app.py

import numpy as np
import gradio as gr

# Define notes and their corresponding MIDI number
notes = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"]

def generate_tone(note, octave, duration):
    sr = 48000  # Sample rate
    a4_freq = 440  # Frequency of A4
    # Calculate the frequency of the note
    tones_from_a4 = 12 * (octave - 4) + (note - 9)  # Adjusted note to MIDI
    frequency = a4_freq * 2 ** (tones_from_a4 / 12)

    # Generate the time array
    t = np.linspace(0, duration, int(duration * sr), endpoint=False)
    # Create the sine wave
    audio = (0.5 * np.sin(2 * np.pi * frequency * t)).astype(np.float32)
    # Convert to 16-bit PCM format (scale to 16-bit range)
    audio = (audio * 32767).astype(np.int16)
    
    return (sr, audio)

# Gradio interface
gr.Interface(
    generate_tone,
    [
        gr.Dropdown(choices=notes, label="Note", type="index"),
        gr.Slider(minimum=4, maximum=6, step=1, label="Octave"),
        gr.Number(value=1, label="Duration in seconds"),
    ],
    "audio",
).launch()