v4.3 fix: serve audio as base64 JSON (gunicorn Range fix), path-aware export, faster project load

routes/project_routes.py

@@ -222,7 +222,7 @@ def get_project(project_id):
 @project_bp.route('/api/projects/<int:project_id>/audio/<int:block_id>', methods=['GET'])
 @login_required
 def get_block_audio(project_id, block_id):
-    """Stream audio for a single block (v4.3: from file, with base64 fallback)."""
+    """Return audio as base64 JSON (v4.3: read from file, no send_file/Range)."""
     db = get_db()
     cursor = db.cursor()
     
@@ -237,21 +237,23 @@ def get_block_audio(project_id, block_id):
     if not row:
         return jsonify({'error': 'Block not found'}), 404
     
-    # নতুন: ফাইল থেকে সরাসরি stream (Range request সাপোর্ট সহ)
-    if row['audio_path']:
-        abs_path = get_safe_abs_path(row['audio_path'])
-        if abs_path and os.path.exists(abs_path):
-            return send_file(abs_path, mimetype=f"audio/{row['audio_format'] or 'mp3'}",
-                             conditional=True)
+    audio_format = clean_str(row['audio_format']) or 'mp3'
     
-    # পুরোনো: base64 JSON
+    # নতুন: ফাইল থেকে পড়ে base64 হিসেবে পাঠাই (gunicorn Range সমস্যা এড়াতে)
+    if row['audio_path']:
+        from media_storage import read_file_base64
+        b64 = read_file_base64(row['audio_path'])
+        if b64:
+            return jsonify({'audio_data': b64, 'audio_format': audio_format})
+    
+    # পুরোনো: DB-তে থাকা base64 (মাইগ্রেট না হওয়া)
     if row['audio_data']:
         return jsonify({
             'audio_data': clean_str(row['audio_data']),
-            'audio_format': clean_str(row['audio_format']) or 'mp3'
+            'audio_format': audio_format
         })
     
-    return jsonify({'audio_data': '', 'audio_format': row['audio_format'] or 'mp3'})
+    return jsonify({'audio_data': '', 'audio_format': audio_format})
 
 
 @project_bp.route('/api/projects/<int:project_id>', methods=['PUT'])