#!/bin/sh
#
#	$Id: flactoogg,v 1.4 2005/02/17 13:07:00 lukem Exp $
#
# Copyright 2003-2004 Luke Mewburn <luke@mewburn.net>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
# TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#
# flagtoogg, flactomp3, oggtomp3 --
#	Convert between the appropriate formats, attempting to retain as
#	much of the appropriate metadata tags as possible.
#
#	http://www.mewburn.net/luke/src/flactoogg
#

# REQUIRES:
#	tool	from
#	----	----
#	flac	http://flac.sourceforge.net/
#	gogo	http://homepage1.nifty.com/herumi/gogo_e.html
#	id3ed	http://www.azstarnet.com/~donut/programs/id3ed.html
#	ogg123	http://www.vorbis.com/	(vorbis-tools)


# wav_to_ogg oggfile
#	encode from .wav on stdin to ogg, writing to oggfile
#
wav_to_ogg()
{
	oggenc -Q -q 1 -o "$1" -
}

# wav_to_mp3 mp3file
#	encode from .wav on stdin to mp3, writing to mp3file
#
wav_to_mp3()
{
	gogo -b 64 stdin "$1"
}

# tag_mp3_from_oggtags mp3file tagfile 
#	parse tagfile into ID3 tags and apply to mp3file.
tag_mp3_from_vorbis()
{
	mp3file="$1"
	tagfile="$2"

	album=
	artist=
	title=
	track=
	while read -r tag; do
		tagvar="${tag%%=*}"
		tagval="${tag#*=}"
		case "${tagvar}" in
		ALBUM)		album="${tagval}" ;;
		ARTIST)		artist="${tagval}" ;;
		TITLE)		title="${tagval}" ;;
		TRACKNUMBER)	track="${tagval}" ;;
		esac
	done < "${tagfile}"
	id3ed -q -a "${album}" -n "${artist}" -s "${title}" -k "${track}" \
	    "${mp3file}"
}


flac_to_ogg()
{
	file="$1"
	filebn="${file%.flac}"
	fileogg="${filebn}.ogg"
	if [ "${filebn}" = "${file}" ]; then
		echo "Skipping ${file}"
		return
	fi
	if [ "${fileogg}" -nt "${file}" ]; then
		echo "Skipping ${file}"
		return
	fi

	echo "Converting ${file}"

	tmptag="${filebn}.tmp.tag"
	tmpogg="${filebn}.tmp.ogg"
	trap "/bin/rm -f \"${tmptag}\" \"${tmpogg}\"; exit 0"  0 2 3 13

	metaflac --export-tags-to="${tmptag}" "${file}"
	flac -sdc "${file}" | wav_to_ogg "${tmpogg}"
	if [ -s "${tmptag}" ]; then
		vorbiscomment -w -c "${tmptag}" "${tmpogg}" "${fileogg}"
	else
		mv "${tmpogg}" "${fileogg}"
	fi

	rm -f "${tmpogg}" "${tmptag}"
	trap "-"  0 2 3 13
}


flac_to_mp3()
{
	file="$1"
	filebn="${file%.flac}"
	filemp3="${filebn}.mp3"
	if [ "${filebn}" = "${file}" ]; then
		echo "Skipping ${file}"
		return
	fi
	if [ "${filemp3}" -nt "${file}" ]; then
		echo "Skipping ${file}"
		return
	fi

	echo "Converting ${file}"

	tmptag="${filebn}.tmp.tag"
	tmpmp3="${filebn}.tmp.mp3"
	trap "/bin/rm -f \"${tmptag}\" \"${tmpmp3}\"; exit 0"  0 2 3 13

	metaflac --export-tags-to="${tmptag}" "${file}"
	flac -sdc "${file}" | wav_to_mp3 "${tmpmp3}"
	tag_mp3_from_vorbis "${tmpmp3}" "${tmptag}"
	mv "${tmpmp3}" "${filemp3}"

	rm -f "${tmpmp3}" "${tmptag}"
	trap "-"  0 2 3 13
}

ogg_to_mp3()
{
	file="$1"
	filebn="${file%.ogg}"
	filemp3="${filebn}.mp3"
	if [ "${filebn}" = "${file}" ]; then
		echo "Skipping ${file}"
		return
	fi
	if [ "${filemp3}" -nt "${file}" ]; then
		echo "Skipping ${file}"
		return
	fi

	echo "Converting ${file}"

	tmptag="${filebn}.tmp.tag"
	tmpmp3="${filebn}.tmp.mp3"
	trap "/bin/rm -f \"${tmptag}\" \"${tmpmp3}\"; exit 0"  0 2 3 13

	vorbiscomment -l "${file}" > "${tmptag}"
	oggdec -q -o - "${file}" | wav_to_mp3 "${tmpmp3}"
	tag_mp3_from_vorbis "${tmpmp3}" "${tmptag}"
	mv "${tmpmp3}" "${filemp3}"

	rm -f "${tmpmp3}" "${tmptag}"
	trap "-"  0 2 3 13
}


for f in "$@"; do
	case "$0" in
	*flactoogg)
		flac_to_ogg "${f}"
		;;
	*flactomp3)
		flac_to_mp3 "${f}"
		;;
	*oggtomp3)
		ogg_to_mp3 "${f}"
		;;
	esac
done