IMemInputPin::Receive method

The Receive method receives the next media sample in the stream.

Syntax

HRESULT Receive(
  IMediaSample *pSample
);

Parameters

pSample

Pointer to the sample's IMediaSample interface.

Return Value

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

Return code Description
S_OK
Success.
S_FALSE
The sample was rejected.
E_POINTER
NULL pointer argument.
VFW_E_INVALIDMEDIATYPE
Invalid media type.
VFW_E_RUNTIME_ERROR
A run-time error occurred.
VFW_E_WRONG_STATE
The pin is stopped.

Remarks

This method is synchronous and possibly blocking. The pin does one of the following:

  • Rejects the sample.
  • Returns immediately and processes the sample in a worker thread.
  • Processes the sample before returning.
In the last case, the method might block indefinitely. If this might happen, the IMemInputPin::ReceiveCanBlock method returns S_OK.

If the pin uses a worker thread to process the sample, it holds a reference count on the sample. In any case, the output pin cannot directly re-use this sample. It must call the IMemAllocator::GetBuffer method to obtain a new sample.

If this method returns S_FALSE or an error code, the upstream filter should stop sending samples until the graph stops or completes a flush operation. Typical reasons for an S_FALSE return value include:

  • The downstream pin is flushing; that is, it received a BeginFlush call and has not yet received an EndFlush call.
  • The downstream filter detected the end of the stream. (See End-of-Stream Notifications.)

Requirements

   
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)
Library Strmiids.lib

See Also

Error and Success Codes

IMemInputPin Interface