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https://github.com/DJ2LS/FreeDATA
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48 lines
1.1 KiB
Python
48 lines
1.1 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# Throw away test program to help understand the care and feeding of PyAudio
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import numpy as np
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import pyaudio
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CHUNK = 1024
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FS48 = 48000
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FTEST = 800
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AMP = 16000
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def test_pa():
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# 1. play sine wave out of default sound device
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p_audio = pyaudio.PyAudio()
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stream = p_audio.open(
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format=pyaudio.paInt16,
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channels=1,
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rate=FS48,
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frames_per_buffer=CHUNK,
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output=True,
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)
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with open("out48.raw", mode="wb") as f48:
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temp = 0
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for _ in range(50):
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sine_48k = (
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AMP * np.cos(2 * np.pi * np.arange(temp, temp + CHUNK) * FTEST / FS48)
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).astype(np.int16)
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temp += CHUNK
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sine_48k.tofile(f48)
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stream.write(sine_48k.tobytes())
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sil_48k = np.zeros(CHUNK, dtype=np.int16)
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for _ in range(50):
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sil_48k.tofile(f48)
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stream.write(sil_48k)
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stream.stop_stream()
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stream.close()
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p_audio.terminate()
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if __name__ == "__main__":
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test_pa()
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