ref: 8c2a89768692b0b1a7f9a1a0985d99319bd2918d
dir: /src/film_grain_tmpl.c/
/*
* 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 "common/attributes.h"
#include "common/intops.h"
#include "film_grain.h"
#include "tables.h"
#define SUB_GRAIN_WIDTH 44
#define SUB_GRAIN_HEIGHT 38
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;
}
static void generate_grain_y_c(entry buf[][GRAIN_WIDTH],
const Dav1dFilmGrainData *const data
HIGHBD_DECL_SUFFIX)
{
const int bitdepth_min_8 = bitdepth_from_max(bitdepth_max) - 8;
unsigned seed = data->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;
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(dav1d_gaussian_sequence[ value ], shift);
}
}
const int ar_pad = 3;
const int ar_lag = data->ar_coeff_lag;
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;
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];
}
}
const int grain = buf[y][x] + round2(sum, data->ar_coeff_shift);
buf[y][x] = iclip(grain, grain_min, grain_max);
}
}
}
static NOINLINE void
generate_grain_uv_c(entry buf[][GRAIN_WIDTH],
const entry buf_y[][GRAIN_WIDTH],
const Dav1dFilmGrainData *const data, const intptr_t uv,
const int subx, const int suby HIGHBD_DECL_SUFFIX)
{
const int bitdepth_min_8 = bitdepth_from_max(bitdepth_max) - 8;
unsigned seed = data->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;
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(dav1d_gaussian_sequence[ value ], shift);
}
}
const int ar_pad = 3;
const int ar_lag = data->ar_coeff_lag;
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;
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) {
if (!data->num_y_points)
break;
int luma = 0;
const int lumaX = ((x - ar_pad) << subx) + ar_pad;
const int lumaY = ((y - ar_pad) << suby) + ar_pad;
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];
}
}
const int grain = buf[y][x] + round2(sum, data->ar_coeff_shift);
buf[y][x] = iclip(grain, grain_min, grain_max);
}
}
}
#define gnuv_ss_fn(nm, ss_x, ss_y) \
static decl_generate_grain_uv_fn(generate_grain_uv_##nm##_c) { \
generate_grain_uv_c(buf, buf_y, data, uv, ss_x, ss_y HIGHBD_TAIL_SUFFIX); \
}
gnuv_ss_fn(420, 1, 1);
gnuv_ss_fn(422, 1, 0);
gnuv_ss_fn(444, 0, 0);
// samples from the correct block of a grain LUT, while taking into account the
// offsets provided by the offsets cache
static inline entry 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 + (BLOCK_SIZE >> suby) * by]
[offx + x + (BLOCK_SIZE >> subx) * bx];
}
static void fgy_32x32xn_c(pixel *const dst_row, const pixel *const src_row,
const ptrdiff_t stride,
const Dav1dFilmGrainData *const data, const size_t pw,
const uint8_t scaling[SCALING_SIZE],
const entry grain_lut[][GRAIN_WIDTH],
const int bh, const int row_num HIGHBD_DECL_SUFFIX)
{
const int rows = 1 + (data->overlap_flag && row_num > 0);
const int bitdepth_min_8 = bitdepth_from_max(bitdepth_max) - 8;
const int grain_ctr = 128 << bitdepth_min_8;
const int grain_min = -grain_ctr, grain_max = grain_ctr - 1;
int min_value, max_value;
if (data->clip_to_restricted_range) {
min_value = 16 << bitdepth_min_8;
max_value = 235 << bitdepth_min_8;
} else {
min_value = 0;
#if BITDEPTH == 8
max_value = 0xff;
#else
max_value = bitdepth_max;
#endif
}
// seed[0] contains the current row, seed[1] contains the previous
unsigned seed[2];
for (int i = 0; i < rows; i++) {
seed[i] = data->seed;
seed[i] ^= (((row_num - i) * 37 + 178) & 0xFF) << 8;
