From 167747019aca7a08f3f04b8d77dd4711de96c283 Mon Sep 17 00:00:00 2001
From: Alexandre <44178713+alexbelgium@users.noreply.github.com>
Date: Mon, 27 May 2024 10:37:20 +0200
Subject: [PATCH] Create spectral_analysis.sh

---
 .../rootfs/helpers/spectral_analysis.sh       | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 birdnet-pi/rootfs/helpers/spectral_analysis.sh

diff --git a/birdnet-pi/rootfs/helpers/spectral_analysis.sh b/birdnet-pi/rootfs/helpers/spectral_analysis.sh
new file mode 100644
index 000000000..74217ef38
--- /dev/null
+++ b/birdnet-pi/rootfs/helpers/spectral_analysis.sh
@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+# Performs the recording from the specified RTSP stream or soundcard
+source /etc/birdnet/birdnet.conf
+
+# Read the logging level from the configuration option
+LOGGING_LEVEL="${LogLevel_BirdnetRecordingService}"
+# 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
+
+[ -z $RECORDING_LENGTH ] && RECORDING_LENGTH=15
+[ -d $RECS_DIR/StreamData ] || mkdir -p $RECS_DIR/StreamData
+
+if [ ! -z $RTSP_STREAM ];then
+  # Explode the RSPT steam setting into an array so we can count the number we have
+  RTSP_STREAMS_EXPLODED_ARRAY=(${RTSP_STREAM//,/ })
+
+  while true;do
+
+    # Initially start the count off at 1 - our very first stream
+    RTSP_STREAMS_STARTED_COUNT=1
+    FFMPEG_PARAMS=""
+
+    # Loop over the streams
+    for i in "${RTSP_STREAMS_EXPLODED_ARRAY[@]}"
+    do
+      # Map id used to map input to output (first stream being 0), this is 0 based in ffmpeg so decrement our counter (which is more human readable) by 1
+      MAP_ID=$((RTSP_STREAMS_STARTED_COUNT-1))
+      # Build up the parameters to process the RSTP stream, including mapping for the output
+      FFMPEG_PARAMS+="-vn -thread_queue_size 512 -i ${i} -map ${MAP_ID}:a:0 -t ${RECORDING_LENGTH} -acodec pcm_s16le -ac 2 -ar 48000 file:${RECS_DIR}/StreamData/spectrum.wav "
+      # Increment counter
+      ((RTSP_STREAMS_STARTED_COUNT += 1))
+    done
+
+  # Make sure were passing something valid to ffmpeg, ffmpeg will run interactive and control our loop by waiting ${RECORDING_LENGTH} between loops because it will stop once that much has been recorded
+  if [ -n "$FFMPEG_PARAMS" ];then
+    ffmpeg -hide_banner -loglevel $LOGGING_LEVEL -nostdin $FFMPEG_PARAMS
+  fi
+
+  done
+else
+  if pgrep arecord &> /dev/null ;then
+    echo "Recording"
+  else
+    if [ -z ${REC_CARD} ];then
+      arecord -f S16_LE -c${CHANNELS} -r48000 -t wav --max-file-time ${RECORDING_LENGTH}\
+	      	      	       --use-strftime ${RECS_DIR}/StreamData/spectrum.wav
+    else
+      arecord -f S16_LE -c${CHANNELS} -r48000 -t wav --max-file-time ${RECORDING_LENGTH}\
+        -D "${REC_CARD}" --use-strftime ${RECS_DIR}/StreamData/spectrum.wav
+    fi
+  fi
+fi
+
+# Create the spectral analysis
+"$PYTHON_VIRTUAL_ENV" "$HOME"/BirdNET-Pi/scripts/spectral_analysis.py