The Audio Processing Framework (APF) is a collection of C++ code which was written in the context of multichannel audio applications. However, many modules have a more generic scope.

This documentation: https://AudioProcessingFramework.github.io/

Development pages: https://github.com/AudioProcessingFramework/apf/

Blog: http://spatialaudio.net/

Components:

Multithreaded Multichannel Audio Processing Framework: MimoProcessor
C++ wrapper for the JACK Audio Connection Kit (http://jackaudio.org/): apf::JackClient
Convolution engine using (uniformly) partitioned convolution: apf::conv
IIR second order filter (and cascade of filters): apf::BiQuad and apf::Cascade
Block-based delay line: apf::BlockDelayLine and its slightly awkward cousin apf::NonCausalBlockDelayLine
Several Iterators and Iterator macros
Some simple containers: apf::fixed_vector, apf::fixed_list, apf::fixed_matrix
Several different methods to prevent denormals: apf::dp
Some mathematical functions: apf::math
Functions for string manipulation (and conversion): apf::str
Parameter map with a few conversion functions: apf::parameter_map
Some tools for using the FFTW library: fftwtools.h
Macros and helper functions for creating MEX files: mextools.h
Simple stopwatch: apf::StopWatch
Miscellaneous stuff: misc.h

Copyright: Copyright (c) 2012-2016 Institut für Nachrichtentechnik, Universität Rostock; Copyright (c) 2006-2012 Quality & Usability Lab, Deutsche Telekom Laboratories, TU Berlin; All code and documentation is available under the MIT license.