Přepnutí výstupu zvuku od remote control

Kód:
# -*- coding: utf-8 -*-

# LibreELEC / Kodi Omega: přepínání USB zvukové karty <-> HDMI

# Spouští se přes keymaps xml, tlačítkem ovladače mapovaným na tento skript



# 1

import json

import xbmc

import xbmcgui



SETTING = "audiooutput.audiodevice"



USB_DEVICE = "ALSA:@:CARD=Device,DEV=0|USB Advanced Audio Device"

HDMI_DEVICE = "ALSA:hdmi:CARD=vc4hdmi,DEV=0|vc4-hdmi (vc4hdmi)"

USB_CARD_NAME = "USB Advanced Audio Device"



# 2

def rpc(method, params=None):

    request = {"jsonrpc": "2.0", "method": method, "id": 1}

    if params is not None:

        request["params"] = params

    raw = xbmc.executeJSONRPC(json.dumps(request))

    try:

        return json.loads(raw)

    except Exception:

        return {"error": {"message": "Neplatná odpověď JSON-RPC"}}



# 3

def notify(message):

    xbmcgui.Dialog().notification(

        "Zvukový výstup",

        message,

        xbmcgui.NOTIFICATION_INFO,

        2500

    )



# 4

def usb_card_available():

    try:

        with open("/proc/asound/cards", "r") as cards_file:

            return USB_CARD_NAME.lower() in cards_file.read().lower()

    except (IOError, OSError):

        return False



# 5

current_response = rpc(

    "Settings.GetSettingValue",

    {"setting": SETTING}

)



if "error" in current_response or "result" not in current_response:

    notify("Nelze zjistit aktuální výstup")

else:

    current = str(current_response["result"].get("value", ""))

    usb_available = usb_card_available()



# 6

    if not usb_available:

        target = HDMI_DEVICE

        fallback_message = True

    elif current.startswith("ALSA:hdmi:CARD=vc4hdmi,DEV=0"):

        target = USB_DEVICE

        fallback_message = False

    else:

        target = HDMI_DEVICE

        fallback_message = False



# 7

    set_response = rpc(

        "Settings.SetSettingValue",

        {

            "setting": SETTING,

            "value": target

        }

    )



# 8

    if "error" in set_response or set_response.get("result") is not True:

        notify("Přepnutí zvuku se nezdařilo")

    elif fallback_message:

        notify("USB audio nedostupné")

    elif target == USB_DEVICE:

        notify("Výstup: USB audio jack 3,5 mm")

    else:

        notify("Výstup: HDMI")