Éanna Ó Catháin | c6ab02a | 2021-04-07 14:35:25 +0100 | [diff] [blame] | 1 | // |
| 2 | // Copyright © 2020 Arm Ltd and Contributors. All rights reserved. |
| 3 | // SPDX-License-Identifier: MIT |
| 4 | // |
| 5 | |
| 6 | #include "MathUtils.hpp" |
| 7 | #include <vector> |
| 8 | #include <cmath> |
| 9 | #include <cstdio> |
| 10 | |
| 11 | void MathUtils::FftF32(std::vector<float>& input, |
| 12 | std::vector<float>& fftOutput) |
| 13 | { |
| 14 | const int inputLength = input.size(); |
| 15 | |
| 16 | for (int k = 0; k <= inputLength / 2; k++) |
| 17 | { |
| 18 | float sumReal = 0, sumImag = 0; |
| 19 | |
| 20 | for (int t = 0; t < inputLength; t++) |
| 21 | { |
| 22 | float angle = 2 * M_PI * t * k / inputLength; |
| 23 | sumReal += input[t] * cosf(angle); |
| 24 | sumImag += -input[t] * sinf(angle); |
| 25 | } |
| 26 | |
| 27 | /* Arrange output to [real0, realN/2, real1, im1, real2, im2, ...] */ |
| 28 | if (k == 0) |
| 29 | { |
| 30 | fftOutput[0] = sumReal; |
| 31 | } |
| 32 | else if (k == inputLength / 2) |
| 33 | { |
| 34 | fftOutput[1] = sumReal; |
| 35 | } |
| 36 | else |
| 37 | { |
| 38 | fftOutput[k*2] = sumReal; |
| 39 | fftOutput[k*2 + 1] = sumImag; |
| 40 | }; |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | float MathUtils::DotProductF32(float* srcPtrA, float* srcPtrB, |
| 45 | const int srcLen) |
| 46 | { |
| 47 | float output = 0.f; |
| 48 | |
| 49 | for (int i = 0; i < srcLen; ++i) |
| 50 | { |
| 51 | output += *srcPtrA++ * *srcPtrB++; |
| 52 | } |
| 53 | return output; |
| 54 | } |
| 55 | |
| 56 | bool MathUtils::ComplexMagnitudeSquaredF32(float* ptrSrc, |
| 57 | const int srcLen, |
| 58 | float* ptrDst, |
| 59 | const int dstLen) |
| 60 | { |
| 61 | if (dstLen < srcLen/2) |
| 62 | { |
| 63 | printf("dstLen must be greater than srcLen/2"); |
| 64 | return false; |
| 65 | } |
| 66 | |
| 67 | for (int j = 0; j < srcLen; ++j) |
| 68 | { |
| 69 | const float real = *ptrSrc++; |
| 70 | const float im = *ptrSrc++; |
| 71 | *ptrDst++ = real*real + im*im; |
| 72 | } |
| 73 | return true; |
| 74 | } |
| 75 | |
| 76 | void MathUtils::VecLogarithmF32(std::vector <float>& input, |
| 77 | std::vector <float>& output) |
| 78 | { |
| 79 | for (auto in = input.begin(), out = output.begin(); |
| 80 | in != input.end(); ++in, ++out) |
| 81 | { |
| 82 | *out = logf(*in); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | float MathUtils::MeanF32(float* ptrSrc, const uint32_t srcLen) |
| 87 | { |
| 88 | if (!srcLen) |
| 89 | { |
| 90 | return 0.f; |
| 91 | } |
| 92 | |
| 93 | float acc = std::accumulate(ptrSrc, ptrSrc + srcLen, 0.0); |
| 94 | return acc/srcLen; |
| 95 | } |
| 96 | |
| 97 | float MathUtils::StdDevF32(float* ptrSrc, const uint32_t srcLen, |
| 98 | const float mean) |
| 99 | { |
| 100 | if (!srcLen) |
| 101 | { |
| 102 | return 0.f; |
| 103 | } |
| 104 | auto VarianceFunction = [=](float acc, const float value) { |
| 105 | return acc + (((value - mean) * (value - mean))/ srcLen); |
| 106 | }; |
| 107 | |
| 108 | float acc = std::accumulate(ptrSrc, ptrSrc + srcLen, 0.0, |
| 109 | VarianceFunction); |
| 110 | return sqrtf(acc); |
| 111 | } |
| 112 | |