IMFSequencerSource::AppendTopology method (mfidl.h)
Adds a topology to the end of the queue.
Syntax
HRESULT AppendTopology(
[in] IMFTopology *pTopology,
[in] DWORD dwFlags,
[out] MFSequencerElementId *pdwId
);
Parameters
[in] pTopology
Pointer to the IMFTopology interface of the topology. This pointer cannot be NULL. If an application passes NULL, the call fails with an E_INVALIDARG error code.
[in] dwFlags
A combination of flags from the MFSequencerTopologyFlags enumeration.
[out] pdwId
Receives the sequencer element identifier for this topology.
Return value
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Return code | Description |
|---|---|
|
The method succeeded. |
|
The source topology node is missing one of the following attributes: |
Remarks
The sequencer plays topologies in the order they are queued. You can queue as many topologies as you want to preroll.
The application must indicate to the sequencer when it has queued the last topology on the Media Session. To specify the last topology, set the SequencerTopologyFlags_Last flag in the dwFlags parameter when you append the topology. The sequencer uses this information to end playback with the pipeline. Otherwise, the sequencer waits indefinitely for a new topology to be queued.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista [desktop apps only] |
| Minimum supported server | Windows Server 2008 [desktop apps only] |
| Target Platform | Windows |
| Header | mfidl.h |
| Library | Mfuuid.lib |