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52 lines
2.3 KiB
Markdown
52 lines
2.3 KiB
Markdown
---
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layout: page
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title: "PulseAudio Loopback Switch"
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description: "Instructions how to use Pulseaudio loopback modules to build a flexible whole-home audio system."
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date: 2016-03-22 21:00:00
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sidebar: true
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comments: false
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sharing: true
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footer: true
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logo: pulseaudio.png
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ha_category: Switch
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ha_release: 0.16
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ha_iot_class: "Local Polling"
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---
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The goal behind this switch is to allow a very flexible whole home audio system based upon [PulseAudio](https://www.freedesktop.org/wiki/Software/PulseAudio/).
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For example, for a system with a 7.1 surround sound card, and 3 instances of [MPD](https://www.musicpd.org/) running, it is possible to quickly route the output of any MPD instance to any of the 8 possible (4 stereo) channels on the sound card, by loading/unloading a loopback module. This loading/unloading functionality is provided by this component. When the switch is `on`, the loopback module is loaded. When the switch is `off`, the module is not loaded.
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The benefit of this approach is that this audio routing can occur without modifying the design-time configuration of MPD or PulseAudio.
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This component uses a TCP connection to control a local or remote PulseAudio server. So there are no local dependencies.
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To enable this switch, add the following lines to your `configuration.yaml` file:
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```yaml
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# Example configuration.yaml entry
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switch:
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- platform: pulseaudio_loopback
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name: mpd1 -> bedroom
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host: 127.0.0.1
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port: 4712
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source_name: mpd1.monitor
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sink_name: bedroom
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```
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Configuration variables:
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- **sink_name** (*Required*): The name of the Pulseaudio sink that will recieve the audio.
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- **source_name** (*Required*): The name of the Pulseaudio source that will supply the audio.
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- **name** (*Optional*): Name of the switch.
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- **host** (*Optional*): The IP address or host name of the PulseAudio server. If not specified, 127.0.0.1 is used.
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- **port** (*Optional*): The port that Pulseaudio is listening on. Defaults to 4712.
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- **buffer_size** (*Optional*): How much data to load from Pulseaudio at once. Default is 1KB.
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- **tcp_timeout** (*Optional*): How long to wait for a response from Pulseaudio before giving up. Default is 3 seconds.
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<p class='note warning'>
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This component relies on raw TCP commands to PulseAudio. In order for PulseAudio to accept commands with this component, `module-cli-protocol` must be loaded on the PulseAudio server.
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</p>
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