app.py

import gradio as gr

# HTML and JavaScript for the MidiVisualizer
visualizer_html = """
<midi-visualizer></midi-visualizer>
<div id="midi_visualizer_container" style="width: 100%;"></div>
<audio id="midi_audio" controls></audio>

<script>
    // Insert the provided JavaScript code here
</script>
"""

def process_midi(midi_file):
    # Process the MIDI file and return the visualization and audio
    midi_data = midi_file.read()
    # You would need to implement the actual MIDI parsing and event extraction logic here.
    # For the sake of example, let's assume we generate MIDI events and an audio file.
    midi_events = extract_midi_events(midi_data)
    audio_file = generate_audio_from_midi(midi_data)
    
    # Send MIDI events to the visualizer via messages
    for event in midi_events:
        gr.send_message("visualizer_append", {"data": event})
    gr.send_message("visualizer_end")
    
    return visualizer_html, audio_file

def extract_midi_events(midi_data):
    # Dummy implementation to extract MIDI events from midi_data
    # Replace this with actual MIDI parsing logic
    return [
        ["note", 0, 1, 1, 0, 60, 127],
        ["note", 1, 1, 1, 0, 64, 127],
        ["note", 2, 1, 1, 0, 67, 127],
    ]

def generate_audio_from_midi(midi_data):
    # Dummy implementation to generate an audio file from midi_data
    # Replace this with actual audio generation logic
    return "path/to/generated/audio/file.mp3"

# Gradio UI
with gr.Blocks() as demo:
    with gr.Row():
        gr.Markdown("# MIDI Visualizer")
    with gr.Row():
        midi_input = gr.File(label="Upload MIDI File")
    with gr.Row():
        output_html = gr.HTML()
        audio_output = gr.Audio()
    
    midi_input.change(process_midi, inputs=midi_input, outputs=[output_html, audio_output])

demo.launch()