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A public domain example of how to use portaudio or SDL2 to output mixed audio from .ogg and .wav files. Usable in a game for example where you have control over what files to play.
...Additional tools record audio, play captured samples, detect individual keystrokes, and display waveforms for inspection. The project supports Linux, FreeBSD, macOS, and Windows through CMake, SDL2, and optional FFTW3 components. It is intended for acoustic security research and authorized vulnerability testing.