full_filename=$(basename "$1")
EXT="${full_filename##*.}"
FILENAME="${full_filename%.*}"
FILENAME="${FILENAME// /\\ }"

#echo $FILENAME
#echo $EXT

TARGET_BPM=184

echo "Calculating BPM..."
BPM=`bpm-tag -m 120 -x 200 -f -n "${1// /\\ }" 2>&1 | grep -oP '\d+\.\d+'`
FACTOR=`bc <<< "scale=5; ${TARGET_BPM}/${BPM}"`

echo "BPM is $BPM"
echo "Applied tempo factor to reach ${TARGET_BPM}BPM: $FACTOR"

NORMALIZED_FILENAME="$FILENAME-normalized.mp3"
NORMALIZED_BPM_FILENAME="$FILENAME-normalized-${TARGET_BPM}BPM.mp3"

echo "Normalizing file..."
sox --norm "${1// /\\ }" -C 0 "${NORMALIZED_FILENAME}"

echo "Applying tempo change..."
sox "${NORMALIZED_FILENAME}" -C 0 "${NORMALIZED_BPM_FILENAME}" tempo -m $FACTOR
rm "${NORMALIZED_FILENAME}"