Yammer

Audio visualizer thing in guile scheme

Build

Dependencies

guile-sdl2, fftw

Compiling the library

You need to compile the yammer.c file because it has wrappers around fftw functions.

gcc -shared yammer.c -o libyammer.so -Wall -Wextra -Werror -fPIC -shared -lfftw3 -lm -O3 -ggdb

Configuration

Copy config.example.scm to config.scm

Below is a list of values and what they do

• fifo-file: The MPD fifo
• fps: Self explanatory
• resolution: Pixel width of bars
• scale: Bar height multiplier
• color: Bar color
• bgcolor: Background color
• queue-size: The size of the queue (minimum of 1), delays displaying bars by queue-size frames. Useful if desync is noticed
• fft: Whether or not to perform a fourier transform to show frequencies (like spectrum mode in most other visualizers)
• smoothing: Not implemented
• smoothing-factor: Not implemented

Running

Either install libyammer.so and yammer.h to their respective systemwide locations, or do the following:

export LD_LIBRARY_PATH=.

Then, run yammer.

guile -L . yammer.scm

Wishlist

• Native PulseAudio and PipeWire sources
• Smoothing
• Average over resolution
• Offload some calculations to the GPU

Known issues

• When MPD is paused or the program is sleeping for the next frame, the UI doesn't update so you can't exit
• The surface can't be transparent