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/*
* Copyright (c) 2025 Zhao Zhili
*
* 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
*/
#include "sao.h"
#include <wasm_simd128.h>
#include "libavcodec/defs.h"
#define HEVC_MAX_PB_SIZE 64
void ff_hevc_sao_band_filter_8x8_8_simd128(uint8_t *dst, const uint8_t *src,
ptrdiff_t stride_dst,
ptrdiff_t stride_src,
const int16_t *sao_offset_val,
int sao_left_class, int width,
int height)
{
int8_t offset_table[32] = {0};
v128_t offset_low, offset_high;
for (int k = 0; k < 4; k++)
offset_table[(k + sao_left_class) & 31] = (int8_t)sao_offset_val[k + 1];
offset_low = wasm_v128_load(offset_table);
offset_high = wasm_v128_load(&offset_table[16]);
for (int y = height; y > 0; y -= 2) {
v128_t src_v, src_high;
v128_t v0, v1;
src_v = wasm_v128_load64_zero(src);
src += stride_src;
src_v = wasm_v128_load64_lane(src, src_v, 1);
src += stride_src;
v0 = wasm_u8x16_shr(src_v, 3);
v1 = wasm_i8x16_sub(v0, wasm_i8x16_const_splat(16));
v0 = wasm_i8x16_swizzle(offset_low, v0);
v1 = wasm_i8x16_swizzle(offset_high, v1);
v0 = wasm_v128_or(v0, v1);
src_high = wasm_u16x8_extend_high_u8x16(src_v);
v1 = wasm_i16x8_extend_high_i8x16(v0);
src_v = wasm_u16x8_extend_low_u8x16(src_v);
v0 = wasm_i16x8_extend_low_i8x16(v0);
v0 = wasm_i16x8_add_sat(src_v, v0);
v1 = wasm_i16x8_add_sat(src_high, v1);
v0 = wasm_u8x16_narrow_i16x8(v0, v1);
wasm_v128_store64_lane(dst, v0, 0);
dst += stride_dst;
wasm_v128_store64_lane(dst, v0, 1);
dst += stride_dst;
}
}
void ff_hevc_sao_band_filter_16x16_8_simd128(uint8_t *dst, const uint8_t *src,
ptrdiff_t stride_dst,
ptrdiff_t stride_src,
const int16_t *sao_offset_val,
int sao_left_class, int width,
int height)
{
int8_t offset_table[32] = {0};
v128_t offset_low, offset_high;
for (int k = 0; k < 4; k++)
offset_table[(k + sao_left_class) & 31] = (int8_t)sao_offset_val[k + 1];
offset_low = wasm_v128_load(offset_table);
offset_high = wasm_v128_load(&offset_table[16]);
for (int y = height; y > 0; y--) {
for (int x = 0; x < width; x += 16) {
v128_t src_v, src_high;
v128_t v0, v1;
src_v = wasm_v128_load(&src[x]);
v0 = wasm_u8x16_shr(src_v, 3);
v1 = wasm_i8x16_sub(v0, wasm_i8x16_const_splat(16));
v0 = wasm_i8x16_swizzle(offset_low, v0);
v1 = wasm_i8x16_swizzle(offset_high, v1);
v0 = wasm_v128_or(v0, v1);
src_high = wasm_u16x8_extend_high_u8x16(src_v);
v1 = wasm_i16x8_extend_high_i8x16(v0);
src_v = wasm_u16x8_extend_low_u8x16(src_v);
v0 = wasm_i16x8_extend_low_i8x16(v0);
v0 = wasm_i16x8_add_sat(src_v, v0);
v1 = wasm_i16x8_add_sat(src_high, v1);
v0 = wasm_u8x16_narrow_i16x8(v0, v1);
wasm_v128_store(&dst[x], v0);
}
dst += stride_dst;
src += stride_src;
}
}
void ff_hevc_sao_edge_filter_8x8_8_simd128(uint8_t *dst, const uint8_t *src,
ptrdiff_t stride_dst,
const int16_t *sao_offset_val,
int eo, int width, int height)
{
static const int8_t pos[4][2][2] = {
{ { -1, 0 }, { 1, 0 } }, // horizontal
{ { 0, -1 }, { 0, 1 } }, // vertical
{ { -1, -1 }, { 1, 1 } }, // 45 degree
{ { 1, -1 }, { -1, 1 } }, // 135 degree
};
int a_stride, b_stride;
ptrdiff_t stride_src = (2 * HEVC_MAX_PB_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
const v128_t edge_idx = wasm_u8x16_make(1, 2, 0, 3,
4, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0);
v128_t sao_offset = wasm_v128_load(sao_offset_val);
v128_t one = wasm_i8x16_const_splat(1);
v128_t two = wasm_i8x16_const_splat(2);
a_stride = pos[eo][0][0] + pos[eo][0][1] * stride_src;
b_stride = pos[eo][1][0] + pos[eo][1][1] * stride_src;
