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Retrieves a stream's current state.
enum StreamControlState CheckStreamState( IMediaSample * pSample );
Parameters
- pSample
- Pointer to an
IMediaSampleinterface.
Return Values
Returns a StreamControlStateenumeration type.
Remarks
Your filter calls this member function when your pin receives a sample that it is about to forward. The first sample you forward after throwing one or more away should be marked as a discontinuity.
The following example shows what you should include if your filter inherits from CBaseStreamControl.
//Pin has been given a sample to pass on, pSample //m_fLastSampleDiscarded is initialized to TRUE when streaming starts int iStreamState = CheckStreamState(pSample); if (iStreamState == STREAM_FLOWING) { if (m_fLastSampleDiscarded) pSample->SetDiscontinuity(TRUE); m_fLastSampleDiscarded = FALSE; //now deliver it or put it o a queue to be delivered, or whatever. } else { m_fLastSampleDiscarded = TRUE; //next one is discontinuity //Do NOT deliver this sample. Just throw it away. }