alignaudio

#!/bin/bash
set -e

version="0.1"

USAGE="Usage: `basename $0` [-p] [-m] [-a] files"

PRESERVE_PITCH=0;
USE_COMPARATOR="min"

# Parse command line options.
while getopts "hvpam" OPT; do
    case "$OPT" in
        h)
            echo $USAGE
            exit 0
            ;;
        v)
            echo "`basename $0` version $version"
            exit 0
            ;;
        p)
            PRESERVE_PITCH=1
            ;;
        a)
            USE_COMPARATOR="avg"
            ;;
        m)
            USE_COMPARATOR="max"
            ;;
         :)
    echo "option -$OPTARG needs an argument"
    ;;
        \?)
            # getopts issues an error message
            echo $USAGE >&2
            exit 1
            ;;
    esac
done

if [ $PRESERVE_PITCH == 1 ]; then
    echo "We are preserving pitch";
fi

shift $(($OPTIND - 1))

filesToProcess="$@"

#echo "Time to process : $filesToProcess"

fileLengths=($(soxi -s $filesToProcess | sort -n) );

#echo ${fileLengths[@]};

if [ $USE_COMPARATOR == "avg" ]; then
    targetLength=$(echo ${fileLengths[@]} | tr ' ' '\n' | awk '{total+=$1; count+=1;} END {printf("%.0f\n", total/count)}');
elif [ $USE_COMPARATOR == "max" ]; then
    targetLength=${fileLengths[${#fileLengths[@]}-1]};
else
    targetLength=${fileLengths[0]};
fi

echo "Targetting $targetLength samples" ;

for file in ${filesToProcess[@]}; do
    lengthOfFile=`soxi -s $file`;
    if [ $lengthOfFile  == $targetLength ]; then
        echo "Skipping $file";
    else
        speed=$(bc <<< "scale = 10; $lengthOfFile / $targetLength")
                        echo "Processing $file";
                        fileOut="${file%.*}_aligned.${file#*.}";
                        echo "sox $file $fileOut speed $speed";
        sox -V1 $file $fileOut speed $speed
                        outLength=`soxi -s $fileOut`;
                        echo "$fileOut is now $outLength samples";
    fi
done

echo "Done!!"