Streaming Callback Function

typedef void (*LV_SRE_StreamStateChangeFn)(long NewState, unsigned long TotalBytes, unsigned long RecordedBytes, void* UserData)

The callback function is called by the speech port each time a stream status changes. Primarily this is used with streams performing barge-in detection and/or end-of-speech detection to notify hardware to stop playing a prompt (barge-in) or to stop recording a user (end-of-speech).

Parameters

NewState

New state of stream.  See Stream Status.

TotalBytes

Total bytes streamed (at point of stream status change), more sound data may still be in the internal unprocessed queue.

RecordedBytes

Total bytes minus data discarded before barge-in was detected.

UserData

Pointer to application defined data.

Remarks

Note that only a limited number functions are available from within the streaming callback, as using any functions that alter the stream is disallowed. The only allowed functions are:

• LV_SRE_StreamSendData / LVSpeechPort::StreamSendData

• LV_SRE_StreamGetStatus / LVSpeechPort::StreamGetStatus

• LV_SRE_ReturnErrorString / LVSpeechPort::ReturnErrorString

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