fixes for proposed judge pipeline

src/pipecat/processors/filters/function_filter.py

@@ -11,19 +11,27 @@ from pipecat.processors.frame_processor import FrameDirection, FrameProcessor
 
 
 class FunctionFilter(FrameProcessor):
-    def __init__(self, filter: Callable[[Frame], Awaitable[bool]]):
+    def __init__(
+        self,
+        filter: Callable[[Frame], Awaitable[bool]],
+        direction: FrameDirection = FrameDirection.DOWNSTREAM,
+    ):
         super().__init__()
         self._filter = filter
+        self._direction = direction
 
     #
     # Frame processor
     #
 
-    def _should_passthrough_frame(self, frame):
-        return isinstance(frame, SystemFrame)
+    # Ignore system frames and frames that are not following the direction of this gate
+    def _should_passthrough_frame(self, frame, direction):
+        return isinstance(frame, SystemFrame) or direction != self._direction
 
     async def process_frame(self, frame: Frame, direction: FrameDirection):
-        passthrough = self._should_passthrough_frame(frame)
+        await super().process_frame(frame, direction)
+
+        passthrough = self._should_passthrough_frame(frame, direction)
         allowed = await self._filter(frame)
         if passthrough or allowed:
             await self.push_frame(frame, direction)