poem_recording_01.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
AUTHOR: Matthias Geier
PURPOSE: Create a recording with arbitrary duration
LICENSE: MIT
SOURCE: https://python-sounddevice.readthedocs.io/en/0.3.12/examples.html
DEPENDENCIES: sounddevice and PySoundFile
"""

import argparse
import tempfile
import queue
import sys

def int_or_str(text):
    """Helper function for argument parsing."""
    try:
        return int(text)
    except ValueError:
        return text

parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument(
    '-l', '--list-devices', action='store_true',
    help='show list of audio devices and exit')
parser.add_argument(
    '-d', '--device', type=int_or_str,
    help='input device (numeric ID or substring)')
parser.add_argument(
    '-r', '--samplerate', type=int, help='sampling rate')
parser.add_argument(
    '-c', '--channels', type=int, default=1, help='number of input channels')
parser.add_argument(
    'filename', nargs='?', metavar='FILENAME',
    help='audio file to store recording to')
parser.add_argument(
    '-t', '--subtype', type=str, help='sound file subtype (e.g. "PCM_24")')
args = parser.parse_args()

try:
    import sounddevice as sd
    import soundfile as sf
    import numpy  # Make sure NumPy is loaded before it is used in the callback
    assert numpy  # avoid "imported but unused" message (W0611)

    if args.list_devices:
        print(sd.query_devices())
        parser.exit(0)
    if args.samplerate is None:
        device_info = sd.query_devices(args.device, 'input')
        # soundfile expects an int, sounddevice provides a float:
        args.samplerate = int(device_info['default_samplerate'])
    if args.filename is None:
        args.filename = tempfile.mktemp(prefix='delme_rec_unlimited_',
                                        suffix='.wav', dir='')
    q = queue.Queue()

def callback(indata, frames, time, status):