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Sent by an asynchronous Media Foundation transform (MFT) when a drain operation is complete.
Event values
Possible values retrieved from IMFMediaEvent::GetValue include the following.
| VARTYPE | Description |
|---|---|
| VT_EMPTY |
No event data. |
Attributes
The following attributes are defined for this event.
| Attribute | Description |
|---|---|
| MF_EVENT_MFT_INPUT_STREAM_ID |
The identifier of the stream that was drained. (Required) |
Remarks
Asynchronous MFTs send this event through the IMFMediaEventGenerator interface. Synchronous MFTs never send this event.
To drain an MFT, call IMFTransform::ProcessMessage with the MFT_MESSAGE_COMMAND_DRAIN message. Specify the input stream to drain in the ulParam parameter. When the drain operation is completed, an asynchronous MFT sends the METransformDrainComplete event. The MF_EVENT_MFT_INPUT_STREAM_ID attribute of the event contains the stream identifier given in the ulParam parameter.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 7 [desktop apps only] |
| Minimum supported server |
Windows Server 2008 R2 [desktop apps only] |
| Header |
|
See also