daemon: Add birdnet_purge.sh recording purge script

daemon/birdnet_clean.sh

@@ -1,6 +1,6 @@
 #! /usr/bin/env bash
 ##
-## Clean up var folder from useless files
+## Clean up var folder from useless files (e.g empty wav, audio with no bird, etc)
 ##
 
 set -e

daemon/birdnet_purge.sh

@@ -0,0 +1,145 @@
+#! /usr/bin/env bash
+# Remove as much as possible as audio files that are not really helpful
+#
+
+set -e
+# set -x
+
+DEBUG=${DEBUG:-0}
+DRY=${DRY:-0}
+debug() {
+    [[ $DEBUG -eq 1 ]] && echo "$@"
+}
+
+remove_selected() {
+    local selected_audios
+    selected_audios="$1"
+    for audio in $selected_audios; do
+        debug "Removing $audio"
+        rm "$CHUNK_FOLDER/out/$audio"
+    done
+}
+
+remove_audios_older_than() {
+    local pivot_date=$1
+    touch -t "$(date -d "$pivot_date" +"%Y%m%d%H%M")" /tmp/birdnet_purge.sh.pivot_date
+    if [[ $DRY -eq 1 ]]; then
+        find "$CHUNK_FOLDER/out/" -type f -name '*.wav' -not -newer /tmp/birdnet_purge.sh.pivot_date
+    else
+        find "$CHUNK_FOLDER/out/" -type f -name '*.wav' -not -newer /tmp/birdnet_purge.sh.pivot_date -delete
+    fi
+}
+
+# Remove audios containing only excluded species
+remove_audios_containing_only_excluded_species() {
+    local excluded_species
+    excluded_species=$1
+    local audios
+    audios=$(find "$CHUNK_FOLDER/out/" -type f -name '*.wav')
+    audios=$(only_audios_containing_excluded_species "$audios" "$excluded_species")
+    if [[ $DRY -eq 1 ]]; then
+        echo "$audios"
+    else
+        remove_selected "$audios"
+    fi
+}
+
+# Filter audio list, keep only those that contains only bird calls of selected exclude list
+only_audios_containing_excluded_species() {
+    local audios
+    audios=$1
+    local excluded_species
+    excluded_species=$2
+    local selected
+    selected=""
+    if [[ -z $excluded_specie ]]; then
+        echo "No species to exclude"
+        return 1
+    fi
+    for file in $audios; do
+        if [[ $(contains_only_excluded_species "$file" "$excluded_species") -eq 1 ]]; then
+            selected="$selected $file"
+        fi
+    done
+}
+
+# Check whether the audio file contains only excluded species
+contains_only_excluded_species() {
+    local audio
+    audio=$1
+    local excluded_species
+    excluded_species=$2
+    local flag
+    flag=1
+    IFS=$','
+    local regex
+    for species in $(get_contacted_species "$audio"); do
+        regex="$species"
+        if [[ $excluded_species =~ $regex ]]; then
+            flag=0
+            break
+        fi
+    done
+    echo flag
+}
+
+# Get all scientific names of species detected by the model
+get_contacted_species() {
+    local audio
+    audio=$1
+    local model_output_path
+    model_output_path="$CHUNK_FOLDER/out/$audio.d/model.out.csv"
+    observations=$(tail -n +2 < "$model_output_path")
+    IFS=$'\n'
+    debug "Observations retrieved from $model_output_path"
+    local species
+    local contacted_species
+    contacted_species=""
+    for observation in $observations; do
+        if [[ -z "$observation" ]]; then
+            continue
+        fi
+        species=$(echo "$observation" | cut -d"," -f3)
+        contacted_species="${contacted_species},${species}"
+    done
+    echo "$contacted_species"
+}
+
+main() {
+    debug "Launching birdnet purge script"
+    local config_path
+    config_path="./config/birdnet.conf"
+    if [[ ! -f $config_path ]]; then
+        echo "Config file $config_path not found"
+        exit 1
+    fi
+    source "$config_path"
+    if [[ -z ${CHUNK_FOLDER} ]]; then
+        echo "CHUNK_FOLDER is not set"
+        exit 1
+    else
+        if [[ ! -d ${CHUNK_FOLDER}/out ]]; then
+            echo "CHUNK_FOLDER does not exist: ${CHUNK_FOLDER}/out"
+            echo "Cannot clean absent folder."
+            exit 1
+        fi
+    fi
+    today=$(date +"%Y-%m-%d")
+    pivot_date=$(date -d "$today - $DAYS_TO_KEEP days" +"%Y-%m-%d")
+    debug "Recordings older than $pivot_date will be removed"
+    remove_audios_older_than "$pivot_date"
+    if [[ -z ${EXCLUDED_SPECIES} ]]; then
+        echo "No species to exclude"
+        exit 1
+    else
+        if [[ -f ${EXCLUDED_SPECIES} ]]; then
+            excluded_species=$(cat "${EXCLUDED_SPECIES}")
+            remove_audios_containing_only_excluded_species "$excluded_species"
+        else
+            echo "Excluded species file ${EXCLUDED_SPECIES} not found"
+            exit 1
+        fi
+    fi
+}
+
+main