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modules/pipewireLowLatency: use modular config files #59

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Apr 3, 2023
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modules/pipewireLowLatency: use modular config files #59

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115 changes: 54 additions & 61 deletions modules/pipewireLowLatency.nix
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Original file line number Diff line number Diff line change
@@ -1,92 +1,85 @@
{
config,
lib,
pkgs,
...
}:
# low-latency PipeWire configuration
# extends the nixpkgs module
let
cfg = config.services.pipewire.lowLatency;
qr = "${toString cfg.quantum}/${toString cfg.rate}";
json = pkgs.formats.json {};
in {
options = {
services.pipewire.lowLatency = {
enable = lib.mkEnableOption "Enable low latency";
enable = lib.mkEnableOption (lib.mdDoc "Enable low latency");

quantum = lib.mkOption {
description = "Minimum quantum to set";
description = lib.mdDoc "Minimum quantum to set";
type = lib.types.int;
default = 64;
example = 32;
};

rate = lib.mkOption {
description = "Rate to set";
description = lib.mdDoc "Rate to set";
type = lib.types.int;
default = 48000;
example = 96000;
};
};
};

config = let
qr = "${toString cfg.quantum}/${toString cfg.rate}";
in
lib.mkIf cfg.enable {
services.pipewire = {
config = {
# pipewire native config
pipewire = {
"context.properties" = {"default.clock.min-quantum" = cfg.quantum;};
};

# pulse clients config
pipewire-pulse = {
"context.properties" = {};
"context.modules" = [
{
name = "libpipewire-module-rtkit";
args = {
"nice.level" = -15;
"rt.prio" = 88;
"rt.time.soft" = 200000;
"rt.time.hard" = 200000;
};
flags = ["ifexists" "nofail"];
}
{name = "libpipewire-module-protocol-native";}
{name = "libpipewire-module-client-node";}
{name = "libpipewire-module-adapter";}
{name = "libpipewire-module-metadata";}
{
name = "libpipewire-module-protocol-pulse";
args = {
"pulse.min.req" = qr;
"pulse.min.quantum" = qr;
"pulse.min.frag" = qr;
"server.address" = ["unix:native"];
};
}
];
config = lib.mkIf cfg.enable {
# pipewire native config
environment.etc = {
"pipewire/pipewire.d/99-lowlatency.conf".source = json.generate "99-lowlatency.conf" {
context.properties.default.clock.min-quantum = cfg.quantum;
};

"stream.properties" = {
"node.latency" = qr;
"resample.quality" = 1;
# pulse clients config
"pipewire/pipewire-pulse.d/99-lowlatency.conf".source = json.generate "99-lowlatency.conf" {
context.modules = [
{
name = "libpipewire-module-rtkit";
args = {
nice.level = -15;
rt.prio = 88;
rt.time.soft = 200000;
rt.time.hard = 200000;
};
};
};
# lower latency alsa format
media-session.config.alsa-monitor = {
rules = [
{
matches = [{node.name = "alsa_output.*";}];
actions = {
update-props = {
"audio.format" = "S32LE";
"audio.rate" = cfg.rate * 2;
"api.alsa.period-size" = 2;
};
};
}
];
flags = ["ifexists" "nofail"];
}
{
name = "libpipewire-module-protocol-pulse";
args = {
pulse.min.req = qr;
pulse.min.quantum = qr;
pulse.min.frag = qr;
server.address = ["unix:native"];
};
}
];

stream.properties = {
node.latency = qr;
resample.quality = 1;
};
};

"wireplumber/main.lua.d/99-alsa-lowlatency.lua".text = ''
alsa_monitor.rules = {
{
matches = {{{ "node.name", "matches", "alsa_output.*" }}};
apply_properties = {
["audio.format"] = "S32LE",
["audio.rate"] = ${toString (cfg.rate * 2)},
["api.alsa.period-size"] = 2,
},
},
}
'';
};
};
}