[mythtv-users] starting amp from MythTV

[Richard Morton]

I resolved this by writing a very simply script and starting it once
an hour with cron. This requires two keys to be setup in LIRC. It is
designed (and tested on) an amp which has separate power on and off
buttons, but only a minor change is required for amps that have a
single toggle button. At that moment if the menu is showing and the
script is restarted a confirmation on or off signal is sent.

R



#!/bin/bash
PATH=/usr/bin:/bin

# loop for just over an hour; so the next start of the
# script (in an hours time, started using CRON) slightly overlaps
for ((i=0;i<=3690;i+=1))
do
    # determine if power management is disabled (playback
    # is in progress); in which case skip changing the
    # amp power with an IR signal. And set the previous
    # state as monitor is on for next comparison.
    DPMS=`xset -q -display :0.0 | grep "DPMS is Disabled"`
    DPMSSTATE=${DPMS:2:16}
    if [ "$DPMSSTATE" = "DPMS is Disabled" ]
    then
        PREVIOUSSTATE="Monitor is On"
        # echo "DPMS is Disabled; therefore Monitor is On"
    else
        # get monitor state; on or off
        MONITOR=`xset -q -display :0.0 | grep "Monitor is"`
        MONITORSTATE=${MONITOR:2:13}
        # echo $MONITORSTATE
        if [ "${MONITORSTATE}" = "Monitor is On" ]
        then
            # if the PreviousState isnt set, or is the same
            # dont send the IR signal, or vice versa
            if [ "${PREVIOUSSTATE}" != "Monitor is On" ]
            then
                # irsend goes here to turn amp on
                /usr/bin/irsend SEND_ONCE RC-901 KEY_POWER
            fi
        else
            if [ "${PREVIOUSSTATE}" != "Monitor is Of" ]
            then
                # irsend goes here to turn amp off
                /usr/bin/irsend SEND_ONCE RC-901 KEY_POWER2
            fi
        fi
        # set the current state as the next state for the
        # next run around the loop.
        PREVIOUSSTATE=$MONITORSTATE
    fi
    # wait a second and run the loop again
    sleep 1
done