seed[i] ^= (((row_num - i) * 173 + 105) & 0xFF);
}
assert(stride % (BLOCK_SIZE * sizeof(pixel)) == 0);
int offsets[2 /* col offset */][2 /* row offset */];
// process this row in BLOCK_SIZE^2 blocks
for (unsigned bx = 0; bx < pw; bx += BLOCK_SIZE) {
const int bw = imin(BLOCK_SIZE, (int) pw - bx);
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]);
// x/y block offsets to compensate for overlapped regions
const int ystart = data->overlap_flag && row_num ? imin(2, bh) : 0;
const int xstart = data->overlap_flag && bx ? imin(2, bw) : 0;
static const int w[2][2] = { { 27, 17 }, { 17, 27 } };
#define add_noise_y(x, y, grain) \
const pixel *const src = src_row + (y) * PXSTRIDE(stride) + (x) + bx; \
pixel *const dst = dst_row + (y) * PXSTRIDE(stride) + (x) + bx; \
const int noise = round2(scaling[ *src ] * (grain), data->scaling_shift); \
*dst = iclip(*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 = 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 = sample_lut(grain_lut, offsets, 0, 0, 0, 0, x, y);
int old = sample_lut(grain_lut, offsets, 0, 0, 1, 0, x, y);
grain = round2(old * w[x][0] + grain * w[x][1], 5);
grain = iclip(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 = sample_lut(grain_lut, offsets, 0, 0, 0, 0, x, y);
int old = sample_lut(grain_lut, offsets, 0, 0, 0, 1, x, y);
grain = round2(old * w[y][0] + grain * w[y][1], 5);
grain = iclip(grain, grain_min, grain_max);
add_noise_y(x, y, grain);
}
// Special case for doubly-overlapped corner
for (int x = 0; x < xstart; x++) {
// Blend the top pixel with the top left block
int top = sample_lut(grain_lut, offsets, 0, 0, 0, 1, x, y);
int old = sample_lut(grain_lut, offsets, 0, 0, 1, 1, x, y);
top = round2(old * w[x][0] + top * w[x][1], 5);
top = iclip(top, grain_min, grain_max);
// Blend the current pixel with the left block
int grain = sample_lut(grain_lut, offsets, 0, 0, 0, 0, x, y);
old = sample_lut(grain_lut, offsets, 0, 0, 1, 0, x, y);
grain = round2(old * w[x][0] + grain * w[x][1], 5);
grain = iclip(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 = iclip(grain, grain_min, grain_max);
add_noise_y(x, y, grain);
}
}
}
}
static NOINLINE void
fguv_32x32xn_c(pixel *const dst_row, const pixel *const src_row,
const ptrdiff_t stride, const Dav1dFilmGrainData *const data,
const int 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 HIGHBD_DECL_SUFFIX)
{
const int rows = 1 + (data->overlap_flag && row_num > 0);
const int bitdepth_min_8 = bitdepth_from_max(bitdepth_max) - 8;
const int grain_ctr = 128 << bitdepth_min_8;
const int grain_min = -grain_ctr, grain_max = grain_ctr - 1;
int min_value, max_value;
if (data->clip_to_restricted_range) {
min_value = 16 << bitdepth_min_8;
max_value = (is_id ? 235 : 240) << bitdepth_min_8;
} else {
min_value = 0;
#if BITDEPTH == 8
max_value = 0xff;
#else
max_value = bitdepth_max;
#endif
}
// seed[0] contains the current row, seed[1] contains the previous
unsigned seed[2];
for (int i = 0; i < rows; i++) {
seed[i] = data->seed;
seed[i] ^= (((row_num - i) * 37 + 178) & 0xFF) << 8;
seed[i] ^= (((row_num - i) * 173 + 105) & 0xFF);
}
assert(stride % (BLOCK_SIZE * sizeof(pixel)) == 0);
int offsets[2 /* col offset */][2 /* row offset */];
// process this row in BLOCK_SIZE^2 blocks (subsampled)
for (int bx = 0; bx < pw; bx += BLOCK_SIZE >> sx) {
const int bw = imin(BLOCK_SIZE >> sx, pw - bx);
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]);
