->uv_mult_luma[uv] + \
*src * data->uv_mult[uv]; \
val = av_clip( (combined >> 6) + \
(data->uv_offset[uv] * (1 << bitdepth_min_8)), \
0, bitdepth_max ); \
} \
noise = round2(scaling[ val ] * (grain), data->scaling_shift); \
*dst = av_clip(*src + noise, min_value, max_value);
for (int y = ystart; y < bh; y++) {
// Non-overlapped image region (straightforward)
for (int x = xstart; x < bw; x++) {
int grain = FUNC(sample_lut)(grain_lut, offsets, sx, sy, 0, 0, x, y);
add_noise_uv(x, y, grain);
}
// Special case for overlapped column
for (int x = 0; x < xstart; x++) {
int grain = FUNC(sample_lut)(grain_lut, offsets, sx, sy, 0, 0, x, y);
int old = FUNC(sample_lut)(grain_lut, offsets, sx, sy, 1, 0, x, y);
grain = round2(old * w[sx][x][0] + grain * w[sx][x][1], 5);
grain = av_clip(grain, grain_min, grain_max);
add_noise_uv(x, y, grain);
}
}
for (int y = 0; y < ystart; y++) {
// Special case for overlapped row (sans corner)
for (int x = xstart; x < bw; x++) {
int grain = FUNC(sample_lut)(grain_lut, offsets, sx, sy, 0, 0, x, y);
int old = FUNC(sample_lut)(grain_lut, offsets, sx, sy, 0, 1, x, y);
grain = round2(old * w[sy][y][0] + grain * w[sy][y][1], 5);
grain = av_clip(grain, grain_min, grain_max);
add_noise_uv(x, y, grain);
}
// Special case for doubly-overlapped corner
for (int x = 0; x < xstart; x++) {
int top = FUNC(sample_lut)(grain_lut, offsets, sx, sy, 0, 1, x, y);
int old = FUNC(sample_lut)(grain_lut, offsets, sx, sy, 1, 1, x, y);
int grain = FUNC(sample_lut)(grain_lut, offsets, sx, sy, 0, 0, x, y);
// Blend the top pixel with the top left block
top = round2(old * w[sx][x][0] + top * w[sx][x][1], 5);
top = av_clip(top, grain_min, grain_max);
// Blend the current pixel with the left block
old = FUNC(sample_lut)(grain_lut, offsets, sx, sy, 1, 0, x, y);
grain = round2(old * w[sx][x][0] + grain * w[sx][x][1], 5);
grain = av_clip(grain, grain_min, grain_max);
// Mix the row rows together and apply to image
grain = round2(top * w[sy][y][0] + grain * w[sy][y][1], 5);
grain = av_clip(grain, grain_min, grain_max);
add_noise_uv(x, y, grain);
}
}
}
}
static void FUNC(generate_scaling)(const uint8_t points[][2], const int num,
uint8_t scaling[SCALING_SIZE] HBD_DECL)
{
const int shift_x = bitdepth - 8;
const int scaling_size = 1 << bitdepth;
const int max_value = points[num - 1][0] << shift_x;
av_assert0(scaling_size <= SCALING_SIZE);
if (num == 0) {
memset(scaling, 0, scaling_size);
return;
}
// Fill up the preceding entries with the initial value
memset(scaling, points[0][1], points[0][0] << shift_x);
// Linearly interpolate the values in the middle
for (int i = 0; i < num - 1; i++) {
const int bx = points[i][0];
const int by = points[i][1];
const int ex = points[i+1][0];
const int ey = points[i+1][1];
const int dx = ex - bx;
const int dy = ey - by;
const int delta = dy * ((0x10000 + (dx >> 1)) / dx);
av_assert1(dx > 0);
for (int x = 0, d = 0x8000; x < dx; x++) {
scaling[(bx + x) << shift_x] = by + (d >> 16);
d += delta;
}
}
// Fill up the remaining entries with the final value
memset(&scaling[max_value], points[num - 1][1], scaling_size - max_value);
#if BIT_DEPTH != 8
for (int i = 0; i < num - 1; i++) {
const int pad = 1 << shift_x, rnd = pad >> 1;
const int bx = points[i][0] << shift_x;
const int ex = points[i+1][0] << shift_x;
const int dx = ex - bx;
for (int x = 0; x < dx; x += pad) {
const int range = scaling[bx + x + pad] - scaling[bx + x];
for (int n = 1, r = rnd; n < pad; n++) {
r += range;
scaling[bx + x + n] = scaling[bx + x] + (r >> shift_x);
}
}
}
#endif
}
