🚀 Call a command before something is played and when playing stops

[Huseriato]

Feature Description

What functionality would you like to see in your phoniebox?

I would like to disable the crackling sound of some HifiBerry boards when powering on or off. In my example the HifiBerry MiniAMP. Also I want to stop the little noise, when nothing is played.

How do you envision the feature to work from a users perspective?

There should be no unneeded cracklings. The device should be muted, when not playing anything. The HifiBerry MiniAMP supports a MUTE input on GPIO 16. I created a topic in german Raspberry PI forum explaining the problem (German): https://forum-raspberrypi.de/forum/thread/49514-hifiberry-miniamp-und-das-knacken-im-zusammenhang-mit-dem-onoff-shim/

Further information that might help

Setting GPIO 16 to GND (with a 10kOhm resistor) mutes the HifiBerry MiniAMP. Because the MiniAMP has a 5V Pull up with 10kOhm ths GPIO 16 is considered as in input PIN on Boot time. Grounding it, will set the level to LOW, so the device is muted.

So before playback you can call raspi-gpio set 16 op dh to unmute the MiniAMP. But I need an entry point, without blocking updates. So it would be really nice to execute something before playback, that is not reverted on update. Same for the situation after a playback. I don't know how to deal with system sound situations. May be its more like a trigger named "activate_sound.sh" and "deactivate_sound.sh" or something similar.

[0x0lli]

hi, habe gerade Dein setup gesehen und bin am verzweifeln; was hast Du gemacht, um den rotary encoder zum Laufen zu kriegen? https://github.com/MiczFlor/RPi-Jukebox-RFID/issues/1093#issuecomment-712481154

[Huseriato]

I tried something relative simple to have an event before and after any command. I've added before

https://github.com/MiczFlor/RPi-Jukebox-RFID/blob/develop/scripts/playout_controls.sh#L191

This is my testcode:

if [ -f $PATHDATA/../events/$COMMAND.before.sh ];
then
  if [ "${DEBUG_playout_controls_sh}" == "TRUE" ]; then echo "   Executing ${COMMAND}.before.sh..." >> ${PATHDATA}/../logs/debug.log; fi

  $PATHDATA/../events/$COMMAND.before.sh

  if [ $? != "0" ]; 
  then
    if [ "${DEBUG_playout_controls_sh}" == "TRUE" ]; then echo "   ${COMMAND}.before.sh returned exit code ${?}, ${COMMAND} cancelled." >> ${PATHDATA}/../logs/debug.log; fi
    exit $?
  fi;
fi;

So the idea is, that everyone can place files in ~/RPi-Jukebox-RFID/events with the format <Command>.before.sh or <Command>.after.sh - So it easy to extend the functionally of every command. In the before events the whole command can be cancelled, when sending an exitcode <> 0. I've a similar block like the one above at the end of playout_controls.sh.

Do you think this might be a good idea to implement it this way?