The MIDI protocol also specifies how to interpret bytes of data, such as how to translate a pitch value of 0 to 127 into a unit such as Hz. Because the most significant bit of each data byte is used to signify that it is a data byte, both the pitch and velocity data can only contain a value between 0 and 127. A MIDI message starts with a byte containing the type of message it is (a "status" byte), followed by data bytes.įor example, one of the most common MIDI messages is a Note On message, which consists of a status byte that both signifies it as a Note On message and communicates the channel it is intended for (a value from 0 - 15), followed by a byte of pitch data, and then a byte of velocity data. MIDI is a data protocol designed for communicating between different audio hardware devices, using MIDI messages. However, because MIDI is a data protocol, a user can use data parsed from messages to drive non-audio related parameters, as well.Ĭurrently, Unreal only supports streamed MIDI data.
This is most frequently used to communicate between Unreal Engine and external hardware such as MIDI keyboards. The MIDI Device Support plugin adds the ability to send and receive MIDI (Musical Instrument Digital Interface) protocol messages.
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