G3: 1 clock - PDC latency that + playhead engine-derived

app/core/fx_realtime.py

@@ -128,6 +128,7 @@ class FxRealtimeSession:
         # Phase 2.8: C++ consume qua SHM control ring.
         self.pending_params = {}   # {slot_idx: {key: value}}
         self.latencies = {}        # {slot_idx: samples}
+        self.processed = None      # G3: processed samples tu bridge (lat slot 0xFFFFFFFE)
         # Diagnostics (FXRT crackle hunt): drop/publish counters.
         self.stats = {'publish': 0, 'drop_batch': 0, 'drop_blocks': 0,
                       'stale_flush': 0, 'read_blocks': 0, 'read_empty': 0,
@@ -396,6 +397,12 @@ class FxRealtimeSession:
             self._lat_drain()
             return dict(self.latencies)
 
+    def get_processed(self):
+        """G3: processed samples (bridge da xu li) - playhead engine-derived."""
+        with self._lock:
+            self._lat_drain()
+            return self.processed
+
     def _lat_drain(self):
         shm = getattr(self, "shm", None)
         if shm is None:
@@ -405,12 +412,17 @@ class FxRealtimeSession:
             lats = (FxLatReport * FXRT_LAT_SLOTS).from_buffer(shm.buf, LAT_OFF)
             while h.lat_read < h.lat_write:
                 ls = h.lat_read & (h.lat_slots - 1)
-                self.latencies[int(lats[ls].slot)] = int(lats[ls].samples)
+                _slot = int(lats[ls].slot)
+                _samples = int(lats[ls].samples)
+                if _slot == 0xFFFFFFFE:
+                    # G3: processed - khong vao latencies dict (sum chain sai).
+                    self.processed = _samples
+                else:
+                    self.latencies[_slot] = _samples
                 h.lat_read += 1
         except Exception:
             pass
 
-
 # Registry toàn tiến trình (desktop app 1 user).
 _SESSIONS = {}
 _SESSIONS_LOCK = threading.Lock()