#!/bin/bash
#
# Reads the signal strength from a DVB-c/s/t tuner
#
# (c) 2009 i.dobson@planet-ian.com
#
# Magic markers (optional):
#%# family=auto
#%# capabilities=autoconf suggest

#Change this value to point to the tuner you want to watch
Tuner=1

case $1 in
    autoconf|detect)
        if [ -e  /dev/dvb/adapter$Tuner/ ] ; then
            echo yes
            exit 0
        else
            echo "no (dvb tuner $Tuner not found)"
            exit 1
        fi;;
    config)
        echo 'graph_title  DVB signal strength '
        echo 'graph_args --base 1000 -l 0'
        echo 'graph_vlabel Signal Strength % / Errors in 000s'
        echo 'graph_category mythtv'
        echo 'graph_scale no'

        echo "signal.label Signal strength"
        echo "signal.draw LINE1"
        echo "signal.min 0"

        echo "snr.label Signal to noise"
        echo "snr.draw LINE1"
        echo "snr.min 0"

        echo "ber.label Bit error rate (in millions)"
        echo "ber.draw LINE1"
        echo "ber.min 0"

        echo "unc.label Uncorrectable errors (in thousands)"
        echo "unc.draw LINE1"
        echo "unc.min 0"
    exit 0;;
esac

if [ -e  /dev/dvb/adapter$Tuner/ ] ; then
  check=`femon -H -c 1 -a $Tuner | grep signal `
  echo $check | awk '{printf "signal.value %.0f\nsnr.value %.0f\nber.value %.2f\nunc.value %.2f\n\n",$5,$8,$11/1000,$14/1000000}'
 else
  echo "snr.value 0"
  echo "unc.value 0"
  echo "ber.value 0"
  echo "signal.value 0"
fi

exit 0