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CBaseOutputPin::Deliver

  • Artículo
 
Microsoft DirectShow 9.0

CBaseOutputPin::Deliver

The Deliver method delivers a media sample to the connected input pin.

Syntax

  virtual HRESULT Deliver(
    IMediaSample *pSample
);

Parameters

pSample

Pointer to the sample's IMediaSample interface.

Return Value

Returns an HRESULT value. Possible values include those listed in the following table.

Value Description
S_OK Success.
VFW_E_NOT_CONNECTED Pin is not connected.

Remarks

This method calls the IMemInputPin::Receive method on the input pin. Receive can block if the IMemInputPin::ReceiveCanBlock method returns S_OK.

Release the sample after calling this method. The input pin might hold a reference count on the sample, so do not reuse the sample. Always call the CBaseOutputPin::GetDeliveryBuffer method to obtain a new sample.

Hold the filter's critical section before calling this method. Otherwise, the pin might get disconnected during the method call. If the filter uses a worker thread to deliver samples, hold the critical section when the filter is ready to deliver a sample. Otherwise, you can hold the critical section in the filter's IMemInputPin::Receive method, where the filter processes samples.

Worker threads can create a potential deadlock. When the thread holds the critical section, it might wait on a state change in the filter. At the same time, the state change might be waiting for the thread to complete. To prevent this, the state-change code should signal an event that terminates the thread, and then wait for the thread to signal completion.

Requirements

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

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

See Also