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oscillator.py
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from abc import ABC, abstractmethod
import math
from consts import SAMPLE_RATE
class Oscillator(ABC):
def __init__(self, freq=440, phase=0, amp=1, \
sample_rate=SAMPLE_RATE, wave_range=(-1, 1)):
self._freq = freq
self._amp = amp
self._phase = phase
self._sample_rate = sample_rate
self._wave_range = wave_range
# Properties that will be changed
self._f = freq
self._a = amp
self._p = phase
@property
def init_freq(self):
return self._freq
@property
def init_amp(self):
return self._amp
@property
def init_phase(self):
return self._phase
@property
def freq(self):
return self._f
@freq.setter
def freq(self, value):
self._f = value
self._post_freq_set()
@property
def amp(self):
return self._a
@amp.setter
def amp(self, value):
self._a = value
self._post_amp_set()
@property
def phase(self):
return self._p
@phase.setter
def phase(self, value):
self._p = value
self._post_phase_set()
def _post_freq_set(self):
pass
def _post_amp_set(self):
pass
def _post_phase_set(self):
pass
@abstractmethod
def _initialize_osc(self):
pass
@staticmethod
def squish_val(val, min_val=0, max_val=1):
return (((val + 1) / 2 ) * (max_val - min_val)) + min_val
@abstractmethod
def __next__(self):
return None
def __iter__(self):
self.freq = self._freq
self.phase = self._phase
self.amp = self._amp
self._initialize_osc()
return self
class SineOscillator(Oscillator):
def _post_freq_set(self):
self._step = (2 * math.pi * self._f) / self._sample_rate
def _post_phase_set(self):
self._p = (self._p / 360) * 2 * math.pi
def _initialize_osc(self):
self._i = 0
def __next__(self):
val = math.sin(self._i + self._p)
self._i = self._i + self._step
if self._wave_range is not (-1, 1):
val = self.squish_val(val, *self._wave_range)
return val * self._a
class SquareOscillator(SineOscillator):
def __init__(self, freq=440, phase=0, amp=1, \
sample_rate=SAMPLE_RATE, wave_range=(-1, 1), threshold=0):
super().__init__(freq, phase, amp, sample_rate, wave_range)
self.threshold = threshold
def __next__(self):
val = math.sin(self._i + self._p)
self._i = self._i + self._step
if val < self.threshold:
val = self._wave_range[0]
else:
val = self._wave_range[1]
return val * self._a
class SawtoothOscillator(Oscillator):
def _post_freq_set(self):
self._period = self._sample_rate / self._f
self._post_phase_set
def _post_phase_set(self):
self._p = ((self._p + 90)/ 360) * self._period
def _initialize_osc(self):
self._i = 0
def __next__(self):
div = (self._i + self._p )/self._period
val = 2 * (div - math.floor(0.5 + div))
self._i = self._i + 1
if self._wave_range is not (-1, 1):
val = self.squish_val(val, *self._wave_range)
return val * self._a
class TriangleOscillator(SawtoothOscillator):
def __next__(self):
div = (self._i + self._p)/self._period
val = 2 * (div - math.floor(0.5 + div))
val = (abs(val) - 0.5) * 2
self._i = self._i + 1
if self._wave_range is not (-1, 1):
val = self.squish_val(val, *self._wave_range)
return val * self._a
class WaveAdder:
def __init__(self, *oscillators):
self.oscillators = oscillators
self.n = len(oscillators)
def __iter__(self):
[iter(osc) for osc in self.oscillators]
return self
def __next__(self):
return sum(next(osc) for osc in self.oscillators) / self.n