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doc: cookbook: Add section on MPD with bluealsa.
* doc/guix-cookbook.texi (Music Server with Bluetooth Audio): New section under System Configuration.
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Ricardo Wurmus
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@ -101,6 +101,7 @@ System Configuration
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* Setting up a bind mount:: Setting up a bind mount in the file-systems definition.
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* Getting substitutes from Tor:: Configuring Guix daemon to get substitutes through Tor.
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* Setting up NGINX with Lua:: Configuring NGINX web-server to load Lua modules.
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* Music Server with Bluetooth Audio:: Headless music player with Bluetooth output.
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@end detailmenu
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@end menu
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@ -1385,6 +1386,7 @@ reference.
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* Setting up a bind mount:: Setting up a bind mount in the file-systems definition.
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* Getting substitutes from Tor:: Configuring Guix daemon to get substitutes through Tor.
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* Setting up NGINX with Lua:: Configuring NGINX web-server to load Lua modules.
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* Music Server with Bluetooth Audio:: Headless music player with Bluetooth output.
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@end menu
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@node Auto-Login to a Specific TTY
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@ -2462,6 +2464,195 @@ ngx.say(stdout)
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#$(local-file "index.lua"))))))))))))))
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@end lisp
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@node Music Server with Bluetooth Audio
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@section Music Server with Bluetooth Audio
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@cindex mpd
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@cindex music server, headless
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@cindex bluetooth, ALSA configuration
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MPD, the Music Player Daemon, is a flexible server-side application for
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playing music. Client programs on different machines on the network ---
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a mobile phone, a laptop, a desktop workstation --- can connect to it to
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control the playback of audio files from your local music collection.
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MPD decodes the audio files and plays them back on one or many outputs.
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By default MPD will play to the default audio device. In the example
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below we make things a little more interesting by setting up a headless
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music server. There will be no graphical user interface, no Pulseaudio
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daemon, and no local audio output. Instead we will configure MPD with
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two outputs: a bluetooth speaker and a web server to serve audio streams
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to any streaming media player.
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Bluetooth is often rather frustrating to set up. You will have to pair
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your Bluetooth device and make sure that the device is automatically
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connected as soon as it powers on. The Bluetooth system service
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returned by the @code{bluetooth-service} procedure provides the
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infrastructure needed to set this up.
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Reconfigure your system with at least the following services and
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packages:
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@lisp
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(operating-system
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;; …
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(packages (cons* bluez bluez-alsa
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%base-packages))
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(services
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;; …
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(dbus-service #:services (list bluez-alsa))
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(bluetooth-service #:auto-enable? #t)))
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@end lisp
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Start the @code{bluetooth} service and then use @command{bluetoothctl}
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to scan for Bluetooth devices. Try to identify your Bluetooth speaker
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and pick out its device ID from the resulting list of devices that is
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indubitably dominated by a baffling smorgasbord of your neighbors' home
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automation gizmos. This only needs to be done once:
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@example
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$ bluetoothctl
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[NEW] Controller 00:11:22:33:95:7F BlueZ 5.40 [default]
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[bluetooth]# power on
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[bluetooth]# Changing power on succeeded
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[bluetooth]# agent on
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[bluetooth]# Agent registered
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[bluetooth]# default-agent
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[bluetooth]# Default agent request successful
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[bluetooth]# scan on
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[bluetooth]# Discovery started
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[CHG] Controller 00:11:22:33:95:7F Discovering: yes
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[NEW] Device AA:BB:CC:A4:AA:CD My Bluetooth Speaker
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[NEW] Device 44:44:FF:2A:20:DC My Neighbor's TV
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@dots{}
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[bluetooth]# pair AA:BB:CC:A4:AA:CD
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Attempting to pair with AA:BB:CC:A4:AA:CD
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[CHG] Device AA:BB:CC:A4:AA:CD Connected: yes
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[My Bluetooth Speaker]# [CHG] Device AA:BB:CC:A4:AA:CD UUIDs: 0000110b-0000-1000-8000-00xxxxxxxxxx
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[CHG] Device AA:BB:CC:A4:AA:CD UUIDs: 0000110c-0000-1000-8000-00xxxxxxxxxx
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[CHG] Device AA:BB:CC:A4:AA:CD UUIDs: 0000110e-0000-1000-8000-00xxxxxxxxxx
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[CHG] Device AA:BB:CC:A4:AA:CD Paired: yes
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Pairing successful
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[CHG] Device AA:BB:CC:A4:AA:CD Connected: no
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[bluetooth]#
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[bluetooth]# trust AA:BB:CC:A4:AA:CD
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[bluetooth]# [CHG] Device AA:BB:CC:A4:AA:CD Trusted: yes
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Changing AA:BB:CC:A4:AA:CD trust succeeded
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[bluetooth]#
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[bluetooth]# connect AA:BB:CC:A4:AA:CD
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Attempting to connect to AA:BB:CC:A4:AA:CD
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[bluetooth]# [CHG] Device AA:BB:CC:A4:AA:CD RSSI: -63
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[CHG] Device AA:BB:CC:A4:AA:CD Connected: yes
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Connection successful
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[My Bluetooth Speaker]# scan off
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[CHG] Device AA:BB:CC:A4:AA:CD RSSI is nil
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Discovery stopped
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[CHG] Controller 00:11:22:33:95:7F Discovering: no
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@end example
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Congratulations, you can now automatically connect to your Bluetooth
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speaker!
