Added DaisySP

daisysp/Synthesis/formantosc.h

@@ -0,0 +1,81 @@
+/*
+Copyright (c) 2020 Electrosmith, Corp, Emilie Gillet
+
+Use of this source code is governed by an MIT-style
+license that can be found in the LICENSE file or at
+https://opensource.org/licenses/MIT.
+*/
+
+#pragma once
+#ifndef DSY_FORMANTOSCILLATOR_H
+#define DSY_FORMANTOSCILLATOR_H
+
+#include <stdint.h>
+#ifdef __cplusplus
+
+/** @file formantosc.h */
+
+namespace daisysp
+{
+/**  
+       @brief Formant Oscillator Module. 
+       @author Ben Sergentanis
+       @date Dec 2020 
+       Sinewave with aliasing-free phase reset. \n \n
+       Ported from pichenettes/eurorack/plaits/dsp/oscillator/formant_oscillator.h \n
+       to an independent module. \n
+       Original code written by Emilie Gillet in 2016. \n
+*/
+class FormantOscillator
+{
+  public:
+    FormantOscillator() {}
+    ~FormantOscillator() {}
+
+    /** Initializes the FormantOscillator module.
+        \param sample_rate - The sample rate of the audio engine being run. 
+    */
+    void Init(float sample_rate);
+
+    /** Get the next sample
+    */
+    float Process();
+
+    /** Set the formant frequency.
+        \param freq Frequency in Hz
+    */
+    void SetFormantFreq(float freq);
+
+    /** Set the carrier frequency. This is the "main" frequency.
+        \param freq Frequency in Hz
+    */
+    void SetCarrierFreq(float freq);
+
+    /** Set the amount of phase shift
+        \param ps Typically 0-1. Works with other values though, including negative.
+    */
+    void SetPhaseShift(float ps);
+
+  private:
+    inline float Sine(float phase);
+    inline float ThisBlepSample(float t);
+    inline float NextBlepSample(float t);
+
+    // Oscillator state.
+    float carrier_phase_;
+    float formant_phase_;
+    float next_sample_;
+
+    // For interpolation of parameters.
+    float carrier_frequency_;
+    float formant_frequency_;
+    float phase_shift_;
+    float ps_inc_;
+
+    float sample_rate_;
+
+    //DISALLOW_COPY_AND_ASSIGN(FormantOscillator);
+};
+} //namespace daisysp
+#endif
+#endif