MFCreateDeviceSource function (mfidl.h)

2021-10-13

Creates a media source for a hardware capture device.

Syntax

HRESULT MFCreateDeviceSource(
  [in]  IMFAttributes  *pAttributes,
  [out] IMFMediaSource **ppSource
);

Parameters

[in] pAttributes

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

[out] ppSource

Receives a pointer to the media source's IMFMediaSource interface. The caller must release the interface.

Return value

If this function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

Important When the capture device is no longer needed, you must shut down the device by calling Shutdown on the IMFMediaSource object you obtained by calling MFCreateDeviceSource. Failure to call Shutdown can result in memory links because the system may keep a reference to IMFMediaSource resources until Shutdown is called.

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:

Attribute	Description
MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_ENDPOINT_ID	Specifies the audio endpoint ID of the audio capture device.
MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_ROLE	Specifies the device role. If this attribute is set, the function uses the default audio capture device for that device role. Do not combine this attribute with the MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_ENDPOINT_ID attribute.

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:

Attribute	Description
MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_SYMBOLIC_LINK	Specifies the symbolic link to the device.

Requirements

Requirement	Value
Minimum supported client	Windows 7 [desktop apps only]
Minimum supported server	Windows Server 2008 R2 [desktop apps only]
Target Platform	Windows
Header	mfidl.h
Library	Mf.lib
DLL	Mf.dll

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