Recode MP3 files with normalization

recode.sh

#!/bin/bash                                                                                                                                                                                          
#                                                                                                                                                                                                    
#  recode                                                                                                                                                                                            
#                                                                                                                                                                                                    
#  Copyright 2011 Costin STROIE <[email protected]>                                                                                                                                          
#                                                                                                                                                                                                    
#  recode is free software: you can redistribute it and/or modify                                                                                                                                    
#  it under the terms of the GNU General Public License as published by                                                                                                                              
#  the Free Software Foundation, either version 3 of the License, or                                                                                                                                 
#  (at your option) any later version.                                                                                                                                                               
#                                                                                                                                                                                                    
#  recode is distributed in the hope that it will be useful,                                                                                                                                         
#  but WITHOUT ANY WARRANTY; without even the implied warranty of                                                                                                                                    
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                                                                                                                                     
#  GNU General Public License for more details.                                                                                                                                                      
#                                                                                                                                                                                                    
#  You should have received a copy of the GNU General Public License                                                                                                                                 
#  along with recode.  If not, see <http://www.gnu.org/licenses/>.                                                                                                                                   
#                                                                                                                                                                                                    
                                                                                                                                                                                                     
# Recode audio files                                                                                                                                                                                 
                                                                                                                                                                                                     
WAVDIR="wav"                                                                                                                                                                                         
MP3DIR="mp3"                                                                                                                                                                                         
M4ADIR="m4a"                                                                                                                                                                                         
                                                                                                                                                                                                     
# Create dirs                                                                                                                                                                                        
[ -d "${WAVDIR}" ] || mkdir "${WAVDIR}"                                                                                                                                                              
[ -d "${MP3DIR}" ] || mkdir "${MP3DIR}"                                                                                                                                                              
[ -d "${M4ADIR}" ] || mkdir "${M4ADIR}"                                                                                                                                                              
                                                                                                                                                                                                     
for F in *.mp3                                                                                                                                                                                       
do                                                                                                                                                                                                   
  BN=`basename "$F" ".mp3"`                                                                                                                                                                          
  WAV="${WAVDIR}/${BN}.wav"                                                                                                                                                                          
  MP3="${MP3DIR}/${BN}.mp3"                                                                                                                                                                          
  M4A="${M4ADIR}/${BN}.m4a"                                                                                                                                                                          
  # Decode                                                                                                                                                                                           
  madplay -o "${WAV}" "${F}"                                                                                                                                                                         
  # Normalize                                                                                                                                                                                        
  normalize-audio -v "${WAV}"                                                                                                                                                                        
  # Encode to MP3                                                                                                                                                                                    
  lame --preset standard "${WAV}" "${MP3}"                                                                                                                                                           
  # Copy the ID3 tags                                                                                                                                                                                
  id3cp "${F}" "${MP3}"                                                                                                                                                                              
  # Encode to M4A                                                                                                                                                                                    
  faac -w -s -o "${M4A}" "${WAV}"                                                                                                                                                                    
  # Remove the WAV file                                                                                                                                                                              
  rm -f "${WAV}"                                                                                                                                                                                     
done                                                                                                                                                                                                 
                                                                                                                                                                                              
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