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ISpRecoResult::GetAudio (SAPI 5.3)

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Microsoft Speech API 5.3

ISpRecoResult::GetAudio

ISpRecoResult::GetAudio creates an audio stream of the requested words from the audio data in the result object.

  
    HRESULT GetAudio(
   ULONG              ulStartElement,
   ULONG              cElements,
ISpStreamFormat  **ppStream
);

Parameters

  • ulStartElement
    [in] Value specifying from which element in the result data to start the audio stream.
  • cElements
    [in] Value specifying the total number of words.
  • ppStream
    [out] Address that will receive a pointer to an ISpStreamFormat object containing the audio data requested.

Return values

Value
S_OK
E_INVALIDARG
E_POINTER
SPERR_NO_AUDIO_DATA
FAILED(hr)

Remarks

Even if there are no elements, that is, ulStartElement = 0 and cElements = 0, the audio will still be played. There are "unrecognized" results that have no elements but have audio.

An application can find the time offsets for each element by examining the SPPHRASE object retrieved using ISpRecoResult::GetPhrase.

Example

The following code snippet illustrates the use ISpRecoResult::GetAudio to retrieve the retained audio.

  
// Declare local identifiers:
HRESULT                       hr = S_OK;
CComPtr<ISpRecoResult>        cpRecoResult;
CComPtr<ISpStreamFormat>      cpStreamFormat;
GUID                          formatId;
WAVEFORMATEX                  *pWaveFormatEx;

// ... Obtain a recognition result object from the recognizer ...
hr = cpRecoResult->GetAudio(0, 0, &cpStreamFormat;);

if (SUCCEEDED(hr))
{
   // Check the format of the stream.
   hr = cpStreamFormat->GetFormat(&formatId;, &pWaveFormatEx;);
}

if (SUCCEEDED(hr))
{
   // Do stuff here.
}