nixpkgs/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 {
default = true;
description = ''
Whether to enable ALSA sound.
'';
merge = mergeEnableOption;
};
enableOSSEmulation = mkOption {
default = true;
description = ''
Whether to enable ALSA OSS emulation (with certain cards sound mixing may not work!).
'';
};
};
};
###### implementation
config = mkIf config.sound.enable {
environment.systemPackages = [ alsaUtils ];
boot.kernelModules = optional config.sound.enableOSSEmulation "snd_pcm_oss";
jobs.alsa =
{ startOn = "stopped udevtrigger";
preStart =
''
mkdir -m 0755 -p $(dirname ${soundState})
# Restore the sound state.
${alsaUtils}/sbin/alsactl --ignore -f ${soundState} restore
'';
postStop =
''
# Save the sound state.
${alsaUtils}/sbin/alsactl --ignore -f ${soundState} store
'';
};
};
}