$ pysdr-waterfall -h
usage: pysdr-waterfall [-h] [-b BINS] [-H HEIGHT] [-o OVERLAP] [-j NAME]
                       [-r RATE] [-d ARGS] [-p FILENAME]

Plot live spectral waterfall of a quadrature signal.

optional arguments:
  -h, --help            show this help message and exit
  -b BINS, --bins BINS  number of FFT bins (default: 4096)
  -H HEIGHT, --height HEIGHT
                        minimal height of the waterfall in seconds
                        (default corresponds to 1024 windows)
  -o OVERLAP, --overlap OVERLAP
                        overlap between consecutive windows as a
                        proportion of the number of bins (default: 0.75)
  -j NAME, --jack NAME  feed signal from JACK and use the given client
                        name (by default, with name 'pysdr')
  -r RATE, --raw RATE   feed signal from the standard input, expects 2
                        channel interleaved floats with the given sample-
                        rate
  -d ARGS, --detector ARGS
                        attach the given detector script, expects to be
                        given the script filename followed by arguments
                        for the script, all joined by spaces and passed on
                        the command-line as one quoted argument
  -p FILENAME, --persfn FILENAME
                        a file in which to preserve the visualization
                        parameters that come from interactive
                        manipulation, i.e. the visible area of the
                        waterfall and the selected magnitude range (save
                        triggered by pressing 'p')

$ sox -d -e floating-point -b 32 -r 48000 -t raw --buffer 1024 - | ./pysdr-waterfall -r 48000

$ arecord -f FLOAT_LE -c 2 -r 44100 --buffer-size 1024 | pysdr-waterfall -r 44100

$ pysdr-recviewer path/to/recording

$ sudo apt-get install python-numpy python-opengl python-dev libjack-jackd2-dev python-pil

$ python setup.py build_ext --inplace

$ python setup.py install