MFCreateDeviceSource function (mfidl.h)
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.
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 |