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#! /usr/bin/env python
import alsaaudio
import numpy as np
import aubio
# constants
samplerate = 44100
win_s = 2048
hop_s = win_s // 2
framesize = hop_s
# set up audio input
recorder = alsaaudio.PCM(type=alsaaudio.PCM_CAPTURE)
recorder.setperiodsize(framesize)
recorder.setrate(samplerate)
recorder.setformat(alsaaudio.PCM_FORMAT_FLOAT_LE)
recorder.setchannels(1)
# create aubio pitch detection (first argument is method, "default" is
# "yinfft", can also be "yin", "mcomb", fcomb", "schmitt").
pitcher = aubio.pitch("default", win_s, hop_s, samplerate)
# set output unit (can be 'midi', 'cent', 'Hz', ...)
pitcher.set_unit("Hz")
# ignore frames under this level (dB)
pitcher.set_silence(-40)
print("Starting to listen, press Ctrl+C to stop")
# main loop
while True:
try:
# read data from audio input
_, data = recorder.read()
# convert data to aubio float samples
samples = np.fromstring(data, dtype=aubio.float_type)
# pitch of current frame
freq = pitcher(samples)[0]
# compute energy of current block
energy = np.sum(samples**2)/len(samples)
# do something with the results
print("{:10.4f} {:10.4f}".format(freq,energy))
except KeyboardInterrupt:
print("Ctrl+C pressed, exiting")
break
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