119 lines
3.0 KiB
Org Mode
119 lines
3.0 KiB
Org Mode
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#+title: Sound
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#+setupfile: ../headers
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* Sound
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I use Pipewire for audio on my desktop machines, with a couple of
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compatibility layers and bits of hardware-specific support switched on
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as needed. Here’s the skeleton of the =nixos.sound= module.
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#+begin_src nix :tangle yes
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{
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flake.modules.nixos.sound = {
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lib,
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config,
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pkgs,
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...
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}:
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with lib; let
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cfg = config.mySystem.hardware.sound;
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in {
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options.mySystem.hardware.sound = {
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<<opt-noisetorch>>
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<<opt-scarlett>>
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<<opt-alsa>>
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<<opt-jack>>
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<<opt-package>>
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};
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config = {
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<<scarlett-package>>
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<<pipewire-config>>
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<<noisetorch-config>>
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};
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};
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}
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#+end_src
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** Noise Suppression
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=noisetorch= toggles [[https://github.com/noisetorch/NoiseTorch][NoiseTorch]], a real-time microphone noise
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suppression tool I use for calls, so I have an option for that.
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#+name: opt-noisetorch
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#+begin_src nix
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noisetorch = mkEnableOption "Whether to activate noisetorch support";
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#+end_src
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Passing it to NixOS is quite simple.
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#+name: noisetorch-config
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#+begin_src nix
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programs.noisetorch.enable = cfg.noisetorch;
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#+end_src
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** Scarlett Sound Card
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=scarlett.enable= is for the machine =marpa= with a Focusrite Scarlett 2i2
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audio interface plugged in; it only pulls in that card’s control GUI.
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#+name: opt-scarlett
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#+begin_src nix
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scarlett.enable = mkEnableOption "Activate support for Scarlett sound card";
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#+end_src
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It is installed quite easily in enabled.
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#+name: scarlett-package
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#+begin_src nix
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environment.systemPackages = mkIf cfg.scarlett.enable [pkgs.alsa-scarlett-gui];
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#+end_src
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** Enabling Pipewire
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Enabling Pipewire also means explicitly turning PulseAudio off, since
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the two can’t run as the system’s sound server at the same time.
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#+name: pipewire-config
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#+begin_src nix
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services = {
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pipewire = {
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enable = true;
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alsa = mkIf cfg.alsa {
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enable = mkDefault true;
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support32Bit = mkDefault true;
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};
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jack.enable = mkDefault cfg.jack;
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};
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pulseaudio.enable = false;
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};
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#+end_src
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** ALSA Compatibility
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=alsa= enables Pipewire’s ALSA compatibility layer, on by default since
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most of my audio software still expects ALSA.
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#+name: opt-alsa
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#+begin_src nix
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alsa = mkOption {
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type = types.bool;
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example = true;
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default = true;
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description = "Whether to enable ALSA support with Pipewire";
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};
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#+end_src
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** JACK Compatibility
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=jack= enables Pipewire’s JACK compatibility layer, off by default since
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only my production machine needs it.
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#+name: opt-jack
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#+begin_src nix
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jack = mkOption {
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type = types.bool;
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example = true;
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default = false;
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description = "Whether to enable JACK support with Pipewire";
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};
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#+end_src
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** Base Package
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=package= picks which PulseAudio package to build things on top of.
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#+name: opt-package
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#+begin_src nix
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package = mkOption {
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type = types.package;
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example = pkgs.pulseaudio;
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default = pkgs.pulseaudioFull;
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description = "Which base package to use for PulseAudio";
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};
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#+end_src
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