fix(render): VSTi export lay preset dung bridge channel (midi_channel, khong phai track.id)

render_session_container da tinh midi_channel round-robin melodic giong unifiedMidiRouter.allocateChannel, nhung VSTi branch truyen track.id vao bridge_state_preset_b64 -> lay preset cua channel stale (VD track5 -> ch5 trong khi realtime choi ch2) -> export sai loai nhac cu. Dung midi_channel.
2026-08-25 21:33:33 +07:00
parent 57fa2e78fe
commit 26086cb331
2 changed files with 11 additions and 4 deletions
@@ -716,8 +716,14 @@ class PythonRenderEngine:
                                        preset_b64 = (se2.get("preset_data")
                                                      or track.get("preset_data"))
                                        if not preset_b64:
+                                            # BUG v6: channel phải là midi_channel
+                                            # (round-robin melodic — giống
+                                            # unifiedMidiRouter.allocateChannel),
+                                            # KHÔNG phải track.id → trước đây lấy
+                                            # preset của channel stale (sai loại
+                                            # nhạc cụ khi realtime chơi channel khác).
                                            preset_b64 = native_render.bridge_state_preset_b64(
-                                                channel=track.get("id"),
+                                                channel=midi_channel,
                                                plugin_path=(se2.get("plugin_path")
                                                             or track.get("plugin_path")),
                                            )