utils

#! /usr/bin/env bash

mcc() {
	local list=( *.list )
	if [[ ${#list[@]} -ne 1 ]]; then
		echo "Number of .list files in cwd must be exactly 1, exiting."
		return 1
	fi
	make_cuts "$list" "$@"
	concat CUT -c copy "CONCAT_${list%.*}"
}

concat() {
	if [[ $# -eq 0 ]]; then
		echo "You must provide a prefix"
		return
	fi

	local prefix="$1"
	shift
	ffmpeg -y -f concat -safe 0 -i <(printf 'file %q\n' "$PWD"/"$prefix"*) "$@"
}

make_cuts() {
	if [[ $1 != *".list" ]]; then
		echo "You must supply a single .list file as argument"
		return
	fi

	local list="$1"
	local vid="${list%.*}"
	local ext="${vid##*.}"
	local vid_noext="${vid%.*}"
	local start_ts_hms
	local end_ts_hms
	local ffmpeg_cmd=("ffmpeg" "-y" "-i" "$vid")
	shift

	while IFS=: read -r channel_name start_ts end_ts || [[ -n "$channel_name" ]]; do
		if [[ -z "$end_ts" ]]; then continue; fi
		start_ts_hms="$(_mpv_cut_to_hms "$start_ts")"
		end_ts_hms="$(_mpv_cut_to_hms "$end_ts")"
		ffmpeg_cmd+=("-ss" "$start_ts" "-to" "$end_ts" "$@" "CUT_${channel_name}_${vid_noext}_${start_ts_hms}_${end_ts_hms}.${ext}")
	done < "$list"

	"${ffmpeg_cmd[@]}"
}

_mpv_cut_to_hms() {
	local total_seconds="$1"
	local hours=$(( ${total_seconds%.*} / 3600 ))
	local minutes=$(( (${total_seconds%.*} % 3600) / 60 ))
	local seconds=$(( ${total_seconds%.*} % 60 ))
	local ms
	ms=$(printf "%.0f" "$(echo "($total_seconds - ${total_seconds%.*}) * 1000" | bc)")
	printf "%02d-%02d-%02d-%03d\n" $hours $minutes $seconds "$ms"
}