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/*
* Copyright (c) 2019, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. 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 www.aomedia.org/license/patent.
*/
#include <assert.h>
#include <immintrin.h>
#include "config/av1_rtcd.h"
#include "av1/encoder/encoder.h"
#include "av1/encoder/temporal_filter.h"
#define SSE_STRIDE (BW + 2)
DECLARE_ALIGNED(32, static const uint32_t, sse_bytemask[4][8]) = {
{ 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0, 0, 0 },
{ 0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0, 0 },
{ 0, 0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0 },
{ 0, 0, 0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }
};
DECLARE_ALIGNED(32, static const uint8_t, shufflemask_16b[2][16]) = {
{ 0, 1, 0, 1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 },
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 10, 11, 10, 11 }
};
static AOM_FORCE_INLINE void get_squared_error_16x16_avx2(
const uint8_t *frame1, const unsigned int stride, const uint8_t *frame2,
const unsigned int stride2, const int block_width, const int block_height,
uint16_t *frame_sse, const unsigned int sse_stride) {
(void)block_width;
const uint8_t *src1 = frame1;
const uint8_t *src2 = frame2;
uint16_t *dst = frame_sse;
for (int i = 0; i < block_height; i++) {
__m128i vf1_128, vf2_128;
__m256i vf1, vf2, vdiff1, vsqdiff1;
vf1_128 = _mm_loadu_si128((__m128i *)(src1));
vf2_128 = _mm_loadu_si128((__m128i *)(src2));
vf1 = _mm256_cvtepu8_epi16(vf1_128);
vf2 = _mm256_cvtepu8_epi16(vf2_128);
vdiff1 = _mm256_sub_epi16(vf1, vf2);
vsqdiff1 = _mm256_mullo_epi16(vdiff1, vdiff1);
_mm256_storeu_si256((__m256i *)(dst), vsqdiff1);
// Set zero to uninitialized memory to avoid uninitialized loads later
*(uint32_t *)(dst + 16) = _mm_cvtsi128_si32(_mm_setzero_si128());
src1 += stride, src2 += stride2;
dst += sse_stride;
}
}
static AOM_FORCE_INLINE void get_squared_error_32x32_avx2(
const uint8_t *frame1, const unsigned int stride, const uint8_t *frame2,
const unsigned int stride2, const int block_width, const int block_height,
uint16_t *frame_sse, const unsigned int sse_stride) {
(void)block_width;
const uint8_t *src1 = frame1;
const uint8_t *src2 = frame2;
uint16_t *dst = frame_sse;
for (int i = 0; i < block_height; i++) {
__m256i vsrc1, vsrc2, vmin, vmax, vdiff, vdiff1, vdiff2, vres1, vres2;
vsrc1 = _mm256_loadu_si256((__m256i *)src1);
vsrc2 = _mm256_loadu_si256((__m256i *)src2);
vmax = _mm256_max_epu8(vsrc1, vsrc2);
vmin = _mm256_min_epu8(vsrc1, vsrc2);
vdiff = _mm256_subs_epu8(vmax, vmin);
__m128i vtmp1 = _mm256_castsi256_si128(vdiff);
__m128i vtmp2 = _mm256_extracti128_si256(vdiff, 1);
vdiff1 = _mm256_cvtepu8_epi16(vtmp1);
vdiff2 = _mm256_cvtepu8_epi16(vtmp2);
vres1 = _mm256_mullo_epi16(vdiff1, vdiff1);
vres2 = _mm256_mullo_epi16(vdiff2, vdiff2);
_mm256_storeu_si256((__m256i *)(dst), vres1);
_mm256_storeu_si256((__m256i *)(dst + 16), vres2);
// Set zero to uninitialized memory to avoid uninitialized loads later
*(uint32_t *)(dst + 32) = _mm_cvtsi128_si32(_mm_setzero_si128());
src1 += stride;
src2 += stride2;
dst += sse_stride;
}
}
static AOM_FORCE_INLINE __m256i xx_load_and_pad(uint16_t *src, int col,
int block_width) {
__m128i v128tmp = _mm_loadu_si128((__m128i *)(src));
if (col == 0) {
// For the first column, replicate the first element twice to the left
v128tmp = _mm_shuffle_epi8(v128tmp, *(__m128i *)shufflemask_16b[0]);
}
if (col == block_width - 4) {
// For the last column, replicate the last element twice to the right
v128tmp = _mm_shuffle_epi8(v128tmp, *(__m128i *)shufflemask_16b[1]);
}
return _mm256_cvtepu16_epi32(v128tmp);
}
static AOM_FORCE_INLINE int32_t xx_mask_and_hadd(__m256i vsum, int i) {
// Mask the required 5 values inside the vector
__m256i vtmp = _mm256_and_si256(vsum, *(__m256i *)sse_bytemask[i]);
__m128i v128a, v128b;
// Extract 256b as two 128b registers A and B
v128a = _mm256_castsi256_si128(vtmp);
v128b = _mm256_extracti128_si256(vtmp, 1);
// A = [A0+B0, A1+B1, A2+B2, A3+B3]
