84 lines
1.6 KiB
Nix
84 lines
1.6 KiB
Nix
# ALSA sound support.
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{ config, pkgs, ... }:
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with pkgs.lib;
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let
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inherit (pkgs) alsaUtils;
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soundState = "/var/lib/alsa/asound.state";
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in
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{
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###### interface
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options = {
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sound = {
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enable = mkOption {
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default = true;
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description = ''
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Whether to enable ALSA sound.
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'';
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merge = mergeEnableOption;
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};
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enableOSSEmulation = mkOption {
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default = true;
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description = ''
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Whether to enable ALSA OSS emulation (with certain cards sound mixing may not work!).
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'';
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};
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};
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};
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###### implementation
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config = mkIf config.sound.enable {
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environment.systemPackages = [alsaUtils];
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users.extraGroups = singleton
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{ # Alsalib seems to require the existence of this group, even
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# if it's not used (e.g., doesn't own any devices).
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name = "audio";
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gid = config.ids.gids.audio;
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};
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jobs.alsa =
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{ startOn = "stopped udevtrigger";
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preStart =
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''
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mkdir -m 0755 -p $(dirname ${soundState})
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# Load some additional modules.
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${optionalString config.sound.enableOSSEmulation
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''
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for mod in snd_pcm_oss; do
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${config.system.sbin.modprobe}/sbin/modprobe $mod || true
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done
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''
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}
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# Restore the sound state.
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${alsaUtils}/sbin/alsactl -f ${soundState} restore || true
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'';
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postStop =
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''
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# Save the sound state.
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${alsaUtils}/sbin/alsactl -f ${soundState} store
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'';
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};
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};
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}
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