Added DaisySP

daisysp/Effects/flanger.h

@@ -0,0 +1,83 @@
+/*
+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_FLANGER_H
+#define DSY_FLANGER_H
+#ifdef __cplusplus
+
+#include <stdint.h>
+#include "Utility/delayline.h"
+
+/** @file flanger.h */
+
+namespace daisysp
+{
+/** @brief Flanging Audio Effect 
+ *
+ * Generates a modulating phase shifted copy of a signal, and recombines
+ * with the original to create a 'flanging' sound effect.
+ */
+class Flanger
+{
+  public:
+    /** Initialize the modules
+        \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 of the signal to feedback into the delay line.
+        \param feedback Works 0-1.
+    */
+    void SetFeedback(float feedback);
+
+    /** How much to modulate the delay by.
+        \param depth Works 0-1.
+    */
+    void SetLfoDepth(float depth);
+
+    /** Set lfo frequency.
+        \param freq Frequency in Hz
+    */
+    void SetLfoFreq(float freq);
+
+    /** Set the internal delay rate. 
+        \param delay Tuned for 0-1. Maps to .1 to 7 ms.
+    */
+    void SetDelay(float delay);
+
+    /** Set the delay time in ms.
+        \param ms Delay time in ms, .1 to 7 ms.
+    */
+    void SetDelayMs(float ms);
+
+  private:
+    float                    sample_rate_;
+    static constexpr int32_t kDelayLength = 960; // 20 ms at 48kHz = .02 * 48000
+
+    float feedback_;
+
+    //triangle lfos
+    float lfo_phase_;
+    float lfo_freq_;
+    float lfo_amp_;
+
+    float delay_;
+
+    DelayLine<float, kDelayLength> del_;
+
+    float ProcessLfo();
+};
+} //namespace daisysp
+#endif
+#endif