Audio Recording in Python

python audio-recording microphone alsa pyaudio

jsj · Jul 29, 2011 · Viewed 14k times · Source

I want to record short audio clips from a USB microphone in Python. I have tried pyaudio, which seemed to fail communicating with ALSA, and alsaaudio, the code example of which produces an unreadable files.

So my question: What is the easiest way to record clips from a USB mic in Python?

Answer

This script records to test.wav while printing the current amplitute:

import alsaaudio, wave, numpy

inp = alsaaudio.PCM(alsaaudio.PCM_CAPTURE)
inp.setchannels(1)
inp.setrate(44100)
inp.setformat(alsaaudio.PCM_FORMAT_S16_LE)
inp.setperiodsize(1024)

w = wave.open('test.wav', 'w')
w.setnchannels(1)
w.setsampwidth(2)
w.setframerate(44100)

while True:
    l, data = inp.read()
    a = numpy.fromstring(data, dtype='int16')
    print numpy.abs(a).mean()
    w.writeframes(data)

Audio Recording in Python

Answer

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