D1: LUFS EBU R128 + true peak sau render (app/core/loudness.py), API /plugins/render tra them lufs/true_peak_db, test 4 cases

app/api/v1/plugins.py

@@ -1181,7 +1181,20 @@ def render_project(
     output_path = os.path.join(settings.PROCESSED_DIR, safe_name)
     try:
         result_path = engine.render_project(req.project_json, output_path)
-        return {"url": f"/static/audio/processed/{os.path.basename(result_path)}", "path": result_path}
+        # EBU R128 loudness + true peak (D1) — trả kèm response để mastering
+        # panel hiển thị LUFS/dBTP ngay sau export mà không cần đọc lại file.
+        data, _sr = sf.read(result_path, dtype="float32", always_2d=True)
+        audio = data.T
+        from app.core import loudness
+        resp = {
+            "url": f"/static/audio/processed/{os.path.basename(result_path)}",
+            "path": result_path,
+        }
+        _lufs = loudness.integrated_lufs(audio, _sr)
+        _tp = loudness.true_peak_db(audio, _sr)
+        resp["lufs"] = round(_lufs, 2) if np.isfinite(_lufs) else None
+        resp["true_peak_db"] = round(_tp, 2) if np.isfinite(_tp) else None
+        return resp
     except Exception as e:
         raise HTTPException(status_code=500, detail=f"Render failed: {str(e)}")