Create app.py

app.py

@@ -0,0 +1,76 @@
+from flask import Flask, request, send_file, jsonify
+from pydub import AudioSegment, effects
+import numpy as np
+import requests
+import io
+
+app = Flask(__name__)
+
+@app.route("/result")
+def process_song():
+    url = request.args.get("song")
+    if not url:
+        return jsonify({"error": "Please provide a song link with ?song=<url>"}), 400
+
+    try:
+        # Download audio file
+        resp = requests.get(url, stream=True)
+        resp.raise_for_status()
+
+        # Load audio into pydub
+        sound = AudioSegment.from_file(io.BytesIO(resp.content), format="mp3")
+        sound = effects.normalize(sound)
+
+        # Split channels
+        channels = sound.split_to_mono()
+        left, right = channels[0], channels[1]
+
+        # Empty output
+        output = AudioSegment.silent(duration=len(sound), frame_rate=sound.frame_rate)
+
+        # Settings
+        chunk_ms = 10
+        pan_period = 6.0
+        base_depth = 0.7
+        depth_variation = 0.2
+        reverb_delay = 80
+
+        steps = len(sound) // chunk_ms
+        for i in range(steps):
+            t = (i * chunk_ms) / 1000.0
+            ratio = (np.sin(2 * np.pi * t / pan_period) + 1) / 2
+            depth = base_depth + depth_variation * np.sin(2 * np.pi * t / (pan_period * 2))
+
+            left_gain = (1 - depth * ratio) * -3
+            right_gain = (depth * ratio) * -3
+
+            left_chunk = left[i * chunk_ms:(i + 1) * chunk_ms] + left_gain
+            right_chunk = right[i * chunk_ms:(i + 1) * chunk_ms] + right_gain
+
+            stereo_chunk = AudioSegment.from_mono_audiosegments(left_chunk, right_chunk)
+            output += stereo_chunk
+
+        # --- Stereo widening ---
+        widened = output.overlay(output.pan(-0.5), gain_during_overlay=-6)
+        widened = widened.overlay(output.pan(0.5), gain_during_overlay=-6)
+
+        # --- Subtle reverb ---
+        reverb = widened.overlay(widened - 8, delay=reverb_delay)
+        reverb = reverb.overlay(widened - 14, delay=reverb_delay * 2)
+
+        # --- Final mastering ---
+        final = effects.normalize(reverb)
+
+        # Export to memory
+        buf = io.BytesIO()
+        final.export(buf, format="mp3")
+        buf.seek(0)
+
+        return send_file(buf, mimetype="audio/mpeg", as_attachment=True, download_name="panned_heavenly.mp3")
+
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=7860)