for (int y = height; y > 0; y -= 2) {
v128_t v0, v1, v2;
v128_t diff0, diff1;
v0 = wasm_v128_load64_zero(src);
v1 = wasm_v128_load64_zero(src + a_stride);
v2 = wasm_v128_load64_zero(src + b_stride);
src += stride_src;
v0 = wasm_v128_load64_lane(src, v0, 1);
v1 = wasm_v128_load64_lane(src + a_stride, v1, 1);
v2 = wasm_v128_load64_lane(src + b_stride, v2, 1);
src += stride_src;
diff0 = wasm_u8x16_gt(v0, v1);
v1 = wasm_u8x16_lt(v0, v1);
diff0 = wasm_i8x16_sub(v1, diff0);
diff1 = wasm_u8x16_gt(v0, v2);
v2 = wasm_u8x16_lt(v0, v2);
diff1 = wasm_i8x16_sub(v2, diff1);
v1 = wasm_i8x16_add(diff0, two);
v1 = wasm_i8x16_add(v1, diff1);
v2 = wasm_i8x16_swizzle(edge_idx, v1); // offset_val
v1 = wasm_i8x16_shl(v2, 1); // Access int16_t
v2 = wasm_i8x16_add(v1, one); // Access upper half of int16_t
diff0 = wasm_i8x16_shuffle(v1, v2, 0, 16, 1, 17, 2, 18, 3, 19, 4,
20, 5, 21, 6, 22, 7, 23);
diff1 = wasm_i8x16_shuffle(v1, v2, 8, 24, 9, 25, 10, 26, 11, 27,
12, 28, 13, 29, 14, 30, 15, 31);
v1 = wasm_u16x8_extend_high_u8x16(v0);
v0 = wasm_u16x8_extend_low_u8x16(v0);
diff0 = wasm_i8x16_swizzle(sao_offset, diff0);
diff1 = wasm_i8x16_swizzle(sao_offset, diff1);
v0 = wasm_i16x8_add_sat(v0, diff0);
v1 = wasm_i16x8_add_sat(v1, diff1);
v0 = wasm_u8x16_narrow_i16x8(v0, v1);
wasm_v128_store64_lane(dst, v0, 0);
dst += stride_dst;
wasm_v128_store64_lane(dst, v0, 1);
dst += stride_dst;
}
}
void ff_hevc_sao_edge_filter_16x16_8_simd128(uint8_t *dst, const uint8_t *src,
ptrdiff_t stride_dst,
const int16_t *sao_offset_val,
int eo, int width, int height)
{
static const int8_t pos[4][2][2] = {
{ { -1, 0 }, { 1, 0 } }, // horizontal
{ { 0, -1 }, { 0, 1 } }, // vertical
{ { -1, -1 }, { 1, 1 } }, // 45 degree
{ { 1, -1 }, { -1, 1 } }, // 135 degree
};
int a_stride, b_stride;
ptrdiff_t stride_src = (2 * HEVC_MAX_PB_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
const v128_t edge_idx = wasm_u8x16_make(1, 2, 0, 3,
4, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0);
v128_t sao_offset = wasm_v128_load(sao_offset_val);
v128_t one = wasm_i8x16_const_splat(1);
v128_t two = wasm_i8x16_const_splat(2);
a_stride = pos[eo][0][0] + pos[eo][0][1] * stride_src;
b_stride = pos[eo][1][0] + pos[eo][1][1] * stride_src;
for (int y = height; y > 0; y--) {
for (int x = 0; x < width; x += 16) {
v128_t v0, v1, v2;
v128_t diff0, diff1;
v0 = wasm_v128_load(&src[x]);
v1 = wasm_v128_load(&src[x + a_stride]);
v2 = wasm_v128_load(&src[x + b_stride]);
diff0 = wasm_u8x16_gt(v0, v1);
v1 = wasm_u8x16_lt(v0, v1);
diff0 = wasm_i8x16_sub(v1, diff0);
diff1 = wasm_u8x16_gt(v0, v2);
v2 = wasm_u8x16_lt(v0, v2);
diff1 = wasm_i8x16_sub(v2, diff1);
v1 = wasm_i8x16_add(diff0, two);
v1 = wasm_i8x16_add(v1, diff1);
v2 = wasm_i8x16_swizzle(edge_idx, v1); // offset_val
v1 = wasm_i8x16_shl(v2, 1); // Access int16_t
v2 = wasm_i8x16_add(v1, one); // Access upper half of int16_t
diff0 = wasm_i8x16_shuffle(v1, v2, 0, 16, 1, 17, 2, 18, 3, 19, 4,
20, 5, 21, 6, 22, 7, 23);
diff1 = wasm_i8x16_shuffle(v1, v2, 8, 24, 9, 25, 10, 26, 11, 27,
12, 28, 13, 29, 14, 30, 15, 31);
v1 = wasm_u16x8_extend_high_u8x16(v0);
v0 = wasm_u16x8_extend_low_u8x16(v0);
diff0 = wasm_i8x16_swizzle(sao_offset, diff0);
diff1 = wasm_i8x16_swizzle(sao_offset, diff1);
v0 = wasm_i16x8_add_sat(v0, diff0);
v1 = wasm_i16x8_add_sat(v1, diff1);
v0 = wasm_u8x16_narrow_i16x8(v0, v1);
wasm_v128_store(&dst[x], v0);
}
src += stride_src;
dst += stride_dst;
}
}
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