added BotSpeakingFrame

src/pipecat/frames/frames.py

@@ -240,6 +240,17 @@ class StopInterruptionFrame(SystemFrame):
     pass
 
 
+@dataclass
+class BotSpeakingFrame(SystemFrame):
+    """Emitted by transport outputs while the bot is still speaking. This can be
+    used, for example, to detect when a user is idle. That is, while the bot is
+    speaking we don't want to trigger any user idle timeout since the user might
+    be listening.
+
+    """
+    pass
+
+
 @dataclass
 class MetricsFrame(SystemFrame):
     """Emitted by processor that can compute metrics like latencies.