Gap 8: PDC realtime — WS latency push + dry-path delay compensation

Backend: /ws/fx-realtime pump drain get_latencies (SHM ring, bridge da bao REPORT_LATENCY) -> push {cmd:'latency',total,latencies} khi tong doi. Frontend: pdcDelay (DelayNode) giua dryOutput->output bu delay master chain (round-trip 2 block + latency VST3), fxRtApplyPdc cap nhat tu WS frame, reset khi chain off. Test test_63 fake session 1024 -> frame total 1024; full 175 passed.
2026-08-23 08:44:54 +07:00
parent db12698ba2
commit 6b2c9a039b
5 changed files with 110 additions and 8 deletions
@@ -1064,8 +1064,24 @@ async def ws_fx_realtime(websocket: WebSocket, session_id: str):
        # output theo burst khi nhận input dồn; bắn toàn bộ cùng lúc → worklet
        # overflow drop block cũ nhất → âm ngắt quãng.
        block_sec = (sess.block_size or 256) / max(int(sess.sample_rate or 44100), 1)
+        # Gap 8 (PDC realtime): drain latency chain tu SHM ring (bridge bao qua
+        # REPORT_LATENCY per-slot) -> push text frame khi tong doi. Client dung
+        # de bu delay dry-bypass path (app.jsx fxRtApplyPdc).
+        _last_lat = None
        try:
            while True:
+                try:
+                    _lats = sess.get_latencies()
+                    _total = sum(_lats.values()) if _lats else 0
+                    if _total != _last_lat:
+                        _last_lat = _total
+                        await websocket.send_text(json.dumps({
+                            "cmd": "latency",
+                            "total": _total,
+                            "latencies": _lats,
+                        }))
+                except Exception:
+                    pass
                blks = sess.read_output()
                if not blks:
                    await asyncio.sleep(0.002)