81 lines
1.1 KiB
Plaintext
81 lines
1.1 KiB
Plaintext
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#!/bin/sh
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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 -eu
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# Parse command line arguments
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FORCE=false
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WRITE=true
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while getopts "fn" 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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esac
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done
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shift $((OPTIND - 1))
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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`
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if [ -z "$BPM" ]; then
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exit 1
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fi
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if ! $WRITE; then
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echo "$FILE: $BPM BPM" >&2
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exit 0
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fi
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# Write a BPM tag
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case "$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 "$FILE: don't know how to tag this type of file" >&2
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exit 1
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esac
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echo "$FILE: $BPM BPM" >&2
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