| // 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/average_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 = |
| kInterRoundBitsVertical - kInterRoundBitsCompoundVertical; |
| |
| inline uint8x8_t AverageBlend8Row(const int16_t* prediction_0, |
| const int16_t* prediction_1) { |
| const int16x8_t pred0 = vld1q_s16(prediction_0); |
| const int16x8_t pred1 = vld1q_s16(prediction_1); |
| const int16x8_t res = vaddq_s16(pred0, pred1); |
| return vqrshrun_n_s16(res, kInterPostRoundBit + 1); |
| } |
| |
| inline void AverageBlendLargeRow(const int16_t* prediction_0, |
| const int16_t* prediction_1, const int width, |
| uint8_t* dest) { |
| int x = 0; |
| do { |
| const int16x8_t pred_00 = vld1q_s16(&prediction_0[x]); |
| const int16x8_t pred_01 = vld1q_s16(&prediction_1[x]); |
| const int16x8_t res0 = vaddq_s16(pred_00, pred_01); |
| const uint8x8_t res_out0 = vqrshrun_n_s16(res0, kInterPostRoundBit + 1); |
| const int16x8_t pred_10 = vld1q_s16(&prediction_0[x + 8]); |
| const int16x8_t pred_11 = vld1q_s16(&prediction_1[x + 8]); |
| const int16x8_t res1 = vaddq_s16(pred_10, pred_11); |
| const uint8x8_t res_out1 = vqrshrun_n_s16(res1, kInterPostRoundBit + 1); |
| vst1q_u8(dest + x, vcombine_u8(res_out0, res_out1)); |
| x += 16; |
| } while (x < width); |
| } |
| |
| void AverageBlend_NEON(const void* prediction_0, const void* prediction_1, |
| const int width, const int height, void* const dest, |
| const ptrdiff_t dest_stride) { |
| auto* dst = static_cast<uint8_t*>(dest); |
| const auto* pred_0 = static_cast<const int16_t*>(prediction_0); |
| const auto* pred_1 = static_cast<const int16_t*>(prediction_1); |
| int y = height; |
| |
| if (width == 4) { |
| do { |
| const uint8x8_t result = AverageBlend8Row(pred_0, pred_1); |
| pred_0 += 8; |
| pred_1 += 8; |
| |
| StoreLo4(dst, result); |
| dst += dest_stride; |
| StoreHi4(dst, result); |
| dst += dest_stride; |
| y -= 2; |
| } while (y != 0); |
| return; |
| } |
| |
| if (width == 8) { |
| do { |
| vst1_u8(dst, AverageBlend8Row(pred_0, pred_1)); |
| dst += dest_stride; |
| pred_0 += 8; |
| pred_1 += 8; |
| |
| vst1_u8(dst, AverageBlend8Row(pred_0, pred_1)); |
| dst += dest_stride; |
| pred_0 += 8; |
| pred_1 += 8; |
| |
| y -= 2; |
| } while (y != 0); |
| return; |
| } |
| |
| do { |
| AverageBlendLargeRow(pred_0, pred_1, width, dst); |
| dst += dest_stride; |
| pred_0 += width; |
| pred_1 += width; |
| |
| AverageBlendLargeRow(pred_0, pred_1, width, dst); |
| dst += dest_stride; |
| pred_0 += width; |
| pred_1 += width; |
| |
| y -= 2; |
| } while (y != 0); |
| } |
| |
| void Init8bpp() { |
| Dsp* const dsp = dsp_internal::GetWritableDspTable(kBitdepth8); |
| assert(dsp != nullptr); |
| dsp->average_blend = AverageBlend_NEON; |
| } |
| |
| } // namespace |
| |
| void AverageBlendInit_NEON() { Init8bpp(); } |
| |
| } // namespace dsp |
| } // namespace libgav1 |
| |
| #else // !LIBGAV1_ENABLE_NEON |
| |
| namespace libgav1 { |
| namespace dsp { |
| |
| void AverageBlendInit_NEON() {} |
| |
| } // namespace dsp |
| } // namespace libgav1 |
| #endif // LIBGAV1_ENABLE_NEON |