Add alsa support

[japiotr123]

Hello
I removed pulseaudio, are you want to add support for alsa?

[pzmarzly]

I removed pulseaudio, are you want to add support for alsa?

Hi. While I'm not interested in writing ALSA version myself, I could merge the script if someone created a nicely working one.

Here are some links that hopefully will be helpful for someone:

• https://www.alsa-project.org/main/index.php/Matrix:Module-aloop
• https://www.kernel.org/doc/html/v4.11/sound/alsa-configuration.html

Disclaimer: if you are a Linux beginner reading the pages linked above: don't compile the packages from scratch, use your distribution's repositories. By the way, you probably don't want to have PulseAudio removed in the first place, though check out Jack if you need to keep latency low.

If you want a quick hack, you can just remove all pactl, paid, and pacmd stuff from the code, run sudo modprobe snd-aloop before running the script, and select correct input and output devices manually. This method should work for most programs.