#!/bin/bash

# Ogg/Mp3 to M4a Conversion
# Written by Tristanto Prabowo
# Version 0.1: Jan 14, 2007

# Derived from "audio convert" by edoardo <thetroublemaker __at__ inventati __dot__ org>
# http://gnomefiles.org/app.php/audio_convert

# Requirement: zenity (dialogs), vorbis-tools (decoding ogg files), 
#              lame (decoding mp3 files), faac (encoding m4a) 
# Tested on Ubuntu 6.10 - The Edgy Eft


title="Ogg/Mp3 to M4a Conversion Ver 0.1"
quality="125"  # change to adjust the quality of m4a files generated
               # type "faac --help" for details

#--------------- Functions:

is_ogg(){
	file -b "$1" | grep 'Vorbis' || echo $1 | grep -i '\.ogg$'
}

is_mp3 (){
	file -b "$1" | grep 'MP3' || echo $1 | grep -i '\.mp3$'
}

ogg_decode (){
	oggdec "$1" -o "$temp_file" 2>&1 | awk -vRS='\r' '(NR>1){gsub(/%/," ");print $2; fflush();}' | zenity --progress --title="$title" --text="Decoding: $1" --auto-close
}

mp3_decode (){
	lame --decode "$1" "$temp_file" 2>&1 | awk -vRS='\r' -F'[ /]+' '(NR>2){if((100*$2/$3)<=100)print 100*$2/$3; fflush();}' | zenity --progress --title="$title" --text="Decoding: $1" --auto-close
}

m4a_encode (){
  faac -w -q $quality "$1" 2>&1 | awk -vRS='\r' '(NR>1){gsub(/%/," ");print $3; fflush();}' | zenity --progress --title="$title" --text="Encoding to: $out_file" --auto-close
}



#-------------- Main:

file_number=$#
(while [ $# -gt 0 ]; do

  in_file=$1
  out_file=`echo "$in_file" | sed 's/\.\w*$/'.m4a'/'`
	temp_file=`echo "$in_file" | sed 's/\.\w*$/'.wav'/'`


  if (is_ogg "$in_file") then
    ogg_decode "$in_file"
    m4a_encode "$temp_file"
    rm -f "$temp_file"
  fi
	
  if (is_mp3 "$in_file") then	
    mp3_decode "$in_file"
    m4a_encode "$temp_file"
    rm -f "$temp_file"
  fi

  shift
done
)