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EDataFlow enumeration (mmdeviceapi.h)

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The EDataFlow enumeration defines constants that indicate the direction in which audio data flows between an audio endpoint device and an application.

Syntax

typedef enum __MIDL___MIDL_itf_mmdeviceapi_0000_0000_0001 {
  eRender = 0,
  eCapture,
  eAll,
  EDataFlow_enum_count
} EDataFlow;

Constants

 
eRender
Value: 0
Audio rendering stream. Audio data flows from the application to the audio endpoint device, which renders the stream.
eCapture
Audio capture stream. Audio data flows from the audio endpoint device that captures the stream, to the application.
eAll
Audio rendering or capture stream. Audio data can flow either from the application to the audio endpoint device, or from the audio endpoint device to the application.
EDataFlow_enum_count
The number of members in the EDataFlow enumeration (not counting the EDataFlow_enum_count member).

Remarks

The IMMDeviceEnumerator::GetDefaultAudioEndpoint, IMMDeviceEnumerator::EnumAudioEndpoints, IMMEndpoint::GetDataFlow, and IMMNotificationClient::OnDefaultDeviceChanged methods use the constants defined in the EDataFlow enumeration.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Header mmdeviceapi.h

See also

Core Audio Enumerations

IMMDeviceEnumerator::EnumAudioEndpoints

IMMDeviceEnumerator::GetDefaultAudioEndpoint

IMMEndpoint::GetDataFlow

IMMNotificationClient::OnDefaultDeviceChanged