rtmidi

by thestk

thestk / rtmidi

A set of C++ classes that provide a common API for realtime MIDI input/output across Linux (ALSA & J...

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RtMidi

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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, 2003-2019.

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
tests/
directory.

If you checked out the code from git, please run

./autogen.sh
before
./configure
.

Overview

RtMidi is a set of C++ classes (

RtMidiIn
,
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,

RtMidiIn
and
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
std::vector
.

Windows

In some cases, for example to use RtMidi with GS Synth, it may be necessary for your program to call

CoInitializeEx
and
CoUninitialize
on entry to and exit from the thread that uses RtMidi.

Further reading

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.

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