#!/usr/bin/python3
#
# Copyright 2004,2005,2007 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#

from gnuradio import gr
from gnuradio import audio
from gnuradio.eng_arg import eng_float
from argparse import ArgumentParser


class my_top_block(gr.top_block):

    def __init__(self):
        gr.top_block.__init__(self)

        parser = ArgumentParser()
        parser.add_argument("-I", "--audio-input", default="",
                            help="pcm input device name.  E.g., hw:0,0 or /dev/dsp")
        parser.add_argument("-O", "--audio-output", default="",
                            help="pcm output device name.  E.g., hw:0,0 or /dev/dsp")
        parser.add_argument("-r", "--sample-rate", type=eng_float, default=48000,
                            help="set sample rate, default=%(default)s")
        args = parser.parse_args()

        sample_rate = int(args.sample_rate)
        src = audio.source(sample_rate, args.audio_input)
        dst = audio.sink(sample_rate, args.audio_output)

        # Determine the maximum number of outputs on the source and
        # maximum number of inputs on the sink, then connect together
        # the most channels we can without overlap
        nchan = min(src.output_signature().max_streams(),
                    dst.input_signature().max_streams())

        for i in range(nchan):
            self.connect((src, i), (dst, i))


if __name__ == '__main__':
    try:
        my_top_block().run()
    except KeyboardInterrupt:
        pass
