WirePlumber script to automatically attach a filter to a device
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#!/usr/bin/wpexec | |
local mic_name = "alsa_input.usb-C-Media_Electronics_Inc._USB_Audio_Device-00.mono-fallback" | |
local filter_name = "rnnoise_source" | |
local link_props = { | |
["link.output.port"] = nil, | |
["link.input.port"] = nil, | |
["link.output.node"] = nil, | |
["link.input.node"] = nil | |
} | |
local link = nil | |
mic_om = ObjectManager { | |
Interest { | |
type = "node", | |
Constraint { | |
"node.name", "=", mic_name | |
} | |
} | |
} | |
mic_port_om = ObjectManager { | |
Interest { | |
type = "port", | |
Constraint { | |
"port.direction", "=", "out" | |
} | |
} | |
} | |
filter_om = ObjectManager { | |
Interest { | |
type = "node", | |
Constraint { | |
"node.name", "=", filter_name | |
} | |
} | |
} | |
filter_port_om = ObjectManager { | |
Interest { | |
type = "port", | |
Constraint { | |
"port.direction", "=", "in" | |
} | |
} | |
} | |
link_om = ObjectManager { | |
Interest { | |
type = "link" | |
} | |
} | |
function find_port(node_id, port_om) | |
for port in port_om:iterate() do | |
if port.properties["node.id"] == node_id then | |
return port.properties["object.id"] | |
end | |
end | |
end | |
function add_node(node, direction, port_om) | |
local props = node.properties | |
local object_id = props["object.id"] | |
link_props["link." .. direction .. ".node"] = object_id | |
if link_props["link." .. direction .. ".port"] == nil then | |
link_props["link." .. direction .. ".port"] = find_port(object_id, port_om) | |
end | |
end | |
function try_activate_link() | |
if link ~= nil then | |
print("Link is active") | |
return | |
end | |
local count = 0 | |
for k,v in pairs(link_props) do | |
count = count + 1 | |
end | |
if count ~= 4 then | |
print("Not all properties are set") | |
return | |
end | |
print("Setup link") | |
for l in link_om:iterate {Constraint {"link.input.node","=", link_props["link.input.node"]}} do | |
print("Removed link that were attached to filter") | |
l:request_destroy() | |
end | |
link = Link("link-factory", link_props) | |
link:activate(1) | |
end | |
function deactivate_link() | |
if link == nil then | |
return | |
end | |
link:request_destroy() | |
link = nil | |
link_props["link.output.port"] = nil | |
link_props["link.output.node"] = nil | |
end | |
function add_port(port, direction) | |
if link_props["link." .. direction .. ".node"] == port.properties["node.id"] then | |
link_props["link." .. direction .. ".port"] = port.properties["object.id"] | |
end | |
end | |
mic_port_om:connect("object-added", function(om, port) | |
add_port(port, "output") | |
try_activate_link() | |
end) | |
filter_port_om:connect("object-added", function(om, port) | |
add_port(port, "input") | |
try_activate_link() | |
end) | |
filter_om:connect("object-added", function(om, node) | |
add_node(node, "input", filter_port_om) | |
try_activate_link() | |
end) | |
mic_om:connect("object-added", function(om, node) | |
add_node(node, "output", mic_port_om) | |
try_activate_link() | |
end) | |
mic_om:connect("object-removed", function (om, node) | |
deactivate_link() | |
end) | |
link_om:connect("object-removed", function (om, l) | |
if l == link then | |
print("Link was removed") | |
link = nil | |
print("Try to add the link again") | |
try_activate_link() | |
end | |
end) | |
mic_om:activate() | |
filter_om:activate() | |
link_om:activate() | |
mic_port_om:activate() | |
filter_port_om:activate() |
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