v128a = _mm_add_epi32(v128a, v128b);
// B = [A2+B2, A3+B3, 0, 0]
v128b = _mm_srli_si128(v128a, 8);
// A = [A0+B0+A2+B2, A1+B1+A3+B3, X, X]
v128a = _mm_add_epi32(v128a, v128b);
// B = [A1+B1+A3+B3, 0, 0, 0]
v128b = _mm_srli_si128(v128a, 4);
// A = [A0+B0+A2+B2+A1+B1+A3+B3, X, X, X]
v128a = _mm_add_epi32(v128a, v128b);
return _mm_extract_epi32(v128a, 0);
}
static void apply_temporal_filter(
const uint8_t *frame1, const unsigned int stride, const uint8_t *frame2,
const unsigned int stride2, const int block_width, const int block_height,
const int *subblock_mses, unsigned int *accumulator, uint16_t *count,
uint16_t *frame_sse, uint32_t *luma_sse_sum,
const double inv_num_ref_pixels, const double decay_factor,
const double inv_factor, const double weight_factor, double *d_factor) {
assert(((block_width == 16) || (block_width == 32)) &&
((block_height == 16) || (block_height == 32)));
uint32_t acc_5x5_sse[BH][BW];
if (block_width == 32) {
get_squared_error_32x32_avx2(frame1, stride, frame2, stride2, block_width,
block_height, frame_sse, SSE_STRIDE);
} else {
get_squared_error_16x16_avx2(frame1, stride, frame2, stride2, block_width,
block_height, frame_sse, SSE_STRIDE);
}
__m256i vsrc[5];
// Traverse 4 columns at a time
// First and last columns will require padding
for (int col = 0; col < block_width; col += 4) {
uint16_t *src = (col) ? frame_sse + col - 2 : frame_sse;
// Load and pad(for first and last col) 3 rows from the top
for (int i = 2; i < 5; i++) {
vsrc[i] = xx_load_and_pad(src, col, block_width);
src += SSE_STRIDE;
}
// Copy first row to first 2 vectors
vsrc[0] = vsrc[2];
vsrc[1] = vsrc[2];
for (int row = 0; row < block_height; row++) {
__m256i vsum = _mm256_setzero_si256();
// Add 5 consecutive rows
for (int i = 0; i < 5; i++) {
vsum = _mm256_add_epi32(vsum, vsrc[i]);
}
// Push all elements by one element to the top
for (int i = 0; i < 4; i++) {
vsrc[i] = vsrc[i + 1];
}
// Load next row to the last element
if (row <= block_height - 4) {
vsrc[4] = xx_load_and_pad(src, col, block_width);
src += SSE_STRIDE;
} else {
vsrc[4] = vsrc[3];
}
// Accumulate the sum horizontally
for (int i = 0; i < 4; i++) {
acc_5x5_sse[row][col + i] = xx_mask_and_hadd(vsum, i);
}
}
}
for (int i = 0, k = 0; i < block_height; i++) {
for (int j = 0; j < block_width; j++, k++) {
const int pixel_value = frame2[i * stride2 + j];
uint32_t diff_sse = acc_5x5_sse[i][j] + luma_sse_sum[i * BW + j];
const double window_error = diff_sse * inv_num_ref_pixels;
const int subblock_idx =
(i >= block_height / 2) * 2 + (j >= block_width / 2);
const double block_error = (double)subblock_mses[subblock_idx];
const double combined_error =
weight_factor * window_error + block_error * inv_factor;
double scaled_error =
combined_error * d_factor[subblock_idx] * decay_factor;
scaled_error = AOMMIN(scaled_error, 7);
const int weight = (int)(exp(-scaled_error) * TF_WEIGHT_SCALE);
count[k] += weight;
accumulator[k] += weight * pixel_value;
}
}
}
void av1_apply_temporal_filter_avx2(
const YV12_BUFFER_CONFIG *frame_to_filter, const MACROBLOCKD *mbd,
const BLOCK_SIZE block_size, const int mb_row, const int mb_col,
const int num_planes, const double *noise_levels, const MV *subblock_mvs,
const int *subblock_mses, const int q_factor, const int filter_strength,
const uint8_t *pred, uint32_t *accum, uint16_t *count) {
const int is_high_bitdepth = frame_to_filter->flags & YV12_FLAG_HIGHBITDEPTH;
assert(block_size == BLOCK_32X32 && "Only support 32x32 block with avx2!");
assert(TF_WINDOW_LENGTH == 5 && "Only support window length 5 with avx2!");
assert(!is_high_bitdepth && "Only support low bit-depth with avx2!");
assert(num_planes >= 1 && num_planes <= MAX_MB_PLANE);
(void)is_high_bitdepth;
const int mb_height = block_size_high[block_size];
const int mb_width = block_size_wide[block_size];
const int frame_height = frame_to_filter->y_crop_height;
const int frame_width = frame_to_filter->y_crop_width;
const int min_frame_size = AOMMIN(frame_height, frame_width);
// Variables to simplify combined error calculation.
