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https://github.com/godotengine/godot
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105 lines
6.7 KiB
XML
105 lines
6.7 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="InputEventMIDI" inherits="InputEvent" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
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<brief_description>
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Represents a MIDI message from a MIDI device, such as a musical keyboard.
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</brief_description>
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<description>
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InputEventMIDI stores information about messages from [url=https://en.wikipedia.org/wiki/MIDI]MIDI[/url] (Musical Instrument Digital Interface) devices. These may include musical keyboards, synthesizers, and drum machines.
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MIDI messages can be received 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 is using.
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By default, Godot does not detect MIDI devices. You need to call [method OS.open_midi_inputs], first. You can check which devices are detected with [method OS.get_connected_midi_inputs], and close the connection with [method OS.close_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):
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print(midi_event)
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print("Channel ", midi_event.channel)
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print("Message ", midi_event.message)
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print("Pitch ", midi_event.pitch)
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print("Velocity ", midi_event.velocity)
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print("Instrument ", midi_event.instrument)
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print("Pressure ", midi_event.pressure)
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print("Controller number: ", midi_event.controller_number)
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print("Controller value: ", 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 inputEvent)
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{
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if (inputEvent 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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[b]Note:[/b] Godot does not support MIDI output, so there is no way to emit MIDI messages from Godot. Only MIDI input is supported.
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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 message, ranging from [code]0[/code] to [code]15[/code]. MIDI channel [code]9[/code] is reserved for 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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The unique number of the controller, if [member message] is [constant MIDI_MESSAGE_CONTROL_CHANGE], otherwise this is [code]0[/code]. This value can be used to identify sliders for volume, balance, and panning, as well as switches and pedals on the MIDI device. See the [url=https://en.wikipedia.org/wiki/General_MIDI#Controller_events]General MIDI specification[/url] for a small list.
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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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The value applied to the controller. If [member message] is [constant MIDI_MESSAGE_CONTROL_CHANGE], this value ranges from [code]0[/code] to [code]127[/code], otherwise it is [code]0[/code]. See also [member controller_value].
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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 (also called [i]program[/i] or [i]preset[/i]) used on this MIDI message. This value ranges from [code]0[/code] to [code]127[/code].
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To see what each value means, refer to the [url=https://en.wikipedia.org/wiki/General_MIDI#Program_change_events]General MIDI's instrument list[/url]. Keep in mind that the list is off by 1 because it does not begin from 0. A value of [code]0[/code] corresponds to the acoustic grand piano.
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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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Represents the type of MIDI message (see the [enum MIDIMessage] enum).
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For more information, see the [url=https://www.midi.org/specifications-old/item/table-2-expanded-messages-list-status-bytes]MIDI message status byte list chart[/url].
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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 message. This value ranges from [code]0[/code] to [code]127[/code].
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On a piano, the [b]middle C[/b] is [code]60[/code], followed by a [b]C-sharp[/b] ([code]61[/code]), then a [b]D[/b] ([code]62[/code]), and so on. Each octave is split in offsets of 12. See the "MIDI note number" column of the [url=https://en.wikipedia.org/wiki/Piano_key_frequencies]piano key frequency chart[/url] a full list.
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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 strength of the key being pressed. This value ranges from [code]0[/code] to [code]127[/code].
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[b]Note:[/b] For many devices, this value is always [code]0[/code]. Other devices such as musical keyboards may simulate pressure by changing the [member velocity], instead.
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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 message. This value ranges from [code]0[/code] to [code]127[/code]. For a musical keyboard, this corresponds to how quickly the key was pressed, and is rarely above [code]110[/code] in practice.
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[b]Note:[/b] Some MIDI devices may send a [constant MIDI_MESSAGE_NOTE_ON] message with [code]0[/code] velocity and expect it to be treated the same as a [constant MIDI_MESSAGE_NOTE_OFF] message. If necessary, this can be handled with a few lines of code:
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[codeblock]
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func _input(event):
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if event is InputEventMIDI:
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if event.message == MIDI_MESSAGE_NOTE_ON and event.velocity > 0:
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print("Note pressed!")
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[/codeblock]
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</member>
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</members>
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</class>
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