Values:
SPEECH_EVENT_TYPE_UNSPECIFIED (0):
No speech event specified.
END_OF_SINGLE_UTTERANCE (1):
This event indicates that the server has detected the end of
the user's speech utterance and expects no additional
speech. Therefore, the server will not process additional
audio and will close the gRPC bidirectional stream. This
event is only sent if there was a force cutoff due to
silence being detected early. This event is only available
through the latest_shortmodel.
SPEECH_ACTIVITY_BEGIN (2):
This event indicates that the server has detected the
beginning of human voice activity in the stream. This event
can be returned multiple times if speech starts and stops
repeatedly throughout the stream. This event is only sent if
voice_activity_events is set to true.
SPEECH_ACTIVITY_END (3):
This event indicates that the server has detected the end of
human voice activity in the stream. This event can be
returned multiple times if speech starts and stops
repeatedly throughout the stream. This event is only sent if
voice_activity_events is set to true.