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Add virtual 4.1 surround sound configuration for zix790prors

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Create a PipeWire virtual surround sink that routes audio to multiple
physical outputs:
- FL/FR channels → AmazonBasics USB speaker
- RL/RR channels → Fosi BT20A PRO Bluetooth speaker
- LFE channel → AmazonBasics (duplicated to both channels)

Uses loopback modules with systemd services to maintain correct routing,
as PipeWire's target.object parameter doesn't auto-connect properly.
A timer checks every 10 seconds and fixes incorrect connections.

Configuration is machine-specific and isolated in virtual-surround.nix.
This commit is contained in:
John Ogle
2025-12-29 12:01:29 -08:00
parent 0a9de8d159
commit 05fed3ede1
2 changed files with 136 additions and 4 deletions
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4
machines/zix790prors/configuration.nix
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@@ -7,9 +7,9 @@
with lib;
{
imports =
[ # Include the results of the hardware scan.
imports = [
./hardware-configuration.nix
./virtual-surround.nix
];
roles = {

132
machines/zix790prors/virtual-surround.nix Normal file
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@@ -0,0 +1,132 @@
# Virtual 4.1 surround sound setup
# Routes FL/FR to AmazonBasics USB speaker, RL/RR to Fosi BT20A PRO Bluetooth speaker
{ pkgs, ... }:
{
services.pipewire.extraConfig.pipewire."10-virtual-surround" = {
"context.objects" = [
{
factory = "adapter";
args = {
"factory.name" = "support.null-audio-sink";
"node.name" = "virtual_surround_sink";
"node.description" = "Virtual 4.1 Surround (AmazonBasics + Fosi)";
"media.class" = "Audio/Sink";
"audio.position" = [ "FL" "FR" "RL" "RR" "LFE" ];
"monitor.channel-volumes" = true;
};
}
];
"context.modules" = [
{
name = "libpipewire-module-loopback";
args = {
"node.description" = "Route Front to AmazonBasics";
"capture.props" = {
"node.name" = "route_front_capture";
"audio.position" = [ "FL" "FR" ];
"stream.dont-remix" = true;
"node.passive" = true;
};
"playback.props" = {
"node.name" = "route_front_playback";
"node.target" = "alsa_output.usb-C-Media_Electronics_Inc._AmazonBasics_Professional_Mic_2-00.analog-stereo";
"audio.position" = [ "FL" "FR" ];
"stream.dont-remix" = true;
};
};
}
{
name = "libpipewire-module-loopback";
args = {
"node.description" = "Route Rear to Fosi Audio";
"capture.props" = {
"node.name" = "route_rear_capture";
"audio.position" = [ "RL" "RR" ];
"stream.dont-remix" = true;
"node.passive" = true;
};
"playback.props" = {
"node.name" = "route_rear_playback";
"node.target" = "bluez_output.F4_4E_FD_FB_58_62.1";
"audio.position" = [ "FL" "FR" ];
"stream.dont-remix" = true;
};
};
}
{
name = "libpipewire-module-loopback";
args = {
"node.description" = "Route Subwoofer to AmazonBasics";
"capture.props" = {
"node.name" = "route_lfe_capture";
"audio.position" = [ "LFE" ];
"stream.dont-remix" = true;
"node.passive" = true;
};
"playback.props" = {
"node.name" = "route_lfe_playback";
"node.target" = "alsa_output.usb-C-Media_Electronics_Inc._AmazonBasics_Professional_Mic_2-00.analog-stereo";
"audio.position" = [ "MONO" ];
"stream.dont-remix" = false;
};
};
}
];
};
# Systemd services to fix PipeWire loopback routing for virtual surround
systemd.user.services.pipewire-surround-link = {
description = "Link virtual surround sink to loopback captures";
after = [ "pipewire.service" "wireplumber.service" ];
requires = [ "pipewire.service" "wireplumber.service" ];
wantedBy = [ "pipewire.service" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = false;
ExecStart = pkgs.writeShellScript "surround-link" ''
sleep 2
# Disconnect wrong connections
${pkgs.pipewire}/bin/pw-link -d alsa_input.pci-0000_00_1f.3.pro-input-2:capture_AUX0 route_front_capture:input_FL 2>/dev/null || true
${pkgs.pipewire}/bin/pw-link -d alsa_input.pci-0000_00_1f.3.pro-input-2:capture_AUX1 route_front_capture:input_FR 2>/dev/null || true
${pkgs.pipewire}/bin/pw-link -d alsa_input.pci-0000_00_1f.3.pro-input-2:capture_AUX0 route_rear_capture:input_RL 2>/dev/null || true
${pkgs.pipewire}/bin/pw-link -d alsa_input.pci-0000_00_1f.3.pro-input-2:capture_AUX1 route_rear_capture:input_RR 2>/dev/null || true
${pkgs.pipewire}/bin/pw-link -d alsa_input.pci-0000_00_1f.3.pro-input-2:capture_AUX0 route_lfe_capture:input_LFE 2>/dev/null || true
# Create correct connections
${pkgs.pipewire}/bin/pw-link virtual_surround_sink:monitor_FL route_front_capture:input_FL 2>/dev/null || true
${pkgs.pipewire}/bin/pw-link virtual_surround_sink:monitor_FR route_front_capture:input_FR 2>/dev/null || true
${pkgs.pipewire}/bin/pw-link virtual_surround_sink:monitor_RL route_rear_capture:input_RL 2>/dev/null || true
${pkgs.pipewire}/bin/pw-link virtual_surround_sink:monitor_RR route_rear_capture:input_RR 2>/dev/null || true
${pkgs.pipewire}/bin/pw-link virtual_surround_sink:monitor_LFE route_lfe_capture:input_LFE 2>/dev/null || true
'';
};
};
systemd.user.services.pipewire-surround-link-check = {
description = "Check and fix surround sink links";
after = [ "pipewire.service" "wireplumber.service" ];
serviceConfig = {
Type = "oneshot";
ExecStart = pkgs.writeShellScript "surround-link-check" ''
if ${pkgs.pipewire}/bin/pw-cli ls Node 2>/dev/null | grep -q "bluez_output.F4_4E_FD_FB_58_62"; then
if ${pkgs.pipewire}/bin/pw-link -l 2>/dev/null | grep -q "route_front_capture:input_FL.*alsa_input"; then
${pkgs.systemd}/bin/systemctl --user start pipewire-surround-link.service
fi
if ! ${pkgs.pipewire}/bin/pw-link -l 2>/dev/null | grep -q "virtual_surround_sink:monitor_FL.*route_front_capture"; then
${pkgs.systemd}/bin/systemctl --user start pipewire-surround-link.service
fi
fi
'';
};
};
systemd.user.timers.pipewire-surround-link-check = {
description = "Periodically check surround sink links";
wantedBy = [ "default.target" ];
timerConfig = {
OnStartupSec = "10s";
OnUnitActiveSec = "10s";
Unit = "pipewire-surround-link-check.service";
};
};
}