From 387d7fa7006ee18b6489b802d83d6dddfa7649c9 Mon Sep 17 00:00:00 2001
From: frederik <frederik.slos@gmail.com>
Date: Wed, 3 Jan 2024 13:50:00 +0100
Subject: [PATCH] use inotifywait

---
 scripts/spectrogram.sh | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/scripts/spectrogram.sh b/scripts/spectrogram.sh
index fe5ec7a..b3aa37a 100755
--- a/scripts/spectrogram.sh
+++ b/scripts/spectrogram.sh
@@ -12,18 +12,13 @@ if [ "$LOGGING_LEVEL" == "info" ] || [ "$LOGGING_LEVEL" == "debug" ];then
   set -x
 fi
 
-# Time to sleep between generating spectrogram's, default set the recording length
-# To try catch the spectrogram as soon as possible run at a smaller intervals
-SLEEP_DELAY=$((RECORDING_LENGTH / 4))
+# Continuously loop generating a spectrogram
+inotifywait -m -e close_write "$HOME/BirdNET-Pi/analyzing_now.txt" |
+while read; do
+  analyzing_now="$(<$HOME/BirdNET-Pi/analyzing_now.txt)"
 
-# Continuously loop generating a spectrogram every 10 seconds
-while true; do
-  analyzing_now="$(cat $HOME/BirdNET-Pi/analyzing_now.txt)"
-
-  if [ ! -z "${analyzing_now}" ] && [ -f "${analyzing_now}" ]; then
+  if [ -n "${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
-
-  sleep $SLEEP_DELAY
 done