New port: audio/sonic-visualiser

Sonic Visualiser is a program for viewing and analysing the contents
of music audio files.

It supports serveral audio file formats and displays their waveforms
and spectograms in a straightforward way. The audio data can be
annotated and played back featuring time streching. Furthermore it
can be extended by third-party vamp plugins for feature extraction.

WWW: http://www.sonicvisualiser.org/

PR: 208401
Submitted by: uddka@student.kit.edu
Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D9788