|Microsoft DirectX 9.0|
The CPullPin class provides support for input pins that pull data through the IAsyncReader interface. Use this class if you are implementing a filter that uses the pull model to request data from the upstream filter. For more information, see Data Flow in the Filter Graph and Pull Model.
This class does not derive from CBasePin or implement the IPin interface, and some of the method names clash with IPin, so it is best used as a helper object inside your pin. To use this class, do the following:
Header: Include Pullpin.h and Streams.h.
Library: Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).
|Public Member Variables||Description|
|m_pAlloc||Pointer to the IMemAllocator interface of the memory allocator.|
|Active||Creates a worker thread that pulls data from the output pin.|
|AlignDown||Truncates a value to a specified alignment boundary.|
|AlignUp||Rounds a value up to a specified alignment boundary.|
|Connect||Completes a connection to the output pin.|
|~CPullPin||Destructor method. Virtual.|
|DecideAllocator||Negotiates an allocator with the output pin. Virtual.|
|Disconnect||Beaks the connection with the output pin.|
|Duration||Retrieves the duration of the stream.|
|GetReader||Returns a pointer to the output pin's IAsyncReader interface.|
|Inactive||Shuts down the worker thread that pulls data from the output pin.|
|Seek||Sets the start and stop positions of the stream.|
|Pure Virtual Methods|
|BeginFlush||Informs the owning filter to flush the downstream filters.|
|EndFlush||Informs the owning filter to end a flush operation.|
|EndOfStream||Called after the object delivers the last sample.|
|OnError||Called if an error occurs during streaming.|
|Receive||Called when the object receives a media sample from the output pin.|