Added DaisySP

daisysp/Utility/samplehold.h

@@ -0,0 +1,69 @@
+/*
+Copyright (c) 2020 Electrosmith, Corp, Paul Batchelor
+
+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_SAMPLEHOLD_H
+#define DSY_SAMPLEHOLD_H
+
+#include <stdint.h>
+#ifdef __cplusplus
+
+namespace daisysp
+{
+/** Dual track and hold / Sample and hold module. \n 
+    Ported from soundpipe by Ben Sergentanis, June 2020.
+    @author Paul Batchelor
+    @date   2015
+*/
+class SampleHold
+{
+  public:
+    SampleHold() {}
+    ~SampleHold() {}
+
+    enum Mode
+    {
+        MODE_SAMPLE_HOLD,
+        MODE_TRACK_HOLD,
+        MODE_LAST,
+    };
+
+    /** Process the next sample. Both sample and track and hold are run in parallel
+    \param trigger Trigger the sample/track and hold
+    \param input   Signal to be sampled/tracked and held
+    \param mode    Whether to output the tracked or sampled values.
+    */
+    inline float
+    Process(bool trigger, float input, Mode mode = MODE_SAMPLE_HOLD)
+    {
+        Update(trigger, input);
+        return mode == MODE_SAMPLE_HOLD ? sample_ : track_;
+    }
+
+  private:
+    float track_    = 0;
+    float sample_   = 0;
+    bool  previous_ = false;
+
+
+    inline void Update(bool trigger, float input)
+    {
+        if(trigger)
+        {
+            if(!previous_)
+            {
+                sample_ = input;
+            }
+            track_ = input;
+        }
+        previous_ = trigger;
+    }
+};
+} // namespace daisysp
+#endif
+#endif