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/*
* Copyright (c) 2021, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 3-Clause Clear License
* and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
* License was not distributed with this source code in the LICENSE file, you
* can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. If the
* Alliance for Open Media Patent License 1.0 was not distributed with this
* source code in the PATENTS file, you can obtain it at
* aomedia.org/license/patent-license/.
*/
#include <stdlib.h>
#include "config/aom_config.h"
#include "config/aom_dsp_rtcd.h"
#include "aom_dsp/aom_dsp_common.h"
#include "aom_ports/mem.h"
#define DF_SPARSE 1
#define DF_FILT26 1
#define DF_8_THRESH 3
#define DF_6_THRESH 4
#define FILT_8_THRESH_SHIFT 3
#define DF_SHORT_DEC 1
#define EDGE_DECISION 0
#define MAX_DBL_FLT_LEN 12
#define DF_SHIFT 8
static const int w_mult[MAX_DBL_FLT_LEN] = { 85, 51, 37, 28, 23, 20,
17, 15, 13, 12, 11, 10 };
static const int q_thresh_mults[MAX_DBL_FLT_LEN] = { 32, 25, 19, 19, 18, 18,
17, 17, 17, 16, 16, 16 };
static INLINE void filt_generic_highbd(int q_threshold, int width, uint16_t *s,
const int pitch, int bd) {
if (width < 1) return;
int delta_m2 = (3 * (s[0] - s[-1 * pitch]) - (s[pitch] - s[-2 * pitch])) * 4;
int q_thresh_clamp = q_threshold * q_thresh_mults[width - 1];
delta_m2 = clamp(delta_m2, -q_thresh_clamp, q_thresh_clamp);
delta_m2 *= w_mult[width - 1];
for (int i = 0; i < width; i++) {
s[(-i - 1) * pitch] = clip_pixel_highbd(
s[(-i - 1) * pitch] +
ROUND_POWER_OF_TWO(delta_m2 * (width - i), 3 + DF_SHIFT),
bd);
s[i * pitch] = clip_pixel_highbd(
s[i * pitch] - ROUND_POWER_OF_TWO(delta_m2 * (width - i), 3 + DF_SHIFT),
bd);
}
}
#define DBL_CUSTOM_DECIS 3
#define DBL_REG_DECIS_LEN MAX_DBL_FLT_LEN - DBL_CUSTOM_DECIS
#define DF_SIDE_SUM_SHIFT 5
int side_sum[DBL_REG_DECIS_LEN] = { 5, 6, 6, 6, 5, 5, 6, 6, 6 };
#define DF_SIDE_FIRST_SHIFT 6
int side_first[DBL_REG_DECIS_LEN] = { 7, 7, 6, 5, 4, 4, 4, 4, 4 };
#define DF_Q_THRESH_SHIFT 4
int q_first[DBL_REG_DECIS_LEN] = { 45, 43, 40, 35, 32, 32, 32, 32, 32 };
#if DF_FILT26
#define SEC_DERIV_ARRAY_LEN (MAX_DBL_FLT_LEN + 1) * 2
#else
#define SEC_DERIV_ARRAY_LEN 14
#endif // DF_FILT26
// Determining number of samples to be modified for the current row/column
static INLINE int filt_choice_highbd(uint16_t *s, int pitch, int max_filt,
uint16_t q_thresh, uint16_t side_thresh) {
if (!q_thresh || !side_thresh) return 0;
int max_samples = max_filt / 2 - 1;
if (max_samples < 1) return 0;
int16_t second_derivs_buf[SEC_DERIV_ARRAY_LEN];
int16_t *second_deriv = &second_derivs_buf[(SEC_DERIV_ARRAY_LEN >> 1)];
int8_t mask = 0;
// Testing for 1 sample modification
//-----------------------------------------------
