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Renderfall

Inspired by the excellent baudline and gr-fosphor, renderfall seeks to render beautiful and informative spectrographs of audio, RF samples, and any other data you care to throw at it.

The goal is to be able to render poster-scale visualizations of large (hundreds of GB) input samples, so it places a large emphasis on performance, and avoids loading the entire input stream into memory.

Features:

  • Basically None

Known Bugs:

  • So Many

Installation

$ mkdir build
$ cmake ..
$ make
$ make install

Basic Usage

See renderfall -h for options:

$ renderfall -h
Usage: renderfall [OPTIONS] <in>
Render a waterfall spectrum from raw IQ samples.

Options:
  -n, --fftsize <fftsize>	FFT size (power of 2)
  -f, --format  <format>	Input format: uint8, int16, float64, etc.
  -w, --window  <window>	Windowing function: hann, gaussian, square, blackmanharris, hamming, kaiser, parzen
  -o, --outfile <outfile>	Output file path (defaults to <infile>.png)
  -s, --offset  <offset>	Start at specified byte offset
  -l, --overlap <overlap>	Overlap N samples per frame (defaults to 0)
  -c, --clip <clip>	Read only the first N samples from the file
  -v, --verbose 		Print verbose debugging output

Here's an example using a .cf32 file of complex 32-bit floats:

$ renderfall -f float32 -n 2048 -w hann data.cf32

Currently, only raw sequential samples are supported. To use a .wav file, you can strip the header, and use the int16 input format.

Gallery

FM Band, from 87.9MHz to 107.9MHz, with a Hann window

A MURS Radio

Stay tuned, more coming soon...