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#!/usr/bin/env python3
"""Pass input directly to output.
https://github.com/PortAudio/portaudio/blob/master/test/patest_wire.c
"""
import argparse
import sounddevice as sd
import numpy # Make sure NumPy is loaded before it is used in the callback
assert numpy # avoid "imported but unused" message (W0611)
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(
'-i', '--input-device', type=int_or_str,
help='input device (numeric ID or substring)')
parser.add_argument(
'-o', '--output-device', type=int_or_str,
help='output device (numeric ID or substring)')
parser.add_argument(
'-c', '--channels', type=int, default=2,
help='number of channels')
parser.add_argument('--dtype', help='audio data type')
parser.add_argument('--samplerate', type=float, help='sampling rate')
parser.add_argument('--blocksize', type=int, help='block size')
parser.add_argument('--latency', type=float, help='latency in seconds')
args = parser.parse_args(remaining)
def callback(indata, outdata, frames, time, status):
if status:
print(status)
outdata[:] = indata
try:
with sd.Stream(device=(args.input_device, args.output_device),
samplerate=args.samplerate, blocksize=args.blocksize,
dtype=args.dtype, latency=args.latency,
channels=args.channels, callback=callback):
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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