utils.py

import torchaudio
import os

def save_uploaded_audio(uploaded_file, save_path="converted_audio.wav"):
    try:
        # Save to a temp file
        temp_path = f"temp_{uploaded_file.name}"
        with open(temp_path, "wb") as f:
            f.write(uploaded_file.read())

        # Load with torchaudio
        waveform, sample_rate = torchaudio.load(temp_path)

        # Convert to 16kHz mono .wav (Whisper preferred)
        waveform = waveform.mean(dim=0).unsqueeze(0)
        torchaudio.save(save_path, waveform, 16000)
        
        # Clean up temp
        os.remove(temp_path)

        return save_path
    except Exception as e:
        print(f"[Error] Audio conversion failed: {e}")
        return None