96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/* Audio Library for Teensy 3.X
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* Copyright (c) 2016, Byron Jacquot, SparkFun Electronics
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*
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* Development of this audio library was funded by PJRC.COM, LLC by sales of
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
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* open source software by purchasing Teensy or other PJRC products.
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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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#pragma once
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#ifndef _SYNTH_SIMPLE_DRUM_H_
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#define _SYNTH_SIMPLE_DRUM_H_
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#include "AudioStream.h"
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#include "utility/dspinst.h"
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class AudioSynthSimpleDrum : public AudioStream
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{
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public:
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AudioSynthSimpleDrum() : AudioStream(1, inputQueueArray)
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{
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length(600);
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frequency(60);
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pitchMod(0x200);
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wav_amplitude1 = 0x7fff;
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wav_amplitude2 = 0;
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}
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void noteOn();
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void frequency(float freq)
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{
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if(freq < 0.0)
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freq = 0;
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else if(freq > (AUDIO_SAMPLE_RATE_EXACT/2))
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freq = AUDIO_SAMPLE_RATE_EXACT/2;
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wav_increment = (freq * (0x7fffffffLL/AUDIO_SAMPLE_RATE_EXACT)) + 0.5;
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}
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void length(int32_t milliseconds)
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{
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if(milliseconds < 0)
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return;
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if(milliseconds > 5000)
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milliseconds = 5000;
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int32_t len_samples = milliseconds*(AUDIO_SAMPLE_RATE_EXACT/1000.0);
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env_decrement = (0x7fff0000/len_samples);
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};
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void secondMix(float level);
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void pitchMod(float depth);
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using AudioStream::release;
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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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// Envelope params
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int32_t env_lin_current; // present value of linear slope.
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int32_t env_decrement; // how each sample deviates from previous.
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// Waveform params
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uint32_t wav_phasor;
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uint32_t wav_phasor2;
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int16_t wav_amplitude1;
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int16_t wav_amplitude2;
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uint32_t wav_increment;
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int32_t wav_pitch_mod;
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};
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#endif
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