49 lines
1.1 KiB
Python
49 lines
1.1 KiB
Python
import sys
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import ctypes
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import math
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import time
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import struct
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import sdl2
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import sdl2.sdlmixer as mixer
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def create_sound(frequency, duration):
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"""Create a buffer with sound at given frequency and duration"""
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num_samples = int(48000 * duration)
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wave = struct.pack(
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f"<{num_samples}i",
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*[
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int(2**30 * math.sin(2 * math.pi * frequency / 48000 * t))
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for t in range(num_samples)
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]
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)
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length = num_samples * 4
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sound_buffer = (ctypes.c_ubyte * length).from_buffer_copy(wave)
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sound = mixer.Mix_QuickLoad_RAW(
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ctypes.cast(sound_buffer, ctypes.POINTER(ctypes.c_ubyte)), length
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)
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return sound
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def main():
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"""Play sine wave"""
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mixer.Mix_Init(0)
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mixer.Mix_OpenAudioDevice(48000, sdl2.AUDIO_S32, 1, 2048, None, 0)
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note = 261.63
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semitone = math.pow(2, 1 / 12)
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duration = 0.5 # seconds
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for step in [0, 2, 2, 1, 2, 2, 2, 1]:
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note *= semitone**step
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sound = create_sound(note, duration)
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mixer.Mix_PlayChannel(0, sound, 1)
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time.sleep(duration)
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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