Nostalgia bucklespring keyboard sound

Copyright 2016 Ico Doornekamp

This project emulates the sound of my old faithful IBM Model-M space saver bucklespring keyboard while typing on my notebook, mainly for the purpose of annoying the hell out of my coworkers.

Bucklespring runs as a background process and plays back the sound of each key pressed and released on your keyboard, just as if you were using an IBM Model-M. The sound of each key has carefully been sampled, and is played back while simulating the proper distance and direction for a realistic 3D sound palette of pure nostalgic bliss.

To temporarily silence bucklespring, for example to enter secrets, press ScrollLock twice (but be aware that those ScrollLock events are delivered to the application); same to unmute. The keycode for muting can be changed with the -m option. Use keycode 0 to disable the mute function.

Installation

Linux

To compile on debian-based linux distributions, first make sure the require libraries and header files are installed, then simply run make:

$ sudo apt-get install libopenal-dev libalure-dev libxtst-dev
$ make
$ ./buckle

MacOS

I've heard rumours that bucklespring also runs on MacOS. I've been told that the following should do:

$ brew install alure pkg-config
$ make
$ sudo ./buckle

Note that you need superuser privileges to create the event tap on Mac OS X.

Windows

I think the windows build is currently broken, it seems that switching from Freelut to Alure broke windows, I might fix this one day.

I suspect there is something wrong with alureCreateBufferFromFile() getting called from another thread in the key capture callback, but my knowledge of the win32 platform is so poor I'm not even able to run a debugger to see what is happening. Help from an expert is much appreciated.

Usage

usage: ./buckle [options]

options:

  -d DEVICE use OpenAL audio device DEVICE
  -g GAIN   set playback gain [0..100]
  -h        show help
  -l        list available openAL audio devices
  -m CODE   use CODE as mute key (default 0x46 for scroll lock)
  -p PATH   load .wav files from directory PATH
  -s WIDTH  set stereo width [0..100]
  -v        increase verbosity / debugging

OpenAL notes

Bucklespring uses the OpenAL library for mixing samples and providing a realistic 3D audio playback. This section contains some tips and tricks for properly tuning OpenAL for bucklespring.

• The default OpenAL settings can cause a slight delay in playback. Edit or create the OpenAL configuration file ~/.alsoftrc and add the following options:

period_size = 32
periods = 4

• If you are using headphones, enabling the head-related-transfer functions in OpenAL for a better 3D sound:

hrtf = true

• When starting an OpenAL application, the internal sound card is selected for output, and you might not be able to change the device using pavucontrol. The option to select an alternate device is present, but choosing the device has no effect. To solve this, add the following option to the OpenAL configuration file:

allow-moves = true