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It is now time to configure ALSA to use the @emph{bluealsa} Bluetooth
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module, so that you can define an ALSA pcm device corresponding to your
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Bluetooth speaker. For a headless server using @emph{bluealsa} with a
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fixed Bluetooth device is likely simpler than configuring Pulseaudio and
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its stream switching behavior. We configure ALSA by crafting a custom
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@code{alsa-configuration} for the @code{alsa-service-type}. The
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configuration will declare a @code{pcm} type @code{bluealsa} from the
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@code{bluealsa} module provided by the @code{bluez-alsa} package, and
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then define a @code{pcm} device of that type for your Bluetooth speaker.
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All that is left then is to make MPD send audio data to this ALSA
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device. We also add a secondary MPD output that makes the currently
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played audio files available as a stream through a web server on port
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8080. When enabled a device on the network could listen to the audio
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stream by connecting any capable media player to the HTTP server on port
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8080, independent of the status of the Bluetooth speaker.
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What follows is the outline of an @code{operating-system} declaration
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that should accomplish the above-mentioned tasks:
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@lisp
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(use-modules (gnu))
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(use-service-modules audio dbus sound #;… etc)
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(use-package-modules audio linux #;… etc)
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(operating-system
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;; …
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(packages (cons* bluez bluez-alsa
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%base-packages))
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(services
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;; …
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(service mpd-service-type
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(mpd-configuration
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(user "your-username")
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(music-dir "/path/to/your/music")
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(address "192.168.178.20")
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(outputs (list (mpd-output
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(type "alsa")
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(name "MPD")
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(extra-options
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;; Use the same name as in the ALSA
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;; configuration below.
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'((device . "pcm.btspeaker"))))
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(mpd-output
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(type "httpd")
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(name "streaming")
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(enabled? #false)
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(always-on? #true)
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(tags? #true)
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(mixer-type 'null)
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(extra-options
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'((encoder . "vorbis")
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(port . "8080")
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(bind-to-address . "192.168.178.20")
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(max-clients . "0") ;no limit
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(quality . "5.0")
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(format . "44100:16:1"))))))))
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(dbus-service #:services (list bluez-alsa))
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(bluetooth-service #:auto-enable? #t)
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(service alsa-service-type
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(alsa-configuration
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(pulseaudio? #false) ;we don't need it
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(extra-options
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#~(string-append "\
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# Declare Bluetooth audio device type \"bluealsa\" from bluealsa module
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pcm_type.bluealsa @{
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lib \"" #$(file-append bluez-alsa "/lib/alsa-lib/libasound_module_pcm_bluealsa.so") "\"
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@}
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# Declare control device type \"bluealsa\" from the same module
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ctl_type.bluealsa @{
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lib \"" #$(file-append bluez-alsa "/lib/alsa-lib/libasound_module_ctl_bluealsa.so") "\"
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@}
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# Define the actual Bluetooth audio device.
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pcm.btspeaker @{
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type bluealsa
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device \"AA:BB:CC:A4:AA:CD\" # unique device identifier
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profile \"a2dp\"
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@}
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# Define an associated controller.
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ctl.btspeaker @{
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type bluealsa
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@}
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"))))))
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@end lisp
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Enjoy the music with the MPD client of your choice or a media player
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capable of streaming via HTTP!
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@c *********************************************************************
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@node Containers
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@chapter Containers
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