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