1 | /*!
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2 | * \file ButterworthLowPass_impl.h
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3 | * \brief Classe permettant le calcul d'un filtre passe bas de Butterworth
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4 | * \author Guillaume Sanahuja, Copyright Heudiasyc UMR UTC/CNRS 7253
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5 | * \date 2011/05/01
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6 | * \version 4.0
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7 | */
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8 |
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9 | #ifndef BUTTERWORTHLOWPASS_H_IMPL_H
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10 | #define BUTTERWORTHLOWPASS_H_IMPL_H
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11 |
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12 | #include <IODevice.h>
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13 | #include <Butterworth.h>
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14 |
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15 | namespace flair
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16 | {
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17 | namespace core
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18 | {
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19 | class cvmatrix;
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20 | }
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21 | namespace gui
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22 | {
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23 | class LayoutPosition;
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24 | class SpinBox;
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25 | class DoubleSpinBox;
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26 | }
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27 | namespace filter
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28 | {
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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 | {
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38 | public:
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39 | LayoutStorage(int MaxPoles)
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40 | {
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41 | this->MaxPoles=MaxPoles;
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42 | m_pairs=(Iir::PoleZeroPair*)malloc((MaxPoles+1)/2*sizeof(Iir::PoleZeroPair));
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43 | }
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44 | ~LayoutStorage()
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45 | {
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46 | free(m_pairs);
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47 | }
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48 | operator Iir::LayoutBase ()
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49 | {
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50 | return Iir::LayoutBase (MaxPoles, m_pairs);
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51 | }
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52 |
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53 | private:
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54 | Iir::PoleZeroPair *m_pairs;
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55 | int MaxPoles;
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56 | };
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57 |
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58 | // Storage for Cascade
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59 | //de-templatized for pimpl idom
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60 | //comes from iir from Bernd Porr
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61 | class CascadeStages
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62 | {
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63 | public:
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64 | CascadeStages(int MaxStages)
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65 | {
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66 | this->MaxStages=MaxStages;
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67 | m_stages=(Iir::Cascade::Stage*)malloc(MaxStages*sizeof(Iir::Cascade::Stage));
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68 | m_states=(Iir::DirectFormII*)malloc(MaxStages*sizeof(Iir::DirectFormII));
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69 | }
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70 | ~CascadeStages()
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71 | {
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72 | free(m_stages);
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73 | free(m_states);
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74 | }
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75 | void reset ()
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76 | {
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77 | Iir::DirectFormII* state = m_states;
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78 | for (int i = MaxStages; --i >= 0; ++state)
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79 | state->reset();
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80 | }
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81 |
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82 | template <typename Sample>
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83 | inline Sample filter(const Sample in)
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84 | {
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85 | double out = in;
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86 | Iir::DirectFormII* state = m_states;
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87 | Iir::Biquad const* stage = m_stages;
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88 | for (int i = MaxStages; --i >= 0; ++state, ++stage)
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89 | out = state->process1 (out, *stage);
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90 | return static_cast<Sample> (out);
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91 | }
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92 |
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93 | Iir::Cascade::Storage getCascadeStorage()
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94 | {
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95 | return Iir::Cascade::Storage (MaxStages, m_stages);
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96 | }
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97 |
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98 | private:
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99 | int MaxStages;
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100 | Iir::Cascade::Stage *m_stages;
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101 | Iir::DirectFormII *m_states;
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102 | };
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103 |
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104 | //de-templatized for pimpl idom
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105 | //comes from iir from Bernd Porr
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106 | class PoleFilter : Iir::Butterworth::LowPassBase,public CascadeStages
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107 | {
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108 | public:
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109 | PoleFilter (int MaxPoles):CascadeStages((MaxPoles + 1) / 2)
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110 | {
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111 | this->MaxPoles=MaxPoles;
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112 | m_analogStorage=new LayoutStorage(MaxPoles);
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113 | m_digitalStorage=new LayoutStorage(MaxPoles);
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114 | // This glues together the factored base classes
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115 | // with the templatized storage classes.
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116 | Iir::Butterworth::LowPassBase::setCascadeStorage (this->getCascadeStorage());
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117 | Iir::Butterworth::LowPassBase::setPrototypeStorage (*m_analogStorage,*m_digitalStorage);
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118 | }
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119 | ~PoleFilter()
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120 | {
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121 | delete m_analogStorage;
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122 | delete m_digitalStorage;
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123 | }
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124 | void setup (double sampleRate,double cutoffFrequency)
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125 | {
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126 | Iir::Butterworth::LowPassBase::setup (MaxPoles, sampleRate,cutoffFrequency);
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127 | }
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128 |
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129 | private:
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130 | int MaxPoles;
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131 | LayoutStorage* m_analogStorage;
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132 | LayoutStorage* m_digitalStorage;
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133 | };
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134 |
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135 |
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136 | class ButterworthLowPass_impl
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137 | {
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138 | public:
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139 | ButterworthLowPass_impl(flair::filter::ButterworthLowPass* self,const flair::gui::LayoutPosition* position,std::string name,int order);
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140 | ~ButterworthLowPass_impl();
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141 | void UpdateFrom(const flair::core::io_data *data);
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142 | flair::core::cvmatrix *output;
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143 |
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144 | private:
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145 | flair::gui::DoubleSpinBox *cutoff,*T;
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146 | PoleFilter* f;
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147 | bool first_update;
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148 | flair::core::Time previous_time;
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149 | };
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150 |
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151 | #endif // BUTTERWORTHLOWPASS_H_IMPL_H
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