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AvianVisitors/scripts/spectrogram.sh
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#!/usr/bin/env bash
# Make sox spectrogram
source /etc/birdnet/birdnet.conf
# Read the logging level from the configuration option
LOGGING_LEVEL="${LogLevel_SpectrogramViewerService}"
# If empty for some reason default to log level of error
[ -z $LOGGING_LEVEL ] && LOGGING_LEVEL='error'
# Additionally if we're at debug or info level then allow printing of script commands and variables
if [ "$LOGGING_LEVEL" == "info" ] || [ "$LOGGING_LEVEL" == "debug" ];then
# Enable printing of commands/variables etc to terminal for debugging
set -x
fi
next=0
looptime=$(( RECORDING_LENGTH * 2 / 3 ))
touch "$HOME/BirdSongs/StreamData/analyzing_now.txt"
# Continuously loop generating a spectrogram
inotifywait -m -e close_write "$HOME/BirdSongs/StreamData/analyzing_now.txt" |
while read; do
now=$(date +%s)
if (( now > next )); then
analyzing_now="$(<$HOME/BirdSongs/StreamData/analyzing_now.txt)"
if [ -n "${analyzing_now}" ] && [ -f "${analyzing_now}" ]; then
spectrogram_png=${EXTRACTED}/spectrogram.png
sox -V1 "${analyzing_now}" -n remix 1 rate 24k spectrogram -c "${analyzing_now//$HOME\//}" -o "${spectrogram_png}"
fi
next=$(( now + looptime ))
fi
done