# OPTIONAL. Copy to ~/.config/pipewire/pipewire.conf.d/60-echo-cancel.conf on the Pi
# (drop the ".optional") only if the robot hears its own voice and Hermes keeps
# interrupting itself (barge-in tripped by speaker bleed).
#
# It creates an echo-cancelled mic ("robot_ec_source") and a matching speaker
# ("robot_ec_sink"). After enabling it, uncomment the pulse.device lines in the
# Omarchy tunnel config (host/omarchy/50-robot-tunnel.conf) so the tunnels use these nodes instead of the
# raw ones.
#
# UNTESTED: it only matters once the speakers are fitted (the robot has none yet). WebRTC echo
# cancellation costs some CPU, and the Pi 4 already runs the whole robot with about 40% of the machine
# idle; check `top` and `robot://status` (temperature) after enabling it.

context.modules = [
    {   name = libpipewire-module-echo-cancel
        args = {
            library.name   = aec/libspa-aec-webrtc
            capture.props  = { node.name = "robot_ec_capture"  node.passive = true }
            source.props   = { node.name = "robot_ec_source"   node.description = "Robot mic (echo-cancelled)" }
            sink.props     = { node.name = "robot_ec_sink"     node.description = "Robot speaker (echo-cancelled)" }
            playback.props = { node.name = "robot_ec_playback" node.passive = true }
        }
    }
]