Update

pipewire/.config/wireplumber/scripts/node/create-item.lua

@@ -0,0 +1,154 @@
+-- WirePlumber
+--
+-- Copyright © 2021 Collabora Ltd.
+--    @author Julian Bouzas <julian.bouzas@collabora.com>
+--
+-- SPDX-License-Identifier: MIT
+
+-- create-item.lua script takes pipewire nodes and creates session items (a.k.a
+-- linkable) objects out of them.
+
+cutils = require ("common-utils")
+log = Log.open_topic ("s-node")
+
+items = {}
+
+function configProperties (node)
+  local properties = node.properties
+  local media_class = properties ["media.class"] or ""
+
+  -- ensure a media.type is set
+  if not properties ["media.type"] then
+    for _, i in ipairs ({ "Audio", "Video", "Midi" }) do
+      if media_class:find (i) then
+        properties ["media.type"] = i
+        break
+      end
+    end
+  end
+
+  properties ["item.node"] = node
+  properties ["item.node.direction"] =
+      cutils.mediaClassToDirection (media_class)
+  properties ["item.node.type"] =
+      media_class:find ("^Stream/") and "stream" or "device"
+  properties ["item.plugged.usec"] = GLib.get_monotonic_time ()
+  properties ["item.features.no-dsp"] =
+      Settings.get_boolean ("node.features.audio.no-dsp")
+  properties ["item.features.monitor"] =
+      Settings.get_boolean ("node.features.audio.monitor-ports")
+  properties ["item.features.control-port"] =
+      Settings.get_boolean ("node.features.audio.control-port")
+  properties ["node.id"] = node ["bound-id"]
+
+  -- set the default media.role, if configured
+  -- avoid Settings.get_string(), as it will parse the default "null" value
+  -- as a string instead of returning nil
+  local default_role = Settings.get ("node.stream.default-media-role")
+  if default_role then
+    default_role = default_role:parse()
+    properties ["media.role"] = properties ["media.role"] or default_role
+  end
+
+  return properties
+end
+
+AsyncEventHook {
+  name = "node/create-item",
+  interests = {
+    EventInterest {
+      Constraint { "event.type", "=", "node-added" },
+      Constraint { "media.class", "#", "Stream/*", type = "pw-global" },
+    },
+    EventInterest {
+      Constraint { "event.type", "=", "node-added" },
+      Constraint { "media.class", "#", "Video/*", type = "pw-global" },
+    },
+    EventInterest {
+      Constraint { "event.type", "=", "node-added" },
+      Constraint { "media.class", "#", "Audio/*", type = "pw-global" },
+      Constraint { "wireplumber.is-virtual", "-", type = "pw" },
+    },
+  },
+  steps = {
+    start = {
+      next = "register",
+      execute = function (event, transition)
+        local node = event:get_subject ()
+        local id = node.id
+        local item
+        local item_type
+
+        local media_class = node.properties ['media.class']
+        if string.find (media_class, "Audio") then
+          item_type = "si-audio-adapter"
+        else
+          item_type = "si-node"
+        end
+
+        log:info (node, "creating item for node -> " .. item_type)
+
+        -- create item
+        item = SessionItem (item_type)
+        items [id] = item
+
+        -- configure item
+        if not item:configure (configProperties (node)) then
+          transition:return_error ("failed to configure item for node "
+              .. tostring (id))
+          return
+        end
+
+        -- activate item
+        item:activate (Features.ALL, function (_, e)
+          if e then
+            transition:return_error ("failed to activate item: "
+                .. tostring (e));
+          else
+            transition:advance ()
+          end
+        end)
+      end,
+    },
+    register = {
+      next = "none",
+      execute = function (event, transition)
+        local node = event:get_subject ()
+        local bound_id = node ["bound-id"]
+        local item = items [node.id]
+
+        log:info (item, "activated item for node " .. tostring (bound_id))
+        item:register ()
+        transition:advance ()
+      end,
+    },
+  },
+}:register ()
+
+SimpleEventHook {
+  name = "node/destroy-item",
+  interests = {
+    EventInterest {
+      Constraint { "event.type", "=", "node-removed" },
+      Constraint { "media.class", "#", "Stream/*", type = "pw-global" },
+    },
+    EventInterest {
+      Constraint { "event.type", "=", "node-removed" },
+      Constraint { "media.class", "#", "Video/*", type = "pw-global" },
+    },
+    EventInterest {
+      Constraint { "event.type", "=", "node-removed" },
+      Constraint { "media.class", "#", "Audio/*", type = "pw-global" },
+      Constraint { "wireplumber.is-virtual", "-", type = "pw" },
+    },
+  },
+  execute = function (event)
+    local node = event:get_subject ()
+    local id = node.id
+    if items [id] then
+      items [id]:remove ()
+      items [id] = nil
+    end
+
+  end
+}:register ()