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loop.py
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loop.py
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import asyncio
import functools
import glob
import os
import simpleaudio
DATADIR = 'drumkit'
BPM = 120
BEAT_RESOLUTION = 4
TIME_BETWEEN = 60 / BPM / BEAT_RESOLUTION
def base_path(filename):
basename = os.path.basename(filename)
name, ext = os.path.splitext(basename)
return name
PLAY_SOUNDS = {
base_path(f): simpleaudio.WaveObject.from_wave_file(f)
for f in glob.glob(DATADIR+'/*.wav')
}
def play_sound(sound_name):
sound = PLAY_SOUNDS[sound_name]
sound.play()
DRUM_PATTERN = {
'hhat': [
0, 0, 1, 0,
0, 0, 1, 0,
0, 0, 1, 0,
0, 0, 1, 0,
],
'snare': [
0, 0, 0, 0,
1, 0, 0, 0,
0, 0, 0, 0,
1, 0, 0, 0,
],
'kick': [
1, 0, 0, 0,
0, 0, 1, 0,
1, 0, 0, 0,
0, 0, 0, 0,
],
}
BEATS_IN_PATTERN = len(DRUM_PATTERN['kick'])
def update_pattern(new_drum_pattern):
DRUM_PATTERN.update(new_drum_pattern)
def read_pattern_and_schedule(loop):
for sound, pattern in DRUM_PATTERN.items():
for idx, has_beat in enumerate(pattern):
if has_beat:
loop.call_later(TIME_BETWEEN * idx, functools.partial(play_sound, sound))
loop.call_later(TIME_BETWEEN * (BEATS_IN_PATTERN), read_pattern_and_schedule, loop)
if __name__ == '__main__':
loop = asyncio.get_event_loop()
loop.call_soon(read_pattern_and_schedule, loop)
loop.run_forever()