const double inv_factor = 1.0 / ((TF_WINDOW_BLOCK_BALANCE_WEIGHT + 1) *
TF_SEARCH_ERROR_NORM_WEIGHT);
const double weight_factor =
(double)TF_WINDOW_BLOCK_BALANCE_WEIGHT * inv_factor;
// Adjust filtering based on q.
// Larger q -> stronger filtering -> larger weight.
// Smaller q -> weaker filtering -> smaller weight.
double q_decay = pow((double)q_factor / TF_Q_DECAY_THRESHOLD, 2);
q_decay = CLIP(q_decay, 1e-5, 1);
if (q_factor >= TF_QINDEX_CUTOFF) {
// Max q_factor is 255, therefore the upper bound of q_decay is 8.
// We do not need a clip here.
q_decay = 0.5 * pow((double)q_factor / 64, 2);
}
// Smaller strength -> smaller filtering weight.
double s_decay = pow((double)filter_strength / TF_STRENGTH_THRESHOLD, 2);
s_decay = CLIP(s_decay, 1e-5, 1);
double d_factor[4] = { 0 };
uint16_t frame_sse[SSE_STRIDE * BH] = { 0 };
uint32_t luma_sse_sum[BW * BH] = { 0 };
for (int subblock_idx = 0; subblock_idx < 4; subblock_idx++) {
// Larger motion vector -> smaller filtering weight.
const MV mv = subblock_mvs[subblock_idx];
const double distance = sqrt(pow(mv.row, 2) + pow(mv.col, 2));
double distance_threshold = min_frame_size * TF_SEARCH_DISTANCE_THRESHOLD;
distance_threshold = AOMMAX(distance_threshold, 1);
d_factor[subblock_idx] = distance / distance_threshold;
d_factor[subblock_idx] = AOMMAX(d_factor[subblock_idx], 1);
}
// Handle planes in sequence.
int plane_offset = 0;
for (int plane = 0; plane < num_planes; ++plane) {
const uint32_t plane_h = mb_height >> mbd->plane[plane].subsampling_y;
const uint32_t plane_w = mb_width >> mbd->plane[plane].subsampling_x;
const uint32_t frame_stride = frame_to_filter->strides[plane == 0 ? 0 : 1];
const int frame_offset = mb_row * plane_h * frame_stride + mb_col * plane_w;
const uint8_t *ref = frame_to_filter->buffers[plane] + frame_offset;
const int ss_x_shift =
mbd->plane[plane].subsampling_x - mbd->plane[AOM_PLANE_Y].subsampling_x;
const int ss_y_shift =
mbd->plane[plane].subsampling_y - mbd->plane[AOM_PLANE_Y].subsampling_y;
const int num_ref_pixels = TF_WINDOW_LENGTH * TF_WINDOW_LENGTH +
((plane) ? (1 << (ss_x_shift + ss_y_shift)) : 0);
const double inv_num_ref_pixels = 1.0 / num_ref_pixels;
// Larger noise -> larger filtering weight.
const double n_decay = 0.5 + log(2 * noise_levels[plane] + 5.0);
// Decay factors for non-local mean approach.
const double decay_factor = 1 / (n_decay * q_decay * s_decay);
// Filter U-plane and V-plane using Y-plane. This is because motion
// search is only done on Y-plane, so the information from Y-plane
// will be more accurate. The luma sse sum is reused in both chroma
// planes.
if (plane == AOM_PLANE_U) {
for (unsigned int i = 0, k = 0; i < plane_h; i++) {
for (unsigned int j = 0; j < plane_w; j++, k++) {
for (int ii = 0; ii < (1 << ss_y_shift); ++ii) {
for (int jj = 0; jj < (1 << ss_x_shift); ++jj) {
const int yy = (i << ss_y_shift) + ii; // Y-coord on Y-plane.
const int xx = (j << ss_x_shift) + jj; // X-coord on Y-plane.
luma_sse_sum[i * BW + j] += frame_sse[yy * SSE_STRIDE + xx];
}
}
}
}
}
apply_temporal_filter(ref, frame_stride, pred + plane_offset, plane_w,
plane_w, plane_h, subblock_mses, accum + plane_offset,
count + plane_offset, frame_sse, luma_sse_sum,
inv_num_ref_pixels, decay_factor, inv_factor,
weight_factor, d_factor);
plane_offset += plane_h * plane_w;
}
}