oscillator.cpp

#include "oscillator.h"
#include <stdio.h>

Oscillator::Oscillator(WaveTable *waveTable, waveformType waveform, double freq)
    : waveTable(waveTable) {
  this->waveform = waveform;
  period = SAMPLE_RATE / freq;
  phase = 0;
  pthread_mutex_init(&setFreqMutex, NULL);
  pthread_mutex_init(&setWaveformMutex, NULL);
}

void Oscillator::setFreq(double freq) {
  pthread_mutex_lock(&setFreqMutex);
  double newPeriod;
  newPeriod = SAMPLE_RATE / freq;
  phase = phase * (newPeriod / period);
  period = newPeriod;
  pthread_mutex_unlock(&setFreqMutex);
}

void Oscillator::advance() {
  phase += 1;
  if (phase >= period - 0.001) {
    phase -= period;
  }
}

double Oscillator::getSample() {
  pthread_mutex_lock(&setFreqMutex);
  double sample;
  pthread_mutex_lock(&setWaveformMutex);
  sample = (waveTable->*waveform)(phase, SAMPLE_RATE / period);
  pthread_mutex_unlock(&setWaveformMutex);
  advance();
  pthread_mutex_unlock(&setFreqMutex);
  return sample;
}

void Oscillator::setWaveform(waveformType waveform) {
  pthread_mutex_lock(&setWaveformMutex);
  this->waveform = waveform;
  pthread_mutex_unlock(&setWaveformMutex);
}