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from configurations.read_configuration import midi_parameter_range, midi_is_discrete
from data_generation.encoding import ParameterDescription
def get_full_duration(midi):
"""Uses "full_duration" strategy to generate random duration (see Readme)."""
n = len(midi)
(time_starting_point, pitch) = midi[n - 1]
new_midi = [(time_starting_point, pitch, 0.5)]
next_time_starting_point = time_starting_point
for i in range(n - 1):
(time_starting_point, pitch) = midi[n - 2 - i]
duration = (next_time_starting_point - time_starting_point) * 0.9
new_midi.insert(0, (time_starting_point, pitch, duration))
next_time_starting_point = time_starting_point
return new_midi
def get_random_duration(midi):
"""Uses "random_duration" strategy to generate random duration (see Readme)."""
parameterDescription = ParameterDescription(name="duration",
values=midi_parameter_range('duration'),
discrete=midi_is_discrete('duration'))
n = len(midi)
new_midi = []
for i in range(n):
(location, pitch) = midi[i]
duration = float(parameterDescription.generate().value)
new_midi.append((location, pitch, duration))
return new_midi
def get_fixed_duration(midi):
return [(location, pitch, 2.0) for (location, pitch) in midi]
def get_limited_random_duration(midi):
"""Uses "limited_random_duration" strategy to generate random duration (see Readme)."""
parameterDescription = ParameterDescription(name="duration",
values=midi_parameter_range('duration'),
discrete=midi_is_discrete('duration'))
n = len(midi)
(time_starting_point, pitch) = midi[n - 1]
duration = float(parameterDescription.generate().value)
new_midi = [(time_starting_point, pitch, duration)]
next_time_starting_point = time_starting_point
for i in range(n - 1):
(time_starting_point, pitch) = midi[n - 2 - i]
max_duration = (next_time_starting_point - time_starting_point) * 0.9
duration = float(parameterDescription.generate().value)
duration = min(duration, max_duration)
new_midi.insert(0, (time_starting_point, pitch, duration))
next_time_starting_point = time_starting_point
return new_midi
class RandomDuration:
"""Third component in the random midi pipeline responsible for random duration (keyboard hold time) generating"""
def __call__(self, strategy: str, midi, *args, **kwargs):
"""Choose required strategy to generate random duration for each note.
Parameters
----------
strategy: str
Strategy names for random duration (see Readme).
midi: List[(float, float)]
Random rhythm and pitch from previous pipeline component.
Returns
-------
midi: List[(float, float, float)]
Original input list with duration assigned to each note onset.
"""
if strategy == 'random_duration':
midi = get_random_duration(midi)
elif strategy == 'limited_random_duration':
midi = get_limited_random_duration(midi)
elif strategy == 'fixed_duration':
midi = get_fixed_duration(midi)
else:
midi = get_full_duration(midi)
return midi
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