CBaseInputPin Class

Article
06/30/2006

This is an abstract base class derived from CBasePin that adds support for IMemInputPin in addition to the IPin interface support provided by CBasePin. Its IMemInputPin::GetAllocator method returns a CMemAllocator object. Derive your input pin from this class.

All member functions in this class that return HRESULT and accept a pointer as a parameter return E_POINTER when passed a null pointer.

Protected Data Members

Member	Description
m_bFlushing	In the state of flushing; if TRUE, all IMemInputPin::Receive methods are returned with S_FALSE.
m_bReadOnly	If TRUE, indicates that the allocator being used contains samples that are read-only.
m_pAllocator	Pointer to the default memory allocator.

Member Functions

Member function	Description
CBaseInputPin	Constructs a CBaseInputPin object.
IsReadOnly	Checks the m_bReadOnly data member and returns its value.
IsFlushing	Checks the m_bFlushing data member and returns its value.
PassNotify	Passes a quality-control notification to the appropriate sink.

Overrideable Member Functions

Member function	Description
CheckStreaming	Verifies conditions for continuing with a streaming operation.
Inactive	Switches the pin to an inactive state.

Implemented IPin Methods

Method	Description
BeginFlush	Informs the pin to begin a flush operation.
Disconnect	Releases the stored allocator.
EndFlush	Informs the pin to end a flush operation.

Implemented IMemInputPin Methods

Method	Description
GetAllocator	Returns the allocator interface that this input pin would like the output pin to use.
GetAllocatorRequirements	Indicates an optional method to use if the filter has specific alignment or prefix requirements but could use an upstream allocator.
NotifyAllocator	Tells the input pin which allocator the output pin is actually going to use.
Receive	Returns the next block of data from the stream. (Override this method to process a sample being passed in.)
ReceiveCanBlock	Determines if sending an IMemInputPin::Receive method might block.
ReceiveMultiple	Returns the next block of data from the stream. (Override this method to process samples being passed in.)

Implemented INonDelegatingUnknown Methods

Method	Description
NonDelegatingQueryInterface	Retrieves an interface from the subobject, not the aggregated object.

Implemented IQualityControl Methods

Method	Description
Notify	Notifies the recipient that a quality-control change is requested. (Override on the output pin only. This implementation returns NOERROR.)

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.
Header:

Last updated on Wednesday, April 13, 2005

Partager via