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#!/bin/bash

help() {
    echo "Usage:"
    echo "audio_normalization.sh [-i input directory] [-o output directory] [-s sample rate] [-j number of jobs (default=1)]"
    exit -1
}
 
thread_num=1
 
while getopts 'i:o:s:j:h' OPT; do
    case $OPT in
        i) dir_in="$OPTARG";;
        o) dir_out="$OPTARG";;
        s) sample_rate="$OPTARG";;
        j) thread_num="$OPTARG";;
        r) recursive="$OPTARG";;
        h) help;;
        ?) help;;
    esac
done

# dir_in=$1
# dir_out=$2
# sample_rate=$3
# thread_num=1

if [ ! -n "$sample_rate" ]; then
    echo "Sample rate is unknown!"
    exit 1
fi

mkdir -p $dir_out

if [ $thread_num == 1 ]; then
    # Single threads
    for filename in `ls $dir_in`; do
        if [ ${filename##*.} != 'wav' ]; then
            continue
        fi
        echo $filename
        sox $dir_in/$filename -c 1 -r $sample_rate -b 16 --norm=-7 $dir_out/$filename
    done
else
    tmp_fifofile="/tmp/$$.fifo"
    mkfifo $tmp_fifofile
    exec 6<>$tmp_fifofile
    rm $tmp_fifofile

    # Initialization
    for ((i=0;i<${thread_num};i++));do
        echo
    done >&6

    # Multiple threads
    for filename in `ls $dir_in`; do
        read -u6
        {
            if [ ${filename##*.} != 'wav' ]; then
                continue
            fi
            echo $filename
            sox $dir_in/$filename -c 1 -r $sample_rate -b 16 --norm=-7 $dir_out/$filename
            
            echo >&6
        } &
    done

    wait
    exec 6>&-
    echo "Done!"
fi