#!/bin/bash

if [ -z "${1}" ] || [ -z "${2}" ] || [ -z "${3}" ] || [ "${1}" = "${2}"]
then
	echo "Usage: chng-vol.sh Input_File Output_File Volume"
	exit 1
fi

if ! [ -f "${1}" ]
then
	echo "File ${1} not found"
	exit 1
fi

NAME=$( basename "${1}" .sln )
if [ "${NAME}.sln" = "${1}" ]
then
	sox -v "${3}" -t raw -r 8000 -e signed-integer -b 16 -c 1 "${1}" -t raw -r 8000 -e signed-integer -b 16 -c 1 "${2}"
else
	NAME=$( basename "${1}" .wav )
	if [ "${NAME}.wav" = "${1}" ]
	then
		sox -v "${3}" "${1}" "${2}"
	else
		echo "File ${1} is not Sln or Wav"
	fi
fi