PipeWire: Link Factory

PipeWire 1.4.9

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Link Factory

Allows clients to create links between ports.

This module creates a new factory. Clients that can see the factory can use the factory name (link-factory) to create new link objects with pw_core_create_object(). It is also possible to create objects in the config file.

Object of the PW_TYPE_INTERFACE_Link will be created and a proxy to it will be returned.

As an argument to the create_object call, a set of properties will control what ports will be linked.

# Module Name

libpipewire-module-link-factory

# Module Options

- allow.link.passive: if the link.passive property is allowed. Default false. By default, the core will decide when a link is passive based on the properties of the node and ports.

# Properties for the create_object call

- link.output.node: The output node to use. This can be the node object.id, node.name, node.nick, node.description or object.path of a node. When the property is not given or NULL, the output port should be specified.
- link.output.port: The output port to link. This can be a port object.id, port.name, port.alias or object.path. If an output node is specified, the port must belong to the node. Finding a port in a node using the port.id is deprecated and may lead to unexpected results when the port.id also matches an object.id. If no output port is given, an output node must be specified and a random (unlinked) port will be used from the node.
- link.input.node: The input node to use. This can be the node object.id, node.name, node.nick, node.description or object.path of a node. When the property is not given or NULL, the input port should be specified.
- link.input.port: The input port to link. This can be a port object.id, port.name, port.alias or object.path. If an input node is specified, the port must belong to the node. Finding a port in a node using the port.id is deprecated and may lead to unexpected results when the port.id also matches an object.id. If no input port is given, an input node must be specified and a random (unlinked) port will be used from the node.
- object.linger: Keep the link around even when the client that created it is gone.
- link.passive: The link is passive, meaning that it will not keep nodes busy. By default this property is ignored and the node and port properties are used to determine the passive state of the link.

# Example configuration

The module is usually added to the config file of the main pipewire daemon.

context.modules = [
{ name = libpipewire-link-factory
args = {
#allow.link.passive = false
}
}
]

# Config override

A module.link-factory.args config section can be added to override the module arguments.

# ~/.config/pipewire/pipewire.conf.d/my-link-factory-args.conf
module.link-factory.args = {
#allow.link.passive = false
}

# Config objects

To create an object from the factory, one can use the pw_core_create_object() method or make an object in the context.objects section like:

context.objects = [
{ factory = link-factory
args = {
link.output.node = system
link.output.port = capture_2
link.input.node = my-mic
link.input.port = input_FR
}
}

Note that this only works when the ports that need to be linked are available at the time the config file is parsed.

# See also

- pw-link: a tool to manage port links