IAudioStreamVolume::GetChannelCount Method

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

Syntax

public:
HRESULT GetChannelCount(
         UINT32 *pdwCount
)

pdwCount
Type: UINT32 *

[out]

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

Type: HRESULT

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.

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

Header: Declared in audioclient.h.

Library: Use mmdevapi.lib.