• Contact: nia
• Mentors: nia
• Duration estimate: 350h

NetBSD includes various simple, command-line audio tools by default, such as audioplay(1), audiorecord(1), mixerctl(1), aiomixer(1), audiocfg(1)...

These tools are useful because they provide almost everything a user needs to test basic functionality of their audio hardware. They are critically important for basic diagnostics.

It would be nice to have a tool to easily visualize audio input using a simple Curses interface. Some ideas for its possible functionality:

• Display basic live-updating frequency graph using bars
• Display channels separately
• 'Echo' option (play back audio as it is input)
• pad(4) support (NetBSD has support for 'virtual' audio devices. This is useful because you can record the output of an application by having it output to the audio device that opening /dev/pad creates. This can also 'echo' by outputting the data read from the pad device.)

You need NetBSD installed on physical hardware (older laptops work well and are cheaply available) and a microphone for this project. Applicants should be familiar with the C programming language.