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#!/bin/sh
# Creates a spectrogram image from an audio file using FFmpeg
# and opens it with the preferred image viewer.

me=$(basename "$0")

if [ -z "$1" ]; then
  exit 1
fi

TEMP=$(mktemp -u -t "${me}" 2>/dev/null || mktemp -u -t "${me}"-XXXXXXXXXX)
TEMPIMG="${TEMP}.png"
TEMPTXT="${TEMP}.txt"

basename "$1" >"${TEMPTXT}"

ffmpeg -v quiet -y -i "$1" -filter_complex showspectrumpic=s=2560x1024,drawtext="expansion=none:textfile='${TEMPTXT}':x=(w-tw)/2:y=16:fontcolor='white':fontsize=20" "$TEMPIMG"
exitcode=$?
if [ $exitcode -ne 0 ]; then
  rm "$TEMPTXT"
  exit $exitcode
fi

dummy=$(xdg-open "$TEMPIMG")
rm "$TEMPIMG" "$TEMPTXT"