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#!/bin/sh
#
# Copyright (C) 2013 Mark Hills <mark@xwax.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# version 2, as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License version 2 for more details.
#
# You should have received a copy of the GNU General Public License
# version 2 along with this program; if not, write to the Free
# Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
#
# Analyse an audio file and add BPM metadata
#
set -e
usage()
{
cat <<END
bpm-tag (C) Copyright 2013 Mark Hills <mark@xwax.org>
Usage: bpm-tag [options] <file>
Tag an audio file with tempo (in beats-per-minute, BPM)
-f Ignore existing BPM value
-n Display BPM only, don't tag
-m Minimum detected BPM
-x Maximum detected BPM
-h Display this help message and exit
See the bpm-tag(1) man page for more information and examples.
END
}
# Parse command line arguments
FORCE=false
WRITE=true
ARGS=""
while getopts "fhnm:x:" OPT; do
case "$OPT" in
f)
FORCE=true
;;
n)
WRITE=false
;;
m)
ARGS="$ARGS -m $OPTARG"
;;
x)
ARGS="$ARGS -x $OPTARG"
;;
h)
usage
exit 0
;;
?)
exit 1
esac
done
shift $((OPTIND - 1))
if [ -z "$1" ]; then
usage >&2
exit 1
fi
set -u
FILE="$1"
shift
# Don't overwrite an existing BPM tag
case "$FILE" in
*.flac)
BPM=`metaflac --show-tag=BPM "$FILE" | sed -e 's/BPM=//'`
;;
*.mp3)
BPM=`id3v2 -R "$FILE" | sed -n 's/^TBPM.*: \([0-9\.]\+\)/\1/p'`
;;
*.ogg)
BPM=`vorbiscomment "$FILE" | sed -n 's/^BPM=//p'`
;;
*)
echo "$FILE: file extension not known" >&2
exit 1
;;
esac
if [ -n "$BPM" ] && ! $FORCE; then
echo "$FILE: already tagged, $BPM BPM" >&2
exit 1
fi
# Analyse the BPM
BPM=`sox -V1 "$FILE" -r 44100 -e float -c 1 -t raw - | bpm $ARGS`
if [ -z "$BPM" ]; then
exit 1
fi
echo "$FILE: $BPM BPM" >&2
if ! $WRITE; then
exit 0
fi
# Write a BPM tag
case "$FILE" in
*.flac)
metaflac --remove-tag=BPM --set-tag="BPM=$BPM" "$FILE"
;;
*.mp3)
id3v2 --TBPM "$BPM" "$FILE"
;;
*.ogg)
vorbiscomment -at "BPM=$BPM" "$FILE"
;;
*)
echo "$FILE: don't know how to tag this type of file" >&2
exit 1
esac
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