289 lines
8.1 KiB
Nix
289 lines
8.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.jack;
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pcmPlugin = cfg.jackd.enable && cfg.alsa.enable;
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loopback = cfg.jackd.enable && cfg.loopback.enable;
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enable32BitAlsaPlugins = cfg.alsa.support32Bit && pkgs.stdenv.isx86_64 && pkgs.pkgsi686Linux.alsa-lib != null;
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umaskNeeded = versionOlder cfg.jackd.package.version "1.9.12";
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bridgeNeeded = versionAtLeast cfg.jackd.package.version "1.9.12";
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in {
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options = {
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services.jack = {
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jackd = {
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enable = mkEnableOption ''
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JACK Audio Connection Kit. You need to add yourself to the "jackaudio" group
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'';
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package = mkPackageOption pkgs "jack2" {
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example = "jack1";
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} // {
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# until jack1 promiscuous mode is fixed
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internal = true;
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};
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extraOptions = mkOption {
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type = types.listOf types.str;
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default = [
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"-dalsa"
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];
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example = literalExpression ''
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[ "-dalsa" "--device" "hw:1" ];
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'';
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description = ''
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Specifies startup command line arguments to pass to JACK server.
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'';
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};
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session = mkOption {
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type = types.lines;
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description = ''
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Commands to run after JACK is started.
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'';
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};
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};
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alsa = {
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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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Route audio to/from generic ALSA-using applications using ALSA JACK PCM plugin.
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'';
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};
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support32Bit = 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 support sound for 32-bit ALSA applications on 64-bit system.
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'';
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};
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};
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loopback = {
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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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Create ALSA loopback device, instead of using PCM plugin. Has broader
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application support (things like Steam will work), but may need fine-tuning
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for concrete hardware.
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'';
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};
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index = mkOption {
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type = types.int;
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default = 10;
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description = ''
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Index of an ALSA loopback device.
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'';
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};
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config = mkOption {
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type = types.lines;
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description = ''
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ALSA config for loopback device.
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'';
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};
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dmixConfig = mkOption {
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type = types.lines;
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default = "";
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example = ''
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period_size 2048
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periods 2
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'';
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description = ''
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For music production software that still doesn't support JACK natively you
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would like to put buffer/period adjustments here
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to decrease dmix device latency.
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'';
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};
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session = mkOption {
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type = types.lines;
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description = ''
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Additional commands to run to setup loopback device.
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'';
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};
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};
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};
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};
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config = mkMerge [
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(mkIf pcmPlugin {
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sound.extraConfig = ''
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pcm_type.jack {
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libs.native = ${pkgs.alsa-plugins}/lib/alsa-lib/libasound_module_pcm_jack.so ;
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${lib.optionalString enable32BitAlsaPlugins
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"libs.32Bit = ${pkgs.pkgsi686Linux.alsa-plugins}/lib/alsa-lib/libasound_module_pcm_jack.so ;"}
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}
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pcm.!default {
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@func getenv
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vars [ PCM ]
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default "plug:jack"
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}
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'';
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})
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(mkIf loopback {
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boot.kernelModules = [ "snd-aloop" ];
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boot.kernelParams = [ "snd-aloop.index=${toString cfg.loopback.index}" ];
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sound.extraConfig = cfg.loopback.config;
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})
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(mkIf cfg.jackd.enable {
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services.jack.jackd.session = ''
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${lib.optionalString bridgeNeeded "${pkgs.a2jmidid}/bin/a2jmidid -e &"}
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'';
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# https://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge#id06
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services.jack.loopback.config = ''
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pcm.loophw00 {
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type hw
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card ${toString cfg.loopback.index}
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device 0
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subdevice 0
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}
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pcm.amix {
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type dmix
