72 lines
2.1 KiB
C++
Executable File
72 lines
2.1 KiB
C++
Executable File
//Envelopes allow you to shape the sound. The basic idea is that a sound has the following shape
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// Attack: This is how long it takes to fade up to maximum volume
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// Decay: This is how long it takes to reach the sustain level.
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// Sustain: This is the sustain level
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// Release: This is how long it takes to fade out.
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#include "AudioTools.h"
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#include "AudioTools/AudioLibs/MaximilianDSP.h"
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// Define Arduino output
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I2SStream out;
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Maximilian maximilian(out);
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// Maximilian
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maxiOsc myCounter,mySwitchableOsc;//
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int CurrentCount;//
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double myOscOutput,myCurrentVolume;//
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maxiEnv myEnvelope;
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void setup() {//some inits
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// setup logging
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Serial.begin(115200);
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AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
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// setup audio output
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auto cfg = out.defaultConfig(TX_MODE);
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out.begin(cfg);
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maximilian.begin(cfg);
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//Timing is in ms
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myEnvelope.setAttack(0);
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myEnvelope.setDecay(1); // Needs to be at least 1
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myEnvelope.setSustain(1);
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myEnvelope.setRelease(1000);
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}
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void play(float *output) {
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//notice that we feed in a value of 1. to create an envelope shape we can apply later.
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myCurrentVolume=myEnvelope.adsr(1.,myEnvelope.trigger);
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CurrentCount=myCounter.phasorBetween(1, 1, 9);//phasor can take three arguments; frequency, start value and end value.
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// You'll notice that these 'if' statements don't require curly braces "{}".
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// This is because there is only one outcome if the statement is true.
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if (CurrentCount==1) myEnvelope.trigger=1; //trigger the envelope
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else myEnvelope.trigger=0;//release the envelope to make it fade out only if it's been triggered
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if (CurrentCount<5)
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myOscOutput=mySwitchableOsc.sawn(CurrentCount*100);
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else if (CurrentCount>=5)//and the 'else' bit.
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myOscOutput=mySwitchableOsc.sinewave(CurrentCount*50);//one osc object can produce whichever waveform you want.
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output[0]=myOscOutput*myCurrentVolume;//left speaker
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output[1]=output[0];
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}
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// Arduino loop
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void loop() {
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maximilian.copy();
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}
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