Added reverb. Extended delay as stereo delay. Small fixes.pull/3/head
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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 <Audio.h> |
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#include "arm_math.h" |
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#include "effect_modulated_delay.h" |
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#include "config.h" |
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extern config_t configuration; |
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/******************************************************************/ |
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// Based on; A u d i o E f f e c t D e l a y
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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 - added modulation input (by Holger Wirtz)
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boolean AudioEffectModulatedDelay::begin(short *delayline, uint16_t d_length) |
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{ |
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#if 0 |
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Serial.print(F("AudioEffectModulatedDelay.begin(modulated-delay line length = ")); |
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Serial.print(d_length); |
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Serial.println(F(")")); |
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#endif |
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_delayline = NULL; |
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_delay_length = 0; |
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_cb_index = 0; |
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_delay_offset = 0; |
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if (delayline == NULL) |
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return (false); |
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if (d_length < 10) |
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return (false); |
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_delayline = delayline; |
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_delay_length = d_length; |
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memset(_delayline, 0, _delay_length * sizeof(int16_t)); |
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_delay_offset = _delay_length >> 1 ; |
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return (true); |
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} |
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uint16_t AudioEffectModulatedDelay::get_delay_length(void) |
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{ |
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return (_delay_length); |
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} |
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void AudioEffectModulatedDelay::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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if (_delayline == NULL) |
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return; |
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block = receiveWritable(0); |
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modulation = receiveReadOnly(1); |
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if (block && modulation) |
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{ |
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int16_t *bp; |
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int16_t cb_mod_index_neighbor; |
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float *mp; |
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float mod_index; |
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float mod_number; |
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float mod_fraction; |
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float modulation_f32[AUDIO_BLOCK_SAMPLES]; |
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bp = block->data; |
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arm_q15_to_float(modulation->data, modulation_f32, AUDIO_BLOCK_SAMPLES); |
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mp = modulation_f32; |
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for (uint16_t i = 0; i < AUDIO_BLOCK_SAMPLES; i++) |
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{ |
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// write data into circular buffer (delayline)
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if (_cb_index >= _delay_length) |
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_cb_index = 0; |
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_delayline[_cb_index] = *bp; |
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// calculate the modulation-index as a floating point number for interpolation
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mod_index = *mp * _delay_offset; |
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mod_fraction = modff(mod_index, &mod_number); // split float of mod_index into integer (= mod_number) and fraction part
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// calculate modulation index into circular buffer
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cb_mod_index = _cb_index - (_delay_offset + mod_number); |
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if (cb_mod_index < 0) // check for negative offsets and correct them
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cb_mod_index += _delay_length; |
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if (cb_mod_index == _delay_length - 1) |
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cb_mod_index_neighbor = 0; |
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else |
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cb_mod_index_neighbor = cb_mod_index + 1; |
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*bp = round(float(_delayline[cb_mod_index]) * mod_fraction + float(_delayline[cb_mod_index_neighbor]) * (1.0 - mod_fraction)); |
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// push the pointers forward
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bp++; // next audio data
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mp++; // next modulation data
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_cb_index++; // next circular buffer index
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} |
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} |
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if (modulation) |
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release(modulation); |
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if (block) |
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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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} |
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@ -0,0 +1,58 @@ |
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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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#include "config.h" |
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/*************************************************************************/ |
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// A u d i o E f f e c t M o d u l a t e d D e l a y
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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 - added modulation input handling (Aug 2019 by Holger Wirtz)
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class AudioEffectModulatedDelay : |
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public AudioStream |
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{ |
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public: |
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AudioEffectModulatedDelay(void): |
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AudioStream(2, inputQueueArray) |
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{ } |
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boolean begin(short *delayline, uint16_t delay_length); |
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virtual void update(void); |
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virtual uint16_t get_delay_length(void); |
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private: |
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audio_block_t *inputQueueArray[2]; |
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int16_t *_delayline; // pointer for the circular buffer
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uint16_t _cb_index; // current write pointer of the circular buffer
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uint16_t _delay_length; // calculated number of samples of the delay
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int16_t cb_mod_index; // current read pointer with modulation for the circular buffer
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uint16_t _delay_offset; |
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}; |
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#endif |
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