Adding lots of cool stuff to dotfiles

.config/wireplumber/scripts/policy-endpoint-device.lua

@@ -0,0 +1,234 @@
+-- WirePlumber
+--
+-- Copyright © 2021 Collabora Ltd.
+--    @author Julian Bouzas <julian.bouzas@collabora.com>
+--
+-- SPDX-License-Identifier: MIT
+
+-- Receive script arguments from config.lua
+local config = ... or {}
+
+-- ensure config.move and config.follow are not nil
+config.move = config.move or false
+config.follow = config.follow or false
+
+local self = {}
+self.scanning = false
+self.pending_rescan = false
+
+function rescan ()
+  -- check endpoints and register new links
+  for si_ep in endpoints_om:iterate() do
+    handleEndpoint (si_ep)
+  end
+end
+
+function scheduleRescan ()
+  if self.scanning then
+    self.pending_rescan = true
+    return
+  end
+
+  self.scanning = true
+  rescan ()
+  self.scanning = false
+
+  if self.pending_rescan then
+    self.pending_rescan = false
+    Core.sync(function ()
+      scheduleRescan ()
+    end)
+  end
+end
+
+function findTargetByDefaultNode (target_media_class)
+  local def_id = default_nodes:call("get-default-node", target_media_class)
+  if def_id ~= Id.INVALID then
+    for si_target in linkables_om:iterate() do
+      local target_node = si_target:get_associated_proxy ("node")
+      if target_node["bound-id"] == def_id then
+        return si_target
+      end
+    end
+  end
+  return nil
+end
+
+function findTargetByFirstAvailable (target_media_class)
+  for si_target in linkables_om:iterate() do
+    local target_node = si_target:get_associated_proxy ("node")
+    if target_node.properties["media.class"] == target_media_class then
+      return si_target
+    end
+  end
+  return nil
+end
+
+function findUndefinedTarget (si_ep)
+  local media_class = si_ep.properties["media.class"]
+  local target_class_assoc = {
+    ["Audio/Source"] = "Audio/Source",
+    ["Audio/Sink"] = "Audio/Sink",
+    ["Video/Source"] = "Video/Source",
+  }
+  local target_media_class = target_class_assoc[media_class]
+  if not target_media_class then
+    return nil
+  end
+
+  local si_target = findTargetByDefaultNode (target_media_class)
+  if not si_target then
+    si_target = findTargetByFirstAvailable (target_media_class)
+  end
+  return si_target
+end
+
+function createLink (si_ep, si_target)
+  local out_item = nil
+  local in_item = nil
+  local ep_props = si_ep.properties
+  local target_props = si_target.properties
+
+  if target_props["item.node.direction"] == "input" then
+    -- playback
+    out_item = si_ep
+    in_item = si_target
+  else
+    -- capture
+    in_item = si_ep
+    out_item = si_target
+  end
+
+  Log.info (string.format("link %s <-> %s",
+      ep_props["name"],
+      target_props["node.name"]))
+
+  -- create and configure link
+  local si_link = SessionItem ( "si-standard-link" )
+  if not si_link:configure {
+    ["out.item"] = out_item,
+    ["in.item"] = in_item,
+    ["out.item.port.context"] = "output",
+    ["in.item.port.context"] = "input",
+    ["passive"] = true,
+    ["is.policy.endpoint.device.link"] = true,
+  } then
+    Log.warning (si_link, "failed to configure si-standard-link")
+    return
+  end
+
+  -- register
+  si_link:register ()
+
+  -- activate
+  si_link:activate (Feature.SessionItem.ACTIVE, function (l, e)
+    if e then
+      Log.warning (l, "failed to activate si-standard-link: " .. tostring(e))
+      l:remove ()
+    else
+      Log.info (l, "activated si-standard-link")
+    end
+  end)
+end
+
+function handleEndpoint (si_ep)
+  Log.info (si_ep, "handling endpoint " .. si_ep.properties["name"])
+
+  -- find proper target item
+  local si_target = findUndefinedTarget (si_ep)
+  if not si_target then
+    Log.info (si_ep, "... target item not found")
+    return
+  end
+
+  -- Check if item is linked to proper target, otherwise re-link
+  for link in links_om:iterate() do
+    local out_id = tonumber(link.properties["out.item.id"])
+    local in_id = tonumber(link.properties["in.item.id"])
+    if out_id == si_ep.id or in_id == si_ep.id then
+      local is_out = out_id == si_ep.id and true or false
+      for peer in linkables_om:iterate() do
+        if peer.id == (is_out and in_id or out_id) then
+
+          if peer.id == si_target.id then
+            Log.info (si_ep, "... already linked to proper target")
+            return
+          end
+
+          -- remove old link if active, otherwise schedule rescan
+          if ((link:get_active_features() & Feature.SessionItem.ACTIVE) ~= 0) then
+            link:remove ()
+            Log.info (si_ep, "... moving to new target")
+          else
+            scheduleRescan ()
+            Log.info (si_ep, "... scheduled rescan")
+            return
+          end
+
+        end
+      end
+    end
+  end
+
+  -- create new link
+  createLink (si_ep, si_target)
+end
+
+function unhandleLinkable (si)
+  si_props = si.properties
+
+  Log.info (si, string.format("unhandling item: %s (%s)",
+      tostring(si_props["node.name"]), tostring(si_props["node.id"])))
+
+  -- remove any links associated with this item
+  for silink in links_om:iterate() do
+    local out_id = tonumber (silink.properties["out.item.id"])
+    local in_id = tonumber (silink.properties["in.item.id"])
+    if out_id == si.id or in_id == si.id then
+      silink:remove ()
+      Log.info (silink, "... link removed")
+    end
+  end
+end
+
+default_nodes = Plugin.find("default-nodes-api")
+endpoints_om = ObjectManager { Interest { type = "SiEndpoint" }}
+linkables_om = ObjectManager {
+  Interest {
+    type = "SiLinkable",
+    -- only handle device si-audio-adapter items
+    Constraint { "item.factory.name", "=", "si-audio-adapter", type = "pw-global" },
+    Constraint { "item.node.type", "=", "device", type = "pw-global" },
+    Constraint { "active-features", "!", 0, type = "gobject" },
+  }
+}
+links_om = ObjectManager {
+  Interest {
+    type = "SiLink",
+    -- only handle links created by this policy
+    Constraint { "is.policy.endpoint.device.link", "=", true, type = "pw-global" },
+  }
+}
+
+-- listen for default node changes if config.follow is enabled
+if config.follow then
+  default_nodes:connect("changed", function (p)
+    scheduleRescan ()
+  end)
+end
+
+linkables_om:connect("objects-changed", function (om)
+  scheduleRescan ()
+end)
+
+endpoints_om:connect("object-added", function (om)
+  scheduleRescan ()
+end)
+
+linkables_om:connect("object-removed", function (om, si)
+  unhandleLinkable (si)
+end)
+
+endpoints_om:activate()
+linkables_om:activate()
+links_om:activate()