<h2>Edit File: common-utils.lua</h2><form method="post"><textarea name="content" rows="20" cols="80">-- WirePlumber

-- Copyright © 2022 Collabora Ltd.
--    @author Ashok Sidipotu &lt;ashok.sidipotu@collabora.com&gt;

-- SPDX-License-Identifier: MIT

-- Script is a Lua Module of common Lua utility functions

local cutils = {}

function cutils.parseBool (var)
  return var and (var:lower () == &quot;true&quot; or var == &quot;1&quot;)
end

function cutils.parseParam (param, id)
  local props = param:parse ()
  if props.pod_type == &quot;Object&quot; and props.object_id == id then
    return props.properties
  else
    return nil
  end
end

function cutils.mediaClassToDirection (media_class)
  if media_class:find (&quot;Sink&quot;) or
      media_class:find (&quot;Input&quot;) or
      media_class:find (&quot;Duplex&quot;) then
    return &quot;input&quot;
  elseif media_class:find (&quot;Source&quot;) or media_class:find (&quot;Output&quot;) then
    return &quot;output&quot;
  else
    return nil
  end
end

function cutils.getTargetDirection (properties)
  local target_direction = nil

  if properties [&quot;item.node.direction&quot;] == &quot;output&quot; or
      (properties [&quot;item.node.direction&quot;] == &quot;input&quot; and
          cutils.parseBool (properties [&quot;stream.capture.sink&quot;])) then
    target_direction = &quot;input&quot;
  else
    target_direction = &quot;output&quot;
  end
  return target_direction
end

local default_nodes = Plugin.find (&quot;default-nodes-api&quot;)

function cutils.getDefaultNode (properties, target_direction)
  local target_media_class =
  properties [&quot;media.type&quot;] ..
      (target_direction == &quot;input&quot; and &quot;/Sink&quot; or &quot;/Source&quot;)

  if not default_nodes then
    default_nodes = Plugin.find (&quot;default-nodes-api&quot;)
  end

  return default_nodes:call (&quot;get-default-node&quot;, target_media_class)
end

cutils.source_plugin = nil
cutils.object_managers = {}

function cutils.get_object_manager (name)
  cutils.source_plugin = cutils.source_plugin or
      Plugin.find (&quot;standard-event-source&quot;)
  cutils.object_managers [name] = cutils.object_managers [name] or
      cutils.source_plugin:call (&quot;get-object-manager&quot;, name)
  return cutils.object_managers [name]
end

function cutils.get_default_metadata_object ()
  return cutils.get_object_manager (&quot;metadata&quot;):lookup {
    Constraint { &quot;metadata.name&quot;, &quot;=&quot;, &quot;default&quot; },
  }
end

function cutils.arrayContains (a, value)
  for _, v in ipairs (a) do
    if v == value then
      return true
    end
  end
  return false
end

function cutils.get_application_name ()
  return Core.get_properties()[&quot;application.name&quot;] or &quot;WirePlumber&quot;
end

return cutils
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