Add wireplumber config

Author: baerchen201

linux/connect-virtual-mic.lua

@@ -0,0 +1,123 @@
+-- As explained on: https://bennett.dev/auto-link-pipewire-ports-wireplumber/
+--
+-- This script keeps my stereo-null-sink connected to whatever output I'm currently using.
+-- I do this so Pulseaudio (and Wine) always sees a stereo output plus I can swap the output
+-- without needing to reconnect everything.
+
+-- Link two ports together
+function link_port(output_port, input_port)
+  if not input_port or not output_port then
+    return nil
+  end
+
+  local link_args = {
+    ["link.input.node"] = input_port.properties["node.id"],
+    ["link.input.port"] = input_port.properties["object.id"],
+
+    ["link.output.node"] = output_port.properties["node.id"],
+    ["link.output.port"] = output_port.properties["object.id"],
+    
+    -- The node never got created if it didn't have this field set to something
+    ["object.id"] = nil,
+
+    -- I was running into issues when I didn't have this set
+    ["object.linger"] = true,
+
+    ["node.description"] = "Link created by auto_connect_ports"
+  }
+
+  local link = Link("link-factory", link_args)
+  link:activate(1)
+
+  return link
+end
+
+-- Automatically link ports together by their specific audio channels.
+--
+-- ┌──────────────────┐         ┌───────────────────┐
+-- │                  │         │                   │
+-- │               FL ├────────►│ AUX0              │
+-- │      SOURCE      │         │                   │
+-- │               FR ├────────►│ AUX1   SINK       │
+-- │                  │         │                   │
+-- └──────────────────┘         │ AUX2              │
+--                              │                   │
+--                              └───────────────────┘
+-- 
+-- -- Call this method inside a script in global scope
+--
+-- auto_connect_ports {
+--
+--   -- A constraint for all the required ports of the output device 
+--   source = Constraint { .. }
+--
+--   -- A constraint for all the required ports of the input device 
+--   sink = Constraint { .. }
+--
+--   -- A mapping of output audio channels to input audio channels
+--
+--   connections = {
+--     FL = "AUX0"
+--     FR = "AUX1"
+--   }
+--
+-- }
+--
+function auto_connect_ports(args)
+  local source_om = ObjectManager {
+    Interest {
+      type = "port",
+      args["source"],
+    }
+  }
+
+  local sink_om = ObjectManager {
+    Interest {
+      type = "port",
+      args["sink"],
+    }
+  }
+
+  local all_links = ObjectManager {
+    Interest {
+      type = "link",
+    }
+  }
+
+  function _connect()
+    print("_connect")
+    for source_name, sink_name in pairs(args.connect) do
+      print(source_name, sink_name)
+      for source in source_om:iterate { Constraint { "port.name", "equals", source_name } } do
+	print(source)
+       	for sink in sink_om:iterate { Constraint { "audio.channel", "equals", sink_name } } do
+	  print(sink)
+          local link = link_port(source, sink)
+ 	  if link then
+            print("link")
+    	  else
+	    print("no link")
+    	  end
+        end
+      end
+    end
+  end
+
+  source_om:connect("object-added", _connect)
+  sink_om:connect("object-added", _connect)
+  all_links:connect("object-added", _connect)
+
+  source_om:activate()
+  sink_om:activate()
+  all_links:activate()
+end
+
+auto_connect_ports {
+  source = Constraint { "object.path", "matches", "virtual_in:*" },
+  sink = Constraint { "port.alias", "matches", "ALC671 Analog:*" },
+  connect = {
+    monitor_FL = "FL",
+    monitor_FR = "FR"
+  }
+}
+