Switching relay during playback

mpegster · July 25, 2023 at 8:53 AM

Hello everybody,

is it possible to query the current playback status?

Background: I run Libreelec 11 on a Raspberry Pi in my children's room as an "audio player" for my daughter. I would like to switch on an amplifier as soon as the playback starts, and switch it off again shortly after the playback has ended. In terms of hardware, this is not a problem for me, but what about Libreelec? Is it possible to query the playback status (plugin?) and switch a GPIO to high or low accordingly?

Thank you for your answers

**HiassofT** · July 25, 2023 at 11:55 AM

You can do this with Kodi's JSON-RPC API, it also supports notifications on playback start/end.

JSON-RPC API - Official Kodi Wiki

Make sure you have "Allow remote control from applications on this system" enabled in Kodi settings->Services->Control

To test this functionality on LE you can use texturecache.py monitor - this will print the notifications sent by kodi. eg when playing a movie:

Code

LibreELEC:~ # texturecache.py monitor
2023-07-25 12:47:13.082270: Playlist.OnAdd       : {"item": {"title": "H264_01_1080i_25-mobcal_ter.mkv", "type": "movie"}, "playlistid": 1, "position": 0}
2023-07-25 12:47:13.132988: Player.OnPlay        : {"item": {"title": "H264_01_1080i_25-mobcal_ter.mkv", "type": "movie"}, "player": {"playerid": 1, "speed": 1}}
2023-07-25 12:47:13.885345: Player.OnAVChange    : {"item": {"title": "H264_01_1080i_25-mobcal_ter.mkv", "type": "movie"}, "player": {"playerid": 1, "speed": 1}}
2023-07-25 12:47:13.894253: Player.OnAVStart     : {"item": {"title": "H264_01_1080i_25-mobcal_ter.mkv", "type": "movie"}, "player": {"playerid": 1, "speed": 1}}
2023-07-25 12:47:13.905896: Player.OnAVChange    : {"item": {"title": "H264_01_1080i_25-mobcal_ter.mkv", "type": "movie"}, "player": {"playerid": 1, "speed": 1}}
2023-07-25 12:47:23.863005: VideoLibrary.OnUpdate: {"id": -1, "type": ""}
2023-07-25 12:47:23.893663: Player.OnStop        : {"end": true, "item": {"title": "H264_01_1080i_25-mobcal_ter.mkv", "type": "movie"}}

Have a look at /usr/bin/texturecache.py to see how that's implemented

so long,

Hias

mpegster · July 25, 2023 at 8:32 PM

Thanks i will take a look.

Mario77 · July 26, 2023 at 10:34 AM

You need something like Callbacks addon..

You have many options in addon to choose from...you just need to run a small script on play media..

Assuming your songs are in a folder called Music or Songs and you know how to connect relay etc this is all you need to run..

something like this...

Code

import xbmc
import os
import signal
import sys
sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup (26, GPIO.OUT) # pin 37 relay

path = xbmc.getInfoLabel('Player.Folderpath')
if "My_Music" in path or "My_Songs" in path:
    GPIO.output(26, GPIO.HIGH)
else:
    GPIO.output(26, GPIO.LOW)

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mpegster · July 26, 2023 at 11:08 AM

Thanks alot

I have other paths, but I was able to adapt them relatively easily and it already works in my test setup.

Mario77 · July 26, 2023 at 11:29 AM Best Answer

You can probably also set the calbacks addon to "on playback started" and on "playback stopped"

Code

# on playback started task 1
import xbmc
import os
import signal
import sys
sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup (26, GPIO.OUT) # pin 37 relay
GPIO.output(26, GPIO.HIGH)

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Code

# on playback stopped task 2
import xbmc
import os
import signal
import sys
sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup (26, GPIO.OUT) # pin 37 relay
GPIO.output(26, GPIO.LOW)

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Switching relay during playback

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