Store the audio data from the recognition into file

In a real world speech application, one might need to store the audio data from a recognition, to check after that if what the user said is the same as what the application recognized.

It's pretty easy to do this using just SAPI objects (no other external goop).

Apparently one can get the audio data just in case of a successful recognition.

From the point of view of the code, one should put the following code in the SPEI_RECOGNITION case from the previous post, and then one could use this functionality.

CComPtr pSpVoice;

//create a TTS object

hr = pSpVoice.CoCreateInstance(CLSID_SpVoice);

//check hr

CSpStreamFormat cAudioFmt;

hr = cAudioFmt.AssignFormat(SPSF_11kHz16BitMono);

//check hr

CComPtr pSpStream;

hr = SPBindToFile("D:\temp.wav" ,  SPFM_CREATE_ALWAYS, &pSpStream, &cAudioFmt.FormatId(),cAudioFmt.WaveFormatExPtr() );

//check hr

//set TTS output to wav file

hr = pSpVoice->SetOutput( pSpStream, TRUE );

//check hr

SPPHRASE* pPhrase   = 0;

//get a phrase object (this contains audio data) 

hr = pRecoResult->GetPhrase(&pPhrase);

//check hr

//get audio

hr = pRecoResult->GetAudio(0, pPhrase->Rule.ulCountOfElements, &pStreamFormat);

//check hr

//speak audio data to file

hr = pSpVoice->SpeakStream(pStreamFormat, SPF_DEFAULT, NULL);

//check hr

//clean up

pSpStream->Close();

pSpStream.Release();

pSpVoice.Release();

Have fun!