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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?
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The python-sounddevice and pyaudio libraries provide ways to record audio with Python. python-sounddevice records to NumPy arrays and pyaudio records to bytes objects. Both of these can be stored as WAV files using the scipy and wave libraries, respectively.
It also provides Python bindings for PortAudio, the cross-platform audio I/O library as provided by python-sounddevice. With PyAudio, you can easily use Python to play and record audio on a variety of platform. Use Up/Down Arrow keys to increase or decrease volume. Now just switching to the recording mode of the article.
playsound is a “pure Python, cross platform, single function module with no dependencies for playing sounds.” With this module, you can play a sound file with a single line of code: from playsound import playsound playsound('myfile.wav')
Pydub is quite a popular library, as it isn't only for playing sound, you can use it for different purposes, such as converting audio files, slicing audio, boosting or reducing volume, and much more, check their repository for more information. If you wish to play audio using PyAudio, check this link.
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)
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