129 lines
3.2 KiB
Nix
129 lines
3.2 KiB
Nix
# ALSA sound support.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (pkgs) alsaUtils;
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pulseaudioEnabled = config.hardware.pulseaudio.enable;
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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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type = types.bool;
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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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};
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enableOSSEmulation = mkOption {
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type = types.bool;
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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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extraConfig = mkOption {
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type = types.lines;
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default = "";
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example = ''
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defaults.pcm.!card 3
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'';
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description = ''
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Set addition configuration for system-wide alsa.
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'';
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};
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mediaKeys = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable volume and capture control with keyboard media keys.
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Enabling this will turn on <option>services.actkbd</option>.
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'';
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};
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volumeStep = mkOption {
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type = types.string;
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default = "1";
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example = "1%";
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description = ''
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The value by which to increment/decrement volume on media keys.
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See amixer(1) for allowed values.
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'';
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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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environment.etc = mkIf (!pulseaudioEnabled && config.sound.extraConfig != "")
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[
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{ source = pkgs.writeText "asound.conf" config.sound.extraConfig;
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target = "asound.conf";
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}
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];
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# ALSA provides a udev rule for restoring volume settings.
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services.udev.packages = [ alsaUtils ];
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boot.kernelModules = optional config.sound.enableOSSEmulation "snd_pcm_oss";
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systemd.services."alsa-store" =
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{ description = "Store Sound Card State";
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wantedBy = [ "multi-user.target" ];
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unitConfig.RequiresMountsFor = "/var/lib/alsa";
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unitConfig.ConditionVirtualization = "!systemd-nspawn";
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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ExecStart = "${pkgs.coreutils}/bin/mkdir -p /var/lib/alsa";
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ExecStop = "${alsaUtils}/sbin/alsactl store --ignore";
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};
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};
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services.actkbd = mkIf config.sound.mediaKeys.enable {
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enable = true;
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bindings = [
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# "Mute" media key
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{ keys = [ 113 ]; events = [ "key" ]; command = "${alsaUtils}/bin/amixer -q set Master toggle"; }
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# "Lower Volume" media key
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{ keys = [ 114 ]; events = [ "key" "rep" ]; command = "${alsaUtils}/bin/amixer -q set Master ${config.sound.mediaKeys.volumeStep}- unmute"; }
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# "Raise Volume" media key
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{ keys = [ 115 ]; events = [ "key" "rep" ]; command = "${alsaUtils}/bin/amixer -q set Master ${config.sound.mediaKeys.volumeStep}+ unmute"; }
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# "Mic Mute" media key
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{ keys = [ 190 ]; events = [ "key" ]; command = "${alsaUtils}/bin/amixer -q set Capture toggle"; }
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];
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};
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};
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}
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