80 lines
2.5 KiB
Bash
80 lines
2.5 KiB
Bash
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#!/bin/bash -
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#
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# Copied from a 'history' file on archive.org and turned into a script
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#
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set -o nounset # Treat unset variables as an error
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SCRIPT=${0##*/}
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#=== FUNCTION ================================================================
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# NAME: cleanup_temp
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# DESCRIPTION: Cleanup temporary files in case of a keyboard interrupt
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# (SIGINT) or a termination signal (SIGTERM) and at script
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# exit
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# PARAMETERS: * - names of temporary files to delete
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# RETURNS: Nothing
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#===============================================================================
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function cleanup_temp {
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for tmp in "$@"; do
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[ -e "$tmp" ] && rm --force "$tmp"
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done
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exit 0
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}
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#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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if [[ $# -eq 0 ]]; then
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echo "Usage: $SCRIPT audio_file"
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exit 1
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fi
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AUDIO="$1"
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IMAGE="${AUDIO%.*}.png"
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if [[ ! -e $AUDIO ]]; then
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echo "$SCRIPT: audio file $AUDIO not found"
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exit 1
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fi
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#
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# Make a temporary file (called /tmp/XXXX.png) and set traps to delete them
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#
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TMP1=$(mktemp -p /tmp XXXXXXXX.png) || {
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echo "$SCRIPT: creation of temporary file failed!"
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exit 1
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}
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trap 'cleanup_temp $TMP1' SIGHUP SIGINT SIGPIPE SIGTERM EXIT
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#
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# Make a temporary PNG file from the audio. The original uses a 'timeout' call
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# but I can't get it to work for me.
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#
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ffmpeg -v 0 -analyzeduration 900000000000 -probesize 200M -threads 2 -i "$AUDIO" \
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-filter_complex aformat=channel_layouts=mono,showwavespic=colors=white:s=3200x800 \
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-frames:v 1 -f apng - 2>/dev/null | \
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magick - -background black -alpha remove -alpha off "$TMP1" 2>/dev/null | cat > /dev/null 2>&1
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#
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# Not clear what's being done to the image here, but it produces a useful end
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# result, or seems to!
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#
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magick -background black "$TMP1" -gravity center -background black -transparent white - | \
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magick - -gravity South -background white -splice 0x5 -background black -splice 0x5 - | \
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magick - -trim - | \
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magick - -gravity South -chop 0x5 - | \
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magick - -gravity North -background white -splice 0x5 -background black -splice 0x5 - | \
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magick - -trim - | \
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magick - -gravity North -chop 0x5 - | \
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magick - -resize '800x200!' "$IMAGE"
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#
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# The original renamed the temporary file to be the target image file, but
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# that's probably becausae part of this is done in a Docker container. Doesn't
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# seem appropriate here
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#
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# vim: syntax=sh:ts=8:sw=4:ai:et:tw=78:fo=tcrqn21
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