138 lines
3.6 KiB
Nix
138 lines
3.6 KiB
Nix
# source: https://github.com/fufexan/nix-gaming/raw/master/modules/pipewireLowLatency.nix
|
|
{
|
|
config,
|
|
pkgs,
|
|
lib,
|
|
...
|
|
}:
|
|
let
|
|
inherit (lib.modules) mkIf;
|
|
inherit (lib.options) mkOption mkEnableOption;
|
|
inherit (lib.types) int;
|
|
inherit (lib.generators) toLua;
|
|
|
|
cfg = config.services.pipewire.lowLatency;
|
|
qr = "${toString cfg.quantum}/${toString cfg.rate}";
|
|
in
|
|
{
|
|
# low-latency PipeWire configuration
|
|
# extends the nixpkgs module
|
|
meta.maintainers = with lib.maintainers; [ fufexan ];
|
|
|
|
options = {
|
|
services.pipewire.lowLatency = {
|
|
enable = mkEnableOption ''
|
|
low latency for PipeWire. This will also set `services.pipewire.enable` and
|
|
`services.pipewire.wireplumber.enable` to true.
|
|
'';
|
|
|
|
quantum = mkOption {
|
|
description = "Minimum quantum to set";
|
|
type = int;
|
|
default = 64;
|
|
example = 32;
|
|
};
|
|
|
|
rate = mkOption {
|
|
description = "Rate to set";
|
|
type = int;
|
|
default = 48000;
|
|
example = 96000;
|
|
};
|
|
};
|
|
};
|
|
|
|
config = mkIf cfg.enable {
|
|
services.pipewire = {
|
|
# make sure PipeWire is enabled if the module is imported
|
|
# and low latency is enabledd
|
|
enable = true;
|
|
|
|
# write extra config
|
|
extraConfig.pipewire = {
|
|
"99-lowlatency" = {
|
|
context = {
|
|
properties.default.clock.min-quantum = cfg.quantum;
|
|
modules = [
|
|
{
|
|
name = "libpipewire-module-rtkit";
|
|
flags = [
|
|
"ifexists"
|
|
"nofail"
|
|
];
|
|
args = {
|
|
nice.level = -15;
|
|
rt = {
|
|
prio = 88;
|
|
time.soft = 200000;
|
|
time.hard = 200000;
|
|
};
|
|
};
|
|
}
|
|
{
|
|
name = "libpipewire-module-protocol-pulse";
|
|
args = {
|
|
server.address = [ "unix:native" ];
|
|
pulse.min = {
|
|
req = qr;
|
|
quantum = qr;
|
|
frag = qr;
|
|
};
|
|
};
|
|
}
|
|
];
|
|
|
|
stream.properties = {
|
|
node.latency = qr;
|
|
resample.quality = 1;
|
|
};
|
|
};
|
|
};
|
|
};
|
|
|
|
# ensure WirePlumber is enabled explicitly (defaults to true while PW is enabled)
|
|
# and write extra config to ship low latency rules for alsa
|
|
wireplumber = {
|
|
enable = true;
|
|
configPackages =
|
|
let
|
|
# generate "matches" section of the rules
|
|
matches =
|
|
toLua
|
|
{
|
|
multiline = false; # looks better while inline
|
|
indent = false;
|
|
}
|
|
[
|
|
[
|
|
[
|
|
"node.name"
|
|
"matches"
|
|
"alsa_output.*"
|
|
]
|
|
]
|
|
]; # nested lists are to produce `{{{ }}}` in the output
|
|
|
|
# generate "apply_properties" section of the rules
|
|
apply_properties = toLua { } {
|
|
"audio.format" = "S32LE";
|
|
"audio.rate" = cfg.rate * 2;
|
|
"api.alsa.period-size" = 2;
|
|
};
|
|
in
|
|
[
|
|
(pkgs.writeTextDir "share/lowlatency.lua.d/99-alsa-lowlatency.lua" ''
|
|
-- Generated by nix-gaming
|
|
alsa_monitor.rules = {
|
|
{
|
|
matches = ${matches};
|
|
apply_properties = ${apply_properties};
|
|
}
|
|
}
|
|
'')
|
|
];
|
|
};
|
|
};
|
|
};
|
|
}
|