The relevant Blueprint functions are Get Default MIDI Output Device ID, Find MIDI Devices, and Get MIDI Output Device ID by Name.Ĭreate your MIDI Output UObject using the Blueprint function, Create MIDIDevice Output Controller. Searching for a specific MIDI device by name. Iterating through all available MIDI devices
To get MIDI Output functioning in Unreal Engine 4, follow the workflow described below:įind the ID of the device you want to send the MIDI signal to. While Unreal does not directly translate MIDI data this way, which potentially allows users to use MIDI messages to drive behavior other than audio, our Sound Utilities plugin includes several functions that can be used to perform MIDI data conversions.
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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.