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diff --git a/src/multi-room-audio.thrust b/src/multi-room-audio.thrust new file mode 100644 index 0000000..078de3c --- /dev/null +++ b/src/multi-room-audio.thrust @@ -0,0 +1,58 @@ +--- +title: multi-room audio +subtitle: Audio, in rooms. Multiple rooms. +date: 2020-04-08 +--- +{% extends 'templates/base.html' %} +{% block body %} + <nav> + <a href='/projects'>> projects</a> + </nav> + + <header> + <h1>{{ title }}</h1> + <p>{{ subtitle }}</p> + </header> + + <article> + {% markdown %} + I briefly tried using [PulseAudio over the network](https://wiki.archlinux.org/index.php/PulseAudio/Examples#PulseAudio_over_network), but decided to use [Snapcast](https://github.com/badaix/snapcast) instead. + Snapcast seems to be more tolerant of network issues, doesn't require installing PulseAudio on otherwise headless machines, and has pretty good synchronization between rooms. + + A Snapcast installation is split into one _Snapserver_ and multiple _Snapclients_. + Audio comes in to the Snapserver from one or more sources, and is broadcast out to the Snapclients, with a minor delay for synchronization. + + On the machine being the Snapserver, install the `snapserver` package from APT, and configure its audio sources. + This snippet configures two sources: + + - For [MPD controlled by UPnP](https://www.lesbonscomptes.com/upmpdcli/), it + - reads from a named pipe at `/tmp/snapfifo`, + - and presents it in the Snapcast UI as `UPnP`. + - For [AirPlay](https://en.wikipedia.org/wiki/AirPlay), it + - starts the binary `/usr/bin/shairport-sync`, + - presents it in the UI as `AirPlay`, + - sets it to use 44.1Khz output instead of 48Khz, + - and logs `shairport-sync`'s stderr. + - `shairport-sync` itself is configured to output audio to its stdout. + + ```sh + $ cat /etc/default/snapserver + SNAPSERVER_OPTS="--stream pipe:///tmp/snapfifo?name=UPnP --stream process:///usr/bin/shairport-sync?name=AirPlay&sampleformat=44100:16:2&log_stderr=true" + ``` + + On all the machines being Snapclients, install the `snapclient` package, and configure their human-readable names. + For example, for the Snapclient in my living room: + + ```sh + $ cat /etc/default/snapcast + SNAPCLIENT_OPTS="--hostID 'Living Room'" + ``` + + ## Control + + I primarily control Snapcast using a [CatBus](/catbus) daemon. + + In addition, I have configured both `shairport-sync` and `upmpdcli` to switch Snapcast to their respective input when they start playing. + {% endmarkdown %} + </article> +{% endblock %} |