Added DaisySP

2026-04-24 14:46:05 +02:00
parent 82190216c3
commit dd63b3aed4
96 changed files with 10613 additions and 0 deletions
@@ -0,0 +1,100 @@
+/*
+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 ADENV_H
+#define ADENV_H
+#include <stdint.h>
+#ifdef __cplusplus
+
+namespace daisysp
+{
+/** Distinct stages that the phase of the envelope can be located in.
+    @see AdEnv
+*/
+enum AdEnvSegment
+{
+    /** located at phase location 0, and not currently running */
+    ADENV_SEG_IDLE,
+    /** First segment of envelope where phase moves from MIN value to MAX value */
+    ADENV_SEG_ATTACK,
+    /** Second segment of envelope where phase moves from MAX to MIN value */
+    ADENV_SEG_DECAY,
+    /** The final segment of the envelope (currently decay) */
+    ADENV_SEG_LAST,
+};
+
+/** Trigger-able envelope with adjustable min/max, and independent per-segment time control.
+
+    \author shensley
+    \todo - Add Cycling
+    \todo - Implement Curve (its only linear for now).
+    \todo - Maybe make this an ADsr_ that has AD/AR/Asr_ modes.
+ */
+class AdEnv
+{
+  public:
+    AdEnv() {}
+    ~AdEnv() {}
+    /** Initializes the ad envelope.
+
+        Defaults:
+            - current segment = idle
+            - curve = linear
+            - phase = 0
+            - min = 0
+            - max = 1
+
+        \param sample_rate      sample rate of the audio engine being run
+    */
+    void Init(float sample_rate);
+
+    /** Processes the current sample of the envelope. This should be called once
+        per sample period.
+        \return the current envelope value.
+    */
+    float Process();
+
+    /** Starts or retriggers the envelope.*/
+    inline void Trigger() { trigger_ = 1; }
+    /** Sets the length of time (in seconds) for a specific segment. */
+    inline void SetTime(uint8_t seg, float time) { segment_time_[seg] = time; }
+    /** Sets the amount of curve applied. A positve value will create a log
+        curve. Input range: -100 to 100.  (or more)
+    */
+    inline void SetCurve(float scalar) { curve_scalar_ = scalar; }
+    /** Sets the minimum value of the envelope output.
+        Input range: -FLTmax_, to FLTmax_
+    */
+    inline void SetMin(float min) { min_ = min; }
+    /** Sets the maximum value of the envelope output.
+        Input range: -FLTmax_, to FLTmax_
+    */
+    inline void SetMax(float max) { max_ = max; }
+    /** Returns the current output value without processing the next sample */
+    inline float GetValue() const { return (output_ * (max_ - min_)) + min_; }
+    /** Returns the segment of the envelope that the phase is currently located
+        in.
+    */
+    inline uint8_t GetCurrentSegment() { return current_segment_; }
+    /** Returns true if the envelope is currently in any stage apart from idle.
+    */
+    inline bool IsRunning() const { return current_segment_ != ADENV_SEG_IDLE; }
+
+  private:
+    uint8_t  current_segment_, prev_segment_;
+    float    segment_time_[ADENV_SEG_LAST];
+    float    sample_rate_, min_, max_, output_, curve_scalar_;
+    float    c_inc_, curve_x_, retrig_val_;
+    uint32_t phase_;
+    uint8_t  trigger_;
+};
+
+} // namespace daisysp
+#endif
+#endif