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#!/bin/sh
# Asterisk voicemail attachment conversion script
# Revision history :
# 22/11/2010 - V1.0 - Creation by N. Bernaerts
# 07/02/2012 - V1.1 - Add handling of mails without attachment (thanks to Paul Thompson)
# 01/05/2012 - V1.2 - Use mktemp, pushd & popd
# 08/05/2012 - V1.3 - Change mp3 compression to CBR to solve some smartphone compatibility (thanks to Luca Mancino)
# 01/08/2012 - V1.4 - Add PATH definition to avoid any problem (thanks to Christopher Wolff)
# 16/07/2015 - V1.5 - Handle natively GSM WAV (thanks to Michael Munger)
# set PATH
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
# save the current directory
pushd .
# create a temporary directory and cd to it
TMPDIR=$(mktemp -d)
cd $TMPDIR
# dump the stream to a temporary file
cat >> stream.org
# get the boundary
BOUNDARY=$(grep "boundary=" stream.org | cut -d'"' -f 2)
# cut the file into parts
# stream.part - header before the boundary
# stream.part1 - header after the bounday
# stream.part2 - body of the message
# stream.part3 - attachment in base64 (WAV file)
# stream.part4 - footer of the message
awk '/'$BOUNDARY'/{i++}{print > "stream.part"i}' stream.org
# if mail is having no audio attachment (plain text)
PLAINTEXT=$(cat stream.part1 | grep 'plain')
if [ "$PLAINTEXT" != "" ]
then
# prepare to send the original stream
cat stream.org > stream.new
# else, if mail is having audio attachment
else
# cut the attachment into parts
# stream.part3.head - header of attachment
# stream.part3.wav.base64 - wav file of attachment (encoded base64)
sed '7,$d' stream.part3 > stream.part3.wav.head
sed '1,6d' stream.part3 > stream.part3.wav.base64
# convert the base64 file to a wav file
dos2unix -o stream.part3.wav.base64
base64 -di stream.part3.wav.base64 > stream.part3.wav
# convert wave file (GSM encoded or not) to PCM wav file
sox stream.part3.wav stream.part3-pcm.wav
# convert PCM wav file to mp3 file
# -b 24 is using CBR, giving better compatibility on smartphones (you can use -b 32 to increase quality)
# -V 2 is using VBR, a good compromise between quality and size for voice audio files
lame -m m -b 24 stream.part3-pcm.wav stream.part3.mp3
# convert back mp3 to base64 file
base64 stream.part3.mp3 > stream.part3.mp3.base64
# generate the new mp3 attachment header
# change Type: audio/x-wav or audio/x-WAV to Type: audio/mpeg
# change name="msg----.wav" or name="msg----.WAV" to name="msg----.mp3"
sed 's/x-[wW][aA][vV]/mpeg/g' stream.part3.wav.head | sed 's/.[wW][aA][vV]/.mp3/g' > stream.part3.mp3.head
# generate first part of mail body, converting it to LF only
mv stream.part stream.new
cat stream.part1 >> stream.new
cat stream.part2 >> stream.new
cat stream.part3.mp3.head >> stream.new
dos2unix -o stream.new
# append base64 mp3 to mail body, keeping CRLF
unix2dos -o stream.part3.mp3.base64
cat stream.part3.mp3.base64 >> stream.new
# append end of mail body, converting it to LF only
echo "" >> stream.tmp
echo "" >> stream.tmp
cat stream.part4 >> stream.tmp
dos2unix -o stream.tmp
cat stream.tmp >> stream.new
fi
# send the mail thru sendmail
cat stream.new | sendmail -t
# go back to original directory
popd
# remove all temporary files and temporary directory
rm -Rf $TMPDIR