IMemInputPin::NotifyAllocator method (strmif.h)

The NotifyAllocator method specifies an allocator for the connection.


HRESULT NotifyAllocator(
  [in]  IMemAllocator *pAllocator,
  [out] BOOL          bReadOnly


[in] pAllocator

Pointer to the allocator's IMemAllocator interface.

[out] bReadOnly

Flag that specifies whether samples from this allocator are read-only. If TRUE, samples are read-only.

Return value

Returns S_OK if successful, or an HRESULT value indicating the cause of the error.


During the pin connection, the output pin chooses an allocator and calls this method to notify the input pin. The output pin might use the allocator that the input pin proposed in the IMemInputPin::GetAllocator method, or it might provide its own allocator.

If the bReadOnly parameter is TRUE, all samples in the allocator are read-only. The filter must copy them to modify the data.


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)
Library Strmiids.lib

See also

Error and Success Codes

IMemInputPin Interface