| 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 | {
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| 21 | namespace core
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| 22 | {
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| 23 | class cvmatrix;
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| 24 | }
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| 25 | namespace gui
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| 26 | {
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| 27 | class LayoutPosition;
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| 28 | class SpinBox;
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| 29 | class DoubleSpinBox;
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| 30 | }
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| 31 | namespace filter
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| 32 | {
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| 33 | class ButterworthLowPass;
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| 34 | }
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| 35 | }
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| 36 |
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| 37 | // Storage for Layout
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| 38 | //de-templatized for pimpl idom
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| 39 | //comes from iir from Bernd Porr
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| 40 | class LayoutStorage
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| 41 | {
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| 42 | public:
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| 43 | LayoutStorage(int MaxPoles)
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| 44 | {
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| 45 | this->MaxPoles=MaxPoles;
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| 46 | m_pairs=(Iir::PoleZeroPair*)malloc((MaxPoles+1)/2*sizeof(Iir::PoleZeroPair));
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| 47 | }
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| 48 | ~LayoutStorage()
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| 49 | {
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| 50 | free(m_pairs);
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| 51 | }
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| 52 | operator Iir::LayoutBase ()
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| 53 | {
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| 54 | return Iir::LayoutBase (MaxPoles, m_pairs);
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| 55 | }
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| 56 |
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| 57 | private:
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| 58 | Iir::PoleZeroPair *m_pairs;
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| 59 | int MaxPoles;
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| 60 | };
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| 61 |
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| 62 | // Storage for Cascade
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| 63 | //de-templatized for pimpl idom
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| 64 | //comes from iir from Bernd Porr
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| 65 | class CascadeStages
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| 66 | {
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| 67 | public:
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| 68 | CascadeStages(int MaxStages)
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| 69 | {
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| 70 | this->MaxStages=MaxStages;
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| 71 | m_stages=(Iir::Cascade::Stage*)malloc(MaxStages*sizeof(Iir::Cascade::Stage));
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| 72 | m_states=(Iir::DirectFormII*)malloc(MaxStages*sizeof(Iir::DirectFormII));
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| 73 | }
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| 74 | ~CascadeStages()
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| 75 | {
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| 76 | free(m_stages);
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| 77 | free(m_states);
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| 78 | }
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| 79 | void reset ()
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| 80 | {
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| 81 | Iir::DirectFormII* state = m_states;
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| 82 | for (int i = MaxStages; --i >= 0; ++state)
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| 83 | state->reset();
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| 84 | }
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| 85 |
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| 86 | template <typename Sample>
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| 87 | inline Sample filter(const Sample in)
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| 88 | {
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| 89 | double out = in;
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| 90 | Iir::DirectFormII* state = m_states;
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| 91 | Iir::Biquad const* stage = m_stages;
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| 92 | for (int i = MaxStages; --i >= 0; ++state, ++stage)
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| 93 | out = state->process1 (out, *stage);
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| 94 | return static_cast<Sample> (out);
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| 95 | }
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| 96 |
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| 97 | Iir::Cascade::Storage getCascadeStorage()
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| 98 | {
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| 99 | return Iir::Cascade::Storage (MaxStages, m_stages);
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| 100 | }
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| 101 |
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| 102 | private:
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| 103 | int MaxStages;
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| 104 | Iir::Cascade::Stage *m_stages;
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| 105 | Iir::DirectFormII *m_states;
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| 106 | };
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| 107 |
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| 108 | //de-templatized for pimpl idom
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| 109 | //comes from iir from Bernd Porr
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| 110 | class PoleFilter : Iir::Butterworth::LowPassBase,public CascadeStages
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| 111 | {
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| 112 | public:
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| 113 | PoleFilter (int MaxPoles):CascadeStages((MaxPoles + 1) / 2)
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| 114 | {
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| 115 | this->MaxPoles=MaxPoles;
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| 116 | m_analogStorage=new LayoutStorage(MaxPoles);
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| 117 | m_digitalStorage=new LayoutStorage(MaxPoles);
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| 118 | // This glues together the factored base classes
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| 119 | // with the templatized storage classes.
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| 120 | Iir::Butterworth::LowPassBase::setCascadeStorage (this->getCascadeStorage());
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| 121 | Iir::Butterworth::LowPassBase::setPrototypeStorage (*m_analogStorage,*m_digitalStorage);
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| 122 | }
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| 123 | ~PoleFilter()
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| 124 | {
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| 125 | delete m_analogStorage;
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| 126 | delete m_digitalStorage;
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| 127 | }
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| 128 | void setup (double sampleRate,double cutoffFrequency)
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| 129 | {
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| 130 | Iir::Butterworth::LowPassBase::setup (MaxPoles, sampleRate,cutoffFrequency);
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| 131 | }
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| 132 |
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| 133 | private:
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| 134 | int MaxPoles;
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| 135 | LayoutStorage* m_analogStorage;
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| 136 | LayoutStorage* m_digitalStorage;
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| 137 | };
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| 138 |
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| 139 |
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| 140 | class ButterworthLowPass_impl
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| 141 | {
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| 142 | public:
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| 143 | ButterworthLowPass_impl(flair::filter::ButterworthLowPass* self,const flair::gui::LayoutPosition* position,std::string name,int order);
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| 144 | ~ButterworthLowPass_impl();
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| 145 | void UpdateFrom(const flair::core::io_data *data);
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| 146 | flair::core::cvmatrix *output;
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| 147 |
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| 148 | private:
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| 149 | flair::gui::DoubleSpinBox *cutoff,*T;
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| 150 | PoleFilter* f;
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| 151 | bool first_update;
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| 152 | flair::core::Time previous_time;
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| 153 | };
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| 154 |
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| 155 | #endif // BUTTERWORTHLOWPASS_H_IMPL_H
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