Added DaisySP

daisysp/Effects/sampleratereducer.cpp

@@ -0,0 +1,43 @@
+#include "dsp.h"
+#include "sampleratereducer.h"
+#include <math.h>
+
+using namespace daisysp;
+void SampleRateReducer::Init()
+{
+    frequency_       = .2f;
+    phase_           = 0.0f;
+    sample_          = 0.0f;
+    next_sample_     = 0.0f;
+    previous_sample_ = 0.0f;
+}
+
+float SampleRateReducer::Process(float in)
+{
+    float this_sample = next_sample_;
+    next_sample_      = 0.f;
+    phase_ += frequency_;
+    if(phase_ >= 1.0f)
+    {
+        phase_ -= 1.0f;
+        float t = phase_ / frequency_;
+        // t = 0: the transition occurred right at this sample.
+        // t = 1: the transition occurred at the previous sample.
+        // Use linear interpolation to recover the fractional sample.
+        float new_sample
+            = previous_sample_ + (in - previous_sample_) * (1.0f - t);
+        float discontinuity = new_sample - sample_;
+        this_sample += discontinuity * ThisBlepSample(t);
+        next_sample_ = discontinuity * NextBlepSample(t);
+        sample_      = new_sample;
+    }
+    next_sample_ += sample_;
+    previous_sample_ = in;
+
+    return this_sample;
+}
+
+void SampleRateReducer::SetFreq(float frequency)
+{
+    frequency_ = fclamp(frequency, 0.f, 1.f);
+}