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