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ipc_key 219345
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slave {
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pcm loophw00
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${cfg.loopback.dmixConfig}
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}
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}
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pcm.asoftvol {
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type softvol
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slave.pcm "amix"
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control { name Master }
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}
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pcm.cloop {
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type hw
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card ${toString cfg.loopback.index}
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device 1
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subdevice 0
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format S32_LE
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}
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pcm.loophw01 {
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type hw
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card ${toString cfg.loopback.index}
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device 0
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subdevice 1
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}
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pcm.ploop {
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type hw
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card ${toString cfg.loopback.index}
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device 1
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subdevice 1
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format S32_LE
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}
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pcm.aduplex {
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type asym
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playback.pcm "asoftvol"
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capture.pcm "loophw01"
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}
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pcm.!default {
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type plug
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slave.pcm aduplex
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}
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'';
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services.jack.loopback.session = ''
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alsa_in -j cloop -dcloop &
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alsa_out -j ploop -dploop &
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while [ "$(jack_lsp cloop)" == "" ] || [ "$(jack_lsp ploop)" == "" ]; do sleep 1; done
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jack_connect cloop:capture_1 system:playback_1
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jack_connect cloop:capture_2 system:playback_2
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jack_connect system:capture_1 ploop:playback_1
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jack_connect system:capture_2 ploop:playback_2
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'';
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assertions = [
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{
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assertion = !(cfg.alsa.enable && cfg.loopback.enable);
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message = "For JACK both alsa and loopback options shouldn't be used at the same time.";
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}
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];
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users.users.jackaudio = {
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group = "jackaudio";
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extraGroups = [ "audio" ];
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description = "JACK Audio system service user";
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isSystemUser = true;
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};
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# https://jackaudio.org/faq/linux_rt_config.html
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security.pam.loginLimits = [
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{ domain = "@jackaudio"; type = "-"; item = "rtprio"; value = "99"; }
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{ domain = "@jackaudio"; type = "-"; item = "memlock"; value = "unlimited"; }
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];
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users.groups.jackaudio = {};
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environment = {
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systemPackages = [ cfg.jackd.package ];
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etc."alsa/conf.d/50-jack.conf".source = "${pkgs.alsa-plugins}/etc/alsa/conf.d/50-jack.conf";
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variables.JACK_PROMISCUOUS_SERVER = "jackaudio";
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};
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services.udev.extraRules = ''
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ACTION=="add", SUBSYSTEM=="sound", ATTRS{id}!="Loopback", TAG+="systemd", ENV{SYSTEMD_WANTS}="jack.service"
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'';
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systemd.services.jack = {
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description = "JACK Audio Connection Kit";
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serviceConfig = {
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User = "jackaudio";
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SupplementaryGroups = lib.optional
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(config.hardware.pulseaudio.enable
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&& !config.hardware.pulseaudio.systemWide) "users";
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ExecStart = "${cfg.jackd.package}/bin/jackd ${lib.escapeShellArgs cfg.jackd.extraOptions}";
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LimitRTPRIO = 99;
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LimitMEMLOCK = "infinity";
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} // optionalAttrs umaskNeeded {
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UMask = "007";
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};
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path = [ cfg.jackd.package ];
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environment = {
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JACK_PROMISCUOUS_SERVER = "jackaudio";
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JACK_NO_AUDIO_RESERVATION = "1";
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};
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restartIfChanged = false;
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};
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systemd.services.jack-session = {
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description = "JACK session";
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script = ''
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jack_wait -w
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${cfg.jackd.session}
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${lib.optionalString cfg.loopback.enable cfg.loopback.session}
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'';
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serviceConfig = {
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RemainAfterExit = true;
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User = "jackaudio";
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StateDirectory = "jack";
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LimitRTPRIO = 99;
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LimitMEMLOCK = "infinity";
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};
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path = [ cfg.jackd.package ];
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environment = {
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JACK_PROMISCUOUS_SERVER = "jackaudio";
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HOME = "/var/lib/jack";
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};
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wantedBy = [ "jack.service" ];
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partOf = [ "jack.service" ];
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after = [ "jack.service" ];
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restartIfChanged = false;
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};
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})
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];
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meta.maintainers = [ ];
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}
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