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authorRicardo Wurmus <rekado@elephly.net>2019-10-29 15:07:25 +0100
committerRicardo Wurmus <rekado@elephly.net>2019-10-29 15:14:22 +0100
commit878e0e1bb0d15809c6582436d53498f3e6385524 (patch)
tree6a5f218aef256bd7ac7fce5c10417062b1cd0008 /doc/guix.texi
parent7ff157c16cc74d367978170815313a37fc0fff93 (diff)
gnu: mpd-service-type: Support configuration of outputs.
* gnu/services/audio.scm (<mpd-output>): New record type. (<mpd-configuration>)[outputs]: New field. (mpd-output, mpd-output?, mpd-output->string): New procedures. (mpd-config->file): Use mpd-output->string. * doc/guix.texi (Audio Services): Document mpd-output fields.
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@@ -22394,9 +22394,69 @@ The port to run mpd on.
The address that mpd will bind to. To use a Unix domain socket,
an absolute path can be specified here.
+@item @code{outputs} (default: @code{"(list (mpd-output))"})
+The audio outputs that MPD can use. By default this is a single output using pulseaudio.
+
+@end table
+@end deftp
+
+@deftp {Data Type} mpd-output
+Data type representing an @command{mpd} audio output.
+
+@table @asis
+@item @code{name} (default: @code{"MPD"})
+The name of the audio output.
+
+@item @code{type} (default: @code{"pulse"})
+The type of audio output.
+
+@item @code{enabled?} (default: @code{#t})
+Specifies whether this audio output is enabled when MPD is started. By
+default, all audio outputs are enabled. This is just the default
+setting when there is no state file; with a state file, the previous
+state is restored.
+
+@item @code{tags?} (default: @code{#t})
+If set to @code{#f}, then MPD will not send tags to this output. This
+is only useful for output plugins that can receive tags, for example the
+@code{httpd} output plugin.
+
+@item @code{always-on?} (default: @code{#f})
+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
+disconnect all listeners even when playback is accidentally stopped.
+
+@item @code{mixer-type}
+This field accepts a symbol 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}).
+
+@item @code{extra-options} (default: @code{'()"})
+An association list of option symbols to string values to be appended to
+the audio output configuration.
+
@end table
@end deftp
+The following example shows a configuration of @code{mpd} that provides
+an HTTP audio streaming output.
+
+@lisp
+(service mpd-service-type
+ (mpd-configuration
+ (outputs
+ (list (mpd-output
+ (name "streaming")
+ (type "httpd")
+ (mixer-type 'null)
+ (extra-options
+ `((encoder . "vorbis")
+ (port . "8080"))))))))
+@end lisp
+
+
@node Virtualization Services
@subsection Virtualization services