Examples of simple audio and video synthesis in C.
The blog has many other interesting articles such as
http://nullprogram.com/blog/2017/10/06/     A branchless UTF-8 decoder
http://nullprogram.com/blog/2017/09/21/     Finding the Best 64-bit Simulation PRNG
http://nullprogram.com/blog/2017/09/15/     Blowpipe: a Blowfish-encrypted, Authenticated Pipe
https://nullprogram.com/blog/2020/05/15/   w64devkit: a Portable C and C++ Development Kit for Windows
https://nullprogram.com/blog/2020/01/22/   A Makefile for Emacs Packages
https://nullprogram.com/blog/2019/08/09/   Keyringless GnuPG