98 lines
6.4 KiB
XML
98 lines
6.4 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="InputEventMIDI" inherits="InputEvent" version="4.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
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<brief_description>
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Represents an input event from a MIDI device, such as a piano.
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</brief_description>
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<description>
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InputEventMIDI allows receiving input events from MIDI (Musical Instrument Digital Interface) devices such as a piano.
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MIDI signals can be sent over a 5-pin MIDI connector or over USB, if your device supports both be sure to check the settings in the device to see which output it's using.
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To receive input events from MIDI devices, you need to call [method OS.open_midi_inputs]. You can check which devices are detected using [method OS.get_connected_midi_inputs].
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[codeblocks]
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[gdscript]
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func _ready():
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OS.open_midi_inputs()
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print(OS.get_connected_midi_inputs())
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func _input(input_event):
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if input_event is InputEventMIDI:
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_print_midi_info(input_event)
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func _print_midi_info(midi_event: InputEventMIDI):
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print(midi_event)
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print("Channel " + str(midi_event.channel))
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print("Message " + str(midi_event.message))
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print("Pitch " + str(midi_event.pitch))
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print("Velocity " + str(midi_event.velocity))
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print("Instrument " + str(midi_event.instrument))
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print("Pressure " + str(midi_event.pressure))
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print("Controller number: " + str(midi_event.controller_number))
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print("Controller value: " + str(midi_event.controller_value))
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[/gdscript]
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[csharp]
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public override void _Ready()
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{
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OS.OpenMidiInputs();
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GD.Print(OS.GetConnectedMidiInputs());
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}
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public override void _Input(InputEvent @event)
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{
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if (@event is InputEventMIDI midiEvent)
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{
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PrintMIDIInfo(midiEvent);
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}
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}
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private void PrintMIDIInfo(InputEventMIDI midiEvent)
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{
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GD.Print(midiEvent);
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GD.Print($"Channel {midiEvent.Channel}");
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GD.Print($"Message {midiEvent.Message}");
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GD.Print($"Pitch {midiEvent.Pitch}");
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GD.Print($"Velocity {midiEvent.Velocity}");
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GD.Print($"Instrument {midiEvent.Instrument}");
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GD.Print($"Pressure {midiEvent.Pressure}");
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GD.Print($"Controller number: {midiEvent.ControllerNumber}");
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GD.Print($"Controller value: {midiEvent.ControllerValue}");
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}
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[/csharp]
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[/codeblocks]
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Note that Godot does not currently support MIDI output, so there is no way to emit MIDI signals from Godot. Only MIDI input works.
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</description>
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<tutorials>
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<link title="MIDI Message Status Byte List">https://www.midi.org/specifications-old/item/table-2-expanded-messages-list-status-bytes</link>
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<link title="Wikipedia General MIDI Instrument List">https://en.wikipedia.org/wiki/General_MIDI#Program_change_events</link>
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<link title="Wikipedia Piano Key Frequencies List">https://en.wikipedia.org/wiki/Piano_key_frequencies#List</link>
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</tutorials>
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<members>
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<member name="channel" type="int" setter="set_channel" getter="get_channel" default="0">
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The MIDI channel of this input event. There are 16 channels, so this value ranges from 0 to 15. MIDI channel 9 is reserved for the use with percussion instruments, the rest of the channels are for non-percussion instruments.
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</member>
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<member name="controller_number" type="int" setter="set_controller_number" getter="get_controller_number" default="0">
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If the message is [constant MIDI_MESSAGE_CONTROL_CHANGE], this indicates the controller number, otherwise this is zero. Controllers include devices such as pedals and levers.
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</member>
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<member name="controller_value" type="int" setter="set_controller_value" getter="get_controller_value" default="0">
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If the message is [constant MIDI_MESSAGE_CONTROL_CHANGE], this indicates the controller value, otherwise this is zero. Controllers include devices such as pedals and levers.
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</member>
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<member name="instrument" type="int" setter="set_instrument" getter="get_instrument" default="0">
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The instrument of this input event. This value ranges from 0 to 127. Refer to the instrument list on the General MIDI wikipedia article to see a list of instruments, except that this value is 0-index, so subtract one from every number on that chart. A standard piano will have an instrument number of 0.
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</member>
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<member name="message" type="int" setter="set_message" getter="get_message" enum="MIDIMessage" default="0">
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Returns a value indicating the type of message for this MIDI signal. This is a member of the [enum MIDIMessage] enum.
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For MIDI messages between 0x80 and 0xEF, only the left half of the bits are returned as this value, as the other part is the channel (ex: 0x94 becomes 0x9). For MIDI messages from 0xF0 to 0xFF, the value is returned as-is.
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Notes will return [constant MIDI_MESSAGE_NOTE_ON] when activated, but they might not always return [constant MIDI_MESSAGE_NOTE_OFF] when deactivated, therefore your code should treat the input as stopped if some period of time has passed.
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Some MIDI devices may send [constant MIDI_MESSAGE_NOTE_ON] with zero velocity instead of [constant MIDI_MESSAGE_NOTE_OFF].
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For more information, see the note in [member velocity] and the MIDI message status byte list chart linked above.
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</member>
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<member name="pitch" type="int" setter="set_pitch" getter="get_pitch" default="0">
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The pitch index number of this MIDI signal. This value ranges from 0 to 127. On a piano, middle C is 60, and A440 is 69, see the "MIDI note" column of the piano key frequency chart on Wikipedia for more information.
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</member>
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<member name="pressure" type="int" setter="set_pressure" getter="get_pressure" default="0">
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The pressure of the MIDI signal. This value ranges from 0 to 127. For many devices, this value is always zero.
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</member>
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<member name="velocity" type="int" setter="set_velocity" getter="get_velocity" default="0">
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The velocity of the MIDI signal. This value ranges from 0 to 127. For a piano, this corresponds to how quickly the key was pressed, and is rarely above about 110 in practice.
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[b]Note:[/b] Some MIDI devices may send a [constant MIDI_MESSAGE_NOTE_ON] message with zero velocity and expect this to be treated the same as a [constant MIDI_MESSAGE_NOTE_OFF] message, but device implementations vary so Godot reports event data exactly as received. Depending on the hardware and the needs of the game/app, this MIDI quirk can be handled robustly with a couple lines of script (check for [constant MIDI_MESSAGE_NOTE_ON] with velocity zero).
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</member>
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</members>
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</class>
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