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13.3.11 Services de son personnels

The (gnu home services sound) module provides services related to sound support.

The following services dynamically reconfigure the PulseAudio sound server: they let you toggle broadcast of audio output over the network using the RTP (real-time transport protocol) and, correspondingly, playback of sound received over RTP. Once home-pulseaudio-rtp-sink-service-type is among your home services, you can start broadcasting audio output by running this command:

herd start pulseaudio-rtp-sink

You can then run a PulseAudio-capable mixer, such as pavucontrol or pulsemixer (both from the same-named package) to control which audio stream(s) should be sent to the RTP “sink”.

By default, audio is broadcasted to a multicast address: any device on the LAN (local area network) receives it and may play it. Using multicast in this way puts a lot of pressure on the network and degrades its performance, so you may instead prefer sending to specifically one device. The first way to do that is by specifying the IP address of the target device when starting the service:

herd start pulseaudio-rtp-sink

The other option is to specify this IP address as the one to use by default in your home environment configuration:

(service home-pulseaudio-rtp-sink-service-type

On the device where you intend to receive and play the RTP stream, you can use home-pulseaudio-rtp-source-service-type, like so:

(service home-pulseaudio-rtp-source-service-type)

This will then let you start the receiving module for PulseAudio:

herd start pulseaudio-rtp-source

Again, by default it will listen on the multicast address. If, instead, you’d like it to listen for direct incoming connections, you can do that by running:

(service home-pulseaudio-rtp-source-service-type

The reference of these services is given below.

Variable :home-pulseaudio-rtp-sink-service-type
Variable :home-pulseaudio-rtp-source-service-type

This is the type of the service to send, respectively receive, audio streams over RTP (real-time transport protocol).

The value associated with this service is the IP address (a string) where to send, respectively receive, the audio stream. By default, audio is sent/received on multicast address %pulseaudio-rtp-multicast-address.

This service defines one Shepherd service: pulseaudio-rtp-sink, respectively pulseaudio-rtp-source. The service is not started by default, so you have to explicitly start it when you want to turn it on, as in this example:

herd start pulseaudio-rtp-sink

Stopping the Shepherd service turns off broadcasting.

Variable :%pulseaudio-rtp-multicast-address

This is the multicast address used by default by the two services above.

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