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#!/usr/bin/env python3
"""Play a sine signal."""
import argparse
import sys
import numpy as np
import sounddevice as sd
def int_or_str(text):
"""Helper function for argument parsing."""
try:
return int(text)
except ValueError:
return text
parser = argparse.ArgumentParser(add_help=False)
parser.add_argument(
'-l', '--list-devices', action='store_true',
help='show list of audio devices and exit')
args, remaining = parser.parse_known_args()
if args.list_devices:
print(sd.query_devices())
parser.exit(0)
parser = argparse.ArgumentParser(
description=__doc__,
formatter_class=argparse.RawDescriptionHelpFormatter,
parents=[parser])
parser.add_argument(
'frequency', nargs='?', metavar='FREQUENCY', type=float, default=500,
help='frequency in Hz (default: %(default)s)')
parser.add_argument(
'-d', '--device', type=int_or_str,
help='output device (numeric ID or substring)')
parser.add_argument(
'-a', '--amplitude', type=float, default=0.2,
help='amplitude (default: %(default)s)')
args = parser.parse_args(remaining)
start_idx = 0
try:
samplerate = sd.query_devices(args.device, 'output')['default_samplerate']
def callback(outdata, frames, time, status):
if status:
print(status, file=sys.stderr)
global start_idx
t = (start_idx + np.arange(frames)) / samplerate
t = t.reshape(-1, 1)
outdata[:] = args.amplitude * np.sin(2 * np.pi * args.frequency * t)
start_idx += frames
with sd.OutputStream(device=args.device, channels=1, callback=callback,
samplerate=samplerate):
print('#' * 80)
print('press Return to quit')
print('#' * 80)
input()
except KeyboardInterrupt:
parser.exit('')
except Exception as e:
parser.exit(type(e).__name__ + ': ' + str(e))
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