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ISpRecoResult::ScaleAudio

ISpRecoResult::ScaleAudio converts an existing audio stream into a different audio format.

HRESULT ScaleAudio(
  const GUID           *pAudioFormatId,
  const WAVEFORMATEX   *pWaveFormatEx
);

Parameters

pAudioFormatId

[in] Address of the data format identifier. Typically, this value is SPDFID_WaveFormatEx.

pWaveFormatEx

[in] Address of the WAVEFORMATEX structure that contains the audio format to convert to. This value must be NULL if pAudioFormatId is not specified as SPDFID_WaveForamtEx.

Return values

Remarks

Use the ISpPhrase::Discard method to completely discard audio data associated with a result object.

The application can also set the default retained audio format for the ISpRecoResult object by calling ISpRecoContext::SetAudioOptions. Calling ::SetAudioOptions will only apply to all subsequent recognitions, not the current ISpRecoResult object.

When performing a scaling with a compressed format, it is possible to introduce small rounding errors, since the content of the audio is not used to perform the conversion.

Scaling between certain compressed formats is not supported by the SAPI format converter (See the Remarks section for ISpStreamFormatConverter).

Example

The following code snippet illustrates the use ISpRecoResult::ScaleAudio to scale the audio to a low quality format before serialization to the disk (to save space).

    HRESULT hr = S_OK;

    // ... obtain a recognition result object from the recognizer...

    // create a format helper with a very low quality format 
    CSpStreamFormat ScaleFormat(SPSF_8kHz8BitMono, &hr);
    // Check hr

    hr = cpRecoResult->ScaleAudio(&(ScaleFormat.FormatId()), ScaleFormat.WaveFormatExPtr());
    // Check hr

    // get a result serialization pointer
    SPSERIALIZEDRESULT* pSerializedResult;

    // serialize the result
    hr = cpRecoResult->Serialize(&pSerializedResult);
    // Check hr

    // ... write pSerializedResult to the disk