NBMrec/src/nbmrec.sh

#!/bin/bash

# NBMrec 
# nocturnal bird migration recorder daemon
# by Samuel ORTION

RECORD_DIR="/mnt/DATA/media/records"
RECORD_DATE=$(date +"%Y-%m-%d")
PREFIX="nbmrec"
RECORD_FILENAME="${PREFIX}_$(date +"%Y%m%d_%H%M%S").wav"
RECORD_FILEPATH="${RECORD_DIR}/${RECORD_DATE}/${RECORD_FILENAME}" 
START_TIME="22:00"
END_TIME="06:00"
START_TIMESTAMP=$(date -d "$START_TIME" "+%s")
END_TIMESTAMP=$(date -d "$END_TIME + 1 day" "+%s")
RECORD_DURATION=$(( $START_TIMESTAMP - $END_TIMESTAMP ))
VERBOSE=false

# Load conf file if any 
if [ -f /usr/local/etc/nbmrec/nbmrec.conf ]; then
  source /usr/local/etc/nbmrec/nbmrec.conf
fi

RECORD_DURATION=$(( $(date -d "$END_TIME + 1 day" "+%s") - $(date -d "$START_TIME" "+%s") ))

usage() {
    echo "Usage: $0 [ -d <duration> ] [ -f <filename> ]"
    echo "  -d <duration> : duration of the recording in seconds or 'night' for all night recording"
    echo "  -f <filename> : filename of the recording"
    echo "  -h            : display this help"
    echo "  -v            : switch to VERBOSE mode"
}

# Get command line options
while getopts ":hd:f:" opt; do
  case $opt in
    h) 
      usage
      ;;
    d)
      RECORD_DURATION=$OPTARG
      if [ "$RECORD_DURATION" == "night" ]; then
        RECORD_DURATION=32400
      fi
      ;;
    f)
      RECORD_FILEPATH=$OPTARG
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      exit 1
      ;;
  esac
done


main() {
    # Create output folder
    if $VERBOSE
    then
      echo "Creating record output folder"
    fi
    mkdir -p "$RECORD_DIR/$RECORD_DATE/"

    # Perform recording
    if $VERBOSE
    then
      echo "Recording $RECORD_FILENAME"
    fi
    
    while [[ $(date "+%s") -le $END_TIMESTAMP ]]; do
            rec -b 16 -r 48000 -c 1 -t w64 $RECORD_FILEPATH trim 0 $RECORD_DURATION > /tmp/nbmrec-rec.log
    done
    if $VERBOSE
    then
      echo "Done"
    fi
}

main
exit 0