static av_always_inline void
FUNC(apply_grain_row)(AVFrame *out, const AVFrame *in,
const int ss_x, const int ss_y,
const uint8_t scaling[3][SCALING_SIZE],
const entry grain_lut[3][GRAIN_HEIGHT+1][GRAIN_WIDTH],
const AVFilmGrainParams *params,
const int row HBD_DECL)
{
// Synthesize grain for the affected planes
const AVFilmGrainAOMParams *const data = &params->codec.aom;
const int cpw = (out->width + ss_x) >> ss_x;
const int is_id = out->colorspace == AVCOL_SPC_RGB;
const int bh = (FFMIN(out->height - row * FG_BLOCK_SIZE, FG_BLOCK_SIZE) + ss_y) >> ss_y;
const ptrdiff_t uv_off = row * FG_BLOCK_SIZE * out->linesize[1] >> ss_y;
pixel *const luma_src = (pixel *)
((char *) in->data[0] + row * FG_BLOCK_SIZE * in->linesize[0]);
if (data->num_y_points) {
const int bh = FFMIN(out->height - row * FG_BLOCK_SIZE, FG_BLOCK_SIZE);
const ptrdiff_t off = row * FG_BLOCK_SIZE * out->linesize[0];
FUNC(fgy_32x32xn_c)((pixel *) ((char *) out->data[0] + off), luma_src,
out->linesize[0], params, out->width, scaling[0],
grain_lut[0], bh, row HBD_CALL);
}
if (!data->num_uv_points[0] && !data->num_uv_points[1] &&
!data->chroma_scaling_from_luma)
{
return;
}
// extend padding pixels
if (out->width & ss_x) {
pixel *ptr = luma_src;
for (int y = 0; y < bh; y++) {
ptr[out->width] = ptr[out->width - 1];
ptr = (pixel *) ((char *) ptr + (in->linesize[0] << ss_y));
}
}
if (data->chroma_scaling_from_luma) {
for (int pl = 0; pl < 2; pl++)
FUNC(fguv_32x32xn_c)((pixel *) ((char *) out->data[1 + pl] + uv_off),
(const pixel *) ((const char *) in->data[1 + pl] + uv_off),
in->linesize[1], params, cpw, scaling[0],
grain_lut[1 + pl], bh, row, luma_src,
in->linesize[0], pl, is_id, ss_x, ss_y HBD_CALL);
} else {
for (int pl = 0; pl < 2; pl++) {
if (data->num_uv_points[pl]) {
FUNC(fguv_32x32xn_c)((pixel *) ((char *) out->data[1 + pl] + uv_off),
(const pixel *) ((const char *) in->data[1 + pl] + uv_off),
in->linesize[1], params, cpw, scaling[1 + pl],
grain_lut[1 + pl], bh, row, luma_src,
in->linesize[0], pl, is_id, ss_x, ss_y HBD_CALL);
}
}
}
}
static int FUNC(apply_film_grain)(AVFrame *out_frame, const AVFrame *in_frame,
const AVFilmGrainParams *params HBD_DECL)
{
entry grain_lut[3][GRAIN_HEIGHT + 1][GRAIN_WIDTH];
uint8_t scaling[3][SCALING_SIZE];
const AVFilmGrainAOMParams *const data = &params->codec.aom;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(out_frame->format);
const int rows = AV_CEIL_RSHIFT(out_frame->height, 5); /* log2(FG_BLOCK_SIZE) */
const int subx = desc->log2_chroma_w, suby = desc->log2_chroma_h;
// Generate grain LUTs as needed
FUNC(generate_grain_y_c)(grain_lut[0], params HBD_CALL);
if (data->num_uv_points[0] || data->chroma_scaling_from_luma)
FUNC(generate_grain_uv_c)(grain_lut[1], grain_lut[0], params, 0, subx, suby HBD_CALL);
if (data->num_uv_points[1] || data->chroma_scaling_from_luma)
FUNC(generate_grain_uv_c)(grain_lut[2], grain_lut[0], params, 1, subx, suby HBD_CALL);
// Generate scaling LUTs as needed
if (data->num_y_points || data->chroma_scaling_from_luma)
FUNC(generate_scaling)(data->y_points, data->num_y_points, scaling[0] HBD_CALL);
if (data->num_uv_points[0])
FUNC(generate_scaling)(data->uv_points[0], data->num_uv_points[0], scaling[1] HBD_CALL);
if (data->num_uv_points[1])
FUNC(generate_scaling)(data->uv_points[1], data->num_uv_points[1], scaling[2] HBD_CALL);
for (int row = 0; row < rows; row++) {
FUNC(apply_grain_row)(out_frame, in_frame, subx, suby, scaling, grain_lut,
params, row HBD_CALL);
}
return 0;
}
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