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CPullPin Class

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This class is provided to allow a filter downstream from the source to create a thread and pull a media stream from an asynchronous source filter that supports the IAsyncReader interface. Typically this class is implemented on the input pin of a parser filter, because the DirectShow asynchronous reader filter just reads a media stream from a file and provides no parsing.

Protected Data Members

Member Description
m_pAlloc Pointer to the IMemAllocator interface used by the connection.

Member Functions

Member function Description
Active Instructs the pin to start pulling data from the asynchronous reader.
AlignDown Aligns a LONGLONG value down to the next LONG boundary.
AlignUp Aligns a LONGLONG value up to the next LONG boundary.
Connect Initiates a connection from this pin to the asynchronous reader.
CPullPin Constructs a CPullPin object.
Disconnect Breaks a connection to the asynchronous reader.
Duration Retrieves the total duration of the media stream.
GetReader Retrieves the asynchronous reader interface.
Inactive Instructs the pin to stop pulling data from the asynchronous reader.
Seek Sets the start and stop times of the media stream.

Overrideable Member Functions

Member function Description
BeginFlush Flushes this pin and all downstream pins.
DecideAllocator Proposes an allocator for use by the asynchronous reader.
EndFlush Signals end of flushing operation.
EndOfStream Sends end-of-stream notification downstream.
OnError Handles run-time errors that caused pulling to stop.
Receive Handles the arrival of data from the asynchronous reader.

Requirements

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
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Last updated on Wednesday, April 13, 2005

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