sdr-bookmarks

#!/bin/bash

# Copyright (c) 2021 by Philip Collier, radio AB9IL
# This script is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version. There is NO warranty; not even for
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

BOOKMARKS_FILE="~/.config/sdrbookmarks"
UNIT="e6" # Freq units. e6 for MHz, empty for Hz
AM_SAMP="16000" # am sampling rate
FM_SAMP="16000" # fm sampling rate
SQUELCH="170" # squelch level
#------------------------------------------------------------------------------
#-----EDIT BELOW ONLY IF NECESSARY---WATCH FOR DRAGONS-------------------------
#------------------------------------------------------------------------------
OPTION1="Tune SDR Bookmarks"
OPTION2="Stop SDR Bookmarks"
OPTION3="Reset the USB Device"
OPTION4="Edit Bookmarks"
OPTIONS="$OPTION1\n$OPTION2\n$OPTION3\n$OPTION4"
FZF_COMMAND1='fzf --layout=reverse --header=Select:'
ROFI_COMMAND1='rofi -lines 4 -dmenu -p Select'
FZF_COMMAND2='fzf --layout=reverse --header=Select:'
ROFI_COMMAND2='rofi -dmenu -p Select'
FZF_COMMAND3='usbreset-helper'
ROFI_COMMAND3='x-terminal-emulator -e usbreset-helper'
FZF_COMMAND4="vim $BOOKMARKS_FILE"
ROFI_COMMAND4="x-terminal-emulator -e vim $BOOKMARKS_FILE"

#Get the SDR frequency offset (ppm)
CORR=$(cat /usr/local/etc/sdr_offset)
#Get the SDR gain (gain)
GAIN=$(cat /usr/local/etc/sdr_gain)


stop_sdr(){
killall -9 rtl_fm
}

# interface based on commandline arguments
case "$1" in
    gui)
        COMMAND1=$ROFI_COMMAND1
        COMMAND2=$ROFI_COMMAND2
        COMMAND3=$ROFI_COMMAND3
        COMMAND4=$ROFI_COMMAND4
    ;;
    *)
        COMMAND1=$FZF_COMMAND1
        COMMAND2=$FZF_COMMAND2
        COMMAND3=$FZF_COMMAND3
        COMMAND4=$FZF_COMMAND4
    ;;
esac

# select option from first menu instance
SELECTED="$(echo -e "$OPTIONS" | $COMMAND1 )"

case $SELECTED in
  $OPTION1)
    readarray STREAMS < $BOOKMARKS_FILE
    CHOICE="$(echo "${STREAMS[@]}" | awk -F \" '{print $1, $2}' | sed 's/^ //g' | $COMMAND2 )"
    # start the SDR stream
    stop_sdr
    sleep 0.5
    SAMP=""
    SQ=""
    RATE=48000
    FREQ="$(echo "$CHOICE" | awk '{print $1}')"
    MODE="$(echo "$CHOICE" | awk '{print $2}')"
    [[  "$MODE" == "fm" ]] && SAMP="-s $FM_SAMP" && RATE=$FM_SAMP && SQ="-l $SQUELCH"
    [[  "$MODE" == "am" ]] && SAMP="-s $AM_SAMP" && RATE=$AM_SAMP && SQ="-l $SQUELCH"
    rtl_fm -M $MODE -f $FREQ$UNIT -p $CORR $SAMP -g $GAIN $SQ -r $RATE | \
        aplay -r $RATE -t raw -c 1 -f S16_LE 2>&1 &
    ;;
  $OPTION2)
      # cleanly stop the player
      stop_sdr
    ;;
  $OPTION3)
      # reset a USB Device
      $COMMAND3
    ;;
  $OPTION4)
      # edit the bookmarks
      $COMMAND4
    ;;
esac