Added stereo modulated delay.

MicroDexed.ino

@@ -5,7 +5,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
-   (c)2021      M. Koslowski <positionhigh@gmx.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

UI.hpp

@@ -6,6 +6,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

UI_FX_T3_6.h

@@ -6,6 +6,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

UI_FX_T4.h

@@ -6,6 +6,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

UI_NO_FX.h

@@ -6,6 +6,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

config.h

@@ -6,6 +6,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

control_sgtl5000plus.cpp

@@ -6,6 +6,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

control_sgtl5000plus.h

@@ -6,6 +6,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

dexed_sd.cpp

@@ -6,6 +6,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

dexed_sd.h

@@ -6,6 +6,7 @@
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

disp_plus.h

@@ -5,7 +5,8 @@
    (https://github.com/asb2m10/dexed) for the Teensy-3.5/3.6/4.x/4.x with audio shield.
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
-   (c)2018 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

drums.h

@@ -6,6 +6,7 @@
   droid
 
    (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
 
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal

drumset.h

@@ -5,9 +5,9 @@
    (https://github.com/asb2m10/dexed) for the Teensy-3.5/3.6/4.x with audio shield.
    Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
 
-   (c)2018-2021 M. Koslowski <positionhigh@gmx.de>
+   (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>
-                H. Wirtz <wirtz@parasitstudio.de>
+   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
-                
+
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    (at your option) any later version.

effect_freeverb_simd.cpp

@@ -7,7 +7,8 @@
 
    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
+   in the Software without restriction   (c)2021      H. Wirtz <wirtz@parasitstudio.de>, M. Koslowski <positionhigh@gmx.de>
+, 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:

