| /* |
| * Copyright (c) 2021 Arm Limited. All rights reserved. |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * 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 "PlatformMath.hpp" |
| |
| #if 0 == ARM_DSP_AVAILABLE |
| #include <cmath> |
| #include <numeric> |
| #endif /* 0 == ARM_DSP_AVAILABLE */ |
| |
| namespace arm { |
| namespace app { |
| namespace math { |
| |
| float MathUtils::CosineF32(float radians) |
| { |
| #if ARM_DSP_AVAILABLE |
| return arm_cos_f32(radians); |
| #else /* ARM_DSP_AVAILABLE */ |
| return cos(radians); |
| #endif /* ARM_DSP_AVAILABLE */ |
| } |
| |
| float MathUtils::SqrtF32(float input) |
| { |
| #if ARM_DSP_AVAILABLE |
| float output = 0.f; |
| arm_sqrt_f32(input, &output); |
| return output; |
| #else /* ARM_DSP_AVAILABLE */ |
| return sqrtf(input); |
| #endif /* ARM_DSP_AVAILABLE */ |
| } |
| |
| float MathUtils::MeanF32(float* ptrSrc, const uint32_t srcLen) |
| { |
| if (!srcLen) { |
| return 0.f; |
| } |
| |
| #if ARM_DSP_AVAILABLE |
| float result = 0.f; |
| arm_mean_f32(ptrSrc, srcLen, &result); |
| return result; |
| #else /* ARM_DSP_AVAILABLE */ |
| float acc = std::accumulate(ptrSrc, ptrSrc + srcLen, 0.0); |
| return acc/srcLen; |
| #endif /* ARM_DSP_AVAILABLE */ |
| } |
| |
| float MathUtils::StdDevF32(float* ptrSrc, const uint32_t srcLen, |
| const float mean) |
| { |
| if (!srcLen) { |
| return 0.f; |
| } |
| #if ARM_DSP_AVAILABLE |
| /** |
| * Note Standard deviation calculation can be off |
| * by > 0.01 but less than < 0.1, according to |
| * preliminary findings. |
| **/ |
| UNUSED(mean); |
| float stdDev = 0; |
| arm_std_f32(ptrSrc, srcLen, &stdDev); |
| return stdDev; |
| #else /* ARM_DSP_AVAILABLE */ |
| auto VarianceFunction = [=](float acc, const float value) { |
| return acc + (((value - mean) * (value - mean))/ srcLen); |
| }; |
| |
| float acc = std::accumulate(ptrSrc, ptrSrc + srcLen, 0.0, |
| VarianceFunction); |
| |
| return sqrtf(acc); |
| #endif /* ARM_DSP_AVAILABLE */ |
| } |
| |
| bool MathUtils::FftInitF32(const uint16_t fftLen, arm::app::math::FftInstance& fftInstance) |
| { |
| #if ARM_DSP_AVAILABLE |
| if (!fftInstance.initialised) { |
| arm_status status = arm_rfft_fast_init_f32(&fftInstance.instance, fftLen); |
| |
| if (ARM_MATH_SUCCESS != status) { |
| return false; |
| } |
| fftInstance.initialised = true; |
| } |
| #else |
| UNUSED(fftLen); |
| UNUSED(fftInstance); |
| #endif /* ARM_DSP_AVAILABLE */ |
| return true; |
| } |
| |
| void MathUtils::FftF32(std::vector<float>& input, |
| std::vector<float>& fftOutput, |
| arm::app::math::FftInstance& fftInstance) |
| { |
| #if ARM_DSP_AVAILABLE |
| arm_rfft_fast_f32(&fftInstance.instance, input.data(), fftOutput.data(), 0); |
| #else |
| UNUSED(fftInstance); |
| const int inputLength = input.size(); |
| |
| for (int k = 0; k <= inputLength / 2; k++) { |
| float sumReal = 0, sumImag = 0; |
| |
| for (int t = 0; t < inputLength; t++) { |
| auto angle = static_cast<float>(2 * M_PI * t * k / inputLength); |
| sumReal += input[t] * cosf(angle); |
| sumImag += -input[t] * sinf(angle); |
| } |
| |
| /* Arrange output to [real0, realN/2, real1, im1, real2, im2, ...] */ |
| if (k == 0) { |
| fftOutput[0] = sumReal; |
| } else if (k == inputLength / 2) { |
| fftOutput[1] = sumReal; |
| } else { |
| fftOutput[k*2] = sumReal; |
| fftOutput[k*2 + 1] = sumImag; |
| }; |
| } |
| #endif /* ARM_DSP_AVAILABLE */ |
| } |
| |
| void MathUtils::VecLogarithmF32(std::vector <float>& input, |
| std::vector <float>& output) |
| { |
| #if ARM_DSP_AVAILABLE |
| arm_vlog_f32(input.data(), output.data(), |
| output.size()); |
| #else /* ARM_DSP_AVAILABLE */ |
| for (auto in = input.begin(), out = output.begin(); |
| in != input.end() && out != output.end(); ++in, ++out) { |
| *out = logf(*in); |
| } |
| #endif /* ARM_DSP_AVAILABLE */ |
| } |
| |
| float MathUtils::DotProductF32(float* srcPtrA, float* srcPtrB, |
| const uint32_t srcLen) |
| { |
| float output = 0.f; |
| |
| #if ARM_DSP_AVAILABLE |
| arm_dot_prod_f32(srcPtrA, srcPtrB, srcLen, &output); |
| #else /* ARM_DSP_AVAILABLE */ |
| for (uint32_t i = 0; i < srcLen; ++i) { |
| output += *srcPtrA++ * *srcPtrB++; |
| } |
| #endif /* ARM_DSP_AVAILABLE */ |
| |
| return output; |
| } |
| |
| bool MathUtils::ComplexMagnitudeSquaredF32(float* ptrSrc, |
| const uint32_t srcLen, |
| float* ptrDst, |
| const uint32_t dstLen) |
| { |
| if (dstLen < srcLen/2) { |
| printf_err("dstLen must be greater than srcLen/2"); |
| return false; |
| } |
| |
| #if ARM_DSP_AVAILABLE |
| arm_cmplx_mag_squared_f32(ptrSrc, ptrDst, srcLen/2); |
| #else /* ARM_DSP_AVAILABLE */ |
| for (uint32_t j = 0; j < srcLen/2; ++j) { |
| const float real = *ptrSrc++; |
| const float im = *ptrSrc++; |
| *ptrDst++ = real*real + im*im; |
| } |
| #endif /* ARM_DSP_AVAILABLE */ |
| return true; |
| } |
| |
| } /* namespace math */ |
| } /* namespace app */ |
| } /* namespace arm */ |