This is a simple application I hacked together while testing USB Audio Interfaces.
It takes a wav file, runs an FFT (using FFTW), plots the output (using gnuplot), just some simple checks for glitches (expects sine waves)
- Gnuplot for generating plots
- libsndfie (Version used 1.0.25) - http://www.mega-nerd.com/libsndfile/#Download
- (I came accross this issue when building from source: https://trac.macports.org/ticket/35358)
- fftw3 (build from source or use macports)
Something like the following should do it..
gcc -lfftw3 sndfile2fft.c -lsndfile -std=gnu99 -o sndfile2fft
(A simple makefile is included)
sndfile2fft [-p]
Where the output file will contain a line for each freq bin. First column freq value, then column for each channel.
Adding the optional -p on the end will cause it to draw a plot with gnuplot.
Only tested on OSX and a few recorded wav files (some with injected errors).
- Only for stereo really
- Could do with command line options for the various options
- Needs tidy up - Very hacky!
- Check detected peaks dont move