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Blocks until the next read requested through IAsyncReader::Requestcompletes or the time-out occurs.
HRESULT WaitForNext( DWORD dwTimeout , IMediaSample ** ppSample , DWORD * pdwUser );
Parameters
- dwTimeout
- [in] Time-out in milliseconds; can be zero or INFINITE.
- ppSample
- [out] Completed sample.
- pdwUser
- User context.
Return Values
Returns an HRESULTvalue that depends on the implementation of the interface. Current DirectShow implementation return values include:
Value Description VFW_E_TIMEOUT A time-out has expired. VFW_E_WRONG_STATE The operation could not be performed because the filter is in the wrong state. E_FAIL Failure. S_OK Success. Remarks
Samples may not be returned in order. If there is a read error of any sort, a notification will already have been sent by the source filter, and HRESULTwill be an error. If ppSampleis not null, a request has been completed with the result code returned.
The pdwUserparameter returns the caller's context DWORDcorresponding to the sample returned.