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IVideoFrameStep::CanStep

  • Artigo
 
Microsoft DirectShow 9.0

IVideoFrameStep::CanStep

The CanStep method determines the stepping capabilities of the specified filter.

Syntax

  HRESULT CanStep(
  long bMultiple,
  IUnknown *pStepObject
);

Parameters

bMultiple

If bMultiple is zero and the method returns S_OK, the graph can step one frame at a time. If bMultiple if greater than zero and the method returns S_OK, the graph can step bMultiple frames at a time.

pStepObject

Pointer to an interface on the filter that will control the stepping operation. Specify NULL to perform frame stepping using the renderer filter in the graph. If the graph includes a custom filter that implements the frame stepping, then pStepObject should specify that filter's IBaseFilter interface.

Return Values

Returns S_OK if the object can step or E_INVALIDARG if pStepObject is invalid.

Requirements

Header: Declared in Strmif.h; include Dshow.h.

Library: Use Strmiids.lib.

See Also