METransformNeedInput event
Sent by an asynchronous Media Foundation transform (MFT) to request a new input sample.
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 needs input data. (Required) |
Remarks
Asynchronous MFTs send this event through the IMFMediaEventGenerator interface. Synchronous MFTs never send this event.
When the client of the MFT receives this event, it should call IMFTransform::ProcessInput to deliver the next sample. The MF_EVENT_MFT_INPUT_STREAM_ID attribute of the event object specifies which input stream requires data.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 7 [desktop apps only] |
| Minimum supported server |
Windows Server 2008 R2 [desktop apps only] |
| Header |
|
See also