<h2>Edit File: software-dsp.lua</h2><form method="post"><textarea name="content" rows="20" cols="80">-- WirePlumber
--
-- Copyright © 2022-2023 The WirePlumber project contributors
--    @author Dmitry Sharshakov &lt;d3dx12.xx@gmail.com&gt;
--
-- SPDX-License-Identifier: MIT

log = Log.open_topic(&quot;s-node&quot;)

config = {}
config.rules = Conf.get_section_as_json(&quot;node.software-dsp.rules&quot;, Json.Array{})

-- TODO: port from Obj Manager to Hooks
clients_om = ObjectManager {
  Interest { type = &quot;client&quot; }
}

filter_nodes = {}
hidden_nodes = {}

SimpleEventHook {
  name = &quot;node/dsp/create-dsp-node&quot;,
  interests = {
    EventInterest {
      Constraint  { &quot;event.type&quot;, &quot;=&quot;, &quot;node-added&quot; },
    },
  },
  execute = function(event)
    local node = event:get_subject()
    JsonUtils.match_rules (config.rules, node.properties, function (action, value)
      if action == &quot;create-filter&quot; then
        local props = value:parse (1)
        log:debug(&quot;DSP rule found for &quot; .. node.properties[&quot;node.name&quot;])

        if props[&quot;filter-graph&quot;] then
          log:debug(&quot;Loading filter graph for &quot; .. node.properties[&quot;node.name&quot;])
          filter_nodes[node.id] = LocalModule(&quot;libpipewire-module-filter-chain&quot;, props[&quot;filter-graph&quot;], {})
        elseif props[&quot;filter-path&quot;] then
          log:debug(&quot;Loading filter graph for &quot; .. node.properties[&quot;node.name&quot;] .. &quot; from disk&quot;)
          local conf = Conf(props[&quot;filter-path&quot;], {
            [&quot;as-section&quot;] = &quot;node.software-dsp.graph&quot;,
            [&quot;no-fragments&quot;] = true
          })
          local err = conf:open()
          if not err then
            local args = conf:get_section_as_json(&quot;node.software-dsp.graph&quot;):to_string()
            filter_nodes[node.id] = LocalModule(&quot;libpipewire-module-filter-chain&quot;, args, {})
          else
            log:warning(&quot;Unable to load filter graph for &quot; .. node.properties[&quot;node.name&quot;])
          end
        end

        if props[&quot;hide-parent&quot;] then
          log:debug(&quot;Setting permissions to &#039;-&#039; on &quot; .. node.properties[&quot;node.name&quot;] .. &quot; for open clients&quot;)
          for client in clients_om:iterate{ type = &quot;client&quot; } do
            if not client[&quot;properties&quot;][&quot;wireplumber.daemon&quot;] then
              client:update_permissions{ [node[&quot;bound-id&quot;]] = &quot;-&quot; }
            end
          end
          hidden_nodes[node[&quot;bound-id&quot;]] = node.id
        end
      end
    end)
  end
}:register()

SimpleEventHook {
  name = &quot;node/dsp/free-dsp-node&quot;,
  interests = {
    EventInterest {
      Constraint  { &quot;event.type&quot;, &quot;=&quot;, &quot;node-removed&quot; },
    },
  },
  execute = function(event)
    local node = event:get_subject()
    if filter_nodes[node.id] then
      log:debug(&quot;Freeing filter on node &quot; .. node.id)
      filter_nodes[node.id] = nil
      hidden_nodes[node[&quot;bound-id&quot;]] = nil
    end
  end
}:register()

clients_om:connect(&quot;object-added&quot;, function (om, client)
  for id, _ in pairs(hidden_nodes) do
    if not client[&quot;properties&quot;][&quot;wireplumber.daemon&quot;] then
      client:update_permissions { [id] = &quot;-&quot; }
    end
  end
end)

clients_om:activate()
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