effect_modulated_delay.cpp

@@ -164,3 +164,155 @@ void AudioEffectModulatedDelay::update(void)
     release(block);
   }
 }
+
+boolean AudioEffectModulatedDelayStereo::begin(short *delayline_l, short *delayline_r, uint16_t d_length)
+{
+#if 0
+  Serial.print(F("AudioEffectModulatedDelayStereo.begin(modulated-delay line length = "));
+  Serial.print(d_length);
+  Serial.println(F(")"));
+#endif
+
+  _delay_length = 0;
+
+  _delayline[0] = NULL;
+  _cb_index[0] = 0;
+  _delay_offset[0] = 0;
+
+  _delayline[1] = NULL;
+  _cb_index[1] = 0;
+  _delay_offset[1] = 0;
+
+  if (delayline_r == NULL)
+    return (false);
+  if (delayline_l == NULL)
+    return (false);
+  if (d_length < 10)
+    return (false);
+
+  _delay_length = d_length;
+
+  _delayline[0] = delayline_l;
+  memset(_delayline[0], 0, _delay_length * sizeof(int16_t));
+  _delay_offset[0] = _delay_length >> 1 ;
+
+  _delayline[1] = delayline_r;
+  memset(_delayline[1], 0, _delay_length * sizeof(int16_t));
+  _delay_offset[1] = _delay_length >> 1 ;
+
+  return (true);
+}
+
+uint16_t AudioEffectModulatedDelayStereo::get_delay_length(void)
+{
+  return (_delay_length);
+}
+
+void AudioEffectModulatedDelayStereo::update(void)
+{
+  audio_block_t *block[2];
+  audio_block_t *modulation;
+
+  if (_delayline == NULL)
+    return;
+
+  block[0] = receiveWritable(0);
+  if (!block[0])
+    block[0] = (audio_block_t*)&zeroblock;
+
+  block[1] = receiveWritable(1);
+  if (!block[1])
+    block[1] = (audio_block_t*)&zeroblock;
+
+  modulation = receiveReadOnly(2);
+  if (!modulation)
+    modulation = (audio_block_t*)&zeroblock;
+
+  if (block[0] && block[1] && modulation)
+  {
+    int16_t *bp[2];
+    int16_t cb_mod_index_neighbor[2];
+    float *mp;
+    float mod_index;
+    float mod_number;
+    float mod_fraction;
+    float modulation_f32[AUDIO_BLOCK_SAMPLES];
+
+    bp[0] = block[0]->data;
+    bp[1] = block[1]->data;
+
+    arm_q15_to_float(modulation->data, modulation_f32, AUDIO_BLOCK_SAMPLES);
+    mp = modulation_f32;
+
+    for (uint16_t i = 0; i < AUDIO_BLOCK_SAMPLES; i++)
+    {
+      // LEFT
+      // calculate the modulation-index as a floating point number for interpolation
+      mod_index = *mp * _delay_offset[0];
+      mod_fraction = modff(mod_index, &mod_number); // split float of mod_index into integer (= mod_number) and fraction part
+
+      // write data into circular buffer (delayline)
+      if (_cb_index[0] >= _delay_length)
+        _cb_index[0] = 0;
+      _delayline[0][_cb_index[0]] = *bp[0];
+
+      // calculate modulation index into circular buffer
+      cb_mod_index[0] = _cb_index[0] - (_delay_offset[0] + mod_number);
+      if (cb_mod_index[0] < 0) // check for negative offsets and correct them
+        cb_mod_index[0] += _delay_length;
+
+      if (cb_mod_index[0] == _delay_length - 1)
+        cb_mod_index_neighbor[0] = 0;
+      else
+        cb_mod_index_neighbor[0] = cb_mod_index[0] + 1;
+
+      *bp[0] = round(float(_delayline[0][cb_mod_index[0]]) * mod_fraction + float(_delayline[0][cb_mod_index_neighbor[0]]) * (1.0 - mod_fraction));
+
+      // push the pointers forward
+      bp[0]++; // next audio data
+      _cb_index[0]++; // next circular buffer index
+
+      // RIGHT
+      // calculate the modulation-index as a floating point number for interpolation
+      mod_index = -1.0 * *mp * _delay_offset[0];
+      mod_fraction = modff(mod_index, &mod_number); // split float of mod_index into integer (= mod_number) and fraction part
+
+      // write data into circular buffer (delayline)
+      if (_cb_index[1] >= _delay_length)
+        _cb_index[1] = 0;
+      _delayline[1][_cb_index[1]] = *bp[1];
+
+      // calculate modulation index into circular buffer
+      cb_mod_index[1] = _cb_index[1] - (_delay_offset[1] + mod_number);
+      if (cb_mod_index[1] < 0) // check for negative offsets and correct them
+        cb_mod_index[1] += _delay_length;
+
+      if (cb_mod_index[1] == _delay_length - 1)
+        cb_mod_index_neighbor[1] = 0;
+      else
+        cb_mod_index_neighbor[1] = cb_mod_index[1] + 1;
+
+      *bp[1] = round(float(_delayline[1][cb_mod_index[1]]) * mod_fraction + float(_delayline[1][cb_mod_index_neighbor[1]]) * (1.0 - mod_fraction));
+
+      // push the pointers forward
+      bp[1]++; // next audio data
+      _cb_index[1]++; // next circular buffer index
+
+      mp++; // next modulation data
+    }
+  }
+
+  if (modulation != (audio_block_t*)&zeroblock)
+    release(modulation);
+
+  if (block[0] != (audio_block_t*)&zeroblock)
+  {
+    transmit(block[0], 0);
+    release(block[0]);
+  }
+  if (block[1] != (audio_block_t*)&zeroblock)
+  {
+    transmit(block[1], 0);
+    release(block[1]);
+  }
+}

effect_modulated_delay.h

@@ -55,4 +55,24 @@ class AudioEffectModulatedDelay :
     uint16_t _delay_offset;
 };
 
+class AudioEffectModulatedDelayStereo :
+  public AudioStream
+{
+  public:
+    AudioEffectModulatedDelayStereo(void):
+      AudioStream(3, inputQueueArray)
+    { }
+
+    boolean begin(short *delayline_l, short *delayline_r, uint16_t delay_length);
+    virtual void update(void);
+    virtual uint16_t get_delay_length(void);
+
+  private:
+    audio_block_t *inputQueueArray[3];
+    int16_t *_delayline[2];  // pointer for the circular buffer
+    uint16_t _cb_index[2];   // current write pointer of the circular buffer
+    uint16_t _delay_length; // calculated number of samples of the delay
+    int16_t cb_mod_index[2]; // current read pointer with modulation for the circular buffer
+    uint16_t _delay_offset[2];
+};
 #endif