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- # This file is part of PulseAudio.
- #
- # PulseAudio is free software; you can redistribute it and/or modify
- # it under the terms of the GNU Lesser General Public License as
- # published by the Free Software Foundation; either version 2.1 of the
- # License, or (at your option) any later version.
- #
- # PulseAudio is distributed in the hope that it will be useful, but
- # WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- # General Public License for more details.
- #
- # You should have received a copy of the GNU Lesser General Public License
- # along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
- ; Common part of all paths
- ; So here's generally how mixer paths are used by PA: PA goes through
- ; a mixer path file from top to bottom and checks if a mixer element
- ; described therein exists. If so it is added to the list of mixer
- ; elements PA will control, keeping the order it read them in. If a
- ; mixer element described here has set the required= or
- ; required-absent= directives a path might not be accepted as valid
- ; and is ignored in its entirety (see below). However usually if a
- ; element listed here is missing this one element is ignored but not
- ; the entire path.
- ;
- ; When a device shall be muted/unmuted *all* elements listed in a path
- ; file with "switch = mute" will be toggled.
- ;
- ; When a device shall change its volume, PA will got through the list
- ; of all elements with "volume = merge" and set the volume on the
- ; first element. If that element does not support dB volumes, this is
- ; where the story ends. If it does support dB volumes, PA divides the
- ; requested volume by the volume that was set on this element, and
- ; then go on to the next element with "volume = merge" and then set
- ; that there, and so on. That way the first volume element in the
- ; path will be the one that does the 'biggest' part of the overall
- ; volume adjustment, with the remaining elements usually being set to
- ; some value next to 0dB. This logic makes sure we get the full range
- ; over all volume sliders and a very high granularity of volumes
- ; already in hardware.
- ;
- ; All switches and enumerations set to "select" are exposed via the
- ; "port" functionality of sinks/sources. Basically every possible
- ; switch setting and every possible enumeration setting will be
- ; combined and made into a "port". So make sure you don't list too
- ; many switches/enums for exposing, because the number of ports might
- ; rise exponentially.
- ;
- ; Only one path can be selected at a time. All paths that are valid
- ; for an audio device will be exposed as "port" for the sink/source.
- ; [General]
- ; priority = ... # Priority for this path
- ; description-key = ... # The path description is looked up from a table in path_verify() in
- ; # src/modules/alsa/alsa-mixer.c. By default the path name (i.e. the file name
- ; # minus the ".conf" suffix) is used as the lookup key, but if this option is
- ; # set, then the given string is used as the key instead. In any case the
- ; # "description" option can be used to override the path description.
- ; description = ... # Description for this path. Overrides the normal description lookup logic, as
- ; # described in the "description-key" documentation above.
- ; mute-during-activation = yes | no # If this path supports hardware mute, should the hw mute be used while activating this
- ; # path? In some cases this can reduce extra noises during port switching, while in other
- ; # cases this can increase such noises. Default: no.
- ; eld-device = ... # If this is an HDMI port, here's where to specify the device number for the ELD mixer
- ; # control. The default is to not make use of ELD information.
- ;
- ; [Properties] # Property list for this path. The list is merged into the port property list.
- ; <key> = <value> # Each property is defined on its own line.
- ; ...
- ;
- ; [Option ...:...] # For each option of an enumeration or switch element
- ; # that shall be exposed as a sink/source port. Needs to
- ; # be named after the Element, followed by a colon, followed
- ; # by the option name, resp. on/off if the element is a switch.
- ; name = ... # Logical name to use in the path identifier
- ; priority = ... # Priority if this is made into a device port
- ; required = ignore | enumeration | any # In this element, this option must exist or the path will be invalid. ("any" is an alias for "enumeration".)
