This guide helps to set up audio redirection in OneClickDesktop server with pulseaudio.  The idea is to mimic a sound card and redirect sound signal such that you can watch videos and listen to songs on your server.
Note: **This guide only works for Ubuntu 18/20 and Debian 10, in XRDP mode.**  It will ***NOT*** work on ***CentOS***.  It will ***NOT*** work in ***VNC mode***.

Before starting, this tutorial assumes that you already have OneClickDesktop server installed and running.  It also assumes that you have a non-root user for the desktop.  **The audio will NOT work for the root user.**

If you haven't yet created a non-root user, you can run the following two commands in SSH to create a non-root, sudo user.
```
adduser your_username
usermod -aG sudo your_username
```

## 1. Build pulseaudio and pulseaudio-xrdp
Run the following command to build pulseaudio and pulseaudio-xrdp.
```
wget https://raw.githubusercontent.com/Har-Kuun/OneClickDesktop/master/plugins/Audio/AudioRedirectionSetup.sh && sudo bash AudioRedirectionSetup.sh
```
After running the script, please **reboot** your server.

## 2. Set up volume control in desktop
Because of a known glitch of pulseaudio in newer versions of Ubuntu and Debian, there are a couple of post-installation steps required before hearing sound from your server.

### Ubuntu 18
Ubuntu 18 is the easiest.  Simply log into your server desktop with a non-root user, and you should be ready to use audio out-of-the-box.

### Ubuntu 20
1. Log into your server desktop with a non-root user.

2. Check your volume control.

![Ubuntu 20 volume control](https://raw.githubusercontent.com/Har-Kuun/OneClickDesktop/master/plugins/Audio/Ubuntu20_1.png)

3. If it only shows **Dummy Output** like in the image above, **log out** from your **desktop** and re-login.  **Logout and log in from SSH will NOT work.**

![Ubuntu 20 desktop logout](https://raw.githubusercontent.com/Har-Kuun/OneClickDesktop/master/plugins/Audio/Ubuntu20_2.png)

4. Log into the desktop with the same user.  Check your volume control again, and it should have **xrdp sink** now, and you are now ready to use audio.

![Ubuntu 20 pulseaudio sink](https://raw.githubusercontent.com/Har-Kuun/OneClickDesktop/master/plugins/Audio/Ubuntu20_3.png)

If it still does not work, please follow steps in the Debian 10 section.

### Debian 10
1. Log into your server desktop with a non-root user.

2. Check your volume control.  It should only show **Dummy Output** like in the image below.

![Debian 10 volume control](https://raw.githubusercontent.com/Har-Kuun/OneClickDesktop/master/plugins/Audio/Debian_1.png)

3. Bring up a terminal within your desktop (**SSH will NOT work**), and run the following command.
```
pulseaudio -k && pulseaudio
```
It is essential that you run this command in **a single line**, such that it produces an internal error, forcing itself to stop.  You should see outputs similar to below.

![Debian 10 pulseaudio reset](https://raw.githubusercontent.com/Har-Kuun/OneClickDesktop/master/plugins/Audio/Debian_2.png)

Then press CTRL+C to exit to the terminal.

4. Run the following command to start pulseaudio in the background.
```
pulseaudio &
```
Then press CTRL+C to exit to the terminal.

![Debian 10 pulseaudio start](https://raw.githubusercontent.com/Har-Kuun/OneClickDesktop/master/plugins/Audio/Debian_3.png)

You should now see **xrdp sink** in your volume control now, indicating that you have sound.

中文详细教程请看这里：https://qing.su/article/pulseaudio-audio-redirection-oneclickdesktop.html

Please report any issue that you encounter during the Audio redirection setup.