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CTransformFilter::Receive

  • Articolo
 
Microsoft DirectShow 9.0

CTransformFilter::Receive

The Receive method receives a media sample, processes it, and delivers an output sample to the downstream filter.

Syntax

  HRESULT Receive(
    IMediaSample *pSample
);

Parameters

pSample

Pointer to the IMediaSample interface on the input sample.

Return Value

Returns an HRESULT value. Possible values include the following:

Value Description
S_FALSE The upstream filter should stop sending samples.
S_OK Success.

Remarks

The filter's input pin calls this method when it receives a sample. This method calls the CTransformFilter::InitializeOutputSample method, which prepares a new output sample. Then it calls the CTransformFilter::Transform method, which the derived class must implement. The Transform method processes the input data and produces output data.

If the Transform method returns S_FALSE, the Receive method drops this sample. On the first dropped sample, the filter sends an EC_QUALITY_CHANGE event to the filter graph manager. Otherwise, if the Transform method returns S_OK, the filter delivers the output sample. To do so, it calls the IMemInputPin::Receive method on the downstream input pin.

Requirements

**  Header:** Declared in Transfrm.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

See Also