- ; required-any = ignore | enumeration | any # In this element, either this or another option must exist (or an element)
- ; required-absent = ignore | enumeration | any # In this element, this option must not exist or the path will be invalid
- ;
- ; [Element ...] # For each element that we shall control
- ; required = ignore | switch | volume | enumeration | any # If set, require this element to be of this kind and available,
- ; # otherwise don't consider this path valid for the card
- ; required-any = ignore | switch | volume | enumeration | any # If set, at least one of the elements or jacks with required-any in this
- ; # path must be present, otherwise this path is invalid for the card
- ; required-absent = ignore | switch | volume # If set, require this element to not be of this kind and not
- ; # available, otherwise don't consider this path valid for the card
- ;
- ; switch = ignore | mute | off | on | select # What to do with this switch: ignore it, make it follow mute status,
- ; # always set it to off, always to on, or make it selectable as port.
- ; # If set to 'select' you need to define an Option section for on
- ; # and off
- ; volume = ignore | merge | off | zero | <volume step> # What to do with this volume: ignore it, merge it into the device
- ; # volume slider, always set it to the lowest value possible, or always
- ; # set it to 0 dB (for whatever that means), or always set it to
- ; # <volume step> (this only makes sense in path configurations where
- ; # the exact hardware and driver are known beforehand).
- ; volume-limit = <volume step> # Limit the maximum volume by disabling the volume steps above <volume step>.
- ; enumeration = ignore | select # What to do with this enumeration, ignore it or make it selectable
- ; # via device ports. If set to 'select' you need to define an Option section
- ; # for each of the items you want to expose
- ; direction = playback | capture # Is this relevant only for playback or capture? If not set this will implicitly be
- ; # set the direction of the PCM device is opened as. Generally this doesn't need to be set
- ; # unless you have a broken driver that has playback controls marked for capture or vice
- ; # versa
- ; direction-try-other = no | yes # If the element does not supported what is requested, try the other direction, too?
- ;
- ; override-map.1 = ... # Override the channel mask of the mixer control if the control only exposes a single channel
- ; override-map.2 = ... # Override the channel masks of the mixer control if the control only exposes two channels
- ; # Override maps should list for each element channel which high-level channels it controls via a
- ; # channel mask. A channel mask may either be the name of a single channel, or the words "all-left",
- ; # "all-right", "all-center", "all-front", "all-rear", and "all" to encode a specific subset of
- ; # channels in a mask
- ; [Jack ...] # For each jack that we will use for jack detection
- ; # The name 'Jack Foo' must match ALSA's 'Foo Jack' control.
- ; required = ignore | any # If not set to ignore, make the path invalid if this jack control is not present.
- ; required-absent = ignore | any # If not set to ignore, make the path invalid if this jack control is present.
- ; required-any = ignore | any # If not set to ignore, make the path invalid if no jack controls and no elements with
- ; # the required-any are present.
- ; state.plugged = yes | no | unknown # Normally a plugged jack would mean the port becomes available, and an unplugged means it's
- ; state.unplugged = yes | no | unknown # unavailable, but the port status can be overridden by specifying state.plugged and/or state.unplugged.
- [Element PCM]
- switch = mute
- volume = merge
- override-map.1 = all
- override-map.2 = all-left,all-right
- [Element External Amplifier]
- switch = select
- [Option External Amplifier:on]
- name = output-amplifier-on
- priority = 10
- [Option External Amplifier:off]
- name = output-amplifier-off
- priority = 0
- [Element Bass Boost]
- switch = select
- [Option Bass Boost:on]
- name = output-bass-boost-on
- priority = 0
- [Option Bass Boost:off]
- name = output-bass-boost-off
- priority = 10
- [Element IEC958]
- switch = off
- [Element IEC958 Optical Raw]
- switch = off
- ;;; 'Analog Output'
- [Element Analog Output]
- enumeration = select
- [Option Analog Output:Speakers]
- name = output-speaker
- priority = 10
- [Option Analog Output:Headphones]
- name = output-headphones
- priority = 9
- [Option Analog Output:FP Headphones]
- name = output-headphones
- priority = 8
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