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-rw-r--r--doc/guix.texi11
-rw-r--r--gnu/services/audio.scm15
2 files changed, 16 insertions, 10 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 7df9a6b8a2..67928d290d 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -34417,8 +34417,9 @@ Partitions} for available options.
@end table
@end deftp
+@c %start of fragment
@deftp {Data Type} mpd-output
-Data type representing a @command{mpd} audio output.
+Available @code{mpd-output} fields are:
@table @asis
@item @code{name} (default: @code{"MPD"}) (type: string)
@@ -34445,15 +34446,16 @@ is only useful for output plugins that can receive tags, for example the
@item @code{always-on?} (default: @code{#f}) (type: boolean)
If set to @code{#t}, then MPD attempts to keep this audio output always
-open. This may be useful for streaming servers, when you don?t want to
+open. This may be useful for streaming servers, when you don’t want to
disconnect all listeners even when playback is accidentally stopped.
-@item @code{mixer-type} (default: @code{"none"}) (type: string)
+@item @code{mixer-type} (type: maybe-string)
This field accepts a string that specifies which mixer should be used
for this audio output: the @code{hardware} mixer, the @code{software}
mixer, the @code{null} mixer (allows setting the volume, but with no
effect; this can be used as a trick to implement an external mixer
-External Mixer) or no mixer (@code{none}).
+External Mixer) or no mixer (@code{none}). When left unspecified, a
+@code{hardware} mixer is used for devices that support it.
@item @code{replay-gain-handler} (type: maybe-string)
This field accepts a string that specifies how
@@ -34468,6 +34470,7 @@ appended to the audio output configuration.
@end table
@end deftp
+@c %end of fragment
The following example shows a configuration of @command{mpd} that
configures some of its plugins and provides a HTTP audio streaming output.
diff --git a/gnu/services/audio.scm b/gnu/services/audio.scm
index 540b12d4c3..3083090ad0 100644
--- a/gnu/services/audio.scm
+++ b/gnu/services/audio.scm
@@ -362,15 +362,18 @@ open. This may be useful for streaming servers, when you don’t want to
disconnect all listeners even when playback is accidentally stopped.")
(mixer-type
- (string "none")
- "This field accepts a string that specifies which mixer should be used
-for this audio output: the @code{hardware} mixer, the @code{software}
-mixer, the @code{null} mixer (allows setting the volume, but with no
-effect; this can be used as a trick to implement an external mixer
-External Mixer) or no mixer (@code{none})."
+ maybe-string
+ "This field accepts a string that specifies which mixer should be used for
+this audio output: the @code{hardware} mixer, the @code{software} mixer, the
+@code{null} mixer (allows setting the volume, but with no effect; this can be
+used as a trick to implement an external mixer External Mixer) or no
+mixer (@code{none}). When left unspecified, a @code{hardware} mixer is used
+for devices that support it."
(sanitizer
(lambda (x) ; TODO: deprecated, remove me later.
(cond
+ ((eq? %unset-value x)
+ x)
((symbol? x)
(warning (G_ "symbol value for 'mixer-type' is deprecated, \
use string instead~%"))