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#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Copyright (C) 2022-2022 kcgen <kcgen@users.noreply.github.com>
# Bash strict-mode
set -euo pipefail
IFS=$'\n\t'
print_usage() {
local script="${0##*/}"
echo ""
echo "usage: $script URI [URI [...]]"
echo
echo "Convert a YouTube playlist into CD-DA track format."
echo " - Multiple playlists can be provided; each will be converted."
echo " - URIs can be the full https:// URL or just the identifier."
echo ""
echo "Depends on:"
echo " - yt-dlp (install with pip3 install yt-dlp)"
echo " - ffmpeg: install with package manager"
echo ""
}
main() {
case ${1:--help} in
-h | -help | --help) print_usage ;;
*)
check-dependencies
convert-playlists-to-tracks "$@"
;;
esac
}
check-dependencies() {
local missing_deps=0
for dep in yt-dlp ffmpeg find sort rm; do
if ! command -v "$dep" &>/dev/null; then
echo "Missing dependency: $dep could not be found in the PATH"
((missing_deps++))
fi
done
# Were any missing?
if [[ $missing_deps -gt 0 ]]; then
echo "Install the above programs and try again"
exit 1
fi
}
download-playlist-from-uri() {
# YouTube Opus format identifiers in order of quality
local webm_formats="338/251/250/249"
# Playlist/##-Track output layout
local cdda_ouput="%(playlist|)s/%(playlist_index)03d-%(title)s.%(ext)s"
yt-dlp \
--restrict-filenames \
--format "$webm_formats" \
--output "$cdda_ouput" \
"$uri" || true
}
extract-opus-from-webm() {
local opus="${webm%.webm}.opus"
ffmpeg \
-hide_banner \
-loglevel error \
-i "$webm" \
-vn -acodec copy "$opus"
# Delete the WebM source if we've got the Opus
if [[ -f $opus ]]; then
rm "$webm"
fi
}
convert-playlists-to-tracks() {
for uri in "$@"; do
download-playlist-from-uri
done
for webm in $(find . -maxdepth 2 -mindepth 2 -name '*.webm' | sort || true); do
extract-opus-from-webm
done
}
main "$@"
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