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85 lines
2.5 KiB
85 lines
2.5 KiB
// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// fx_phaser.h
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//
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// Stereo Phaser audio effects proposed in the context of the MiniDexed project
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//
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#pragma once
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#include "fx_components.h"
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class PhaserStage;
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class PhaserParameter : public FXBase
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{
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friend class PhaserStage;
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DISALLOW_COPY_AND_ASSIGN(PhaserParameter);
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public:
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PhaserParameter(float32_t sampling_rate, float32_t frequency = 0.5f, float32_t q = 1.0f);
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virtual ~PhaserParameter();
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void setFrequency(float32_t frequency);
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inline float32_t getFrequency() const;
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void setResonance(float32_t q);
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inline float32_t getResonance() const;
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private:
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void computeCoefficients();
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float32_t frequency_; // LFO frequency in Hz (0.01 - 5.0)
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float32_t resonance_; // Resonance factor for the filters (0.5 - 10.0)
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float32_t a0, a1, a2, b1, b2; // Coefficients for the stage's filter
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};
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class PhaserStage : public FXElement
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{
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DISALLOW_COPY_AND_ASSIGN(PhaserStage);
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public:
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PhaserStage(float32_t sampling_rate, PhaserParameter* params);
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virtual void processSample(float32_t inL, float32_t inR, float32_t& outL, float32_t& outR) override;
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private:
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PhaserParameter* params_; // All paremters of the phaser including the inner coefficients
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float32_t z1[2], z2[2]; // State variables for the stage's filter
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};
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#define NUM_PHASER_STAGES 6
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class Phaser : public FXElement
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{
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DISALLOW_COPY_AND_ASSIGN(Phaser);
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public:
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Phaser(float32_t sampling_rate, float32_t frequency = 0.5f, float32_t resonance = 1.0f);
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virtual ~Phaser();
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virtual void processSample(float32_t inL, float32_t inR, float32_t& outL, float32_t& outR) override;
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void setFrequency(float32_t frequency);
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float32_t getFrequency() const;
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void setResonance(float32_t resonance);
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float32_t getResonance() const;
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private:
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PhaserParameter params_;
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LFO lfo_;
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PhaserStage* stages_[NUM_PHASER_STAGES];
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}; |