volumegui.py

from nicegui import ui, app
import alsaaudio as audio

cards = audio.cards()
card = cards[2]
assert card == "ICUSBAUDIO7D"
mixer = audio.Mixer("Speaker", cardindex=2)

def get_volume():
    return muted_volume or mixer.getvolume()[0]

def set_volume(value):
    if muted_volume is not None:
        toggle_mute()
    if value < 0:
        value = 0
    elif value > 100:
        value = 100
    mixer.setvolume(value)
    lbl_vol.set_text(f'{value}%')
    sld_vol.set_value(value)

muted_volume = None

if get_volume() == 0:
    muted_volume = 15

def toggle_mute():
    global muted_volume
    if muted_volume is None:
        old = get_volume()
        set_volume(0)
        muted_volume = old
        btn_mute.classes(add="bg-red")
    else:
        old = muted_volume
        muted_volume = None
        set_volume(old)
        btn_mute.classes(remove="bg-red")

def restart_service():
    from os import system
    system("sudo systemctl restart spdifloop")

with ui.column().classes(add="w-full").style(add="height: 100vh"):
    with ui.row():
        ui.label('Volume serveur')
        ui.button('🔄', on_click=lambda: restart_service())
    lbl_vol = ui.label('0%')
    sld_vol = ui.slider(min=0, max=100, value=0, on_change=lambda args: set_volume(args.value))
    with ui.grid(rows=3).classes(add="w-full").style(add="flex-grow: 1"):
        ui.button('🔊', on_click=lambda: set_volume(get_volume() + 7)).classes(add="big")
        ui.button('🔉', on_click=lambda: set_volume(get_volume() - 7)).classes(add="big")
        btn_mute = ui.button("🔇", on_click=lambda: toggle_mute()).classes(add="big")

set_volume(get_volume())

ui.query(".nicegui-content").style("height: calc(100vh - 10em)")
ui.query("body, html").style("margin: 0; padding: 0")
ui.query(".big").classes(add="w-full").style("font-size: 500%; padding: 0")

@app.get("/spdifloop.webmanifest")
def manifest():
    return {
        "name": "Volume",
        "short_name": "Volume",
        "start_url": "/",
        "display": "standalone",
        "background_color": "#000",
        "theme_color": "#000",
        "icons": [
            {
                "src": "https://domino.zdimension.fr/apps/domino.svg",
                "sizes": "512x512",
                "type": "image/svg+xml"
            }
        ]
    }

@app.get("/sw.js")
def sw():
    return """
    self.addEventListener('install', function(event) {});
    self.addEventListener('fetch', function(event) {});
    self.addEventListener('activate', function(event) {});
    """

ui.add_head_html('<link rel="manifest" href="/spdifloop.webmanifest">')
ui.add_body_html("""
    <script>
        if ('serviceWorker' in navigator) {
            navigator.serviceWorker.register('/sw.js');
        }
    </script>
""")

ui.run(port=8765, show=False)