From dc7948a0ef71dfaafb515f2ebc5d26789896503f Mon Sep 17 00:00:00 2001
From: Minijackson <minijackson@riseup.net>
Date: Fri, 2 Aug 2024 22:26:55 +0200
Subject: usecases/audio-production: configure low-latency pipewire

---
 usecases/desktop/graphical/audio-production.nix | 48 +++++++++++++++++++------
 1 file changed, 38 insertions(+), 10 deletions(-)

(limited to 'usecases')

diff --git a/usecases/desktop/graphical/audio-production.nix b/usecases/desktop/graphical/audio-production.nix
index dfbe2b2..94f7501 100644
--- a/usecases/desktop/graphical/audio-production.nix
+++ b/usecases/desktop/graphical/audio-production.nix
@@ -1,11 +1,7 @@
-inputs: {
-  pkgs,
-  lib,
-  ...
-}: {
-  imports = [
-    "${inputs.musnix}"
-  ];
+inputs:
+{ pkgs, lib, ... }:
+{
+  imports = [ "${inputs.musnix}" ];
 
   musnix.enable = true;
 
@@ -63,10 +59,10 @@ inputs: {
       soundfont-ydp-grand
       soundfont-fluid
     ];
-    extraGroups = ["audio"];
+    extraGroups = [ "audio" ];
   };
 
-  environment.pathsToLink = ["/share/soundfonts"];
+  environment.pathsToLink = [ "/share/soundfonts" ];
 
   # TODO: upstream adding user-specific packages
   environment.variables = {
@@ -77,4 +73,36 @@ inputs: {
     VST_PATH = lib.mkForce "$HOME/.vst:$HOME/.nix-profile/lib/vst:/run/current-system/sw/lib/vst:/etc/profiles/per-user/$USER/lib/vst";
     VST3_PATH = lib.mkForce "$HOME/.vst3:$HOME/.nix-profile/lib/vst3:/run/current-system/sw/lib/vst3:/etc/profiles/per-user/$USER/lib/vst3";
   };
+
+  # https://wiki.nixos.org/wiki/PipeWire#Low-latency_setup
+  services.pipewire.extraConfig = {
+    pipewire."92-low-latency" = {
+      "context.properties" = {
+        "default.clock.rate" = 48000;
+        "default.clock.quantum" = 128;
+        "default.clock.min-quantum" = 128;
+        "default.clock.max-quantum" = 128;
+      };
+    };
+
+    pipewire-pulse."92-low-latency" = {
+      "context.properties" = [
+        {
+          name = "libpipewire-module-protocol-pulse";
+          args = { };
+        }
+      ];
+      "pulse.properties" = {
+        "pulse.min.req" = "128/48000";
+        "pulse.default.req" = "128/48000";
+        "pulse.max.req" = "128/48000";
+        "pulse.min.quantum" = "128/48000";
+        "pulse.max.quantum" = "128/48000";
+      };
+      "stream.properties" = {
+        "node.latency" = "32/48000";
+        "resample.quality" = 1;
+      };
+    };
+  };
 }
-- 
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