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61 lines
2.4 KiB
61 lines
2.4 KiB
/* Accurate Vibrato object 2
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* Copyright (c) 2020, Mark Tillotson, markt@chaos.org.uk
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*
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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, development funding notice, and this permission
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* notice shall be included in 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 __ACCURATE_VIBRATO2_h__
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#define __ACCURATE_VIBRATO2_h__
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#include <Arduino.h>
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#include <Audio.h>
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#include <AudioStream.h>
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#if AUDIO_BLOCK_SAMPLES != 128
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# error "Only works for AUDIO_BLOCK_SAMPLES == 128 currently"
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#endif
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#define VIBRATO_SINC_SAMPLES 16 // assumed in code to be even
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#define VIBRATO_SINC_SAMPLES_FULL 10 // the range of sinc samples with no tapering applied
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// so the sinc index varies -16 -- +16, with cosine tapering applied outside the range -10 -- +10
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// Reasonable compromise between speed and effect accuracy. For better accuracy use 24 & 16
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// about 10% CPU on 600MHz T4, 40% CPU on 150MHz T4
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class AudioEffectHighQualityVibrato : public AudioStream
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{
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public:
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AudioEffectHighQualityVibrato(void) ;// : AudioStream(1, inputQueueArray) {}
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void modulation (float hertz, float percent) ;
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virtual void update(void);
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private:
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audio_block_t * inputQueueArray[1];
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uint32_t mod_phase_acc ;
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uint32_t mod_phase_inc ;
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float buffer [4 * AUDIO_BLOCK_SAMPLES] ;
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int bptr, cptr ; // circular buffer indices
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float mod_depth ; // fixpoint 8.24 modulation depth in samples, must stay in range -126.0 -> +126.0
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static float cos_table [VIBRATO_SINC_SAMPLES+1] ;
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};
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#endif
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