catfact/wavespecter

small command-line utility to make spectrum plot thumbnails from audio files.

WaveSpecter

this is a small command-line utility to make spectrum plot thumbnails from audio files.

it is written in C++, uses JUCE for build framework, audio reading, and image writing, uses kiss_fft for FFT.

tested on macos only at the moment.

usage

./wavespecter input [output] [frequency scale] [height]

in the absence of an output filename, .png will be appended to the input filename.

oh yeah - the output is always .png, doesn't matter what extension you put. (ha!)

frequency scale is logarithmic by default. enterlin in the 3rd argument to use a linear scale instead. anything but lin results in log-scale output. (and it's case sensitive. ha!)

the size of the DFT window is the number of samples in the input file, rounded up to the nearest even number.

the output image width is fixed at one pixel per frequency bin. so width = (samples rounded up ) / 2 + 1.

output image height can be specified as a fourth argument (integer number of pixels, defaults to 80.)

plot characteristics

• amplitudes are plotted on a decibel scale with a -90dB floor.
• frequency range from DC - Nyquist. for log scaling, the first non-zero entry is the same as for the linear scale (nyquist / num bands,) and the zero entry is still zero.

wavespecter's Issues

Windows binary

Dear @catfact, could you be so kind to compile this tool for Windows 7 x64 users like me?