Added DaisySP

daisysp/Effects/phaser.h

@@ -0,0 +1,139 @@
+/*
+Copyright (c) 2020 Electrosmith, Corp
+
+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_PHASER_H
+#define DSY_PHASER_H
+#ifdef __cplusplus
+
+#include <stdint.h>
+#include "Utility/delayline.h"
+
+/** @file phaser.h */
+
+namespace daisysp
+{
+/**  
+    @brief Single Phaser engine. Used in Phaser.
+    @author Ben Sergentanis
+*/
+class PhaserEngine
+{
+  public:
+    PhaserEngine() {}
+    ~PhaserEngine() {}
+
+    /** Initialize the module
+        \param sample_rate Audio engine sample rate.
+    */
+    void Init(float sample_rate);
+
+    /** Get the next sample
+        \param in Sample to process
+    */
+    float Process(float in);
+
+    /** How much to modulate the allpass filter by.
+        \param depth Works 0-1.
+    */
+    void SetLfoDepth(float depth);
+
+    /** Set lfo frequency.
+        \param lfo_freq Frequency in Hz
+    */
+    void SetLfoFreq(float lfo_freq);
+
+    /** Set the allpass frequency
+        \param ap_freq Frequency in Hz.
+    */
+    void SetFreq(float ap_freq);
+
+    /** Set the feedback amount.
+        \param feedback Amount from 0-1.
+    */
+    void SetFeedback(float feedback);
+
+  private:
+    float                    sample_rate_;
+    static constexpr int32_t kDelayLength
+        = 2400; // 50 ms at 48kHz = .05 * 48000
+
+    //triangle lfo
+    float lfo_phase_;
+    float lfo_freq_;
+    float lfo_amp_;
+
+    float os_;
+
+    float feedback_;
+    float ap_freq_;
+
+    float deltime_;
+    float last_sample_;
+
+    DelayLine<float, kDelayLength> del_;
+
+    float ProcessLfo();
+};
+
+//wraps up all of the phaser engines
+/**  
+    @brief Phaser Effect.
+    @author Ben Sergentanis
+    @date Jan 2021
+*/
+class Phaser
+{
+  public:
+    Phaser() {}
+    ~Phaser() {}
+
+    /** Initialize the module
+        \param sample_rate Audio engine sample rate
+    */
+    void Init(float sample_rate);
+
+    /** Get the next floating point sample.
+        \param in Sample to process
+    */
+    float Process(float in);
+
+    /** Number of allpass stages.
+        \param poles Works 1 to 8.
+    */
+    void SetPoles(int poles);
+
+    /** Set all lfo depths
+        \param depth Works 0-1.
+    */
+    void SetLfoDepth(float depth);
+
+    /** Set all lfo frequencies.
+        \param lfo_freq Lfo freq in Hz.
+    */
+    void SetLfoFreq(float lfo_freq);
+
+    /** Set all channel allpass freq in Hz.
+        \param ap_freq Frequency in Hz.
+    */
+    void SetFreq(float ap_freq);
+
+    /** Set all channels feedback.
+        \param feedback Works 0-1.
+    */
+    void SetFeedback(float feedback);
+
+  private:
+    static constexpr int kMaxPoles = 8;
+    PhaserEngine         engines_[kMaxPoles];
+    float                gain_frac_;
+    int                  poles_;
+};
+} //namespace daisysp
+#endif
+#endif