BTW, Vamp has an SDK, so it should be suited to your needs. See here:
 
 On Wed, Oct 16, 2019 at 7:58 PM Louigi Verona <louigi.verona(a)gmail.com>
 wrote:
  Plugins are good, but I am more interested in
libraries that people can
 use for their projects.
 bpm-tools look like what I mean, but they are so old: last release was in
 2013. Are there any other open source libraries people use?
 Louigi Verona
 
https://louigiverona.com/
 On Mon, Oct 14, 2019 at 3:06 PM Robin Gareus <robin(a)gareus.org> wrote:
  On 10/14/19 10:36 AM, Louigi Verona wrote:
  Hey everyone!
 What are the bpm and key detection libraries people use for open source
 projects? And how good are they? 
 https://vamp-plugins.org/download.html are amazing.
 You can test for yourself using sonic-visualizer.
 Cheers!
 robin
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