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51 lines
4.5 KiB
XML
51 lines
4.5 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="InputEventMIDI" inherits="InputEvent" version="4.1">
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<brief_description>
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Input event for MIDI inputs.
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</brief_description>
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<description>
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InputEventMIDI allows receiving input events from MIDI devices such as a piano. MIDI stands for Musical Instrument Digital Interface.
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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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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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<methods>
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</methods>
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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 [code]MIDI_MESSAGE_CONTROL_CHANGE[/code], 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 [code]MIDI_MESSAGE_CONTROL_CHANGE[/code], 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" 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 @GlobalScope.MidiMessageList] 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 [code]MIDI_MESSAGE_NOTE_ON[/code] when activated, but they might not always return [code]MIDI_MESSAGE_NOTE_OFF[/code] when deactivated, therefore your code should treat the input as stopped if some period of time has passed.
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For more information, see 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. Note that 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.
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</member>
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</members>
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<constants>
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</constants>
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</class>
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