|Microsoft DirectX 9.0|
The BeginFlush method begins a flush operation.
Applications should not call this method. This method is called by other filters, to flush data from the graph.
Returns an HRESULT value. Possible values include the following.
|E_UNEXPECTED||The pin is an output pin.|
Call this method only on input pins. Output pins return E_UNEXPECTED.
In a flush operation, a filter discards whatever data it was processing. It rejects new data until the flush is completed. The flush is completed when the upstream pin calls the IPin::EndFlush method. Flushing enables the filter graph to be more responsive when events alter the normal data flow. For example, flushing occurs during a seek.
When BeginFlush is called, the filter performs the following steps:
When the BeginFlush notification reaches a renderer filter, the renderer frees any samples that it holds.
After BeginFlush is called, the pin rejects all samples from upstream, with a return value of S_FALSE, until the IPin::EndFlush method is called.