second_deriv[-2] = abs(s[-3 * pitch] - (s[-2 * pitch] << 1) + s[-pitch]);
second_deriv[1] = abs(s[0] - (s[pitch] << 1) + s[2 * pitch]);
mask |= (second_deriv[-2] > side_thresh) * -1;
mask |= (second_deriv[1] > side_thresh) * -1;
if (mask) return 0;
if (max_samples == 1) return 1;
// Testing for 2 sample modification
//-----------------------------------------------
const int side_thresh2 = side_thresh >> 2;
mask |= (second_deriv[-2] > side_thresh2) * -1;
mask |= (second_deriv[1] > side_thresh2) * -1;
second_deriv[-1] = abs(s[-2 * pitch] - (s[-pitch] << 1) + s[0]);
second_deriv[0] = abs(s[-1 * pitch] - (s[0] << 1) + s[pitch]);
mask |= ((second_deriv[-1] + second_deriv[0]) > q_thresh * DF_6_THRESH) * -1;
if (mask) return 1;
if (max_samples == 2) return 2;
// Testing 3 sample modification
//-----------------------------------------------
const int side_thresh3 = side_thresh >> FILT_8_THRESH_SHIFT;
mask |= (second_deriv[-2] > side_thresh3) * -1;
mask |= (second_deriv[1] > side_thresh3) * -1;
#if !DF_SHORT_DEC
second_deriv[-3] = abs(s[-4 * pitch] - (s[-3 * pitch] << 1) + s[-2 * pitch]);
second_deriv[2] = abs(s[pitch] - (s[2 * pitch] << 1) + s[3 * pitch]);
mask |= (second_deriv[-3] > side_thresh3) * -1;
mask |= (second_deriv[2] > side_thresh3) * -1;
#endif //! DF_SHORT_DEC
mask |= ((second_deriv[-1] + second_deriv[0]) > q_thresh * DF_8_THRESH) * -1;
int end_dir_thresh = (side_thresh * 3) >> 4;
mask |= (abs((s[-1 * pitch] - s[(-3 - 1) * pitch]) -
3 * (s[-1 * pitch] - s[-2 * pitch])) > end_dir_thresh) *
-1;
mask |= (abs((s[0] - s[3 * pitch]) - 3 * (s[0] - s[1 * pitch])) >
end_dir_thresh) *
-1;
if (mask) return 2;
if (max_samples == 3) return 3;
// Testing 4 sample modification and above
//-----------------------------------------------
#if !DF_SHORT_DEC
#if DF_SPARSE
int p_deriv_sum = 0;
int q_deriv_sum = 0;
#else
int p_deriv_sum = second_deriv[-3] << DF_SIDE_SUM_SHIFT;
int q_deriv_sum = second_deriv[2] << DF_SIDE_SUM_SHIFT;
#endif // DF_SPARSE
#endif // !DF_SHORT_DEC
int p_first_deriv_scaled = second_deriv[-2] << DF_SIDE_FIRST_SHIFT;
int q_first_deriv_scaled = second_deriv[1] << DF_SIDE_FIRST_SHIFT;
int transition = (second_deriv[-1] + second_deriv[0]) << DF_Q_THRESH_SHIFT;
#if DF_SPARSE
for (int dist = 4; dist < MAX_DBL_FLT_LEN + 1; dist += 2) {
#if !DF_SHORT_DEC
second_deriv[-(dist - 1)] =
abs(s[-(dist)*pitch] - (s[-(dist - 1) * pitch] << 1) +
s[-(dist - 2) * pitch]);
second_deriv[dist - 2] =
abs(s[(dist - 3) * pitch] - (s[(dist - 2) * pitch] << 1) +
s[(dist - 1) * pitch]);
p_deriv_sum += (second_deriv[-(dist - 1)] << DF_SIDE_SUM_SHIFT);
q_deriv_sum += (second_deriv[dist - 2] << DF_SIDE_SUM_SHIFT);
#endif // !DF_SHORT_DEC
#else
for (int dist = 4; dist < MAX_DBL_FLT_LEN + 1; ++dist) {
#endif // DF_SPARSE
