#!/bin/sh
# convert recordings to as mp3 audio only
# version 1.1.2

# usage:
# first parameter must be %DIR%/%FILE% of the recording
# second parameter must be the desired base name of the output
# third parameter must be %CHANID% if you set USECUTLIST=Y
# fourth parameter must be %STARTTIME% if you set USECUTLIST=Y
# In the mythtv setup screen invoke this script like this:
# MYTHTV User Job Command:
# /usr/LH/bin/myth2mp3 "%DIR%/%FILE%" "%TITLE% - %SUBTITLE%" "%CHANID%" "%STARTTIME%"

# options:
BITRATE=256k		#ie. 128k, 160k, 192k, 224k, 256k
USECUTLIST=Y		#Y or N

# where the converted audio is stored
OUT_DIR=/myth/music

# create temp filename so multiple instances won't conflict
TMPNAME=toMP3-$$
TMPFILE=/myth/tmp/$TMPNAME
TMPCUTFILE=/myth/tmp/$TMPNAME.mpg
FFINPUTFILE=$1
TITLE=`echo $2 | sed 's/\//_/g'`

# log file location
LOGFILE=/var/log/mythtv/myth2mp3.log
CDate="`date`"
echo "" >> $LOGFILE
echo $CDate >> $LOGFILE
echo "File to encode: $1     Name: $TITLE" >> $LOGFILE

# start timer
beforetime="$(date +%s)"

# check if using cutlist
if [ $USECUTLIST = Y ];then
    MYTHCOMMFRAMES=`mythcommflag --getcutlist -f "$FFINPUTFILE" | grep 'Cutlist:' | cut -d \  -f 2`
    if [ -n "$MYTHCOMMFRAMES" ]; then
        echo "Extracting Cutlist..." >> $LOGFILE
        /usr/bin/nice -n19 /usr/bin/mythtranscode --chanid "$3" --starttime "$4" --outfile "$TMPCUTFILE" --mpeg2 --honorcutlist
        FFINPUTFILE=$TMPCUTFILE
    fi
fi

# run ffmpeg to do conversion to wav
echo "Encoding to intermediate wav..." >> $LOGFILE
/usr/bin/nice -n19 /usr/bin/ffmpeg -i "$FFINPUTFILE" -vn -acodec pcm_s16le -ar 44100 -ac 2 "$TMPFILE.wav"
ERROR=$?

# Normalize the intermediate wav
echo "Normalizing intermediate wav..." >> $LOGFILE
/usr/bin/nice -n19 /usr/bin/normalize -q "$TMPFILE.wav"
ERROR=$?

FFINPUTFILE=$TMPFILE.wav

# Final encode of normalized wav to mp3
echo "Encoding normalized wav to mp3..." >> $LOGFILE
/usr/bin/nice -n19 /usr/bin/ffmpeg -i "$FFINPUTFILE" -vn -acodec libmp3lame -ab $BITRATE -ar 44100 -ac 2 "$TMPFILE.mp3"
ERROR=$?

# make output filename unique
OUTPUTFILE=$OUT_DIR/$TITLE.mp3
i=1
while [ -e "$OUTPUTFILE" ]
do
    OUTPUTFILE=$OUT_DIR/$TITLE-$i.mp3
    i=`expr $i + 1`
done

# move temp file to output location
chown mythtv "$TMPFILE.mp3" && mv "$TMPFILE.mp3" "$OUTPUTFILE"

# stop timer
aftertime="$(date +%s)"
seconds="$(expr $aftertime - $beforetime)"

if [ $ERROR -eq 0 ]; then
    echo "File Encoded Sucessfully: $OUTPUTFILE" >> $LOGFILE
    hours=$((seconds / 3600))
    seconds=$((seconds % 3600))
    minutes=$((seconds / 60))
    seconds=$((seconds % 60))
    echo "Encoding Time: $hours hour(s) $minutes minute(s) $seconds second(s)" >> $LOGFILE
else
    echo "ERROR: $ERROR" >> $LOGFILE
fi

# clean up left over files
unlink $TMPFILE.mp3 2> /dev/null
unlink $TMPFILE.wav 2> /dev/null
unlink $TMPCUTFILE 2> /dev/null
unlink $TMPCUTFILE.map 2> /dev/null