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The (gnu services sound)
module provides a service to configure the
Advanced Linux Sound Architecture (ALSA) system, which makes PulseAudio the
preferred ALSA output driver.
This is the type for the Advanced Linux
Sound Architecture (ALSA) system, which generates the
/etc/asound.conf configuration file. The value for this type is a
alsa-configuration
record as in this example:
See below for details about alsa-configuration
.
Data type representing the configuration for alsa-service
.
alsa-plugins
(default: alsa-plugins)alsa-plugins
package to use.
pulseaudio?
(default: #t)Whether ALSA applications should transparently be made to use the PulseAudio sound server.
Using PulseAudio allows you to run several sound-producing applications at
the same time and to individual control them via pavucontrol
,
among other things.
extra-options
(default: "")String to append to the /etc/asound.conf file.
Individual users who want to override the system configuration of ALSA can do it with the ~/.asoundrc file:
# In guix, we have to specify the absolute path for plugins. pcm_type.jack { lib "/home/alice/.guix-profile/lib/alsa-lib/libasound_module_pcm_jack.so" } # Routing ALSA to jack: # <http://jackaudio.org/faq/routing_alsa.html>. pcm.rawjack { type jack playback_ports { 0 system:playback_1 1 system:playback_2 } capture_ports { 0 system:capture_1 1 system:capture_2 } } pcm.!default { type plug slave { pcm "rawjack" } }
See https://www.alsa-project.org/main/index.php/Asoundrc for the details.
This is the type for the PulseAudio
sound server. It exists to allow system overrides of the default settings
via pulseaudio-configuration
, see below.
Внимание: This service overrides per-user configuration files. If you want PulseAudio to honor configuration files in ~/.config/pulse you have to unset the environment variables
PULSE_CONFIG
andPULSE_CLIENTCONFIG
in your ~/.bash_profile.
Внимание: This service on its own does not ensure, that the
pulseaudio
package exists on your machine. It merely adds configuration files for it, as detailed below. In the (admittedly unlikely) case, that you find yourself without apulseaudio
package, consider enabling it through thealsa-service-type
above.
Data type representing the configuration for pulseaudio-service
.
features
(default: '()
)List of settings to set in client.conf. Accepts a list of strings or symbol-value pairs. A string will be inserted as-is with a newline added. A pair will be formatted as “key = value”, again with a newline added.
features
(default: '()
)List of settings to set in daemon.conf, formatted just like client-conf.
features
(default: '()
)Script file to use as default.pa. In case the
extra-script-files
field below is used, an .include
directive
pointing to /etc/pulse/default.pa.d is appended to the provided
script.
extra-script-files
(default: '()
)A list of file-like objects defining extra PulseAudio scripts to run at the
initialization of the pulseaudio
daemon, after the main
script-file
. The scripts are deployed to the
/etc/pulse/default.pa.d directory; they should have the ‘.pa’
file name extension. For a reference of the available commands, refer to
man pulse-cli-syntax
.
system-script-file
(default: (file-append pulseaudio "/etc/pulse/system.pa")
)Script file to use as system.pa.
The example below sets the default PulseAudio card profile, the default sink and the default source to use for a old SoundBlaster Audigy sound card:
(pulseaudio-configuration
(extra-script-files
(list (plain-file "audigy.pa"
(string-append "\
set-card-profile alsa_card.pci-0000_01_01.0 \
output:analog-surround-40+input:analog-mono
set-default-source alsa_input.pci-0000_01_01.0.analog-mono
set-default-sink alsa_output.pci-0000_01_01.0.analog-surround-40\n")))))
Note that pulseaudio-service-type
is part of
%desktop-services
; if your operating system declaration was derived
from one of the desktop templates, you’ll want to adjust the above example
to modify the existing pulseaudio-service-type
via
modify-services
(see modify-services
),
instead of defining a new one.
This service sets the LADSPA_PATH variable, so that programs, which respect it, e.g. PulseAudio, can load LADSPA plugins.
The following example will setup the service to enable modules from the
swh-plugins
package:
(service ladspa-service-type
(ladspa-configuration (plugins (list swh-plugins))))
See http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html for the details.
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