#!/bin/bash

# 2025, writen mostly by chatgpt

# toALAC with concurrency
# usage: toALAC *.wav

trap "echo -e '\nAborted by user.'; kill 0" INT

if [ $# -eq 0 ]; then
    echo "Usage: toALAC *.wav"
    exit 1
fi

MAX_JOBS=4
jobcount=0

for f in "$@"; do
    [ -f "$f" ] || { echo "Skipping: $f (not a file)"; continue; }
    base="${f%.*}"
    out="${base}.alac.m4a"
    echo "Encoding: $f -> $out"

    ffmpeg -y -hide_banner -loglevel quiet -i "$f" -c:a alac "$out" &
    
    ((jobcount++))
    if (( jobcount % MAX_JOBS == 0 )); then
        wait -n   # wait for at least one job to finish
    fi
done

wait
echo "All encodes finished."