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<title>PulseAudio Loopback Switch - Home Assistant</title>
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<meta name="description" content="Instructions how to use Pulseaudio loopback modules to build a flexible whole-home audio system.">
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<header>
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<h1 class="title indent">
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PulseAudio Loopback Switch
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</h1>
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</header>
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<hr class="divider">
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<p>The goal behind this switch is to allow a very flexible whole home audio system based upon PulseAudio.</p>
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<p>For example, for a system with a 7.1 surround sound card, and 3 instances of mpd 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.</p>
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<p>The benefit of this approach is that this audio routing can occur without modifying the design-time configuration of mpd or PulseAudio.</p>
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<p>This component uses a TCP connection to control a local or remote PulseAudio server- so there are no local dependencies.</p>
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<p>To enable this switch, add the following lines to your <code class="highlighter-rouge">configuration.yaml</code> file:</p>
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<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yaml entry</span>
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<span class="s">switch</span><span class="pi">:</span>
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<span class="s">platform</span><span class="pi">:</span> <span class="s">pulseaudio_loopback</span>
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<span class="s">name</span><span class="pi">:</span> <span class="s">mpd1 -> bedroom</span>
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<span class="s">host</span><span class="pi">:</span> <span class="s">127.0.0.1</span>
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<span class="s">port</span><span class="pi">:</span> <span class="s">4712</span>
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<span class="s">source_name</span><span class="pi">:</span> <span class="s">mpd1.monitor</span>
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<span class="s">sink_name</span><span class="pi">:</span> <span class="s">bedroom</span>
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</code></pre>
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</div>
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<p>Configuration variables:</p>
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<ul>
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<li><strong>sink_name</strong> (<em>Required</em>): The name of the Pulseaudio sink that will recieve the audio.</li>
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<li><strong>source_name</strong> (<em>Required</em>): The name of the Pulseaudio source that will supply the audio.</li>
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<li><strong>name</strong> (<em>Optional</em>): Name of the switch.</li>
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<li><strong>host</strong> (<em>Optional</em>): The IP address or host name of the PulseAudio server. If not specified, 127.0.0.1 is used.</li>
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<li><strong>port</strong> (<em>Optional</em>): The port that Pulseaudio is listening on. Defaults to 4712.</li>
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<li><strong>buffer_size</strong> (<em>Optional</em>): How much data to load from Pulseaudio at once. Default is 1KB.</li>
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<li><strong>tcp_timeout</strong> (<em>Optional</em>): How long to wait for a response from Pulseaudio before giving up. Default is 3 seconds.</li>
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</ul>
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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
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this component, module-cli-protocol must be loaded on the PulseAudio server.
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</p>
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<div class='edit-github'><a href='https://github.com/home-assistant/home-assistant.github.io/tree/current/source/_components/switch.pulseaudio_loopback.markdown'>Edit this page on GitHub</a></div>
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IoT class<sup><a href='/blog/2016/02/12/classifying-the-internet-of-things/#classifiers'><i class="icon-info-sign"></i></a></sup>: Local Polling
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<div class='section'>
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Introduced in release: 0.16
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This is a platform for
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<a href='/components/switch/'>the Switches component</a>.
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<h1 class="title delta">Category Switch</h1>
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