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/* Audio Library for Teensy 3.X
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Copyright (c) 2014, Pete (El Supremo) |
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Copyright (c) 2019, Holger Wirtz |
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Permission is hereby granted, free of charge, to any person obtaining a copy |
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of this software and associated documentation files (the "Software"), to deal |
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in the Software without restriction, including without limitation the rights |
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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copies of the Software, and to permit persons to whom the Software is |
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furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included in |
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all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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THE SOFTWARE. |
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*/ |
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#include <Arduino.h> |
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#include "effect_modulated_chorus.h" |
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/******************************************************************/ |
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// Based on; A u d i o E f f e c t C h o r u s
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// Written by Pete (El Supremo) Jan 2014
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// 140529 - change to handle mono stream - change modify() to voices()
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// 140219 - correct storage class (not static)
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// 190527 - adding modulation input (by Holger Wirtz)
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boolean AudioModulatedEffectChorus::begin(short *delayline, int d_length, int n_chorus) |
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{ |
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#if 0 |
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Serial.print("AudioModulatedEffectChorus.begin(Chorus delay line length = "); |
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Serial.print(d_length); |
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Serial.print(", n_chorus = "); |
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Serial.print(n_chorus); |
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Serial.println(")"); |
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#endif |
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l_delayline = NULL; |
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delay_length = 0; |
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l_circ_idx = 0; |
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if (delayline == NULL) { |
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return (false); |
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} |
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if (d_length < 10) { |
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return (false); |
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} |
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if (n_chorus < 1) { |
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return (false); |
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} |
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l_delayline = delayline; |
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delay_length = d_length / 2; |
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num_chorus = n_chorus; |
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return (true); |
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} |
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void AudioModulatedEffectChorus::voices(int n_chorus) |
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{ |
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num_chorus = n_chorus; |
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} |
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//int last_idx = 0;
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void AudioModulatedEffectChorus::update(void) |
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{ |
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audio_block_t *block; |
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audio_block_t *modulation; |
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short *bp; |
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int sum; |
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int c_idx; |
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if (l_delayline == NULL)return; |
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// do passthru
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// It stores the unmodified data in the delay line so that
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// it isn't as likely to click
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if (num_chorus <= 1) { |
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// Just passthrough
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block = receiveWritable(0); |
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if (block) { |
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bp = block->data; |
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for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) { |
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l_circ_idx++; |
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if (l_circ_idx >= delay_length) { |
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l_circ_idx = 0; |
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} |
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l_delayline[l_circ_idx] = *bp++; |
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} |
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transmit(block, 0); |
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release(block); |
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} |
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return; |
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} |
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// L E F T C H A N N E L
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block = receiveWritable(0); |
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modulation = receiveReadOnly(1); |
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if (block) { |
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bp = block->data; |
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uint32_t tmp = delay_length / (num_chorus - 1) - 1; |
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for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) { |
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l_circ_idx++; |
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if (l_circ_idx >= delay_length) { |
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l_circ_idx = 0; |
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} |
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l_delayline[l_circ_idx] = *bp; |
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sum = 0; |
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c_idx = l_circ_idx; |
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for (int k = 0; k < num_chorus; k++) { |
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sum += l_delayline[c_idx]; |
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if (num_chorus > 1)c_idx -= tmp; |
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if (c_idx < 0) { |
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c_idx += delay_length; |
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} |
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} |
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*bp++ = sum / num_chorus; |
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} |
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// transmit the block
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transmit(block, 0); |
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release(block); |
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release(modulation); |
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} |
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} |
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@ -0,0 +1,60 @@ |
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/* Audio Library for Teensy 3.X
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Copyright (c) 2014, Pete (El Supremo) |
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Copyright (c) 2019, Holger Wirtz |
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Permission is hereby granted, free of charge, to any person obtaining a copy |
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of this software and associated documentation files (the "Software"), to deal |
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|
in the Software without restriction, including without limitation the rights |
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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copies of the Software, and to permit persons to whom the Software is |
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furnished to do so, subject to the following conditions: |
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|
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The above copyright notice and this permission notice shall be included in |
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all copies or substantial portions of the Software. |
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|
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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THE SOFTWARE. |
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*/ |
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#ifndef effect_modulated_chorus_h_ |
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#define effect_modulated_chorus_h_ |
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#include "Arduino.h" |
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#include "AudioStream.h" |
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/******************************************************************/ |
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// A u d i o E f f e c t C h o r u s
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// Written by Pete (El Supremo) Jan 2014
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// 140219 - correct storage class (not static)
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// 190527 - adding modulation input (by Holger Wirtz)
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#define CHORUS_DELAY_PASSTHRU -1 |
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class AudioModulatedEffectChorus : |
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public AudioStream |
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{ |
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public: |
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AudioModulatedEffectChorus(void): |
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AudioStream(2, inputQueueArray), num_chorus(2) |
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{ } |
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boolean begin(short *delayline, int delay_length, int n_chorus); |
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virtual void update(void); |
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void voices(int n_chorus); |
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private: |
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audio_block_t *inputQueueArray[2]; |
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short *l_delayline; |
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short l_circ_idx; |
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int num_chorus; |
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int delay_length; |
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}; |
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#endif |
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