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#!/bin/bash
# -----------------------------------------------------------------------------
#
# App Title: convtoflac.sh
# App Version: 1.1
# Author: Jared Breland <jbreland@legroom.net>
# Homepage: http://www.legroom.net/mysoft
#
# Script Function:
# Convert losslessly compressed audio file to FLAC format, preserving tags
# Currently supports FLAC, Monkey's Audio (APE), Shorten, WAV, and WavPack
#
# Instructions:
# Ensure that all programs are properly set in "Setup environment"
#
# Caveats:
# Transcoded files will retain original file name, but use .flac extension
# The one exception is for FLAC input files - the original input file will
# be renamed <name>_old.flac, and the transcoded file will be named
# <name>.flac.
#
# Requirements:
# The following programs must be installed and available
# sed (http://sed.sourceforge.net/)
# used to handle case sensitivity and tag processing
# flac/metaflac (http://flac.sourceforge.net/)
# used to create and tag new FLAC files
# mac (http://sourceforge.net/projects/mac-port/)
# used to decompress APE files
# apeinfo (http://www.legroom.net/mysoft)
# used to read tags from APE files
# shorten (http://etree.org/shnutils/shorten/)
# used to decompress Shorten files
# wvunpack (http://www.wavpack.com/)
# used to decompress WavPack files
#
# Please visit the application's homepage for additional information.
#
# -----------------------------------------------------------------------------
# Setup environment
PROG=`basename $0`
SED=/usr/bin/sed
FLAC=/usr/bin/flac
METAFLAC=/usr/bin/metaflac
MAC=/usr/bin/mac
APEINFO=/usr/local/bin/apeinfo
SHORTEN=/usr/bin/shorten
WVUNPACK=/usr/bin/wvunpack
DELETE=""
COMPRESS="8"
# Function to display usage information
function warning() {
echo -ne "Usage: $PROG [-h] [-cN] [-d|-p] <filename>\n"
echo -ne "Convert losslessly compressed audio file to FLAC format, preserving tags\n"
echo -ne "\nOptions:\n"
echo -ne " -h Display this help information\n"
echo -ne " -cN Set FLAC compression level, where N = 0 (fast) - 8 (best); default is 8\n"
echo -ne " -d Delete file after conversion\n"
echo -ne " -p Prompt to delete file after conversion\n"
echo -ne "\nSupported input formats:\n"
echo -ne " FLAC (.flac)\n"
echo -ne " Monkey's Audio (.ape)\n"
echo -ne " Shorten (.shn)\n"
echo -ne " WAV (.wav)\n"
echo -ne " WavPack (.wv)\n"
exit
}
# Function to parse wvunpack output to find tags and convert to VORBISCOMMENT
function wvtags() {
TAGS2=${TAGS}.wv
$SED -i "/ = /w${TAGS2}" $TAGS
$SED -i "s/ = /=/" $TAGS2
$SED -i 's/\(.*\)=/\U\1=/' $TAGS2
$SED -i "s/TRACK=/TRACKNUMBER=/;s/YEAR=/DATE=/;s/COMMENT=/DESCRIPTION=/" $TAGS2
mv $TAGS2 $TAGS
}
# Process arguments
if [[ $# -eq 0 ]]; then
warning
else
while [ $# -ne 0 ]; do
[ "$1" == "-h" ] && warning
[ "$1" == "-d" ] && DELETE=force
[ "$1" == "-p" ] && DELETE=prompt
[ "${1:0:2}" == "-c" ] && COMPRESS="${1:2}"
FILE=$1
shift
done
fi
# Validate COMPRESS setting
if [[ "$COMPRESS" != [0-8] ]]; then
