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feat(aws): add speaker diarization support to STT #4151

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feat(aws): add speaker diarization support to STT #4151

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17 changes: 16 additions & 1 deletion livekit-plugins/livekit-plugins-aws/livekit/plugins/aws/stt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -101,7 +101,15 @@ def __init__(
language_model_name: NotGivenOr[str] = NOT_GIVEN,
credentials: NotGivenOr[Credentials] = NOT_GIVEN,
):
super().__init__(capabilities=stt.STTCapabilities(streaming=True, interim_results=True))
# Enable diarization capability if show_speaker_label is enabled
diarization_enabled = is_given(show_speaker_label) and show_speaker_label
super().__init__(
capabilities=stt.STTCapabilities(
streaming=True,
interim_results=True,
diarization=diarization_enabled,
)
)

if not _AWS_SDK_AVAILABLE:
raise ImportError(
Expand Down Expand Up @@ -317,13 +325,20 @@ def _process_transcript_event(self, transcript_event: TranscriptEvent) -> None:

def _streaming_recognize_response_to_speech_data(self, resp: Result) -> stt.SpeechData:
confidence = 0.0
speaker_id = None

if resp.alternatives and (items := resp.alternatives[0].items):
confidence = items[0].confidence or 0.0
# Extract speaker_id from the first item if available
# AWS Transcribe returns speaker labels like "spk_0", "spk_1", etc.
if items[0].speaker:
speaker_id = items[0].speaker

return stt.SpeechData(
language=resp.language_code or self._opts.language,
start_time=resp.start_time if resp.start_time is not None else 0.0,
end_time=resp.end_time if resp.end_time is not None else 0.0,
text=resp.alternatives[0].transcript if resp.alternatives else "",
confidence=confidence,
speaker_id=speaker_id,
)
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