Moon Noise.
This is a quick-and-dirty noise generator built on, and demonstrating, the Luasynth audio framework. Chains of oscillators and effects are created, with random parameters, and layered on top of one another. It sounds kind of interesting for about 2 minutes.
Running it
Get LuaJIT. Clone this repo, then, inside the repo, run:
git submodule init
git submodule update
to fetch Luasynth.
Now, Moon Noise has no code for actually playing the audio. All it does is compute the audio and output numbers (32-bit floating point numbers, to be precise) that represent that audio. To save the audio to a file, which is the simplest way to use Moon Noise, you can do this:
luajit moon.lua >audio.f32
Listening to the output
Some audio programs will let you open the audio.f32 file you just created
above, so you can listen offline. Tell the program it's a 32-bit float,
2-channel, raw audio file with a sampling rate of 44100 Hz.
A more fun way to listen is to pipe the audio into a program that plays it. If you install SoX, a cross-platform audio tool, you can do it like this:
luajit moon.lua | sox -tf32 -c2 -r44100 -q - -d
SoX may print out a couple warning messages, but this is tested to work on both Linux and Windows, and almost certainly works on OS X too (please file an issue if it doesn't!).
An alternative method using my fmt program
from here is a bit nicer, but only
works on Linux:
luajit moon.lua | fmt -16 | aplay -qfcd
Colophon
I made this at Hacker School, which was an awesome experience. If you're interested in leveling up as a programmer, you should apply.
Thanks to @Adhesion for testing this on Windows.