get-tracks.py

#!/usr/bin/env python
# file: get-tracks.py
# vim:fileencoding=utf-8:fdm=marker:ft=python
#
# Copyright © 2017-2018 R.F. Smith <rsmith@xs4all.nl>.
# SPDX-License-Identifier: MIT
# Created: 2017-09-10T12:15:13+02:00
# Last modified: 2020-12-16T00:25:11+0100
"""Retrieve the numbered tracks from a dvd."""

import logging
import sys
import subprocess as sp

__version__ = "2020.12.16"


def retrieve(dvddev, num):
    """Use `tccat` to retrieve a track from DVD.

    Without the -P argument some DVD's aren't retrieved correctly.

    Arguments:
        dvddev: String containing the device node for the DVD.
        num: The integer number of a track to retrieve.
    """
    args = ["tccat", "-i", dvddev, "-T", f"{num},-1", "-P"]
    trackname = f"track{num:02d}.mpg"
    logging.info(f'writing track {num} as "{trackname}"... ')
    with open(trackname, "wb") as outf:
        sp.run(args, stdout=outf, stderr=sp.DEVNULL)
    logging.info("done.")


# Main program.
logging.basicConfig(level=logging.INFO, format="%(levelname)s: %(message)s")
DVD = "/dev/cd1"
args = sys.argv[1:]
if len(args) == 0:
    print("get-tracks version", __version__)
    print("Example: get-tracks 3 4 5 retrieves tracks 3, 4 and 5")
    exit(0)
# Check for required programs.
try:
    sp.run(["tccat"], stdout=sp.DEVNULL, stderr=sp.DEVNULL)
    logging.info("found “tccat”")
except FileNotFoundError:
    logging.error("the program “tccat” cannot be found")
    sys.exit(1)
# Retrieve tracks.
for a in args:
    try:
        retrieve(DVD, int(a))
    except ValueError:
        print(f'"{a}" is not an integer, skipping')