first cut

backend/gradio_webrtc/webrtc.py

@@ -11,6 +11,7 @@ import traceback
 from abc import ABC, abstractmethod
 from collections.abc import Callable
 from typing import TYPE_CHECKING, Any, Generator, Literal, Sequence, cast
+from copy import deepcopy
 
 import anyio.to_thread
 import av
@@ -117,6 +118,12 @@ class StreamHandler(ABC):
         self.output_frame_size = output_frame_size
         self._resampler = None
 
+    def copy(self) -> "StreamHandler":
+        try:
+            return deepcopy(self)
+        except Exception:
+            raise ValueError("Current StreamHandler implementation cannot be deepcopied. Implement the copy method.")
+
     def resample(self, frame: AudioFrame) -> Generator[AudioFrame, None, None]:
         if self._resampler is None:
             self._resampler = av.AudioResampler(  # type: ignore
@@ -622,7 +629,7 @@ class WebRTC(Component):
             elif self.modality == "audio":
                 cb = AudioCallback(
                     relay.subscribe(track),
-                    event_handler=cast(StreamHandler, self.event_handler),
+                    event_handler=cast(StreamHandler, self.event_handler).copy(),
                 )
             self.connections[body["webrtc_id"]] = cb
             logger.debug("Adding track to peer connection %s", cb)