weird-drums.h

#include "LiveAudio.h"
#include <math.h>
#include <stdlib.h>

class MyLiveAudio : public LiveAudio {
public:

	float random() {
		return (rand() %10000) / 5000.f - 1.f;
	}
	

	int pos = 0;
	float freq = 400;
	float phase = 0;
	float env = 0;
	int beat = 0;
	float decay = 0.999;
	float freqDecay = 1;
	float noiz = 0.f;


	// 2 controls
	// 1 - weirdness
	// 2 - business
	float frac(float f) {
		return f - (int)f;
	}

	float business = 0.5;
	float weirdness = 0.5f;

	float getSample() {
		
		pos++;

		if(pos>7000) {
			beat = (beat+1)%16;

			int seed = 4236+ beat*123;//(1 + 13323*beat);

			if(frac(seed*1.3495) < business) {

				freq = 11 + 3 * (seed%12)*weirdness;
				env = 0.1f + frac(seed * 0.844574)*0.2;
				decay = 1.f - pow(0.1, 3 + 2*frac(seed*0.6));

				freqDecay = 1.f + pow(0.1, 4 + 3*frac(seed*0.9));
				
				if(frac(seed*193.99343)>0.5) {	
					freqDecay = 2.f - freqDecay;
				}

				phase = 0;
				noiz = 0.5f * (seed & 1);
			}
			pos = 0;
		}


		env *= decay;
		freq *= freqDecay;//1.00001;
		phase += freq * 0.0002;
		phase -= (int) phase;


		float out = 0;


		if(phase<0.5) out = phase * 4.f - 1.f;
		else out = 1.f - (phase - 0.5f)*4.f;
		out = noiz * random() + (1.f - noiz) *out;
		//out *= noiz * random() + (1.f - noiz);
	
		out = tanh(out*env*40.f);
		return out * env;
	}




	void audioOut(float *samples, int length, int numChans) override {
		for(int i = 0; i < length; i++) {
			float out = getSample();
			samples[i*2] = samples[i*2+1] = out;
		}
	}	
};