COM Objects > CoreAudioDevices object > Methods > CoreAudioDevices.ChannelCountGet method

Remarks

After having enumerated the list of available audio endpoint devices through the CoreAudioDevices.Enum method, obtains the number of channels for a specific audio endpoint device having a specific data flow (playback or recording).

This method is only intended for usage with Windows Vista and later versions: further information about management of audio devices in Windows Vista and later versions can be found inside the How to access settings of audio devices in Windows Vista and later versions tutorial.

For further details about methods related to the management of core audio devices refer to the CoreAudioDevices COM object.

Syntax

[Visual Basic]

control.CoreAudioDevices.ChannelCountGet (

nDataFlow as enumCoreAudioDataFlows,

nDeviceIndex as Integer,

nChannelsCount as Integer

) as enumErrorCodes

[C++]

short control.CoreAudioDevices.ChannelCountGet (

short nDataFlow,

short nDeviceIndex,

short *nChannelsCount

);

Parameter

Description

nDataFlow

Direction in which audio data flows between an audio endpoint device and an application.

Supported values are the following:

Mnemonic Value	Value	Meaning
DEVICE_DATA_FLOW_RENDER	0	Audio rendering stream. Audio data flows from the application to the audio endpoint device, which renders the stream
DEVICE_DATA_FLOW_CAPTURE	1	Audio capture stream. Audio data flows from the audio endpoint device that captures the stream, to the application.

nDeviceIndex

Zero-based index of the audio endpoint device. The total number of audio endpoint devices can be obtained through the CoreAudioDevices.CountGet method.

nChannelsCount

Reference that, on return from the method call, will contain the number of channels for the given audio endpoint device.

Return value

Value	Meaning

Negative value	An error occurred, check the LastError property value in order to get the error code
enumErrorCodes.ERR_NOERROR (0)	The method call was successful