app.py

import gradio as gr
from pydub import AudioSegment
import os

# --- DEBUG: LIST ALL FILES ---
print("\n🔍 DIAGNOSTIC: Here are the exact file names in your folder:")
files = os.listdir(".")
for f in files:
    if f.endswith((".mp3", ".wav")):
        print(f"   🎵 {f}")
print("------------------------------------------------\n")

# --- 1. SETUP & FILE CHECK ---
print("Attempting to load stems...")

def load_smart_stem(name):
    # Check for MP3
    if os.path.exists(f"{name}.mp3"):
        print(f"✅ Found {name}.mp3")
        return AudioSegment.from_file(f"{name}.mp3")
    # Check for WAV
    elif os.path.exists(f"{name}.wav"):
        print(f"✅ Found {name}.wav")
        return AudioSegment.from_file(f"{name}.wav")
    # If neither exists
    else:
        print(f"❌ MISSING: {name}.mp3 OR {name}.wav")
        return AudioSegment.silent(duration=1000) 

# Load the files
vocals = load_smart_stem("vocals")
drums = load_smart_stem("drums")
bass = load_smart_stem("bass")
other = load_smart_stem("other")

# --- 2. THE MIXING FUNCTION ---
def remix_track(voc_vol, drum_vol, bass_vol, other_vol, speed):
    v = vocals + voc_vol
    d = drums + drum_vol
    b = bass + bass_vol
    o = other + other_vol
    
    mix = v.overlay(d).overlay(b).overlay(o)
    
    if speed != 1.0:
        new_sample_rate = int(mix.frame_rate * speed)
        mix = mix._spawn(mix.raw_data, overrides={'frame_rate': new_sample_rate})
        mix = mix.set_frame_rate(44100)

    output_path = "remix.mp3"
    mix.export(output_path, format="mp3")
    return output_path

# --- 3. THE INTERFACE ---
with gr.Blocks(theme=gr.themes.Soft()) as demo:
    gr.Markdown("# 🚪 OPEN DOORS | REMIX STATION")
    
    with gr.Row():
        v_slide = gr.Slider(-60, 10, value=0, label="Vocals (dB)")
        d_slide = gr.Slider(-60, 10, value=0, label="Drums (dB)")
        b_slide = gr.Slider(-60, 10, value=0, label="Bass (dB)")
        o_slide = gr.Slider(-60, 10, value=0, label="Melody (dB)")
    
    with gr.Row():
        speed_slide = gr.Slider(0.5, 1.5, value=1.0, label="Speed & Pitch")
    
    btn = gr.Button("Generate Remix", variant="primary")
    audio_out = gr.Audio(label="Your Remix")

    btn.click(fn=remix_track, 
              inputs=[v_slide, d_slide, b_slide, o_slide, speed_slide], 
              outputs=audio_out)

demo.launch()