152 lines
3.9 KiB
Nix
152 lines
3.9 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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ladspaPath = "${pkgs.ladspaPlugins}/lib/ladspa";
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jackScript = pkgs.writeShellScriptBin "jack" (lib.fileContents <assets/jack.sh>);
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queueElement = {
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options = {
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plugin = mkOption {
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type = with types; str;
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description = "file name without suffix of the plugin";
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};
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label = mkOption {
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type = with types; str;
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description = "label of the queue element (needs to be correct)";
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};
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control = mkOption {
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type = with types; listOf str;
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description = "parameter of plugin";
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};
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};
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};
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sinkElement = {
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options = {
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name = mkOption {
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type = with types; str;
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description = "name of the sink";
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};
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queue = mkOption {
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type = with types; listOf (submodule queueElement);
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description = "queues";
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};
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};
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};
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cfg = config.system.custom.audio;
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in {
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options.system.custom.audio = {
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enable = mkEnableOption "use PluseAudio";
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sinks = mkOption {
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type = with types; listOf (submodule sinkElement);
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description = "list of sinks";
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};
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};
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config = mkIf cfg.enable {
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# add virtual midi module
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# -----------------------
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boot = {
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# to route midi signals
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# between bitwig and vcvrack
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kernelModules = [ "snd_virmidi" ];
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# index=-2 prevents from beeing recognised as the default
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# audio device
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# midi_devs limit the number of midi devices.
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extraModprobeConfig = "options snd-virmidi index=-2 midi_devs=1";
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};
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# LADSPA
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# ------
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programs.bash.interactiveShellInit = /* sh */ ''
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# set ladspa library path
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# about testing the plugins check analyseplugin command
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export LADSPA_PATH=${ladspaPath}
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'';
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programs.zsh.interactiveShellInit = /* sh */ ''
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# set ladspa library path
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# about testing the plugins check analyseplugin command
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export LADSPA_PATH=${ladspaPath}
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'';
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# PulseAudio
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# ----------
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# because of systemWide ensure main user is in audio group
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system.custom.mainUser.extraGroups = [ "audio" ];
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hardware.pulseaudio = {
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enable = true;
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# all in audio group can do audio
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systemWide = true;
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package = pkgs.pulseaudioFull;
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extraConfig = ''
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# automatically switch to newly-connected devices
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load-module module-switch-on-connect
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# http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html
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# https://gavv.github.io/articles/pulseaudio-under-the-hood/#ladspa-plugin-sink
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${builtins.toString (flip map cfg.sinks (sink : ''
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# ladspa sink : ${sink.name}
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# -------------
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${builtins.toString (flip imap0 (reverseList sink.queue) (index : queua:
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let
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sinkName = suffix : "${sink.name}${builtins.toString suffix}";
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sinkValue = "sink_name=${sinkName index}";
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sinkDescription = "sink_properties=device.description=${sinkName index}-${queua.label}";
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masterValue = if (index == 0) then "" else "master=${sinkName (index - 1)}";
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pluginValue = "plugin=${ladspaPath}/${queua.plugin}";
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labelValue = "label=${queua.label}";
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controlValue = "control=${builtins.toString (foldl (a: b: "${a},${b}") (head queua.control) (tail queua.control))}";
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in ''
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# ${sinkName index} : ${queua.label}
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load-module module-ladspa-sink ${sinkValue} ${sinkDescription} ${masterValue} ${pluginValue} ${labelValue} ${controlValue}
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''))}
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''))}
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'';
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};
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# Packages needed
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# ---------------
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environment.systemPackages = with pkgs ; [
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jackScript
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# Music making
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jack2Full
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alsaUtils
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patchage
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zynaddsubfx
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# qjackctl
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# LADSPA
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# ------
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ladspaPlugins
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ladspa-sdk
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# PulseAudio control
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# ------------------
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pavucontrol
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lxqt.pavucontrol-qt
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];
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};
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}
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