second_deriv[-dist] = abs(s[(-dist - 1) * pitch] - (s[-dist * pitch] << 1) +
s[(-dist + 1) * pitch]);
second_deriv[dist - 1] = abs(
s[(dist - 2) * pitch] - (s[(dist - 1) * pitch] << 1) + s[dist * pitch]);
#if !DF_SHORT_DEC
p_deriv_sum += (second_deriv[-dist] << DF_SIDE_SUM_SHIFT);
q_deriv_sum += (second_deriv[dist - 1] << DF_SIDE_SUM_SHIFT);
const int sum_side_thresh4 = side_thresh * side_sum[dist - 4];
#endif
int side_thresh4 = side_thresh * side_first[dist - 4];
const int q_thresh4 = q_thresh * q_first[dist - 4];
#if !DF_SHORT_DEC
mask |= (p_deriv_sum > sum_side_thresh4) * -1;
mask |= (q_deriv_sum > sum_side_thresh4) * -1;
#endif
mask |= (p_first_deriv_scaled > side_thresh4) * -1;
mask |= (q_first_deriv_scaled > side_thresh4) * -1;
mask |= (transition > q_thresh4) * -1;
end_dir_thresh = (side_thresh * dist) >> 4;
mask |= (abs((s[-1 * pitch] - s[(-dist - 1) * pitch]) -
dist * (s[-1 * pitch] - s[-2 * pitch])) > end_dir_thresh) *
-1;
mask |= (abs((s[0] - s[dist * pitch]) - dist * (s[0] - s[1 * pitch])) >
end_dir_thresh) *
-1;
#if DF_SPARSE
if (mask) return dist - 2;
if (max_samples <= dist) return ((dist >> 1) << 1);
#else
if (mask) return dist - 1;
if (max_samples == dist) return dist;
#endif // DF_SPARSE
}
return MAX_DBL_FLT_LEN;
}
void aom_highbd_lpf_horizontal_generic_c(uint16_t *s, int pitch, int filt_width,
const uint16_t *q_thresh,
const uint16_t *side_thresh, int bd) {
int i;
int count = 4;
#if EDGE_DECISION
const int filter0 =
filt_choice_highbd(s, pitch, filt_width, *q_thresh, *side_thresh);
s += count - 1;
const int filter3 =
filt_choice_highbd(s, pitch, filt_width, *q_thresh, *side_thresh);
s -= count - 1;
int filter = AOMMIN(filter0, filter3);
#endif // EDGE_DECISION
// loop filter designed to work using chars so that we can make maximum use
// of 8 bit simd instructions.
for (i = 0; i < count; ++i) {
#if !EDGE_DECISION
int filter =
filt_choice_highbd(s, pitch, filt_width, *q_thresh, *side_thresh);
#endif
filt_generic_highbd(*q_thresh, filter, s, pitch, bd);
++s;
}
}
void aom_highbd_lpf_vertical_generic_c(uint16_t *s, int pitch, int filt_width,
const uint16_t *q_thresh,
const uint16_t *side_thresh, int bd) {
int i;
int count = 4;
#if EDGE_DECISION
const int filter0 =
filt_choice_highbd(s, 1, filt_width, *q_thresh, *side_thresh);
const int filter3 = filt_choice_highbd(s + (count - 1) * pitch, 1, filt_width,
*q_thresh, *side_thresh);
int filter = AOMMIN(filter0, filter3);
#endif // EDGE_DECISION
// loop filter designed to work using chars so that we can make maximum use
// of 8 bit simd instructions.
for (i = 0; i < count; ++i) {
#if !EDGE_DECISION
int filter = filt_choice_highbd(s, 1, filt_width, *q_thresh, *side_thresh);
#endif
filt_generic_highbd(*q_thresh, filter, s, 1, bd);
s += pitch;
}
}