Microsoft Speech Platform

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ISpAudio::GetDefaultFormat

ISpAudio::GetDefaultFormat passes back the default audio format.

HRESULT GetDefaultFormat(
   GUID            *pFormatId,
   WAVEFORMATEX   **ppCoMemWaveFormatEx
);

Parameters

pFormatId

[out] Pointer to the GUID of the default format.

ppCoMemWaveFormatEx

[out] Address of a pointer to the WAVEFORMATEX structure that receives the wave file format information. SAPI allocates the memory for the WAVEFORMATEX data structure using CoTaskMemAlloc, but it is the caller's responsibility to call CoTaskMemFree on the returned WAVEFORMATEX pointer.

Return values

Value	Description
S_OK	Function completed successfully.
SPERR_UNINITIALIZED	Stream is uninitialized.
E_POINTER	pFormatId is invalid.

Remarks

Other formats may be supported by the audio device; however, this format is guaranteed to work. Older sound cards can potentially fail when attempting to use this format if they are not fully duplex or do not support full duplex operation at different frequencies. An application should attempt to degrade gracefully when this occurs.