Added DaisySP

2026-04-24 14:46:05 +02:00
parent 82190216c3
commit dd63b3aed4
96 changed files with 10613 additions and 0 deletions
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+/*
+Copyright (c) 2020 Electrosmith, Corp, Emilie Gillet
+
+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.
+*/
+
+#ifndef DSY_ONEPOLE_H
+#define DSY_ONEPOLE_H
+
+#include "Utility/dsp.h"
+#include <cmath>
+#include <algorithm>
+
+namespace daisysp
+{
+/**         
+    @brief One Pole Lowpass / Highpass Filter
+    @author beserge
+    @date Dec 2023 
+    Ported from pichenettes/stmlib/dsp/filter.h \n 
+    \n to an independent module. \n
+    Original code written by Emilie Gillet. \n
+*/
+class OnePole
+{
+  public:
+    OnePole() {}
+    ~OnePole() {}
+
+    /**
+     * @brief Operational modes of the filter
+     * - LOW_PASS = cuts out high frequency sound, lets low frequency sound pass through
+     * - HIGH_PASS = cuts out low frequency sound, lets high frequency sound pass through
+     */
+    enum FilterMode
+    {
+        FILTER_MODE_LOW_PASS,
+        FILTER_MODE_HIGH_PASS
+    };
+
+    /** Initializes the module */
+    void Init()
+    {
+        Reset();
+        mode_ = FILTER_MODE_LOW_PASS;
+    }
+
+    /** Reset the module to its default state */
+    inline void Reset() { state_ = 0.0f; }
+
+    /** Set the filter cutoff frequency
+    *   \param freq Cutoff frequency. Valid range from 0 to .497f
+    */
+    inline void SetFrequency(float freq)
+    {
+        // Clip coefficient to about 100.
+        freq = freq < 0.497f ? freq : 0.497f;
+
+        g_  = tanf(PI_F * freq);
+        gi_ = 1.f / (1.f + g_);
+    }
+
+    /** Set the filter mode
+    *   \param mode Filter mode. Can be lowpass or highpass
+    */
+    inline void SetFilterMode(FilterMode mode) { mode_ = mode; }
+
+    /** Process audio through the filter
+    *   \param in The next sample to be processed
+    */
+    inline float Process(float in)
+    {
+        float lp;
+        lp     = (g_ * in + state_) * gi_;
+        state_ = g_ * (in - lp) + lp;
+
+        switch(mode_)
+        {
+            case FILTER_MODE_LOW_PASS: return lp;
+            case FILTER_MODE_HIGH_PASS: return in - lp;
+        }
+
+        return 0.0f;
+    }
+
+    /** Process a block of audio through the filter
+    *   \param in_out Pointer to the block of samples to be processed
+    *   \param size Size of the block of samples to be processed.
+    */
+    inline void ProcessBlock(float* in_out, size_t size)
+    {
+        while(size--)
+        {
+            *in_out = Process(*in_out);
+            ++in_out;
+        }
+    }
+
+  private:
+    float      g_;
+    float      gi_;
+    float      state_;
+    FilterMode mode_;
+};
+
+} // namespace daisysp
+
+#endif // DSY_ONEPOLE_H