camera-monitors: add a config property for camera discovery timeout

src/config/wireplumber.conf.d/device.conf

@@ -23,4 +23,7 @@ wireplumber.settings = {
 
   ## Sets the default echo-cancel-source node name to automatically switch to
   # device.echo-cancel-source-name = "echo-cancel-source"
+
+  ## The device discovery time out(in milli sec) between V4L2 and libcamera.
+  # device.camera-discovery-timeout = 100
 }

src/scripts/lib/device-config.lua

@@ -15,6 +15,7 @@ local defaults = {
   ["auto-echo-cancel"] = true,
   ["echo-cancel-sink-name"] = "echo-cancel-sink",
   ["echo-cancel-source-name"] = "echo-cancel-source",
+  ["camera-discovery-timeout"] = 100,
 }
 
 return settings_manager.new ("device.", defaults)

src/scripts/lib/monitor-utils.lua

@@ -7,7 +7,9 @@
 
 -- Script is a Lua Module of monitor Lua utility functions
 
+config = require ("device-config")
 log = Log.open_topic ("s-monitors-utils")
+d_timeout = config["camera-discovery-timeout"]
 
 local mutils = {
   cam_data = {}
@@ -102,7 +104,7 @@ function mutils.register_cam_node (self, parent, id, factory, properties)
   local other_api = api == "v4l2" and "libcamera" or "v4l2"
   if cam_api_data.enum_status and not cam_data[other_api].enum_status then
     log:trace (string.format ("\"%s\" armed a timer for %d", api, dev_num))
-    cam_data.source = Core.timeout_add (100, function()
+    cam_data.source = Core.timeout_add (d_timeout, function()
       log:trace (string.format ("\"%s\" armed timer expired for %d", api, dev_num))
       self:create_cam_node (dev_num)
       cam_data.source = nil