midi_keyboard.py

import mido
from pynput import keyboard
from pynput.keyboard import Controller
import time


# Create a Keyboard controller
midi_keyboard = Controller()

# Create a dictionary to map MIDI notes to keyboard keys
midi_to_key = {
    48: "z",  # C3
    49: "s",  # C#3/D♭3
    50: "x",  # D3
    51: "d",  # D#3/E♭3
    52: "c",  # E3
    53: "v",  # F3
    54: "g",  # F#3/G♭3
    55: "b",  # G3
    56: "h",  # G#3/A♭3
    57: "n",  # A3
    58: "j",  # A#3/B♭3
    59: "m",  # B3
    60: "q",  # C4
    61: "2",  # C#4/D♭4
    62: "w",  # D4
    63: "3",  # D#4/E♭4
    64: "e",  # E4
    65: "r",  # F4
    66: "5",  # F#4/G♭4
    67: "t",  # G4
    68: "6",  # G#4/A♭4
    69: "y",  # A4
    70: "7",  # A#4/B♭4
    71: "u",  # B4
}

# Flag to control the main loop
running = True


def on_press(key):
    global running
    if key == keyboard.Key.esc:
        print("\nExit key pressed. Stopping MIDI conversion...")
        running = False
        return False  # Stop the listener


# Function to run the MIDI input processing
def process_midi():
    # Get a list of all MIDI input names
    input_names = mido.get_input_names()

    # Check if there are any MIDI inputs
    if not input_names:
        print("No MIDI inputs found")
        return

    console_message = (
        "\n********************************************\n"
        "MIDI conversion is running...\n"
        f"MIDI input: {input_names[0]}\n"
        "To exit: press [Esc]\n"
        "********************************************"
    )

    print(console_message)

    # Open the first MIDI input
    with mido.open_input(input_names[0]) as inport:
        while running:
            # Check for MIDI messages
            for msg in inport.iter_pending():
                # If this is a note_on message with a velocity > 0 and the note is in our dictionary...
                if (
                    msg.type == "note_on"
                    and msg.velocity > 0
                    and msg.note in midi_to_key
                ):
                    # Trigger the equivalent keyboard key press
                    midi_keyboard.press(midi_to_key[msg.note])
                # If this is a note_off message or a note_on message with a velocity of zero and the note is in our dictionary...
                elif (
                    msg.type == "note_off"
                    or (msg.type == "note_on" and msg.velocity == 0)
                ) and msg.note in midi_to_key:
                    # Release the equivalent keyboard key
                    midi_keyboard.release(midi_to_key[msg.note])

            # Sleep to avoid high CPU usage
            time.sleep(0.01)


def main():

    # Start the keyboard listener in a separate thread
    listener = keyboard.Listener(on_press=on_press)
    listener.start()

    # Run the MIDI processing in the main thread
    process_midi()

    print("MIDI conversion stopped.")


if __name__ == "__main__":
    main()