class Sound:
"""Generate sound. Requires PyAudio & NumPy."""
def __init__(self, rate=44100, channels=1):
# Suppress Jack and ALSA error messages on Linux: https://github.com/rtmrtmrtmrtm/weakmon/blob/master/weakaudio.py
nullfd = os.open("/dev/null", 1)
oerr = os.dup(2)
os.dup2(nullfd, 2)
self.stream = PyAudio().open(format=paFloat32, channels=channels, rate=rate, output=True)
os.dup2(oerr, 2)
os.close(oerr)
os.close(nullfd)
return
def play(self, frequency=440, length=1.0, volume=1.0, rate=44100):
"""Play sine wave at frequency, for length, at rate parameters values."""
self.stream.stop_stream()
self.stream.start_stream()
wave = concatenate(
[sin(arange(length * rate) * frequency * pi * 2 / rate)]) * volume
self.stream.write(wave.astype(float32).tostring())
return
class Audio:
def __init__(self):
self.RATE = 44100
self.BPM = 100
self.L1 = (60 / self.BPM * 4) * self.RATE
self.L2 = self.L1 / 2
self.L4 = self.L1 / 4
self.L8 = self.L1 / 8
self.stream = None
def open(self):
self.stream = PyAudio().open(format=paFloat32,
channels=1,
rate=self.RATE,
frames_per_buffer=1024,
output=True)
def play(self, freq, length):
t = float(freq) * np.pi * 2 / self.RATE
s = np.sin(np.arange(length) * t)
self.stream.write(s.astype(np.float32).tostring())
def close(self):
self.stream.close()