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# AURA Engine
This piece of Software is part of 'AURA - AUtomated RAdio'.
AURA Engine does:
* requesting the programme from an external Source
* switches the soundserver at the correct time to a given source for a specific show
* records what is broadcasted
## Installation
### Software
#### Operating System
Any sound supporting linux system should work. It is tested and coded on a **debian stretch**
#### Packages
On a debian machine:
```bash
liquidsoap liquidsoap-plugin-alsa liquidsoap-plugin-ao liquidsoap-plugin-faad \
liquidsoap-plugin-flac liquidsoap-plugin-icecast liquidsoap-plugin-lame \
liquidsoap-plugin-mad liquidsoap-plugin-ogg liquidsoap-plugin-pulseaudio \
liquidsoap-plugin-samplerate liquidsoap-plugin-taglib liquidsoap-plugin-voaacenc \
liquidsoap-plugin-vorbis
```
#### Python Packages
```
sudo pip3 install Flask Flask-Babel flask-babel-utclocal-utils \
flask-mongoengine Flask-RESTful Flask-SQLAlchemy Flask-WTF \
mysqlclient redis simplejson
```
#### aura.py
It is the server which is connected to the external programme source, to liquidsoap and is listening for redis pubsub messages.
#### Guru
The commandline tool for interacting with the server.
#### Liquidsoap
The heart of AURA Engine. It uses the built in mixer, to switch between different sources. A source can be a stream, the filesystem or linein
### Hardware

Gottfried Gaisbauer
committed
#### Soundcard
AURA Engine ist tested with an ASUS Xonar DGX. It should work with every by ALSA supported soundcard. PulseAudio support is planned.

Gottfried Gaisbauer
committed
#### Hard/Soft
When you use ALSA, you will have to play around with ALSA settings. In the folder ./modules/liquidsoap is a scipt called alsa_settings_tester.liq. You can start it with 'liquidsoap -v --debug alsa_settings_tester.liq'. Changing and playing with settings can help you to find correct ALSA settings.