Create audio_tuner.py

audio_tuner.py

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+# audio_tuner.py
+
+from pydub import AudioSegment
+
+def change_audio_tuning(audio_filepath, initial_tuning_hz, desired_tuning_hz):
+    """
+    Changes the speed of an audio file to match a desired tuning.
+
+    This function adjusts the playback speed of the audio, which in turn
+    changes its pitch, to move from an initial tuning to a desired tuning.
+
+    Args:
+        audio_filepath (str): Path to the input audio file.
+        initial_tuning_hz (float): The initial tuning frequency in Hz (e.g., 440).
+        desired_tuning_hz (float): The desired tuning frequency in Hz (e.g., 432).
+
+    Returns:
+        (int, numpy.ndarray): A tuple containing the new sample rate and the
+                                  audio data as a NumPy array for Gradio compatibility.
+    """
+    # --- Input Validation ---
+    if not audio_filepath:
+        raise ValueError("No audio file provided.")
+    if not initial_tuning_hz or not desired_tuning_hz:
+        raise ValueError("Initial and desired tuning frequencies must be provided.")
+    if initial_tuning_hz <= 0 or desired_tuning_hz <= 0:
+        raise ValueError("Tuning frequencies must be positive values.")
+
+    # --- Processing ---
+    # Calculate the speed multiplier required to change the pitch
+    speed_multiplier = desired_tuning_hz / initial_tuning_hz
+
+    # Load the audio file using pydub
+    sound = AudioSegment.from_file(audio_filepath)
+
+    # A simple way to change speed without pitch correction is to change the frame rate
+    new_frame_rate = int(sound.frame_rate * speed_multiplier)
+
+    # Create a new audio segment with the modified frame rate
+    tuned_sound = sound._spawn(sound.raw_data, overrides={"frame_rate": new_frame_rate})
+    
+    # Set the frame rate back to the original to ensure proper playback speed in most players,
+    # effectively resampling the audio.
+    tuned_sound = tuned_sound.set_frame_rate(sound.frame_rate)
+
+    # --- Output for Gradio ---
+    # Gradio audio component expects a tuple of (sample_rate, numpy_array)
+    # The sample rate is the original rate after resampling.
+    # The audio data is converted to a NumPy array.
+    import numpy as np
+    samples = np.array(tuned_sound.get_array_of_samples()).astype(np.int16)
+    
+    return (tuned_sound.frame_rate, samples)