MFCreateDeviceSourceActivate function (mfidl.h)

Creates an activation object that represents a hardware capture device.

Syntax

HRESULT MFCreateDeviceSourceActivate(
  [in]  IMFAttributes *pAttributes,
  [out] IMFActivate   **ppActivate
);

Parameters

[in] pAttributes

Pointer to the IMFAttributes interface of an attribute store, which is used to select the device. See Remarks.

[out] ppActivate

Receives a pointer to the IMFActivate interface. The caller must release the interface.

Return value

None

Remarks

This function creates an activation object that can be used to create a media source for a hardware device. To create the media source itself, call IMFActivate::ActivateObject.

The pAttributes parameter specifies an attribute store. To create the attribute store, call the MFCreateAttributes function. You must set the MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE attribute, which specifies the type of device (audio or video).

For audio capture devices, optionally set one of the following attributes:

If neither attribute is specified, the function selects the default audio capture device for the eCommunications role.

For video capture devices, you must set the following attribute:

Requirements

See also

Activation Objects

Audio/Video Capture in Media Foundation

Capture Device Attributes

MFCreateDeviceSource

Media Foundation Functions