100 lines
1.9 KiB
C++
100 lines
1.9 KiB
C++
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#ifndef LUPPP_METRONOME_H
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#define LUPPP_METRONOME_H
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#include <cmath>
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#include <iostream>
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#include "buffers.hxx"
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#include "observer/time.hxx"
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using namespace std;
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// simple metronome class
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class Metronome : public TimeObserver
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{
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public:
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Metronome() :
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TimeObserver(),
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playBar (false),
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active (false),
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playPoint (0)
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{
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// create beat and bar samples
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endPoint = (44100.f/441);
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// samples per cycle of
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float scale = 2 * 3.1415 / endPoint;
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// And fill it up
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for(int i=0;i < endPoint*40;i++){
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beatSample[i]= sin(i*scale);
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barSample [i]= sin(i*scale*1.5);
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}
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// don't play after creation
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playPoint = endPoint + 1;
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}
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void setActive(bool a)
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{
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active = a;
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// don't play immidiatly
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playPoint = endPoint + 1;
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}
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void bar()
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{
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playPoint = 0;
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playBar = true;
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}
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void beat()
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{
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playPoint = 0;
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//cout << "Looper " << track << " got beat()" << flush;
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}
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void setFpb(int f)
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{
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fpb = f;
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// disable play until next beat
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playPoint = endPoint + 1;
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}
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void process(int nframes, Buffers* buffers)
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{
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if ( not active )
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return;
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float* outL = buffers->audio[Buffers::MASTER_OUT_L];
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float* outR = buffers->audio[Buffers::MASTER_OUT_R];
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float* sample = &beatSample[0];
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if( playBar ) { sample = &barSample[0]; playBar = false; }
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for(int i = 0; i < nframes; i++)
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{
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if ( playPoint < endPoint )
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{
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outL[i] += sample[playPoint];
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outR[i] += sample[playPoint];
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playPoint++;
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}
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}
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}
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private:
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int fpb;
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bool playBar;
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bool active;
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int playPoint, endPoint;
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float barSample[44100];
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float beatSample[44100];
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};
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#endif // LUPPP_METRONOME_H
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