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pipewire-low-latency: split to reusable module

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Katherina Walshe-Grey 2024-09-12 11:38:17 +01:00
parent c5261caa21
commit a2cb35148c
3 changed files with 61 additions and 0 deletions
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2
hosts/kilgharrah/default.nix
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@ -24,6 +24,8 @@
console.keyMap = "uk";
services.xserver.xkb.layout = "gb";
qenya.services.pipewire.lowLatency.enable = true;
age.secrets.user-password-kilgharrah-qenya.file = ../../secrets/user-password-kilgharrah-qenya.age;
users.users.qenya.hashedPasswordFile = config.age.secrets.user-password-kilgharrah-qenya.path;
users.users.qenya.extraGroups = [ "wheel" ];

1
services/default.nix
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@ -1,5 +1,6 @@
{
imports = [
./forgejo.nix
./pipewire-low-latency.nix
];
}

58
services/pipewire-low-latency.nix Normal file
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@ -0,0 +1,58 @@
{ config, lib, pkgs, ... }:
let
inherit (lib) mkIf mkEnableOption;
cfg = config.qenya.services.pipewire.lowLatency;
in
{
options.qenya.services.pipewire.lowLatency = {
enable = mkEnableOption "config to decrease sound latency (increasing CPU load) for e.g. streaming";
# TODO: might be an idea to have the numbers be configurable
};
config = mkIf cfg.enable {
# TODO: needs more testing
services.pipewire.extraConfig = {
pipewire."92-low-latency" = {
context.properties = {
default.clock.rate = 48000;
default.clock.quantum = 32;
default.clock.min-quantum = 32;
default.clock.max-quantum = 32;
};
};
pipewire-pulse."92-low-latency" = {
context.modules = [
{
name = "libpipewire-module-protocol-pulse";
args = {
pulse.min.req = "32/48000";
pulse.default.req = "32/48000";
pulse.max.req = "32/48000";
pulse.min.quantum = "32/48000";
pulse.max.quantum = "32/48000";
};
}
];
stream.properties = {
node.latency = "32/48000";
resample.quality = 1;
};
};
};
# Available from NixOS 24.11. Lifted from https://nixos.wiki/wiki/PipeWire - probably need to adjust numbers
# services.pipewire.wireplumber.extraLuaConfig.main."99-alsa-lowlatency" = ''
# alsa_monitor.rules = {
# {
# matches = {{{ "node.name", "matches", "alsa_output.*" }}};
# apply_properties = {
# ["audio.format"] = "S32LE",
# ["audio.rate"] = "96000", -- for USB soundcards it should be twice your desired rate
# ["api.alsa.period-size"] = 2, -- defaults to 1024, tweak by trial-and-error
# -- ["api.alsa.disable-batch"] = true, -- generally, USB soundcards use the batch mode
# },
# },
# }
# '';
};
}