- added Delay

- added MultiDelay
- added Diffusor

reverb/diffusor.hpp

@@ -0,0 +1,126 @@
+/* 
+ * jayDSP, A cross-platform Digital Signal Processing library written in modern C++.
+ * Copyright (C) 2025 Jens Ahrensfeld, All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all 
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+ * File: diffusor.hpp
+ * Author Jens Ahrensfeld on 26.10.2025.
+ */
+
+#ifndef DSP_DIFFUSOR_H
+#define DSP_DIFFUSOR_H
+
+#include "delay/multiDelay.hpp"
+#include <common/mix.hpp>
+
+template<typename T, size_t numCh>
+class Diffusor
+{
+	MultiDelay<T, numCh> m_dly;
+	int m_shuffle_spec[numCh];
+
+	void print_shuffle()
+	{
+		std::cout << "shuffle" << std::endl;
+		for (int i=0; i < numCh; i++)
+		{
+			std::cout << m_shuffle_spec[i] << " ";
+		}
+		std::cout << std::endl;
+	}
+
+	void shuffle_init(double pn)
+	{
+		// Shuffle spec
+		for (int i=0; i < numCh; i++)
+		{
+			m_shuffle_spec[i] = i;
+		}
+
+		// Shuffle values
+		for (int i=0; i < 2*numCh; i++)
+		{
+			int i1 = rand() & (numCh-1);
+			int i2 = rand() & (numCh-1);
+			int temp = m_shuffle_spec[i1];
+			m_shuffle_spec[i1] = m_shuffle_spec[i2];
+			m_shuffle_spec[i2] = temp;
+		}
+
+		// Shuffle signs
+		for (int i=0; i < numCh; i++)
+		{
+			double z = (double)rand()/(double)RAND_MAX;
+			if (z < pn)
+			{
+				m_shuffle_spec[i] *= (T)-1;
+			}
+		}
+
+		print_shuffle();
+	}
+	public:
+	Diffusor(uint maxDelaySize, double pn=0.5)
+	: m_dly(maxDelaySize, 0)
+	{
+		shuffle_init(pn);
+	}
+
+	void setDelay(uint delay)
+	{
+		m_dly.setDelay(delay, 0);
+	}
+
+	uint getDelay()
+	{
+		return m_dly.getDelay();
+	}
+
+	inline T process(T in)
+	{
+		T temp[numCh];
+		m_dly.process(in, temp);
+
+		Shuffle<T, numCh>::inPlace(temp, m_shuffle_spec);
+		Hadamard<T, numCh>::inPlace(temp);
+		Householder<T, numCh>::inPlace(temp);
+
+		return temp[0];
+	}
+
+	// In-place
+	inline void process_multi(T in_out[numCh])
+	{
+		m_dly.process(in_out);
+
+		Shuffle<T, numCh>::inPlace(in_out, m_shuffle_spec);
+		Hadamard<T, numCh>::inPlace(in_out);
+	}
+
+	// Out-of-place
+	inline void process_multi(T in[numCh], T out[numCh])
+	{
+		m_dly.process(in, out);
+
+		Shuffle<T, numCh>::outOfPlace(in, out, m_shuffle_spec);
+		Hadamard<T, numCh>::inPlace(out);
+	}
+};
+
+#endif // DSP_DIFFUSOR_H