bq*

Modest C++ libraries for audio tasks

These libraries provide C++ wrappers for things useful in audio applications, such as FFTs, resamplers, and audio I/O. Most of them wrap more than one alternative implementation, selectable at compile time. They are intended to be vendored in to a project, not packaged separately.

These are fairly long-standing libraries already in use in multiple applications, and they are conservative about the C++ style used (all but bqaudioio are still C++98). They are all licensed under permissive BSD/MIT-style terms and may be used at no cost in proprietary or open-source applications.

bqvec – Vector-of-float management and arithmetic using raw C pointer arrays, designed for simple audio buffer-shuffling. Also includes aligned malloc wrappers and a lock-free ring buffer.
bqfft – Fast Fourier Transforms for some common audio processing use cases. Provides real-to-complex FFTs only, not a general FFT API. Contains a built-in FFT implementation, plus wrappers for FFTW3, KissFFT, Intel IPP, and Apple vDSP.
bqresample – Audio sample rate conversion. Contains a high-quality built-in resampler, plus wrappers for libsamplerate and the Speex resampler.
bqaudiostream – Audio file reading and writing. Covers CoreAudio (on Mac), MediaFoundation (on Windows), libsndfile, Ogg/Vorbis, Opus, and MiniMP3.
bqaudioio – Audio recording and playback. Covers PortAudio, PulseAudio, and JACK. Includes a sample-rate-converting adapter.