Added DaisySP

daisysp/Filters/soap.h

@@ -0,0 +1,70 @@
+/*
+Copyright (c) 2020 Electrosmith, Corp, Brian Tice, Tom Erbe
+
+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
+
+namespace daisysp
+{
+/** Second Order All Pass Filter
+
+This is from Tom Erbe's synth notes. The filter
+can be configured to be a band pass or band reject
+
+Ported by: Brian Tice
+*/
+class Soap
+{
+  public:
+    Soap() {}
+    ~Soap() {}
+
+    /** Initializes the filter
+            float sample_rate - sample rate of the audio engine being run, and the frequency that the Process function will be called.
+        */
+    void Init(float sample_rate);
+
+    /**
+            Process the input signal, updating all of the outputs
+        */
+    void Process(float in);
+
+    /**
+            Sets the center frequency of the filter.
+        */
+    void SetCenterFreq(float f);
+
+    /**
+            Sets the low frequency threshold of the filter.
+        */
+    void SetFilterBandwidth(float b);
+
+    /** Bandpass output
+            \return bandpass output of the filter
+        */
+    inline float Bandpass() { return out_bandpass_; }
+
+    /** Bandreject output
+            \return bandreject output of the filter
+        */
+    inline float Bandreject() { return out_bandreject_; }
+
+  private:
+    float soap_center_freq_;
+    float soap_bandwidth_;
+    float in_0_;
+    float din_1_;
+    float din_2_;
+    float dout_1_;
+    float dout_2_;
+    float all_output_;
+    float out_bandpass_;
+    float out_bandreject_;
+    float sr_;
+};
+
+} // namespace daisysp