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IAudioStreamVolume::GetChannelCount

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IAudioStreamVolume::GetChannelCount

The GetChannelCount method retrieves the number of channels in the audio stream.

HRESULT GetChannelCount(
  UINT32  *pdwCount
);

Parameters

pdwCount

[out]  Pointer to a UINT32 variable into which the method writes the channel count.

Return Value

If the method succeeds, it returns S_OK. If it fails, possible return codes include, but are not limited to, the values shown in the following table.

Return code Description
E_POINTER Parameter pdwCount is NULL.
AUDCLNT_E_DEVICE_INVALIDATED The audio endpoint device has been unplugged, or the audio hardware or associated hardware resources have been reconfigured, disabled, removed, or otherwise made unavailable for use.
AUDCLNT_E_SERVICE_NOT_RUNNING The Windows audio service is not running.

Remarks

Call this method to get the number of channels in the audio stream before calling any of the other methods in the IAudioStreamVolume interface.

Requirements

Client: Windows Vista

Header: Include Audioclient.h.

See Also

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