【PyAudio】波形の音声を出力する

PyAudioを用いて、波形の音声をそのまま出力する。

import numpy as np
import matplotlib.pyplot as plt
import struct
import pyaudio

a = 0.1
f0 = 440
fs = 44100
sec = 3
CHUNK = 1024

n = np.arange(fs * sec)
s = a * np.sin(2.0 * np.pi * f0 * n / fs)

plt.plot(s[:int(fs/f0)])
plt.show()

s = [int(x * 32767.0) for x in s]
bin = struct.pack('h' * len(s), *s)

p = pyaudio.PyAudio()
stream = p.open(format=pyaudio.paInt16,
                channels=1,
                rate=fs,
                output=True)

sp = 0
data = bin[sp:sp+CHUNK*2]
while len(data) > 0:
  stream.write(data)
  sp = sp + CHUNK*2
  data = bin[sp:sp+CHUNK*2]

stream.stop_stream()
stream.close()
p.terminate()

参考

PyAudio Documentation — PyAudio 0.2.14 documentation