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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]) = {
{ 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0x0000, 0x0000, 0x0000 },
{ 0x0000, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0x0000, 0x0000 },
{ 0x0000, 0x0000, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0x0000 },
{ 0x0000, 0x0000, 0x0000, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF }
};
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 unitialized 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 unitialized 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_cvtepi16_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_planewise(
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 double sigma, const int decay_control, unsigned int *accumulator,
uint16_t *count) {
const double h = decay_control * (0.7 + log(sigma + 0.5));
const double beta = 1.0;
uint16_t frame_sse[SSE_STRIDE * BH];
uint32_t acc_5x5_sse[BH][BW];
assert(PLANEWISE_FILTER_WINDOW_LENGTH == 5);
assert(((block_width == 32) && (block_height == 32)) ||
((block_width == 16) && (block_height == 16)));
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_width - 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];
int diff_sse = acc_5x5_sse[i][j];
diff_sse /=
(PLANEWISE_FILTER_WINDOW_LENGTH * PLANEWISE_FILTER_WINDOW_LENGTH);
double scaled_diff = -diff_sse / (2 * beta * h * h);
// clamp the value to avoid underflow in exp()
if (scaled_diff < -15) scaled_diff = -15;
double w = exp(scaled_diff);
const int weight = (int)(w * PLANEWISE_FILTER_WEIGHT_SCALE);
count[k] += weight;
accumulator[k] += weight * pixel_value;
}
}
}
void av1_apply_temporal_filter_planewise_avx2(
const YV12_BUFFER_CONFIG *ref_frame, const MACROBLOCKD *mbd,
const BLOCK_SIZE block_size, const int mb_row, const int mb_col,
const int num_planes, const double noise_level, const uint8_t *pred,
uint32_t *accum, uint16_t *count) {
const int is_high_bitdepth = ref_frame->flags & YV12_FLAG_HIGHBITDEPTH;
if (is_high_bitdepth) {
assert(0 && "Only support low bit-depth with avx2!");
}
const int frame_height = ref_frame->heights[0] << mbd->plane[0].subsampling_y;
const int decay_control = frame_height >= 480 ? 4 : 3;
const int mb_height = block_size_high[block_size];
const int mb_width = block_size_wide[block_size];
const int mb_pels = mb_height * mb_width;
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 = ref_frame->strides[plane == 0 ? 0 : 1];
const int frame_offset = mb_row * plane_h * frame_stride + mb_col * plane_w;
const uint8_t *ref = ref_frame->buffers[plane] + frame_offset;
apply_temporal_filter_planewise(ref, frame_stride, pred + mb_pels * plane,
plane_w, plane_w, plane_h, noise_level,
decay_control, accum + mb_pels * plane,
count + mb_pels * plane);
}
}