app.py

import gradio as gr
import subprocess
import os

def def process_audio(input_file, speed, reverb):
    if input_file is None:
        return None
    
    # Use an absolute path to avoid "File Not Found" errors
    output_path = os.path.abspath("remix.mp3")
    
    # Formula for professional atmosphere
    filter_complex = (
        f"asetrate=44100*{speed},aresample=44100,"
        f"freeverb=roomsize=0.85:damp=0.5:dry=1:wet={reverb}"
    )
    
    command = [
        'ffmpeg', '-y', '-i', input_file,
        '-filter_complex', filter_complex,
        output_path  # Save to absolute path
    ]
    
    # Execute the command and wait for it to finish completely
    result = subprocess.run(command, capture_output=True, text=True)
    
    # Debug: Check if FFmpeg actually created the file
    if os.path.exists(output_path):
        return output_path
    else:
        print(f"FFmpeg Error: {result.stderr}")
        return None(input_file, speed, reverb):
    if input_file is None:
        return None
    
    output_file = "remix.mp3"
    
    # High-quality Ambient Filter Chain
    # speed (0.7-1.0), reverb (0.0-1.0)
    filter_complex = (
        f"asetrate=44100*{speed},aresample=44100,"
        f"freeverb=roomsize=0.85:damp=0.5:dry=1:wet={reverb}"
    )
    
    command = [
        'ffmpeg', '-y', '-i', input_file,
        '-filter_complex', filter_complex,
        output_file
    ]
    
    subprocess.run(command)
    return output_file

# Create the Vibe Interface
with gr.Blocks(theme=gr.themes.Soft(primary_hue="purple", secondary_hue="indigo")) as demo:
    gr.Markdown("# 🌌 Ambient Slowed + Reverb")
    gr.Markdown("Upload a song to transform it into an atmospheric masterpiece.")
    
    with gr.Row():
        audio_in = gr.Audio(type="filepath", label="Upload Song")
        audio_out = gr.Audio(label="Download Remix")
        
    with gr.Row():
        speed_slider = gr.Slider(0.7, 1.0, value=0.88, label="Vibe (Speed/Pitch)")
        reverb_slider = gr.Slider(0.0, 0.8, value=0.4, label="Atmosphere (Reverb)")
        
    btn = gr.Button("Generate Remix", variant="primary")
    btn.click(process_audio, [audio_in, speed_slider, reverb_slider], audio_out)

demo.launch()