CPullPin::DecideAllocator

The DecideAllocator method negotiates an allocator with the output pin.

Syntax

virtual HRESULT DecideAllocator(
    IMemAllocator *pAlloc,
    ALLOCATOR_PROPERTIES *pProps
);

Parameters

pAlloc

Pointer to the IMemAllocator interface of the input pin's preferred allocator, or NULL.

pProps

Pointer to an optional ALLOCATOR_PROPERTIES structure that contains the input pin's buffer requirements. 

Return Values

Returns S_OK if successful, or an error code otherwise.

Remarks

This method calls the IAsyncReader::RequestAllocator method to negotiate an allocator. It passes the pAlloc parameter directly to the RequestAllocator method. It passes the pProps parameter to RequestAllocator if pProps is non-NULL; otherwise, it creates an ALLOCATOR_PROPERTIES structure with a default request of three 64K buffers.

See Also

• CPullPin Class
• CPullPin::Connect