IChannelAudioVolume::GetChannelCount

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

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 session before calling any of the other methods in the IChannelAudioVolume interface.

Requirements

Client: Windows Vista

Header: Include Audioclient.h.

See Also

Additional resources