1 #!/bin/sh
   2 # Asterisk voicemail attachment conversion script
   3 # Revision history :
   4 # 22/11/2010 - V1.0 - Creation by N. Bernaerts
   5 # 07/02/2012 - V1.1 - Add handling of mails without attachment (thanks to Paul Thompson)
   6 # 01/05/2012 - V1.2 - Use mktemp, pushd & popd
   7 # 08/05/2012 - V1.3 - Change mp3 compression to CBR to solve some smartphone compatibility (thanks to Luca Mancino)
   8 # 01/08/2012 - V1.4 - Add PATH definition to avoid any problem (thanks to Christopher Wolff)
   9 # 16/07/2015 - V1.5 - Handle natively GSM WAV (thanks to Michael Munger)
  10 
  11 # set PATH
  12 PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
  13 
  14 # save the current directory
  15 pushd .
  16  
  17 # create a temporary directory and cd to it
  18 TMPDIR=`mktemp -d`
  19 cd $TMPDIR
  20  
  21 # dump the stream to a temporary file
  22 cat >> stream.org
  23  
  24 # get the boundary
  25 BOUNDARY=`awk -F'"' '/boundary=/ {print $2}' stream.org`
  26  
  27 # cut the file into parts
  28 # stream.part - header before the boundary
  29 # stream.part1 - header after the bounday
  30 # stream.part2 - body of the message
  31 # stream.part3 - attachment in base64 (WAV file)
  32 # stream.part4 - footer of the message
  33 awk "/$BOUNDARY/{i++}{print > \"stream.part\"i}" stream.org
  34  
  35 # if mail is having no audio attachment (plain text)
  36 if grep -q 'plain' stream.part1
  37 then
  38  
  39   # prepare to send the original stream
  40   cat stream.org > stream.new
  41  
  42 # else, if mail is having audio attachment
  43 else
  44   # cut the attachment into parts
  45   # stream.part3.head - header of attachment
  46   # stream.part3.wav.base64 - wav file of attachment (encoded base64)
  47   sed '7,$d' stream.part3 > stream.part3.wav.head
  48   sed '1,6d' stream.part3 > stream.part3.wav.base64
  49  
  50   # convert the base64 file to a wav file
  51   dos2unix -o stream.part3.wav.base64
  52   base64 -di stream.part3.wav.base64 > stream.part3.wav
  53 
  54   # convert wave file (GSM encoded or not) to PCM wav file
  55   sox stream.part3.wav stream.part3-pcm.wav
  56  
  57   # convert PCM wav file to mp3 file
  58   # -b 24 is using CBR, giving better compatibility on smartphones (you can use -b 32 to increase quality)
  59   # -V 2 is using VBR, a good compromise between quality and size for voice audio files
  60   lame -m m -b 32 stream.part3-pcm.wav stream.part3.mp3
  61  
  62   # convert back mp3 to base64 file
  63   base64 stream.part3.mp3 > stream.part3.mp3.base64
  64  
  65   # generate the new mp3 attachment header
  66   # change Type: audio/x-wav or audio/x-WAV to Type: audio/mpeg
  67   # change name="msg----.wav" or name="msg----.WAV" to name="msg----.mp3"
  68   sed 's/x-[wW][aA][vV]/mpeg/g' stream.part3.wav.head | sed 's/.[wW][aA][vV]/.mp3/g' > stream.part3.mp3.head
  69  
  70   # generate first part of mail body, converting it to LF only
  71   mv stream.part stream.new
  72   cat stream.part1 >> stream.new
  73   cat stream.part2 >> stream.new
  74   cat stream.part3.mp3.head >> stream.new
  75   dos2unix -o stream.new
  76  
  77   # append base64 mp3 to mail body, keeping CRLF
  78   unix2dos -o stream.part3.mp3.base64
  79   cat stream.part3.mp3.base64 >> stream.new
  80  
  81   # append end of mail body, converting it to LF only
  82   echo "" >> stream.tmp
  83   echo "" >> stream.tmp
  84   cat stream.part4 >> stream.tmp
  85   dos2unix -o stream.tmp
  86   cat stream.tmp >> stream.new
  87  
  88 fi
  89  
  90 # send the mail thru sendmail
  91 cat stream.new | sendmail -t
  92  
  93 # go back to original directory
  94 popd
  95  
  96 # remove all temporary files and temporary directory
  97 #rm -Rf $TMPDIR
  98