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// Copyright 2019 The libgav1 Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/dsp/distance_weighted_blend.h"
#include "src/utils/cpu.h"
#if LIBGAV1_ENABLE_NEON
#include <arm_neon.h>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include "src/dsp/arm/common_neon.h"
#include "src/dsp/constants.h"
#include "src/dsp/dsp.h"
#include "src/utils/common.h"
namespace libgav1 {
namespace dsp {
namespace {
constexpr int kInterPostRoundBit = 4;
inline int16x8_t ComputeWeightedAverage8(const int16x8_t pred0,
const int16x8_t pred1,
const int16x4_t weights[2]) {
// TODO(https://issuetracker.google.com/issues/150325685): Investigate range.
const int32x4_t wpred0_lo = vmull_s16(weights[0], vget_low_s16(pred0));
const int32x4_t wpred0_hi = vmull_s16(weights[0], vget_high_s16(pred0));
const int32x4_t blended_lo =
vmlal_s16(wpred0_lo, weights[1], vget_low_s16(pred1));
const int32x4_t blended_hi =
vmlal_s16(wpred0_hi, weights[1], vget_high_s16(pred1));
return vcombine_s16(vqrshrn_n_s32(blended_lo, kInterPostRoundBit + 4),
vqrshrn_n_s32(blended_hi, kInterPostRoundBit + 4));
}
template <int width, int height>
inline void DistanceWeightedBlendSmall_NEON(const int16_t* prediction_0,
const int16_t* prediction_1,
const int16x4_t weights[2],
void* const dest,
const ptrdiff_t dest_stride) {
auto* dst = static_cast<uint8_t*>(dest);
constexpr int step = 16 / width;
for (int y = 0; y < height; y += step) {
const int16x8_t src_00 = vld1q_s16(prediction_0);
const int16x8_t src_10 = vld1q_s16(prediction_1);
prediction_0 += 8;
prediction_1 += 8;
const int16x8_t res0 = ComputeWeightedAverage8(src_00, src_10, weights);
const int16x8_t src_01 = vld1q_s16(prediction_0);
const int16x8_t src_11 = vld1q_s16(prediction_1);
prediction_0 += 8;
prediction_1 += 8;
const int16x8_t res1 = ComputeWeightedAverage8(src_01, src_11, weights);
const uint8x8_t result0 = vqmovun_s16(res0);
const uint8x8_t result1 = vqmovun_s16(res1);
if (width == 4) {
StoreLo4(dst, result0);
dst += dest_stride;
StoreHi4(dst, result0);
dst += dest_stride;
StoreLo4(dst, result1);
dst += dest_stride;
StoreHi4(dst, result1);
dst += dest_stride;
} else {
assert(width == 8);
vst1_u8(dst, result0);
dst += dest_stride;
vst1_u8(dst, result1);
dst += dest_stride;
}
}
}
inline void DistanceWeightedBlendLarge_NEON(const int16_t* prediction_0,
const int16_t* prediction_1,
const int16x4_t weights[2],
const int width, const int height,
void* const dest,
const ptrdiff_t dest_stride) {
auto* dst = static_cast<uint8_t*>(dest);
int y = height;
do {
int x = 0;
do {
const int16x8_t src0_lo = vld1q_s16(prediction_0 + x);
const int16x8_t src1_lo = vld1q_s16(prediction_1 + x);
const int16x8_t res_lo =
ComputeWeightedAverage8(src0_lo, src1_lo, weights);
const int16x8_t src0_hi = vld1q_s16(prediction_0 + x + 8);
const int16x8_t src1_hi = vld1q_s16(prediction_1 + x + 8);
const int16x8_t res_hi =
ComputeWeightedAverage8(src0_hi, src1_hi, weights);
const uint8x16_t result =
vcombine_u8(vqmovun_s16(res_lo), vqmovun_s16(res_hi));
vst1q_u8(dst + x, result);
x += 16;
} while (x < width);
dst += dest_stride;
prediction_0 += width;
prediction_1 += width;
} while (--y != 0);
}
inline void DistanceWeightedBlend_NEON(const void* prediction_0,
const void* prediction_1,
const uint8_t weight_0,
const uint8_t weight_1, const int width,
const int height, void* const dest,
const ptrdiff_t dest_stride) {
const auto* pred_0 = static_cast<const int16_t*>(prediction_0);
const auto* pred_1 = static_cast<const int16_t*>(prediction_1);
int16x4_t weights[2] = {vdup_n_s16(weight_0), vdup_n_s16(weight_1)};
// TODO(johannkoenig): Investigate the branching. May be fine to call with a
// variable height.
if (width == 4) {
if (height == 4) {
DistanceWeightedBlendSmall_NEON<4, 4>(pred_0, pred_1, weights, dest,
dest_stride);
} else if (height == 8) {
DistanceWeightedBlendSmall_NEON<4, 8>(pred_0, pred_1, weights, dest,
dest_stride);
} else {
assert(height == 16);
DistanceWeightedBlendSmall_NEON<4, 16>(pred_0, pred_1, weights, dest,
dest_stride);
}
return;
}
if (width == 8) {
switch (height) {
case 4:
DistanceWeightedBlendSmall_NEON<8, 4>(pred_0, pred_1, weights, dest,
dest_stride);
return;
case 8:
DistanceWeightedBlendSmall_NEON<8, 8>(pred_0, pred_1, weights, dest,
dest_stride);
return;
case 16:
DistanceWeightedBlendSmall_NEON<8, 16>(pred_0, pred_1, weights, dest,
dest_stride);
return;
default:
assert(height == 32);
DistanceWeightedBlendSmall_NEON<8, 32>(pred_0, pred_1, weights, dest,
dest_stride);
return;
}
}
DistanceWeightedBlendLarge_NEON(pred_0, pred_1, weights, width, height, dest,
dest_stride);
}
void Init8bpp() {
Dsp* const dsp = dsp_internal::GetWritableDspTable(kBitdepth8);
assert(dsp != nullptr);
dsp->distance_weighted_blend = DistanceWeightedBlend_NEON;
}
} // namespace
void DistanceWeightedBlendInit_NEON() { Init8bpp(); }
} // namespace dsp
} // namespace libgav1
#else // !LIBGAV1_ENABLE_NEON
namespace libgav1 {
namespace dsp {
void DistanceWeightedBlendInit_NEON() {}
} // namespace dsp
} // namespace libgav1
#endif // LIBGAV1_ENABLE_NEON
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