#!/bin/sh 

############################################################################

#   

#  Run the LAME encoder on multiple files, with option to delete .wav files

#  after encoding.  "mlame -?" will give instructions.

#

#  Robert Hegemann

#  modified on request: Frank Klemm <pfk@uni-jena.de>

#

############################################################################

# encoder path to use

mp3coder="lame"

mp3analyzer="mlame_corr"

# default options to use

options_low="-h -d -mj -b 128"

options_high="-h -d -mj -V 1 -b 112 -B 320"

options=$options_high

# remove source?

removesource=false

# force overwrite of destination

testoverwrite=true

# waiting after error report n seconds

errordelay=1 

helptext="\n\

This script runs the LAME mp3 encoder on multiple files: \n\n\

    $0 [options] <file 1> ... <file n>\n\

\n\

  options:\n\

    -?                  this help text\n\

    -r                  remove files after encoding\n\

    -f                  force overwrite of destination if exists\n\

    -l                  low quality settings\n\

    -h                  high quality settings\n\

    -o \"<lame options>\" overrides script default options

\n\

  example:\n\

    $0  -r  -f  -o \"-v -V 0 -b 112\" a*.wav z*.aif g*.mp?\n\

\n\

"

#   process command-line options

#   this could be extended to fake the 

#   commandline interface of the mp3encoder

while getopts ":o:r:h:l:f" optn; do

    case $optn in

    o ) options=$OPTARG 	# replace default options

	echo New lame options are \'$options\'

        ;; 

    r ) removesource=true

        echo Removing source files after successfully converting

	;;

    f ) testoverwrite=false

        echo Force overwriting existing destination files

	;;

    h ) options=$options_high

        ;;

    l ) options=$options_low

        ;;

    \? ) printf "$helptext"

	sleep $errordelay

        exit 1  

        ;;

    esac

done

shift $(($OPTIND - 1))

# no files remaining?

if [ "$1" = "" ]; then

    printf "$helptext"

    sleep $errordelay

    exit 1  

fi

#   process input-files

for src in "$@"; do

    case $src in

    *[.][wW][aA][vV]  )

        dst=${src%[.][wW][aA][vV]}.mp3

        if [ -f "$src" ]; then

            if [ $testoverwrite = true -a -f "$dst" ]; then

                echo \'$dst\' already exists, skipping

		sleep $errordelay

            elif $mp3coder $options `$mp3analyzer "$src"` "$src" "$dst"; then

                if [ $removesource = true ]; then

                    rm -f "$src"

                fi

            else

                echo converting of \'$src\' to \'$dst\' failed

		sleep $errordelay

            fi

        else

            echo No source file \'$src\' found.

	    sleep $errordelay

        fi

        ;;

    *[.][aA][iI][fF]  )

        dst=${src%[.][aA][iI][fF]}.mp3

        if [ -f "$src" ]; then

            if [ $testoverwrite = true -a -f "$dst" ]; then

                echo \'$dst\' already exists, skipping

		sleep $errordelay

            elif $mp3coder $options "$src" "$dst"; then

                if [ $removesource = true ]; then

                    rm -f "$src"

                fi

            else

                echo converting of \'$src\' to \'$dst\' failed

		sleep $errordelay

            fi

        else

            echo No source file \'$src\' found.

	    sleep $errordelay

        fi

        ;;

    *[.][aA][iI][fF][fF] )

        dst=${src%[.][aA][iI][fF][fF]}.mp3

        if [ -f "$src" ]; then

            if [ $testoverwrite = true -a -f "$dst" ]; then

                echo \'$dst\' already exists, skipping

		sleep $errordelay

            elif $mp3coder $options "$src" "$dst"; then

                if [ $removesource = true ]; then

                    rm -f "$src"

                fi

            else

                echo converting of \'$src\' to \'$dst\' failed

		sleep $errordelay

            fi

        else

            echo No source file \'$src\' found.

	    sleep $errordelay

        fi

        ;;

    *[.][mM][pP][gG12]  )

        dst=${src%[.][mM][pP][gG12]}.mp3

        if [ -f "$src" ]; then

            if [ $testoverwrite = true -a -f "$dst" ]; then

                echo \'$dst\' already exists, skipping

		sleep $errordelay

            elif $mp3coder $options "$src" "$dst"; then

                if [ $removesource = true ]; then

                    rm -f "$src"

                fi

            else

                echo converting of \'$src\' to \'$dst\' failed

		sleep $errordelay

            fi

        else

            echo No source file \'$src\' found.

	    sleep $errordelay

        fi

        ;;

    *[.][mM][pP]3 )

        dst=${src%[.][mM][pP]3}-new-converted-file.${src##*.}

        if [ -f "$src" ]; then

            if [ $testoverwrite = true -a -f "$dst" ]; then

                echo \'$dst\' already exists, skipping

		sleep $errordelay

            elif $mp3coder $options "$src" "$dst"; then

                if [ $removesource = true ]; then

                    mv -f "$dst" "$src"

                fi

            else

                echo converting of \'$src\' to \'$dst\' failed

		sleep $errordelay

            fi

        else

            echo No source file \'$src\' found.

	    sleep $errordelay

        fi

        ;;

    * ) # the rest

        echo warning: File extention \'.${src##*.}\' not supported

        sleep $errordelay

        ;;

    esac

done