// x/y block offsets to compensate for overlapped regions
const int ystart = data->overlap_flag && row_num ? imin(2 >> sy, bh) : 0;
const int xstart = data->overlap_flag && bx ? imin(2 >> sx, bw) : 0;
static const int w[2 /* sub */][2 /* off */][2] = {
{ { 27, 17 }, { 17, 27 } },
{ { 23, 22 } },
};
#define add_noise_uv(x, y, grain) \
const int lx = (bx + x) << sx; \
const int ly = y << sy; \
const pixel *const luma = luma_row + ly * PXSTRIDE(luma_stride) + lx; \
pixel avg = luma[0]; \
if (sx) \
avg = (avg + luma[1] + 1) >> 1; \
const pixel *const src = src_row + (y) * PXSTRIDE(stride) + (bx + (x)); \
pixel *const dst = dst_row + (y) * PXSTRIDE(stride) + (bx + (x)); \
int val = avg; \
if (!data->chroma_scaling_from_luma) { \
const int combined = avg * data->uv_luma_mult[uv] + \
*src * data->uv_mult[uv]; \
val = iclip_pixel( (combined >> 6) + \
(data->uv_offset[uv] * (1 << bitdepth_min_8)) ); \
} \
const int noise = round2(scaling[ val ] * (grain), data->scaling_shift); \
*dst = iclip(*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 = 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 = sample_lut(grain_lut, offsets, sx, sy, 0, 0, x, y);
int old = sample_lut(grain_lut, offsets, sx, sy, 1, 0, x, y);
grain = (old * w[sx][x][0] + grain * w[sx][x][1] + 16) >> 5;
grain = iclip(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 = sample_lut(grain_lut, offsets, sx, sy, 0, 0, x, y);
int old = sample_lut(grain_lut, offsets, sx, sy, 0, 1, x, y);
grain = (old * w[sy][y][0] + grain * w[sy][y][1] + 16) >> 5;
grain = iclip(grain, grain_min, grain_max);
add_noise_uv(x, y, grain);
}
// Special case for doubly-overlapped corner
for (int x = 0; x < xstart; x++) {
// Blend the top pixel with the top left block
int top = sample_lut(grain_lut, offsets, sx, sy, 0, 1, x, y);
int old = sample_lut(grain_lut, offsets, sx, sy, 1, 1, x, y);
top = (old * w[sx][x][0] + top * w[sx][x][1] + 16) >> 5;
top = iclip(top, grain_min, grain_max);
// Blend the current pixel with the left block
int grain = sample_lut(grain_lut, offsets, sx, sy, 0, 0, x, y);
old = sample_lut(grain_lut, offsets, sx, sy, 1, 0, x, y);
grain = (old * w[sx][x][0] + grain * w[sx][x][1] + 16) >> 5;
grain = iclip(grain, grain_min, grain_max);
// Mix the row rows together and apply to image
grain = (top * w[sy][y][0] + grain * w[sy][y][1] + 16) >> 5;
grain = iclip(grain, grain_min, grain_max);
add_noise_uv(x, y, grain);
}
}
}
}
#define fguv_ss_fn(nm, ss_x, ss_y) \
static decl_fguv_32x32xn_fn(fguv_32x32xn_##nm##_c) { \
fguv_32x32xn_c(dst_row, src_row, stride, data, pw, scaling, grain_lut, bh, \
row_num, luma_row, luma_stride, uv_pl, is_id, ss_x, ss_y \
HIGHBD_TAIL_SUFFIX); \
}
fguv_ss_fn(420, 1, 1);
fguv_ss_fn(422, 1, 0);
fguv_ss_fn(444, 0, 0);
COLD void bitfn(dav1d_film_grain_dsp_init)(Dav1dFilmGrainDSPContext *const c) {
c->generate_grain_y = generate_grain_y_c;
c->generate_grain_uv[DAV1D_PIXEL_LAYOUT_I420 - 1] = generate_grain_uv_420_c;
c->generate_grain_uv[DAV1D_PIXEL_LAYOUT_I422 - 1] = generate_grain_uv_422_c;
c->generate_grain_uv[DAV1D_PIXEL_LAYOUT_I444 - 1] = generate_grain_uv_444_c;
c->fgy_32x32xn = fgy_32x32xn_c;
c->fguv_32x32xn[DAV1D_PIXEL_LAYOUT_I420 - 1] = fguv_32x32xn_420_c;
c->fguv_32x32xn[DAV1D_PIXEL_LAYOUT_I422 - 1] = fguv_32x32xn_422_c;
c->fguv_32x32xn[DAV1D_PIXEL_LAYOUT_I444 - 1] = fguv_32x32xn_444_c;
#if HAVE_ASM && ARCH_X86
bitfn(dav1d_film_grain_dsp_init_x86)(c);
#endif
}