This method retrieves the current reference clock in use by this filter.

HRESULT GetSyncSource(
  IReferenceClock** pClock


  • pClock
    [out] Pointer to a reference clock; it will be set to the IReferenceClock interface.

Return Values

Returns an HRESULT value that depends on the implementation. HRESULT can be one of the following standard constants, or other values not listed.

Value Description
E_FAIL Failure.
E_POINTER Null pointer argument.
E_INVALIDARG Invalid argument.
E_NOTIMPL Method is not supported.
S_OK or NOERROR Success.


The returned interface (if it is non-NULL) will have a reference added by the IUnknown::AddRef method. The calling application should release the interface by calling the IUnknown::Release method when it has finished with the pointer.


DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.

See Also

IMediaFilter Interface

Last updated on Wednesday, April 13, 2005

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