Category: Technology

#!/bin/bash
 
#
# Script to convert .amr to .mp3
#
# by Ady Romantika (ady at romantika dot name) https://blog.adyromantika.com/
# December 2005
#
# Needs:
# 1. amr encoder/decoder http://www.3gpp.org/ftp/Specs/2003-09/Rel-5/26_series/26104-520.zip
#	(to decode amr)
# 2. sox
#	(to convert raw file to wave)
# 3. lame
#	(to convert wave to mp3)
#
# Usage: amr2mp3.sh <inputfile>
#
# Warning: overwrites previous outfile
#
 
# Change this to where you place your decoder
CODECLOCATION=/opt/amrcodec
# Set to 1 to delete intermediate raw and wav files
DELINTERMEDIATEFILES=1
 
INFILE=$1
FILENAME=`echo $INFILE | sed -e "s/.amr//"`
SOX=`which sox`
LAME=`which lame`
 
# Check prerequisites
if [ x${SOX} == 'x' ];
then
	echo I cannot find sox. Are you sure it is installed and in your PATH?
	exit
fi
 
if [ x${LAME} == 'x' ];
then
	echo I cannot find lame. Are you sure it is installed and in your PATH?
	exit
fi
 
# Check for arguments
 
if [ x${INFILE} == 'x' ];
then
	echo I need filename as argument
	exit
fi
 
# Check for input file
 
if [ -e $INFILE ];
then
	echo Found input file $INFILE
else
	echo Input file $INFILE not found, exiting
	exit;
fi
 
# Start conversion
 
echo "Converting AMR to WAV ($1 to ${FILENAME}.mp3)"
 
$CODECLOCATION/decoder $INFILE $FILENAME.raw 
 
$SOX -r 8000 -w -c 1 -s $FILENAME.raw -r 16000 -w -c 1 $FILENAME.wav 
 
$LAME $FILENAME.wav $FILENAME.mp3 --silent --tt $FILENAME --tl AMR --ty `date +%y`
 
# Delete intermediate files if needed
if [ $DELINTERMEDIATEFILES == 1 ];
then
	echo Deleting raw and wave files. Keeping original amr.
	rm $FILENAME.raw $FILENAME.wav
fi
 
if [ -e ${FILENAME}.mp3 ];
then
	echo File succesfully created
else
	echo File creation failed.
fi
 
echo Done!
</inputfile>