Merge pull request #93725 from nglen/pipewire

1 files changed, 68 insertions, 4 deletions

diff --git a/nixos/modules/services/desktops/pipewire.nix b/nixos/modules/services/desktops/pipewire.nix
index 5aee59cfdcce..5179cbaf6bc2 100644
--- a/nixos/modules/services/desktops/pipewire.nix
+++ b/nixos/modules/services/desktops/pipewire.nix
@@ -5,8 +5,22 @@ with lib;
 
 let
   cfg = config.services.pipewire;
-  packages = with pkgs; [ pipewire ];
+  enable32BitAlsaPlugins = cfg.alsa.support32Bit
+                           && pkgs.stdenv.isx86_64
+                           && pkgs.pkgsi686Linux.pipewire != null;
 
+  # The package doesn't output to $out/lib/pipewire directly so that the
+  # overlays can use the outputs to replace the originals in FHS environments.
+  #
+  # This doesn't work in general because of missing development information.
+  jack-libs = pkgs.runCommand "jack-libs" {} ''
+    mkdir -p "$out/lib"
+    ln -s "${pkgs.pipewire.jack}/lib" "$out/lib/pipewire"
+  '';
+  pulse-libs = pkgs.runCommand "pulse-libs" {} ''
+    mkdir -p "$out/lib"
+    ln -s "${pkgs.pipewire.pulse}/lib" "$out/lib/pipewire"
+  '';
 in {
 
   meta = {
@@ -25,17 +39,67 @@ in {
           Automatically run pipewire when connections are made to the pipewire socket.
         '';
       };
+
+      alsa = {
+        enable = mkEnableOption "ALSA support";
+        support32Bit = mkEnableOption "32-bit ALSA support on 64-bit systems";
+      };
+
+      jack = {
+        enable = mkEnableOption "JACK audio emulation";
+      };
+
+      pulse = {
+        enable = mkEnableOption "PulseAudio emulation";
+      };
     };
   };
 
 
   ###### implementation
   config = mkIf cfg.enable {
-    environment.systemPackages = packages;
+    assertions = [
+      {
+        assertion = cfg.pulse.enable -> !config.hardware.pulseaudio.enable;
+        message = "PipeWire based PulseAudio emulation doesn't use the PulseAudio service";
+      }
+      {
+        assertion = cfg.jack.enable -> !config.services.jack.jackd.enable;
+        message = "PIpeWire based JACK emulation doesn't use the JACK service";
+      }
+    ];
+
+    environment.systemPackages = [ pkgs.pipewire ]
+                                 ++ lib.optional cfg.jack.enable jack-libs
+                                 ++ lib.optional cfg.pulse.enable pulse-libs;
 
-    systemd.packages = packages;
+    systemd.packages = [ pkgs.pipewire ];
 
+    # PipeWire depends on DBUS but doesn't list it. Without this booting
+    # into a terminal results in the service crashing with an error.
     systemd.user.sockets.pipewire.wantedBy = lib.mkIf cfg.socketActivation [ "sockets.target" ];
-  };
+    systemd.user.services.pipewire.bindsTo = [ "dbus.service" ];
+    services.udev.packages = [ pkgs.pipewire ];
 
+    # If any paths are updated here they must also be updated in the package test.
+    sound.extraConfig = mkIf cfg.alsa.enable ''
+      pcm_type.pipewire {
+        libs.native = ${pkgs.pipewire.lib}/lib/alsa-lib/libasound_module_pcm_pipewire.so ;
+        ${optionalString enable32BitAlsaPlugins
+          "libs.32Bit = ${pkgs.pkgsi686Linux.pipewire.lib}/lib/alsa-lib/libasound_module_pcm_pipewire.so ;"}
+      }
+      pcm.!default {
+        @func getenv
+        vars [ PCM ]
+        default "plug:pipewire"
+        playback_mode "-1"
+        capture_mode "-1"
+      }
+    '';
+    environment.etc."alsa/conf.d/50-pipewire.conf" = mkIf cfg.alsa.enable {
+      source = "${pkgs.pipewire}/share/alsa/alsa.conf.d/50-pipewire.conf";
+    };
+    environment.sessionVariables.LD_LIBRARY_PATH =
+      lib.optional (cfg.jack.enable || cfg.pulse.enable) "/run/current-system/sw/lib/pipewire";
+  };
 }