IChannelAudioVolume::GetChannelCount
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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
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