radio-monitoring/barker/make-barker-audios.py

#!/usr/bin/python3
"""
This script creates useful barker code files
"""

import subprocess
import argparse
from logging import basicConfig

from barker import BARKERS


def get_parser():
    p = argparse.ArgumentParser()
    p.add_argument("fname")
    p.add_argument(
        "--barker-sequence-length", type=int, default=5, choices=BARKERS.keys()
    )
    p.add_argument(
        "--barker-freq-1", default=1000, type=int, help='Known as "+1" in barker code'
    )
    p.add_argument(
        "--barker-freq-2", default=500, type=int, help='Known as "-1" in barker code'
    )
    p.add_argument("--duration", default=100, type=int)

    p.add_argument(
        "--log-level",
        default="WARNING",
        choices=["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"],
    )
    return p


def compress(seq):
    """
    Make repetition more explicit

    >>> compress([1,1,10,100,100,100])
    [[2, 1], [1, 10], [3, 100]]
    """
    if not seq:
        return []
    out = [[1, seq[0]]]
    for elem in seq[1:]:
        if elem == out[-1][1]:
            out[-1][0] += 1
        else:
            out.append([1, elem])

    return out


def main():
    args = get_parser().parse_args()
    basicConfig(level=args.log_level)
    barker_sequence = BARKERS[args.barker_sequence_length]
    barker_seq_duration = compress(barker_sequence)
    synth = []
    symbol_map = {1: str(args.barker_freq_1), -1: str(args.barker_freq_2)}
    for howmany, symbol in barker_seq_duration:
        freq = symbol_map[symbol]
        part = ["synth", "%.2f" % (howmany * args.duration / 1000.0), "sin", freq, ":"]
        synth.extend(part)
    synth.pop()  # remove trailing colon
    cmd = ["sox", "-n", args.fname] + synth
    subprocess.check_call(cmd)


if __name__ == "__main__":
    main()