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pipewire: added troubleshooting crackling

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@ -13,6 +13,21 @@ Additionally `pipewire-alsa` and `pipewire-jack` for JACK and Alsa clients are
available and recommended to install for full compatibility with most software.
Make sure to restart to be sure everything is running correctly.
### Configuration
Pipewire has a few config files.
The needed folder structure can be created by the following command for a global setup.
```sh
sudo mkdir -p /etc/pipewire/ && sudo mkdir -p /etc/wireplumber/wireplumber.conf.d/ && sudo cp /usr/share/pipewire/*.conf /etc/pipewire/ && sudo cp /usr/share/wireplumber/wireplumber.conf.d/* /etc/wireplumber/wireplumber.conf.d/
```
It can also be done locally for the user with the following, alternative setup.
```sh
mkdir -p ~/.config/pipewire/ && mkdir -p ~/.config/wireplumber/wireplumber.conf.d/ && cp /usr/share/pipewire/*.conf ~/.config/pipewire/ && cp /usr/share/wireplumber/wireplumber.conf.d/* ~/.config/wireplumber/wireplumber.conf.d/
```
## Usage
This section will focus on the usage of Pipewire.
@ -219,3 +234,72 @@ The second part called `Application-Loopback 1 Playback` is available under the
allows to switch the selection of the output device.
Also in the `Playback` tab `Application-Loopback 1 Sink` can be selected as an output for currently
running applications which will loopback the sound to the selected output device.
## Troubleshooting
This section will focus on errors and the fixing of errors of Pipewire.
### Fix Crackling
Crackling can occur in various situations.
There is a [post by rabcor](https://forum.manjaro.org/t/howto-troubleshoot-crackling-in-pipewire/82442) that features multiple possibilities to fix this.
This section will list a few of them.
Firstly suspend can be deactivated to try to fix crackling.
In `alsa-vm.conf` the `suspend_timeout_seconds` have to be set to `0` like the following lines
show.
This also shows the general structure but only the line starting with `session` is to be added.
```txt
monitor.alsa.rules = [
{
actions = {
update-props = {
session.suspend-timeout-seconds = 0
}
]
```
Another possibility for crackling to occur is when the allowed rates are mismatched.
In `pipewire.conf` locate the following line.
```txt
#default.clock.allowed-rates = [ 48000 ]
```
Change this line to look like the following.
```txt
default.clock.allowed-rates = [ 44100 48000 ]
```
A third possibility to fix crackling is by adjusting the alsa headroom.
In `alsa-vm.conf` the locate the following line.
```txt
api.alsa.headroom = 2048
```
Change it to look like the following line.
```txt
api.alsa.headroom = 0
```
If this doesn't work values like 2048, 512, 256, 128, 64, 32 can also be tried.
A fourth possibility to fix crackling is by adjusting the alsa period size.
In `alsa-vm.conf` the locate the following line.
```txt
api.alsa.period-size = 1024
```
Change it to look like the following line.
```txt
api.alsa.period-size = 256
```
If this doesn't work values like 2048, 512, 128, 64 can also be tried.