nixpkgs/nixos/modules/services/audio/alsa.nix

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# ALSA sound support.
{ config, pkgs, ... }:
with pkgs.lib;
let
inherit (pkgs) alsaUtils;
soundState = "/var/lib/alsa/asound.state";
in
{
###### interface
options = {
sound = {
enable = mkOption {
type = types.bool;
default = true;
description = ''
Whether to enable ALSA sound.
'';
};
enableOSSEmulation = mkOption {
type = types.bool;
default = true;
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description = ''
Whether to enable ALSA OSS emulation (with certain cards sound mixing may not work!).
'';
};
};
};
###### implementation
config = mkIf config.sound.enable {
environment.systemPackages = [ alsaUtils ];
# ALSA provides a udev rule for restoring volume settings.
services.udev.packages = [ alsaUtils ];
boot.kernelModules = optional config.sound.enableOSSEmulation "snd_pcm_oss";
systemd.services."alsa-store" =
{ description = "Store Sound Card State";
wantedBy = [ "multi-user.target" ];
unitConfig.RequiresMountsFor = "/var/lib/alsa";
unitConfig.ConditionVirtualization = "!systemd-nspawn";
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
ExecStart = "${pkgs.coreutils}/bin/mkdir -p /var/lib/alsa";
ExecStop = "${alsaUtils}/sbin/alsactl store --ignore";
};
};
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};
}