# Well-known features

This is a list of some well-known features that can be enabled or disabled accordingly.

There are many more features actually defined in the configuration file, and it can be confusing to go through them. This list here is meant to be a quick reference for the most common ones that actually make sense to be toggled in a configuration file in order to customize WirePlumber's behavior.

For more information on what features are and how they work, refer to the previous section: Components & Profiles.

## Hardware monitors

### Audio

hardware.audio

  Enables bringing up audio hardware.

  Wants:

    `monitor.alsa`, `monitor.alsa-midi`

monitor.alsa

  Enables the ALSA device monitor.

  Wants:

    `monitor.alsa.reserve-device`

monitor.alsa.reserve-device

  Enables D-Bus device reservation API for ALSA devices.

  Requires:

    `support.reserve-device`

monitor.alsa-midi

  Enables the ALSA MIDI device monitor.

node.software-dsp

  Enables software DSP based on pre-configured hardware rules.

  See Automatic Software DSP for more information.

### Bluetooth

hardware.bluetooth

  Enables bringing up bluetooth hardware.

  Wants:

    `monitor.bluez`, `monitor.bluez-midi`

monitor.bluez

  Enables the BlueZ device monitor.

  Wants:

    `monitor.bluez.seat-monitoring`

monitor.bluez.seat-monitoring

  Enables seat monitoring on the bluetooth monitor.

  When enabled, this will make sure that the bluetooth devices are only enabled on the active seat.

  Requires:

    `support.logind`

monitor.bluez-midi

  Enables the BlueZ MIDI device monitor.

  Wants:

    `monitor.bluez.seat-monitoring`

### Video

hardware.video-capture

  Enables bringing up video capture hardware (cameras, hdmi capture devices, etc.)

  Wants:

    `monitor.v4l2`, `monitor.libcamera`

monitor.v4l2

  Enables the V4L2 device monitor.

monitor.libcamera

  Enables the libcamera device monitor.

## Support components

support.dbus

  Provides a D-Bus connection to the session bus. This is needed by some other support features (see below) but it is generally optional. WirePlumber does not require a D-Bus connection to work.

  On a system where WirePlumber is configured to run system-wide (headless, embedded, etc), this will most likely fail to load and thus disable all the other support features that require it. On such systems it makes sense to disable this feature explicitly, to avoid the overhead of trying to connect to the session bus.

support.reserve-device

  Provides support for the D-Bus device reservation API, allowing the device monitors to reserve devices for exclusive access.

  Requires:

    `support.dbus`

support.portal-permissionstore

  Integrates with the flatpak portal permission store to give appropriate access permissions to flatpak applications.

  Requires:

    `support.dbus`

support.logind

  Integrates with systemd-logind to enable specific functionality only on the active seat.

## Policies

policy.standard

  Enables the standard WirePlumber policy. This includes all the logic for enabling devices, linking streams, granting permissions to clients, etc, as appropriate for a desktop system.

policy.role-based

  Enables the role based priority system policy. This system creates virtual sinks that group streams based on their `media.role` property, and assigns a priority to each role. Depending on the priority configuration, lower priority roles may be corked or ducked when a higher priority role stream is active.

  This policy was designed for automotive and mobile systems and may not work as expected on desktop systems.

  Note that this policy is implemented as a superset of `policy.standard`, so `policy.standard` should not be disabled when enabling this policy.

  Requires:

    `policy.standard`