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DSSI is an audio plugin API for soft synths and effects.
DSSI is an audio plugin API for software instruments (soft synths) and effects. It is based on the LADSPA plugin API, the ALSA sequencer event types, and OSC (Open Sound Control) communications with custom GUIs.
Play midi files via external midi devices or soft synth.
...All recent development has moved to https://github.com/nlaredo/playmidi
It supports software rendering of midi files via SDL audio and can also output midi events to external midi devices (in time with SDL audio soft synth) via both alsa sequencer api (linux) and coremidi api (osx).
Math-based synthesis (when no sf2 is loaded and no external midi output is set) is planned to evolve over time to support most of the features found in a minimoog voyager, and wavetable based sf2 support is expected to evolve to properly emulate all the features of a roland sc88 (but not there yet).
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LibSMF is a BSD-licensed C library for handling SMF ("*.mid") files. It transparently handles conversions between time and pulses, tempo map handling etc. The only dependencies are C compiler and glib. Full API documentation and examples are included.
Note that the development has moved to https://github.com/nilsgey/libsmf.