[Unit]
Description=mpv video player (KMS/DRM -- the actual player)
# Needs the DRM/HDMI + sound devices present; takes over the console VT.
After=local-fs.target systemd-udev-settle.service sound.target
Wants=systemd-udev-settle.service
Conflicts=getty@tty1.service

[Service]
User=${MEDIAPI_USER}
# mpv on DRM/KMS needs: video+render (GPU/DRM), input (remotes/keyboard), audio
# (HDMI/ALSA), tty (own the VT). PAMName=login gives it a real logind session so
# it can take the seat's DRM/input devices.
SupplementaryGroups=video render input audio tty
PAMName=login
TTYPath=/dev/tty1
StandardInput=tty
StandardOutput=journal
StandardError=journal
# Create /run/mediapi (owned by this user) for the IPC socket the app connects to.
RuntimeDirectory=mediapi
# --idle keeps mpv running with no file loaded (holds the playlist between
# clips and after the last one), so the service stays up and the app can always
# reach the socket. Playback is hardware-decoded straight on KMS.
ExecStart=/usr/bin/mpv \
  --idle=yes \
  --input-ipc-server=/run/mediapi/mpv.sock \
  --no-terminal \
  --no-input-default-bindings \
  --fullscreen \
  --force-window=yes \
  --keep-open=no \
  --vo=gpu --gpu-context=drm --hwdec=auto \
  --ao=alsa --audio-device=alsa/hdmi:CARD=vc4hdmi0,DEV=0
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target