echo "Error: FLAC compression level must be between 0 and 8"
exit
fi
# Determine file type and base filename
NAME=${FILE%.*}
EXT=`echo "${FILE##*.}" | $SED 's/\(.*\)/\L\1/'`
# Exit if wrong file passed
if [[ "$EXT" != "ape" && "$EXT" != "flac" && "$EXT" != "shn" && "$EXT" != "wav" && "$EXT" != "wv" ]]; then
echo "Error: $FILE is not a supported input format"
exit
fi
# Verify apps exist
if [ ! -e $FLAC ]; then
echo "Error: cannot find flac binary"
MISSING=true
fi
if [ ! -e $METAFLAC ]; then
echo "Error: cannot find metaflac binary"
MISSING=true
fi
if [[ "$EXT" == "ape" && ! -e $APEINFO ]]; then
echo "Error: cannot find apeinfo binary"
MISSING=true
fi
if [[ "$EXT" == "ape" && ! -e $MAC ]]; then
echo "Error: cannot find mac binary"
MISSING=true
fi
if [[ "$EXT" == "shn" && ! -e $SHORTEN ]]; then
echo "Error: cannot find shorten binary"
MISSING=true
fi
if [[ "$EXT" == "wv" && ! -e $WVUNPACK ]]; then
echo "Error: cannot find wvunpack binary"
MISSING=true
fi
[ -n "$MISSING" ] && exit
# Original FLAC file will need to be renamed - abort of file already exists
if [[ "$EXT" == "flac" ]]; then
if [[ -e "${NAME}_old.flac" ]]; then
echo -e "Error: \"${NAME}_old.flac\" already exists: could not rename input file"
exit
else
mv -i "$FILE" "${NAME}_old.flac"
FILE="${NAME}_old.flac"
fi
fi
# Transcode file
if [ "$EXT" == "ape" ]; then
$MAC "$FILE" - -d | $FLAC -$COMPRESS -s -o "$NAME.flac" -
elif [ "$EXT" == "flac" ]; then
$FLAC -d "$FILE" -c | $FLAC -$COMPRESS -s -o "$NAME.flac" -
elif [ "$EXT" == "shn" ]; then
$SHORTEN -x "$FILE" - | $FLAC -$COMPRESS -s -o "$NAME.flac" -
elif [ "$EXT" == "wav" ]; then
$FLAC -$COMPRESS -o "$NAME.flac" "$FILE"
elif [ "$EXT" == "wv" ]; then
$WVUNPACK "$FILE" -o - | $FLAC -$COMPRESS -s -o "$NAME.flac" -
fi
# Abort if transcode failed
if [ $? -ne 0 ]; then
echo -e "\nError: \"$FILE\" could not be converted to a FLAC file"
if [[ "$EXT" == "flac" ]]; then
mv "$FILE" "$NAME.flac"
fi
exit
fi
# Copy tags
if [[ "$EXT" == "ape" || "$EXT" == "flac" || "$EXT" == "wv" ]]; then
echo -ne "\nCopying tags..."
TAGS=/tmp/$PROG.$RANDOM.tags
if [ "$EXT" == "ape" ]; then
$APEINFO -t "$FILE" >$TAGS
elif [ "$EXT" == "flac" ]; then
$METAFLAC --export-tags-to=$TAGS "$FILE"
elif [ "$EXT" == "wv" ]; then
$WVUNPACK -qss "$FILE" >$TAGS
wvtags
fi
if [[ $? -ne 0 || ! -s "$TAGS" ]]; then
echo -ne "\nWarning: tags could not be read from \"$FILE\"\n"
else
$METAFLAC --import-tags-from=$TAGS "$NAME.flac"
if [[ $? -ne 0 ]]; then
echo -ne "\nWarning: tags could not be written to \"$NAME.flac\"\n"
else
echo -ne " complete\n"
fi
fi
rm $TAGS
fi
# Delete old file
if [ "$DELETE" == "prompt" ]; then
echo -ne "\nDelete \"$FILE\"? "
read -e DELPROMPT
if [[ "$DELPROMPT" == "y" || "$DELPROMPT" == "Y" ]]; then
DELETE=force
fi
fi
echo -ne "\nConversion complete - "
if [ "$DELETE" == "force" ]; then
rm "$FILE"
echo -ne "deleted"
else
echo -ne "kept"
fi
echo -ne " \"$FILE\"\n"
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