pkgsrc/audio/portaudio/DESCR

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PortAudio is a free, cross-platform, open-source, audio I/O library. It
lets you write simple audio programs in C or C++ that will compile and run
on many platforms including Windows, Macintosh OS X, and Unix (OSS/ALSA).
It is intended to promote the exchange of audio software between developers
on different platforms.
PortAudio provides a very simple API for recording and/or playing sound
using a simple callback function or a blocking read/write interface.