1 | // %flair:license{
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2 | // This file is part of the Flair framework distributed under the
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3 | // CECILL-C License, Version 1.0.
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4 | // %flair:license}
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5 | /*!
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6 | * \file ButterworthLowPass_impl.h
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7 | * \brief Classe permettant le calcul d'un filtre passe bas de Butterworth
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8 | * \author Guillaume Sanahuja, Copyright Heudiasyc UMR UTC/CNRS 7253
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9 | * \date 2011/05/01
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10 | * \version 4.0
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11 | */
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12 |
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13 | #ifndef BUTTERWORTHLOWPASS_H_IMPL_H
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14 | #define BUTTERWORTHLOWPASS_H_IMPL_H
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15 |
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16 | #include <IODevice.h>
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17 | #include <Butterworth.h>
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18 |
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19 | namespace flair {
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20 | namespace core {
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21 | class Matrix;
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22 | }
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23 | namespace gui {
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24 | class LayoutPosition;
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25 | class SpinBox;
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26 | class DoubleSpinBox;
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27 | }
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28 | namespace filter {
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29 | class ButterworthLowPass;
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30 | }
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31 | }
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32 |
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33 | // Storage for Layout
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34 | // de-templatized for pimpl idom
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35 | // comes from iir from Bernd Porr
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36 | class LayoutStorage {
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37 | public:
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38 | LayoutStorage(int MaxPoles) {
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39 | this->MaxPoles = MaxPoles;
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40 | m_pairs = (Iir::PoleZeroPair *)malloc((MaxPoles + 1) / 2 *
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41 | sizeof(Iir::PoleZeroPair));
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42 | }
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43 | ~LayoutStorage() { free(m_pairs); }
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44 | operator Iir::LayoutBase() { return Iir::LayoutBase(MaxPoles, m_pairs); }
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45 |
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46 | private:
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47 | Iir::PoleZeroPair *m_pairs;
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48 | int MaxPoles;
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49 | };
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50 |
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51 | // Storage for Cascade
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52 | // de-templatized for pimpl idom
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53 | // comes from iir from Bernd Porr
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54 | class CascadeStages {
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55 | public:
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56 | CascadeStages(int MaxStages) {
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57 | this->MaxStages = MaxStages;
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58 | m_stages =
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59 | (Iir::Cascade::Stage *)malloc(MaxStages * sizeof(Iir::Cascade::Stage));
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60 | m_states =
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61 | (Iir::DirectFormII *)malloc(MaxStages * sizeof(Iir::DirectFormII));
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62 | }
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63 | ~CascadeStages() {
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64 | free(m_stages);
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65 | free(m_states);
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66 | }
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67 | void reset() {
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68 | Iir::DirectFormII *state = m_states;
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69 | for (int i = MaxStages; --i >= 0; ++state)
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70 | state->reset();
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71 | }
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72 |
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73 | template <typename Sample> inline Sample filter(const Sample in) {
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74 | double out = in;
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75 | Iir::DirectFormII *state = m_states;
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76 | Iir::Biquad const *stage = m_stages;
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77 | for (int i = MaxStages; --i >= 0; ++state, ++stage)
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78 | out = state->process1(out, *stage);
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79 | return static_cast<Sample>(out);
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80 | }
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81 |
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82 | Iir::Cascade::Storage getCascadeStorage() {
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83 | return Iir::Cascade::Storage(MaxStages, m_stages);
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84 | }
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85 |
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86 | private:
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87 | int MaxStages;
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88 | Iir::Cascade::Stage *m_stages;
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89 | Iir::DirectFormII *m_states;
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90 | };
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91 |
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92 | // de-templatized for pimpl idom
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93 | // comes from iir from Bernd Porr
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94 | class PoleFilter : Iir::Butterworth::LowPassBase, public CascadeStages {
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95 | public:
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96 | PoleFilter(int MaxPoles) : CascadeStages((MaxPoles + 1) / 2) {
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97 | this->MaxPoles = MaxPoles;
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98 | m_analogStorage = new LayoutStorage(MaxPoles);
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99 | m_digitalStorage = new LayoutStorage(MaxPoles);
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100 | // This glues together the factored base classes
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101 | // with the templatized storage classes.
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102 | Iir::Butterworth::LowPassBase::setCascadeStorage(this->getCascadeStorage());
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103 | Iir::Butterworth::LowPassBase::setPrototypeStorage(*m_analogStorage,
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104 | *m_digitalStorage);
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105 | }
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106 | ~PoleFilter() {
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107 | delete m_analogStorage;
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108 | delete m_digitalStorage;
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109 | }
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110 | void setup(double sampleRate, double cutoffFrequency) {
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111 | Iir::Butterworth::LowPassBase::setup(MaxPoles, sampleRate, cutoffFrequency);
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112 | }
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113 |
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114 | private:
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115 | int MaxPoles;
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116 | LayoutStorage *m_analogStorage;
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117 | LayoutStorage *m_digitalStorage;
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118 | };
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119 |
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120 | class ButterworthLowPass_impl {
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121 | public:
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122 | ButterworthLowPass_impl(const flair::filter::ButterworthLowPass *self,
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123 | const flair::gui::LayoutPosition *position,
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124 | std::string name, uint32_t order,uint32_t nbRow,uint32_t nbCol);
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125 | ~ButterworthLowPass_impl();
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126 | void UpdateFrom(const flair::core::io_data *data);
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127 | flair::core::Matrix *output;
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128 |
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129 | private:
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130 | void settingsChanged(PoleFilter*f,float inputValue);
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131 | flair::gui::DoubleSpinBox *cutoff, *T;
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132 | PoleFilter **f;
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133 | uint32_t order;
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134 | uint32_t nbRow, nbCol;
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135 | const flair::filter::ButterworthLowPass *self;
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136 | };
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137 |
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138 | #endif // BUTTERWORTHLOWPASS_H_IMPL_H
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