nixdots/system/shared/multimedia/sound/pipewire.nix

127 lines
3.9 KiB
Nix
Raw Normal View History

2024-05-15 19:24:55 +00:00
{
config,
pkgs,
lib,
...
}: let
inherit (lib.modules) mkIf;
inherit (lib.lists) optionals;
inherit (lib.generators) toLua;
cfg = config.myOptions.system.sound;
2024-06-23 22:27:54 +00:00
cfgBluetooth = config.myOptions.device.bluetooth;
2024-05-15 19:24:55 +00:00
in {
config = mkIf cfg.enable {
# in case pipewire was force disabled for whatever reason, fall
# back to PulseAudio to ensure that we still have audio. I do not
# like PA, but bad audio is better than no audio. Though we should
# always use PipeWire where available
hardware.pulseaudio.enable = !config.services.pipewire.enable;
# able to change scheduling policies, e.g. to SCHED_RR
# sounds server use RealtimeKit (rtkti) to acquire
# realtime priority
security.rtkit.enable = config.services.pipewire.enable;
# enable pipewire and configure it for low latency
# the below configuration may not fit every use case
# and you are recommended to experiment with the values
# in order to find the perfect configuration
services = {
pipewire = let
quantum = 64;
rate = 48000;
qr = "${toString quantum}/${toString rate}";
in {
enable = true;
# emulation layers
audio.enable = true;
pulse.enable = true; # PA server emulation
jack.enable = true; # JACK audio emulation
alsa.enable = true; # Alsa emulation
extraConfig.pipewire."99-lowlatency" = {
context = {
properties.default.clock.min-quantum = 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;
};
};
};
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" = rate * 2;
"api.alsa.period-size" = 2;
};
in
[
(pkgs.writeTextDir "share/lowlatency.lua.d/99-alsa-lowlatency.lua" ''
alsa_monitor.rules = {
{
matches = ${matches};
apply_properties = ${apply_properties};
}
}
'')
]
++ optionals cfgBluetooth.enable [
(pkgs.writeTextDir "share/bluetooth.lua.d/51-bluez-config.lua" ''
bluez_monitor.properties = {
["bluez5.enable-sbc-xq"] = true,
["bluez5.enable-msbc"] = true,
["bluez5.enable-hw-volume"] = true,
["bluez5.headset-roles"] = "[ hsp_hs hsp_ag hfp_hf hfp_ag ]"
}
'')
];
};
};
};
systemd.user.services = {
pipewire.wantedBy = ["default.target"];
pipewire-pulse.wantedBy = ["default.target"];
};
};
}