66 lines
1.7 KiB
Python
66 lines
1.7 KiB
Python
import sys
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sys.path.insert(
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0, f"{__file__.rpartition('/')[0] or '.'}/../../../../frozen/Adafruit_CircuitPython_Wave"
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)
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import audiocore
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import synthio
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from ulab import numpy as np
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import adafruit_wave as wave
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SAMPLE_SIZE = 1024
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VOLUME = 32700
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sine = np.array(
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np.sin(np.linspace(0, 2 * np.pi, SAMPLE_SIZE, endpoint=False)) * VOLUME,
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dtype=np.int16,
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)
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envelope = synthio.Envelope(
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attack_time=0.1, decay_time=0.05, release_time=0.2, attack_level=1, sustain_level=0.8
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)
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melody = synthio.MidiTrack(
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b"\0\x90H\0*\x80H\0\6\x90J\0*\x80J\0\6\x90L\0*\x80L\0\6\x90J\0"
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+ b"*\x80J\0\6\x90H\0*\x80H\0\6\x90J\0*\x80J\0\6\x90L\0T\x80L\0"
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+ b"\x0c\x90H\0T\x80H\0\x0c\x90H\0T\x80H\0",
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tempo=240,
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sample_rate=48000,
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waveform=sine,
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envelope=envelope,
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)
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# sox -r 48000 -e signed -b 16 -c 1 tune.raw tune.wav
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with wave.open("tune.wav", "w") as f:
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f.setnchannels(1)
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f.setsampwidth(2)
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f.setframerate(48000)
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while True:
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result, data = audiocore.get_buffer(melody)
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if data is None:
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break
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f.writeframes(data)
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if result != 1:
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break
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melody = synthio.MidiTrack(
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b"\0\x90H\0*\x80H\0\6\x90J\0*\x80J\0\6\x90L\0*\x80L\0\6\x90J\0"
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+ b"*\x80J\0\6\x90H\0*\x80H\0\6\x90J\0*\x80J\0\6\x90L\0T\x80L\0"
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+ b"\x0c\x90H\0T\x80H\0\x0c\x90H\0T\x80H\0",
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tempo=240,
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sample_rate=48000,
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waveform=sine,
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)
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# sox -r 48000 -e signed -b 16 -c 1 tune.raw tune.wav
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with wave.open("tune-noenv.wav", "w") as f:
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f.setnchannels(1)
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f.setsampwidth(2)
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f.setframerate(48000)
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while True:
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result, data = audiocore.get_buffer(melody)
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if data is None:
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break
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f.writeframes(data)
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if result != 1:
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break
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