CBaseInputPin Class
.gif)
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
© 2005 Microsoft Corporation. All rights reserved.