CTransformOutputPin.DecideBufferSize method
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The DecideBufferSize method sets the buffer requirements.
Syntax
HRESULT DecideBufferSize(
IMemAllocator *pAlloc,
ALLOCATOR_PROPERTIES *ppropInputRequest
);
Parameters
-
pAlloc
-
Pointer to the allocator's IMemAllocator interface.
-
ppropInputRequest
-
Pointer an ALLOCATOR_PROPERTIES structure that contains the input pin's buffer requirements.
Return value
Returns an HRESULT value.
Remarks
This method overrides the CBaseOutputPin::DecideBufferSize method. It calls the filter's pure virtual CTransformFilter::DecideBufferSize method, which the filter's derived class must implement.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
|