Adding lots of cool stuff to dotfiles

.config/wireplumber/scripts/fallback-sink.lua

@@ -0,0 +1,93 @@
+-- WirePlumber
+--
+-- Copyright © 2021 Collabora Ltd.
+--    @author Frédéric Danis <frederic.danis@collabora.com>
+--
+-- SPDX-License-Identifier: MIT
+
+local sink_ids = {}
+local fallback_node = nil
+
+node_om = ObjectManager {
+  Interest {
+    type = "node",
+    Constraint { "media.class", "matches", "Audio/Sink", type = "pw-global" },
+    -- Do not consider endpoints created by WirePlumber
+    Constraint { "wireplumber.is-endpoint", "!", true, type = "pw" },
+    -- or the fallback sink itself
+    Constraint { "wireplumber.is-fallback", "!", true, type = "pw" },
+  }
+}
+
+function createFallbackSink()
+  if fallback_node then
+    return
+  end
+
+  Log.info("Create fallback sink")
+
+  local properties = {}
+
+  properties["node.name"] = "auto_null"
+  properties["node.description"] = "Dummy Output"
+
+  properties["audio.rate"] = 48000
+  properties["audio.channels"] = 2
+  properties["audio.position"] = "FL,FR"
+
+  properties["media.class"] = "Audio/Sink"
+  properties["factory.name"] = "support.null-audio-sink"
+  properties["node.virtual"] = "true"
+  properties["monitor.channel-volumes"] = "true"
+
+  properties["wireplumber.is-fallback"] = "true"
+  properties["priority.session"] = 500
+
+  fallback_node = LocalNode("adapter", properties)
+  fallback_node:activate(Feature.Proxy.BOUND)
+end
+
+function checkSinks()
+  local sink_ids_items = 0
+  for _ in pairs(sink_ids) do sink_ids_items = sink_ids_items + 1 end
+
+  if sink_ids_items > 0 then
+    if fallback_node then
+      Log.info("Remove fallback sink")
+      fallback_node = nil
+    end
+  elseif not fallback_node then
+    createFallbackSink()
+  end
+end
+
+function checkSinksAfterTimeout()
+  if timeout_source then
+    timeout_source:destroy()
+  end
+  timeout_source = Core.timeout_add(1000, function ()
+    checkSinks()
+    timeout_source = nil
+  end)
+end
+
+node_om:connect("object-added", function (_, node)
+  Log.debug("object added: " .. node.properties["object.id"] .. " " ..
+      tostring(node.properties["node.name"]))
+
+  sink_ids[node.properties["object.id"]] = node.properties["node.name"]
+
+  checkSinksAfterTimeout()
+end)
+
+node_om:connect("object-removed", function (_, node)
+  Log.debug("object removed: " .. node.properties["object.id"] .. " " ..
+      tostring(node.properties["node.name"]))
+
+  sink_ids[node.properties["object.id"]] = nil
+  checkSinksAfterTimeout()
+end)
+
+node_om:activate()
+
+checkSinksAfterTimeout()