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IMFMediaSession::SetTopology method (mfidl.h)

  • Article

Sets a topology on the Media Session.

Syntax

HRESULT SetTopology(
  [in] DWORD       dwSetTopologyFlags,
  [in] IMFTopology *pTopology
);

Parameters

[in] dwSetTopologyFlags

Bitwise OR of zero or more flags from the MFSESSION_SETTOPOLOGY_FLAGS enumeration.

[in] pTopology

Pointer to the topology object's IMFTopology interface.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code Description
S_OK
 The method succeeded.
MF_E_INVALIDREQUEST
 The operation cannot be performed in the Media Session's current state.
MF_E_SHUTDOWN
 The Media Session has been shut down.
MF_E_TOPO_INVALID_TIME_ATTRIBUTES
 The topology has invalid values for one or more of the following attributes:
NS_E_DRM_DEBUGGING_NOT_ALLOWED
 Protected content cannot be played while debugging.

Remarks

If pTopology is a full topology, set the MFSESSION_SETTOPOLOGY_NORESOLUTION flag in the dwSetTopologyFlags parameter. Otherwise, the topology is assumed to be a partial topology. The Media Session uses the topology loader to resolve a partial topology into a full topology.

If the Media Session is currently paused or stopped, the SetTopology method does not take effect until the next call to IMFMediaSession::Start.

If the Media Session is currently running, or on the next call to Start, the SetTopology method does the following:

  • If the MFSESSION_SETTOPOLOGY_IMMEDIATE flag is set in dwSetTopologyFlags, the Media Session ends the current presentation immediately, clears all pending topologies, and uses pTopology to start a new presentation.
  • Otherwise, the Media Session queues pTopology and starts the new presentation when the current presentation has completed. If there is no current presentation, the new presentation starts immediately.
  • Starting in Windows 7, you can also specify the MFSESSION_SETTOPOLOGY_CLEAR_CURRENT flag to clear the current topology but leave any other pending topologies on the queue.
This method is asynchronous. If the method returns S_OK, the Media Session sends an MESessionTopologySet event when the operation completes. If the Media Session is currently paused to stopped, the Media Session does not send the MESessionTopologySet event until the next call to IMFMediaSession::Start

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

See also

IMFMediaSession