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A set of C++ classes that provide a common API for realtime MIDI input/output across Linux (ALSA & JACK), Macintosh OS X (CoreMIDI & JACK) and Windows (Multimedia).
By Gary P. Scavone, 2003-2021.
This distribution of RtMidi contains the following:
doc: RtMidi documentation (also online at http://www.music.mcgill.ca/~gary/rtmidi/)
tests: example RtMidi programs
On Unix systems, type
./configure in the top level directory, then
make in the
tests/ directory to compile the test programs. In Windows, open the Visual C++ workspace file located in the
If you checked out the code from git, please run
RtMidi is a set of C++ classes (
RtMidiOut, and API specific classes) that provide a common API (Application Programming Interface) for realtime MIDI input/output across Linux (ALSA, JACK), Macintosh OS X (CoreMIDI, JACK), and Windows (Multimedia Library) operating systems. RtMidi significantly simplifies the process of interacting with computer MIDI hardware and software. It was designed with the following goals:
- object oriented C++ design
- simple, common API across all supported platforms
- only one header and one source file for easy inclusion in programming projects
- MIDI device enumeration
MIDI input and output functionality are separated into two classes,
RtMidiOut. Each class instance supports only a single MIDI connection. RtMidi does not provide timing functionality (i.e., output messages are sent immediately). Input messages are timestamped with delta times in seconds (via a
double floating point type). MIDI data is passed to the user as raw bytes using an
In some cases, for example to use RtMidi with GS Synth, it may be necessary for your program to call
CoUninitialize on entry to and exit from the thread that uses RtMidi.
For complete documentation on RtMidi, see the
doc directory of the distribution or surf to http://www.music.mcgill.ca/~gary/rtmidi/.
Legal and ethical
The RtMidi license is similar to the MIT License, with the added feature that modifications be sent to the developer. Please see LICENSE.