38 lines
2.8 KiB
Markdown
38 lines
2.8 KiB
Markdown
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---
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layout: developersguide
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title: Audio & Voice
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---
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{% include base.html %}
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# Audio & Voice
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openHAB provides a modular architecture that enables all kinds of different use cases.
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At its core, there is the notion of an _audio stream_.
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Audio streams are provided by _audio sources_ and consumed by _audio sinks_.
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Each binding for handling and controlling audio services can implement an audio sink to provide their supported devices to the framework to be used as sound output.
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An audio sink is identified by an unique id which in general is similar to the thing type id.
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The framework itself can handle multiple audio sinks at the same time.
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## Build-in Audio Sinks
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The distribution comes with these built-in audio sinks options:
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| Output device | Audio sink | Description |
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|-------------------|-----------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| javasound | System Speaker | This uses the JRE sound drivers to play audio to the local sound interface. |
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| enhancedjavasound | System Speaker (with mp3 support) | This uses the JRE sound drivers plus an additional 3rd party library, which adds support for mp3 files. |
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| webaudio | Web Audio | If sounds should not be played on the server but on the client: This sink sends the audio stream through HTTP to web clients, which then cause it to be played back by the browser. The browser needs to be opened and have a compatible UI running. Currently this feature is supported by Paper UI and HABPanel. |
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The framework is able to play sound either from the file system, from URLs (e.g. Internet radio streams) or generated by text-to-speech engines (which are available as optional Voice add-ons).
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## Audio sink implementation
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TODO
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## Audio source implementation
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TODO
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